Built-in pole, cover plate structure and battery cell unit

Abstract

The invention relates to the technical field of batteries, and provides a built-in pole, a cover plate structure and a battery cell unit.The built-in pole comprises a first pole connecting body, a first connecting part is formed on the first pole connecting body, and the first connecting part is configured to be capable of being connected with a second connecting part; and the first pole connector can limit the pole core. The cover plate structure comprises an external pole connected to the shell cover, the external pole comprises a second pole connector, and a second connecting part is formed on the second pole connector and used for being connected with the first connecting part. According to the embodiment of the invention, the energy density of the battery cell unit can be improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a built-in pole, a cover plate structure and a battery cell unit. Background Art

[0002] The main function of the cover plate structure is to encapsulate the pole core in the shell. At the same time, the pole core encapsulated in the shell needs to be limited to prevent the pole core from shaking in the shell. The cover plate structure is provided with a stop frame on the side facing the pole core. In order to ensure the limiting effect on the pole core, the thickness of the stop frame is generally designed to be thicker. The stop frame will occupy the space in the shell, thereby affecting the energy density of the battery cell unit. Summary of the invention

[0003] The present application provides a built-in pole, a cover plate structure and a battery cell unit, which can improve the energy density of the battery cell unit.

[0004] A first aspect of the present application provides a built-in pole, comprising:

[0005] A first pole connector is provided with a first connection portion, the first connection portion is configured to be connected to the second connection portion, and the first pole connector can limit the pole core.

[0006] According to the built-in pole described in the first aspect of the present application, the first pole connector can be connected to the second connecting part of the second pole connector through the first connecting part, thereby realizing the connection between the built-in pole and the external pole. The built-in pole and the external pole can form a complete pole. In the complete pole, the first pole connector can limit the pole core, so that the built-in pole can limit the pole core together with the stop frame. The stop frame can be designed to be thinner, thereby releasing a larger installation space for the pole core. The pole core has a higher space occupancy in the shell, thereby being able to improve the energy density of the battery unit.

[0007] In a possible implementation manner, the first connecting portion is configured to be embedded in the second connecting portion.

[0008] In a possible implementation, the first connection portion is an external thread formed on an outer circumference of the first pole connector.

[0009] In a possible implementation, the built-in pole further includes:

[0010] A connecting piece, wherein the connecting piece is connected to the first pole connector.

[0011] In a possible implementation, the built-in pole further includes:

[0012] A flexible connector is connected between the first pole connector and the connecting piece.

[0013] A second aspect of the present application provides a cover plate structure, comprising:

[0014] Shell cover;

[0015] A stop frame, arranged on one side of the shell cover;

[0016] and an external pole connected to the shell cover, wherein the external pole includes a second pole connector, wherein the second pole connector is formed with a second connecting portion for connecting with the first connecting portion.

[0017] According to the cover structure described in the second aspect of the present application, the external pole and the internal pole can form an integral pole. In the integral pole, since the internal pole is located on the inner side of the cover structure, the internal pole can exert a force on the pole core to exert a certain restrictive effect on the pole core, so that the stop frame arranged on the shell cover can be designed to be thinner, thereby releasing a larger installation space for the pole core. The pole core has a higher space occupancy in the shell, thereby being able to improve the energy density of the battery unit.

[0018] In a possible implementation manner, the second pole connector is formed with an inner cavity, and the first pole connector can be received in the inner cavity.

[0019] In a possible implementation manner, an internal thread is formed in the inner cavity.

[0020] In a possible implementation, the shell cover is formed with a mounting hole, the second pole connector is arranged at the mounting hole, and the cover plate structure further includes:

[0021] A sealing insulating layer is disposed between the shell cover and the second pole connector and covers the periphery of the mounting hole.

[0022] In a possible implementation, the second pole connector is formed with a concave section, the concave section includes a first surface, a second surface and a third surface, the first surface is opposite to the outer surface of the shell cover, the second surface is opposite to the periphery of the mounting hole, the third surface is opposite to the inner surface of the shell cover, and the sealing insulation layer includes:

[0023] A first section is filled between the outer surface of the shell cover and the first surface;

[0024] A second section is filled between the periphery and the second surface;

[0025] and a third section filled between the inner surface and the third surface.

