Adapter piece structure, battery cell structure and large energy storage battery

Abstract

The utility model provides an adapter piece structure, cell structure and energy storage big battery, adapter piece structure includes tab connecting part and post connecting part, tab connecting part is used for connecting with the tab of cell, post connecting part is connected with tab connecting part, post connecting part has first side, first side has the cleaning area that is used for the cleaning treatment, the first side has the cleaning area that is used for the cleaning treatment, the second side has the cleaning area that is used for the cleaning treatment. The cleaning area comprises a welding area and an annular area surrounding the periphery of the welding area, and the welding area is used for welding and fixing the pole connecting part and the pole of the cover plate, so that the welding area is ensured to be in a clean state before welding, the influence of impurities, oxides and the like on the welding quality is avoided, and the welding strength and reliability are improved; due to the existence of the annular area surrounding the welding area, external pollutants can be prevented from invading the welding area in the welding or connecting process, so that the purity and the stability of connection are improved, and high-quality welding of the pole connecting part and the pole can be ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of energy storage, and particularly relates to a connecting piece structure, a battery cell structure and a large energy storage battery. Background Art

[0002] The commonly used assembly scheme for square battery assembly is that after the battery cells are paired, they are welded together with the connecting piece, and then the welding area of the connecting piece and the pole column of the cover plate are welded and fixed by laser welding. However, due to foreign matters adhering to the welding area or the existence of an oxide layer, welding defects will occur in the welding of the connecting piece and the pole column. Content of the Utility Model

[0003] An embodiment of the utility model provides a connecting piece structure, a battery cell structure and a large energy storage battery, ensuring that the welding area for welding with the pole column is cleaned, and avoiding welding defect problems caused by foreign matters or oxidation.

[0004] In the first aspect, an embodiment of the utility model provides a connecting piece structure.

[0005] In one embodiment, the connecting piece structure includes:

[0006] An ear connecting part for connecting with the ear of the battery cell;

[0007] A pole column connecting part connected to the ear connecting part. The pole column connecting part has a first side, and the first side has a cleaning area for being cleaned. The cleaning area includes a welding area and an annular area surrounding the periphery of the welding area. The welding area is used for welding and fixing the pole column connecting part and the pole column of the cover plate.

[0008] In one embodiment, the distance between the boundary of the welding area and the outer boundary of the annular area is L, where L≥1.0 mm; and / or,

[0009] The area of the welding area is S1, the area of the cleaning area is S2, and the surface area of the first side is S3, where 0<S1 / S2≤1; and / or 0<S2 / S3≤1.

[0010] In one embodiment, the depth of the cleaning area is H, where 0.5 μm≤H≤1000 μm.

[0011] In one embodiment, the cleaning area is formed with a plurality of grooves and a plurality of protrusions, and the plurality of grooves and the plurality of protrusions are arranged alternately.

[0012] In one embodiment, the ear connecting part includes:

[0013] A main body connected to the pole column connecting part;

[0014] Two connecting arms are arranged opposite each other and spaced apart, and one end of each connecting arm is connected to the main body;

[0015] One of the two connecting arms and / or the main body is used to connect to one of the two tabs that are aligned with the two adjacent battery cells, and the other of the two connecting arms and / or the main body is used to connect to the other of the two tabs that are aligned with the two adjacent battery cells.

[0016] In one embodiment, the area of ​​the clean zone is S2;

[0017] The main body has a second side on the same side as the first side, the surface area of ​​the second side is S4, the surface area of ​​the first side is S3, wherein S3+S4>S2.

[0018] Secondly, embodiments of this utility model provide a battery cell structure.

[0019] In one embodiment, the cell structure includes the adapter structure as described above.

[0020] In one embodiment, it further includes:

[0021] Two battery cells are arranged at a distance along the X direction. Each battery cell has a first tab and a second tab arranged at a distance along the Y direction. The two first tabs of the two battery cells are positioned opposite each other, and the two second tabs of the two battery cells are positioned opposite each other.

[0022] Two adapter plate structures are provided, wherein the electrode connecting portion of one of the two adapter plate structures is connected to two first electrodes that are aligned, and the electrode connecting portion of the other of the two adapter plate structures is connected to two second electrodes that are aligned.

[0023] The cover plate is provided with two poles spaced apart along the Y direction, and the two poles are welded and fixed to the corresponding pole connection parts in the two welding areas respectively.

