Battery housing assembly and battery

Abstract

The utility model relates to battery structure technical field provides a kind of battery shell assembly and battery, above-mentioned battery shell assembly includes shell, and shell has inner cavity in it. The first side wall of shell is provided with and the exhaust hole of inner cavity intercommunication, and the surface of the second side wall of shell is formed with convex structure. Convex structure extends along the direction perpendicular to the plane of first side wall. Second side wall is the adjacent side wall of first side wall. The battery shell assembly of the utility model, by constructing the convex structure extending along the direction perpendicular to the plane of first side wall on the second side wall adjoining with first side wall, convex structure can play the role of strengthening the rigidity of the second side wall of shell, keep the form of second side wall, to keep the clearance between second side wall and battery internal element, so that shell gas can flow to exhaust hole along the clearance and be discharged from shell.

Description

Technical Field

[0001] This utility model relates to the field of battery structure technology, and in particular to a battery casing assembly. Background Technology

[0002] In related technologies, when a battery is in use, the electrochemical reaction inside the battery will produce a certain amount of gas. In order to avoid excessive internal pressure and affect the normal operation of the battery, the gas needs to be discharged through the vent on the battery casing. The gas inside the battery mainly flows to the vent through the gap between the battery casing and the components inside the casing. After long-term use, the battery casing is prone to deformation. The deformed part of the casing may be in close contact with the components inside the casing (such as the electrode assembly) and block the gas passage between the gas inside the casing and the vent, affecting the normal venting of the battery. Utility Model Content

[0003] This utility model provides a battery casing assembly and a battery to solve the problem in the prior art where, after the battery casing is deformed, part of the casing may be tightly attached to the components inside the casing, thereby blocking the gas passage between the gas inside the casing and the vent hole, affecting the normal venting of the battery.

[0004] In a first aspect, this utility model provides a battery housing assembly, comprising: A housing having an inner cavity; a first sidewall of the housing having an exhaust port communicating with the inner cavity; and a raised structure formed on the surface of a second sidewall of the housing; the raised structure extending along a first direction; the first direction being perpendicular to the first sidewall; The second sidewall is the adjacent sidewall of the first sidewall.

[0005] According to the battery housing assembly of this utility model, the housing is a square housing, the second sidewall includes two third sidewalls and two fourth sidewalls, the third sidewalls are connected to the long side of the first sidewall in a one-to-one correspondence, and the fourth sidewalls are connected to the short side of the first sidewall in a one-to-one correspondence. The protruding structure is formed at least on the third sidewall.

[0006] According to the battery housing assembly of this utility model, there are multiple protrusion structures, and the multiple protrusion structures are respectively disposed on the third side wall and the fourth side wall; The plurality of protruding structures on the third sidewall are arranged at intervals along the long side of the first sidewall, and the plurality of protruding structures on the fourth sidewall are arranged at intervals along the short side of the first sidewall.

[0007] According to the battery housing assembly of the present invention, the third sidewall has a first axis of symmetry extending along the first direction, and the plurality of protrusions on the third sidewall are arranged symmetrically about the first axis of symmetry of the third sidewall. The fourth sidewall has a second axis of symmetry extending along the first direction, and the plurality of protrusions on the fourth sidewall are arranged axially symmetrically about the second axis of symmetry of the fourth sidewall.

[0008] According to the battery housing assembly of this utility model, the spacing between adjacent protrusions on the third sidewall along the length direction of the first sidewall is not less than 5mm. The spacing between adjacent protrusions on the fourth sidewall along the width direction of the first sidewall is not less than 5 mm.

[0009] According to the present invention, the battery housing assembly is a welded housing, a portion of the weld seam of the housing is formed on the inner side of the second sidewall, the protruding structure is formed on the inner side of the second sidewall having the weld seam, and the height of the protruding structure in the second direction is greater than the height of the weld seam on the inner side of the second sidewall in the second direction. The second direction is perpendicular to the protruding structure and the second sidewall where the weld is located.

[0010] According to the battery housing assembly of this utility model, the height of the protrusion structure in the second direction is not less than 1.5 times the height of the weld in the second direction and does not exceed 10 times the height of the weld in the second direction.

[0011] According to the battery housing assembly of this utility model, the protruding structure is a rectangular structure or a wavy structure.

