Battery cover plate assembly, battery and assembly sealing method

Abstract

The application discloses a battery cover plate assembly, a battery and an assembling sealing method, and relates to the technical field of battery sealing and insulation. The battery cover plate assembly comprises a cover plate sheet and a pole assembly. The cover plate sheet is provided with a pole hole. The pole assembly is fixedly connected with the cover plate sheet through the pole hole. The pole assembly comprises a pole body. The pole body comprises a columnar body and a plate-shaped body arranged around the bottom of the columnar body. A lower plastic is arranged between the cover plate sheet and the plate-shaped body. A sealing ring is arranged on the outer circumferential side of the columnar body. An upper plastic is further arranged between the cover plate sheet and the pole assembly. The upper plastic is arranged on the outer side of the sealing ring. The sealing ring is embedded in the space formed by the upper plastic, the pole hole, the lower plastic and the pole body. The application realizes multi-channel insulation sealing by designing the stepped structure of the lower plastic and matching the sealing ring and the pole body. The application avoids the insulation failure caused by the climbing of electrolyte between two metals on the surface of components.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of battery sealing and insulation, in particular to a battery cover plate assembly, a battery and a sealing assembly method. BACKGROUND

[0002] With the rapid development of new energy, power batteries are increasingly widely used. With the concept of extreme performance, extreme safety and extreme cost, the extreme safety performance of the battery cell is closely related to the safety of the vehicle and the consumer. The insulation performance of the insulation part of the battery cell, the sealing performance of the sealing part, the pressure relief rate and the pressure relief direction of the pressure relief mechanism are crucial to the safety performance of the battery cell.

[0003] The inventor found that the commonly used and mature structure of the cover plate assembly is a riveting structure, which compresses the sealing ring through the light cover plate and the pole, and cooperates with the lower plastic for insulation and sealing. However, due to the machining tolerance, assembly tolerance or unreasonable design of each part, a gap exists between the sealing ring and the lower plastic. Before the cover plate is used, the gap is filled with air, and a large voltage is required to break through the gap. Therefore, the cover plate will not fail due to insulation. However, during use, the cover plate will inevitably come into contact with humid gas or liquid. At this time, when the voltage is applied, the resistance at the gap position changes from air resistance to liquid or humid air resistance. The resistance is greatly reduced, the insulation fails, the shell voltage is too low, the shell or explosion-proof valve is corroded, or the shell voltage is too high, the self-discharge increases, the external insulation fails, and an explosion occurs.

[0004] On the other hand, in a typical design, the explosion-proof valve is arranged on the cover plate of the battery cell and arranged in the same direction as the positive and negative poles. When the explosion-proof valve is opened, a large amount of high-temperature, high-humidity and high-corrosion gas, liquid or solid material is sprayed from the explosion-proof valve, which is easy to contact the positive and negative poles of the adjacent battery cell or module, triggering further short circuit, and thus the entire battery pack is more likely to lose control. SUMMARY

[0005] The purpose of the present application is to provide a battery cover plate assembly, a battery and a sealing assembly method. By designing the stepped structure of the lower plastic and cooperating with the sealing ring and the pole body, multiple insulation and sealing are achieved, the electrolyte between the two metals is prevented from climbing on the surface of the part to cause insulation failure, and the problems of corrosion caused by low shell voltage, self-discharge and heat generation caused by high shell voltage, and conduction short circuit of positive and negative poles are avoided.

[0006] To solve the above technical problems, the present application is realized by the following technical scheme:

[0007] The first aspect of the present application provides a battery cover plate assembly.

[0008] The battery cover plate assembly comprises a cover plate sheet and a pole assembly, the cover plate sheet is provided with a pole hole, the pole assembly is fixedly connected with the cover plate sheet through the pole hole, the pole assembly comprises a pole body, the pole body comprises a columnar body and a plate-shaped body arranged around the bottom of the columnar body; a lower plastic is arranged between the cover plate sheet and the plate-shaped body, a sealing ring is arranged on the outer periphery of the columnar body, an upper plastic is further arranged between the cover plate sheet and the pole assembly, the upper plastic is sleeved outside the sealing ring, and the sealing ring is embedded in the space formed by the upper plastic, the pole hole, the lower plastic and the pole body.