[0024] In one embodiment, the electrode connecting portion of one of the two adapter plate structures is welded and fixed to the two aligned first electrode tabs; and / or,

[0025] The electrode connection portion of the other of the two adapter plate structures is welded and fixed to the two second electrodes that are aligned.

[0026] Thirdly, embodiments of this utility model provide a large energy storage battery.

[0027] In one embodiment, the large energy storage battery includes the cell structure described above.

[0028] The beneficial effects of the embodiments of this utility model are as follows:

[0029] In this embodiment of the invention, the adapter plate is divided into a tab connection part and a terminal connection part. The tab connection part is specifically responsible for connecting to the tab of the battery cell, while the terminal connection part is responsible for connecting to the external terminal. This clear division of labor improves the stability and reliability of the overall structure. The cleaning area includes a welding area and an annular area surrounding the welding area. This design aims to ensure that the welding area is clean before welding, avoiding the influence of impurities, oxides, etc., on the welding quality, thereby improving the strength and reliability of the weld. A clean welding surface helps reduce contact problems caused by corrosion, oxidation, etc., thus extending the service life of large energy storage battery packs or related equipment. By clearly defining the cleaning area, subsequent maintenance and cleaning work becomes more targeted, reducing maintenance difficulty and cost. The terminal connection part is firmly connected to the battery cell terminal through welding, enhancing the stability and strength of the overall structure and helping to resist the influence of external factors such as vibration and impact. Furthermore, the existence of the "annular area" surrounding the welding area helps prevent external contaminants from entering the welding area during welding or connection, thereby improving the purity and stability of the connection and ensuring that the terminal connection part and the terminal form a high-quality weld. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of the adapter plate structure provided in an embodiment of the present invention;

[0032] Figure 2 This is a schematic diagram of the battery cell structure provided in an embodiment of the present invention;

[0033] Figure 3 yes Figure 2 One of the schematic diagrams of the adapter plate structure and the pole piece structure shown;

[0034] Figure 4 yes Figure 2 The second schematic diagram of the adapter plate structure and the pole structure is shown.

[0035] Figure 5 yes Figure 2 The diagram shows the structure of the pole connection and the pole itself.

[0036] Figure 6 yes Figure 5 The diagram shown is a magnified view of part A.

[0037] Explanation of reference numerals in the attached figures:

[0038] 100. Cell Structure

[0039] 10. Adapter plate structure;

[0040] 1. Electrode connection part; 11. Main body; 12. Connecting arm;

[0041] 2. Pole post connection part, 21. First side, 211. Cleaning area, 2111. Welding area, 2112. Annular area;

[0042] 31. Groove; 32. Protrusion;

[0043] 20. Battery cell; 201. Tab; 202. First tab; 203. Second tab;

[0044] 30. Cover plate; 301. Pole post. Detailed Implementation

[0045] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of the present utility model and are not intended to limit the present utility model. In the present utility model, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0046] The common assembly method for square batteries is to pair the cells and weld them together with the adapter plate. Then, the welding area of ​​the adapter plate and the terminal of the cover plate are fixed by laser welding. However, due to foreign matter adhering to the welding area or the presence of an oxide layer, defects may occur in the welding of the adapter plate and the terminal.

[0047] In view of this, this utility model proposes an adapter plate structure, a cell structure, and a large energy storage battery. Figure 1 This is a schematic diagram of the adapter plate structure provided in an embodiment of the present invention. Figure 2 This is a schematic diagram of the battery cell structure provided in an embodiment of the present invention. Figure 3 yes Figure 2 One of the schematic diagrams of the adapter plate structure and the pole structure shown. Figure 4 yes Figure 2The second schematic diagram of the adapter plate structure and the pole structure is shown. Figure 5 yes Figure 2 The diagram shows the structure of the terminal connection and the terminal. The adapter structure provided by this invention ensures that the welding area for welding to the terminal is clean, avoiding welding defects caused by foreign matter or oxidation. The cell assembly will be described in detail below with reference to the main accompanying drawings.

[0048] Reference Figure 1 and Figure 2 The adapter structure 10 includes a tab connection part 1 and a pole connection part 2. The tab connection part 1 is used to connect to the tab 201 of the battery cell 20. The pole connection part 2 is connected to the tab connection part 1. The pole connection part 2 has a first side 21. The first side 21 has a cleaning area 211 for cleaning. The cleaning area 211 includes a welding area 2111 and an annular area 2112 surrounding the welding area 2111. The welding area 2111 is used to weld and fix the pole connection part 2 to the pole 301 of the cover plate 30.

