Battery shell repairing device

Abstract

The utility model discloses a battery shell repairing device. The battery shell repairing device comprises a gas injection assembly and a limiting assembly, the gas injection assembly comprises a gas injection part, and the gas injection part is used for covering a liquid injection hole of a battery shell and is used for being in sealed connection with the edge of the liquid injection hole; the limiting assembly comprises a first limiting piece and a second limiting piece, the first limiting piece is provided with a first limiting wall, the first limiting wall is used for being parallel to one large face of the battery shell, the second limiting piece is provided with a second limiting wall, and the second limiting wall is used for being parallel to the other large face of the battery shell; the first limiting wall and the second limiting wall are arranged at an interval to define a limiting space, the limiting space is used for placing the battery shell, and the first limiting wall and the second limiting wall are respectively used for abutting against the two large surfaces. The battery shell repairing device provided by the utility model can be used for repairing the sunken battery shell.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery casing repair device. Background Art

[0002] Square aluminum shell batteries need to undergo a formation treatment before they are produced and shipped. During the formation process, gas will be generated inside the shell due to chemical reactions. Therefore, negative pressure needs to be pumped onto the battery during the formation process to ensure that the gas generated by the battery is discharged and to prevent the battery from bulging. However, during the negative pressure pumping process, there is also the problem of the shell becoming concave due to the negative pressure pumping. Utility Model Content

[0003] In view of this, the purpose of this application is to overcome the deficiencies in the prior art and to provide a battery casing repair device that can repair a depressed battery casing.

[0004] To achieve the above objectives, the technical solutions adopted in this application are as follows:

[0005] According to the battery shell repair device of the embodiment of the present application, it includes: a gas injection assembly, the gas injection assembly includes a gas injection part, the gas injection part is used to cover the injection hole of the battery shell and is used to seal and connect with the edge of the injection hole; a limiting assembly, the limiting assembly includes a first limiting part and a second limiting part, the first limiting part has a first limiting wall, the first limiting wall is used to be arranged parallel to one of the large surfaces of the battery shell, the second limiting part has a second limiting wall, the second limiting wall is used to be arranged parallel to the other large surface of the battery shell, the first limiting wall and the second limiting wall are spaced apart to define a limiting space, the limiting space is used for placing the battery shell, and the first limiting wall and the second limiting wall are respectively used to offset the two large surfaces.

[0006] The battery casing repair device of the present application has the following advantages:

[0007] In the battery shell repair device of the present application, since the gas injection piece is used to cover the liquid injection hole and is used to seal and connect with the edge of the liquid injection hole, nitrogen can be injected into the battery shell through the gas injection piece, so that the interior of the shell is pressurized by the nitrogen injected into the shell, so that the recessed part of the shell can be filled and leveled. Moreover, since the first limiting wall of the first limiting piece and the second limiting wall of the second limiting piece are spaced apart from each other to define a limiting space, when repairing the battery shell, the battery can be placed in the limiting space, and the outer bulge of the recessed part of the battery shell can be limited by the first limiting wall and the second limiting wall, and the battery shell can be filled and leveled when the battery shell is formed. During the negative pressure process, most of the depressions in the shell are generated on the two large surfaces of the shell. Since the first limiting wall is used to be set parallel to one of the large surfaces, and the second limiting wall is used to be set parallel to the other large surface of the battery, when the inside of the shell is pressurized, the first limiting wall can be used to limit the first large surface to prevent the first large surface from bulging during the charging process. Similarly, the second limiting wall can be used to limit the second large surface to prevent the second large surface from bulging during the charging process. In this way, it is possible to repair the depressions in the battery shell and prevent the battery shell from bulging during the repair process, thereby completing the repair of the depressed battery shell.

[0008] According to the battery shell repair device of the embodiment of the present application, the battery shell repair device has a first direction, and the gas injection assembly further includes a driving member, the gas injection member is connected to the driving member, and the driving member is used to drive the gas injection member to move along the first direction.