[0009] Optionally, the lower plastic comprises a lower plastic body, a boss structure is arranged on the first end surface of the lower plastic body and extends downward, an inclined surface is arranged between the second end surface of the lower plastic and the upper surface of the boss structure, and a first step structure is formed between the upper surface of the boss structure and the inclined surface; the second end surface of the lower plastic upwardly extends to form a third end surface, and a second step structure is formed between the third end surface and the second end surface; the inner side end of the third end surface, the inclined surface and the inner side end surface of the boss structure are gradually close to the center of the lower plastic.

[0010] Optionally, the upper surface of the plate-shaped body is provided with a groove structure, and the groove structure is matched with the position and shape of the boss structure.

[0011] Optionally, the third end surface abuts against the lower surface of the cover plate sheet, and the lower surface of the sealing ring abuts against the intersection of the upper surface of the boss structure and the inclined surface; when the sealing ring is in an uncompressed state, a first swelling space is formed between the sealing ring and the inclined surface, and a second swelling space is formed between the inner side end surface of the third end surface and the sealing ring; when the sealing ring is in a compressed state, the compressed material of the sealing ring is embedded into the first swelling space and the second swelling space.

[0012] Optionally, the inner end of the upper plastic is respectively provided with an upper limiting portion and a lower limiting portion, the upper limiting portion abuts against the upper side end of the sealing ring, the inner side of the lower limiting portion abuts against the outer periphery of the sealing ring, and the outer side of the lower limiting portion abuts against the outer periphery of the cover plate sheet.

[0013] Optionally, the pole assembly further comprises an aluminum block, the aluminum block is arranged around the periphery of the columnar body, the upper plastic is arranged between the aluminum block and the cover plate sheet, the upper surface of the upper plastic abuts against the lower surface of the aluminum block, and the outer end of the upper plastic upwardly extends to wrap the periphery of the aluminum block.

[0014] Optionally, holes are arranged at the centers of the upper plastic, the lower plastic and the aluminum block, for accommodating the columnar body to pass through; the groove structure and the boss structure are both annularly arranged; and a liquid injection hole is further arranged on the cover plate sheet.

[0015] The second aspect of the present application provides a battery.

[0016] A battery comprises a shell, the shell is provided with the battery cover plate assembly as described in the first aspect on two opposite side walls, and the shell is provided with an explosion-proof valve on the other side wall away from the battery cover plate assembly.

[0017] The third aspect of the present application provides a sealing method for assembling the battery cover plate assembly.

[0018] The sealing method for assembling the battery cover plate assembly based on the first aspect comprises the following steps:

[0019] Determine the position of the pole column body;

[0020] Assemble the boss structure of the lower plastic into the groove structure of the plate-shaped body at the bottom of the pole column body, and then assemble the sealing ring to the peripheral side of the columnar body, at this time, the first swelling space is formed between the sealing ring and the inclined surface of the lower plastic, and the second swelling space is formed between the sealing ring and the inner side surface of the third end surface of the lower plastic;

[0021] Assemble the cover plate sheet, the upper plastic and the aluminum block in sequence, compress by tooling, and the compression material of the sealing ring enters the first swelling space first to block the electrolyte for the first time; when the first swelling space is filled, the compression material of the sealing ring continues to enter the second swelling space area to block the electrolyte for the second time.

[0022] Optionally:

[0023] When the electrolyte enters from the periphery of the plate-shaped body at the bottom of the pole column body, the compression material of the sealing ring filling the first swelling space blocks the electrolyte;

[0024] When the electrolyte enters between the lower plastic and the cover plate sheet, the compression material of the sealing ring filling the second swelling space blocks the electrolyte.

[0025] The present application has the following beneficial effects:

[0026] 1. The present application provides a battery cover plate assembly, a battery and a sealing method for assembling, by setting a multi-step structure on the lower plastic, forming a first swelling space and a second swelling space, and embedding the compression material of the sealing ring under pressure into the first swelling space and the second swelling space, thereby improving the sealing and insulation performance, effectively blocking the electrolyte from the periphery of the plate-shaped body by the compression material of the sealing ring embedded in the first swelling space, effectively blocking the electrolyte from entering between the lower plastic and the cover plate sheet by the compression material of the sealing ring embedded in the second swelling space, improving the insulation performance and sealing performance, and avoiding insulation failure.

