Shell assembly of battery, battery and electric equipment

Abstract

The utility model provides a shell assembly of a battery, the battery and electric equipment, and relates to the technical field of batteries, the shell assembly comprises: a shell, the shell is provided with a top plate, and the top plate is provided with a mounting hole; the pole column is arranged in the mounting hole in a penetrating manner, and the pole column is configured to be in limiting fit with the top plate in the axial direction of the top plate; the insulating component is arranged between the pole and the top plate so as to separate the pole from the top plate, a protective film is formed on the outer surface of at least part of the structure, between the pole and the top plate, of the insulating component, and the melting point of the protective film is higher than that of the structure covered by the protective film. According to the shell assembly of the battery, the protective film is formed on the outer surface of at least part of the structure of the insulation assembly, and the melting point of the protective film is higher than that of the structure covered by the protective film, so that the overall insulation and heat resistance of the insulation assembly can be improved, and the safety of the battery is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery housing component, a battery and an electrical device. Background Art

[0002] With the development of social economy, more and more electrical equipment uses batteries as energy storage and supply devices, such as new energy vehicles. Among them, cylindrical batteries combined with CTC (Cell to Chassis, the electrode assembly is directly integrated into the vehicle chassis) technology can greatly improve the energy density of the entire pack. However, under CTC technology, the battery needs to use a steel shell, and the overall structural parts are heavy, so the battery often needs to be combined with high-energy-density positive and negative electrode materials to improve the energy density of the electrode assembly. In this context, it is particularly important to improve the safety performance of the electrode assembly.

[0003] When the electrode assembly is tested for short circuit, the temperature rise of the battery pole can usually reach 500-1000℃, which often causes the melting of the insulation components around the pole, resulting in sealing and insulation failure. Therefore, how to improve the insulation heat resistance of the insulation components is a technical problem that needs to be solved urgently. Utility Model Content

[0004] In view of the above problems, the utility model provides a battery shell assembly, a battery and an electrical device, which can improve the overall insulation and heat resistance performance of the insulation assembly and improve the sealing and safety of the battery.

[0005] The utility model provides a shell component of a battery, comprising: an outer shell, the outer shell having a top plate, the top plate being provided with a mounting hole; a pole, the pole being passed through the mounting hole, the pole being constructed to cooperate with the top plate along the axial limit of the top plate; an insulating component, the insulating component being arranged between the pole and the top plate to separate the pole and the top plate, a protective film being formed on the outer surface of at least a portion of the structure of the insulating component located between the pole and the top plate, the melting point of the protective film being higher than the melting point of the structure covered by the protective film.

[0006] According to the battery shell assembly of the utility model, a protective film is formed on the outer surface of at least part of the structure of the insulating assembly between the pole and the top plate, and the melting point of the protective film is higher than the melting point of the structure covered by the protective film, so that the insulation and heat resistance of the insulating assembly as a whole can be improved. In the event of a short circuit in the battery, the structure of the insulating assembly is prevented from melting, which causes the insulation seal to fail, thereby improving the safety of the battery, and the manufacturing process of other battery structures such as the outer shell and pole is not changed. In addition, compared with the solution of setting a film layer on the outer shell or pole in the related art, the solution of the present application can simplify the overall production process of the battery and improve production efficiency because the protective film is directly formed on the insulating assembly.

[0007] In some embodiments, the pole includes a connecting rod portion, which is inserted into the mounting hole; a first limiting portion, and a second limiting portion, wherein the first limiting portion and the second limiting portion are respectively located on opposite sides of the top plate and connected to the connecting rod portion, and the projections of the first limiting portion and the second limiting portion in a reference plane are larger than the projection of the mounting hole in the reference plane, and the reference plane is perpendicular to the axial direction of the pole, and the insulating component separates the first limiting portion from the top plate, and the second limiting portion from the top plate, respectively.

[0008] In some embodiments, the insulating assembly includes a first insulating member, at least a portion of the structure of the first insulating member is disposed between the outer surface of the pole and the top plate, the first insulating member includes a first substrate and a first protective film, the first protective film covers at least a portion of the surface of the first substrate that is in contact with the top plate and the pole, and the melting point of the first protective film is higher than that of the first substrate.

[0009] In some embodiments, the first substrate includes: a first insulating segment, which extends radially along the pole and is located between the first limiting portion and the outer surface of the top plate; and a second insulating segment, which extends axially along the pole and is located radially outside the first limiting portion; the first protective film covers the opposite side surfaces of the first insulating segment along the axial direction of the pole.