[0009] According to the battery shell repair device of the embodiment of the present application, the battery shell repair device also has a second direction, which is perpendicular to the first direction. The gas injection assembly also includes a first connecting member, which is connected to the driving member. The first connecting member is provided with a connecting groove extending along the second direction, and the gas injection member is connected to any groove wall of the connecting groove along the second direction.

[0010] According to the battery shell repair device of the embodiment of the present application, the gas injection assembly also includes a second connecting member and a fastener, the gas injection member is connected to the second connecting member, the second connecting member is provided with a connecting hole, the connecting hole is connected to the connecting groove, and the fastener is simultaneously passed through the connecting groove and the connecting hole.

[0011] According to the battery shell repair device of the embodiment of the present application, the gas injection part includes a gas injection portion and a connecting tube portion, the connecting tube portion is extended along the first direction and is connected to the driving part, the gas injection part is connected to one end of the connecting tube portion along the first direction, the gas injection part is provided with a sealing cavity, the sealing cavity is communicated with the connecting tube portion, and the sealing cavity is used to cover the liquid injection hole and to close the liquid injection hole.

[0012] According to the battery casing repair device of the embodiment of the present application, the gas injection part is made of a flexible material.

[0013] According to the battery case repair device of the embodiment of the present application, the battery case repair device has a first direction, a second direction and a third direction, and the third direction is perpendicular to the first direction and the second direction respectively. The battery case repair device also includes a base, and the first limit member and the second limit member are arranged on the base at intervals along the third direction, and the first limit member or the second limit member is detachably connected to the base.

[0014] According to the battery casing repair device of an embodiment of the present application, the limiting assembly also includes a third connecting member, one end of the third connecting member along the third direction is connected to the first limiting member, and the other end of the third connecting member along the third direction is detachably connected to the second limiting member.

[0015] According to the battery casing repair device of an embodiment of the present application, the limiting assembly also includes a fixing member, which is arranged on the base, the first limiting member is connected to the fixing member, and the end of the third connecting member connected to the first limiting member is connected to the fixing member.

[0016] According to the battery shell repair device of the embodiment of the present application, the limiting assembly also includes a position adjustment member, and the battery shell repair device also includes a frame, which is arranged on the base, and the frame and the first limiting member are spaced apart along the third direction to define an adjustment space, and the position adjustment member is arranged in the adjustment space, and the position adjustment member is respectively abutted against the first limiting member and the frame on both sides along the third direction; wherein the thickness of the position adjustment member along the third direction is adjustable. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 A schematic diagram of the connection structure between the battery casing repair device and the battery casing in the present application is shown;

[0019] Figure 2 The structure diagram of the battery shell repair device in this application is shown Figure 1 ;

[0020] Figure 3 The structure diagram of the battery shell repair device in this application is shown Figure 2 ;

[0021] Figure 4 A schematic structural diagram of the first connecting member, the second connecting member, and the gas injection member in this application is shown;

[0022] Figure 5 A schematic cross-sectional structural diagram of the gas injection component in this application is shown.

[0023] Description of main component symbols:

[0024] 100 - gas injection assembly; 110 - gas injection member; 111 - gas injection portion; 1111 - sealing chamber; 112 - connecting pipe; 120 - driving member; 130 - first connecting member; 131 - connecting groove; 140 - second connecting member; 141 - connecting hole;

[0025] 200-limiting assembly; 210-first limiting member; 211-first limiting wall; 220-second limiting member; 221-second limiting wall; 230-limiting space; 240-third connecting member; 250-fixing member; 270-position adjusting member;

[0026] 300-base;

[0027] 400-rack;

[0028] 500-Adjustment space;

[0029] 20-battery housing; 21-liquid injection hole;

[0030] x-first direction; y-second direction; z-third direction. DETAILED DESCRIPTION

[0031] The following describes in detail embodiments of the present application. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application and are not to be construed as limiting the present application.

[0032] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0033] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. Throughout the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0034] In this application, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components or interactions between two components. Those skilled in the art will understand the specific meanings of these terms in this application based on specific circumstances.

[0035] In this application, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0036] Reference Figure 1 、 Figure 2 as well as Figure 3 As shown, the battery shell 20 repair device involved in the embodiment of the present application includes: a gas injection component 100 and a limiting component 200.