[0027] 2、The upper plastic of the application realizes the insulation between the aluminum block and the cover plate, the upper limiting part of the upper plastic abuts against the upper side end of the sealing ring, the inner side of the lower limiting part abuts against the outer circumferential side of the sealing ring, and the outer side of the lower limiting part abuts against the outer circumferential side of the cover plate, thereby guaranteeing the insulation performance between the aluminum block, the pole and the cover plate.

[0028] 3、The extension part of the sealing ring overlaps with the cover plate, the overlapping part of the extension part of the sealing ring and the cover plate is a compression area of the sealing ring, after assembly, the expansion material in the compression area of the sealing ring forms compression material of the sealing ring, and the expansion material is embedded into the first expansion space and the second expansion space.

[0029] 4、The stepped structure of the lower plastic cooperates with the sealing ring and the pole body to realize multi-channel insulation sealing, thereby avoiding insulation failure caused by electrolyte creeping between two metals on the surface of parts, avoiding corrosion caused by low shell voltage, self-discharge and heat production increase caused by high shell voltage, and positive and negative short circuit.

[0030] 5、The shell of the battery is provided with an explosion-proof valve on the other side wall away from the battery cover plate assembly, and the explosion-proof valve is designed away from the pole body, so that thermal and electrical separation is realized, and the safety performance of the battery cell and the module is improved.

[0031] Of course, it is not necessary for any product implementing the present application to achieve all the advantages mentioned above. BRIEF DESCRIPTION OF DRAWINGS

[0032] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0033] Figure 1 It is a schematic diagram of the overall structure of the battery cover plate assembly of the first embodiment of the present application.

[0034] Figure 2 It is a sectional view of the battery cover plate assembly of the first embodiment of the present application.

[0035] Figure 3 It is Figure 2 It is a local enlarged schematic diagram of the sectional view of the battery cover plate assembly.

[0036] Figure 4 It is a sectional view of the lower plastic pole position of the first embodiment of the present application.

[0037] Figure 5 It is a schematic diagram of the overall structure of the pole body of the first embodiment of the present application.

[0038] Figure 6 Figure 1 is a sectional view of a pole column of the battery cover plate assembly of the present application;

[0039] Figure 7 Figure 2 is a schematic diagram of the overall structure of the battery of the present application.

[0040] Reference signs:

[0041] 1 battery cover plate assembly, 2 cover plate sheet, 3 pole column assembly, 4 pole column hole, 5 pole column, 6 columnar body, 7 plate-shaped body, 8 lower plastic, 9 sealing ring, 10 upper plastic, 11 first end face, 12 boss structure, 13 second end face, 14 inclined surface, 15 first stepped structure, 16 third end face, 17 second stepped structure, 18 groove structure, 19 first expansion space, 20 second expansion space, 21 upper limiting portion, 22 lower limiting portion, 23 aluminum block, 24 liquid injection hole, 25 battery, 26 shell, 27 explosion-proof valve, 28 negative electrode cover plate assembly, 29 positive electrode cover plate assembly, 30 flange surface, 31 sealing ring compression area; 32 lower plastic body;

[0042] L1. First stepped structure width; L2. Boss structure width; L3. Lower plastic pole column hole diameter; L4. Outer diameter of boss structure; L5. Inner diameter of groove structure; L6. Outer diameter of groove structure; H1. Height of boss structure; H2. Height of second expansion space; H3. Total thickness of lower plastic; H4. Depth of groove structure. DETAILED DESCRIPTION

[0043] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0044] Embodiment 1:

