Battery cell and battery pack

Abstract

The application discloses a battery monomer and a battery pack. The battery monomer comprises a shell, a top cover and a pole; the shell has an opening and a receiving cavity, and the opening and the receiving cavity are communicated; the top cover is connected to the shell and closes the opening; the pole is arranged in the top cover, and the pole has a first end face away from the shell; the first end face is provided with a conductive part and a first identification part at intervals; and the roughness of the first identification part is greater than that of the conductive part. The battery monomer is provided with the conductive part and the first identification part with different roughness on the surface of the pole, so that the accuracy of welding positioning is remarkably improved, and the positioning deviation problem caused by the uniformity of surface reflection in traditional welding is effectively solved. The high-precision welding positioning can reduce welding deviation or virtual welding phenomenon, ensure the electrical connection stability between the pole and the bus bar, reduce the contact resistance, and thus improve the conductive performance and thermal management efficiency of the battery module.

Description

Technical Field

[0001] This application belongs to the field of battery technology, specifically relating to a battery cell and a battery pack. Background Technology

[0002] Battery packs are typically assembled from multiple individual battery cells into modules, achieving efficient power transfer through electrical connectors such as busbars. During the assembly of individual battery cells, the terminals, as key components for electrical connection, usually require precise welding to the busbars. However, current technology struggles to accurately identify the welding areas on the terminal surface. This insufficient accuracy can lead to welding misalignment or incomplete soldering, consequently affecting the stability of the electrical connection and the overall reliability of the battery module. Utility Model Content

[0003] This application aims to provide a battery cell and a battery pack that at least solves one of the problems of the difficulty in identifying the welding area on the terminal post of the battery cell.

[0004] To solve the above-mentioned technical problems, this application is implemented as follows:

[0005] In a first aspect, embodiments of this application propose a battery cell, which includes a housing, a top cover, and a terminal post; the housing has an opening and a receiving cavity, the opening and the receiving cavity being in communication; the top cover is connected to the housing and closes the opening; the terminal post passes through the top cover, and the terminal post has a first end face facing away from the housing, the first end face having a conductive portion and a first identification portion spaced apart, the roughness of the first identification portion being greater than the roughness of the conductive portion.

[0006] Optionally, the electrode post includes a conductive block and a conductive post. The conductive post passes through the top cover, the conductive block is connected to the end of the conductive post away from the housing, and the end of the conductive post away from the housing passes through the conductive block. The conductive block is provided with a first part, which is spaced apart from the conductive part. The conductive post is provided with a second part, and the first part and the second part are connected to form the first identification part.

[0007] Optionally, the conductive post is further provided with a second identification part, the second part being arranged around the second identification part.

[0008] Optionally, the second portion and the second identification portion are spaced apart along the radial direction of the conductive post.

[0009] Optionally, the second identification part is a groove formed on the conductive post.

[0010] Optionally, the first identification part is at least one of a frosted surface, an uneven surface, or a surface formed by melting and then solidifying metal.

[0011] Optionally, the conductive part is made of a conductive material, and the conductive part and the first identification part are made of the same material or different materials.

[0012] Optionally, the first end face has a recess, the first identification part is located on the bottom wall of the recess, and the first identification part does not extend beyond the top of the recess.

[0013] Optionally, the battery cell further includes a protective component that covers the first identification portion.

[0014] Secondly, embodiments of this application propose a battery pack, which includes a busbar and a plurality of battery cells as described above, wherein the busbar connects the conductive portions of two adjacent battery cells.

[0015] In the battery cell embodiments of this application, the roughness of the first identification part is greater than that of the conductive part. That is, by providing conductive parts and the first identification part with different roughnesses on the electrode surface, the accuracy of welding positioning is significantly improved, effectively solving the positioning deviation problem caused by the uniformity of surface reflection in traditional welding. High-precision welding positioning reduces welding misalignment or incomplete welds, ensures the stability of the electrical connection between the electrode and the busbar, reduces contact resistance, and thus improves the conductivity of the battery module. This improvement in welding accuracy directly reduces localized overheating or uneven current caused by welding defects, significantly enhancing the operational stability and safety of the battery module.