[0037] Specifically, the gas injection assembly 100 includes a gas injection part 110, which is used to cover the injection hole 21 of the battery shell 20 and is used to seal and connect with the edge of the injection hole 21; the limiting assembly 200 includes a first limiting part 210 and a second limiting part 220, the first limiting part 210 has a first limiting wall 211, the first limiting wall 211 is used to be set parallel to one of the large surfaces of the battery shell 20, the second limiting part 220 has a second limiting wall 221, the second limiting wall 221 is used to be set parallel to the other large surface of the battery shell 20, the first limiting wall 211 and the second limiting wall 221 are spaced apart to define a limiting space 230, the limiting space 230 is used for placing the battery shell 20, and the first limiting wall 211 and the second limiting wall 221 are used to offset the two large surfaces respectively.

[0038] In the battery shell 20 repair device of the present application, since the gas injection part 110 is used to cover the liquid injection hole 21 and is used to seal and connect with the edge of the liquid injection hole 21, nitrogen can be injected into the battery shell 20 through the gas injection part 110, so that the interior of the shell can be pressurized by the nitrogen injected into the shell, so that the recessed part of the shell can be leveled, and since the first limiting wall 211 of the first limiting part 210 and the second limiting wall 221 of the second limiting part 220 are spaced apart from each other to define a limiting space 230, therefore, when repairing the battery shell 20, the battery can be placed in the limiting space 230, and the recessed part of the battery shell 20 can be leveled by the first limiting wall 211 and the second limiting wall 221. The outer bulge at the shell is limited. During the process of forming a negative pressure, most of the depressions of the shell are generated on the two large surfaces of the shell. Since the first limiting wall 211 is used to be arranged parallel to one of the large surfaces, and the second limiting wall 221 is used to be arranged parallel to the other large surface of the battery, therefore, when the inside of the shell is pressurized, the first limiting wall 211 can be used to limit the first large surface to avoid the first large surface from bulging during the charging process. Similarly, the second limiting wall 221 can be used to limit the second large surface to avoid the second large surface from bulging during the charging process. In this way, it is possible to repair the depression of the battery shell 20 and avoid the battery shell 20 from bulging during the repair process, thereby completing the repair of the depressed battery shell 20.

[0039] Reference Figure 2 As shown, the battery shell 20 repair device has a first direction x, and the gas injection assembly 100 further includes a driving member 120. The gas injection member 110 is connected to the driving member 120, and the driving member 120 is used to drive the gas injection member 110 to move along the first direction x.

[0040] It should be noted that the first direction x is Figure 2 In the direction indicated by x, the liquid injection hole 21 of the battery housing 20 and the gas injection member 110 are spaced apart along the first direction x.

[0041] In this embodiment, the driving member 120 can drive the gas injection member 110 to move along the first direction x, so that the gas injection member 110 can be close to the liquid injection hole 21, and the gas injection member 110 can be covered on the liquid injection hole 21, thereby achieving the purpose of injecting nitrogen into the liquid injection hole 21.

[0042] Reference Figure 2 as well as Figure 4 As shown, the battery shell 20 repair device also has a second direction y, which is perpendicular to the first direction x. The gas injection assembly 100 also includes a first connecting member 130, which is connected to the driving member 120. The first connecting member 130 is provided with a connecting groove 131 extending along the second direction y, and the gas injection member 110 is connected to any groove wall of the connecting groove 131 along the second direction y.

[0043] It should be noted that the second direction y is Figure 2 The direction indicated by y.

[0044] In this embodiment, since the first connecting member 130 is connected to the driving member 120, the first connecting member 130 can be driven by the driving member 120 to move along the first direction x, so that the first connecting member 130 drives the gas injection member 110 to move along the first direction x. Since the first connecting member 130 is provided with a connecting groove 131 extending along the second direction y, the gas injection member 110 is connected to the groove wall of the connecting groove 131 at any point along the second direction y. Therefore, the position of the gas injection member 110 in the second direction y can be adjusted by adjusting the connection position of the gas injection member 110 and the groove wall of the connecting groove 131, so that the gas injection member 110 can be located at the same position as the liquid injection hole 21 in the second direction y, so that the gas injection member 110 can approach and cover the liquid injection hole 21 along the first direction x.