[0045] Please refer to Figure 1 The present embodiment provides a battery cover plate assembly with excellent insulation and sealing performance, improving the reliability of the cell structure. The specific structure includes a cover plate sheet 2 and a pole column assembly 3. The pole column hole 4 is arranged at the central position of the cover plate sheet 2, and the pole column assembly 3 is fixedly connected with the cover plate sheet 2 through the pole column hole 4. The liquid injection hole 24 is reserved on the cover plate sheet 2, which is convenient for injecting electrolyte solution after the cell installation is completed. Since the bottom of the entire battery 25 cover plate assembly 1 needs to contact the electrolyte solution, in order to prevent the electrolyte solution from seeping out from various angles and ensure that the battery 25 cover plate assembly 1 is soaked in the electrolyte solution, the electrolyte is prevented from entering between the two metal pieces of the assembly, and the battery 25 cover plate assembly 1 is prevented from being damaged by the electrolyte solution, thereby improving the reliability of the cell structure. Figure 1As can be seen, a lower plastic 8 is provided at the bottom of the entire battery 25 cover assembly 1.

[0046] An upper plastic layer is also provided between the cover plate 2 and the electrode assembly 3. Specifically, the electrode assembly 3 also includes an aluminum block 23, which is arranged around the upper periphery of the columnar body 6 and is adapted to the slot provided on the upper part of the columnar body 6. The upper plastic layer is provided between the aluminum block 23 and the cover plate 2, with the upper surface of the upper plastic layer abutting against the lower surface of the aluminum block 23, and the outer end of the upper plastic layer extending upward to wrap around the periphery of the aluminum block 23. This arrangement can better achieve insulation treatment.

[0047] like Figure 2 The figure shows a cross-sectional view of the battery cover assembly in this embodiment, illustrating the detailed structural configuration of the battery cover assembly. The terminal post assembly 3 in this embodiment includes a terminal post 5, which comprises two parts: a columnar body 6 and a plate-like body 7 surrounding the bottom of the columnar body 6. The columnar body 6 and the plate-like body 7 are integrally formed, and their material can be a copper-aluminum composite material. The columnar body 6 passes through the cover plate 2, and the end of the columnar body 6 away from the plate-like body 7 protrudes from the terminal post hole 4. A slot is provided on the upper part of the columnar body 6 to facilitate the installation of an aluminum block 23 that is compatible with the columnar body 6.

[0048] Considering the insulation performance between any two metal parts in the battery cover assembly, in this embodiment, there is a certain accommodating space between the terminal hole 4 in the center of the cover plate 2 and the columnar body 6. A sealing ring 9 is installed within this accommodating space, and the insulation and sealing performance of the sealing ring 9 achieves insulation between the cover plate 2 and the columnar body 6, and between the cover plate 2 and the plate-like body 7. Specifically, as shown... Figure 2 and Figure 3 As shown, the sealing ring 9 is entirely fitted around the outer periphery of the columnar body 6. The sealing ring 9 includes a columnar body and an extension portion. The extension portion is located at the bottom of the columnar body and abuts against the plate-shaped body 7. The lower plastic 8 between the cover plate 2 and the plate-shaped body 7, as well as the columnar body and extension portion of the sealing ring 9, effectively isolate the cover plate 2 from the columnar body 6 and the cover plate 2 from the plate-shaped body 7, avoiding direct contact and achieving an insulating and sealing effect.

[0049] When the sealing ring 9 mates with the upper plastic, in order to achieve a sealing and insulation effect, the upper plastic sleeve is entirely fitted over the outside of the sealing ring 9. The inner end of the upper plastic sleeve is provided with an upper limit part 21 and a lower limit part 22. The upper limit part 21 abuts against the upper end of the sealing ring 9, the inner side of the lower limit part 22 abuts against the outer periphery of the sealing ring 9, and the outer side of the lower limit part 22 abuts against the outer periphery of the cover plate 2. The sealing ring 9 is entirely embedded within the space formed by the upper plastic, the pole hole 4, the lower plastic 8, and the pole body 5.

