CN207183323U - battery case - Google Patents

Abstract

The utility model provides a battery case, including casing, apron and first explosion-proof piece, the apron sets up the upper end opening of casing, just the casing with form sealed accommodation space between the apron, the casing include with the relative bottom plate that sets up of apron, be provided with first explosion-proof hole on the bottom plate, first explosion-proof piece forms just seal in the first explosion-proof hole. The utility model discloses a battery case sets up first explosion-proof hole through the bottom at the casing, and first explosion-proof piece forms in first explosion-proof hole and seals first explosion-proof hole. Thus, when the internal pressure of the battery is increased to a certain value, the gas can burst the first explosion-proof piece at the bottom of the shell to be discharged, and explosion is avoided. In addition, with the setting of explosion-proof piece on battery case's casing bottom plate, the explosion-proof piece is broken open electrolyte and is up sprayed when having avoided only setting up the upper cover plate top to the influence to other batteries and equipment has been reduced.

Description

battery case

technical field

The utility model belongs to the technical field of batteries, in particular to a battery case.

Background technique

With the introduction of the concept of environmental protection, power batteries, as the main source of power for new energy vehicles, have become a key component of electric vehicles.

The extensive use of power batteries makes their safety performance more and more people's attention. When the battery is abnormal, a large amount of gas will be generated inside the battery, causing the internal pressure of the battery to increase sharply. At this time, if the large amount of gas generated cannot be discharged in time, the battery will explode and cause a safety accident. In order to avoid the occurrence of explosion and improve the safety performance of the battery, it is necessary to install an explosion-proof device on the battery cover. The explosion-proof devices in the prior art are generally provided with an explosion-proof plate above the battery cover. When the internal pressure of the battery increases to a certain value, the gas can break through the explosion-proof plate and be discharged, reducing the internal pressure of the battery, thereby avoiding the explosion. However, setting the explosion-proof disk above the battery cover will cause the electrolyte to spray upward after the explosion-proof disk explodes, which will affect other batteries and equipment, and even destroy other batteries and equipment.

Utility model content

The technical problem to be solved by the utility model is to provide a battery for the technical defect that the explosion-proof sheet is arranged above the battery cover in the prior art, causing the electrolyte to spray upward after the explosion-proof sheet explodes, which will affect other batteries and equipment. shell.

The technical solution adopted by the utility model to solve the problems of the technologies described above is:

A battery casing is provided, including a casing, a cover plate, and a first explosion-proof plate, the cover plate is arranged at the upper end opening of the casing, and a sealed accommodation space is formed between the casing and the cover plate , the housing includes a bottom plate opposite to the cover plate, the bottom plate is provided with a first explosion-proof hole, the first explosion-proof sheet is formed in the first explosion-proof hole and closes the first explosion-proof hole .

Optionally, the first explosion-proof hole includes a large-diameter portion, a middle-diameter portion, and a small-diameter portion, a first stepped surface is formed below the middle-diameter portion and the small-diameter portion, and the large-diameter portion and the small-diameter portion A second step surface is formed between the middle diameter parts, and the first explosion-proof plate is sealingly connected with the first step surface to close the first explosion-proof hole, and the lower surface of the first explosion-proof plate is connected to the second The upper surface of the step surface is even.

Optionally, the first rupture disc is welded on the first stepped surface.

Optionally, the first explosion-proof plate is provided with an annular groove opening downward, and the annular groove is located in the first explosion-proof hole.

Optionally, the first explosion-proof disk is integrally formed with the bottom plate.

Optionally, the cover plate is provided with a second explosion-proof hole and a second explosion-proof sheet, the second explosion-proof sheet is formed in the second explosion-proof hole and closes the second explosion-proof hole, and the second explosion-proof sheet The explosion-proof pressure of the sheet is greater than the explosion-proof pressure of the first explosion-proof sheet.

Optionally, a first explosion-proof disk protection film is provided on the outer side of the bottom plate below the first explosion-proof disk.

Optionally, a second explosion-proof disk protection film is arranged above the second explosion-proof disk, and the first explosion-proof disk protection film and the second explosion-proof disk protection film are PET films.