[0045] Continue to refer to Figure 2 as well as Figure 4 As shown, the gas injection assembly 100 also includes a second connecting member 140 and a fastener. The gas injection member 110 is connected to the second connecting member 140. The second connecting member 140 is provided with a connecting hole 141. The connecting hole 141 is connected to the connecting groove 131. The fastener is simultaneously passed through the connecting groove 131 and the connecting hole 141.

[0046] In this embodiment, since the fastener is passed through the connecting groove 131 and the connecting hole 141 at the same time, the second connecting member 140 can be connected to the first connecting member 130 through the fastener. At the same time, the connection position of the second connecting member 140 on the first connecting member 130 can be adjusted by adjusting the position of the fastener passing through the connecting groove 131. Since the gas injection member 110 is connected to the second connecting member 140, the position of the gas injection member 110 in the second direction y can be adjusted by adjusting the position of the second connecting member 140 on the second connecting member 140, so that the gas injection member 110 can be located at the same position as the liquid injection hole 21 in the second direction y.

[0047] Specifically, in this embodiment, the fastener is a stud bolt, and the second connecting member 140 and the first connecting member 130 are connected by the stud bolt.

[0048] Reference Figure 5 As shown, the gas injection component 110 includes a gas injection portion 111 and a connecting pipe portion 112. The connecting pipe portion 112 extends along the first direction x and is connected to the driving component 120. The gas injection portion 111 is connected to one end of the connecting pipe portion 112 along the first direction x. The gas injection portion 111 is provided with a sealing cavity 1111. The sealing cavity 1111 is communicated with the connecting pipe portion 112, and the sealing cavity 1111 is used to cover the liquid injection hole 21 and to close the liquid injection hole 21.

[0049] In this embodiment, one end of the connecting tube along the first direction x is used to connect to the gas supply equipment, and the other end of the connecting tube along the first direction x is connected to the gas injection part 111, and the connecting tube is connected to the driving member 120. Therefore, the nitrogen in the gas supply equipment can be introduced into the gas injection part 111 through the connecting tube, and the gas injection part 111 is driven to move along the first direction x through the connecting tube. Since the sealed cavity 1111 of the gas injection part 111 is connected to the connecting tube part 112, and the sealed cavity 1111 is used to cover the liquid injection hole 21, the nitrogen can enter the sealed cavity 1111 through the connecting tube, and then enter the liquid injection hole 21 through the sealed cavity 1111. Since the sealed cavity 1111 is used to seal the liquid injection hole 21, the possibility of nitrogen leaking through the gap between the sealed cavity 1111 and the liquid injection hole 21 can be reduced, thereby improving the inflation efficiency.

[0050] Specifically, in this embodiment, the gas injection portion 111 is made of a flexible material.

[0051] More specifically, in this embodiment, the gas injection portion 111 is made of rubber, and in particular, the gas injection portion 111 is made of EPDM rubber.

[0052] In this embodiment, since the gas injection portion 111 is made of a flexible material, the gas injection portion 111 can have the advantage of corrosion resistance, thereby increasing the service life of the gas injection portion 111. At the same time, the gas injection portion 111 can have a better fit with the edge of the liquid injection hole 21, thereby improving the sealing performance of the gas injection portion 111 to the edge of the liquid injection hole 21, thereby reducing the possibility of nitrogen leakage through the gap between the gas injection portion 111 and the liquid injection hole 21, thereby improving the inflation efficiency.

[0053] Reference Figure 2 as well as Figure 3 As shown, the battery shell 20 repair device also has a third direction z, which is perpendicular to the first direction x and the second direction y. The battery shell 20 repair device also includes a base 300, and the first limiting member 210 and the second limiting member 220 are arranged on the base 300 at intervals along the third direction z, and the first limiting member 210 or the second limiting member 220 is detachably connected to the base 300.

[0054] It should be noted that the third direction z is Figure 2 as well as Figure 3 The direction indicated by z.

