Shell device

Abstract

The utility model provides a shell device, which comprises a shell used for forming an in-shell space for placing a battery cell; the bottom plate is located in the in-shell space and abuts against the inner bottom face of the shell; the shell device is provided with a discharge flow channel used for discharging gas generated by the battery core out of the in-shell space; the guide flow channel is arranged between the shell and the bottom plate so as to guide gas generated by the battery cell to flow to the discharge flow channel; a first groove is formed in the inner bottom face of the shell so as to at least form part of the guiding flow channel. According to the shell device, the battery and the electric equipment disclosed by the invention, the guide flow channel is arranged in the in-shell space of the shell device, and the gas generated by the battery cell can be guided to the discharge flow channel and discharged out of the in-shell space, so that the technical problem that the gas pressure in the battery is too high and cannot be smoothly discharged is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field, concretely relates to a shell device. BACKGROUND

[0002] The battery of gas-electric separation will process the explosion-proof valve after the battery shell stamping forming, and the welding and air tightness detection procedures are increased in the process of processing the explosion-proof valve, wherein the heat generated in the welding process will affect the opening pressure of the explosion-proof valve, resulting in the increase of the opening pressure discreteness of different explosion-proof valves in the same production batch.

[0003] In the related art, an integrated explosion-proof valve is arranged on the shell, so that the welding process is avoided, and the opening pressure discreteness problem caused by welding is eliminated. However, since the integrated explosion-proof valve is mostly formed by stamping, the structure is relatively simple, and when the internal pressure of the battery is too high, the gas may not be smoothly discharged, which is not conducive to the release of the internal pressure of the battery. SUMMARY

[0004] The embodiment of the utility model provides a shell device, which can solve the technical problem of not being able to smoothly discharge when the internal pressure of the battery is high.

[0005] The embodiment of the utility model provides a shell device, which comprises:

[0006] A shell is used to form a shell inner space to place a battery cell;

[0007] A bottom plate is located in the shell inner space and abuts against the inner bottom surface of the shell;

[0008] The shell device has:

[0009] An exhaust flow channel is used for discharging the gas generated by the battery cell from the shell inner space;

[0010] A guide flow channel is arranged between the shell and the bottom plate to guide the gas generated by the battery cell to flow to the exhaust flow channel;

[0011] The inner bottom surface of the shell is provided with a first groove to form at least part of the guide flow channel.

[0012] In an embodiment, the bottom plate has a second groove, and the second groove is arranged at the edge of the surface of the bottom plate abutting against the shell;

[0013] The first groove and the second groove are oppositely arranged to form the guide flow channel.

[0014] In an embodiment, the ratio of the depth of the first groove to the thickness of the shell is in the range of 0.25 to 0.45;

[0015] The difference between the width of the bottom surface of the shell and the width of the first groove ranges from 4mm to 8mm;

[0016] The difference between the length of the bottom surface of the shell and the length of the first groove ranges from 6mm to 12mm.

[0017] In an embodiment, the width of the second groove is greater than the width of the first groove and less than half of the width of the bottom plate;

[0018] The length of the second groove is greater than or equal to 2mm and less than 1 / 3 of the length of the bottom plate.

[0019] In an embodiment, the shell device has a discharge state in which the discharge flow channel is opened by the gas pressure of the gas generated by the battery cell to discharge the gas in the inner space of the shell.

[0020] In an embodiment, the discharge flow channel and the shell are of an integral structure; or

[0021] The discharge flow channel is welded on the shell.

[0022] In an embodiment, the shell further has:

[0023] A third groove for forming the discharge flow channel;

[0024] The third groove is arranged at the center of the outer bottom surface of the shell and the length-width direction of the third groove is consistent with the length-width direction of the bottom surface of the shell.

[0025] In an embodiment, the ratio of the depth of the third groove to the thickness of the shell ranges from 0.05 to 0.74.

[0026] In an embodiment, the ratio of the width of the third groove to the width of the bottom surface of the shell ranges from 0.5 to 0.8;

[0027] The ratio of the length of the third groove to the length of the bottom surface of the shell ranges from 0.09 to 0.2.

[0028] In an embodiment, in the direction of the plane in which the bottom surface of the shell is located, the third groove has a plurality of branch flow channels, and each of the plurality of branch flow channels is connected to the center of the bottom surface of the shell.