[0010] In some embodiments, the first protective film also covers a surface of the second insulating segment facing the first limiting portion.

[0011] In some embodiments, the first insulating section is radially spaced apart from the connecting rod portion to form a sealing gap, and the insulating assembly further includes: a sealing member disposed in the sealing gap.

[0012] In some embodiments, the inner wall surface of the first insulating section extends obliquely relative to the axis of the pole to form an escape space between the top plate and / or the first limiting portion, and the seal is an elastic member that deforms under the extrusion of the pole and the top plate and fills the escape space.

[0013] In some embodiments, the sealing member includes a second substrate and a second protective film, the second protective film covers the second substrate, and the melting point of the second protective film is higher than the melting point of the second substrate.

[0014] In some embodiments, the insulating assembly further includes: a second insulating member, at least a portion of the structure of the second insulating member is disposed between the second limiting portion and the inner surface of the top plate.

[0015] In some embodiments, the second insulating member includes a third substrate and a third protective film, the third substrate including: a first extension section, the first extension section extends along the radial direction of the pole, the first extension section is located between the second limiting portion and the inner surface of the top plate, and a second extension section, the second extension section extends along the axial direction of the pole, the second extension section is located between the outer wall of the connecting rod portion and the inner wall of the mounting hole; the third protective film at least covers the two side surfaces of the first extension section along the axial direction of the pole.

[0016] In some embodiments, the third protective film also covers the outer surface of the second extending segment.

[0017] In some embodiments, the shell includes a shell body and a composite coating, the shell body is cylindrical, and the composite coating covers the inner wall of the shell body.

[0018] In some embodiments, any one of the composite coating and the protective film is at least one of polyimide (PI) and aluminum oxide; and / or, any one of the composite coating and the protective film has a thickness of 5-20 μm.

[0019] The utility model also provides a battery, comprising: a battery shell assembly according to the first aspect of the utility model.

[0020] According to the battery of the utility model, by providing the shell assembly of the first aspect, since the insulation and heat resistance of the insulation assembly as a whole is improved, when a short circuit occurs in the battery, the structure of the insulation assembly can be prevented from melting, thereby improving the safety of the battery. In addition, since the protective film is directly formed on the insulation assembly, the manufacturing process of other battery structures such as the shell and the pole is not changed, the overall production process of the battery can be simplified and the production efficiency can be improved.

[0021] In some embodiments, the battery further comprises: a current collecting plate, the current collecting plate being disposed in the inner cavity of the shell, the current collecting plate being electrically connected to the pole, and at least one of the current collecting plate and the pole being provided with a fuse structure.

[0022] In some embodiments, the current collecting plate includes a first connecting portion, a second connecting portion and the fuse structure, the first connecting portion is connected to the electrode assembly of the battery, the second connecting portion is connected to the pole, and the fuse structure is respectively connected to the first connecting portion and the second connecting portion.

[0023] The utility model also provides an electrical device, comprising: the battery described in the second aspect of the utility model.

[0024] According to the electric device of the utility model, when the battery of the second aspect is adopted, the safety of the electric device can be improved and the user experience can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0026] Figure 1 It is a schematic diagram of the structure of batteries in some embodiments of the utility model;

[0027] Figure 2 sectional views of batteries according to some embodiments of the present invention;

[0028] Figure 3 for Figure 2 The middle circle shows a schematic structural diagram of an embodiment of the part A;

[0029] Figure 4 for Figure 2 The middle circle shows a schematic structural diagram of another embodiment of the part A;

[0030] Figure 5 for Figure 2 The middle circle shows a schematic structural diagram of another embodiment of the part A;

[0031] Figure 6 It is a schematic structural diagram of a current collecting plate of a battery according to some embodiments of the utility model.

[0032] Description of reference numerals:

[0033] 400-battery;

[0034] 100-housing assembly;

[0035] 1-housing; 11-top plate; 111-mounting hole;

[0036] 2-Insulation components;

[0037] 21-first insulating member; 211-first substrate; 212-first insulating section; 213-second insulating section; 214-first protective film;

[0038] 22-seal member; 221-second substrate; 222-second protective film;

[0039] 23-second insulating member; 231-third substrate; 232-first extension section; 233-second extension section; 234-third protective film;

[0040] 3-pole; 31-first limiting portion; 32-connecting rod portion; 33-second limiting portion;

[0041] 200-electrode assembly;

[0042] 300 - current collecting plate; 301 - first connecting portion; 302 - second connecting portion; 303 - fuse structure. DETAILED DESCRIPTION

[0043] In order to make the above-mentioned purposes, features and advantages of the embodiments of the present application more obvious and understandable, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work belong to the scope of protection of this application.