[0055] In this embodiment, since the first limiting member 210 or the second limiting member 220 is detachably connected to the base 300, when the battery housing 20 is limited by the first limiting member 210 and the second limiting member 220, the first limiting member 210 can be first removed from the base 300, the battery housing 20 is tightly attached to the second limiting member 220, and then the first limiting member 210 is installed on the base 300 and tightly attached to the battery housing 20, thereby achieving the first limiting member 210 and the second limiting member 220 limiting the battery housing 20. Similarly, the second limiting member 220 can be first removed from the base 300, the battery housing 20 is tightly attached to the first limiting member 210, and then the second limiting member 220 is installed on the base 300 and tightly attached to the battery housing 20, thereby achieving the first limiting member 210 and the second limiting member 220 limiting the battery housing 20.

[0056] Continue to refer to Figure 2 as well as Figure 3 As shown, the limiting assembly 200 further includes a third connecting member 240 , one end of the third connecting member 240 along the third direction z is connected to the first limiting member 210 , and the other end of the third connecting member 240 along the third direction z is detachably connected to the second limiting member 220 .

[0057] In this embodiment, since one end of the third connecting member 240 along the third direction z is connected to the first limiting member 210, and the other end of the third connecting member 240 along the third direction z is detachably connected to the second limiting member 220, the third connecting member 240 can realize a detachable connection between the first limiting member 210 and the second limiting member 220. When the battery housing 20 is limited by the first limiting member 210 and the second limiting member 220, the second limiting member 220 can be separated from the third connecting member 240 first to remove the second limiting member 220 from the base 300, and the battery housing 20 is tightly attached to the first limiting member 210, and then the second limiting member 220 is connected to the third connection to install the second limiting member 220 on the base 300 and tightly attach to the battery housing 20, thereby realizing the limitation of the battery housing 20 by the first limiting member 210 and the second limiting member 220.

[0058] Specifically, in this embodiment, the third connecting member 240 is a clip, which realizes a detachable connection between the third connecting member 240 and the second limiting member 220, thereby realizing a detachable connection between the first limiting member 210 and the second limiting member 220, so as to improve the limiting effect of the first limiting member 210 and the second limiting member 220 on the battery housing 20.

[0059] Continue to refer to Figure 2 as well as Figure 3 As shown, the limiting assembly 200 also includes a fixing member 250, which is arranged on the base 300, the first limiting member 210 is connected to the fixing member 250, and the end of the third connecting member 240 connected to the first limiting member 210 is connected to the fixing member 250.

[0060] In this embodiment, since the fixing member 250 is arranged on the base 300, the first limiting member 210 is connected to the fixing member 250, and the end of the third connecting member 240 connected to the first limiting member 210 is connected to the fixing member 250. In this way, the first limiting member 210 can be fixed to the base 300 by the fixing member 250. At the same time, the fixed connection between the first limiting member 210 and the third connecting member 240 is realized by the fixing member 250, so that the installation position of the second limiting member 220 can be confirmed with the first limiting member 210 as a reference.

[0061] Continue to refer to Figure 2 as well as Figure 3As shown, the limit assembly 200 also includes a position adjustment member 270, and the battery shell 20 repair device also includes a frame 400, which is arranged on the base 300, and the frame 400 and the first limit member 210 are spaced apart along the third direction z to define an adjustment space 500, and the position adjustment member 270 is arranged in the adjustment space 500, and the position adjustment member 270 is respectively against the first limit member 210 and the frame 400 on both sides along the third direction z; wherein, the thickness of the position adjustment member 270 along the third direction z is adjustable.

[0062] In this embodiment, since the position adjustment member 270 is arranged in the adjustment space 500, and the position adjustment member 270 is respectively against the first limiting member 210 and the frame 400 on both sides along the third direction z, the thickness of the position adjustment member 270 along the third direction z is adjustable. Therefore, the installation position of the first limiting member 210 on the base 300 can be adjusted by adjusting the thickness of the position adjustment member 270 along the third direction z, so as to adjust the installation position of the first limiting member 210 according to the thickness of different batteries, so that the battery shell 20 repair device of the present application can be suitable for batteries of different thicknesses.