[0026] In a possible implementation manner, the periphery is further formed with a step on one side of the inner surface.

[0027] In a possible implementation, the stop frame is a hollow structure and the inner side surface of the stop frame is in a grid shape.

[0028] A third aspect of the present application provides a battery cell unit, comprising the cover plate structure described in the first aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings required for use in the embodiments or the prior art description are briefly introduced below. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0030] Figure 1 A schematic structural diagram of a cover plate structure provided according to an embodiment of the present application is shown;

[0031] Figure 2 A partial enlarged view of a cover plate structure provided according to an embodiment of the present application is shown;

[0032] Figure 3 Shows Figure 1 The view along the A direction in the middle;

[0033] Figure 4 Shows Figure 1 The view along the B direction;

[0034] Figure 5 A schematic structural diagram of a built-in pole provided according to an embodiment of the present application is shown.

[0035] Reference numerals:

[0036] 100-shell cover; 101-mounting hole; 1011-periphery; 1011a-step;

[0037] 200-stop frame; 210-first stop frame; 220-second stop frame; 230-third stop frame;

[0038] 300-external pole; 310-second pole connector; 311-second connecting portion; 312-inner cavity; 313-inner concave section; 3131-first surface; 3132-second surface; 3133-third surface;

[0039] 400-sealed insulating layer; 410-first section; 420-second section; 430-third section;

[0040] 500-liquid injection structure; 510-liquid injection hole; 520-cover plate;

[0041] 600-explosion-proof structure; 610-explosion-proof disk;

[0042] 700-built-in pole; 710-first pole connector; 720-connecting piece; 730-flexible connector; 711-first connecting portion; 721-third connecting surface; 731-first connecting surface; 732-second connecting surface;

[0043] 10- positive electrode column;

[0044] 20-Negative pole. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0046] The battery cell unit usually includes a shell, a cover plate structure and a pole core. The shell has a mounting cavity and at least one end is open. The pole core is installed in the shell. The cover plate structure is installed at the end of the shell and closes the opening of the shell. The pole core usually includes a positive electrode sheet, a negative electrode sheet and a diaphragm arranged between the positive electrode sheet and the negative electrode sheet. The positive electrode sheet is formed with a positive electrode ear, and the negative electrode sheet is formed with a negative electrode ear.

[0047] The main function of the cover plate structure is to encapsulate the pole core in the shell. In addition, the cover plate structure also serves to limit the pole core and to form an electrical connection with the pole core. In order to realize its limiting function on the pole core, the cover plate structure usually needs to set a stop frame on the side of the cover plate structure facing the pole core. The stop frame can cooperate with the pole core in structure to limit the pole core in the shell. In order to realize the electrical connection between the cover plate structure and the pole core, the outer side of the cover plate structure is usually provided with a positive pole column and a negative pole column. The connection between the pole core and the cover plate structure can be realized by connecting the positive pole ear to the positive pole column and the negative pole ear to the negative pole column. The positive pole column can be used as the positive terminal of the battery cell unit, and the negative pole column can be used as the negative terminal of the battery cell unit.

[0048] In order to ensure the limiting effect on the pole core, the stop frame needs to have a high structural strength. The stop frame is generally designed to be thicker. When the stop frame is located on the inner side of the shell, the stop frame will occupy more space in the shell, resulting in the installation space of the pole core being limited, which will reduce the energy density of the battery unit.

[0049] Based on the above status quo and problems, the present application provides a cover plate structure, in which the positive pole and / or negative pole on the cover plate structure adopts a pole structure that is different from the transmission technology, and the pole structure adopts a split structure that can be disassembled. For the convenience of description and understanding, the pole structure can be split into two components as an example for explanation, wherein the first part is arranged on the outside of the cover plate structure so as to form a connection with the electricity and provide electrical energy to the electrical equipment, and the second part can be connected to the cover plate structure and form a complete pole structure with the first part, and the second part is located on the inner side of the cover plate structure, and the second part can form a force on the pole core to exert a certain restrictive effect on the pole core, and at least one of the positive pole and the negative pole on the cover plate structure adopts the split structure.

