Insulating battery shell and battery

Abstract

The utility model relates to the technical field of batteries, in particular to an insulating battery shell which comprises a shell main body and a top cover covering the shell main body, the shell main body is provided with a bottom and a plurality of side parts, and the bottom and the side parts jointly define a containing cavity with an opening in the upper end. The inner surface of the containing cavity comprises a coating area and a blank area arranged on the upper side of the coating area, the blank area is close to an opening of the containing cavity, and the coating area is provided with an insulating coating. According to the invention, the arrangement of the Mylar film is canceled through the arrangement of the insulating coating, and the arrangement of the blank space prevents heat from being transmitted to the insulating coating when the shell main body and the top cover are welded, so that the explosion phenomenon during welding is prevented. In addition, the utility model also provides a battery comprising the insulating battery shell.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular to an insulating battery shell and a battery. Background Art

[0002] In recent years, competition in the new energy market has become increasingly fierce, and the market has begun to pursue goals such as high power and long cycle of single large-capacity battery cells. As the energy density of battery cells continues to increase, the importance of battery safety performance is also increasing. The battery case is the key isolation layer between the battery cell and the external environment. The insulation performance between the battery case and the battery cell is particularly important to the safety of the battery.

[0003] In existing technologies, insulation between the battery cell and the battery case is achieved by wrapping the battery cell with a layer of Mylar film with insulating properties. However, the use of the Mylar film requires that the Mylar film be wrapped around the battery cell and then heat-soldered to melt and bond together to form a strong package. However, after the Mylar film is heat-soldered, wire drawing is easily generated, and laser welding of the battery case is prone to fire.

[0004] Based on this, it is urgent to invent an insulating battery shell. Utility Model Content

[0005] One of the purposes of the present utility model is to provide an insulating battery shell to address the deficiencies of the prior art, wherein the insulating battery shell can eliminate the use of Mylar film and will not cause fire when the battery shell is welded.

[0006] To solve the above technical problems, this application adopts the following technical solutions:

[0007] An insulating battery case is provided, comprising a case body and a top cover arranged on the case body, wherein the case body has a bottom and multiple side portions, wherein the bottom and the multiple side portions together enclose a accommodating cavity with an upper opening, wherein the inner surface of the accommodating cavity comprises a coating area and a blank area arranged above the coating area, wherein the blank area is close to the opening of the accommodating cavity, and the coating area is provided with an insulating coating.

[0008] Specifically, at least two of the side wall surfaces are provided with bosses, the bosses are used to provide support for the top cover, and the distance from the bosses to the opening is equal to the height of the blank area.

[0009] Specifically, it also includes a lower plastic, the lower plastic is connected to the top cover, and the height of the blank area is equal to the thickness of the lower plastic of the battery.

[0010] Specifically, the height of the blank area is greater than 1 mm.

[0011] Specifically, chamfers are provided between the side portions, and the thickness of the insulating coating at the chamfers is 1 to 1.6 times the thickness of the insulating coating at the side portions.

[0012] Specifically, the thickness of the insulating coating is 90-110 μm.

[0013] Specifically, the boss is arranged to be inclined relative to the bottom, and the inclination angle a of the boss is in the range of 10° to 45°.

[0014] Specifically, the bonding force between the insulating coating and the shell body is greater than 10 MPa.

[0015] Specifically, the top cover and the shell body are made of aluminum.

[0016] The beneficial effects of the present invention are as follows: the present application eliminates the provision of the Mylar film by providing an insulating coating, and the insulating coating forms a continuous insulating protective layer on the battery shell by coating or spraying, and the battery cell can be wrapped without hot melting, and the position of the insulating coating can be precisely controlled. Moreover, the provision of a blank area can prevent the heat during the welding of the shell body and the top cover from being transferred to the insulating coating, causing the insulating coating to catch fire, and can prevent the occurrence of explosive fire during welding ("explosive fire" usually refers to the sudden and violent flame outbreak during the welding process).

