Battery case, battery, and battery pack

Abstract

The application provides a battery shell, a battery and a battery pack. The battery shell comprises a shell assembly and an insulating piece. The shell assembly comprises a shell and a cover plate connected to each other, and the shell and the cover plate enclose a cavity. The insulating piece is arranged on the side of the cover plate facing the cavity, and comprises a first outer circumferential surface arranged opposite to the shell. The shell comprises a first matching surface arranged opposite to the first outer circumferential surface. One of the first matching surface and the first outer circumferential surface is provided with a blocking part. The blocking part extends along the circumference of the insulating piece and abuts against the other one of the first matching surface and the first outer circumferential surface. The gap between the first matching surface of the shell and the first outer circumferential surface of the insulating piece can be sealed to a certain extent by the blocking part, the electrolyte in the cavity is blocked, and the problem that the welding position of the shell and the cover plate is corroded by the electrolyte due to the contact between the electrolyte in the cavity and the welding position of the shell and the cover plate is reduced.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to a battery casing, a battery, and a battery pack. Background Technology

[0002] A battery mainly includes a battery casing and a core package disposed within the battery casing. The battery casing includes an outer shell and a cover plate welded together, and the core package is disposed within the cavity formed by the outer shell and the cover plate.

[0003] In related technologies, the cavity also contains electrolyte. When the battery shakes, the electrolyte in the cavity can easily come into contact with the welded joints of the outer casing and the cover plate, causing the welded joints of the outer casing and the cover plate to be corroded by the electrolyte, which in turn causes the electrolyte inside the battery casing to leak out from the gap between the outer casing and the cover plate. Utility Model Content

[0004] The embodiments of this application provide a battery casing, a battery, and a battery pack, which can improve the technical problem that the weld seam between the outer shell and the cover plate of the battery casing is easily corroded by electrolyte, causing the electrolyte inside the battery casing to leak out from the gap between the outer shell and the cover plate.

[0005] In a first aspect, embodiments of this application provide a battery casing, comprising:

[0006] A housing assembly includes an interconnected housing and a cover plate, the housing and the cover plate enclosing a cavity;

[0007] An insulating element is disposed on the side of the cover plate facing the cavity, the insulating element including a first outer peripheral surface that is spaced apart from the outer shell;

[0008] The outer casing includes a first mating surface that is spaced apart from the first outer peripheral surface. One of the first mating surface and the first outer peripheral surface has a protruding blocking portion. The blocking portion extends circumferentially along the insulating member and abuts against the other of the first mating surface and the first outer peripheral surface.

[0009] In some embodiments, the blocking portion protrudes from the first outer peripheral surface, which makes the formation of the blocking portion more convenient and helps to reduce the production cost of the insulating component and the housing.

[0010] In some embodiments, the blocking portion is located on the edge of the first outer peripheral surface near the cover plate. This allows the blocking portion to be positioned close to the cover plate, reducing the size of the space between the blocking portion and the cover plate, preventing the space between the blocking portion and the cover plate from accommodating excessive electrolyte, and further reducing the risk of the electrolyte coming into contact with the welded joints of the cover plate and the outer casing.

[0011] In some embodiments, the width of the blocking portion along its protruding direction is A, and the thickness of the outer shell is E, wherein A / E ≥ 0.8. This allows the blocking portion to have a larger width, which is beneficial for improving the sealing fit between the blocking portion and the first mating surface of the outer shell, thereby reducing the risk of the electrolyte in the gap dislodging from the weld between the cover plate and the outer shell.

[0012] In some embodiments, the thickness of the blocking portion is greater than or equal to 0.01 mm in the distribution direction of the cover plate and the insulating member. This improves the sealing effect of the blocking portion and reduces the gap height between the first mating surface of the housing and the first outer peripheral surface of the insulating member on the side of the blocking portion away from the cover plate. This, in turn, reduces the height of the electrolyte contained in the gap on the side of the blocking portion away from the cover plate, thereby reducing the risk of the electrolyte in the gap detaching from the weld between the cover plate and the housing.

[0013] In some embodiments, the blocking portion extends in a ring shape along the circumference of the insulating member, thereby improving the blocking effect of the blocking portion on the electrolyte.

