Cover plate assembly, battery shell, battery assembly and vehicle

Abstract

The utility model discloses a cover plate assembly, a battery shell, a battery assembly and a vehicle, relates to the technical field of batteries, and aims to solve the problem that an insulating part is burnt in the welding process of a battery cover plate. The cover plate assembly comprises a cover plate body, a protection piece and an insulation piece arranged on the cover plate body, and at least part of the insulation piece is arranged on the side, away from the cover plate body, of the protection piece.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a cover assembly, a battery housing, a battery assembly and a vehicle. Background Art

[0002] With the rapid development of science and technology and the maturity of battery technology, lithium batteries are widely used in electric vehicles and energy storage fields due to their advantages of high energy density, long cycle life and low self-discharge rate.

[0003] During lithium battery manufacturing, the battery is encapsulated by welding the battery cover to the battery casing. The terminals are exposed through the cover, facilitating connection to electrical appliances for charging and discharging. To prevent contact between the terminals and the cover, which could cause a short circuit or leakage, an insulating block is typically placed on the cover to provide isolation.

[0004] The insulating block is usually made of polyphenylene sulfide (PPS), which has good insulation properties and high dielectric strength. However, when the battery cover and shell are welded using the side welding process, the laser trajectory will be offset and the laser will hit the side of the insulating block. Due to the low melting point of PPS material, the insulating block is easily burned, affecting the insulation performance and causing the battery to be scrapped. Utility Model Content

[0005] The purpose of this application is to provide a cover assembly, a battery housing, a battery assembly and a vehicle, aiming to solve the problem of insulating parts burning during the welding process of the battery cover.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] In a first aspect, an embodiment of the present application provides a cover assembly, which may include a cover body, a protective member, and an insulating member arranged on the cover body, wherein at least a portion of the insulating member is arranged on a side of the protective member away from the cover body.

[0008] In this way, when the laser trajectory is offset, since at least part of the insulating part is arranged on the side of the protective part away from the cover body, the laser will hit the protective part closer to the cover body, thereby preventing the insulating part from being burned, and further avoiding leakage or short circuit caused by burning of the insulating part.

[0009] In some embodiments, the cover body may include a first wall and a second wall that are oppositely disposed, the first wall being used to connect with the housing, and an insulating member being disposed on the second wall.

[0010] The first wall of the cover body can be connected to the shell to achieve battery packaging. If the cover body and the shell are side-welded, the laser beam deviates toward the side of the second wall where the insulating member is provided. Since at least a portion of the insulating member is provided on the side of the protective member away from the cover body, the protective member can protect the insulating member, thereby preventing the insulating member from being ablated by the laser.

[0011] In some embodiments, a groove may be provided on the second wall surface, a portion of the protective member is provided in the groove, and a portion of the protective member protrudes from the groove.

[0012] Since part of the protective member is arranged in the groove, the groove can position the protective member, and since part of the protective member protrudes from the groove, the protruding portion is higher than the surface of the cover body. When the laser deviates toward the second wall, the protruding portion can withstand the burning of the laser, thereby preventing the laser from causing damage to the insulating member.

[0013] In some embodiments, the protective member can be arranged in abutment with the sidewall of the groove. In this way, the groove can limit the protective member, thereby preventing the protective member from sliding in the groove and causing unstable connection.

[0014] In some embodiments, the insulating member may include a first insulating portion, at least a portion of the first insulating portion is disposed in the groove, and at least a portion of the protective member is disposed around the first insulating portion.

[0015] This allows the first insulating portion to isolate the protective member from the terminal within the first insulating portion, preventing contact between the terminal and the protective member, which could lead to battery leakage or short circuits. Furthermore, because at least a portion of the first insulating portion is disposed within the recess, the first insulating portion is within the laser ablation zone. The protective member surrounding the first insulating portion protects it from laser ablation.

[0016] In some embodiments, the insulating member may further include a second insulating portion connected to the first insulating portion, and the second insulating portion is disposed on a side of the protective member away from the bottom surface of the groove.

[0017] In this way, the second insulating part can also be used to isolate the pole and the protective part, preventing the pole from directly contacting the protective part on the side away from the bottom surface of the groove and causing leakage. At the same time, since the second insulating part is arranged on the side of the protective part away from the bottom surface of the groove, burns can be avoided when the laser beam is offset.

