Cover plate assembly, battery, battery pack and electric equipment

Abstract

The utility model discloses a cover plate assembly, a battery, a battery pack and electric equipment. The cover plate assembly comprises a cover plate, an insulating plate and a pole, the cover plate is provided with a first through hole. The insulating plate is arranged on the side, facing the battery cell, of the cover plate, a second through hole is formed in the insulating plate, the insulating plate and the cover plate are arranged in a stacked mode, and the second through hole corresponds to the first through hole. The pole is arranged on one side, back to the battery cell, of the cover plate, penetrates through the first through hole and the second through hole, is in insulation fit with the first through hole and is in clearance fit with the second through hole, a first clearance space is formed between the pole and the second through hole, and the first clearance space is communicated with the accommodating space of the battery shell. When the electrolyte accidentally enters the first clearance space, the electrolyte can flow back into the accommodating space of the battery shell, so that an electrolytic tank formed due to long-time contact between the pole and the electrolyte is avoided, and the influence of the electrolytic tank on the shell pressure is inhibited.

Description

Technical Field

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

[0002] The blade battery includes a cover plate assembly, which includes a cover plate, a terminal, an insulating ring, a ring-shaped insulator, and a sealing ring. The insulating ring, insulating ring, and sealing ring are sleeved onto the terminal. The insulating ring is sandwiched between the insulating ring and the sealing ring. The cover plate presses down on the insulating ring, which in turn presses down on the sealing ring to form a sealed space.

[0003] However, when the electrolyte accidentally enters the confined space, the pole is in contact with the electrolyte for a long time, and the pole will form a micro-electrolytic cell under the action of the electrolyte, which will cause the shell pressure of the blade battery to drop abnormally and the battery shell to be corroded by low pressure. Utility Model Content

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, one objective of the present invention is to provide a cover plate assembly, a battery, a battery pack, and an electrical device that prevents the formation of an electrolytic pool due to prolonged contact between the electrode and the electrolyte, thereby suppressing the effect of the electrolytic pool on the battery case pressure and thus ensuring the integrity of the battery case.

[0005] The cover plate assembly according to the embodiment of the first aspect of the present invention is used to seal a battery housing and includes: a cover plate, an insulating plate, and a terminal post.

[0006] The cover plate is provided with a first through hole. The insulating plate is provided on a side of the cover plate facing the battery cell, the insulating plate is provided with a second through hole, the insulating plate and the cover plate are stacked, and the second through hole corresponds to the first through hole.

[0007] The pole is arranged on the side of the cover plate facing away from the battery cell, and the pole passes through the first through hole and the second through hole. The pole is insulated from the first through hole, and the pole is gap-fitted with the second through hole to form a first gap space therebetween. The first gap space is suitable for communicating with the receiving space of the battery shell.

[0008] In this embodiment, the first gap space is connected to the storage space of the battery housing. If electrolyte accidentally enters the first gap space, it can flow back into the storage space of the battery housing. This prevents the formation of an electrolytic pool due to prolonged contact between the electrode and the electrolyte, thereby suppressing the impact of the electrolytic pool on the housing pressure and ensuring the integrity of the battery housing. At the same time, due to the mutual pressure between any two adjacent parts of the first end of the electrode, the insulating ring, the disc, the cover plate, the insulating plate, and the electrode connecting piece, the first gap space a is a sealed space. This ensures the sealing performance of the battery cover plate and improves the service life and safety of the battery.

[0009] According to some embodiments of the present invention, the invention further comprises a pole connecting piece located on the side of the insulating plate facing away from the cover plate, wherein the pole connecting piece is stacked with the insulating plate.

[0010] A first communication channel is provided on at least one of the surface of the insulating plate facing the pole connecting piece and the surface of the pole connecting piece facing the insulating plate. One end of the first communication channel is connected to the accommodating space of the battery shell, and the other end is connected to the first gap space.

[0011] According to some embodiments of the present invention, a blocking portion is provided on the side of the second through hole facing the cover plate, and the blocking portion is located between the side wall of the first through hole and the pole, so that the pole and the first through hole are insulated and matched, wherein the first gap space is formed between the blocking portion and the pole.

[0012] According to some embodiments of the present invention, the barrier portion and the side wall of the first through hole are spaced apart to form a second gap space, the second gap space is connected to the first gap space, and the second gap space is suitable for connecting with the receiving space of the battery shell.