[0014] In some embodiments, a cavity is formed within the insulating member, and at least one flow-guiding port communicating with the cavity is opened on the first outer peripheral surface of the insulating member. The flow-guiding port is located on the side of the blocking portion away from the cover plate. This allows foreign matter within the gap between the first outer peripheral surface and the first mating surface to be guided into the cavity through the flow-guiding port, preventing long-term accumulation of foreign matter in the gap and thus reducing the blocking effect of the blocking portion on the electrolyte.

[0015] In some embodiments, the guide port is disposed near the blocking portion to guide foreign objects in the gap between the first outer peripheral surface and the first mating surface into the cavity as much as possible.

[0016] In some embodiments, the guide port extends from the blocking portion toward a direction away from the cover plate, such that the edge of the guide port near the blocking portion is flush with the surface of the blocking portion on the side away from the cover plate, so as to further improve the guiding effect of the guide port on foreign objects in the gap between the first outer peripheral surface and the first mating surface.

[0017] In some embodiments, a recessed groove is formed on the surface of the cavity near the cover plate. This groove allows foreign objects that have flowed into the cavity via the guide port to be contained, reducing the risk of foreign objects flowing back into the gap between the first outer peripheral surface and the first mating surface via the guide port.

[0018] In some embodiments, there are multiple guide ports, each communicating with the cavity, and the multiple guide ports are spaced apart circumferentially along the insulating member. Therefore, foreign matter within the gap between the first outer peripheral surface and the first mating surface can be guided into the cavity through the multiple guide ports, minimizing the risk of foreign matter remaining in the gap between the first outer peripheral surface and the first mating surface.

[0019] In some embodiments, the insulating member has a protrusion on the side opposite to the cover plate, and the cavity is formed within the protrusion. The flow guide is located on the side of the protrusion facing the first mating surface. This helps to reduce the thickness of the portion of the insulating member without the cavity, thereby reducing the amount of material used and lowering the cost of the insulating member.

[0020] In some embodiments, the cover plate includes a second outer peripheral surface, and the housing includes a second mating surface disposed opposite to the second outer peripheral surface;

[0021] An insulating layer is also provided between the second outer peripheral surface and the second mating surface to seal the gap between them. This insulating layer can block the electrolyte, further reducing the risk of the electrolyte coming into contact with the welded joints of the cover plate and the outer casing.

[0022] In some embodiments, the insulating layer includes a first coating layer disposed on the second mating surface and a second coating layer disposed on the second outer peripheral surface, wherein the surface of the first coating layer facing away from the outer casing abuts against the surface of the second coating layer facing away from the cover plate. This makes the installation of the insulating layer more convenient and improves the assembly efficiency of the battery casing.

[0023] In some embodiments, the thickness of the first coating is greater than or equal to 0.005 mm and less than or equal to 0.1 mm to give the first coating a better sealing effect; and / or, the thickness of the second coating is greater than or equal to 0.005 mm and less than or equal to 0.1 mm to give the second coating a better sealing effect.

[0024] In some embodiments, the insulating layer is spaced apart from the surface of the cover plate opposite to the insulating element. This allows for maintaining a certain distance between the insulating layer and the weld joint between the cover plate and the housing, preventing damage to the insulating layer during welding of the cover plate and the housing.

[0025] In some embodiments, the distance between the insulating element and the surface of the cover plate opposite to the insulating element is C, and the thickness of the cover plate is F, wherein 0.2 ≤ C / F ≤ 0.8, thereby maintaining a sufficient distance between the insulating layer and the weld between the cover plate and the outer shell, avoiding the influence of the welding process between the cover plate and the outer shell on the insulating layer. Simultaneously, this ensures a better sealing effect for the insulating layer.

[0026] In some embodiments, the second mating surface includes a first inclined surface, and the second outer peripheral surface includes a second inclined surface spaced apart from the first inclined surface. At least a portion of the insulating layer is located between the first inclined surface and the second inclined surface to seal the gap between the first inclined surface and the second inclined surface. Thus, when the cover plate and the housing are welded together, the first and second inclined surfaces can apply a certain clamping force to the insulating layer, resulting in a better sealing effect.