[0018] In some embodiments, the second insulating portion and the groove may enclose a first mounting cavity, and the protective member is disposed in the first mounting cavity. In this way, the first mounting cavity can accommodate the protective member, thereby making the protective member more tightly mounted and preventing the insulating member from being burned due to loosening of the protective member.

[0019] In some embodiments, the protective member may include a first protective member and a second protective member disposed opposite each other, with the first insulating portion disposed between the first and second protective members. In this manner, both the first and second protective members can protect the first insulating portion from laser burns. The protective member is designed as a split structure for ease of manufacture and installation.

[0020] In some embodiments, an avoidance gap is formed between the first protective member and the second protective member and within the groove; the cover assembly also includes a boss arranged in the avoidance gap, the boss protrudes from the side wall of the groove, and the boss abuts against both the first protective member and the second protective member.

[0021] In this way, the boss can limit the position of the first and second protective members, preventing them from moving in the groove, which could result in inadequate protection of the first insulating portion and burns to the insulating member. Furthermore, the provision of this limiting feature facilitates automated assembly between the cover body and the protective members, thereby improving assembly efficiency and reducing production costs.

[0022] In some embodiments, the boss is flush with the second wall surface. In this way, a mounting groove can be formed between the first protection member, the second protection member and the boss, and the mounting groove can be used to clamp the pole protection bracket.

[0023] In some embodiments, the melting point of the protective member is higher than that of the cover body, thereby preventing the protective member from being ablated by the laser, thereby protecting the insulating member from being ablated by the laser, and further preventing leakage or short circuit caused by direct contact between the pole and the cover body.

[0024] In a second aspect, an embodiment of the present application further provides a battery housing comprising the above-mentioned cover assembly.

[0025] In some embodiments, the battery comprises a housing having a storage space formed therein, the storage space being used to accommodate at least a battery cell; an opening formed in the housing communicating with the storage space, and a cover assembly disposed at the opening. The cover assembly can be welded to the housing to achieve battery encapsulation.

[0026] In a third aspect, an embodiment of the present application further provides a battery assembly, comprising the above-mentioned battery housing.

[0027] In some embodiments, the battery housing includes a shell with a accommodating space formed therein; the battery assembly includes a battery cell, which is disposed in the accommodating space to prevent the battery cell from contacting external air or parts and causing a battery short circuit.

[0028] In some embodiments, a through-hole is provided on the cover body; the battery assembly also includes a pole connected to the battery cell, at least part of the pole extends out of the accommodating space through the through-hole to enable the battery cell to be connected to the external conductor to realize charging and discharging of the battery.

[0029] Fourthly, embodiments of the present application further provide a vehicle comprising the aforementioned cover plate assembly, battery housing, or battery assembly. It should be noted that the technical effects of the implementations of the second, third, and fourth aspects can refer to the technical effects of the corresponding implementations of the first aspect and will not be further elaborated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0031] Figure 1 An exploded view of a cover plate assembly provided in an embodiment of the present application;

[0032] Figure 2 for Figure 1 A schematic structural diagram of the cover assembly shown;

[0033] Figure 3 for Figure 2 The assembly diagram of the cover body and the protective member shown;

[0034] Figure 4 for Figure 2 One of the cross-sectional views of the cover assembly is shown;

[0035] Figure 5 for Figure 2 A second cross-sectional view of the cover assembly is shown.

[0036] Reference numerals: 100, cover plate assembly;

[0037] 1. Cover plate body; 101. First wall; 102. Second wall; 11. Groove; 12. Boss;

[0038] 2. Protective member; 21. First protective member; 22. Second protective member; 23. Protruding portion; 24. Avoidance gap; 25. Mounting slot;

[0039] 3. Insulating member; 31. First insulating portion; 32. Second insulating portion; 33. First mounting cavity;

[0040] 4. Conductive aluminum column; 5. Sealing ring; 6. Spacer ring; 7. Lead-out plate; 8. Through-hole; 9. Pole; a. Protrusion height; b. Groove depth; c. Protective element height; d. Protective element width; e. At least part of the width of the second insulating part; f. At least part of the height of the second insulating part. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0042] In the description of the present invention, it should be understood that the terms "upper," "lower," "left," "right," "front," "back," "inner," "outer," and the like, indicating directions or positional relationships, are based on the directions or relative positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific direction, be constructed, or operate in a specific direction. Therefore, they should not be construed as limitations on the present invention. Unless otherwise specified, the above-mentioned directions may be flexibly set in actual application, provided that the relative positional relationships shown in the accompanying drawings are met.