[0012] According to the present invention, the battery housing assembly includes a lower housing and a cover plate. The lower housing is open, and the cover plate is installed in the opening of the lower housing. The lower housing and the cover plate together form the inner cavity. The vent is located on the cover plate, and the protruding structure is formed on the lower housing.

[0013] Secondly, this utility model also provides a battery, comprising: an electrode assembly and a battery casing assembly as described in any one of the above claims; The electrode assembly is installed in the inner cavity of the housing.

[0014] The battery casing assembly of this invention has an exhaust port on the first side wall of the casing that communicates with the inner cavity, so that gas generated inside the casing can be discharged through the exhaust port when needed. At the same time, by constructing a protruding structure on the second side wall adjacent to the first side wall, extending in a direction perpendicular to the plane of the first side wall, the protruding structure can enhance the rigidity of the second side wall of the casing, maintain the shape of the second side wall, and thus maintain the gap between the second side wall and the internal components of the battery, so that the gas inside the casing can flow along the gap to the exhaust port and be discharged from the casing. This effectively solves the problem in the prior art that after the battery casing is deformed, part of the casing may be tightly attached to the components inside the casing, thereby blocking the gas passage between the gas inside the casing and the exhaust port, affecting the normal venting of the battery. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0016] Figure 1 This is a cross-sectional view of the shell provided in an embodiment of this utility model.

[0017] Figure 2 This is a cross-sectional view of the housing provided in another embodiment of the present invention.

[0018] Figure 3 This is a schematic diagram of the lower housing provided in an embodiment of the present utility model.

[0019] Figure 4 This is a schematic diagram of the lower housing provided in another embodiment of the present invention.

[0020] Figure 5 This is a partial cross-sectional view of the shell provided in an embodiment of the present invention.

[0021] Figure label: 1. Shell; 11. Inner cavity; 12. Second side wall; 121. Protruding structure; 122. Third side wall; 123. Fourth side wall; 13. Weld; 14. Lower shell. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0023] The following is combined Figures 1-5 This invention describes the battery housing assembly.

[0024] like Figure 1 and Figure 2 As shown, this utility model provides a battery housing assembly, including a housing 1, with an inner cavity 11 inside the housing 1. A first sidewall (not shown) of the housing 1 is provided with a vent (not shown) communicating with the inner cavity 11. A protruding structure 121 is formed on the surface of a second sidewall 12 of the housing 1. The protruding structure 121 extends along a first direction; the first direction is perpendicular to the plane of the first sidewall. The second sidewall 12 is an adjacent sidewall of the first sidewall.

[0025] In this embodiment, an inner cavity 11 is formed inside the housing 1. The inner cavity 11 is used to accommodate the internal components of the battery (such as electrode assembly) and electrolyte. An exhaust hole communicating with the inner cavity 11 is opened on the first sidewall of the housing 1 so that the gas produced inside the battery can be connected through the exhaust hole when needed. It is understood that some of the gas produced inside the battery needs to flow to the exhaust hole through the gap between the adjacent sidewall of the first sidewall (i.e., the second sidewall 12) and the internal components. In this embodiment, a protrusion structure 121 extending in a direction perpendicular to the plane of the first sidewall is constructed on the second sidewall 12 of the housing 1 to enhance the rigidity of the second sidewall 12 of the housing 1, and to prevent the second sidewall 12 from bending and deforming relative to the direction perpendicular to the plane of the first sidewall, thus avoiding it from sticking tightly to the internal components, blocking the gas passage between the gas inside the housing and the exhaust hole, and affecting the normal exhaust of the battery.

[0026] The battery casing assembly of this invention has an exhaust hole on the first side wall of the casing 1 that communicates with the inner cavity 11, so that gas generated inside the casing can be discharged through the exhaust hole when needed. At the same time, by constructing a protrusion structure 121 extending in a direction perpendicular to the plane of the first side wall on the second side wall 12 adjacent to the first side wall, the protrusion structure 121 can strengthen the rigidity of the second side wall 12 of the casing 1, maintain the shape of the second side wall 12, and thus maintain the gap between the second side wall 12 and the internal components of the battery, so that the gas inside the casing can flow along the gap to the exhaust hole and be discharged from the casing 1. This effectively solves the problem in the prior art that after the battery casing is deformed, part of the casing may be tightly attached to the components inside the casing, thereby blocking the gas passage between the gas inside the casing and the exhaust hole, affecting the normal venting of the battery.