[0027] Secondly, embodiments of this application provide a battery, comprising:

[0028] A battery casing, as described above, includes an outer shell assembly and an insulating member. The outer shell assembly includes an outer shell and a cover plate connected to each other, the outer shell and the cover plate forming a cavity. The insulating member is disposed on the side of the cover plate facing the cavity, and the insulating member includes a first outer peripheral surface spaced apart from the outer shell. The outer shell includes a first mating surface spaced apart from the first outer peripheral surface. One of the first mating surface and the first outer peripheral surface has a protruding blocking portion, the blocking portion extending circumferentially along the insulating member and abutting against the other of the first mating surface and the first outer peripheral surface.

[0029] The core package is installed inside the receiving cavity of the battery casing.

[0030] Thirdly, embodiments of this application provide a battery pack including the battery as described above.

[0031] The beneficial effects of the embodiments of this application are as follows:

[0032] The battery casing provided in this application embodiment has a blocking portion protruding from one of the first mating surface of the outer shell and the first outer peripheral surface of the insulating member. The blocking portion extends circumferentially along the insulating member and abuts against the other of the first mating surface and the first outer peripheral surface. The blocking portion can seal the gap between the first mating surface of the outer shell and the first outer peripheral surface of the insulating member to a certain extent, thus blocking the electrolyte in the cavity. This helps to reduce the contact between the electrolyte in the cavity and the welded joint of the cover plate and the outer shell, which would lead to corrosion of the welded joint of the outer shell and the cover plate by the electrolyte, and consequently, leakage of the electrolyte in the battery casing from the gap between the outer shell and the cover plate. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 A schematic diagram of the structure of one embodiment of the battery provided in this application;

[0035] Figure 2 for Figure 1 A cross-sectional view along the AA direction;

[0036] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0037] Figure 4 for Figure 3 Enlarged view of point B in the middle;

[0038] Figure 5 This is a schematic diagram of the structure of an embodiment of the insulating component provided in this application.

[0039] Explanation of icon numbers;

[0040] 1-Battery; 10-Battery casing; 100-Cavity; 101-Casing assembly; 11-Casing; 111-First mating surface; 112-Second mating surface; 1121-First inclined surface; 1122-First extension surface; 12-Cover plate; 121-Second outer peripheral surface; 1211-Second inclined surface; 1212-Second extension surface; 13-Insulator; 131-First outer peripheral surface; 132-Blocking part; 133-Protrusion; 134-Cavity; 135-Sink; 136-Flow guide port; 14-Insulating layer; 141-First coating; 142-Second coating; 151-Positive electrode post; 152-Negative electrode post; 20-Core pack. Detailed Implementation

[0041] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of this application and are not intended to limit this application. In this application, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0042] This application provides a battery casing, a battery, and a battery pack. These will be described in detail below.

[0043] Figure 1 A schematic diagram of the structure of one embodiment of the battery provided in this application. Figure 2 for Figure 1 A cross-sectional view along the AA direction. Figure 3 for Figure 2 A magnified view of point A in the middle. (See image below.) Figure 1 and Figure 2 As shown, the battery includes a battery casing 10 and a core pack 20. The battery casing 10 includes a cavity 100, and the core pack 20 is installed within the cavity 100 of the battery casing 10. The battery casing 10 includes an outer shell assembly 101, which includes an outer shell 11 and a cover plate 12 connected to each other. The outer shell 11 and the cover plate 12 enclose the cavity 100. The battery casing 10 also includes an insulating member 13, which is disposed on the side of the cover plate 12 facing the cavity 100. The side of the insulating member 13 facing away from the cover plate 12 is used to abut against the core pack 20 to separate the core pack 20 from the cover plate 12. The cover plate 12 also has a positive terminal 151 and a negative terminal 152. The positive terminal 151 is connected to the positive tab (not shown) of the core pack 20, and the negative terminal 152 is connected to the negative tab (not shown) of the core pack 20.

[0044] In some embodiments, such as Figure 3 As shown, the insulating member 13 includes a first outer peripheral surface 131 that is spaced apart from the outer casing 11. The outer casing 11 includes a first mating surface 111 that is spaced apart from the first outer peripheral surface 131 of the insulating member 13. A blocking portion 132 may be protruded from one of the first mating surface 111 and the first outer peripheral surface 131. The blocking portion 132 extends circumferentially along the insulating member 13 and abuts against the other of the first mating surface 111 and the first outer peripheral surface 131.

