Battery cover plate assembly and assembling method thereof, battery monomer and battery module

Abstract

The application belongs to the technical field of energy storage devices, and discloses a battery cover plate assembly, an assembling method thereof, a battery monomer and a battery module. The battery cover plate assembly comprises a cover plate, a pole and an adapter piece, and the cover plate is provided with a first through hole. The pole is provided in a split structure, comprising a first pole part and a second pole part, the first pole part is provided with a second through hole which is in communication with the first through hole, and the second pole part penetrates the first through hole and the second through hole and is connected with the first pole part. The adapter piece is connected with the second pole part. The battery cover plate assembly can effectively improve the structural strength of the pole assembly, prevent the pole assembly from failing under the action of external temperature or pressure, and cause the battery to be scrapped. The assembling method can avoid the welding slag produced when the pole and the adapter piece are welded from splashing onto the cover plate, thereby avoiding the introduction of the welding slag into the battery monomer, and improving the safety performance of the battery monomer.

Description

Technical Field

[0001] This invention relates to the field of energy storage device technology, and in particular to battery cover plate assemblies and their assembly methods, battery cells, and battery modules. Background Technology

[0002] With technological advancements and the rapid development of new energy sources, batteries, as important energy storage devices, are finding increasingly wider applications, and safety requirements are also rising.

[0003] Prismatic batteries, as a type of new energy battery with high energy density, high safety, and good sealing, have attracted widespread attention. A typical prismatic battery includes a cell, a casing housing the cell, and a cover plate sealed to the casing. The cover plate houses the terminal post assembly, used to conduct current between the inside and outside of the battery. Because the terminal post assembly is partially located outside the battery, it is easily affected by the external environment. When exposed to high temperatures or high pressures, the terminal post assembly is easily damaged, tilting, breaking, or even detaching from the cover plate. This compromises the battery's sealing, rendering it unusable. Furthermore, it may cause electrolyte leakage, leading to safety issues.

[0004] Furthermore, although the manufacturing process of prismatic batteries has become increasingly mature, the following problems still exist:

[0005] 1. First, connect the electrode post and the cover plate. The sealing connection between the electrode post and the cover plate is achieved through injection molding. However, under high temperature and external pressure, the structure of the plastic part is easily damaged, the structural strength is reduced, the service life is affected, and it is easy to twist, causing the plastic part to deform.

[0006] 2. The connection between the terminal post and the cover plate is achieved through the terminal post, plastic parts, and external pressure block. However, the connection process requires a large amount of pressure, which can easily cause the plastic parts to break. On the one hand, the sealing performance of the battery cannot be guaranteed. On the other hand, it can easily cause the terminal post to come into contact with the cover plate, resulting in a short circuit.

[0007] 3. First, fix the terminal to the cover plate, and then weld the terminal and the adapter plate together. The welding slag produced when welding the terminal and the adapter plate can easily splash onto the cover plate. When the cover plate is assembled into the casing, the welding slag will be introduced into the battery, causing a huge safety hazard.

[0008] Therefore, there is an urgent need for battery cover plate assemblies and their assembly methods, battery cells, and battery modules to solve the above problems. Summary of the Invention

[0009] The first objective of this invention is to provide a battery cover assembly that can effectively enhance the structural strength of the terminal assembly and prevent the terminal assembly from deforming, breaking, or failing under the influence of external forces or high temperatures.

[0010] To achieve this objective, the present invention adopts the following technical solution:

[0011] Battery cover assembly, including:

[0012] A cover plate, wherein a first through hole is provided on the cover plate;

[0013] The pole is configured as a split structure, including a first pole part and a second pole part. The first pole part is provided with a second through hole that communicates with the first through hole. The second pole part passes through the first through hole and the second through hole and is connected to the first pole part.

[0014] An adapter plate is connected to the second pole piece, and the adapter plate and the first pole piece are located on opposite sides of the cover plate.

[0015] As an optional solution for the aforementioned battery cover assembly, the first electrode post is connected to the cover plate via an upper plastic bond.

[0016] As an optional solution for the aforementioned battery cover assembly, a first slot is provided on the outer peripheral surface of the first electrode post, and a corresponding protrusion is formed on the upper plastic, the protrusion engaging with the first slot.

[0017] As an optional solution for the aforementioned battery cover assembly, a flange is also provided on the outer peripheral surface of the first electrode post, and a second slot is correspondingly formed on the upper plastic, with the flange engaging with the second slot.