[0049] It should be noted that, referring to Figure 5 The first side 21 refers to the side of the pole post connection 2 that is away from the pole post 301.

[0050] In an embodiment of this utility model, the adapter structure 10 is divided into a tab connection portion 1 and a terminal connection portion 2. The tab connection portion 1 is used to connect with the tab 201 of the cell 20, while the terminal connection portion 2 is used to connect with the terminal 301 of the cover plate 30, thereby improving the stability and reliability of the overall structure. The first side 21 has a cleaning area 211 for cleaning treatment. The cleaning area 211 includes a welding area 2111 and an annular area 2112 surrounding the welding area 2111. This design aims to ensure that the welding area 2111 is in a clean state before welding, avoiding welding defects caused by impurities, oxides, etc., thereby improving the strength and reliability of the welding. A clean welding surface helps to reduce contact problems caused by corrosion, oxidation, etc., thereby extending the service life of large energy storage batteries or related equipment. By welding, the pole connection 2 is firmly connected to the pole 301 of the cover plate 30, which enhances the stability and strength of the overall structure and helps to resist the influence of external factors such as vibration and impact. In addition, the presence of the annular area 2112 surrounding the welding area 2111 helps to prevent external contaminants from entering the welding area 2111 during the welding or connection process, thereby improving the purity and stability of the connection and ensuring that the pole connection 2 and the pole 301 can form a high-quality weld.

[0051] The shapes of the welding area 2111 and the annular area 2112 surrounding the welding area 2111 can vary, for example, refer to Figure 3 In one embodiment, the welding area 2111 is circular in shape, and the annular area 2112 is annular in shape. (Refer to...) Figure 4 In another embodiment, the welding area 2111 is rectangular in shape, and the annular area 2112 is square. In yet another embodiment, the welding area 2111 is circular, and the annular area 2112 is square. Of course, in other embodiments, the shape of the welding area 2111 can also be irregular, and similarly, the shape of the annular area 2112 can be an irregular ring. Specifically, the shapes of the welding area 2111 and the annular area 2112 can be set as needed, and this application does not limit them.

[0052] It should be noted that there are various ways to clean the first side 21 to form a clean area. For example, in one embodiment, the first side 21 is pre-treated with laser cleaning, which causes foreign matter on the surface of the first side 21 to be vaporized and removed at high temperature, reducing welding defects. Moreover, laser cleaning pre-treatment can etch the surface of the first side 21, making the smooth surface rough. When the laser hits the surface of the first side 21, diffuse reflection does not occur instead of specular reflection (e.g., when the laser hits the surface of the first side 21). Figure 4 This method results in minimal energy loss, with most energy absorbed by the welded components, reducing the risk of incomplete welds. The addition of laser cleaning technology before welding the electrode connection 2 further improves the laser penetration welding quality and reduces poor weld appearance. Of course, in other embodiments, the first side 21 can also be cleaned using methods such as sandblasting, wet chemical cleaning, deionized water cleaning, or ultrasonic cleaning to form a clean area. Specifically, this application does not limit the specific method by which the first side 21 is cleaned to form a clean area.

[0053] A laser is emitted from a laser device to clean the first side 21 of the electrode connector 2. In one embodiment, the laser power is in the range of 100W to 700W, which can effectively remove the oxide layer on the surface of the adapter piece, ensuring uniform heat absorption and conduction during the welding process. Additionally, it can roughen the surface of the first side 21, changing specular reflection to diffuse reflection during laser welding, reducing energy loss, decreasing weld defects, and improving welding reliability. When the laser power is low (<100W), the cleaning depth is limited (<0.5μm) due to insufficient energy density, resulting in incomplete removal of the oxide layer on the surface of the first side 21. Furthermore, the surface roughness of the first side 21 is insufficient to reduce the diffuse reflection intensity of laser welding, causing significant energy loss and leading to subsequent laser penetration welding defects. When the laser power is high (>700W), the energy density increases significantly, and the cleaning depth is much greater than 1000μm. Although it can rapidly heat and remove deep contaminants from the material surface, it may cause severe unevenness on the surface of the first side 21, resulting in large fluctuations in laser welding defocus and a higher risk of welding defects.