[0050] In order to realize the stability of assembly, and at the same time consider the blocking of the penetration of the electrolyte solution, unlike the prior art, the specific structure of the lower plastic 8 is set in the embodiment. As shown in Figure 3 , Figure 4 The lower plastic 8 includes a lower plastic body 32, for the convenience of description, the lower surface is called the first end face 11, and the upper surface is called the second end face 13. The first end face 11 of the lower plastic body 32 extends downward and is provided with a boss structure 12. The boss structure 12 extends along the first end face 11 to the center position of the lower plastic 8. The inner side end of the boss structure 12 protrudes from the inner side surface of the lower plastic body 32, so that the top of the boss structure 12 forms a first stepped structure 15. Specifically, the second end face 13 of the lower plastic 8 and the upper surface of the boss structure 12 are provided with an inclined surface 14, and the first stepped structure 15 is formed between the upper surface of the boss structure 12 and the inclined surface 14;

[0051] The second end face 13 of the lower plastic 8 extends upward by a certain thickness to form a third end face 16. The second end face 13 and the third end face 16 form a second stepped structure 17.

[0052] As shown in Figure 4 The inner side end of the third end face 16, the inclined surface 14 and the inner side surface of the boss structure 12 are gradually arranged close to the center of the lower plastic 8 to form a plurality of stepped shapes. The plurality of stepped shapes are arranged to form a containing space for the compression material of the sealing ring 9, cooperate with the compression material of the sealing ring 9, strengthen the sealing effect, prevent the penetration of the electrolyte solution, and improve the overall insulation performance. When the battery 25 cover plate assembly 1 of the embodiment is completely assembled, the sealing ring 9 will be compressed, and the compression material will be embedded into the first expansion space 19 formed by the first stepped structure 15 and the second expansion space 20 formed by the second stepped structure 17, thereby enhancing the sealing effect and further preventing the penetration of the electrolyte solution.

[0053] In addition, the inner side end of the boss structure 12 protrudes from the inner side surface of the lower plastic body, and the second end face 13 of the lower plastic 8 and the upper surface of the boss structure 12 are provided with an inclined surface 14, which can well limit the extension part of the sealing ring 9 and facilitate the positioning of the sealing ring 9. Therefore, the inclined surface 14 has two functions. In addition to limiting the extension part of the sealing ring 9 as described above, the other function is to form the first expansion space 19 between the inclined surface 14 and the extension part of the sealing ring 9.

[0054] When the cover plate 2 and the parts thereon are not installed, the sealing ring 9 is in an uncompressed state, and has the same shape as in the natural state. A first swelling space 19 is formed between the sealing ring 9 and the inclined surface 14, and a second swelling space 20 is formed between the sealing ring 9 and the inner side surface of the third end surface 16. When the assembly is completed, the third end surface 16 abuts against the lower surface of the cover plate 2, and the lower surface of the sealing ring 9 abuts against the intersection of the upper surface of the boss structure 12 and the inclined surface 14. The sealing ring 9 is in a compressed state and deforms to a certain extent, and the compressed material of the sealing ring 9 is embedded into the first swelling space 19 and the second swelling space 20. As shown in Figure 3 , the part of the sealing ring 9 that overlaps the cover plate 2 is a sealing ring compressed area 31, and the swelling material in the sealing ring compressed area 31 forms the compressed material of the sealing ring 9 after the assembly is completed.

[0055] As shown in Figure 4 , Figure 5 , a groove structure 18 is arranged on the upper surface of the plate-shaped body 7, and the groove structure 18 is adapted to the position and shape of the boss structure 12, can limit the lower plastic 8, and facilitates the installation.

[0056] When the lower plastic 8, the sealing ring 9 and the cover plate 2 are assembled, first, the boss structure 12 of the lower plastic 8 is arranged in the groove structure 18 of the plate-shaped body 7, and the two are matched. After the matching, the inner surface of the boss structure 12 of the lower plastic 8 is flush with the flange surface 30 of the plate-shaped body 7. Then, the sealing ring 9 is assembled, and the sealing ring 9 is sleeved on the peripheral side of the columnar body 6. Then, the cover plate 2, the upper plastic and the aluminum block 23 are assembled, and are compressed by a tool. At this time, the sealing ring 9 is compressed, and the compressed material of the sealing ring 9, i.e., the swelling material, first enters the first swelling space 19 to block the electrolyte. When the electrolyte enters from the periphery of the plate-shaped body 7, the position is blocked.