[0029] The embodiment of the utility model has the advantages of:

[0030] In the embodiment of the utility model, by arranging the guide flow channel in the inner space of the shell device, the gas generated by the battery cell can be guided to the discharge flow channel and discharged from the inner space of the shell, thereby avoiding the technical problem that the internal pressure of the battery is too high and cannot be smoothly discharged. BRIEF DESCRIPTION OF DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort on the basis of these drawings.

[0032] Figure 1 is a cross-sectional schematic view of the shell device provided by the embodiment of the present application;

[0033] Figure 2 is a cross-sectional schematic view of the shell provided by the embodiment of the present application;

[0034] Figure 3 is a cross-sectional schematic view of the bottom plate provided by the embodiment of the present application;

[0035] Figure 4 is a structural schematic view of the internal bottom surface of the shell provided by the embodiment of the present application;

[0036] Figure 5 is a planar schematic view of the bottom plate provided by the embodiment of the present application;

[0037] Figure 6 is a three-dimensional schematic view of the shell provided by the embodiment of the present application;

[0038] Figure 7 is a structural schematic view of the external bottom surface of the shell provided by the embodiment of the present application;

[0039] Figure 8 is a cross-sectional schematic view of the battery provided by the embodiment of the present application;

[0040] Figure 9 is a three-dimensional schematic view of the electrical equipment provided by the embodiment of the present application.

[0041] Explanation of reference numerals in the drawings:

[0042] 1, electrical equipment; 10, battery; 100, shell device; 100a, shell space; 100b, discharge flow channel; 100c, guide flow channel; 110, shell; 111, first groove; 112, third groove; 112a, branch flow channel; 120, bottom plate; 121, second groove; 200, battery cell. DETAILED DESCRIPTION

[0043] The technical solutions in the embodiments of the present application will be clearly and completely described with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative efforts fall within the scope of the present application. In addition, it should be understood that the specific implementation described herein is only used to illustrate and explain the present application, and is not used to limit the present application. In the present application, the orientation words such as "upper" and "lower" generally refer to the upper and lower of the device in the actual use or working state, and specifically refer to the drawing direction in the drawings. The "inner" and "outer" refer to the outline of the device.

[0044] Referring to Figure 1 As shown in FIG. 1, a shell device 100 is provided, which has an inner shell space 100a, a discharge flow channel 100b and a guide flow channel 100c. The inner shell space 100a is used to place the battery cell 200. During use of the battery 10, the battery cell 200 will generate gas and swell. The discharge flow channel 100b is in communication with the inner shell space 100a through the guide flow channel 100c, that is, the discharge flow channel 100b is used to discharge the gas generated by the battery cell 200 from the inner shell space 100a, and the guide flow channel 100c is used to guide the gas generated by the battery cell 200 to flow to the discharge flow channel 100b.

[0045] As described above, during use of the battery 10, the battery cell 200 will generate gas and swell. In the related art, when the gas pressure in the battery 10 reaches a certain level, in order to avoid explosion of the battery 10, an explosion-proof valve is provided on the shell of the battery 10 to release pressure. However, these explosion-proof valves usually only have explosion-proof holes to discharge gas, and it is inevitable that the explosion-proof holes will be blocked to some extent when the battery cell 200 swells. The present application discharges the gas released by the battery cell 200 by providing the discharge flow channel 100b, and provides the guide flow channel 100c in the shell device 100 of the battery 10, so that the battery cell 200 does not contact the discharge flow channel 100b when it swells, and thus the gas generated by the battery cell 200 can be smoothly discharged without causing blockage.

[0046] Specifically, referring to Figure 1 As shown in FIG. 1, the shell device 100 includes a shell 110 and a bottom plate 120. The shell 110 is used to form the inner shell space 100a, and the bottom plate 120 is located in the inner shell space 100a. The guide flow channel 100c is formed between the shell 110 and the bottom plate 120.

[0047] It should be noted that in the complete battery 10, the cell 200 is located on the side of the base plate 120 away from the bottom surface of the casing 110. The guide channel 100c connects the internal space 100a where the cell 200 is located with the discharge channel 100b. The gas inlet of the guide channel 100c is located at the edge of the base plate 120, so that the cell 200 will not come into contact with the gas inlet.