[0050] In the above-mentioned cover plate structure, since the second part in the pole can have a certain restrictive effect on the pole core, the second part can jointly complete the restrictive effect on the pole core with the stop frame. Therefore, the stop frame can be designed to be thinner, thereby releasing a larger installation space for the pole core. The pole core has a higher space occupancy in the shell, thereby being able to improve the energy density of the battery unit.

[0051] Under the above concept, the embodiment of the present application provides a built-in pole, which can be manufactured and used separately as a part of the pole structure, and the built-in pole is the second part. The built-in pole can form a complete pole after being matched with the first part on the cover plate structure, so as to realize the electrical connection between the pole core and the pole.

[0052] On the other hand, for the connection between the pole and the pole core, a connecting piece is usually provided between the pole and the pole core, and the connecting piece is connected between the pole and the pole core by welding (usually two welding processes are required). In order to further increase the space occupied by the pole core, the built-in pole can be designed to be more compact. In this regard, in some embodiments of the present application, the connecting piece can be integrated into the built-in pole, and these embodiments will be described in detail below.

[0053] In the embodiments of the present application, it should be noted that the descriptions of "inside" and "outside" can be understood as being based on the interior of the battery cell unit. For example, the inside of the cover structure refers to the side of the cover structure facing the interior of the battery cell unit, and the outside of the cover structure refers to the side of the cover structure away from the interior of the battery cell unit. It should be understood that in the following embodiments, the aforementioned understanding can be made for the inside and outside of different features, that is, the inside of a feature refers to the side of the feature facing the battery cell unit, and the outside of a feature refers to the side of the feature away from the interior of the battery cell unit. In addition, the same understanding can be made for "inner surface", "outer surface", etc. in the following embodiments.

[0054] In the embodiments of the present application, it should be noted that the positive electrode column and the negative electrode column on the cover plate structure can simultaneously adopt a front split structure, or one of the positive electrode column and the negative electrode column can adopt a split structure. In the following embodiments, the specific structure of the electrode column (such as the positive electrode column) will be described by taking the electrode column adopting the split structure as an example.

[0055] Figure 1 A structural schematic diagram of a cover plate structure provided according to an embodiment of the present application is shown.

[0056] In the examples of this application, please refer to Figure 1 The cover plate 520 structure includes a shell cover 100 , a stop frame 200 and an external pole 300 .

[0057] The housing cover 100 is a main supporting structure of the cover plate 520 structure, which can be made of metal materials such as aluminum. The stop frame 200 and the external pole 300 can be installed on the housing cover 100 .

[0058] The shell cover 100 can be designed as a flat plate structure or other structures. Taking the flat plate structure as an example, it can be connected to the shell of the battery cell unit, that is, the edge of the shell cover 100 can cover the end of the shell, or the edge of the shell cover 100 can abut the inner surface of the shell. In order to achieve the reliability of the connection between the two, a circle of first steps can be formed on the edge of the shell cover 100, and a circle of second steps can be formed on the top of the shell. The first step can be connected to the second step to ensure the connection reliability and uniformity of the appearance of the battery cell unit.

[0059] The stop frame 200 is attached to one side of the shell cover 100, specifically, it can be attached to the inner surface of the shell cover 100. The stop frame 200 is formed with a limiting structure that can limit the pole core. The limiting structure can be set according to the specific shape of the pole core. According to the different heights at different positions of the pole core, the limiting structure can present a structural form with undulating heights. For example, corresponding to the higher part of the pole core, the limiting structure is correspondingly designed to be thinner, and corresponding to the lower part of the pole core, the limiting structure is correspondingly designed to be thicker. The limiting of the pole core is achieved by coordinating the thickness and height.

[0060] In addition, other auxiliary structures may also be provided on the stop frame 200 to achieve the limitation of the pole core. These auxiliary structures may be, for example, limiting protrusions, limiting ribs, etc.

[0061] The stop frame 200 can be made of a high temperature resistant and corrosion resistant material, such as polymer plastic, etc. It should be understood that the material of the stop frame 200 can also be specifically selected according to actual needs.