[0013] According to some embodiments of the present invention, the second through hole faces the opening edge of the cover plate and protrudes along the direction from the insulating plate to the cover plate to form the blocking portion, and the blocking portion protrudes from the surface where the cover plate and the insulating plate are in contact.

[0014] According to some embodiments of the present invention, an insulating ring is further included on the side of the cover plate facing away from the insulating plate, the pole passes through the insulating ring, and there is a distance d between the insulating ring and the blocking portion, 0.2mm≤d≤0.5mm.

[0015] According to some embodiments of the present invention, at least one of the surface of the cover plate facing the insulating plate and the surface of the insulating plate facing the cover plate is provided with a second connecting channel, one end of the second connecting channel is connected to the accommodating space of the battery shell, and the other end is connected to the second gap space.

[0016] According to some embodiments of the present invention, an exhaust hole is provided on the insulating plate, the exhaust hole is communicated with the receiving space of the battery housing, and the exhaust hole is communicated with the second communicating channel.

[0017] According to some embodiments of the present invention, a liquid collection groove is provided on the surface of the insulating plate in contact with the cover plate, and the liquid collection groove is communicated with the second gap space and the second communication channel.

[0018] The battery according to the embodiment of the second aspect of the present invention comprises a battery housing, a battery cell and the cover plate assembly of the first aspect, wherein the battery cell is disposed in the battery housing and the cover plate assembly is covered on the battery housing.

[0019] A battery pack according to an embodiment of the third aspect of the present invention includes a battery pack housing and the battery of the second aspect, wherein a plurality of the batteries are disposed in the battery pack housing.

[0020] According to an embodiment of the fourth aspect of the present invention, an electrical device includes an electrical appliance and the battery pack according to the third aspect, wherein the battery pack is used to supply power to the electrical appliance.

[0021] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0023] Figure 1 1 is a structural diagram of a cover plate assembly according to an embodiment of the present utility model;

[0024] Figure 2 is an exploded schematic diagram of a cover plate assembly according to an embodiment of the present utility model;

[0025] Figure 3 is a cross-sectional schematic diagram of a cover plate assembly according to an embodiment of the present utility model;

[0026] Figure 4 is a structural schematic diagram of an insulation board according to an embodiment of the present utility model;

[0027] Reference numerals:

[0028] Cover plate assembly 100;

[0029] Pole 10, first end 11, second end 12;

[0030] Insulating ring 20, disc 30;

[0031] Cover plate 40, first through hole 41;

[0032] Insulating plate 50, second through hole 51, blocking portion 52, liquid storage groove 53, exhaust hole 54;

[0033] Pole connecting piece 60, connecting hole 61;

[0034] First gap space a, second gap space b, first communication channel A, second communication channel B. DETAILED DESCRIPTION

[0035] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0036] The disclosure below provides many different embodiments or examples for realizing different structures of the present invention. In order to simplify the disclosure of the present invention, the components and settings of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. In addition, the present invention may repeat reference numbers and / or letters in different examples. This repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides examples of various specific processes and materials, but a person of ordinary skill in the art will appreciate the applicability of other processes and / or the use of other materials.

[0037] like Figures 1-4 As shown, a cover plate assembly 100 according to an embodiment of the first aspect of the present invention is used to close a battery housing, and includes: a cover plate 40 , an insulating plate 50 and a pole 10 .

[0038] The cover plate 40 defines a first through hole 41 .

[0039] The insulating plate 50 is disposed on the side of the cover plate 40 facing the battery cells. The insulating plate 50 is provided with a second through hole 51 . The insulating plate 50 and the cover plate 40 are stacked, and the second through hole 51 corresponds to the first through hole 41 .

[0040] The terminal 10 is disposed on the side of the cover plate 40 facing away from the battery cell. The terminal 10 passes through the first through-hole 41 and the second through-hole 51. The terminal 10 and the first through-hole 41 are insulated and fitted together. The terminal 10 and the second through-hole 51 are also spaced apart to form a first gap a therebetween. The first gap a is adapted to communicate with the receiving space of the battery housing.

[0041] It should be noted that in actual use, the battery includes a cover plate assembly 100, a battery cell (not shown), and a battery housing. The battery housing has a receiving space for the battery cell, which is located within the battery housing. In other words, the electrolyte of the battery cell is located within the receiving space. The cover plate assembly 100 covers the opening of the battery housing.