[0054] A laser is emitted from a laser device to clean the first side 21 of the electrode connector 2. In one embodiment, the laser frequency is between 100Hz and 800Hz. This effectively removes the oxide layer on the surface of the adapter plate, ensuring uniform heat absorption and conduction during the welding process. Additionally, it roughens the surface of the first side 21, reducing specular reflection to diffuse reflection during laser welding, minimizing energy loss, reducing weld defects, and improving welding reliability. When the frequency is below 100Hz, the cleaning point density decreases significantly, leading to increased spacing between cleaning points. This may prevent effective coverage of the entire cleaning area 211, resulting in some areas being uncleaned. When the frequency is above 800Hz, the cleaning point density is too high, and adjacent cleaning points may overlap, causing localized areas to be irradiated by multiple laser pulses, resulting in an uneven cleaning effect. The cleaning depth is affected not only by the laser power but also by the laser frequency. While high-frequency laser pulses can increase the density of cleaning points, they can also lead to over-cleaning in localized areas due to repeated irradiation, resulting in a cleaning depth exceeding expectations (e.g., >1000μm). Although this can rapidly heat and remove deep-seated contaminants from the material surface, it can cause severe unevenness on the first side 21 surface, leading to significant fluctuations in laser welding defocus and a higher risk of welding defects. Conversely, low-frequency laser pulses, due to their low cleaning point density, may fail to achieve sufficient cleaning depth, leaving the oxide layer on the first side 21 surface unremoved. Furthermore, the surface roughness of the first side 21 may be insufficient to reduce the diffuse reflection intensity of laser welding, resulting in significant energy loss and subsequent incomplete laser penetration welding.

[0055] A laser is emitted from a laser device to clean the first side 21 of the electrode connector 2. In one embodiment, the laser scanning speed is between 500 mm / s and 20000 mm / s, which helps maintain the stability and uniformity of laser energy, thereby achieving high-quality cleaning or welding results. Additionally, it effectively removes the oxide layer on the surface of the adapter plate, ensuring uniform heat absorption and conduction during the welding process. Furthermore, it roughens the surface of the first side 21, changing specular reflection to diffuse reflection during laser welding, reducing energy loss, decreasing weld defects, and improving welding reliability. When the scanning speed is below 500 mm / s, the welding cycle (or cleaning cycle) will be correspondingly prolonged due to the slow processing speed, leading to a decrease in production capacity. When the scanning speed is too fast (above 20000 mm / s), the laser beam's dwell time on the material surface is extremely short, which may result in insufficient laser energy acting on the material surface, causing energy instability and uneven cleaning. When the scanning speed is below 500 mm / s, production efficiency decreases significantly, affecting production capacity.

[0056] Reference Figure 1In one embodiment, the distance between the boundary of the welding area 2111 and the outer boundary of the annular area 2112 is L, where L ≥ 1.0 mm. This distance of 1.0 mm or more provides greater tolerance for welding operations. During welding, even slight offsets or fluctuations, as long as the offset is within the distance between the boundary of the welding area 2111 and the outer boundary of the annular area 2112, ensure that the welding operation falls entirely within the clean area, thus avoiding poor or incomplete welding and improving the overall quality of the weld. During welding, a large amount of heat is generated. A distance of 1.0 mm or more between the boundary of the welding area 2111 and the outer boundary of the annular area 2112 acts as a heat buffer, helping to disperse and alleviate the concentrated heat generated in the welding area 2111, reducing the impact of thermal stress on weld quality. This contributes to improving the thermal stability and durability of the weld joint. The distance between the boundary of the welding area 2111 and the outer boundary of the annular area 2112 is greater than or equal to 1.0 mm, which makes it easier to control the size and shape of the welding area 2111 and the annular area 2112 during processing, reducing processing difficulty and cost. Simultaneously, in subsequent maintenance, this design also makes cleaning and inspection of the first side easier, reducing maintenance complexity and cost. When the distance between the boundary of the welding area 2111 and the outer boundary of the annular area 2112 is sufficiently large (L≥1.0 mm), contaminants around the welding area 2111 can be more effectively isolated and removed, ensuring that the welding area 2111 reaches a high cleanliness standard before welding. This results in a purer and more stable welding interface during laser welding, thereby improving the quality and strength of the weld joint.