[0017] The second object of the present invention is to provide a battery comprising the above-mentioned insulating battery casing. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0019] Figure 1 Schematic diagram of the battery housing structure;

[0020] Figure 2 for Figure 1 A magnified view of the structure at point A;

[0021] Figure 3 This is a schematic diagram of the cross-sectional structure of the battery housing of this application;

[0022] Figure 4 for Figure 3 A magnified view of the structure at point B;

[0023] Wherein: 1-shell body; 11-bottom; 12-side; 13-accommodation cavity; 131-coating area; 1311-insulating coating; 132-blank area; 133-boss; 2-top cover; 3-lower plastic;

[0024] a-The inclination angle of the boss. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by technicians in the technical field of the present application. The terms used herein in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application.

[0026] In the description of this utility model, unless otherwise expressly specified or limited, the terms "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0027] Although the present application is disclosed as above in terms of a preferred embodiment, it is not intended to limit the claims. Any person skilled in the art may make several possible changes and modifications without departing from the concept of the present application. Therefore, the scope of protection of the present application shall be based on the scope defined by the claims of the present application.

[0028] The applicant has discovered that existing technologies achieve insulation between the battery cell and the battery case by wrapping a layer of insulating Mylar film around the battery cell. However, the use of the Mylar film requires that the Mylar film be wrapped around the battery cell and then heat-soldered to melt and bond the Mylar film together to form a secure package. However, after the Mylar film is heat-soldered in a hot press, when the hot press is removed from the Mylar film, the Mylar film is in a molten state and has a certain degree of fluidity, which easily causes stringing. The position and direction of the stringing are difficult to control. If these stringings are not removed, when welding the battery body and top cover, or when laser welding the battery case, if a stringing portion overlaps the weld position, the heat from the laser welding can ignite the stringing Mylar film, causing a firefight (a "firefight" generally refers to a sudden, violent burst of flames during the welding process). The occurrence of a firefight can degrade the weld quality and, in severe cases, pose a potential hazard to the welding operator and equipment. Furthermore, cleaning the stringing portion is difficult, not only complicating the process but also potentially damaging the Mylar film or the battery cell during the cleaning process.

[0029] Therefore, if Figure 1 and Figure 2 As shown, the applicant achieves insulation by applying an insulating coating 1311 and eliminates the setting of the Mylar film. The insulating coating 1311 forms a continuous insulating protective layer on the battery shell by coating or spraying, which changes the way of insulating and wrapping the battery. The battery cell can be wrapped without hot melting, no drawing will be generated, and the position of the insulating coating 1311 can be accurately controlled. The insulating coating 1311 is kept away from the welding position by setting the blank area 132, which can prevent the heat during the welding of the shell body 1 and the top cover 2 from being transferred to the insulating coating 1311 and causing the insulating coating 1311 to catch fire, thereby preventing the occurrence of fire during welding ("fire" usually refers to the sudden and violent flame outbreak during the welding process).

[0030] Implementation Method 1

[0031] like Figures 1 to 4 As shown, the present application provides an insulating battery shell, including a shell body 1 and a top cover 2 covered on the shell body 1, and the shell body 1 and the top cover 2 are connected by welding; the shell body 1 has a bottom 11 and multiple side portions 12, and the bottom 11 and the multiple side portions 12 together enclose a accommodating cavity 13 with an upper end opening, and the inner surface of the accommodating cavity 13 includes a coating area 131 and a blank area 132 arranged on the upper side of the coating area 131, the blank area 132 is close to the opening of the accommodating cavity 13, and the coating area 131 is provided with an insulating coating 1311.

[0032] The position of the coating area 131 corresponds to the position where the battery cell and the shell body 1 can contact each other. The setting of the insulating coating 1311 can form an effective electrical isolation layer between the battery cell and the shell, which can achieve insulation between the battery cell and the battery shell and enhance the safety of the battery. The paint used in the general insulating coating 1311 is sensitive to temperature and can easily ignite the insulating coating 1311 or cause the insulating coating 1311 to melt at higher temperatures. Therefore, the setting of the blank area 132 provides a key thermal isolation effect. When welding the shell body 1 and the top cover 2, the heat generated by the welding will be partially absorbed and dissipated when passing through the blank area 132, thereby reducing the heat directly transferred to the insulating coating 1311. The coating area 131 cannot accumulate heat to form a higher temperature to ignite the insulating coating 1311 or cause the insulating coating 1311 to melt. The setting of the blank area 132 can effectively reduce the performance degradation of the insulating coating 1311 caused by overheating and the explosion phenomenon during welding, thereby maintaining the insulation performance and safety of the battery shell.