[0016] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0017] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0018] Figure 1 This is a schematic diagram of the structure of a battery cell according to an embodiment of the present utility model;

[0019] Figure 2 This is a schematic diagram of the connection between the top cover and the pole post according to an embodiment of the present utility model;

[0020] Figure 3 This is a structural schematic diagram of the exploded view of the shell and top cover according to an embodiment of the present utility model;

[0021] Figure 4 This is a schematic diagram of the structure of a battery cell top view according to an embodiment of the present utility model;

[0022] Figure 5This is a structural schematic diagram of the top cover and pole according to an embodiment of the present utility model;

[0023] Figure 6 This is a schematic diagram of the pole piece in three-dimensional form according to an embodiment of the present utility model. Figure 1 ;

[0024] Figure 7 This is a schematic diagram of the structure of the conductive column according to an embodiment of the present utility model;

[0025] Figure 8 This is a schematic diagram of the structure of the conductive block according to an embodiment of the present utility model;

[0026] Figure 9 This is a schematic diagram of the pole piece in three-dimensional form according to an embodiment of the present utility model. Figure 2 ;

[0027] Figure 10 This is a schematic diagram of the structure of a battery cell according to an embodiment of the present utility model.

[0028] 10. Shell; 11. Receiving cavity; 12. Opening;

[0029] 20. Top cover;

[0030] 30. Terminal post; 31. First end face; 32. Conductive part; 33. First identification part; 331. First portion; 332. Second portion; 34. Conductive block; 35. Conductive post; 36. Second identification part; 37. Recess;

[0031] 40. Battery cells;

[0032] 50. Insulating film;

[0033] X, first direction; Y, second direction; Z, third direction. Detailed Implementation

[0034] The embodiments of this utility model will now be described in detail. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model. All other embodiments obtained by those skilled in the art based on the embodiments in this application without inventive effort are within the scope of protection of this application.

[0035] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly include one or more of the features. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0036] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0037] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0038] In the assembly process of battery modules, the welding process between the battery cell's terminals and the busbar is a crucial step in ensuring the reliability of the electrical connection, and the welding accuracy directly affects the performance and safety of the battery pack. The surface of the battery cell's terminals has conductive and identification parts. The conductive part serves as the welding area for welding to the busbar, while the identification part is used for positioning and marking. In current technology, the conductive and identification parts often use the same surface treatment process, resulting in a lack of significant difference in light reflectivity or texture features. This makes it difficult to accurately identify the welding area position using identification devices such as CCD vision systems (CCD vision systems are high-tech inspection devices based on industrial computers that convert optical images into electrical signals and perform digital processing to classify and locate target objects. The structure and operation of CCD vision systems are known to those skilled in the art and will not be described in detail here). This insufficient identification accuracy can lead to welding misalignment or incomplete welds, thereby affecting the stability of the electrical connection and the overall reliability of the battery module. Furthermore, current technology lacks structural optimization design for the welding area, making it difficult to achieve high-precision, high-consistency welding results under complex operating conditions and adapt to the increasing complexity and miniaturization of battery modules.

[0039] The following is combined Figure 1 - Figure 8 The battery cell and battery pack according to embodiments of the present invention are described, which can solve the above-mentioned technical problems. The battery cell and battery pack each have mutually perpendicular first directions Z, second directions X, and third directions Y. For example... Figure 1 As shown, when the battery cell has a relatively regular cuboid structure, the first direction Z is the height direction of the battery cell, the second direction X is the length direction of the battery cell, and the third direction Y is the thickness direction of the battery cell.

[0040] like Figure 2 As shown, according to some embodiments of this application, the battery cell includes a housing 10, a top cover 20, and terminals 30; as Figure 3 As shown, the housing 10 has an opening 12 and a receiving cavity 11, which communicate with each other; the top cover 20 is connected to the housing 10 and closes the opening 12. Specifically, Figure 3 A schematic diagram of the housing 10 with a receiving cavity 11 and an opening 12 is shown. The receiving cavity 11 has an opening 12 at one end along the first direction Z. During the assembly process of the battery cell, the battery cell 40 and other components inside the battery cell are assembled into the receiving cavity 11 through the opening 12, and the opening 12 is sealed by the top cover 20, so that the receiving cavity 11 forms a closed chamber.