[0048] In some embodiments of this application, the base plate 120 abuts against the bottom surface inside the housing 110, meaning that the formation of the guide channel 100c occupies a portion of the base plate 120 itself, rather than forming the guide channel 100c by increasing the thickness or structure of the base plate 120. This arrangement may minimize the space occupied inside the housing device 100. It is understood that in other embodiments of this application, a raised channel structure may be provided on the base plate 120 to connect the internal space 100a and the discharge channel 100b, or additional components may be placed between the bottom surface of the housing and the housing.

[0049] More specifically, in some embodiments of this application, reference is made to Figure 2 As shown, the housing 110 has a first groove 111 disposed on the bottom surface inside the housing 110 to at least partially form a guide channel 100c.

[0050] Reference Figure 3 As shown, the base plate 120 has a second groove 121, which is disposed on the edge of the side of the base plate 120 that abuts against the housing 110; wherein, the first groove 111 and the second groove 121 are disposed opposite to each other to form a guide channel 100c. Considering that providing grooves for forming the guide channel 100c only on the housing 110 or the base plate 120 would result in a limited volume of the final guide channel 100c, and forming a guide channel 100c with a sufficient volume might affect the strength of the base plate 120 itself, a longer first groove 111 is provided on the bottom surface inside the housing 110 to form the guide channel 100c connecting to the main body of the discharge channel 100b, and the second groove 121 is provided as a shorter groove. While maintaining the supporting strength of the base plate 120 itself, a portion of the first groove 111 and the second groove 121 located at the edge of the base plate 120 are merged to form the gas inlet portion of the guide channel 100c.

[0051] Reference Figure 4As shown, in some embodiments of the present application, the difference between the width of the bottom surface of the shell 110 and the width of the first groove 111 ranges from 4 mm to 8 mm, and the difference between the length of the bottom surface of the shell 110 and the length of the first groove 111 ranges from 6 mm to 12 mm. More specifically, in the field of batteries 10, the four side plates of the shell 110 are usually divided into a relatively small area of the shell 110 facet and a relatively large area of the shell 110 facet. In this embodiment, that is, in the length direction of the bottom surface of the shell 110, the distance between the first groove 111 and the small facet of the shell 110 is 3 mm to 6 mm, and specifically, it can be 3 mm, 4 mm, 4.5 mm, 5 mm, or 6 mm, etc. In the width direction of the bottom surface of the shell 110, the distance between the first groove 111 and the large facet of the shell 110 is 2 mm to 4 mm, and specifically, it can be 2 mm, 3 mm, or 4 mm. It should be noted that, in order to facilitate the formation of the guide flow channel 100c and ensure the strength of the bottom surface of the shell 110, the first groove 111 is arranged in a cross shape, and the width of the first groove 111 remains the same in the length or width direction of the bottom surface of the shell 110. In some embodiments, the ratio of the width of the first groove 111 to the width of the bottom surface of the shell 110 is 0.1 to 0.15. By setting the size of the first groove 111 as described above, the exhaust effect of the guide flow channel 100c can be ensured. If the size is small, the exhaust effect is poor, and if the size is large, the strength of the bottom surface of the shell 110 is low.

[0052] Referring to Figure 5 As shown, in some embodiments of the present application, the width of the second groove 121 is greater than the width of the first groove 111 and less than half the width of the bottom plate 120, and the length of the second groove 121 is greater than or equal to 2 mm and less than 1 / 3 of the length of the bottom plate 120. More specifically, the width of the second groove 121 remains the same in the length or width direction of the bottom plate 120. Referring to Figure 5 As shown, the difference between the width of the second groove 121 and the width of the first groove 111 is at least 2 mm. Corresponding to the cross-shaped first groove 111, the second groove 121 is also arranged on the four edges of the bottom plate 120 to ensure the communication between the guide flow channel 100c and the inner space 100a of the shell. On this basis, according to the different positions of the second groove 121, the length range of the second groove 121 can also be adjusted. Specifically, the length of the two second grooves 121 distributed along the length direction of the bottom plate 120 can range from 2 mm to 1 / 3 of the length of the bottom plate 120, and the length of the two second grooves 121 distributed along the width direction of the bottom plate 120 can range from 2 mm to 1 / 3 of the width of the bottom plate 120. Through the above scheme, the size of the second groove 121 will not be too small to affect the exhaust effect, and the size of the second groove 121 will not be too large to cause the strength of the bottom plate 120 to be insufficient, avoiding the middle of the bottom plate 120 collapsing during use to cause the exhaust to weaken.