[0057] In addition, when the distance between the boundary of the welding area 2111 and the outer boundary of the annular area 2112 is less than 1 mm, extremely high precision is required during laser welding to control the welding position and ensure that the welding point completely falls within the welding area 2111. This almost reaches the operating requirements at the micron level, posing extremely high challenges to the equipment precision and the technical level of the operators. When the distance between the boundary of the welding area 2111 and the outer boundary of the annular area 2112 is less than 1 mm, it will be almost impossible to accommodate and isolate any impurities or contaminants around the welding area 2111 between the boundary of the welding area 2111 and the outer boundary of the annular area 2112. Even with strict cleaning, it is very difficult to ensure that the welding area 2111 meets the ideal cleanliness standard before welding. Minute factors such as heat and air flow generated during the welding process may have a significant impact on the cleaning effect within such a small distance, resulting in unstable welding quality. The distance between the boundary of the welding area 2111 and the outer boundary of the annular area 2112 being less than 1 mm greatly limits the selection and adjustment range of the welding process, making the process adaptability during production extremely poor.

[0058] It should be noted that the distance between the boundary of the welding area 2111 and the outer boundary of the annular area 2112 can be 1 mm, 1.1 mm, 1.3 mm, 1.5 mm, 1.6 mm, 1.8 mm, 2 mm, 2.3 mm, or 2.5 mm, etc. Specifically, the distance between the boundary of the welding area 2111 and the outer boundary of the annular area 2112 can be selected according to needs, and this application does not make any limitations in this regard.

[0059] In an embodiment, the area of the welding area 2111 is S1, the area of the cleaning area 211 is S2, and the surface area of the first side is S3, where 0 < S1 / S2 < 1; and / or 0 < S2 / S3 ≤ 1. In this way, when S1 / S2 is less than 1, it ensures that the welding area 2111 is completely within the cleaning area 211, making the welding area 2111 in a clean state before welding and avoiding welding defects caused by impurities, oxides, etc. At the same time, S1 / S2 being less than 1 can also protect the welding area 2111 from being affected by contaminants such as impurities and oxides during the welding process. When S2 / S3 is less than or equal to 1, it is achieved that the area of the cleaning area 211 is greater than or equal to the surface area of the first side, which means that the cleaning area 211 almost covers the entire surface area of the first side. In this way, the cleaning area 211 is relatively large, facilitating the welding operation. When 0 < S1 / S2 < 1 and 0 < S2 / S3 ≤ 1, welding operation is achieved while ensuring welding quality and cleanliness.

[0060] It should be noted that S1 / S2 can be 0.1, 0.2, 0.3, 0.35, 0.4, 0.5, 0.54, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, or 0.95, etc. Specifically, the ratio of S1 / S2 can be selected as needed, and this application does not limit it. Additionally, S2 / S3 can be 0.1, 0.15, 0.18, 0.2, 0.25, 0.3, 0.35, 0.4, 0.5, 0.54, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, or 1, etc. Specifically, the ratio of S2 / S3 can be selected as needed, and this application does not limit it.

[0061] Reference Figure 5 and Figure 6 In one embodiment, the depth of the cleaning zone 211 is H, where 0.5 μm ≤ H ≤ 1000 μm. When the depth of the cleaning zone 211 is too shallow (less than 0.5 μm), the oxide layer or impurities on the surface of the first side 21 cannot be completely removed, resulting in insufficient surface roughness to achieve adequate diffuse reflection intensity for laser welding. This leads to significant energy loss and subsequent incomplete laser penetration welding. When the depth of the cleaning zone 211 is greater than 1000 μm, the surface of the first side 21 will be severely uneven, causing large fluctuations in laser welding defocus and making welding defects more likely. When the depth of the cleaning zone 211 is between 0.5 μm and 1000 μm, it ensures that the oxide layer or impurities on the surface of the first side 21 are completely removed. Furthermore, this depth range improves the surface roughness of the first side 21, making it suitable for laser welding. When the surface roughness is moderate, the diffuse reflection intensity of laser welding decreases, thereby reducing energy loss and improving welding efficiency and quality. When the depth of the cleaning zone 211 is between 0.5 μm and 1000 μm, welding defects caused by insufficient or excessive cleaning can be avoided. Problems such as incomplete welds, porosity, and slag inclusions can be effectively controlled. When the depth of the cleaning zone 211 is between 0.5 μm and 1000 μm, the energy transfer during the welding process is more stable, reducing fluctuations in welding results caused by changes in surface condition.