[0063] Specifically, in this embodiment, when the thickness of the position adjustment member 270 changes, the first limiting member 210 can be adjusted to offset the position adjustment member 270 by adjusting the installation position of the first limiting member 210 on the fixing member 250, thereby adjusting the installation position of the first limiting member 210 on the base 300.

[0064] Specifically, in this embodiment, the driving member 120 is connected to the frame 400 , so that the driving member 120 is fixed by the frame 400 , so that the driving member 120 can drive the gas injection member 110 to move along the first direction x.

[0065] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0066] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A battery casing repair device, characterized in that: include: A gas injection assembly, the gas injection assembly including a gas injection piece, the gas injection piece is used to cover the liquid injection hole of the battery shell and is used to be sealed with the edge of the liquid injection hole; A limiting assembly, wherein the limiting assembly includes a first limiting member and a second limiting member, the first limiting member having a first limiting wall, the first limiting wall being used to be arranged parallel to one of the large surfaces of the battery shell, the second limiting member having a second limiting wall, the second limiting wall being used to be arranged parallel to the other large surface of the battery shell, the first limiting wall and the second limiting wall being spaced apart to define a limiting space, the limiting space being used for placing the battery shell, and the first limiting wall and the second limiting wall being used to offset the two large surfaces respectively.

2. The battery casing repair device according to claim 1, characterized in that: The battery shell repair device has a first direction, and the gas injection assembly further includes a driving member, the gas injection member is connected to the driving member, and the driving member is used to drive the gas injection member to move along the first direction.

3. The battery casing repair device according to claim 2, characterized in that: The battery shell repair device also has a second direction, which is perpendicular to the first direction. The gas injection assembly also includes a first connecting member, which is connected to the driving member. The first connecting member is provided with a connecting groove extending along the second direction. The gas injection member is connected to any groove wall of the connecting groove along the second direction.

4. The battery casing repair device according to claim 3, characterized in that: The gas injection assembly also includes a second connecting piece and a fastener. The gas injection piece is connected to the second connecting piece. The second connecting piece is provided with a connecting hole. The connecting hole is connected to the connecting groove. The fastener is simultaneously passed through the connecting groove and the connecting hole.

5. The battery casing repair device according to claim 2, characterized in that: The gas injection part includes a gas injection portion and a connecting pipe portion, the connecting pipe portion extends along the first direction and is connected to the driving part, the gas injection portion is connected to one end of the connecting pipe portion along the first direction, the gas injection part is provided with a sealing cavity, the sealing cavity is communicated with the connecting pipe portion, and the sealing cavity is used to cover the liquid injection hole and to close the liquid injection hole.

6. The battery casing repair device according to claim 5, characterized in that: The gas injection part is made of flexible material.

7. The battery casing repair device according to claim 1, characterized in that: The battery shell repair device has a first direction, a second direction and a third direction, and the third direction is perpendicular to the first direction and the second direction respectively. The battery shell repair device also includes a base, and the first limit member and the second limit member are arranged on the base at intervals along the third direction, and the first limit member or the second limit member is detachably connected to the base.

8. The battery casing repair device according to claim 7, characterized in that: The limiting assembly further includes a third connecting member, one end of the third connecting member along the third direction is connected to the first limiting member, and the other end of the third connecting member along the third direction is detachably connected to the second limiting member.

9. The battery casing repair device according to claim 8, characterized in that: The limiting assembly further includes a fixing member, which is disposed on the base. The first limiting member is connected to the fixing member, and one end of the third connecting member connected to the first limiting member is connected to the fixing member.

10. The battery casing repair device according to claim 7, characterized in that: The limiting assembly further includes a position adjustment member, and the battery casing repair device further includes a frame, the frame being disposed on the base, and the frame and the first limiting member being spaced apart along the third direction to define an adjustment space, the position adjustment member being disposed within the adjustment space, and the position adjustment member abutting against the first limiting member and the frame on both sides along the third direction, respectively; Wherein, the thickness of the position adjustment member along the third direction is adjustable.

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