[0057] When the first swelling space 19 is filled, the swelling material continues to enter the second swelling space 20, and at this time, the electrolyte is blocked for the second time. When the electrolyte enters from between the lower plastic 8 and the cover plate 2, the position is blocked. In this way, even if the sealing ring 9, the lower plastic 8 and the pole column body 5 have a size tolerance and an assembly tolerance that are not well controlled, the electrolyte will not enter between the two metals to cause insulation failure, thereby eliminating the shell corrosion at low voltage and the self-discharge increase at high voltage of the shell.

[0058] As shown in Figure 4 and Figure 6 , the diameter of the pole column hole 4 of the lower plastic 8 is L3, and the inner diameter of the groove structure 18 of the pole column body 5 is L5, and L3-L5≤0.4mm.

[0059] The sealing ring 9 diameter > L3 > L5, the sealing ring 9 diameter - L3 = 0.1mm, 2*L1+L3-sealing ring 9 diameter = 0.2mm;

[0060] The width of the lower plastic boss structure 12 is L2, satisfying 2*L2+L3=L4, and L4 is the outer diameter of the boss structure 12;

[0061] The outer diameter of the pole body groove structure 18 is L6, L6>L4, and L6-L4 = 0.1mm;

[0062] The height H1 of the lower plastic boss structure 12, the height H2 of the second expansion space 20, the total thickness H3 of the lower plastic 8, and the depth H4 of the pole groove structure 18 satisfy 0mm≤H4-H1≤0.3mm, 0.2mm≤H2<H3, and 0.2mm≤H3-H2≤0.5mm.

[0063] In the overall sealing and insulation performance of the battery cover plate assembly of the embodiment:

[0064] (1) The aluminum block 23 and the cover plate sheet 2 are insulated by the upper plastic;

[0065] (2) The cylindrical body 6 part of the pole body 5 and the cover plate sheet 2 are insulated by the upper plastic and the sealing ring 9, and are sealed by the compression of the two, preventing external liquid from entering and causing insulation failure;

[0066] (3) The cover plate sheet 2 and the plate-shaped body 7 part of the pole body 5 are insulated and sealed by the sealing ring 9 and the lower plastic 8.

[0067] Therefore, through the stepped structure of the lower plastic 8 and the cooperation with the sealing ring 9 and the pole body 5, multiple insulation and sealing are achieved, thereby avoiding the insulation failure caused by the electrolyte climbing between two metals, avoiding the corrosion caused by the low shell voltage, the self-discharge and heat generation caused by the high shell voltage, and the conduction short circuit of the positive and negative electrodes.

[0068] Embodiment two:

[0069] Please refer to Figure 7 The embodiment provides a battery.

[0070] A battery comprises a shell 26, wherein opposite two side walls of the shell 26 are provided with the battery 25 cover plate assembly 1 as described in embodiment one, and the other side wall of the shell 26 away from the battery 25 cover plate assembly 1 is provided with an explosion-proof valve 27.

[0071] The battery 25 comprises a shell 26, which can be a steel shell or an aluminum shell. The steel shell can be stainless steel, nickel-plated steel, etc. The aluminum shell can be 3003 aluminum, 3006 aluminum, etc. The shell 26 can have equal or unequal wall thickness. The shell 26 is provided with an explosion-proof valve 27 on the side. The explosion-proof valve 27 can be one or more. The explosion-proof valve 27 can be welded to the shell 26 or integrally formed with the shell 26. The explosion-proof valve 27 is provided with a protective patch on the outside to prevent damage during the process.

[0072] The shell 26 is provided with an explosion-proof valve 27 on the side away from the battery 25 cover plate assembly 1. The explosion-proof valve 27 is designed away from the pole body 5, which can achieve thermal-electric separation and improve the safety performance of the battery cell and the module.

[0073] The shell 26 is provided with a battery 25 cover plate assembly 1 on the opposite two side walls. It can be understood that the two battery 25 cover plate assemblies 1 are positive cover plate assembly 29 and negative cover plate assembly 28, which can realize the transmission of the internal current of the battery cell to the module or the battery pack. The positive cover plate assembly 29 comprises a positive pole assembly 3, a cover plate sheet 2, a liquid injection hole 24 and a lower plastic 8. The positive pole assembly 3 comprises an aluminum block 23, a positive pole body 5, a positive upper plastic and a positive sealing ring 9. The positive conductive pole comprises a cylindrical body part and a bottom plate body part, which is an integral structure.