The battery casing provided by the utility model includes a casing, a cover plate and a first explosion-proof plate. A first explosion-proof hole is provided, and the first explosion-proof sheet is formed in the first explosion-proof hole and closes the first explosion-proof hole. In this way, by setting the first explosion-proof hole at the bottom of the casing, when the internal pressure of the battery increases to a certain value, the gas can break through the first explosion-proof plate at the bottom of the casing and discharge, reducing the internal pressure of the battery, thereby avoiding the occurrence of explosion . In addition, the explosion-proof disk is arranged on the bottom plate of the battery case, which avoids the explosion-proof electrolyte spraying upward when the explosion-proof disk is arranged on the top of the upper cover, thereby reducing the impact of the electrolyte on other batteries and equipment.

Description of drawings

Fig. 1 is a three-dimensional schematic diagram of a battery case provided by an embodiment of the present invention;

Fig. 2 is a schematic diagram of a battery case provided by an embodiment of the present invention;

Fig. 3 is a schematic cross-sectional view of the battery casing and its casing provided by an embodiment of the present invention;

Fig. 4 is an enlarged view at a in Fig. 3 .

The reference signs in the instructions are as follows:

1. Shell; 11. The first explosion-proof hole; 12. The first step surface; 13. The second step surface;

2. Cover plate; 21. The protective film of the second explosion-proof disc;

3. The first explosion-proof disc; 31. The annular groove; 32. The protective film of the first explosion-proof disc.

Detailed ways

In order to make the technical problems, technical solutions and beneficial effects solved by the utility model clearer, the utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not intended to limit the utility model.

An embodiment of the utility model provides a battery casing, as shown in Figures 1 to 4, including a casing 1, a cover plate 2 and a first explosion-proof plate 3, the cover plate 2 is arranged on the top of the casing 1 The upper end is open, and a sealed accommodating space is formed between the housing 1 and the cover plate 2. The housing 1 includes a bottom plate opposite to the cover plate 2, and a first explosion-proof The first explosion-proof plate 3 is formed in the first explosion-proof hole 11 and closes the first explosion-proof hole 11 .

In order to prevent the electrolyte inside the battery from spraying upwards after the explosion-proof disc bursts to affect other batteries and equipment, the first explosion-proof disc 3 is arranged on the casing 1 . However, since the battery is wound and placed in the sealed accommodation space formed between the casing 1 and the cover plate 2, when the internal pressure of the battery is too high, the internal temperature of the battery will also rise accordingly, and the wound battery will be horizontally Expansion will cause the shell 1 to expand to both sides. If the first burst plate 3 is set on the side of the shell 1, the first burst plate 3 will be blocked due to the expansion of the shell 1, resulting in the first burst plate 3 failure.

As shown in Figures 2 to 3, the first explosion-proof hole 11 includes a large diameter portion, a middle diameter portion and a small diameter portion, and a first stepped surface 12 is formed below the middle diameter portion and the small diameter portion, so A second step surface 13 is formed between the large diameter portion and the middle diameter portion, and the first explosion-proof plate 3 is sealingly connected with the first step surface 12 to close the first explosion-proof hole 11, and the first explosion-proof plate 3 A lower surface of the explosion-proof plate 3 is flush with the upper surface of the second stepped surface 13 . In this way, the space below the first explosion-proof disk 3 is larger than that of the first explosion-proof disk 3 , thereby facilitating the bursting of the first explosion-proof disk 3 . In this embodiment, the first explosion-proof plate 3 is welded on the first stepped surface 12 . The arrangement of the first stepped surface 12 provides a welding point for the installation of the first explosion-proof disk 3 , thus facilitating the installation of the first explosion-proof disk 3 in the first explosion-proof hole 11 .

However, in other embodiments, the first explosion-proof disk 3 may also be directly formed in the first explosion-proof hole 11 , or the first explosion-proof disk 3 is integrally formed with the bottom plate.

As shown in FIG. 3 , the first explosion-proof plate 3 is provided with an annular groove 31 opening downward, and the annular groove 31 is located in the first explosion-proof hole 11 . In this way, the position of the annular groove 31 on the first explosion-proof plate 3 is equivalent to the weak link of the first explosion-proof plate 3. When the battery pressure reaches a certain level, it is conducive to the blasting of the first explosion-proof plate 3, and the annular groove 31 is in the first explosion-proof position. Within the range of the hole 11, it is beneficial for the electrolyte to flow out after the first explosion-proof disc 3 bursts open.