[0042] In related art, the cover plate assembly 100 includes a cover plate, a pole, an insulating ring, a ring-shaped insulating member, and a sealing ring. The insulating ring, insulating member, and sealing ring are sleeved onto the pole. The insulating member is sandwiched between the insulating ring and the sealing ring. The cover plate presses down on the insulating ring, which in turn presses down on the sealing ring to form a sealed space.

[0043] However, when the electrolyte accidentally enters the confined space, the sealing ring will be corroded and aged by the electrolyte after coming into contact with the electrolyte, causing the sealing ring to fail, thereby causing the sealing performance of the cover assembly to fail; at the same time, the pole is in contact with the electrolyte for a long time, and the pole will form a micro-electrolytic cell under the action of the electrolyte, thereby causing the shell pressure of the blade battery to drop abnormally and the battery shell to be corroded by low pressure.

[0044] Based on this, Figure 2 、 Figure 3 As shown, the blade battery of this embodiment includes a terminal 10, a battery cell (not shown), and an insulating ring 20, a disc 30, a cover plate 40, an insulating plate 50, and a terminal connecting piece 60 arranged in order from top to bottom. Among them, the cover plate 40, the insulating plate 50, and the terminal connecting piece 60 are stacked.

[0045] The cover plate 40, the terminal connecting piece 60, and the terminal 10 are all made of a conductive material, such as a conductive metal. The terminal 10 and the terminal connecting piece 60 can be made of the same conductive material. The disc 30 can be made of metal. The insulating plate 50 can be made of a composite material such as plastic, rubber, ceramic, or a non-ceramic material. Ceramics have better thermal conductivity and a higher melting point, which can improve the heat dissipation efficiency of the blade battery and reduce the temperature inside the blade cell.

[0046] like Figure 2-Figure 4 As shown, the cover plate 40 is provided with a first through hole 41 , the insulating plate 50 is provided with a second through hole 51 , the pole connecting piece 60 is provided with a connecting hole 61 , and the second through hole 51 , the first through hole 41 , and the connecting hole 61 are coaxially arranged.

[0047] like Figure 3 As shown, the pole 10 has a first end 11 (i.e., the upper end) and a second end 12 (i.e., the lower end). The second end 12 of the pole 10 can pass through the insulating ring 20, the disc 30, the first through hole 41, the second through hole 51 in sequence, and be connected to the connection hole 61 of the pole connecting plate 60.

[0048] Among them, the pole 10 and the first through hole 41 are insulated and matched, which can be understood as that there is a gap between the pole 10 and the first through hole 41, or that insulating related parts are provided between the pole 10 and the first through hole 41 to achieve the insulation cooperation between the pole 10 and the first through hole 41, thereby ensuring that the blade battery cell conducts electricity through the pole 10 and the pole connecting piece 60 to prevent the battery from short circuiting.

[0049] The terminal post 10 and the second through hole 51 are clearance-fitted to form a first gap space a therebetween. The first gap space a is communicated with the receiving space of the battery housing.

[0050] It should be noted that the first gap a is a sealed space due to the mutual pressure between any two adjacent elements of the first end 11 of the terminal 10, the insulating ring 20, the disc 30, the cover 40, the insulating plate 50, and the terminal connecting piece 60. This ensures the sealing performance of the battery cover 40 and improves the service life and safety of the blade battery.

[0051] In addition, the width of the insulating plate 50 can be greater than or equal to the width of the pole connecting piece 60, and the length of the insulating plate 50 is greater than the length of the pole connecting piece 60. Below the pole connecting piece 60 is the battery cell.

[0052] However, in actual production, due to limitations in machining accuracy, the flatness of the surface of the insulating plate 50 facing the terminal connecting tab 60 and the surface of the terminal connecting tab 60 facing the insulating plate 50 cannot be completely aligned after the surface of the insulating plate 50 facing the terminal connecting tab 60 and the surface of the terminal connecting tab 60 facing the insulating plate 50 are attached. Therefore, a gap exists between the surface of the insulating plate 50 facing the terminal connecting tab 60 and the surface of the terminal connecting tab 60 facing the insulating plate 50. The gap is connected to the housing space of the battery case.

[0053] When the electrolyte accidentally enters the first gap space a, the electrolyte can flow back into the receiving space of the battery shell through the above-mentioned gap, avoiding the formation of an electrolytic cell due to long-term contact between the electrode 10 and the electrolyte, thereby suppressing the influence of the electrolytic cell on the shell pressure, thereby ensuring the integrity of the battery shell.