[0044] With the development of society, more and more electrical equipment uses batteries as energy storage and supply devices, such as new energy vehicles. Among them, cylindrical batteries combined with CTC (Cell to Chassis, the electrode assembly is directly integrated into the vehicle chassis) technology can greatly improve the energy density of the entire pack. However, due to the CTC technology, the battery needs to use a steel shell and the overall structural parts are heavy, so the battery often needs to be used with high-energy-density positive and negative electrode materials to improve the energy density of the electrode assembly. In this context, it is particularly important to improve the safety performance of the electrode assembly. When the electrode assembly is tested externally, the temperature rise of the battery pole can usually reach 500-1000°C, which often causes the melting of the insulating assembly around the pole, resulting in sealing and insulation failure. Therefore, how to improve the insulation heat resistance of the insulating assembly is a technical problem that needs to be solved urgently.

[0045] In view of this, an embodiment of the utility model provides a battery shell assembly, a battery and an electrical device, wherein a protective film is formed on the outer surface of at least a portion of the structure of the insulating assembly between the pole and the top plate, and the melting point of the protective film is higher than the melting point of the structure covered by the protective film. In this way, the overall insulation and heat resistance of the insulating assembly can be improved, and in the event of a short circuit in the battery, the structure of the insulating assembly is prevented from melting, which would cause failure of the insulating seal, thereby improving the safety of the battery, and the manufacturing process of other battery structures such as the outer shell, pole, etc. is not changed.

[0046] Reference below Figure 1-Figure 6 The housing assembly 100 of the battery 400 according to the embodiment of the present invention is described.

[0047] refer to Figure 2-Figure 5The housing assembly 100 of this embodiment can be used as the housing assembly 100 of the battery 400. The battery 400 can be a cylindrical battery 400, or can also be other types of batteries 400. The housing assembly 100 of this embodiment can include: a housing 1, a pole 3 and an insulating assembly 2.

[0048] The housing 1 may be cylindrical, and the housing 1 has a top plate 11, and a mounting hole 111 is provided on the top plate 11, and the mounting hole 111 may be used to mount the pole 3. For example, the housing 1 is cylindrical, and one end of the housing 1 along its own axial direction is open, and the open end may be used to load the electrode assembly 200 and other components of the battery 400, and the open end may be packaged by the bottom cover, and the end of the housing 1 along the axial direction opposite to the open end is the top plate 11. The pole 3 is penetrated through the mounting hole 111, and the pole 3 is configured to cooperate with the top plate 11 along the axial limit of the top plate 11 to ensure that the position of the pole 3 relative to the top plate 11 is fixed, and the pole 3 is used to connect the external circuit with the electrode assembly 200 in the housing 1, and here, the electrode assembly 200 may include a positive electrode sheet, a negative electrode sheet, and a separator between the positive electrode sheet and the negative electrode sheet, and the electrode assembly 200 may be formed by stacking the positive electrode sheet, the separator, and the negative electrode sheet in sequence and then winding them.

[0049] The insulating component 2 is arranged between the pole 3 and the top plate 11 to separate the pole 3 and the top plate 11, thereby avoiding internal short circuit of the battery 400. A protective film is formed on the outer surface of at least part of the structure of the insulating component 2 located between the pole 3 and the top plate 11. The protective film and the structure of the insulating component 2 covered by it are an integral structure. The melting point of the protective film is higher than the melting point of the structure covered by the protective film. In other words, the heat resistance of the protective film is stronger than the melting point of the structure it covers. In this way, when the battery 400 is short-circuited or abused, and the temperature of the pole 3 rises sharply, the protective film can protect its internal structure from melting, thereby improving the overall insulation and heat resistance of the insulating component 2, which is beneficial to ensuring the safety of the battery 400 and the circuit.

[0050] According to the shell assembly 100 of the battery 400 of the embodiment of the utility model, a protective film is formed on the outer surface of at least part of the structure of the insulating assembly 2 between the pole 3 and the top plate 11, and the melting point of the protective film is higher than the melting point of the structure covered by the protective film. In this way, the overall insulation and heat resistance of the insulating assembly 2 can be improved. In the event of a short circuit in the battery 400, the structure of the insulating assembly 2 is prevented from melting, which causes the insulation seal to fail, thereby improving the safety of the battery 400, and the manufacturing process of other structures of the battery 400 such as the outer shell 1, the pole 3, etc. is not changed. In addition, compared with the solution of setting a film layer on the outer shell 1 or the pole 3 in the related art, the solution of the present application can simplify the overall production process of the battery 400 and improve production efficiency because the protective film is directly formed on the insulating assembly 2.