[0018] As an optional embodiment of the aforementioned battery cover assembly, a first limiting structure is provided on at least one side of the flange, and the first limiting structure is in contact with the upper plastic.

[0019] As an optional solution for the above-mentioned battery cover assembly, the cover includes a cover body and a limiting protrusion, the first through hole is disposed on the cover body, the limiting protrusion is disposed around the first through hole on the cover body, and the upper plastic is snapped onto the limiting protrusion.

[0020] As an optional embodiment of the aforementioned battery cover assembly, the limiting protrusion surrounds the first through hole; or,

[0021] The limiting protrusions are provided in multiple ways, and the multiple limiting protrusions are arranged at intervals around the first through hole.

[0022] As an optional embodiment of the aforementioned battery cover assembly, the limiting protrusion is inclined from one end connected to the cover towards the other end toward the first through hole.

[0023] As an optional embodiment of the aforementioned battery cover assembly, the battery cover assembly further includes:

[0024] A sealing element is sandwiched between the cover plate and the first pole post portion, and between the cover plate and the second pole post portion.

[0025] As an optional embodiment of the above-mentioned battery cover assembly, the sealing element is disposed in the first through hole, and the sealing element extends to the sides of the cover plate at both ends of the first through hole, and the extended sealing element fits against the two sides of the cover plate.

[0026] As an optional embodiment of the aforementioned battery cover assembly, the sealing element includes a first sealing element and a second sealing element. The first sealing element includes a first end clamped between the first terminal post and the cover plate, and a second end clamped between the second terminal post and the cover plate. The second sealing element includes a first end clamped between the adapter piece and the cover plate, and a second end clamped between the second terminal post and the cover plate.

[0027] As an alternative to the aforementioned battery cover assembly, the second end of the first seal abuts against the second end of the second seal.

[0028] The second objective of this invention is to provide an assembly method for a battery cover assembly, which avoids the welding slag generated during the welding of the terminal post and the adapter plate from splashing onto the cover plate by changing the assembly sequence of the battery cover assembly.

[0029] To achieve this objective, the present invention adopts the following technical solution:

[0030] A method for assembling a battery cover assembly, based on the battery cover assembly described above, includes the following steps:

[0031] S1. Connect the first pole post and the cover plate;

[0032] S2. Connect the second pole piece to the adapter piece as a whole;

[0033] S3. Insert the second pole post through the first through hole and into the second through hole, and connect the second pole post and the first pole post.

[0034] As an optional embodiment of the assembly method for the aforementioned battery cover assembly, an annular recessed platform structure is provided around the first through hole for placing the first electrode post. Before step S1, step S10 is included: placing the first electrode post into the recessed platform to achieve initial engagement between the first electrode post and the cover.

[0035] As an optional method for assembling the battery cover assembly, when the second pole portion and the first pole portion are connected, the second pole portion is axially compressed to cause the second pole portion to expand within the second through hole so as to rivet with the first pole portion.

[0036] The third objective of this invention is to provide a battery cell that improves operational safety.

[0037] To achieve this objective, the present invention adopts the following technical solution:

[0038] A battery cell includes a housing and a battery cell. The housing has an opening, and the battery cell is disposed inside the housing. The battery cell also includes a battery cover assembly as described above. The adapter piece is electrically connected to the battery cell, and the cover plate is disposed over the opening.

[0039] The fourth objective of this invention is to provide a battery module that improves operational safety.

[0040] To achieve this objective, the present invention adopts the following technical solution:

[0041] A battery module comprising multiple battery cells as described above, wherein the multiple battery cells are connected in series or in parallel.

[0042] Beneficial effects:

[0043] The battery cover assembly proposed in this invention features a split structure for the terminals, comprising a first terminal portion and a second terminal portion. Multiple snap-fit ​​structures are formed between the first terminal portion and the upper plastic layer using a first slot and a snap-fit ​​protrusion, along with limiting structures such as limiting protrusions between the upper plastic layer and the cover plate. This further strengthens the connection between the terminals and the upper plastic layer, preventing deformation or breakage of the upper plastic layer under external forces. Furthermore, a sealing structure that abuts against both the inner and outer sides of the cover plate further enhances the sealing performance of the battery cells, effectively preventing rapid deterioration of the sealing performance when the upper plastic layer breaks. Simultaneously, the sealing element also buffers damage to the terminals from external forces. Moreover, the split-type connection method, achieved through injection molding on the exterior of the casing, effectively solves the problem of easy deformation and breakage of injection-molded parts encountered in existing single-injection molding or assembly methods. This effectively improves the structural strength of the terminal assembly, preventing failure under external temperature or pressure and thus ensuring battery durability.