[0054] In summary, this embodiment is connected to the storage space of the battery shell through the first gap space a. If the electrolyte accidentally enters the first gap space a, the electrolyte can flow back into the storage space of the battery shell, avoiding the formation of an electrolytic pool due to long-term contact between the electrode 10 and the electrolyte, thereby suppressing the impact of the electrolytic pool on the shell pressure, thereby ensuring the integrity of the battery shell. At the same time, due to the mutual pressure between any two adjacent ones of the first end 11 of the electrode 10, the insulating ring 20, the disc 30, the cover plate 40, the insulating plate 50, and the electrode connecting piece 60, the first gap space a is a closed space. This ensures the sealing performance of the battery cover plate 40 and improves the service life and safety of the blade battery.

[0055] In some embodiments of the present invention, at least one of the surface of the insulating plate 50 facing the pole connecting piece 60 and the surface of the pole connecting piece 60 facing the insulating plate 50 is provided with a first connecting channel A, and the first gap space a is connected to the receiving space of the battery shell through the first connecting channel A.

[0056] like Figure 3 As shown, in one embodiment, a first connecting channel A is formed by a depression on the surface of the insulating plate 50 facing the pole connecting piece 60, one end of the first connecting channel A is connected to the receiving space of the battery shell, and the other end is connected to the first gap space a; in another embodiment, a first connecting channel A is formed by a depression on the surface of the pole connecting piece 60 facing the insulating plate 50, one end of the first connecting channel A is connected to the receiving space of the battery shell, and the other end is connected to the first gap space a; in yet another embodiment, the surface of the insulating plate 50 facing the pole connecting piece 60 and the surface of the pole connecting piece 60 facing the insulating plate 50 are both recessed with channels, and the two channels are combined to form the first connecting channel A, one end of the first connecting channel A is connected to the receiving space of the battery shell, and the other end is connected to the first gap space a.

[0057] Of course, it is understandable that the first communication channel A may also be a pipe, which passes through the insulating plate 50 and the pole connecting piece 60 in sequence and is communicated with the receiving space of the battery shell.

[0058] In some embodiments of the present invention, a blocking portion 52 is provided on the side of the second through hole 51 facing the cover plate 40. The blocking portion 52 is located between the sidewall of the first through hole 41 and the pole 10 to insulate the pole 10 from the first through hole 41. A first gap a is formed between the blocking portion 52 and the pole 10.

[0059] In a specific embodiment, Figure 3As shown, the second through hole 51 faces the opening edge of the cover plate 40 and protrudes from the insulating plate 50 to the cover plate 40 (from bottom to top) to form a blocking portion 52. The upper end of the blocking portion 52 can protrude above the surface where the insulating plate 50 and the cover plate 40 are in contact, and is close to the surface of the cover plate 40 facing away from the insulating plate 50.

[0060] The blocking portion 52 is annular and surrounds the pole 10 . The blocking portion 52 blocks the sidewall of the first through hole 41 from contacting the pole 10 , thereby achieving insulation fit between the pole 10 and the first through hole 41 .

[0061] Furthermore, the mutual pressure between any two adjacent elements of the terminal 10's first end 11, the insulating ring 20, the disc 30, the cover 40, the insulating plate 50, and the terminal connector 60 creates a sealed space. This ensures the sealing performance of the battery cover 40 and improves the lifespan and safety of the blade battery.

[0062] Furthermore, the blocking portion 52 is spaced apart from the sidewall of the first through hole 41 to form a second gap space b. The second gap space b is communicated with the first gap space a, and the second gap space b is suitable for communicating with the receiving space of the battery housing.

[0063] In practical applications, blade batteries are used as batteries for new energy vehicles. When new energy vehicles are bumpy during driving, blade batteries Figure 3 As shown, the electrolyte in the first gap space a also shakes, and then the electrolyte can enter the second gap space b.

[0064] It should be noted that in actual production, due to limitations in machining precision, the flatness of the surface of the insulating plate 50 facing the cover plate 40 and the surface of the cover plate 40 facing the insulating plate 50 cannot be completely aligned after the two surfaces of the insulating plate 50 facing the cover plate 40 and the cover plate 40 facing the insulating plate 50 are affixed. Therefore, a gap exists between the surface of the insulating plate 50 facing the cover plate 40 and the surface of the cover plate 40 facing the insulating plate 50. This gap can connect the second gap space b with the receiving space of the battery case.