[0045] The battery casing 10 provided in this application embodiment has a blocking portion 132 protruding from one of the first mating surface 111 of the outer casing 11 and the first outer peripheral surface 131 of the insulating member 13. The blocking portion 132 extends circumferentially along the insulating member 13 and abuts against the other of the first mating surface 111 and the first outer peripheral surface 131. The blocking portion 132 can seal the gap between the first mating surface 111 of the outer casing 11 and the first outer peripheral surface 131 of the insulating member 13 to a certain extent, blocking the electrolyte in the cavity 100. This helps to reduce the contact between the electrolyte in the cavity 100 and the welded joint of the cover plate 12 and the outer casing 11, which would cause the welded joint of the outer casing 11 and the cover plate 12 to be corroded by the electrolyte, and thus cause the electrolyte in the battery casing 10 to leak out from the gap between the outer casing 11 and the cover plate 12.

[0046] It should be noted that the blocking portion 132 can be made to protrude from the first outer peripheral surface 131 of the insulating member 13 and abut against the first mating surface 111 of the housing 11. Alternatively, the blocking portion 132 can also be made to protrude from the first mating surface 111 of the housing 11 and abut against the first outer peripheral surface 131 of the insulating member 13. Of course, the former makes the formation of the blocking portion 132 easier and helps to reduce the production cost of the insulating member 13 and the housing 11.

[0047] The first outer peripheral surface 131 and the first mating surface 111 are respectively along the thickness direction of the cover plate 12. Figure 3 The cover plate 12 extends in the vertical direction, and the first outer peripheral surface 131 extends circumferentially along the insulating member 13, while the first mating surface 111 extends circumferentially along the outer shell 11. A gap is formed between the first outer peripheral surface 131 and the first mating surface 111. The first outer peripheral surface 131 and the first mating surface 111 can be parallel or at a certain angle. In addition, the orientation of the first outer peripheral surface 131 and the first mating surface 111 is at a certain angle to the thickness direction of the cover plate 12.

[0048] In addition, such as Figure 5 As shown, the blocking portion 132 can be made to extend in a ring shape along the circumference of the insulating member 13, thereby improving the blocking effect of the blocking portion 132 on the electrolyte. Of course, the blocking portion 132 can also be made to extend in a non-ring shape along the circumference of the insulating member 13, which can also block the electrolyte to a certain extent and reduce the risk of the electrolyte coming into contact with the welded joints of the cover plate 12 and the outer shell 11.

[0049] In some embodiments, the blocking portion 132 may be located on the first outer peripheral surface 131 near the edge of the cover plate 12. This allows the blocking portion 132 to be positioned close to the cover plate 12, reducing the size of the space between the blocking portion 132 and the cover plate 12, preventing the space between the blocking portion 132 and the cover plate 12 from accommodating excessive electrolyte, and further reducing the risk of the electrolyte contacting the welded joints of the cover plate 12 and the outer casing 11.

[0050] Specifically, the surface of the blocking portion 132 facing the cover plate 12 can be flush with the surface of the insulating member 13 facing the cover plate 12. The surface of the blocking portion 132 facing the cover plate 12 is in contact with the surface of the cover plate 12 facing the insulating member 13.

[0051] In some embodiments, such as Figure 3 As shown, the width of the blocking portion 132 along its protruding direction is A, and the thickness of the outer shell 11 is E. The width A of the blocking portion 132 along its protruding direction and the thickness E of the outer shell 11 can satisfy: A / E ≥ 0.8. This allows the blocking portion 132 to have a larger width, which is beneficial for improving the sealing fit between the blocking portion 132 and the first mating surface 111 of the outer shell 11, thereby reducing the risk of the electrolyte in the gap dislodging from the weld between the cover plate 12 and the outer shell 11.

[0052] The ratio of the width A of the blocking part 132 along its protruding direction to the thickness E of the outer shell 11 can be 0.85, 0.91, 0.95, 1, etc., and is not limited here.

[0053] In some embodiments, the thickness H of the blocking portion 132 can be greater than or equal to 0.01 mm in the distribution direction of the cover plate 12 and the insulating member 13. This is beneficial to improve the sealing effect of the blocking portion 132 and reduce the gap height between the first mating surface 111 of the housing 11 and the first outer peripheral surface 131 of the insulating member 13 on the side of the blocking portion 132 away from the cover plate 12, thereby reducing the height of the electrolyte contained in the gap on the side of the blocking portion 132 away from the cover plate 12, thereby reducing the risk of the electrolyte in the gap detaching from the weld between the cover plate 12 and the housing 11.