[0043] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of this utility model, unless otherwise specified, "plurality" means two or more.

[0044] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "communicated" should be understood broadly. For example, they may refer to fixed connections, detachable connections, or integral connections. They may be directly connected, indirectly connected through an intermediary, or internally connected between two components. Those skilled in the art will understand the specific meanings of these terms in this utility model based on the specific circumstances.

[0045] In the embodiments of the present invention, the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, article, or device comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, article, or device comprising the element.

[0046] In the embodiments of the present invention, words such as "exemplary" or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of the present invention should not be construed as being preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "for example" is intended to present the relevant concepts in a concrete manner.

[0047] With the rapid development of science and technology and the maturity of battery technology, lithium batteries are widely used in electric vehicles and energy storage fields due to their advantages of high energy density, long cycle life and low self-discharge rate.

[0048] During lithium battery manufacturing, the battery cover and casing are laser welded together to encapsulate the battery. The terminals are exposed to the battery surface through the cover, facilitating connection with external conductors for charging and discharging. To prevent contact between the terminals and the cover, which could cause short circuits or leakage, an insulating block is typically placed on the cover to provide isolation.

[0049] The insulating block is usually made of polyphenylene sulfide (PPS), which has good heat resistance, chemical resistance, good insulation performance and high dielectric strength. However, when the battery shell cover is sealed using a side welding process, if the laser track deviates beyond the allowable error during the welding process, the laser will scan the side of the insulating block, causing the insulating block to burn, affecting the insulation performance of the insulating block, and posing a high safety hazard.

[0050] In existing technology, a tooling block can be used to shield the insulation block during the welding process to prevent burns. However, the tooling block is ablated by the laser, and when the block is ablated and light leaks out, it will still burn the pole insulation block. This method makes the tooling block easily worn and requires regular replacement, which not only affects production time but also increases production costs.

[0051] In addition, since a location for installing a tooling pressure block needs to be reserved outside the insulating block, the size of the insulating block is limited, thereby limiting the size of the pole and affecting the overcurrent capacity of the pole.

[0052] As the demand for high-voltage fast charging of battery cells continues to increase, the size of the poles gradually increases, further compressing the installation position of the tooling blocks. The side walls of the tooling blocks are thinner, and the probability of ablation and light leakage increases, which causes the insulating blocks to burn out.

[0053] Based on this, an embodiment of the present application provides a cover assembly. By adding a protective part and arranging at least a portion of the insulating part on the side of the protective part away from the cover body, when the laser trajectory is offset, the laser hits the protective part, thereby protecting the insulating block and preventing the insulating block from being burned and causing battery failure.

[0054] Please refer to Figures 1 to 4 , Figure 1This is an exploded view of a cover plate assembly 100 provided in an embodiment of the present application. Figure 2 for Figure 1 The structural diagram of the cover assembly 100 is shown in FIG. Figure 3 for Figure 2 The assembly diagram of the cover body 1 and the protective member 2 is shown. Figure 4 for Figure 2 One of the cross-sectional views of the cover assembly 100 is shown. The cover assembly 100 may include a cover body 1, a protective member 2, and an insulating member 3 disposed on the cover body 1, wherein at least a portion of the insulating member 3 is disposed on a side of the protective member 2 away from the cover body 1.

[0055] In this way, when the laser trajectory is offset, since at least part of the insulating part 3 is arranged on the side of the protective part 2 away from the cover body 1, the laser will hit the protective part 2 closer to the cover body 1, thereby preventing the insulating part 3 from being burned, and further preventing leakage or short circuit caused by the burning of the insulating part 3.

[0056] In some embodiments of the present application, the cover body 1 may include a first wall 101 and a second wall 102 that are oppositely arranged. The first wall 101 is used to connect with the shell, and the second wall 102 is provided with an insulating member 3.

[0057] The first wall 101 of the cover body 1 can be connected to the shell to achieve battery packaging. If the cover body 1 and the shell are side-welded, the laser beam deviates to one side of the second wall 102. Since at least part of the insulating member 3 is arranged on the side of the protective member 2 away from the cover body 1, the protective member 2 can protect the insulating member 3 to prevent the insulating member 3 from being ablated by the laser.

[0058] In some embodiments of the present application, a groove 11 may be provided on the second wall surface 102 , and a portion of the protection member 2 is disposed in the groove 11 , while a portion of the protection member 2 protrudes from the groove 11 .