[0041] The pole post 30 is inserted into the top cover 20, such as Figure 4As shown, the electrode post 30 has a first end face 31 facing away from the housing 10. The first end face 31 has conductive portions 32 and first identification portions 33 spaced apart. The roughness of the first identification portion 33 is greater than that of the conductive portion 32. In this embodiment, the conductive portion 32 is used for welding to the busbar, and the first identification portion 33 is used for positioning and identification. The first identification portion 33 is a solder mark, which can clearly distinguish the conductive portion 32 and the first identification portion 33 as being spaced apart.

[0042] According to the battery cell of this embodiment, the roughness of the first identification part 33 is greater than that of the conductive part 32. That is, by providing conductive parts 32 and the first identification part 33 with different roughnesses on the surface of the electrode post 30, the accuracy of welding positioning is significantly improved, effectively solving the positioning deviation problem caused by the uniformity of surface reflection in traditional welding. High-precision welding positioning can reduce welding offset or incomplete welding, ensuring the electrical connection stability between the electrode post 30 and the busbar, reducing contact resistance, and thus improving the conductivity and thermal management efficiency of the battery module. This improvement in welding accuracy directly reduces local overheating or uneven current caused by welding defects, significantly enhancing the operational stability and safety of the battery module.

[0043] Furthermore, such as Figure 4 As shown, two terminals 30 are provided on the battery cell. The two terminals 30 are spaced apart along the second direction X. One of the two terminals 30 is the positive terminal and the other is the negative terminal. The two terminals 30 each have a first end face 31, and the first end face 31 is provided with a conductive part 32 and a first identification part 33 respectively.

[0044] Optionally, such as Figure 5 As shown, the electrode post 30 includes a conductive block 34 and a conductive post 35. The conductive post 35 passes through the top cover 20, and the conductive block 34 is connected to the end of the conductive post 35 away from the housing 10. The end of the conductive post 35 away from the housing 10 passes through the conductive block 34. Figure 6 As shown, the conductive block 34 is provided with a first portion 331 and a conductive part 32, which are spaced apart. The conductive post 35 is provided with a second portion 332. The first portion 331 and the second portion 332 are connected to form a first identification part, that is, the first identification part 33 includes the connected first portion 331 and the second portion 332. The first identification part 33 is a solder mark formed after the conductive block 34 and the conductive post 35 are welded together.

[0045] In this embodiment, the conductive post 35 passes through the center of the conductive block 34. The second part 332 of the first identification part 33 is disposed on the conductive post 35, which can accurately identify the center of the entire pole post 30. The first part 331 of the first identification part 33 is disposed on the conductive block, which can increase the area of ​​the first identification part 33 and improve the efficiency and accuracy of identification.

[0046] Optionally, such as Figure 7 As shown, a second identification part 36 is also provided on the conductive post 35, and a second part 332 is arranged around the second identification part 36. In this embodiment of the application, the accuracy of identification can be further improved by setting two identification parts, the first identification part 33 and the second identification part 36.

[0047] Furthermore, such as Figure 7 As shown, along the radial direction of the conductive post 35, the second part 332 and the second identification part 36 are spaced apart and connected relative to each other. There is a spaced area between the second part 332 and the second identification part 36 that is different from the second part 332 and the second identification part 36, which can reduce the identification difficulty and improve the identification efficiency of the second part 332 and the second identification part 36.

[0048] Furthermore, such as Figure 7 As shown, the second identification part 36 is a groove formed on the conductive post 35. At this time, the second part 332 is a solder mark, and the second identification part 36 is a groove. The second part 332 and the second identification part 36 are two different types of identification parts, which can improve the error tolerance of identification.

[0049] Understandably, the shape of the groove can be set according to usage requirements. For example, perpendicular to the first direction Z, the cross-section of the groove can be one or a combination of at least two of the following: circular, square, triangular, and elliptical. The bottom of the groove can be a plane or a conical surface.

[0050] Furthermore, the first identification part 33 is at least one of a frosted surface, an uneven surface, or a surface formed by melting and then solidifying metal. The first identification part 33 can be of various types to meet different identification needs, thereby improving the accuracy of identification.

[0051] A matte finish is a process that uses mechanical or chemical treatment to create a rough texture on the surface of an object. Its characteristics include diffuse light reflection, coverage of scratches, and improved durability. An uneven surface is one with depressions and protrusions, causing parallel incident light to be reflected in different directions, resulting in diffuse reflection. A surface formed by melting and then solidifying metal is another example, such as solder marks. Matte finishes, uneven surfaces, and surfaces formed by melting and then solidifying metal all have a high degree of roughness and are easily identifiable.