[0033] The shell body 1 and the top cover 2 can be connected by a variety of welding methods such as laser welding, resistance welding and ultrasonic welding. Since the welding heat affected zones of different welding methods are different, blank areas 132 of different sizes need to be set to prevent heat from affecting the performance of the insulating coating 1311. Preferably, laser welding is used to weld the shell body 1 and the top cover 2. Laser welding has high welding precision and a small welding heat affected zone. It is not easy to affect the insulating coating 1311 in the coating area 131, and can ensure the stability of the relative position between the shell body 1 and the top cover 2 and the reliability of the connection seal.

[0034] like Figure 2 As shown, preferably, bosses 133 are provided on the wall surfaces of at least two side portions 12, and the bosses 133 are used to provide support for the top cover 2. The design of the bosses 133 can improve the docking accuracy between the top cover 2 and the shell body 1, and enhance the firmness of the overall structure. The distance from the boss 133 to the opening is equal to the height of the blank area 132. Due to the setting of the boss 133, the blank area 132 and the coating area 131 in the side portion 12 are not located in the same plane. After the heat is transferred to the blank area 132, it is difficult for the heat to be transferred to the coating area 131 through the boss 133. The distance between the boss 133 and the opening of the shell body 1 is set to the blank area 132, which can ensure that the heat generated during the welding process will not affect the insulating coating 1311 too much, preventing the coating from melting or being damaged. The boss 133 is set to support the top cover 2, so there will be contact and collision between the top cover 2 and the shell body 1 located on the upper side of the boss 133. Therefore, this part of the position is set as the blank area 132 to prevent damage to the insulating coating 1311 caused by collision.

[0035] In some embodiments, a lower plastic 3 is further included, and the lower plastic 3 is connected to the top cover 2, and the height of the blank area 132 is equal to the thickness of the lower plastic 3 of the battery. Since the lower plastic 3 and the battery cell are in contact with each other and the lower plastic 3 is insulated in the battery, the battery cell cannot contact the side 12 at the position where the lower plastic 3 is located. Therefore, setting this part as the blank area 132 can reduce the setting of the insulating coating 1311 and save the use of insulating paint. In addition, since the position requiring spraying is reduced, the time required for processing the insulating coating 1311 can be reduced.

[0036] Preferably, the height of the blank area 132 is greater than 1 mm. When laser welding is used, the height of the blank area 132 needs to be controlled above a certain height to ensure that the laser welding does not affect the insulating coating 1311.

[0037] In some embodiments, chamfers are provided between the sides 12, and the thickness of the insulating coating 1311 at the chamfers is 1 to 1.6 times the thickness of the insulating coating 1311 on the sides 12. Since the chamfers may be subjected to more stress or electrical stress generated by battery cell collisions, increasing the coating thickness can provide additional insulation protection to prevent the risk of short circuit or electric shock. Increasing the coating thickness helps to alleviate stress concentration caused by edges or corners at the chamfers, reducing the possibility of damage or insulation failure.

[0038] Preferably, the thickness of the insulating coating 1311 is 90-110 μm, which can provide sufficient insulation to prevent electrical failure or short circuit, while not causing an excessively thick coating to affect the volume and function of the device and reduce the energy density of the battery.

[0039] like Figure 3 and Figure 4 As shown, preferably, the boss 133 is arranged to be inclined relative to the bottom 11, and the inclination angle a of the boss 133 is in the range of 10° to 45°. The boss 133 is inclined and the corresponding positions of the top cover 2 and the boss 133 are chamfered with corresponding inclination angles. When the top cover 2 is covered into the shell body 1, due to the inclined design, the top cover 2 will automatically achieve precise docking of the top cover 2 and the shell body 1 during assembly under the action of gravity, and the sealing and structural stability can be guaranteed. When the inclination angle is within the above range, it can not only maintain good installation accuracy and sealing, but also ensure the stability of the structure to withstand mechanical loads, reducing the risk of deformation and damage.