[0059] Since part of the protective member 2 is arranged in the groove 11, the groove 11 can position the protective member 2, and since part of the protective member 2 protrudes from the groove 11, the protruding portion 23 is higher than the surface of the cover body 1. When the laser deviates toward the second wall 102, the protruding portion 23 can withstand the burning of the laser, thereby preventing the laser from causing damage to the insulating member 3.

[0060] In some embodiments, the protrusion height a of the protrusion 23 can be selected according to the trajectory offset of the laser beam. Exemplarily, the protrusion height a can be 0.2 mm to 5 mm. For example, the protrusion height a is 0.2 mm, 0.5 mm, 0.6 mm, 0.7 mm, 1 mm, 1.6 mm, 3 mm, 4.3 mm or 5 mm. This application does not further limit this.

[0061] In some embodiments, the protective member 2 can be arranged in contact with the sidewall of the groove 11. In this way, the groove 11 can limit the protective member 2, thereby preventing the protective member 2 from sliding in the groove 11 and causing an unstable connection.

[0062] In some embodiments of the present application, the insulating member 3 may include a first insulating portion 31 , at least a portion of the first insulating portion 31 is disposed in the groove 11 , and at least a portion of the protective member 2 is disposed around the first insulating portion 31 .

[0063] In this way, the first insulating portion 31 can isolate the protective member 2 from the terminal 9 within the first insulating portion 31, preventing the terminal 9 from contacting the protective member 2 and causing battery leakage or short circuit. It will be understood that because at least a portion of the first insulating portion 31 is disposed within the groove 11, the first insulating portion 31 is within the laser deflection ablation area. The protective member 2 surrounding the first insulating portion 31 can protect the first insulating portion 31 from laser ablation.

[0064] In some embodiments of the present application, the insulating member 3 may further include a second insulating portion 32 connected to the first insulating portion 31 , and the second insulating portion 32 is disposed on a side of the protective member 2 away from the bottom surface of the groove 11 .

[0065] In this way, the second insulating portion 32 can also be used to isolate the pole 9 and the protective member 2, preventing the pole 9 from directly contacting the side of the protective member 2 away from the bottom surface of the groove 11 and causing leakage. At the same time, since the second insulating portion 32 is arranged on the side of the protective member 2 away from the bottom surface of the groove 11, burns can be avoided when the laser beam is offset.

[0066] In some embodiments of the present application, the first insulating portion 31 and the second insulating portion 32 can be arranged in a stepped shape. The second insulating portion 32 and the groove 11 can enclose a first mounting cavity 33, and the protective member 2 is disposed in the first mounting cavity 33. In this way, the first mounting cavity 33 can accommodate the protective member 2, thereby making the installation of the protective member 2 more compact and preventing the insulating member 3 from being burned due to the loosening of the protective member 2.

[0067] In some embodiments of the present application, the protective member 2 may include a first protective member 21 and a second protective member 22 arranged opposite to each other, and the first insulating portion 31 is arranged between the first protective member 21 and the second protective member 22 .

[0068] In this way, both the first protective member 21 and the second protective member 22 can protect the first insulating portion 31 to prevent the first insulating portion 31 from being burned by the laser. The protective member 2 is designed as a split structure to facilitate manufacturing and installation.

[0069] In some embodiments of the present application, an avoidance gap 24 is formed between the first protective member 21 and the second protective member 22 and within the groove 11. The cover assembly 100 may further include a boss 12 arranged in the avoidance gap 24. The boss 12 protrudes from the side wall of the groove 11, and the boss 12 abuts against both the first protective member 21 and the second protective member 22.

[0070] In this way, the boss 12 can limit the first and second protective members 21, 22, preventing them from moving within the groove 11, which could result in inadequate protection of the first insulating portion 31 and burns to the insulating member 3. Furthermore, the provision of this limiting feature facilitates automated assembly between the cover body 1 and the protective member 2, thereby improving assembly efficiency and reducing production costs.

[0071] In some embodiments of the present application, the boss 12 is flush with the second wall 102. Thus, a mounting groove 25 can be formed between the first protection member 21, the second protection member 22 and the boss 12, and the mounting groove 25 can be used to clamp the pole 9 protection bracket.

[0072] In some embodiments of the present application, the melting point of the protective member 2 is higher than that of the cover body 1. This prevents the protective member 2 from being ablated by the laser, thereby protecting the insulating member 3 from being ablated by the laser, thereby preventing the pole 9 and the cover body 1 from direct contact, thereby preventing leakage or short circuit.