[0052] Optionally, the conductive part 32 is made of a conductive material, and the conductive part 32 and the first identification part 33 may be made of the same material or different materials. In this way, the first identification part 33 can have multiple material options to meet the various material requirements of the battery cell.

[0053] Where the conductive part 32 and the first identification part 33 are made of the same material, the first identification part 33 is also made of a conductive material. The fact that the conductive part 32 and the first identification part 33 are made of the same material gives the electrode post 30 the advantage of a simple structure. When the conductive part 32 and the first identification part 33 are made of different materials, the first identification part 33 can be made of adhesive, insulating material, or other materials. The first identification part 33 is disposed on the first end face 31 of the electrode post 30 by welding, pasting, or other methods.

[0054] Furthermore, the conductive part 32 is one or a combination of two or three of aluminum alloy, copper alloy, and stainless steel. The material of the conductive part 32 can be selected according to the application requirements, and it needs to meet the welding requirements and have good conductivity.

[0055] Optionally, such as Figure 9 As shown, a recess 37 is provided on the first end face 31, and the first identification part 33 is located on the bottom wall of the recess 37.

[0056] In this embodiment, since the roughness of the first identification part 33 is relatively large, the first identification part 33 is disposed in the recess 37 and does not extend beyond the top of the recess 37. This can prevent the roughness of the first identification part 33 from rubbing against other battery cells during the transfer of battery cells, causing damage to the appearance of other battery cells or cracking of the outer film, and thus causing poor appearance or quality.

[0057] Furthermore, the battery cell also includes a protective component that covers the first identification portion 33. In this embodiment, since the first identification portion 33 has a relatively large roughness, the protective component covers the first identification portion 33 to shield it, thus preventing the rough first identification portion 33 from rubbing against other battery cells during battery cell transport, which could cause damage to the appearance or breakage of the outer film, and thus lead to poor appearance or quality.

[0058] Furthermore, the protective component is made of adhesive, that is, adhesive is used to cover the first identification part 33. Covering the first identification part 33 with adhesive has the advantage of simple operation. Moreover, since the first identification part 33 has a large roughness, covering the first identification part 33 with adhesive also has the advantages of a large connection area and a firm connection, avoiding the separation of the adhesive and the first identification part 33, which would cause the roughness of the first identification part 33 to rub against other battery cells during the transfer process.

[0059] Optionally, such as Figure 10 As shown, the battery cell also includes a cell 40 and an insulating film 50. Both the cell 40 and the insulating film 50 are housed within the receiving cavity 11. The insulating film 50 surrounds the surface of the cell 40 except for the surface facing the top cover 20. The insulating film 50 serves as insulation. The cell 40 is connected to the terminal 30, and this connection enables connection to an external circuit.

[0060] Furthermore, the shell 10 and the top cover 20 are made of at least one of aluminum and stainless steel to meet the strength requirements of the shell 10 and the top cover 20.

[0061] To meet structural strength requirements, the housing 10 and the top cover 20 also have corresponding thickness ranges. The thickness of the housing 10 ranges from 0.5 mm to 2 mm, for example, the thickness of the housing 10 is one of 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, 2 mm, or any thickness between the above-mentioned thicknesses. The thickness of the top cover 20 ranges from 0.3 mm to 1 mm, for example, the thickness of the top cover 20 is one of 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, or any thickness between the above-mentioned thicknesses.

[0062] This application embodiment also provides a battery pack, which includes a busbar and a plurality of battery cells as described above, wherein the busbar connects the conductive portions 32 of two adjacent battery cells.

[0063] Because the battery cell features conductive portions 32 and a first identification portion 33 with varying roughness on the surface of the terminal post 30, the accuracy of welding positioning is significantly improved, effectively solving the positioning deviation problem caused by the uneven surface reflection in traditional welding. High-precision welding positioning reduces welding misalignment or incomplete welds, ensuring the stability of the electrical connection between the terminal post 30 and the busbar, reducing contact resistance, and thus improving the conductivity and thermal management efficiency of the battery module. This improved welding accuracy directly reduces localized overheating or uneven current caused by welding defects, significantly enhancing the operational stability and safety of the battery module.