[0062] The external pole 300 is connected to the housing cover 100 . The external pole 300 includes a second pole connector 310 . The second pole connector 310 is formed with a second connecting portion 311 . The second connecting portion 311 is used to form a connection with the first connecting portion 711 .

[0063] The external pole 300 is the above-mentioned first part. The second connecting portion 311 on the external pole 300 can be connected to the first connecting portion 711 on the internal pole 700 as the second part, so that the external pole 300 and the internal pole 700 can form an integral pole. In the integral pole, since the second portion is located on the inner side of the cover plate 520 structure, the second portion can form a force on the pole core to exert a certain restriction on the pole core, so that the stop frame 200 arranged on the shell cover 100 can be designed to be thinner, thereby releasing a larger installation space for the pole core, and the pole core has a higher space occupancy in the shell, thereby being able to improve the energy density of the battery unit.

[0064] In the embodiment of the present application, the internal pole 700 and the external pole 300 may be connected in a variety of ways, including but not limited to plug-in connection, snap-fit ​​connection, and threaded connection.

[0065] Taking plug-in as an example, at least one plug-in slot can be formed in the external pole 300, and at least one plug-in post can be formed on the internal pole 700. The internal pole 700 can be connected to the external pole 300 by inserting the plug-in post into the plug-in slot. To ensure the reliability of plug-in, the plug-in slot can be designed to be a structure with a large outside and a small inside, for example, multiple plug-in slots are arranged in a zigzag shape, thereby improving the bonding force between the plug-in post and the plug-in slot. In this plug-in method, the plug-in slot forms the second connection portion 311, and the plug-in post forms the first connection portion 711.

[0066] Taking the snap-fit ​​connection as an example, a first snap-fit ​​portion can be provided on the external pole 300, and a second snap-fit ​​portion can be provided on the internal pole 700. After the second snap-fit ​​portion is installed on the first snap-fit ​​portion, the first snap-fit ​​portion can be moved and fastened on the second snap-fit ​​portion. To improve the connection reliability, the number of first snap-fit ​​portions can be multiple, and the multiple first snap-fit ​​portions are distributed circumferentially on the periphery of the second snap-fit ​​portion. In the modified snap-fit ​​connection mode, the second snap-fit ​​portion forms the second connection portion 311, and the first snap-fit ​​portion forms the first connection portion 711.

[0067] Taking threaded connection as an example, an internal thread can be formed on the external pole 300, and an external thread can be formed on the internal pole 700, and the external pole 300 and the internal pole 700 can be connected by screwing the internal pole 700 into the external pole 300. In this threaded connection, the internal thread forms the second connection portion 311, and the external thread forms the first connection portion 711.

[0068] The embodiments of the present application are mainly described using a threaded connection as an example. The threaded connection has a simple structure, reliable connection and is easy to manufacture. Using a threaded connection to connect the external pole 300 and the internal pole 700 can improve the overall stability of the battery cell unit and reduce the manufacturing cost of the battery cell unit.

[0069] Figure 2 A partial enlarged view of a cover plate structure provided according to an embodiment of the present application is shown. Figure 1 and Figure 2 The second pole connector 310 forms an inner cavity 312 , and the first pole connector 710 can be received in the inner cavity 312 .

[0070] The shape of the inner cavity 312 is adapted to the shape of the first pole connector 710, so that when the first pole connector 710 is accommodated in the inner cavity 312, all parts of the first pole connector 710 can form a close contact with the second pole connector 310, so that the current can flow smoothly from the second pole connector 310 to the first pole connector 710.

[0071] As for the aforementioned plug-in method, the inner cavity 312 can be used as a plug-in slot. As for the aforementioned threaded connection method, the inner cavity 312 is the position where the internal thread is formed. For details, please refer to Figure 2 The inner wall surface of the inner cavity 312 is formed with an internal thread.

[0072] In some embodiments, please refer to Figure 2 The shell cover 100 is formed with a mounting hole 101, the second pole connector 310 is arranged at the mounting hole 101, and the cover plate 520 structure also includes a sealing insulation layer 400, which is arranged between the shell cover 100 and the second pole connector 310 and covers the periphery 1011 of the mounting hole 101.