[0073] For example, the material of the protective member 2 may be 304 stainless steel (ie, SUS304), nickel, tungsten, ceramic, or silicon carbide, which is not further limited in the present application.

[0074] In some embodiments, when the material of the protective member 2 is a metal material such as SUS304 or nickel, the protective member 2 can be processed by a stamping process or a bending process. This makes the processing simpler and can reduce the manufacturing cost.

[0075] The cover plate assembly 100 provided in the embodiment of the present application can protect the insulating part 3 without the need for a tooling block, thereby eliminating the need to reserve installation space for the tooling block. In this way, the minimum distance between the insulating part 3 and the weld between the cover plate and the shell can be 0 mm, thereby ensuring the size of the pole 9 and the battery's current capacity and heat dissipation performance, which is beneficial to the high-voltage fast charging design of the battery.

[0076] In some embodiments of the present application, the cover assembly 100 may further include a conductive aluminum column 4, which is arranged on the side of the insulating member 3 away from the cover body 1, and is used to connect the pole 9 and the external conductor, thereby realizing charging and discharging of the battery. The conductive aluminum column 4 can expand the connection area with the external conductor and enhance the conductivity and heat dissipation performance of the battery.

[0077] In some embodiments, the cover assembly 100 may further include a sealing ring 5 , which is connected between the cover body 1 and the pole 9 to prevent leakage of electrolyte in the battery pack, thereby causing battery leakage.

[0078] In some embodiments, the cover assembly 100 may further include a spacer 6 , which is disposed on the second wall 102 to prevent the battery cell from directly contacting the cover body 1 and causing a battery short circuit.

[0079] In some embodiments, the cover assembly 100 may further include an assembly lead-out tab 7 , which is disposed on a side of the assembly spacer 6 facing away from the cover body 1 and may be connected to the battery cell to draw out the current of the battery cell.

[0080] The assembly lead-out piece 7, the assembly spacer 6, the cover body 1, the insulating part 3 and the conductive aluminum column 4 are all provided with a through-hole 8, through which the pole 9 can be connected to the external conductor, and the cover assembly 100 is riveted through the opening to fix the various components.

[0081] Please refer to Figures 1 to 5 , Figure 5 for Figure 2 As shown in the second cross-sectional view of the cover assembly 100, in some embodiments of the present application, the groove depth b can be 0.5 mm to 1 mm. Exemplarily, the groove depth b is 0.5 mm, 0.7 mm or 1 mm. In this way, the height of the portion of the protective member 2 located in the groove 11 does not need to be too high, thereby saving material for the protective member 2 and saving manufacturing costs.

[0082] In some embodiments, the height c of the protective member may be greater than the groove depth b+0.2 mm. For example, the height c of the protective member is 0.7 mm, 1 mm, or 3 mm, which may be selected according to the offset of the laser welding track.

[0083] In some embodiments, the width d of the protective member can be 0.5mm to 1mm. For example, the groove depth b is 0.5mm, 0.7mm or 1mm. In this way, the manufacturing process feasibility of the protective member 2 can be met, which is conducive to mass production and cost minimization.

[0084] In some embodiments, at least part of the width e of the second insulating portion can be greater than 0.7 mm. For example, at least part of the width e of the second insulating portion can be 0.7 mm, 0.9 mm, 1 mm or 1.5 mm. In this way, the injection molding feasibility of the insulating part 3 can be met and the injection molding yield can be improved.

[0085] In some embodiments, the height f of at least a portion of the second insulating portion may be greater than or equal to 0.7 mm. Exemplarily, the height f of at least a portion of the second insulating portion may be 0.7 mm, 1 mm, 1.2 mm, or 1.5 mm. The height f of at least a portion of the second insulating portion depends on the lengthwise dimension of the battery pole 9 and the feasibility of the injection molding process to ensure that the insulating part 3 does not crack during riveting.

[0086] An embodiment of the present application further provides a battery housing, which may include the above-mentioned cover plate assembly 100.

[0087] In some embodiments, the battery housing may further include a shell having a housing formed therein, wherein the housing has a storage space for accommodating the battery cell. The shell has an opening communicating with the storage space, and the cover assembly 100 is disposed at the opening so that the cover body 1 is welded to the shell, thereby achieving battery encapsulation.

[0088] An embodiment of the present application also provides a battery assembly, which may include the above-mentioned battery housing.