[0062] Reference Figure 5In one embodiment, the cleaning area 211 has a groove 31 and multiple protrusions 32, which are arranged alternately. This alternating arrangement of grooves 31 and protrusions 32 significantly increases the surface roughness of the cleaning area 211. The originally smooth surface becomes uneven after cleaning, a change crucial for laser welding. Smooth surfaces are prone to specular reflection, meaning most of the laser beam is directly reflected back, resulting in a significant reduction in the energy received by the weldment. Rough surfaces, on the other hand, tend to exhibit diffuse reflection, where the laser beam scatters across the surface, increasing the contact area and contact time with the weldment, thereby improving energy absorption efficiency. This diffuse reflection phenomenon allows laser energy to be distributed more evenly in the welding area 2111, reducing energy loss due to reflection. Most of the laser energy can be effectively absorbed by the weldment and converted into heat energy to melt the metal, thus achieving high-quality welding. After the grooves 31 and protrusions 32 are formed in the cleaning area 211, due to reduced energy loss and a more uniform distribution, the weldment can receive sufficient energy to melt the metal and form a strong metallurgical bond. Therefore, this design helps reduce the risk of incomplete soldering and improves the strength and reliability of welded joints.

[0063] Reference Figure 1 and Figure 2In one embodiment, the tab connection portion 1 includes a main body 11 and two connecting arms 12. The main body 11 is connected to the terminal post connection portion 2. The two connecting arms 12 are arranged opposite each other and spaced apart. One end of each connecting arm 12 is connected to the main body 11. One of the two connecting arms 12 and / or the main body 11 is used to connect to one of the two tabs 201 of two adjacent cells 20, and the other of the two connecting arms 12 and / or the main body 11 is used to connect to the other of the two tabs 201 of two adjacent cells 20. Thus, the main body 11, as the core component of the entire tab connection portion 1, undertakes the task of connecting to the terminal post connection portion 2, ensuring that the current can be smoothly transmitted to various parts of the energy storage battery. The opposite and spaced arrangement of the two connecting arms 12 ensures the stability of the connection and allows the connecting arms 12 to flexibly connect to the tabs 201 of adjacent cells 20. One end of the connecting arm 12 is connected to the main body 11, forming a stable support structure. Each connecting arm 12 and / or body 11 is designed to connect to a specific tab 201 of an adjacent cell 20. This alignment connection method not only simplifies the connection process but also improves the accuracy and reliability of the connection. When the energy storage battery is operating, current enters the body 11 through the terminal connection 2 and then flows through the two connecting arms 12 to the tabs 201 of the adjacent cell 20, achieving efficient current transmission. Because the two connecting arms 12 are positioned opposite each other and spaced apart, and are tightly connected to the body 11, this design greatly enhances the stability of the connection. Even in harsh environments such as vibration or shock, the connection remains robust. The alignment connection method allows current to be directly and efficiently transmitted to the tabs 201 of the adjacent cell 20, reducing energy loss during transmission. When maintenance or replacement of the cell 20 is required, it can be easily performed by simply disconnecting the corresponding connecting arm 12 from the tab 201. This modular design simplifies the maintenance process and reduces maintenance costs and time.

[0064] It should be noted that, in one embodiment, two connecting arms 12 may be used to connect to two tabs 201 aligned with two adjacent battery cells 20, thus simplifying the connection operation between the tabs 201 and the connecting arms 12. In another embodiment, the other connecting arm 12 and the main body 11 are used to connect to one of the two tabs 201 aligned with two adjacent battery cells 20, and the other connecting arm 12 and the main body 11 are used to connect to the other of the two tabs 201 aligned with two adjacent battery cells 20, thus ensuring a secure connection between the tab 201 and the tab connecting portion 1. In other embodiments, the main body 11 may be connected to the two tabs 201 aligned with two adjacent battery cells 20 respectively. Specifically, the method of connecting the tab connecting portion 1 and the tabs 201 can be selected as needed, and this application does not limit it.

[0065] In one embodiment, the area of ​​the cleaning area 211 is S2, and the main body 11 has a second side on the same side as the first side. The surface area of ​​the second side is S4, and the surface area of ​​the first side is S3, where S3 + S4 > S2. Thus, not all surfaces of the first and second sides are cleaned, thereby ensuring cleaning effectiveness while avoiding resource waste and saving costs. Since only the welding area 2111 needs to be cleaned, when S3 + S4 = S2, it would require cleaning both surfaces, leading to resource waste and increased production costs.