[0073] It should be noted that the periphery 1011 refers to a related structure on the shell cover 100, and the periphery 1011 is located at the location of the mounting hole 101. After the mounting hole 101 is formed on the shell cover 100, the edge structure of the mounting hole 101 forms the periphery 1011. During assembly, the second pole connector 310 can be inserted into the mounting hole 101, and then the sealing insulation layer 400 is provided between the second pole connector 310 and the periphery 1011 to mount the second pole connector 310 on the shell cover 100.

[0074] In combination with the above, the shell cover 100 can be made of metal materials such as aluminum, and the second pole connector 310 is a part of the pole that needs to be exposed, which plays a conductive role. In order to prevent a short circuit between the shell cover 100 and the second pole connector 310, a sealing insulating layer 400 needs to be provided between the two. In the above embodiment, by providing the sealing insulating layer 400 on the periphery 1011 covering the mounting hole 101, a good connection and insulation effect can be achieved.

[0075] In order to form a more stable connection, the portion of the second pole connector 310 that needs to extend into the mounting hole 101 can be designed as a concave structure. For example, the second pole connector 310 can include a concave section 313, so that the sealing insulation layer 400 can be wrapped around the periphery 1011 on the one hand, and on the other hand, the sealing insulation layer 400 can also be embedded in the concave section 313, so that the connection between the periphery 1011, the sealing insulation layer 400 and the second pole connector 310 is more reliable.

[0076] The sealing insulating layer 400 can be made of rubber, silicone, plastic, PTFE, polyurethane and other materials. These materials can be made into glue, and then injected into the space between the second pole connector 310 and the periphery 1011 by injection molding. A stable sealing insulating layer 400 can be formed between the second pole connector 310 and the periphery 1011 by properly configuring the curing time and temperature.

[0077] In some embodiments, please refer to Figure 2 The second pole connector 310 is formed with a concave section 313, the concave section 313 includes a first surface 3131, a second surface 3132 and a third surface 3131, the first surface 3131 is opposite to the outer surface of the shell cover 100, the second surface 3132 is opposite to the periphery 1011 of the mounting hole 101, and the third surface 3131 is opposite to the inner surface of the shell cover 100, the sealing insulation layer 400 includes a first section 410, a second section 420 and a third section 430, the first section 410 is filled between the outer surface of the shell cover 100 and the first surface 3131, the second section 420 is filled between the periphery 1011 and the second surface 3132, and the third section 430 is filled between the inner surface and the third surface 3131.

[0078] For the above-mentioned sealing insulation layer 400, the first section 410 can form a seal and insulation between the outer surface of the shell cover 100 and the first surface 3131 of the second pole connector 310, the second section 420 can form a seal and insulation between the periphery 1011 of the shell cover 100 and the second surface 3132 of the second pole connector 310, and the third section 430 can form a seal and insulation between the inner surface of the shell cover 100 and the third surface 3131 of the second pole connector 310. The three-section sealing design of the sealing insulation layer 400 can effectively improve the insulation effect and sealing effect between the shell cover 100 and the second pole connector 310.

[0079] On the basis of the above-mentioned sealing insulating layer 400 , by reasonably configuring the widths of the first section 410 , the second section 420 and the third section 430 , the connection strength between the shell cover 100 , the sealing insulating layer 400 and the second pole connector 310 can be effectively improved.

[0080] For example, in some embodiments, see Figure 2 The first section 410 and the third section 430 have smaller widths, while the second section 420 has a larger width, which can avoid forming a thicker sealing insulation layer 400 on the inner and outer surfaces of the shell cover 100, and is beneficial to ensuring the structural uniformity of the cover plate 520. The thicker width of the second section 420 indicates that there is more glue between the periphery 1011 and the second pole connector 310, thereby improving the connection strength between the shell cover 100, the sealing insulation layer 400 and the second pole connector 310.

[0081] It can be understood that the above embodiments are described by taking the formation of one concave section 313 on the second pole connector 310 as an example. In other embodiments, more concave sections 313 can be formed on the second pole connector 310, for example, two, three or four, etc. Multiple concave sections 313 can be formed on the portion of the second pole connector 310 that extends into the mounting hole 101, and the multiple concave sections 313 can be arranged at equal intervals or at non-equal intervals.