[0089] In some embodiments, the battery housing may include a shell with a storage space formed therein. The battery assembly may also include a battery cell, which is disposed in the storage space to prevent the battery cell from contacting external air or parts and causing a battery short circuit.

[0090] In some embodiments, a through-hole 8 is provided on the cover body 1, and the battery assembly may further include a pole 9 connected to the battery cell, at least part of the pole 9 extends out of the accommodating space through the through-hole 8 to enable the battery cell to be connected to the external conductor to realize charging and discharging of the battery.

[0091] The present application also provides a vehicle that may include the aforementioned cover plate assembly 100, a battery housing, or a battery assembly. In the vehicle's battery, the insulating block between the terminal 9 and the cover plate body 1 is structurally intact and has excellent insulation performance, thereby preventing leakage or short circuits in the battery assembly, thereby ensuring a good range for the vehicle.

[0092] In the description of this specification, specific features, structures, materials or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.

[0093] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A cover plate assembly, characterized in that: It comprises a cover plate body (1), a protective member (2), and an insulating member (3) arranged on the cover plate body (1), wherein at least a portion of the insulating member (3) is arranged on a side of the protective member (2) away from the cover plate body (1).

2. The cover plate assembly according to claim 1, wherein: The cover plate body (1) comprises a first wall surface (101) and a second wall surface (102) arranged opposite to each other, the first wall surface (101) being used for connecting with the shell, and the protective member (2) being arranged on the second wall surface (102).

3. The cover plate assembly according to claim 2, wherein: A groove (11) is provided on the second wall surface (102), a portion of the protective member (2) is provided in the groove (11), and a portion of the protective member (2) protrudes from the groove (11).

4. The cover plate assembly according to claim 3, wherein: The protective member (2) is arranged in contact with the side wall of the groove (11).

5. The cover plate assembly according to claim 3, wherein: The insulating member (3) comprises a first insulating portion (31), at least a portion of the first insulating portion (31) is disposed in the groove (11), and at least a portion of the protective member (2) is disposed around the first insulating portion (31).

6. The cover plate assembly according to claim 5, wherein: The insulating member (3) further comprises a second insulating portion (32) connected to the first insulating portion (31), and the second insulating portion (32) is arranged on a side of the protective member (2) away from the bottom surface of the groove (11).

7. The cover plate assembly according to claim 6, wherein: The second insulating portion (32) and the groove (11) enclose a first installation cavity (33), and the protective member (2) is arranged in the first installation cavity (33).

8. The cover plate assembly according to claim 5, wherein: The protective member (2) comprises a first protective member (21) and a second protective member (22) arranged opposite to each other, and the first insulating portion (31) is arranged between the first protective member (21) and the second protective member (22).

9. The cover plate assembly according to claim 8, wherein: An escape gap (24) is formed between the first protective member (21) and the second protective member (22) and located within the groove (11); The cover plate assembly further comprises a boss (12) arranged in the avoidance gap (24), the boss (12) protruding from the side wall of the groove (11), and the boss (12) abuts against both the first protective member (21) and the second protective member (22).

10. The cover plate assembly according to claim 9, wherein: The boss (12) is flush with the second wall surface (102).

11. The cover plate assembly according to claim 1, wherein: The melting point of the protective member (2) is higher than the melting point of the cover plate body (1).

12. A battery casing, characterized in that: The invention comprises the cover plate assembly (100) according to any one of claims 1 to 11.

13. The battery housing according to claim 12, wherein: The housing comprises a housing, wherein a receiving space is formed in the housing, and the receiving space is used to receive at least a battery cell; An opening communicating with the accommodating space is formed on the shell, and the cover assembly is arranged at the opening.

14. A battery assembly, characterized in that: The battery casing comprises the battery casing according to claim 12 or 13.

15. The battery assembly according to claim 14, wherein: The battery housing includes a shell having a storage space formed therein; the battery assembly includes a battery cell, and the battery cell is disposed in the storage space.

16. The battery assembly according to claim 15, characterized in that The cover plate body (1) is provided with a through opening (8); The battery assembly further comprises a pole (9) connected to the battery cell, and at least a portion of the pole (9) extends out of the accommodation space through the through opening (8).

17. A vehicle, characterized in that: It comprises the cover plate assembly (100) according to any one of claims 1 to 11, or the battery housing according to claim 12 or 13, or the battery assembly according to any one of claims 14 to 16.

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