[0053] It should be noted that in the above embodiments, the housing device 100 has a discharge channel 100b that is opened by the gas pressure generated by the cell 200 to allow gas to be discharged from the housing space 100a. Therefore, under normal use, the housing device 100 is in a closed state, and the discharge channel 100b will only open when the pressure inside the housing device 100 reaches a certain level. In some embodiments, the opening pressure of the discharge channel 100b can be set to 0.7 MPa to 2.3 MPa. It is understood that this opening pressure can also be set according to the specific needs of the battery 10, and this application does not limit it here.

[0054] In related technologies, the discharge channel 100b may be formed on the explosion-proof valve, and then the explosion-proof valve is welded to the housing 110. In some embodiments of this application, in addition to welding, the discharge channel 100b may also be an integral structure with the housing 110. It should be noted that the housing 110 is usually made of aluminum coil, and the thickness of the aluminum coil is generally set between 1.2 and 2.0 mm. Multiple grooves for forming the discharge channel 100b can be punched at a certain distance on the aluminum coil. Then the aluminum coil is divided so that each segment of the aluminum coil has a groove for forming the discharge channel 100b. Finally, the segmented aluminum coil is formed into the housing 110. At this time, the groove for forming the discharge channel 100b is formed on the bottom surface of the outer side of the housing 110.

[0055] Therefore, refer to Figure 6 As shown, in some embodiments of this application, the housing 110 further includes a third groove 112 for forming a discharge channel 100b. The third groove 112 is located at the center of the outer bottom surface of the housing 110, and its length and width directions are consistent with the length and width directions of the bottom surface of the housing 110. By providing a third groove 112 integral with the housing 110, the opening pressure of the discharge channel 100b during the welding process can be avoided, so that the opening pressure of different housing devices 100 in the same production batch is basically the same.

[0056] Reference Figure 6 As shown in (a), in some embodiments of this application, the shape of the third groove 112 can be varied. Specifically, in the plane direction where the bottom surface of the housing 110 is located, the third groove 112 can have multiple branch channels 112a, all of which are connected to the center of the bottom surface of the housing 110 to form a Y-shaped, I-shaped, cross-shaped, or star-shaped structure. (Refer to...) Figure 6(b)As shown, in some examples of the present application, the third groove 112 can also be a regular shape such as an ellipse or a circle. It should be noted that different shapes only have certain influence on the position of the initiation point at which the discharge flow channel 100b is opened, and do not have influence on the opening pressure of the discharge flow channel 100b, and therefore the shape of the third groove 112 is not limited in the present application, but it should be noted that no matter what the shape of the third groove 112 is, the length and width directions of the third groove 112 should be consistent with the length and width directions of the bottom surface of the shell 110, so as to avoid the influence of the deformation of the shell 110 on the discharge flow channel 100b when the battery cell expands.

[0057] Referring to Figure 7 As shown, in some embodiments of the present application, the ratio of the depth of the first groove 111 to the thickness of the shell 110 is in the range of 0.25 to 0.45, and the ratio of the depth of the third groove 112 to the thickness of the shell 110 is in the range of 0.05 to 0.74. By this setting, the desired burst value can be controlled. If the remaining wall thickness of the discharge flow channel 100b is too thick, the opening pressure will be too large and the pressure relief will not be timely. If the remaining wall thickness of the discharge flow channel 100b is too thin, the opening pressure will be too small and the valve will open too early in the battery cell manufacturing process.

[0058] More specifically, in some examples of the present application, the ratio of the width of the third groove 112 to the width of the bottom surface of the shell 110 is in the range of 0.5 to 0.8, and the ratio of the length of the third groove 112 to the length of the bottom surface of the shell 110 is in the range of 0.09 to 0.2. By this setting, the bottom surface of the shell 110 can have a certain structural strength to avoid easy deformation of the shell 110, and at the same time the discharge flow channel 100b can have a certain exhaust area.

[0059] On this basis, in some embodiments of the present application, the middle part of the first groove 111 can be an elliptical groove, and the periphery of the first groove 111 remains a cross-like shape. The outer dimensions of the elliptical part of the first groove 111 and the outer dimensions of the third groove 112 need to maintain a certain difference, i.e. the distance between any point on the edge of the third groove 112 and the nearest point on the edge of the first groove 111 on the plane of the bottom surface of the shell 110 needs to be maintained at 1mm to 3mm. By this setting, the guide flow channel 100c and the discharge flow channel 100b can both have a certain exhaust effect, and at the same time the bottom surface of the shell 110 can have a certain structural strength.