[0044] The battery cover assembly assembly method proposed in this invention involves first installing the first terminal post onto the cover plate, then connecting the second terminal post to the adapter plate, and finally inserting the second terminal post through the first through hole into the second through hole, connecting the second terminal post and the first terminal post. This effectively prevents weld slag generated during the welding of the terminal post and the adapter plate from splashing onto the cover plate, thereby preventing weld slag from being introduced into the battery cell and improving the safety performance of the battery cell.

[0045] The battery cell and battery module proposed in this invention improve safety during operation by adopting the aforementioned battery cover assembly. Attached Figure Description

[0046] Figure 1 This is a three-dimensional structural diagram of a battery cell provided in Embodiment 1 of the present invention;

[0047] Figure 2 This is a schematic diagram of the disassembled structure of a battery cell provided in Embodiment 1 of the present invention;

[0048] Figure 3 This is a cross-sectional structural diagram of a battery cell provided in Embodiment 1 of the present invention;

[0049] Figure 4 yes Figure 3 Enlarged structural diagram at point A;

[0050] Figure 5 This is a schematic diagram of the pole structure provided in Embodiment 1 of the present invention;

[0051] Figure 6 This is a schematic diagram of the disassembled structure of the pole provided in Embodiment 1 of the present invention;

[0052] Figure 7 This is a partial structural schematic diagram of the cover plate provided in Embodiment 1 of the present invention;

[0053] Figure 8 This is a flowchart of the assembly method of the battery cover assembly provided in Embodiment 2 of the present invention;

[0054] Figure 9 This is a flowchart of the battery cell assembly method provided in Embodiment 2 of the present invention.

[0055] In the picture:

[0056] 1. Cover plate; 11. Cover plate body; 111. First through hole; 112. Groove; 113. Second limiting structure; 12. Limiting protrusion;

[0057] 2. Pole post; 21. First pole post portion; 211. Second through hole; 212. First slot; 213. Flange; 2131. First limiting structure; 22. Second pole post portion;

[0058] 3. Adapter plate;

[0059] 4. Apply plastic; 41. Embossing;

[0060] 5. Sealing components;

[0061] 6. Lower plastic;

[0062] 7. Shell;

[0063] 8. Battery cell; 81. Electrode tab. Detailed Implementation

[0064] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0065] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0066] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0067] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0068] Example 1

[0069] like Figure 1 and Figure 2 As shown, this embodiment provides a battery cell, which includes a housing 7, a battery cell 8, and a battery cover assembly. One end of the housing 7 is provided with an opening, through which the battery cell 8 is placed into the housing 7. The battery cover assembly is placed on the opening to seal the housing 7. The battery cell 8 inside the housing 7 is electrically connected to the outside through the terminal post 2.

[0070] like Figure 1 and Figure 2 As shown, the battery cover assembly includes a cover plate 1 and a terminal post 2. The cover plate 1 has a first through hole 111. The terminal post 2 passes through the first through hole 111, extends out of the cover plate 1, and is sealed to the cover plate 1. The terminal post 2 has functions such as conductivity, sealing, and impact resistance, and is an important component of the battery cell.

[0071] Terminal 2 includes a positive terminal and a negative terminal. The structure and fixing method of the positive terminal and the negative terminal are basically the same. Here, the positive terminal and the negative terminal are not specifically distinguished and are collectively referred to as terminal 2.

[0072] Because the terminal assembly is located outside the battery, it is easily affected by the external environment. When the external environment is high temperature or high pressure, the terminal assembly is easily damaged, tilting, breaking, or even detaching from the cover plate 1. This can compromise the sealing of the battery cell, rendering it unusable. Furthermore, it may cause electrolyte leakage, leading to safety issues. It is understood that the terminal assembly here includes the terminal 2 and the upper plastic 4.