[0054] In the distribution direction of the cover plate 12 and the insulating member 13, the thickness H of the blocking part 132 can be 0.02mm, 0.04mm, 0.05mm, 0.08mm, 0.1mm, etc., and there is no limitation here.

[0055] In some embodiments, such as Figure 3 and Figure 5 As shown, a cavity 134 can be formed within the insulating member 13. At least one flow-guiding port 136 communicating with the cavity 134 is opened on the first outer peripheral surface 131 of the insulating member 13. The flow-guiding port 136 is located on the side of the blocking portion 132 facing away from the cover plate 12. Therefore, foreign matter within the gap between the first outer peripheral surface 131 and the first mating surface 111 can be guided into the cavity 134 through the flow-guiding port 136, preventing long-term accumulation of foreign matter in the gap and thus reducing the blocking effect of the blocking portion 132 on the electrolyte.

[0056] The guide port 136 can be positioned close to the blocking part 132 to guide foreign objects in the gap between the first outer peripheral surface 131 and the first mating surface 111 into the cavity 134 as much as possible.

[0057] Specifically, the guide port 136 can be extended from the blocking part 132 in a direction away from the cover plate 12, so that the edge of the guide port 136 near the blocking part 132 is flush with the surface of the blocking part 132 on the side away from the cover plate 12, so as to further improve the guiding effect of the guide port 136 on foreign objects in the gap between the first outer peripheral surface 131 and the first mating surface 111.

[0058] In some embodiments, a recessed groove 135 may be formed on the surface of the cavity 134 near the cover plate 12. This allows the groove 135 to accommodate foreign objects that have been guided into the cavity 134 via the guide port 136, reducing the risk of foreign objects in the cavity 134 flowing back into the gap between the first outer peripheral surface 131 and the first mating surface 111 via the guide port 136.

[0059] Specifically, the distance from the bottom surface of the settling tank 135 to the surface of the insulating member 13 near the cover plate 12 is less than the distance from the edge of the guide port 136 near the cover plate 12 to the surface of the insulating member 13 near the cover plate 12.

[0060] In some embodiments, the number of guide ports 136 can be multiple, and the multiple guide ports 136 are respectively connected to the cavity 134, and the multiple guide ports 136 are arranged at intervals along the circumference of the insulating member 13. Thus, foreign objects in the gap between the first outer peripheral surface 131 and the first mating surface 111 can be guided into the cavity 134 through the multiple guide ports 136, thereby minimizing the risk of foreign objects remaining in the gap between the first outer peripheral surface 131 and the first mating surface 111.

[0061] In some embodiments, a protrusion 133 may be provided on the side of the insulating member 13 away from the cover plate 12, and a cavity 100 may be formed in the protrusion 133. A flow guide 136 is provided on the side of the protrusion 133 facing the first mating surface 111. This helps to reduce the thickness of the portion of the insulating member 13 where the cavity 100 is not provided, which helps to reduce the material used in the insulating member 13 and reduce the cost of the insulating member 13.

[0062] Specifically, there are two protrusions 133. The two protrusions 133 are located near both ends of the insulating member 13 along its length. The protrusions 133 have flow guides 136 on both sides along the width of the insulating member 13. The protrusions 133 also have flow guides 136 on the side of one protrusion 133 away from the other.

[0063] In some embodiments, such as Figure 4As shown, the cover plate 12 includes a second outer peripheral surface 121, and the outer shell 11 includes a second mating surface 112 opposite to the second outer peripheral surface 121. An insulating layer 14 may be provided between the second outer peripheral surface 121 of the cover plate 12 and the second mating surface 112 of the outer shell 11 to seal the gap between the second outer peripheral surface 121 and the second mating surface 112. Thus, the insulating layer 14 can block the electrolyte, further reducing the risk of the electrolyte coming into contact with the welded joints of the cover plate 12 and the outer shell 11.

[0064] The insulating layer 14 can include a first coating layer 141 disposed on the second mating surface 112 and a second coating layer 142 disposed on the second outer peripheral surface 121. The surface of the first coating layer 141 facing away from the outer casing 11 abuts against the surface of the second coating layer 142 facing away from the cover plate 12. This makes the installation of the insulating layer 14 more convenient and helps to improve the assembly efficiency of the battery casing 10.