[0051] In some embodiments, reference Figure 2-Figure 5 The pole 3 may include a connecting rod portion 32, a first limiting portion 31, and a second limiting portion 33. The connecting rod portion 32 is shaped to match the mounting hole 111, the connecting rod portion 32 is disposed through the mounting hole 111, the first limiting portion 31 and the second limiting portion 33 are respectively located on opposite sides of the top plate 11, and are respectively connected to both ends of the connecting rod portion 32, the projections of the first limiting portion 31 and the second limiting portion 33 in the reference plane are larger than the projections of the mounting hole 111 in the reference plane, and the reference plane is perpendicular to the axial direction of the pole 3, so that the stability of the axial limiting cooperation between the pole 3 and the top plate 11 can be improved through the cooperation of the first limiting portion 31 and the second limiting portion 33, and the structure is relatively simple and easy to implement.

[0052] Optionally, the pole 3 may be formed by a rivet. During the assembly process, the rivet is first passed through the mounting hole, and after the rivet is squeezed, deformed and expanded, the second limiting portion 33 is formed.

[0053] The insulating assembly 2 separates the first limiting portion 31 from the top plate 11 , and the second limiting portion 33 from the top plate 11 , respectively, to prevent an electrical connection between the pole 3 and the housing 1 , which would cause an internal short circuit in the battery 400 .

[0054] In some embodiments, in combination Figure 2-Figure 5 The insulating assembly 2 may include a first insulating member 21, at least part of which is disposed between the pole 3 and the outer surface of the top plate 11. For example, the first insulating member 21 may only separate the first limiting portion 31 and the side surface of the top plate 11 facing each other. In addition, the first insulating member 21 may also cover the side wall of the first limiting portion 31 to separate the first limiting portion 31 from the outer surface of the top plate 11 in multiple directions such as axial and radial directions, thereby improving the insulation performance. In this way, contact between the first limiting portion 31 and the housing 1 can be avoided. Of course, the present invention is not limited to this, and the specific structure of the first insulating member 21 may be reasonably selected according to actual needs.

[0055] The first insulating member 21 may include a first substrate 211 and a first protective film 214, wherein the first protective film 214 covers at least a portion of the surface of the first substrate 211 in contact with the top plate 11 and the pole 3, and the first protective film 214 has a higher melting point than the first substrate 211. In this way, even if the battery 400 has thermal runaway due to a short circuit or other reasons, the first protective film 214 can protect the first substrate 211, prevent the first substrate 211 from melting due to high temperature, and improve the sealing and safety of the first insulating member 21.

[0056] In some embodiments, reference Figure 3, the first substrate 211 may include a first insulating segment 212 and a second insulating segment 213. Specifically, the first insulating segment 212 extends along the radial direction of the pole 3, and the first insulating segment 212 is located between the first limiting portion 31 and the outer surface of the top plate 11, and the plane where the first insulating end is located may be parallel to the top plate 11, and the second insulating segment 213 extends along the axial direction of the pole 3, and the second insulating segment 213 is located radially outside the first limiting portion 31, that is, a part of the first substrate 211 is between the first limiting portion 31 and the top plate 11, and the other part is covered on the peripheral side of the first limiting portion 31, so that the pole 3 and the top plate 11 can be better separated.

[0057] The first protective film 214 covers the opposite side surfaces of the first insulating section 212 along the axial direction of the pole 3. In this way, even if a large amount of heat is generated inside the battery 400, the first protective film 214 on the outside of the first insulating section 212 can prevent the heat from diffusing outward from between the first limiting portion 31 and the top plate 11, thereby ensuring the sealing of the first insulating member 21.

[0058] In some embodiments, the first protective film 214 also covers the side surface of the second insulating segment 213 facing the first limiting portion 31. In this way, the first protective film 214 can provide all-round protection for the gap between the first substrate 211 and the first limiting portion 31 and the outer surface of the top plate 11, thereby improving the structural stability of the first insulating member 21 when the battery 400 is short-circuited and heated, and improving the safety of the battery 400.

[0059] Preferably, the first protective film 214 completely covers the outer surface of the first substrate 211. In this way, compared with the case where the first protective film 214 is only provided on a portion of the surface of the first substrate 211, it is necessary to control the molding position of the first protective film 214 during the processing technology. In this embodiment, since the first protective film 214 completely covers the first substrate 211, it is possible to omit the control of the molding position of the first protective film 214, thereby simplifying the molding process, improving production efficiency, and helping to reduce costs.