[0073] To solve the above problems, such as Figures 2-6 As shown, this embodiment provides a battery cover assembly that improves the structure of the terminal post 2. Specifically, the terminal post 2 is configured as a split structure, including a first terminal post portion 21 and a second terminal post portion 22. The first terminal post portion 21 is provided with a second through hole 211 that communicates with the first through hole 111. The second terminal post portion 22 passes through the first through hole 111 and the second through hole 211 and is connected to the first terminal post portion 21. An adapter piece 3 is connected to the second terminal post portion 22, and the adapter piece 3 and the first terminal post portion 21 are respectively located on both sides of the cover plate 1. Preferably, the first terminal post portion 21 is sealed and insulated from the cover plate 1.

[0074] By configuring the terminal post 2 as a split structure comprising a first terminal post portion 21 and a second terminal post portion 22, during the assembly of the battery cover assembly, the first terminal post portion 21 is first connected to the cover plate 1, the second terminal post portion 22 is welded to the adapter piece 3, and then the second terminal post portion 22 is connected to the first terminal post portion 21 through the first through hole 111 and the second through hole 211. During the welding process between the second terminal post portion 22 and the adapter piece 3, it can be kept away from the cover plate 1, avoiding the splashing of welding slag onto the cover plate 1, thereby preventing the introduction of welding slag into the battery cell and improving the safety performance of the battery cell.

[0075] Specifically, such as Figure 4 As shown, the first electrode post 21 is connected to the cover plate 1 via an upper plastic 4. The upper plastic 4 is preferably injection molded integrally with the first electrode post 21 and the cover plate 1. During injection molding, the cover plate 1 and the first electrode post 21 are integrally molded with the upper plastic 4 as inserts, making the processing of the upper plastic 4 more convenient and facilitating a tight and secure connection between the upper plastic 4 and the cover plate 1, and between the upper plastic 4 and the first electrode post 21. This better ensures the good sealing and insulation properties of the upper plastic 4 between the cover plate 1 and the first electrode post 21. Simultaneously, the upper plastic 4 also serves to fix the first electrode post 21, ensuring stable operation of the electrode post 2.

[0076] In some embodiments, a recessed platform is provided on the periphery of the first through hole 111 on the cover plate 1. The recessed platform has an annular structure, and the inner diameter of the recessed platform is limited to accommodate the first pole post 21.

[0077] Furthermore, such as Figure 5 and Figure 6 As shown, the first through hole 111 and the first pole post 21 are respectively set as circles, and the second through hole 211 on the first pole post 21 is also set as a circle, and the second through hole 211 is set at the center of the first pole post 21. The second pole post 22 is set as a cylinder so as to be inserted into the second through hole 211.

[0078] like Figures 4-6 As shown, to make the connection between the first electrode post 21 and the upper plastic 4 more secure, a first slot 212 is provided on the outer peripheral surface of the first electrode post 21, and a corresponding protrusion 41 is formed on the upper plastic 4, which engages with the first slot 212. By engaging the protrusion 41 with the first slot 212, the axial movement of the first electrode post 21 is restricted, thereby helping to prevent the upper plastic 4 from detaching from the first electrode post 21.

[0079] Furthermore, such as Figure 4 and Figure 5As shown, a flange 213 is also provided on the outer peripheral surface of the first electrode post 21, and a second groove is correspondingly formed on the upper plastic 4. The flange 213 engages with the second groove. By providing the flange 213, the contact area between the first electrode post 21 and the upper plastic 4 is increased, thereby making the connection between the upper plastic 4 and the first electrode post 21 more secure.

[0080] like Figure 5 As shown, in order to further increase the contact area between the first pole post 21 and the upper plastic 4, a first limiting structure 2131 is provided protrudingly or recessed on at least one side of the flange 213, and the first limiting structure 2131 is in contact with the upper plastic 4. Figure 5 As shown, the first limiting structure 2131 consists of multiple toothed grooves on the lower side of the flange 213. These grooves are arranged circumferentially to form a ring. During injection molding of the upper plastic 4, the plastic material flows into the grooves to form a locking block, which engages with the grooves to secure the connection, thus improving the strength of the connection between the first pole post 21 and the upper plastic 4. Alternatively, the grooves can be located on the upper side of the flange 213, or grooves can be provided on both the upper and lower sides of the flange 213.