[0027] It is understood that the protrusion structure 121 can be formed on the side of the second sidewall 12 facing the inner cavity 11 (e.g. Figure 1 (as shown) or the side opposite to the inner cavity 11 (such as Figure 2 (As shown).

[0028] Optionally, the protruding structure 121 can be a solid structure or a hollow structure. For example... Figure 1 As shown, when the protruding structure 121 is a hollow structure and is formed on the side of the second sidewall 12 facing the inner cavity 11, the hollow structure is connected to the external environment of the battery; as Figure 2 As shown, when the protrusion 121 is a hollow structure and is formed on the side of the second sidewall 12 away from the inner cavity 11, the cavity of the hollow structure and the inner cavity 11 are connected; in.

[0029] Specifically, in some embodiments, such as Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the shell 1 is a square shell, and the second sidewall 12 includes two third sidewalls 122 and two fourth sidewalls 123. The third sidewalls 122 are connected to the long sides of the first sidewalls one by one, and the fourth sidewalls 123 are connected to the short sides of the first sidewalls one by one. The protruding structure 121 is formed at least on the third sidewall 122.

[0030] In this embodiment, the housing 1 is a square housing, suitable for square battery cells. The housing 1 has six sidewalls, each of which is rectangular or square. Taking a rectangular sidewall as an example, the second sidewall 12 adjacent to the first sidewall includes four sidewalls, specifically two third sidewalls 122 adjacent to the long side of the first sidewall and two fourth sidewalls 123 adjacent to the short side of the first sidewall. It can be understood that the area of ​​the third sidewall 122 is obviously larger than that of the fourth sidewall 123, and the stiffness of the third sidewall 122 is lower than that of the fourth sidewall 123, making it more prone to deformation. In this embodiment, the protruding structure 121 is provided at least in the third sidewall 122 to enhance the stiffness of the more easily deformable third sidewall 122 and prevent the third sidewall 122 from deforming. The fourth sidewall 123 is less prone to deformation than the third sidewall 122. The protrusion structure 121 can be provided or not provided as needed. Not providing the protrusion structure 121 can save the processing time of the entire shell 1. Providing the protrusion structure 121 requires additional processing of the fourth sidewall 123, but it can effectively prevent the fourth sidewall 123 from deforming.

[0031] It is understandable that if the first sidewall is a square, then the areas of the third sidewall 122 and the fourth sidewall 123 are equal, and a protruding structure 121 can be constructed on the third sidewall 122 and / or the fourth sidewall 123 as needed.

[0032] In some embodiments, such as Figures 1 to 4 As shown, there are multiple protrusions 121, which are respectively disposed on the third sidewall 122 and the fourth sidewall 123. Among them, the multiple protrusions 121 on the third sidewall 122 are arranged at intervals along the long side of the first sidewall, and the multiple protrusions 121 on the fourth sidewall 123 are arranged at intervals along the short side of the first sidewall.

[0033] In this embodiment, by constructing a plurality of protrusions 121 on the third sidewall 122, and by arranging the plurality of protrusions 121 at intervals along the long side of the first sidewall, when the third sidewall 122 is subjected to force and has a tendency to bend and deform, the plurality of protrusions 121 can disperse the force and resist the bending and deformation tendency of the third sidewall 122, which is beneficial to improving the resistance of the third sidewall 122 to deformation; similarly, by constructing a plurality of protrusions 121 at intervals along the short side of the first sidewall on the fourth sidewall 123, the resistance of the fourth sidewall 123 to deformation can also be improved.

[0034] In some embodiments, such as Figures 1 to 4As shown, the third sidewall 122 has a first axis of symmetry extending along a first direction, and a plurality of protrusions 121 on the third sidewall 122 are arranged axially symmetrically about the first axis of symmetry of the third sidewall 122. The fourth sidewall 123 has a second axis of symmetry extending along a first direction, and a plurality of protrusions 121 on the fourth sidewall 123 are arranged axially symmetrically about the second axis of symmetry of the fourth sidewall 123.