[0060] In some embodiments, in combination Figure 2-Figure 5 The first insulating section 212 can be radially spaced from the connecting rod portion 32. At this time, a sealing gap is formed in the radial direction between the first insulating section 212 and the connecting rod portion 32. The insulating assembly 2 can also include a sealing member 22, which is arranged in the sealing gap. By providing the sealing member 22, the sealing performance of the pole 3 can be improved. At the same time, when a large amount of heat accumulates inside the battery 400 due to a short circuit, the sealing member 22 can delay the heat from reaching the first insulating member 21, thereby further improving the safety of the battery 400.

[0061] In some embodiments, in combination Figure 2-Figure 5The inner wall surface of the first insulating segment 212 extends obliquely relative to the axis of the pole 3. Since the first insulating segment 212 is sleeved on the outer side of the connecting rod portion 32 of the pole 3, the inner wall surface of the first insulating segment 212 here refers to the surface of one side of the first insulating segment 212 along the radial direction and facing the connecting rod portion 32.

[0062] For example, Figure 3 Taking the case where the middle shell assembly 100 is placed vertically as an example, the inner wall surface of the first insulating section 212 can extend downwardly and radially outwardly relative to the axis of the pole 3; or, the inner wall surface of the first insulating section 212 can extend upwardly and radially outwardly relative to the axis of the pole 3; or, a part of the inner wall surface extends downwardly and radially outwardly relative to the axis of the pole 3, and the other part extends upwardly and radially outwardly relative to the axis of the pole 3, that is, the inner wall surface forms a V shape. In this way, an escape space can be formed between the inner wall surface of the first insulating section 212 and the top plate 11 and / or the first limiting portion 31. The seal 22 is an elastic member. The seal 22 is deformed under the extrusion of the pole 3 and the top plate 11, and fills the escape space, thereby fully ensuring the sealing around the pole 3.

[0063] In other possible embodiments, the inner wall surface of the first insulating segment 212 may be a non-planar surface, such as a curved surface; or, the inner wall surface of the first insulating segment 212 may be provided with a recessed structure. In this way, the first insulating member 21 has various structural forms and can accommodate the deformed and expanded part of the sealing member 22 during the assembly process.

[0064] In some embodiments, reference Figure 5 The sealing member 22 may include a second substrate 221 and a second protective film 222. The second protective film 222 covers the second substrate 221, and the melting point of the second protective film 222 is higher than that of the second substrate 221. In this way, when a large amount of heat is generated inside the battery 400 due to a short circuit or other reasons, the second protective film 222 can also protect the second substrate 221 and prevent the second substrate 221 from melting due to high temperature, thereby improving the sealing of the sealing member 22 and the safety of the battery 400. In addition, it can be understood that when the sealing member 22 is provided with the second protective film 222, it can cooperate with the first protective film 214 on the first insulating member 21 to prevent heat from diffusing to the outside, thereby improving the heat resistance and safety of the sealing component as a whole.

[0065] To further ensure the insulation between the pole 3 and the housing 1, in this embodiment, the insulating assembly 2 may also include: a second insulating member 23, at least part of the structure of the second insulating member 23 is arranged between the second limiting portion 33 and the inner surface of the top plate 11, for example, the second insulating member 23 may only separate the second limiting portion 33 and the side surface of the top plate 11 facing each other, in addition, the second insulating member 23 may also cover the side wall of the second limiting portion 33, so as to separate the second limiting portion 33 from the inner surface of the top plate 11 in multiple directions such as axial and radial directions, so as to improve the insulation performance. In this way, the contact between the second limiting portion 33 and the housing 1 can be avoided. Of course, the utility model is not limited to this, and the specific structure of the second insulating member 23 can be reasonably selected according to actual needs.

[0066] In some embodiments, reference Figure 4 and Figure 5 The second insulating member 23 may include a third substrate 231 and a third protective film 234. The third substrate 231 may include: a first extension section 232 and a second extension section 233. The first extension section 232 extends along the radial direction of the pole 3, and the first extension section 232 is located between the second limit portion 33 and the inner surface of the top plate 11. The second extension section 233 extends along the axial direction of the pole 3, and the second extension section 233 is located between the outer wall of the connecting rod portion 32 and the inner wall of the mounting hole 111. In this way, the second insulating member 23 can separate the second limit portion 33 from the inner surface of the top plate 11, and can separate the connecting rod portion 32 from the inner wall of the mounting hole 111. The third protective film 234 can also prevent the structure covered by it, that is, the third substrate 231, from shrinking at high temperature, causing the second insulating member 23 to rebound and reduce the sealing of the pole 3. By the cooperation between the first insulating member 21 , the second insulating member 23 and the sealing member 22 , the pole 3 and the top plate 11 can be completely separated to ensure the insulation between the pole 3 and the housing 1 , and to ensure the high temperature resistance of the insulation assembly 2 as a whole.