[0065] When the electrolyte can enter the second gap space b, the electrolyte located in the second gap space b can flow back to the receiving space of the battery shell through the above-mentioned gap, thereby further avoiding the formation of an electrolytic cell due to long-term contact between the electrode 10 and the electrolyte, and further suppressing the influence of the electrolytic cell on the shell pressure, thereby ensuring the integrity of the battery shell.

[0066] Further, if Figure 3As shown, the upper end of the barrier portion 52 is located between the upper and lower surfaces of the cover plate 40. A distance d exists between the barrier portion 52 and the insulating ring 20, with the value 0.2 mm ≤ d ≤ 0.5 mm. When d is less than 0.2 mm, the risk of insulation failure increases. When d is greater than 0.5 mm, assembly of the cover plate assembly 100 becomes difficult.

[0067] Furthermore, in actual applications, the insulating ring 20 is brazed to the first end 11 of the pole 10, and the disc 30 is brazed to the insulating ring 20. Brazing material may exist on the lower surface of the insulating ring 20, and the brazing material may contact the insulating plate 50, thereby reducing the pressure resistance of the insulating plate 50.

[0068] Based on this, the upper end of the blocking portion 52 is located between the upper and lower surfaces of the cover plate 40 and is disposed close to the upper surface of the cover plate 40. This can prevent the solder from contacting the insulating plate 50, thereby preventing the insulation plate 50 from deteriorating in pressure resistance.

[0069] Furthermore, the insulating plate 50 includes a main body, and the blocking portion 52 is integrally formed with the main body, for example, by injection molding, which facilitates processing and helps reduce production costs.

[0070] Further, if Figure 3 and Figure 4 As shown, the insulating plate 50 is provided with an exhaust hole 54, which is communicated with the receiving space of the battery housing. The exhaust hole is communicated with the second communication channel B.

[0071] A second communication channel B is provided on at least one of the surface of the cover plate 40 facing the insulating plate 50 and the surface of the insulating plate 50 facing the cover plate 40 . One end of the second communication channel B communicates with the exhaust hole 54 , and the other end communicates with the second gap space b.

[0072] In one embodiment, a second communication channel B is formed by a depression on the surface of the cover plate 40 facing the insulating plate 50. One end of the second communication channel B communicates with the exhaust hole 54 and the other end communicates with the second gap space b. In another embodiment, a second communication channel B is formed by a depression on the surface of the insulating plate 50 facing the cover plate 40. One end of the second communication channel B communicates with the exhaust hole 54 and the other end communicates with the second gap space b. In yet another embodiment, both the surface of the cover plate 40 facing the insulating plate 50 and the surface of the insulating plate 50 facing the cover plate 40 are recessed to form channels. The two channels together form the second communication channel B. One end of the second communication channel B communicates with the exhaust hole 54 and the other end communicates with the second gap space b.

[0073] Alternatively, as Figure 3 and Figure 4As shown, a liquid collection groove 53 is provided on the surface of the insulating plate 50 that contacts the cover plate 40. The liquid collection groove 53 connects the second interstitial space b with the second connecting channel B. The liquid collection groove 53 helps collect electrolyte that enters the second interstitial space b, allowing the electrolyte to flow back from the second interstitial space b and the vents 54 to the receiving space of the battery case, thereby improving the efficiency of electrolyte reflux.

[0074] A battery according to an embodiment of the second aspect of the present invention includes a battery housing, a battery cell, and the cover plate assembly 100 of the first aspect. The battery housing has a receiving space for the battery cell, which is disposed within the battery housing. Specifically, the electrolyte of the battery cell is located within the receiving space. The cover plate assembly 100 covers the opening of the battery housing.

[0075] The battery has the advantages of the above-mentioned cover plate assembly 100, so it is not described in detail. The battery can be a blade battery or other batteries.

[0076] According to an embodiment of the third aspect of the present invention, a battery pack comprises a battery pack housing and the battery of the second aspect, wherein a plurality of batteries are disposed in the battery pack housing. The battery pack has the advantages of the above-mentioned batteries, and therefore will not be described in detail.

[0077] According to an embodiment of the fourth aspect of the present invention, an electric device comprises an electric device and the battery pack of the third aspect, wherein the battery pack is used to power the electric device. The vehicle has the advantages of the battery pack described above, so they are not described in detail.

[0078] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the present invention.

[0079] In the description of the present invention, "first feature" and "second feature" may include one or more such features.