[0035] It is understood that both the third sidewall 122 and the fourth sidewall 123 are rectangular sidewalls, and both are axisymmetric structures. The third sidewall 122 has a first axis of symmetry extending along a first direction, and the fourth sidewall 123 has a second axis of symmetry extending along the first direction. In this embodiment, by arranging the multiple protruding structures 121 on the third sidewall 122 symmetrically about the first axis of symmetry of the third sidewall 122, the stress distribution of the protruding structures 121 on the third sidewall 122 is symmetrical and uniform. When the third sidewall 122 is subjected to an external load, the symmetrical protruding structures 121 can cooperate to share the stress, avoid local stress concentration, and thus effectively suppress the deformation of the third sidewall 122. Similarly, by arranging the multiple protruding structures 121 on the fourth sidewall 123 symmetrically about the second axis of symmetry of the fourth sidewall 123, the deformation of the fourth sidewall 123 can also be suppressed more effectively.

[0036] It is understandable that the number of protrusions 121 on the third sidewall 122 or the fourth sidewall 123 can be even or odd. For example... Figures 1 to 3 As shown, the third sidewall 122 is provided with an odd number of protrusions 121, one of which extends along the first axis of symmetry of the third sidewall 122, and the remaining even number of protrusions 121 are arranged in pairs, with each pair of protrusions 121 arranged symmetrically about the first axis of symmetry of the third sidewall 122; the fourth sidewall 123 is provided with an even number of protrusions 121, which are arranged in pairs, with each pair of protrusions 121 arranged symmetrically about the second axis of symmetry of the fourth sidewall 123.

[0037] Specifically, in some embodiments, the spacing between adjacent protrusions 121 on the third sidewall 122 along the length direction of the first sidewall is not less than 5 mm; the spacing between adjacent protrusions 121 on the fourth sidewall 123 along the width direction of the first sidewall is not less than 5 mm.

[0038] It is understandable that the length direction of the first sidewall is parallel to the long side of the first sidewall, and the width direction of the first sidewall is parallel to the wide side of the first sidewall.

[0039] In this embodiment, by reasonably setting the spacing between adjacent protrusions 121, the number and distribution of protrusions 121 on each sidewall are made more reasonable. When the corresponding sidewall is subjected to external load, the symmetrical protrusions 121 can share the stress in concert, avoid local stress concentration, and thus effectively suppress the deformation of the corresponding sidewall.

[0040] It is understood that the shell 1 can be an extruded shell without welds, or it can be a shell with welds formed by welding multiple parts.

[0041] Specifically, in some embodiments, such as Figure 5 As shown, the shell 1 is a welded shell, and a portion of the weld 13 of the shell 1 is formed on the inner side of the second sidewall 12. A protruding structure 121 is formed on the inner side of the second sidewall 12 with the weld 13. The height of the protruding structure 121 in the second direction is greater than the height of the weld 13 on the inner side of the second sidewall 12 in the second direction. The second direction is perpendicular to the second sidewall where the protruding structure 121 and the weld 13 are located.

[0042] In this embodiment, the housing 1 is welded from multiple structural components. Through reasonable structural component design, the weld 13 between the structural components can be located on the second side wall 12 of the housing 1. The weld 13 will form a protruding structure on the inner and outer sides of the second side wall 12. In this embodiment, the protruding structure 121 is set on the inner side of the second side wall 12 and on the same side as the weld 13. It can be understood that the height of the protruding structure 121 in the second direction is the distance between the point or surface on the protruding structure 121 that is farthest from the surface of the side wall and the surface of the side wall. The height of the weld 13 in the second direction is the distance between the point or surface on the weld 13 that is farthest from the surface of the side wall and the surface of the side wall. In this embodiment, by setting the height of the protruding structure 121 to be greater than the height of the weld 13 on the inner side of the second side wall 12, the protruding structure 121 can abut against the internal components (usually pole groups), limit the internal components, and prevent the internal components from contacting the weld 13, thereby preventing the internal components from being cut by the sharp structure on the weld 13.

[0043] Furthermore, in some embodiments, the height of the protrusion 121 in the second direction is not less than 1.5 times the height of the weld 13 in the second direction and does not exceed 10 times the height of the weld 13 in the second direction. In this embodiment, by limiting the height range of the protrusion 121, the protrusion 121 can better limit the internal components, ensuring that the internal components do not contact the weld 13, and can better improve the rigidity of the sidewall, avoiding bending deformation of the sidewall.

[0044] Optionally, the protruding structure 121 can be a rectangular structure or a wavy structure. Alternatively, the protruding structure 121 can also be other structures, as long as the strength and aesthetics of the sidewall are guaranteed.