[0074] The negative cover plate assembly 28 comprises a negative pole assembly 3, a cover plate sheet 2, a liquid injection hole 24 and a lower plastic 8. The negative pole assembly 3 comprises an aluminum block 23, a negative pole body 5, a negative upper plastic and a negative sealing ring 9. The negative conductive pole comprises a cylindrical body part and a bottom plate body part, which is an integral structure.

[0075] The positive aluminum block 23 and the cover plate sheet 2 are insulated by the positive upper plastic. The positive pole body 5 and the cover plate sheet 2 are insulated by the positive sealing ring 9 and the lower plastic 8, and the sealing performance is realized by the positive sealing ring 9. The negative aluminum block 23 and the cover plate sheet 2 are insulated by the negative upper plastic. The negative pole body 5 and the cover plate sheet 2 are insulated by the negative sealing ring 9 and the lower plastic 8, and the sealing performance is realized by the negative sealing ring 9.

[0076] The battery 25 with the above structure can ensure that the electrolyte cannot enter between the two metal pieces when the positive cover plate assembly 29 and the negative cover plate assembly 28 are soaked in the electrolyte, avoiding the problem of insulation failure of the battery 25 in the use process or the cover plate assembly in the weather resistance verification due to the presence of electrolyte or in a high-humidity environment, thereby avoiding the corrosion of the shell 26 caused by the low shell voltage of the battery cell, or the increase of self-discharge caused by the high shell voltage, or the safety problem of direct micro-short circuit of the positive and negative poles.

[0077] On the other hand, the battery cell with the cover plate assembly, the explosion-proof valve 27 is designed away from the positive and negative poles, realizing thermal and electrical separation, through the above two ways, the ultimate safety of the battery cell is realized.

[0078] Embodiment three:

[0079] The embodiment provides a sealing method for assembling a battery cover plate assembly.

[0080] The sealing method for assembling the battery cover plate assembly comprises the following steps:

[0081] Determine the position of the pole body 5;

[0082] The boss structure 12 of the lower plastic 8 is assembled into the groove structure 18 of the bottom plate body 7 of the pole body 5, and then the sealing ring 9 is assembled to the side of the columnar body 6, at this time, the first swelling space 19 is formed between the sealing ring 9 and the inclined surface 14 of the lower plastic 8, and the second swelling space 20 is formed between the sealing ring 9 and the inner side surface of the third end surface 16 of the lower plastic 8;

[0083] The cover plate sheet 2, the upper plastic and the aluminum block 23 are assembled in sequence, the sealing ring 9 is compressed by pressing with a tool, the compressed material of the sealing ring 9 enters the first swelling space 19 first, and the electrolyte is blocked in the first way; when the first swelling space 19 is filled, the compressed material of the sealing ring 9 continues to enter the second swelling space 20 area, and the electrolyte is blocked in the second way.

[0084] Further:

[0085] When the electrolyte enters from the periphery of the plate body 7 at the bottom of the pole body 5, the compressed material of the sealing ring 9 filling the first swelling space 19 blocks the electrolyte;

[0086] When the electrolyte enters between the lower plastic 8 and the cover plate sheet 2, the compressed material of the sealing ring 9 filling the second swelling space 20 blocks the electrolyte.

[0087] In the description of the present specification, the description of the terms "one embodiment", "example", "specific example" and the like means that the specific features, structures, materials or characteristics described in combination with the embodiment or example are contained in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0088] The preferred embodiments of the application disclosed above are only to facilitate the elucidation of the application. The preferred embodiments do not describe all the details of the application and limit the application to the specific embodiments described. Obviously, many modifications and variations can be made in light of the teachings above. The description is chosen and described in order to best explain the principles of the application and its practical application to thereby enable others skilled in the art to best utilize the application and get the best results from the application. The application is only limited by the claims and their full scope and equivalents.