[0082] Similarly, for the shell cover 100, multiple peripheral edges 1011 can be layered on the edge of the mounting hole 101, and each peripheral edge 1011 can be matched with the aforementioned concave section 313. Therefore, when the sealing insulating layer 400 is formed by the aforementioned liquid injection method, the sealing insulating layer 400 filled between the shell cover 100 and the second pole connector 310 can have a more complex structure, which can provide more connection points, thereby improving the connection reliability between the shell cover 100 and the second pole connector 310.

[0083] In some embodiments, please refer to Figure 2A step 1011 a is formed on one side of the inner surface of the peripheral edge 1011 , and the step 1011 a can form an escape space, thereby providing an installation space for the built-in pole 700 .

[0084] Figure 3 Shows Figure 1 The view along the A direction; Figure 4 Shows Figure 1 In some embodiments, please refer to Figure 3 and Figure 4 The stop frame 200 is a hollow structure and the inner side surface of the stop frame 200 is a grid shape.

[0085] The stop frame 200 has higher elasticity. When the battery cell unit vibrates, the stop frame 200 can provide sufficient buffering effect for the battery cell unit, thereby avoiding damage to the battery cell unit.

[0086] In some embodiments, please refer to Figure 1 The shell cover 100 is also provided with a liquid injection structure 500 for injecting electrolyte into the battery cell unit.

[0087] The injection structure 500 may include an injection hole 510 and a cover plate 520 covering the injection hole 510, and the cover plate 520 has an open state and a closed state. When in the open state, the injection hole 510 is connected to the internal space of the battery cell unit, and electrolyte can be injected into the battery cell unit. When in the closed state, the injection hole 510 is closed.

[0088] In some embodiments, please refer to Figure 1 The shell cover 100 is also provided with an explosion-proof structure 600 for relieving pressure when the internal temperature of the battery cell unit is too high.

[0089] The explosion-proof structure 600 may include an explosion-proof plate 610 , etc. When the internal temperature of the battery cell unit is too high, high-pressure gas can break open the explosion-proof plate 610 to relieve pressure.

[0090] In some embodiments, please refer to Figure 1 The stop frame 200 includes a first stop frame 210 located below the edge of the shell cover 100, a second stop frame 220 located below the explosion-proof structure 600 and the liquid injection structure 500, and a third stop frame 230 connected between the first stop frame 210 and the second stop frame 220. To ensure structural strength, the thickness of the first stop frame 210 and the second stop frame 220 can be the same or different, and the thickness of the first stop frame 210 and the second stop frame 220 is greater than the thickness of the third stop frame 230, so as to achieve the purpose of making room for the pole core as much as possible while ensuring that the stop frame 200 has sufficient strength, which is conducive to improving the energy density of the battery unit.

[0091] Figure 5 Schematic diagram of the structure of a built-in pole provided according to an embodiment of the present application is shown. In the embodiment of the present application, please refer to Figure 1 The built-in pole 700 includes a first pole connector 710, on which a first connection portion 711 is formed. The first connection portion 711 is configured to be connected to the second connection portion 311, and the first pole connector 710 can limit the pole core.

[0092] In an embodiment of the present application, the first pole connector 710 can be connected to the second connection portion 311 of the second pole connector 310 through the first connection portion 711, thereby realizing the connection between the built-in pole 700 and the external pole 300. The built-in pole 700 and the external pole 300 can form a complete pole. In the complete pole, the first pole connector 710 can limit the pole core, so that the built-in pole 700 can limit the pole core together with the stop frame 200. The stop frame 200 can be designed to be thinner, thereby releasing a larger installation space for the pole core. The pole core has a higher space occupancy in the shell, thereby being able to improve the energy density of the battery unit.

[0093] It is understandable that in order to improve the limiting effect of the built-in pole 700 on the pole core, the built-in pole 700 has certain requirements on the structural strength. To this end, the built-in pole 700 can adopt a solid structure.

[0094] In addition, after the internal pole 700 and the external pole 300 are connected together to form an integral pole, in order to ensure the structural strength of the pole, a strong connection method can be adopted between the internal pole 700 and the external pole 300.