[0060] Referring to Figure 8 As shown, the shell device 100 of the present application can be applied to a battery 10 which includes a battery cell 200 and the aforementioned shell device 100. The battery 10 has all the beneficial effects of the aforementioned shell device, and the present application will not be described here.

[0061] In some embodiments of the present application, one or more compressible layers can be arranged in the battery cell 200, specifically, the battery cell 200 can include a plurality of cell packs, and the compressible layers can be arranged between two adjacent cell packs, when the internal pressure of the battery 10 increases, the cell packs will extrude the compressible layers, thereby effectively releasing the internal pressure of the battery 10. More specifically, the compressible layer can be a sponge layer, which has strong adsorption and can increase the storage performance of the electrolyte in the battery cell. During the use of the battery 10, the electrolyte in the sponge layer will be released due to the extrusion of the sponge layer caused by the swelling of the battery cell, thereby reducing the swelling force of the battery cell, and the released electrolyte can be used by the battery cell, which is beneficial to prolong the service life of the battery cell 200.

[0062] In addition, in the battery 10, a plurality of cell packs are packaged in batches and sequentially arranged in the shell device 100, which is well known in the art, therefore, the specific structure of the cell pack is not described in detail in the embodiments of the present application.

[0063] Referring to Figure 9 The shell device 100 or the battery 10 described above can also be applied to an electric device 1. The electric device 1 has all the beneficial effects of the shell device 100 or the battery 10 described above, and the present application will not be repeated here.

[0064] It should be noted that the electric device 1 can be a new energy vehicle, and the present application does not make specific limitations.

[0065] The embodiments of the present application have been described in detail above, and the principles and implementation modes of the present application have been described by applying specific examples. The above description of the embodiments is only used to help understand the method of the present application and its core idea; at the same time, for those skilled in the art, according to the idea of the present application, the specific implementation mode and application range will be changed, and the above description should not be understood as a limitation of the present application.

Claims

1. A housing device, characterized in that, include: The casing, used to create an internal space to house the battery cells; The base plate is located within the shell space and abuts against the bottom surface of the shell interior. The housing device has: A discharge channel is provided for discharging the gas generated by the battery cell from the internal space of the casing. A flow channel is provided between the housing and the base plate to guide the gas generated by the battery cell to the discharge channel; The bottom surface inside the housing is provided with a first groove to form at least part of the guide channel.

2. The housing device according to claim 1, characterized in that, The base plate has a second groove, which is disposed on the edge of the side of the base plate that abuts against the housing; The first groove and the second groove are arranged opposite to each other to form the guide channel.

3. The housing device according to claim 2, characterized in that, The ratio of the depth of the first groove to the thickness of the shell ranges from 0.25 to 0.45; The difference between the width of the bottom surface of the housing and the width of the first groove ranges from 4mm to 8mm; The difference between the length of the bottom surface of the housing and the length of the first groove ranges from 6 mm to 12 mm.

4. The housing device according to claim 3, characterized in that, The width of the second groove is greater than the width of the first groove but less than half the width of the base plate; The length of the second groove is greater than or equal to 2 mm and less than 1 / 3 of the length of the base plate.

5. The housing device according to claim 1, characterized in that, The housing device has a discharge state in which the discharge channel is opened by the gas pressure force of the gas generated by the battery cell to allow the gas to be discharged from the internal space of the housing.

6. The housing device according to claim 5, characterized in that, The discharge channel and the shell are an integral structure; or The discharge channel is welded to the housing.

7. The housing device according to claim 6, characterized in that, The housing also has: The third groove is used to form the discharge channel; The third groove is located at the center of the bottom surface of the outer shell and its length and width are consistent with the length and width of the bottom surface of the shell.

8. The housing device according to claim 7, characterized in that, The ratio of the depth of the third groove to the thickness of the shell ranges from 0.05 to 0.

74.

9. The housing device according to claim 8, characterized in that, The ratio of the width of the third groove to the width of the bottom surface of the housing ranges from 0.5 to 0.8; The ratio of the length of the third groove to the length of the bottom surface of the housing ranges from 0.09 to 0.

2.

10. The housing device according to any one of claims 7 to 9, characterized in that, In the plane direction where the bottom surface of the housing is located, the third groove has multiple branch channels, and all of the multiple branch channels are connected to the center of the bottom surface of the housing.

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