[0081] In other embodiments, protrusions may be provided on one or both sides of the flange 213. The protrusions surround the flange 213 and are inserted into the upper plastic 4. This can also increase the contact area between the first pole post 21 and the upper plastic 4, making the connection between the upper plastic 4 and the first pole post 21 more secure.

[0082] In some preferred embodiments, a flange and a slot structure are provided on the first pole post 21, which can further enhance the strength of the pole post assembly composed of the upper plastic 4 and the pole post 2, so that it can withstand greater external forces without deformation or breakage.

[0083] Furthermore, combined Figure 4 and Figure 7 As shown, the cover plate 1 includes a cover plate body 11 and a limiting protrusion 12. A first through hole 111 is provided on the cover plate body 11. The limiting protrusion 12 is provided around the first through hole 111 on the cover plate body 11. The upper plastic 4 is snapped onto the limiting protrusion 12 so that the upper plastic 4 is more firmly connected to the cover plate 1.

[0084] Optionally, a second limiting structure 113 is provided around the limiting protrusion 12 on the cover plate body 11. The second limiting structure 113 can increase the contact area between the cover plate body 11 and the upper plastic 4, thereby improving the connection stability between the cover plate body 11 and the upper plastic 4. Specifically, the second limiting structure 113 can be multiple micro-holes or micro-protrusions provided on the cover plate body 11. The provision of micro-holes or micro-protrusions can achieve the purpose of increasing the contact area between the cover plate body 11 and the upper plastic 4.

[0085] Optionally, the limiting protrusion 12 is inclined from one end connected to the cover plate 1 towards the other end toward the first through hole 111. This causes the limiting protrusion 12 to provide a resisting force against the upper plastic 4 toward the cover plate 1, thereby restricting the upper plastic 4 from detaching from the cover plate 1 and achieving the effect of restricting the axial movement of the upper plastic 4.

[0086] Optionally, in some embodiments, the limiting protrusion 12 is S-shaped from one end connected to the cover plate body 11 to the other end, so that the contact surface between the upper plastic 4 and the limiting protrusion 12 is a stepped surface, which further improves the snap-fit ​​firmness between the upper plastic 4 and the limiting protrusion 12.

[0087] Specifically, such as Figure 7 As shown, the limiting protrusion 12 can be configured to surround the first through hole 111, and the limiting protrusion 12 is annular. Alternatively, multiple limiting protrusions 12 can be configured, with multiple limiting protrusions 12 arranged at intervals around the first through hole 111, to jointly provide a retaining force to the upper plastic 4.

[0088] When multiple limiting protrusions 12 are discretely provided, after the upper plastic 4, cover plate 1, and first pole post 21 are integrally injection molded, the limiting protrusions 12 are independently inserted into the upper plastic 4, which improves the firmness of the connection between the cover plate body 11 and the upper plastic 4, effectively prevents the upper plastic 4 from rotating relative to the cover plate body 11, thereby improving the anti-rotation performance of the first pole post 21 and improving the working stability of the pole post 2.

[0089] Specifically, 4-12 limiting protrusions 12 can be provided, and the 4-12 limiting protrusions 12 are evenly spaced along the circumference of the through hole. In this embodiment, there is no limit to the specific number of limiting protrusions 12. The appropriate number of limiting protrusions 12 is set according to the actual situation such as the size of the through hole and the structure of the upper plastic 4. The number of limiting protrusions 12 needs to be set to ensure that the upper plastic 4 does not rotate relative to the cover plate 1; in addition, if the number of limiting protrusions 12 is too large, it means that the number of first slots 212 that need to be set on the upper plastic 4 will increase, which may damage the structural strength of the upper plastic 4. Therefore, the upper plastic 4 also needs to maintain sufficient structural strength.

[0090] Optionally, the end of the limiting protrusion 12 connected to the cover plate body 11 is kept at a preset distance from the first through hole 111 so that a limiting space is formed between the limiting protrusion 12 and the cover plate body 11. When the upper plastic 4 is integrally injection molded with the cover plate 1 and the first pole post 21, the upper plastic 4 is formed in the limiting space to form a snap-fit ​​block that snaps into the limiting protrusion 12. This is beneficial to the injection molding of the upper plastic 4 and at the same time improves the snap-fit ​​firmness between the upper plastic 4 and the limiting protrusion 12.

[0091] Furthermore, such as Figure 4As shown, the first pole post 21 is located above the outer side of the cover plate body 11. The upper plastic 4 is injection molded and filled between the first pole post 21 and the cover plate 1, which can make the connection between the first pole post 21, the upper plastic 4 and the cover plate 1 stronger.