[0066] Reference Figure 2 The present invention also proposes a battery cell structure 100, which includes the adapter plate structure 10 as described above. The specific structure of the adapter plate structure 10 is as described in the above embodiments. Since the battery cell structure 100 adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0067] Continue to refer to Figure 2In one embodiment, the battery cell structure 100 further includes two battery cells 20, two adapter plate structures 10, and a cover plate 30. The two battery cells 20 are spaced apart along the X direction. Each battery cell 20 has a first electrode 202 and a second electrode 203 spaced apart along the Y direction. The two first electrodes 202 of the two battery cells 20 are positioned opposite each other, and the two second electrodes 203 of the two battery cells 20 are positioned opposite each other. The electrode connecting part 1 of one of the two adapter plate structures 10 is connected to the two aligned first electrodes 202, and the electrode connecting part 1 of the other of the two adapter plate structures 10 is connected to the two aligned second electrodes 203. The cover plate 30 is provided with two pole posts 301 spaced apart along the Y direction. The two pole posts 301 are welded and fixed to the corresponding pole post connecting parts 2 in two welding areas 2111 respectively. In this way, the two battery cells 20 are spaced apart along the X direction. This layout is beneficial for heat dissipation and reducing stress concentration inside the battery cells 20. Each cell 20 has first tabs 202 and second tabs 203 spaced apart along the Y direction. This design allows the same type of tabs 201 of adjacent cells 20 to be aligned, facilitating subsequent connection operations. The adapter structure 10 is designed to connect the tabs 201 of adjacent cells 20, allowing current to flow inside the cell 20. Each adapter structure 10 includes a tab connection part 1, which can be connected to two aligned first tabs 202 or two aligned second tabs 203. The two adapter structures 10 are responsible for connecting the two aligned first tabs 202 and the two aligned second tabs 203 respectively, ensuring separate current transmission and avoiding the risk of short circuits. The cover plate 30 serves as the external protective structure of the cell 20 and also has two posts 301 spaced apart along the Y direction. These two posts 301 are the connection points between the cell 20 and the external circuit. The design of the welding area 2111 allows the electrode post 301 to be firmly welded to the corresponding adapter structure 10, ensuring smooth current transmission from the inside of the cell 20 to the external circuit. Connecting the tabs 201 of adjacent cells 20 via the adapter structure 10 achieves efficient current transmission within the cell 20. This design reduces resistance and energy loss during current transmission. The welding and fixing of the electrode post 301 on the cover plate 30 to the adapter structure 10 ensures a stable connection between the cell 20 and the external circuit, further improving current transmission efficiency. The spacing of the cells 20 and the ingenious design of the adapter structure 10 make the overall structure of the cell 20 more stable. This design helps reduce deformation and stress concentration of the cell 20 during charging and discharging. The protective function of the cover plate 30 further enhances the structural stability of the cell 20, improving its durability and safety. Transmitting current to different electrodes 301 via the adapter structure 10 avoids the risk of short circuits and improves the safety of the cell 20. The sealing and protective function of the cover plate 30 also helps to prevent safety accidents such as leakage or explosion inside the battery cell 20.

[0068] In one embodiment, the tab connection portion 1 of one of the two adapter plate structures 10 is welded and fixed to the two aligned first tabs 202. This direct welding and fixing of the tab connection portion 1 of the adapter plate structure 10 to the two aligned first tabs 202 reduces the resistance during current transmission, thereby improving the efficiency of current transmission. This design ensures that the current can flow smoothly inside the cell 20, reducing energy loss. The welding fixing method makes the current path more direct and shorter, avoiding unnecessary detours during current transmission and further improving transmission efficiency. Welding fixing not only achieves electrical connection but also serves as a mechanical fixation. It forms a strong connection between the tab connection portion 1 and the first tabs 202, helping to enhance the overall stability of the cell structure 100. During the charging and discharging process of the cell 20, changes in current may generate stress. Welding fixing reduces the risk of the first tabs 202 loosening or falling off due to stress changes, thereby improving the reliability and durability of the cell 20. Welding fixing is a standardized connection method, facilitating automation and standardized operation during manufacturing and assembly. This helps improve production efficiency and reduce manufacturing costs. Compared with other connection methods, welding fixation does not require additional connectors or fasteners. This helps simplify the structural design of the cell 20, reducing the number and weight of parts. Welding fixation ensures tight contact between the electrode connection 1 and the first electrode 202, avoiding the risk of short circuits due to poor contact. The welded connection points are clearly visible, facilitating inspection and judgment during maintenance and repair. If a problem is found at the connection point, it can be repaired or replaced in a timely manner. Welding fixation reduces the number and types of connectors, thereby reducing the probability of failure. When the cell 20 fails, the problem can be located and dealt with more quickly.