[0040] Preferably, the bonding force between the insulating coating 1311 and the shell body 1 is greater than 10 MPa. When the bonding force meets the above range, the stability of the bonding between the insulating coating 1311 and the battery shell can be guaranteed. During the production and use of the shell, the insulating coating 1311 can be well bonded to the coating area for a long time, thereby better realizing the long-term safety and reliability of the shell.

[0041] Preferably, the top cover 2 and the shell body 1 are made of aluminum. Aluminum has high thermal conductivity, which helps to quickly dissipate the heat generated inside the device, prevent overheating, and improve the safety and performance stability of the device. It also has good strength and rigidity, and can provide sufficient structural support to ensure that the device remains stable during use.

[0042] Specific implementation of the insulating coating 1311

[0043] 1. Aluminum shell stretch forming;

[0044] 2. A protective device is placed on the outside of the aluminum shell and extends into the inside of the aluminum shell with a protective height of 1.5mm±0.1mm; and it is equipped with a fixing device.

[0045] 3. After protection, the aluminum shell is transported to the spraying equipment for spraying with UV insulating ink. After spraying, it is inspected for defects and insulation. After the inspection, qualified products are packaged and shipped.

[0046] 4. Delivery to the battery production line for production and use. The above description shows and describes several preferred embodiments of the utility model. However, as mentioned above, it should be understood that the utility model is not limited to the form disclosed herein and should not be regarded as excluding other embodiments. It can be used in various other combinations, modifications and environments, and can be modified within the scope of the utility model concept, through the above teachings or technology or knowledge in related fields. Changes and modifications made by those skilled in the art do not depart from the spirit and scope of the utility model and should be protected by the claims attached to the utility model.

Claims

1. An insulating battery housing, characterized in that: The invention comprises a shell body (1) and a top cover (2) arranged on the shell body (1), wherein the shell body (1) has a bottom (11) and a plurality of side portions (12), wherein the bottom (11) and the plurality of side portions (12) together enclose a receiving cavity (13) with an upper end opening, and the inner surface of the receiving cavity (13) comprises a coating area (131) and a blank area (132) arranged on the upper side of the coating area (131), wherein the blank area (132) is close to the opening of the receiving cavity (13), and the coating area (131) is provided with an insulating coating (1311).

2. The insulating battery case according to claim 1, wherein: At least two of the side walls (12) are provided with bosses (133), the bosses (133) are used to provide support for the top cover (2), and the distance from the bosses (133) to the opening is equal to the height of the blank area (132).

3. The insulating battery case according to claim 1, wherein: It also includes a lower plastic (3), the lower plastic (3) is connected to the top cover (2), and the height of the blank area (132) is equal to the thickness of the lower plastic (3) of the battery.

4. The insulating battery case according to claim 2 or 3, wherein: The height of the blank area (132) is greater than 1 mm.

5. The insulating battery case according to claim 1, wherein: Chamfers (14) are provided between the side portions (12), and the thickness of the insulating coating (1311) at the chamfers (14) is 1 to 1.6 times the thickness of the insulating coating (1311) on the side portions (12).

6. The insulating battery case according to claim 1, wherein: The thickness of the insulating coating (1311) is 90-110 μm.

7. The insulating battery case according to claim 2, wherein: The boss (133) is arranged to be inclined relative to the bottom (11), and the inclination angle a of the boss (133) is in the range of 10° to 45°.

8. The insulating battery case according to claim 1, wherein: The bonding force between the insulating coating (1311) and the shell body (1) is greater than 10 MPa.

9. The insulating battery case according to claim 1, wherein: The top cover (2) and the shell body (1) are made of aluminum.

10. A battery, characterized in that: The invention comprises a battery cell and the insulating battery casing according to any one of claims 1 to 9.

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