[0092] Optionally, such as Figure 4 As shown, the battery cover assembly also includes a sealing element 5, which is sandwiched between the cover plate 1 and the first terminal post 21, and between the cover plate 1 and the second terminal post 22, to ensure the insulation and sealing between the terminal post 2 and the cover plate body 11. The sealing element 5 can specifically be a sealing ring.

[0093] Specifically, such as Figure 4 As shown, the sealing element 5 is disposed in the first through hole 111, and the sealing element 5 extends to the side of the cover plate 1 at both ends of the first through hole 111. The extended sealing element 5 fits against the two sides of the cover plate 1, that is to say, the cross section of the sealing element 5 is I-shaped, covering the hole wall of the first through hole 111 and fitting against the inner and outer sides of the cover plate body 11, which can play a good sealing and insulation role.

[0094] In one embodiment, the sealing element 5 includes a first sealing element and a second sealing element. The first sealing element includes a first end clamped between the first pole portion 21 and the cover plate 1 and a second end clamped between the second pole portion 22 and the cover plate 1. The second sealing element includes a first end clamped between the adapter piece 3 and the cover plate 1 and a second end clamped between the second pole portion 22 and the cover plate 1.

[0095] In a preferred embodiment, the second end of the first seal abuts against the second end of the second seal.

[0096] Furthermore, such as Figure 4 As shown, a groove 112 is provided on the inner side of the portion of the cover plate body 11 surrounding the first through hole 111. The groove 112 can free up some space inside the battery cell, thereby improving the utilization rate of the internal space of the battery cell and increasing the energy density of the battery cell.

[0097] Specifically, the groove 112 can be formed by stamping, which is relatively convenient to process.

[0098] Example 2

[0099] In the prior art, when assembling a battery cell, the terminal post 2 is first fixedly connected to the cover plate 1, and then the terminal post 2 and the adapter plate 3 are welded together. The welding slag generated when the terminal post 2 and the adapter plate 3 are welded can easily splash onto the cover plate 1. When the cover plate 1 is assembled into the housing 7, the welding slag will be introduced into the battery cell, causing a huge safety hazard.

[0100] To solve the above problems, such as Figure 8As shown, this embodiment provides an assembly method for a battery cover assembly. Based on the battery cover assembly provided in Embodiment 1, the assembly method for the battery cover assembly includes the following steps:

[0101] S1: Install the first pole post 21 onto the cover plate 1.

[0102] Specifically, when the first pole post 21 is installed on the cover plate 1, the sealing element 5 is sandwiched between the first pole post 21 and the cover plate 1. First, the relative positions of the first pole post 21, the cover plate 1 and the sealing element 5 are fixed. Then, the upper plastic 4 is injected at the connection between the first pole post 21, the cover plate 1 and the sealing element 5 by injection molding, thereby fixing the first pole post 21 to the cover plate 1.

[0103] In some embodiments, an annular recess is provided on the cover plate 1 around the first through hole 111, and the recess is used to place the first pole post 21. Before step S1, step S10 is also included: placing the first pole post 21 into the recess to achieve initial engagement between the first pole post 21 and the cover plate 1.

[0104] S2: Connect the second pole post 22 and the adapter piece 3 into one unit.

[0105] Specifically, the second pole post 22 is connected to the adapter piece 3 by welding. During welding, it is kept away from the cover plate 1 to prevent welding slag from splashing onto the cover plate 1.

[0106] S3: The second pole post 22 is inserted through the first through hole 111 and into the second through hole 211, and the second pole post 22 and the first pole post 21 are connected.

[0107] Specifically, when the second pole post 22 and the first pole post 21 are connected, the second pole post 22 is axially compressed, causing the second pole post 22 to expand within the second through hole 211 so as to rivet with the first pole post 21.

[0108] Optionally, after the second pole post 22 and the first pole post 21 are riveted together, the second pole post 22 and the first pole post 21 can be welded to make the connection between the second pole post 22 and the first pole post 21 more stable, avoid relative rotation or relative axial movement between the second pole post 22 and the first pole post 21, thereby ensuring the stable operation of the pole post 2.