[0095] For example, in some embodiments, the first connection portion 711 is configured to be embedded in the second connection portion 311 . When the built-in pole 700 can adopt a solid structure, after the first connection portion 711 is embedded in the second connection portion 311 , the pole has a higher structural strength.

[0096] In some embodiments, the first connection portion 711 is an external thread formed on the outer circumference of the first pole connector 710 .

[0097] Thus, the connection between the internal pole 700 and the external pole 300 can be achieved by threaded connection, and the connection strength is high and easy to assemble.

[0098] In some embodiments, please refer to Figure 5 The built-in pole 700 further includes a connecting piece 720 , which is connected to the first pole connector 710 .

[0099] Combined with the above, the function of the connecting piece 720 is to form an electrical connection between the pole and the pole ear. Here, the connecting piece 720 is integrated into the first pole connector 710 to make the cover plate 520 structure more compact, which is conducive to controlling the internal space of the battery cell unit, so that the space occupation of the pole core can be higher.

[0100] The connecting piece 720 can be connected to the first pole connector 710 by welding. After the built-in pole 700 is installed on the cover plate 520 structure, the connecting piece 720 in the built-in pole 700 can be welded to the pole ear, thereby simplifying the connection process of the connecting piece 720, and the connection between the connecting piece 720 and the pole ear can be achieved through only one welding process.

[0101] In some embodiments, please refer to Figure 5 The built-in pole 700 also includes a flexible connector 730, which is connected between the first pole connector 710 and the connecting piece 720. The flexible connector 730 has a certain elasticity and can provide sufficient buffering effect when the battery cell unit vibrates.

[0102] In some specific embodiments, the flexible connector 730 can be made of metal materials such as aluminum, copper, steel, and nickel.

[0103] The specific structure and size of the flexible connector 730 can be selected according to actual needs. The specific structure of the flexible connector 730 can be a square structure, a trapezoidal structure, etc. The size of the flexible connector 730 can be designed according to a certain proportion of the connecting piece 720.

[0104] As an example, the soft connector 730 can be connected to the center position of the connecting piece 720, and the flexible connector adopts a trapezoidal structure, which has a first connecting surface 731 and a second connecting surface 732, wherein the first connecting surface 731 is smaller and connected to the first pole connector 710, and the second connecting surface 732 is larger and connected to the connecting piece 720, and the surface of the connecting piece 720 connected to the second connecting surface 732 is the third connecting surface 721, and the area of ​​the projection of the first connecting surface 731 on the third connecting surface 721 can be S1, and the area of ​​the third connecting surface 721 can be S2, wherein S1 / S2=1 / 5~1 / 2.

[0105] In order to more clearly understand the main contents of the embodiments of the present application, the cover plate 520 structure in the embodiments of the present application will be described below by taking some of the above-mentioned embodiments as an example. In this part of the embodiments, the cover plate 520 structure includes a shell cover 100, a stop frame 200, a positive electrode column 10, a negative electrode column 20, a liquid injection structure 500 and an explosion-proof structure 600, etc.

[0106] Please refer to Figure 1The shell cover 100 is provided with a positive pole 10, an explosion-proof structure 600, a liquid injection structure 500 and a negative pole 20 in sequence. A stop frame 200 is also provided on the inner surface of the shell cover 100. The stop frame 200 is a hollow structure and its inner side is a grid. The stop frame 200 includes a first stop frame 210 located below the edge of the shell cover 100, a second stop frame 220 located below the explosion-proof structure 600 and the liquid injection structure 500, and a third stop frame 230 connected between the first stop frame 210 and the second stop frame 220. Both the positive pole 10 and the negative pole 20 adopt a split structure, that is, both the positive pole 10 and the negative pole 20 include an internal pole 700 and an external pole 300, and the internal pole 700 and the external pole 300 are connected by a threaded connection. For the built-in pole 700 , a connection piece 720 is integrated on the first pole connector 710 and a flexible connector 730 is provided.

[0107] In the above embodiment, for the positive electrode column 10 or the negative electrode column 20, because it adopts a split structure, the built-in electrode column 700 can limit the electrode core, and the built-in electrode column 700 adopts a more compact structural design, which can make room for the electrode core, which is beneficial to improve the energy density of the battery unit.