[0067] Optionally, the third protective film 234 at least covers the two side surfaces of the first extension section 232 along the axial direction of the pole 3. In this way, even if a large amount of heat is generated inside the battery 400, the second protective film 222 on the outside of the second insulating section 213 can prevent the heat from diffusing outward from between the second limiting portion 33 and the top plate 11, thereby improving the overall sealing and safety.

[0068] In some embodiments, the third protective film 234 also covers the outer surface of the second extension section 233. In this way, the second protective film 222 can provide all-round protection for the first substrate 211, improve the structural stability of the second insulating member 23 under the high-temperature state of the battery 400, and improve the safety of the battery 400. In addition, compared with the case where the third protective film 234 is only provided on part of the surface of the third substrate 231, it is necessary to control the forming part of the third protective film 234 in the processing technology. In this embodiment, since the third protective film 234 completely covers the third substrate 231, the control measures for the forming part of the third protective film 234 can be omitted, which simplifies the forming process, improves the production efficiency, and helps to reduce costs.

[0069] In some embodiments, the shell 1 may include a shell body and a composite coating, wherein the shell body is cylindrical and the composite coating covers the inner wall of the shell body. In this way, the heat resistance of the shell 1 itself can be improved, which is beneficial to improving the safety of the battery 400.

[0070] In some embodiments, any one of the composite coating and the protective film is at least one of polyimide (PI) and aluminum oxide, that is, the composite coating and the protective film can be made of the same material or different materials, and the utility model does not limit this. In this way, by using the heat-resistant material of the above material, it is helpful to improve the heat resistance of the shell assembly 100 as a whole, thereby improving the safety of the battery 400.

[0071] In some embodiments, the thickness of any one of the composite coating and the protective film is 5-20 μm.

[0072] For example, the thickness of the composite coating can be 5μm, 7μm, 10μm, 12μm, 15μm, 18μm or 20μm. In this way, it can avoid the situation where the thickness of the composite coating is too small, for example, less than 5μm, the thermal insulation ability is too poor, and the protection ability of the outer shell 1 is weak; it can also avoid the situation where the thickness of the composite coating is too large, for example, greater than 20μm, resulting in the composite coating occupying a large space inside the outer shell 1.

[0073] Accordingly, the thickness of the protective film (including the first protective film 214, the second protective film 222 and the third protective film 234) can be 5μm, 7μm, 10μm, 12μm, 15μm, 18μm or 20μm, so that it can avoid that the thickness of the protective film is too small, for example, less than 5μm, the thermal insulation ability is too poor, and the protection ability of the insulating component 2 is weak, and it can also avoid that the thickness of the protective film is too large, for example, greater than 20μm, resulting in a large space occupied by the protective film. Of course, the utility model does not limit the specific thickness of the composite coating and the protective film, and the thickness of the composite coating and the protective film can be reasonably selected within the above range according to actual needs.

[0074] In some embodiments, the housing 1 may be a steel housing, in other words, the battery 400 of this embodiment is a steel housing cylindrical battery 400. In this way, the housing assembly 100 has a high structural strength and can better protect the electrode assembly 200 inside.

[0075] In some embodiments, any one of the first substrate 211, the second substrate 221 and the third substrate 231 is a plastic part, so that the first insulating member 21, the sealing member 22 and the second insulating member 23 have a certain elastic deformation ability. During assembly, they can withstand the extrusion force from the housing 1 and the pole 3 and produce a certain degree of deformation to improve the sealing of the gap around the pole 3. At the same time, it is also easier to assemble.

[0076] The battery 400 according to the second embodiment of the present invention is described below.

[0077] Combination Figure 1-Figure 5 The battery 400 of this embodiment includes: an electrode assembly 200 and a shell assembly 100 of the battery 400 in the above embodiment.

[0078] The shell assembly 100 may define a housing cavity, and the electrode assembly 200 may be disposed in the housing cavity and electrically connected to the pole 3 , so that the electrode assembly 200 may be connected to an external circuit through the pole 3 to transmit current.