[0045] In some embodiments, such as Figure 3 and Figure 4 The housing 1 shown includes a lower housing 14 and a cover plate (not shown in the figure). The lower housing 14 is open, and the cover plate is installed in the opening of the lower housing 14. The lower housing 14 and the cover plate together form an inner cavity 11. An exhaust port is provided on the cover plate, and a protruding structure 121 is formed on the lower housing 14.

[0046] In this embodiment, by dividing the housing 1 into a lower housing 14 and a cover plate, it is convenient to assemble the battery. Specifically, when assembling the battery, the internal components can be inserted into the lower housing 14 through the opening of the lower housing 14 first, and then the cover plate can be installed on the lower housing 14 to form a complete and closed housing 1.

[0047] It is understood that in some embodiments, the lower housing 14 has an opening at each end, with the cover plate and the opening corresponding one-to-one; or, the lower housing 14 may also have an opening on one side (e.g., Figure 4 (As shown).

[0048] Optionally, a single protrusion structure 121 may extend from one end of the sidewall to the other end, or the single protrusion structure 121 may also include multiple spaced segmented structures, which is not limited in this invention.

[0049] Secondly, this utility model also provides a battery, comprising: an electrode assembly and a battery housing assembly provided in any of the above embodiments. The electrode assembly is installed in the inner cavity 11 of the housing 1. The battery of this utility model, by adopting the battery housing assembly of the above embodiments, also has the advantages of the above-described battery housing assembly, which will not be elaborated further here.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A battery casing assembly, characterized in that, include: The housing has an inner cavity; the first sidewall of the housing is provided with an exhaust hole communicating with the inner cavity, and the surface of the second sidewall of the housing is formed with a protruding structure; The protruding structure extends along a first direction; The first direction is perpendicular to the first sidewall; The second sidewall is the adjacent sidewall of the first sidewall.

2. The battery casing assembly according to claim 1, characterized in that, The shell is a square shell, and the second sidewall includes two third sidewalls and two fourth sidewalls. The third sidewalls are connected to the long sidewalls of the first sidewalls in a one-to-one correspondence, and the fourth sidewalls are connected to the short sidewalls of the first sidewalls in a one-to-one correspondence. The protruding structure is formed at least on the third sidewall.

3. The battery casing assembly according to claim 2, characterized in that, There are multiple protruding structures, and the multiple protruding structures are respectively disposed on the third side wall and the fourth side wall; The plurality of protrusions on the third sidewall are arranged at intervals along the long side of the first sidewall, and the plurality of protrusions on the fourth sidewall are arranged at intervals along the short side of the first sidewall.

4. The battery casing assembly according to claim 3, characterized in that, The third sidewall has a first axis of symmetry extending along the first direction, and the plurality of protrusions on the third sidewall are arranged axially symmetrically about the first axis of symmetry of the third sidewall. The fourth sidewall has a second axis of symmetry extending along the first direction, and the plurality of protrusions on the fourth sidewall are arranged axially symmetrically about the second axis of symmetry of the fourth sidewall.

5. The battery housing assembly according to claim 4, characterized in that, The spacing between adjacent protrusions on the third sidewall along the length of the first sidewall is not less than 5 mm; The spacing between adjacent protrusions on the fourth sidewall along the width direction of the first sidewall is not less than 5 mm.

6. The battery housing assembly according to claim 1, characterized in that, The shell is a welded shell, and a portion of the weld seam of the shell is formed on the inner side of the second sidewall. The protruding structure is formed on the inner side of the second sidewall with the weld seam, and the height of the protruding structure in the second direction is greater than the height of the weld seam on the inner side of the second sidewall in the second direction. The second direction is perpendicular to the protruding structure and the second sidewall where the weld is located.

7. The battery housing assembly according to claim 6, characterized in that, The height of the protrusion in the second direction is not less than 1.5 times the height of the weld in the second direction and does not exceed 10 times the height of the weld in the second direction.

8. The battery housing assembly according to claim 1, characterized in that, The protruding structure is a rectangular structure or a wavy structure.

9. The battery casing assembly according to claim 1, characterized in that, The housing includes a lower housing and a cover plate. The lower housing is open, and the cover plate is installed in the opening of the lower housing. The lower housing and the cover plate together form the inner cavity. The vent is located on the cover plate, and the protruding structure is formed on the lower housing.

10. A battery, characterized in that, include: The electrode assembly and the battery housing assembly as described in any one of claims 1 to 9; The electrode assembly is installed in the inner cavity of the housing.

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