[0108] In the above embodiment, the stop frame 200 can form a limiting effect on the pole core by setting its thickness. For example, the thickness of the first stop frame 210 is greater than the thickness of the third stop frame 230. This can ensure that the stop frame 200 has sufficient strength while making as much space as possible for the pole core, which is beneficial to improving the energy density of the battery unit.

[0109] In summary, in the above embodiments, the cover plate 520 structure can reduce its share of the internal space of the battery cell unit on the basis of having sufficient strength, thereby increasing the space share of the pole core and thus increasing the energy density of the battery cell unit.

[0110] In the battery cell unit described in the present application, the positive electrode ear in the electrode core can be made of aluminum, and the negative electrode ear can be made of copper. To ensure uniform performance and reliability, for the positive electrode 10, its first electrode connector 710 can be made of aluminum (matching the positive electrode ear), and the second electrode connector 310 can be made of aluminum. In the embodiment using threaded connection, the built-in electrode 700 can be screwed into the external electrode 300; for the negative electrode 20, its first electrode connector 710 can be made of copper (matching the negative electrode ear), and the second electrode connector 310 can be made of aluminum. To ensure smooth transition of current to the second electrode connector 310, after the built-in electrode 700 is screwed into the external electrode 300, the two can be tightly connected by welding, which can avoid the problem of overcurrent obstruction caused by different melting points of different materials.

[0111] In the description of the present application, 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" and the like 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 application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0112] In the description of the present application, it should be understood that the terms "including" and "having" and any variations thereof used in the embodiments of the present application are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or apparatuses.

[0113] Unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense, for example, it can be a fixed connection, it can also be a detachable connection, or it can be integrated; it can be directly connected, or it can be indirectly connected through an intermediate medium, it can make the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances. In addition, the terms "first", "second", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated.

[0114] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A built-in pole, characterized in that: include: A first pole connector is provided with a first connection portion, the first connection portion is configured to be connected to the second connection portion, and the first pole connector can limit the pole core.

2. The built-in pole according to claim 1, characterized in that: The first connection portion is configured to be embeddable in the second connection portion.

3. The built-in pole according to claim 2, characterized in that: The first connection portion is an external thread formed on an outer circumference of the first pole connector.

4. The built-in pole according to any one of claims 1 to 3, characterized in that: The built-in pole also includes: A connecting piece, wherein the connecting piece is connected to the first pole connector.

5. The built-in pole according to claim 4, characterized in that: The built-in pole also includes: A flexible connector is connected between the first pole connector and the connecting piece.

6. A cover plate structure, characterized in that: include: Shell cover; A stop frame, arranged on one side of the shell cover; and an external pole connected to the shell cover, wherein the external pole includes a second pole connector, wherein the second pole connector is formed with a second connecting portion for connecting with the first connecting portion.

7. The cover plate structure according to claim 6, characterized in that: The second pole connector is formed with an inner cavity, and the first pole connector can be received in the inner cavity.

8. The cover plate structure according to claim 7, characterized in that: An internal thread is formed in the inner cavity.

9. The cover plate structure according to claim 6, characterized in that: The shell cover is formed with a mounting hole, the second pole connector is arranged at the mounting hole, and the cover plate structure further includes: A sealing insulating layer is disposed between the shell cover and the second pole connector and covers the periphery of the mounting hole.

10. The cover plate structure according to claim 9, characterized in that: The second pole connector is formed with a concave section, the concave section includes a first surface, a second surface and a third surface, the first surface is opposite to the outer surface of the shell cover, the second surface is opposite to the periphery of the mounting hole, and the third surface is opposite to the inner surface of the shell cover, and the sealing insulation layer includes: A first section is filled between the outer surface of the shell cover and the first surface; A second section is filled between the periphery and the second surface; and a third section filled between the inner surface and the third surface.

11. The cover plate structure according to claim 10, characterized in that: The periphery is further formed with a step on one side of the inner surface.

12. The cover plate structure according to claim 6, characterized in that: The stop frame is a hollow structure and the inner side surface of the stop frame is a grid shape.

13. A battery cell unit, characterized in that: The invention comprises a cover plate structure according to any one of claims 6 to 12.

Images