[0079] According to the battery 400 of the embodiment of the utility model, by providing the housing assembly 100 in the above embodiment, since the insulation and heat resistance performance of the insulation assembly 2 as a whole is improved, in the case of a short circuit in the battery 400, it is possible to avoid the structure of the insulation assembly 2 from melting, which would cause the insulation seal to fail, thereby improving the safety of the battery 400. In addition, since the protective film is directly formed on the insulation assembly 2, the overall production process of the battery 400 can be simplified, and the production efficiency can be improved.

[0080] In some embodiments, the battery 400 may further include a current collecting disk 300. Specifically, the current collecting disk 300 may be disposed in the inner cavity of the housing 1, the current collecting disk 300 is electrically connected to the pole 3, and at least one of the current collecting disk 300 and the pole 3 is provided with a fuse structure 303, which may automatically fuse when the heat inside the battery 400 reaches a predetermined temperature due to heat accumulation, so that even if a short circuit occurs in the battery 400, the circuit may be quickly disconnected, thereby avoiding thermal runaway of the battery 400.

[0081] In some embodiments, reference Figure 6The current collecting plate 300 may include a first connecting portion 301, a second connecting portion 302 and a fuse structure 303, wherein the first connecting portion 301 is connected to the electrode assembly 200 of the battery 400, the second connecting portion 302 is connected to the pole 3, and the fuse structure 303 is connected to the first connecting portion 301 and the second connecting portion 302 respectively. That is to say, when the battery 400 is in a normal state, the fuse structure 303 serves to connect the electrode assembly 200 side and the pole 3 side, and when a short circuit occurs in the battery 400, the fuse structure 303 can disconnect the connection between the electrode assembly 200 and the pole 3, thereby avoiding thermal runaway of the battery 400.

[0082] It is understandable that even when the fuse structure 303 is provided on the current collecting plate 300 , the housing assembly 100 of this embodiment can also provide a protective film for the insulating assembly 2 and a composite coating for the inner wall of the housing 1 .

[0083] The electrical equipment of the third embodiment of the utility model is described below.

[0084] The power-consuming equipment of this embodiment may be a new energy vehicle, a communication base station, an energy storage container, etc. The power-consuming equipment may include the battery 400 in the above-mentioned embodiment.

[0085] Specifically, the electrical device may include a device body and a battery 400. The device body is provided with a battery 400 compartment. The battery 400 compartment may be provided with a power supply interface. The battery 400 may be arranged in the battery 400 compartment and electrically connected to the power supply interface. In this way, the battery 400 can supply power to the electrical device.

[0086] According to the electric device of the embodiment of the utility model, when the battery 400 in the above embodiment is used, the safety of the electric device can be improved.

[0087] It should be noted that the embodiments represented by "one embodiment", "an embodiment", "an exemplary embodiment", "some embodiments", etc. mentioned in the specification may include specific features, structures or characteristics, but not every embodiment may include the specific features, structures or characteristics. In addition, such phrases do not necessarily refer to the same embodiment. In addition, when describing specific features, structures or characteristics in conjunction with an embodiment, it is within the knowledge of those skilled in the art to implement such features, structures or characteristics in conjunction with other embodiments that are explicitly or not explicitly described.

[0088] In general, terms should be understood, at least in part, by the context in which they are used. For example, the term "one or more" as used herein may be used to describe any feature, structure, or characteristic in a singular sense, or may be used to describe a combination of features, structures, or characteristics in a plural sense, depending, at least in part, on the context. Similarly, terms such as "a," "an," or "the" may also be understood to convey singular usage or to convey plural usage, depending, at least in part, on the context.

[0089] It should be easily understood that “on,” “above,” and “over” in the present disclosure should be interpreted in the broadest manner, so that “on” not only means “directly on something,” but also includes the meaning of “on something” with intervening features or layers therebetween, and “above” or “over” not only includes the meaning of “above” or “over,” but also may include the meaning of “above” or “over something” with no intervening features or layers therebetween (i.e., directly on something).

[0090] In addition, spatially relative terms, such as "below," "below," "beneath," "above," "above," etc., may be used herein for ease of description to describe the relationship of one element or feature relative to other elements or features as shown in the figures. Spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation shown in the figures. The device may have other orientations (rotated 90 degrees or at other orientations), and the spatially relative descriptors used herein may likewise be interpreted accordingly.