[0080] In the description of the present invention, “plurality” means two or more.

[0081] In the description of the present invention, a first feature being “above” or “below” a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact via another feature therebetween.

[0082] In the description of the present invention, a first feature “above”, “above” and “above” a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature.

[0083] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," and "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the illustrative use of these terms does not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0084] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and purpose of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A cover plate assembly (100) for enclosing a battery housing, characterized in that: include: A cover plate (40), wherein the cover plate (40) is provided with a first through hole (41); an insulating plate (50), the insulating plate (50) being arranged on a side of the cover plate (40) facing the battery core, the insulating plate (50) being provided with a second through hole (51), the insulating plate (50) and the cover plate (40) being stacked, the second through hole (51) corresponding to the first through hole (41); A pole (10), the pole (10) is arranged on the side of the cover plate (40) facing away from the battery cell, the pole (10) passes through the first through hole (41) and the second through hole (51), the pole (10) and the first through hole (41) are insulated and matched, the pole (10) and the second through hole (51) are gap-matched to form a first gap space (a) therebetween, and the first gap space (a) is suitable for communicating with the receiving space of the battery shell.

2. The cover plate assembly (100) according to claim 1, characterized in that: It also includes a pole connecting piece (60) located on the side of the insulating plate (50) facing away from the cover plate (40), and the pole connecting piece (60) and the insulating plate (50) are stacked. A first communication channel (A) is provided on at least one of a surface of the insulating plate (50) facing the pole connecting piece (60) and a surface of the pole connecting piece (60) facing the insulating plate (50), wherein one end of the first communication channel (A) is connected to the receiving space of the battery shell, and the other end is connected to the first gap space (a).

3. The cover plate assembly (100) according to claim 1, characterized in that A blocking portion (52) is provided on the side of the second through hole (51) facing the cover plate (40), and the blocking portion (52) is located between the side wall of the first through hole (41) and the pole (10), so as to insulate the pole (10) from the first through hole (41). Wherein, the first gap space (a) is formed between the blocking portion (52) and the pole (10).

4. The cover plate assembly (100) according to claim 3, characterized in that: The blocking portion (52) and the side wall of the first through hole (41) are spaced apart to form a second gap space (b), the second gap space (b) is connected to the first gap space (a), and the second gap space (b) is suitable for communicating with the receiving space of the battery shell.

5. The cover plate assembly (100) according to claim 4, characterized in that: The second through hole (51) faces the opening edge of the cover plate (40), and is raised along the direction from the insulating plate (50) to the cover plate (40) to form the blocking portion (52), and the blocking portion (52) protrudes from the surface where the cover plate (40) and the insulating plate (50) are in contact.

6. The cover plate assembly (100) according to claim 5, characterized in that: It also includes an insulating ring (20) located on the side of the cover plate (40) facing away from the insulating plate (50), and the pole (10) passes through the insulating ring (20). There is a distance d between the insulating ring (20) and the blocking portion (52), and the distance d is 0.2 mm ≤ d ≤ 0.5 mm.

7. The cover plate assembly (100) according to claim 4, characterized in that A second communication channel (B) is provided on at least one of the surface of the cover plate (40) facing the insulating plate (50) and the surface of the insulating plate (50) facing the cover plate (40), wherein one end of the second communication channel (B) is connected to the receiving space of the battery shell, and the other end is connected to the second gap space (b).

8. The cover plate assembly (100) according to claim 7, characterized in that: The insulating plate (50) is provided with an exhaust hole (54), the exhaust hole (54) is communicated with the receiving space of the battery shell, and the exhaust hole (54) is communicated with the second communication channel (B).

9. The cover plate assembly (100) according to claim 8, characterized in that: A liquid collection groove (53) is provided on the surface of the insulating plate (50) that is in contact with the cover plate (40), and the liquid collection groove (53) is communicated with the second gap space (b) and the second communication channel (B).

10. A battery, characterized in that: The invention comprises a battery casing, a battery cell and a cover plate assembly according to any one of claims 1 to 9, wherein the battery cell is arranged in the battery casing, and the cover plate assembly is covered on the battery casing.

11. A battery pack, characterized in that: The invention comprises a battery pack housing and the battery according to claim 10, wherein a plurality of the batteries are arranged in the battery pack housing.

12. An electrical device, characterized in that: The device comprises an electrical appliance and the battery pack according to claim 11, wherein the battery pack is used to supply power to the electrical appliance.

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