[0065] In some embodiments, the thickness of the first coating 141 can be greater than or equal to 0.005 mm and less than or equal to 0.1 mm to give the first coating 141 a better sealing effect. The thickness of the first coating 141 can be 0.005 mm, 0.015 mm, 0.025 mm, 0.035 mm, 0.05 mm, 0.08 mm, etc., and there is no limitation on its origin.

[0066] Additionally, the thickness of the second coating 142 can be greater than or equal to 0.005 mm and less than or equal to 0.1 mm to ensure good sealing performance. The thickness of the second coating 142 can be 0.005 mm, 0.015 mm, 0.025 mm, 0.035 mm, 0.05 mm, 0.08 mm, etc., without limitation.

[0067] It should be noted that the thickness of both the first coating 141 and the second coating 142 can meet the above-mentioned thickness requirements, or one of the first coating 141 and the second coating 142 can meet the above-mentioned thickness requirements.

[0068] Alternatively, the insulation layer 14 can be a single layer or more layers of insulation material, as long as the insulation layer 14 located between the second mating surface 112 and the second outer peripheral surface 121 can have a good sealing effect.

[0069] In some embodiments, the insulating layer 14 and the surface of the cover plate 12 facing away from the insulating member 13 are spaced apart. This allows the insulating layer 14 to maintain a certain distance from the weld joint between the cover plate 12 and the housing 11, preventing damage to the insulating layer 14 during welding of the cover plate 12 and the housing 11.

[0070] The distance between the insulating component 13 and the surface of the cover plate 12 facing away from the insulating component 13 is C, and the thickness of the cover plate 12 is F. This distance C and the thickness F of the cover plate 12 satisfy the condition: 0.2 ≤ C / F ≤ 0.8. This ensures a sufficient distance between the insulating layer 14 and the weld joint between the cover plate 12 and the outer shell 11, preventing the insulating layer 14 from being affected by the welding process between the cover plate 12 and the outer shell 11. Simultaneously, it provides a better sealing effect for the insulating layer 14.

[0071] In some embodiments, the second mating surface 112 may include a first inclined surface 1121, and the second outer peripheral surface 121 may include a second inclined surface 1211 spaced apart from the first inclined surface 1121. At least a portion of the insulating layer 14 is located between the first inclined surface 1121 and the second inclined surface 1211 to seal the gap between them. Thus, when the cover plate 12 and the outer shell 11 are welded together, the first inclined surface 1121 and the second inclined surface 1211 can apply a certain clamping force to the insulating layer 14, resulting in a better sealing effect.

[0072] Specifically, the first inclined surface 1121 extends along the second mating surface 112 toward the second outer peripheral surface 121 and along the cover plate 12 toward the insulating member 13. The second inclined surface 1211 also extends along the second mating surface 112 toward the second outer peripheral surface 121 and along the cover plate 12 toward the insulating member 13. The second mating surface 112 further includes a first extension surface 1122 extending from the first inclined surface 1121 toward a direction away from the insulating member 13. The second outer peripheral surface 121 further includes a second extension surface 1212 extending from the second inclined surface 1211 toward a direction away from the insulating member 13, and the first extension surface 1122 and the second extension surface 1212 are spaced apart from each other. A portion of the insulating member 13 is sandwiched between the first extension surface 1122 and the second extension surface 1212.

[0073] This application also provides a battery, which includes a battery casing. The specific structure of the battery casing is as described in the above embodiments. Since this battery adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0074] The battery includes a battery casing 10 and a core pack 20. The battery casing 10 includes an outer shell assembly 101 and an insulating member 13. The outer shell assembly 101 includes an outer shell 11 and a cover plate 12 connected to each other, forming a cavity 100. The insulating member 13 is disposed on the side of the cover plate 12 facing the cavity 100, and includes a first outer peripheral surface 131 spaced apart from the outer shell 11. The outer shell 11 includes a first mating surface 111 spaced apart from the first outer peripheral surface 131. One of the first mating surface 111 and the first outer peripheral surface 131 has a protruding blocking portion 132, which extends circumferentially along the insulating member 13 and abuts against the other of the first mating surface 111 and the first outer peripheral surface 131. The core pack 20 is installed in the receiving cavity of the battery casing 10. The structure of the outer shell assembly 101 and the insulating member 13 of the battery casing 10 can be referred to the above embodiments, and will not be repeated here.