In this embodiment, the cover plate 2 is provided with a second explosion-proof hole (not shown in the figure) and a second explosion-proof plate (not shown in the figure), and the second explosion-proof plate is formed on the second explosion-proof plate. The explosion-proof pressure of the second explosion-proof plate is greater than that of the first explosion-proof plate 3 and closes the second explosion-proof hole. In this way, the first explosion-proof plate 3 and the second explosion-proof plate can double ensure the safety of the battery. Since the explosion-proof pressure of the second explosion-proof plate is greater than the explosion-proof pressure of the first explosion-proof plate 3, when the internal pressure of the battery increases, the gas is preferentially discharged from the bottom of the housing 1. If the first explosion-proof plate 3 at the bottom fails, the gas Will be discharged from the top of the housing 1.

In this embodiment, the first explosion-proof disk 3 is an aluminum explosion-proof disk.

However, in other embodiments, the material and type of the first explosion-proof disk 3 and the second explosion-proof disk only need to meet the explosion-proof pressure requirements.

In this embodiment, in order to protect the first explosion-proof disk 3 and the second explosion-proof disk from the influence of the external environment, a first explosion-proof disk protective film 32 is arranged on the outside of the bottom plate below the first explosion-proof disk 3 , A second explosion-proof disk protective film 21 is arranged above the second explosion-proof disk. Wherein the first explosion-proof sheet protection film 32 and the second explosion-proof sheet protection film 21 are both PET films.

The battery case provided in this embodiment is mainly used in lithium batteries. Of course, its application is not limited to lithium batteries, but can also be used in various other batteries, such as lead-acid batteries, alkaline manganese batteries, and the like.

The battery casing provided in the above embodiments includes a casing, a cover plate and a first explosion-proof plate, the cover plate is arranged at the upper end opening of the casing, and a sealed container is formed between the casing and the cover plate. The housing includes a bottom plate opposite to the cover plate, the bottom plate is provided with a first explosion-proof hole, and the first explosion-proof plate is formed in the first explosion-proof hole and closes the first explosion-proof hole. Blast holes. By providing the first explosion-proof hole at the bottom of the casing, the first explosion-proof plate is formed in the first explosion-proof hole and closes the first explosion-proof hole. In this way, by setting the first explosion-proof hole at the bottom of the casing, when the internal pressure of the battery increases to a certain value, the gas can break through the first explosion-proof plate at the bottom of the casing and discharge, reducing the internal pressure of the battery, thereby avoiding the occurrence of explosion . In addition, the explosion-proof sheet is arranged on the bottom plate of the battery case, which avoids the explosion-proof electrolyte spraying upward when the explosion-proof sheet is arranged on the top of the upper cover, thereby reducing the impact of the electrolyte on other batteries and equipment .

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present utility model shall be included in this utility model. within the scope of protection of utility models.

Claims (8)

1. A battery casing, characterized in that it comprises a housing, a cover plate and a first explosion-proof plate, the cover plate is arranged on the upper opening of the housing, and a gap is formed between the housing and the cover plate A sealed accommodating space, the housing includes a bottom plate opposite to the cover plate, the bottom plate is provided with a first explosion-proof hole, the first explosion-proof plate is formed in the first explosion-proof hole and closes the Describe the first explosion-proof hole. 2. The battery casing according to claim 1, wherein the first explosion-proof hole comprises a large diameter portion, a middle diameter portion and a small diameter portion, and a second explosion-proof hole is formed below the middle diameter portion and the small diameter portion. A stepped surface, a second stepped surface is formed between the large-diameter portion and the middle-diameter portion, the first explosion-proof plate is sealingly connected with the first stepped surface to close the first explosion-proof hole, and the The lower surface of the first explosion-proof disk is flush with the upper surface of the second stepped surface. 3. The battery casing according to claim 2, wherein the first explosion-proof sheet is welded on the first stepped surface. 4 . The battery casing according to claim 2 , wherein the first explosion-proof sheet is provided with an annular groove opening downward, and the annular groove is located in the first explosion-proof hole. 5 . The battery casing according to claim 1 , wherein the first explosion-proof sheet is integrally formed with the bottom plate. 6. The battery casing according to claim 1, wherein a second explosion-proof hole and a second explosion-proof sheet are arranged on the cover plate, and the second explosion-proof sheet is formed in the second explosion-proof hole and closed In the second explosion-proof hole, the explosion-proof pressure of the second explosion-proof plate is greater than the explosion-proof pressure of the first explosion-proof plate. 7 . The battery casing according to claim 6 , wherein a protective film of a first explosion-proof disk is provided on the outer side of the bottom plate below the first explosion-proof disk. 8 . 8. The battery casing according to claim 7, wherein a second explosion-proof sheet protective film is arranged above the second explosion-proof sheet, and the first explosion-proof sheet protective film and the second explosion-proof sheet protective film For PET film.