[0109] It should be noted that the order of steps S1 and S2 is not restricted. Alternatively, the second pole piece 22 can be connected to the adapter piece 3 first, then the first pole piece 21 can be installed on the cover plate 1, and finally the second pole piece 22 and the first pole piece 21 can be connected. Alternatively, steps S1 and S2 can be performed simultaneously to prepare for step S3.

[0110] Example 3

[0111] like Figure 9 As shown, this embodiment provides a method for assembling a single battery cell, including the following steps:

[0112] S1: First, assemble the battery cover assembly using the assembly method for the battery cover assembly provided in Example 2;

[0113] S2: Weld the adapter piece 3 to the tab 81 of the battery cell 8;

[0114] S3: Cover the opening of the housing 7 with the cover plate 1, and weld the cover plate 1 and the housing 7 together.

[0115] Example 4

[0116] This embodiment provides a battery module, which includes multiple battery cells as provided in Embodiment 1. The multiple battery cells are connected in series or in parallel to form a battery module.

[0117] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A battery cover assembly, characterized in that, include: Cover plate (1), the cover plate (1) is provided with a first through hole (111); The pole post (2) is configured as a split structure, including a first pole post part (21) and a second pole post part (22). The first pole post part (21) is provided with a second through hole (211) that communicates with the first through hole (111). The second pole post part (22) passes through the first through hole (111) and the second through hole (211) and is connected to the first pole post part (21). The adapter piece (3) is welded to the second pole post (22), and the adapter piece (3) and the first pole post (21) are located on both sides of the cover plate (1); The second pole post (22) is riveted to the first pole post (21); The first pole post (21) is connected to the cover plate (1) by an upper plastic (4); A first slot (212) is provided on the outer peripheral surface of the first pole post (21), and a corresponding protrusion (41) is formed on the upper plastic (4), and the protrusion (41) is engaged with the first slot (212); A flange (213) is also provided on the outer peripheral surface of the first pole post (21), and a second slot is correspondingly formed on the upper plastic (4), and the flange (213) is engaged with the second slot; A first limiting structure (2131) is provided on at least one side surface of the flange (213), and the first limiting structure (2131) is in contact with the upper plastic (4); The cover plate (1) includes a cover plate body (11) and a limiting protrusion (12). The first through hole (111) is disposed on the cover plate body (11), and the limiting protrusion (12) is disposed around the first through hole (111) on the cover plate body (11). The upper plastic (4) is snapped onto the limiting protrusion (12).

2. The battery cover assembly according to claim 1, characterized in that, The limiting protrusion (12) surrounds the first through hole (111) for one circumference; or, Multiple limiting protrusions (12) are provided, and the multiple limiting protrusions (12) are arranged at intervals around the first through hole (111).

3. The battery cover assembly according to claim 1, characterized in that, The battery cover assembly also includes: A sealing element (5) is sandwiched between the cover plate (1) and the first pole post (21), and between the cover plate (1) and the second pole post (22).

4. The battery cover assembly according to claim 3, characterized in that, The sealing element (5) is disposed in the first through hole (111), and the sealing element (5) extends to the side of the cover plate (1) at both ends of the first through hole (111), and the extended sealing element (5) fits against the two sides of the cover plate (1).

5. A method for assembling a battery cover assembly, characterized in that, Based on the battery cover assembly as described in any one of claims 1-4, the assembly method of the battery cover assembly includes the following steps: S1. Connect the first pole post (21) and the cover plate (1); S2. Connect the second pole post (22) and the adapter plate (3) into one unit; S3. The second pole post (22) is inserted into the second through hole (211) through the first through hole (111), and the second pole post (22) and the first pole post (21) are connected.

6. The assembly method of the battery cover assembly according to claim 5, characterized in that, When the second pole post (22) and the first pole post (21) are connected, the second pole post (22) is axially compressed, causing the second pole post (22) to expand in the second through hole (211) so as to rivet with the first pole post (21).

7. A battery cell, comprising a housing (7) and a battery cell (8), wherein the housing (7) has an opening, and the battery cell (8) is disposed within the housing (7), characterized in that, The battery cell further includes a battery cover assembly as described in any one of claims 1-4, wherein the adapter piece (3) is electrically connected to the battery cell (8), and the cover plate (1) is disposed over the opening.

8. A battery module, characterized in that, The battery module includes a plurality of battery cells as described in claim 7, wherein the plurality of battery cells are connected in series or in parallel.

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