[0075] This application embodiment also provides a battery pack (not shown in the figure), which includes a battery. The specific structure of the battery is as described in the above embodiments. Since this battery pack adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0076] The embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A battery casing, characterized in that, include: A housing assembly includes an interconnected housing and a cover plate, the housing and the cover plate enclosing a cavity; An insulating element is disposed on the side of the cover plate facing the cavity, the insulating element including a first outer peripheral surface that is spaced apart from the outer shell; The outer casing includes a first mating surface that is spaced apart from the first outer peripheral surface. One of the first mating surface and the first outer peripheral surface has a protruding blocking portion. The blocking portion extends circumferentially along the insulating member and abuts against the other of the first mating surface and the first outer peripheral surface.

2. The battery casing as described in claim 1, characterized in that, The blocking part protrudes from the first outer peripheral surface.

3. The battery casing as described in claim 2, characterized in that, The blocking portion is located on the edge of the first outer peripheral surface near the cover plate.

4. The battery casing as described in claim 1, characterized in that, The width of the blocking part along its protruding direction is A, and the thickness of the outer shell is E, wherein A / E ≥ 0.

8.

5. The battery casing as described in claim 1, characterized in that, In the distribution direction of the cover plate and the insulating element, the thickness of the blocking portion is greater than or equal to 0.01 mm.

6. The battery casing as described in claim 1, characterized in that, The blocking portion extends in a ring shape along the circumference of the insulating member.

7. The battery casing as described in any one of claims 1 to 6, characterized in that, A cavity is formed inside the insulating component, and at least one flow guide is provided on the first outer peripheral surface of the insulating component, which communicates with the cavity. The flow guide is located on the side of the blocking portion away from the cover plate.

8. The battery casing as described in claim 7, characterized in that, The flow guide is located near the blocking part.

9. The battery casing as described in claim 8, characterized in that, The flow guide extends from the blocking portion in a direction away from the cover plate.

10. The battery casing as described in claim 7, characterized in that, The cavity has a recessed groove on the side of the cover plate.

11. The battery casing as claimed in claim 7, characterized in that, The number of flow guide ports is multiple, and each of the multiple flow guide ports is connected to the cavity. The multiple flow guide ports are arranged at intervals along the circumference of the insulating component.

12. The battery casing as claimed in claim 7, characterized in that, The insulating component has a protrusion on the side opposite to the cover plate, and the cavity is formed inside the protrusion. The flow guide is opened on the side of the protrusion facing the first mating surface.

13. The battery casing as described in any one of claims 1 to 6, characterized in that, The cover plate includes a second outer peripheral surface, and the outer shell includes a second mating surface disposed opposite to the second outer peripheral surface; An insulating layer is also provided between the second outer peripheral surface and the second mating surface to seal the gap between the second outer peripheral surface and the second mating surface.

14. The battery casing as described in claim 13, characterized in that, The insulating layer includes a first coating on the second mating surface and a second coating on the second outer peripheral surface, wherein the surface of the first coating opposite to the outer casing abuts against the surface of the second coating opposite to the cover plate.

15. The battery casing as described in claim 14, characterized in that, The thickness of the first coating is greater than or equal to 0.005 mm and less than or equal to 0.1 mm; and / or, the thickness of the second coating is greater than or equal to 0.005 mm and less than or equal to 0.1 mm.

16. The battery casing as described in claim 13, characterized in that, The insulating layer and the surface of the cover plate opposite to the insulating element are spaced apart.

17. The battery casing as claimed in claim 16, characterized in that, The distance between the insulating element and the surface of the cover plate opposite to the insulating element is C, and the thickness of the cover plate is F, wherein 0.2≤C / F≤0.

8.

18. The battery casing as claimed in claim 13, characterized in that, The second mating surface includes a first inclined surface, and the second outer peripheral surface includes a second inclined surface that is spaced apart from the first inclined surface. At least a portion of the insulating layer is located between the first inclined surface and the second inclined surface to seal the gap between the first inclined surface and the second inclined surface.

19. A battery, characterized in that, include: A battery casing, wherein the battery casing is the battery casing according to any one of claims 1 to 18; The core package is installed inside the receiving cavity of the battery casing.

20. A battery pack, characterized in that, Includes the battery as described in claim 19.

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