Claims

1. A battery cover plate assembly, characterized by, The application relates to a battery cover plate assembly, which comprises a cover plate sheet and a pole column assembly, the cover plate sheet is provided with a pole column hole, the pole column assembly is fixedly connected with the cover plate sheet through the pole column hole, the pole column assembly comprises a pole column body, the pole column body comprises a columnar body and a plate-shaped body arranged around the bottom of the columnar body, a lower plastic is arranged between the cover plate sheet and the plate-shaped body, a sealing ring is arranged on the outer periphery of the columnar body, an upper plastic is further arranged between the cover plate sheet and the pole column assembly, the upper plastic is arranged outside the sealing ring, and the sealing ring is embedded in a space formed by the upper plastic, the pole column hole, the lower plastic and the pole column body. The lower plastic comprises a lower plastic body, a boss structure is arranged on the first end surface of the lower plastic body and extends downwards, an inclined surface is arranged between the second end surface of the lower plastic and the upper surface of the boss structure, and a first step structure is formed between the upper surface of the boss structure and the inclined surface; the second end surface of the lower plastic extends upwards to form a third end surface, a second step structure is formed between the third end surface and the second end surface, and the inner side end of the third end surface, the inclined surface and the inner side end surface of the boss structure gradually approach the center of the lower plastic; The third end surface abuts against the lower surface of the cover plate sheet, and the lower surface of the sealing ring abuts against the upper surface of the boss structure; when the sealing ring is in an uncompressed state, a first material swelling space is formed between the sealing ring and the inclined surface, and a second material swelling space is formed between the sealing ring and the inner side end surface of the third end surface; when the sealing ring is in a compressed state, the compressed material of the sealing ring is embedded into the first material swelling space and the second material swelling space.

2. The battery cover plate assembly of claim 1, wherein, The upper surface of the plate-shaped body is provided with a groove structure which is matched with the position and shape of the boss structure.

3. The battery cover plate assembly of claim 1, wherein, The inner end of the upper plastic is respectively provided with an upper limiting part and a lower limiting part, the upper limiting part abuts against the upper side end of the sealing ring, the inner side of the lower limiting part abuts against the outer periphery of the sealing ring, and the outer side of the lower limiting part abuts against the outer periphery of the cover plate sheet.

4. The battery cover plate assembly of claim 2, wherein, The pole column assembly further comprises an aluminum block which is arranged around the periphery of the columnar body, the upper plastic is arranged between the aluminum block and the cover plate sheet, the upper surface of the upper plastic abuts against the lower surface of the aluminum block, and the outer end of the upper plastic extends upwards to wrap the periphery of the aluminum block.

5. The battery cover plate assembly of claim 4, wherein, Holes are arranged at the centers of the upper plastic, the lower plastic and the aluminum block for accommodating the columnar body, the groove structure and the boss structure are both annularly arranged, and a liquid injection hole is further arranged on the cover plate sheet.

6. A battery, characterized by The application further relates to a battery, which comprises a shell, opposite side walls of the shell are provided with the battery cover plate assemblies as claimed in any one of claims 1 to 5, and the other side wall of the shell away from the battery cover plate assemblies is provided with an explosion-proof valve.

7. A method of assembling a seal for a battery cover plate assembly according to any one of claims 1 to 5, wherein, The application further relates to a battery manufacturing method, which comprises the following steps: determining the position of the pole column body; assembling the boss structure of the lower plastic into the groove structure of the plate-shaped body at the bottom of the pole column body, and then assembling the sealing ring to the periphery of the columnar body, so that the first material swelling space is formed between the sealing ring and the inclined surface of the lower plastic, and the second material swelling space is formed between the sealing ring and the inner side end surface of the third end surface of the lower plastic; The cover plate piece, the upper plastic and the aluminum block are assembled in sequence, are compressed through a tool, the compression material of the sealing ring is compressed, the compression material of the sealing ring enters the first expansion space first, and the electrolyte is blocked for the first time; when the first expansion space is filled, the compression material of the sealing ring continues to enter the second expansion space area, and the electrolyte is blocked for the second time.

8. The method of claim 7, wherein: When the electrolyte enters from the periphery of the plate-shaped body at the bottom of the pole body, the electrolyte is blocked by the compression material of the sealing ring filling the first expansion space; When the electrolyte enters between the lower plastic and the cover plate piece, the electrolyte is blocked by the compression material of the sealing ring filling the second expansion space.

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