[0064] The improved welding precision further optimizes the consistency of battery modules, avoiding performance differences in individual cells caused by poor welding, thereby extending the cycle life and overall service life of the battery pack. High-precision welding also reduces mechanical stress concentration in the welding area, lowering the risk of connection loosening due to thermal expansion or vibration, and improving the structural reliability of the module. In addition, improved welding quality reduces later maintenance costs, while providing more robust technical support for high-density integration and high-power applications of battery packs, achieving dual optimization of performance and lifespan.

[0065] Furthermore, the battery pack contains an array of multiple battery cells arranged in an array, and a busbar connects the conductive parts of two adjacent battery cells. On the plane where the first end face 31 is located, the orthographic projections of the busbar and the first identification part 33 are spaced apart. In this way, the poor solder joints formed by welding the first identification part 33 with the busbar due to excessive roughness can be avoided.

[0066] The battery pack according to embodiments of this application can be applied to fields such as consumer electronics, electric vehicles, energy storage systems, and industrial equipment. Furthermore, the battery pack can also be applied to electrical devices, which can be, but are not limited to, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc. In some embodiments of this application, the battery pack can not only serve as the operating power source for the electrical device but also as the driving power source for the electrical device, providing driving power to the electrical device.

[0067] Furthermore, the battery pack welding equipment includes a CCD vision system. This system is equipped with multiple CCD cameras that simultaneously acquire images of the first end faces 31 of multiple terminal posts 30. Image processing algorithms are used to identify the positional relationship between the conductive portion 32 and the first identification portion 33 of each terminal post 30. Because the conductive portion 32 and the first identification portion 33 have different roughness, the CCD vision system can accurately identify them, thereby achieving high-precision welding positioning to reduce welding misalignment or incomplete welds, ensuring the stability of the electrical connection between the terminal post 30 and the busbar.

[0068] In the embodiments of this application, the battery cells and battery packs can be referenced to each other and have the same or similar beneficial effects as any of the aforementioned battery cells. To avoid repetition, they will not be described again here.

[0069] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0070] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery cell, characterized in that, include: The housing (10) has an opening (12) and a receiving cavity (11) in communication; A top cover (20) is attached to the housing (10) and closes the opening (12); A pole post (30) is inserted through the top cover (20). The pole post (30) has a first end face (31) facing away from the housing (10). The first end face (31) has a conductive part (32) and a first identification part (33) spaced apart. The roughness of the first identification part (33) is greater than the roughness of the conductive part (32).

2. The battery cell according to claim 1, characterized in that, The pole post (30) includes a conductive block (34) and a conductive post (35). The conductive post (35) passes through the top cover (20). The conductive block (34) is connected to the end of the conductive post (35) away from the housing (10), and the end of the conductive post (35) away from the housing (10) passes through the conductive block (34). The conductive block (34) is provided with a first part (331) and the conductive part (32) at intervals. The conductive post (35) is provided with a second part (332). The first part (331) and the second part (332) are connected to form the first identification part (33).

3. The battery cell according to claim 2, characterized in that, The conductive post (35) is also provided with a second identification part (36), and the second part (332) is arranged around the second identification part (36).

4. The battery cell according to claim 3, characterized in that, Along the radial direction of the conductive post (35), the second portion (332) and the second identification portion (36) are spaced apart.

5. The battery cell according to claim 3, characterized in that, The second identification part (36) is a groove formed on the conductive post (35).

6. The battery cell according to claim 1, characterized in that, The first identification part (33) is at least one of the following: a frosted surface, a rough surface, or a surface formed by melting and solidifying metal.

7. The battery cell according to claim 1, characterized in that, The conductive part (32) is made of conductive material, and the conductive part (32) and the first identification part (33) are made of the same material or different materials.

8. The battery cell according to claim 1, characterized in that, The first end face (31) has a recess (37), the first identification part (33) is located on the bottom wall of the recess (37), and the first identification part (33) does not extend beyond the top of the recess (37).

9. The battery cell according to claim 1, characterized in that, The battery cell also includes a protective component that covers the first identification part (33).

10. A battery pack, characterized in that, It includes a busbar and a plurality of battery cells as described in any one of claims 1-9, wherein the busbar connects the conductive portions (32) of two adjacent battery cells.

Images