[0091] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery housing assembly, characterized in that: include: A housing, wherein the housing has a top plate, and the top plate is provided with a mounting hole; A pole, the pole is passed through the mounting hole, and the pole is configured to cooperate with the top plate in an axial limit manner of the top plate; An insulating component is arranged between the pole and the top plate to separate the pole and the top plate, and a protective film is formed on the outer surface of at least a portion of the structure of the insulating component located between the pole and the top plate, and the melting point of the protective film is higher than the melting point of the structure covered by the protective film.

2. The battery housing assembly according to claim 1, characterized in that: The pole comprises a connecting rod portion, and the connecting rod portion is passed through the mounting hole; a first limiting portion, and a second limiting portion, wherein the first limiting portion and the second limiting portion are respectively located on opposite sides of the top plate and connected to the connecting rod portion, the projections of the first limiting portion and the second limiting portion in a reference plane are larger than the projection of the mounting hole in the reference plane, and the reference plane is perpendicular to the axial direction of the pole, The insulating assembly separates the first limiting portion and the top plate, and the second limiting portion and the top plate respectively.

3. The battery housing assembly according to claim 2, characterized in that: The insulating assembly includes a first insulating member, at least a portion of which is disposed between the pole and an outer surface of the top plate. The first insulating member includes a first substrate and a first protective film, the first protective film covers at least a portion of a surface of the first substrate in contact with the top plate and the pole, and the first protective film has a higher melting point than the first substrate.

4. The battery housing assembly according to claim 3, characterized in that: The first substrate comprises: a first insulating section, the first insulating section extending in a radial direction of the pole, the first insulating section being located between the first limiting portion and an outer surface of the top plate, and A second insulating section, the second insulating section extending along the axial direction of the pole, and the second insulating section is located radially outside the first limiting portion; The first protective film covers two opposite side surfaces of the first insulating segment along the axial direction of the pole.

5. The battery housing assembly according to claim 4, characterized in that: The first protective film also covers a surface of the second insulating segment facing the first limiting portion.

6. The battery housing assembly according to claim 4, characterized in that: The first insulating section is spaced apart from the connecting rod portion in a radial direction to form a sealing gap. The insulating component further includes a sealing member, and the sealing member is arranged in the sealing gap.

7. The battery housing assembly according to claim 6, characterized in that: The inner wall surface of the first insulating section extends obliquely relative to the axis of the pole to form an escape space between the top plate and / or the first limiting portion. The sealing member is an elastic member, which is deformed under the pressure of the pole and the top plate and fills the avoidance space.

8. The battery housing assembly according to claim 6, characterized in that: The sealing member includes a second substrate and a second protective film, wherein the second protective film covers the second substrate, and the melting point of the second protective film is higher than the melting point of the second substrate.

9. The battery housing assembly according to claim 3, characterized in that: The insulating assembly further includes: a second insulating member, at least a portion of the structure of the second insulating member is disposed between the second limiting portion and the inner surface of the top plate.

10. The battery housing assembly according to claim 9, characterized in that: The second insulating member includes a third substrate and a third protective film, The third substrate comprises: a first extension section, the first extension section extending in the radial direction of the pole, the first extension section being located between the second limiting portion and the inner surface of the top plate, and A second extension section, the second extension section extending along the axial direction of the pole, the second extension section being located between the outer wall of the connecting rod portion and the inner wall of the mounting hole; The third protective film at least covers two side surfaces of the first extension section along the axial direction of the pole.

11. The battery housing assembly according to claim 10, characterized in that: The third protective film also covers the outer surface of the second extending section.

12. The battery housing assembly according to any one of claims 1 to 11, characterized in that: The shell comprises a shell body and a composite coating, the shell body is cylindrical, and the composite coating covers the inner wall of the shell body.

13. The battery housing assembly according to claim 12, characterized in that: Any one of the composite coating and the protective film is at least one of polyimide (PI) and aluminum oxide; and / or, The thickness of any one of the composite coating and the protective film is 5-20 μm.

14. A battery, characterized in that: include: A battery housing assembly according to any one of claims 1 to 13.

15. The battery according to claim 14, characterized in that Also includes: A current collecting disk is arranged in the inner cavity of the shell, the current collecting disk is electrically connected to the pole, and at least one of the current collecting disk and the pole is provided with a fuse structure.

16. The battery according to claim 15, characterized in that The current collecting plate includes a first connecting portion, a second connecting portion and the fuse structure, wherein the first connecting portion is connected to the electrode assembly of the battery, and the second connecting portion is connected to the pole. The fuse structure is connected to the first connection portion and the second connection portion respectively.

17. An electrical equipment, characterized in that: include: A battery according to any one of claims 14 to 16.

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