[0069] In one embodiment, the tab connection portion 1 of the other of the two adapter plate structures 10 is welded and fixed to two aligned second tabs 203. This direct welding and fixing of the tab connection portion 1 of the adapter plate structure 10 to the two aligned second tabs 203 reduces resistance during current transmission, thereby improving current transmission efficiency. This design ensures smooth current flow within the cell 20, reducing energy loss. The welding fixation method makes the current path more direct and shorter, avoiding unnecessary detours during transmission and further improving transmission efficiency. Welding fixation not only achieves electrical connection but also serves as a mechanical fixation. It forms a strong connection between the tab connection portion 1 and the second tabs 203, contributing to enhanced overall stability of the cell structure 100. During the charging and discharging process of the cell 20, current changes may generate stress. Welding fixation reduces the risk of loosening or detachment of the second tabs 203 due to stress changes, thereby improving the reliability and durability of the cell 20. Welding fixation is a standardized connection method, facilitating automation and standardized operation during manufacturing and assembly. This helps improve production efficiency and reduce manufacturing costs. Compared with other connection methods, welding fixation does not require additional connectors or fasteners. This helps simplify the structural design of the cell 20, reducing the number and weight of parts. Welding fixation ensures tight contact between the electrode connection 1 and the second electrode 203, avoiding the risk of short circuits due to poor contact. The welded connection points are clearly visible, facilitating inspection and diagnosis during maintenance and repair. If a problem is found at the connection point, it can be repaired or replaced promptly. Welding fixation reduces the number and types of connectors, thereby reducing the probability of failure. When the cell 20 fails, the problem can be located and addressed more quickly.

[0070] The present invention also proposes a large energy storage battery, which includes the cell structure 100 as described above. The specific structure of the cell structure 100 is referred to in the above embodiments. Since the present energy storage battery adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0071] The embodiments of this utility model have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this utility model. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A connector structure, characterized in that, Comprising: An ear connection part for connecting with the ear of an electric core. A pole connection part connected to the ear connection part. The pole connection part has a first side with a cleaning area for cleaning treatment. The cleaning area includes a welding area and an annular area surrounding the periphery of the welding area. The welding area is used for welding and fixing the pole connection part to the pole of the cover plate.

2. The adapter plate structure according to claim 1, characterized in that, The distance between the boundary of the welding area and the outer boundary of the annular area is L, where L≥1.0mm; and / or The area of the welding area is S1, the area of the cleaning area is S2, and the surface area of the first side is S3, where 0<S1 / S2<1; and / or 0<S2 / S3≤1.

3. The adapter plate structure according to claim 1, characterized in that, The depth of the cleaning area is H, where 0.5μm≤H≤1000μm.

4. The adapter plate structure according to claim 1, characterized in that, The cleaning area is formed with a plurality of grooves and a plurality of protrusions, and the plurality of grooves and the plurality of protrusions are arranged alternately.

5. The adapter plate structure according to claim 1, characterized in that, The ear connection part includes: A main body connected to the pole connection part. Two connecting arms which are opposite and spaced apart. One end of each of the two connecting arms is connected to the main body. One of the two connecting arms and / or the main body is used for connecting with one of the two ears of two adjacent electric cores arranged in alignment, and the other of the two connecting arms and / or the main body is used for connecting with the other of the two ears of two adjacent electric cores arranged in alignment.

6. The adapter plate structure according to claim 5, characterized in that, The area of the cleaning area is S2; The main body has a second side on the same side as the first side. The surface area of the second side is S4, and the surface area of the first side is S3, where S3+S4>S2.

7. A battery cell structure, characterized in that, Comprising the adapter plate structure according to any one of claims 1 to 6.

8. The cell structure according to claim 7, characterized in that, Further comprising: Two electric cores arranged at intervals in the X direction. Each electric core has a first ear and a second ear arranged at intervals in the Y direction. The two first ears of the two electric cores are in alignment, and the two second ears of the two electric cores are in alignment. Two of the adapter plate structures. The ear connection part of one of the two adapter plate structures connects the two first ears arranged in alignment, and the ear connection part of the other of the two adapter plate structures connects the two second ears arranged in alignment. A cover plate provided with two poles arranged at intervals in the Y direction. The two poles are welded and fixed to the corresponding pole connection parts in the two welding areas respectively.

9. The cell structure according to claim 8, characterized in that, The ear connection part of one of the two adapter plate structures is welded and fixed to the two first ears arranged in alignment; and / or The ear connection part of the other of the two adapter plate structures is welded and fixed to the two second ears arranged in alignment.

10. A large energy storage battery, characterized in that: Comprising the electric core structure according to any one of claims 7 to 9.

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