Single battery

Abstract

The utility model provides a single battery. The single battery comprises a shell; the cover plate assembly is connected with the shell and is encircled with the shell to form a cavity; the cover plate assembly is provided with an electrode terminal; the electrode assembly is located in the cavity and comprises a first electrode assembly and a second electrode assembly which are arranged side by side in the width direction of the cover plate assembly; one of the two ends of the pin is connected with the electrode terminal; the other one is respectively connected with the first electrode assembly and the second electrode assembly; the projection of the connection position of the pin and the first electrode assembly in the direction perpendicular to the length direction of the cover plate assembly is not overlapped with the projection of the connection position of the pin and the second electrode assembly in the direction perpendicular to the length direction of the cover plate assembly. The tabs with the same polarity of the electrode assembly can avoid each other and have sufficient extension space, so that the tabs do not need to be cut before connection, burrs are prevented from being formed on the edges of the tabs, and the product quality and the production efficiency of the battery are improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more particularly to a single-cell battery. Background Technology

[0002] Prismatic batteries are a common type of single-cell battery. Due to their thinness and narrow pin width, the tabs of the electrode assembly need to be properly trimmed before connecting to the pins to prevent interference between tabs of the same polarity. However, the trimming process can easily create burrs on the edges of the tabs, leading to abnormal high-voltage testing or self-discharge problems in the single-cell battery, thus affecting production efficiency and product yield. Utility Model Content

[0003] In view of the above, this application aims to provide a single-cell battery to solve some or all of the aforementioned technical problems.

[0004] For the purposes described above, this application provides a single-cell battery, comprising:

[0005] case;

[0006] A cover plate assembly is connected to the housing and surrounds it to form a cavity; the cover plate assembly is provided with electrode terminals;

[0007] An electrode assembly, located within the cavity, includes a first electrode assembly and a second electrode assembly arranged side-by-side along the width direction of the cover plate assembly;

[0008] The pin has one end connected to the electrode terminal and the other end connected to the first electrode assembly and the second electrode assembly respectively. The projection of the connection position of the pin and the first electrode assembly perpendicular to the length direction of the cover plate assembly does not overlap with the projection of the connection position of the pin and the second electrode assembly perpendicular to the length direction of the cover plate assembly.

[0009] As can be seen from the above, in the single cell provided by this application, the projection of the connection position of the pin and the first electrode assembly perpendicular to the length direction of the cover assembly does not overlap with the projection of the connection position of the pin and the second electrode assembly perpendicular to the length direction of the cover assembly. This allows the tabs of the same polarity of the first electrode assembly and the second electrode assembly to have sufficient extension space and achieve mutual avoidance, preventing interference between different tabs. Moreover, when the tabs have sufficient extension space, the cutting process can be eliminated, reducing connection costs and eliminating the problem of burrs on the edge of the tabs caused by cutting, so as to prevent the single cell from having abnormal high voltage test or self-discharge phenomenon, thereby improving battery quality and production efficiency. Attached Figure Description

[0010] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0011] Figure 1 This is a schematic diagram illustrating the connection between the electrode assembly and the pins in the relevant technical description.

[0012] Figure 2 This is a schematic diagram of a single battery cell described in the embodiments of this application;

[0013] Figure 3 This is a schematic diagram illustrating the connection between the electrode assembly and the two pins described in the embodiments of this application;

[0014] Figure 4 This is a schematic diagram of the connection between the first pin and electrode assembly described in the embodiments of this application;

[0015] Figure 5 This is an exploded view of the first pin and electrode assembly described in the embodiments of this application;

[0016] Figure 6 This is a schematic diagram of the connection between the electrode tab and the second connecting part in Example 1 of the embodiments described in this application;

[0017] Figure 7 This is a schematic diagram of the connection between the electrode tab and the second connecting part in Example 2 of the embodiments described in this application;

[0018] Figure 8 This is a schematic diagram of the connection between the electrode tab and the second connecting part in Example 3 of the embodiments described in this application;

[0019] Figure 9 This is a schematic diagram of the connection between the electrode tab and the second connecting part in Example 4, which is described in the embodiments of this application;

[0020] Figure 10 This is a schematic diagram illustrating the connection between the pin and electrode assembly as described in the embodiments of this application;

[0021] Figure 11 This is an exploded view of the second type of pin and electrode assembly described in the embodiments of this application;

[0022] Figure 12 This is a schematic diagram of the connection between the electrode tab and the sub-connector in Example 5, as described in the embodiments of this application;

[0023] Figure 13 This is a schematic diagram of the connection between the electrode tab and the sub-connector in Example Six, which is described in the embodiments of this application;

[0024] Figure 14 This is a schematic diagram of the connection between the tab and the sub-connector in Example 7, which is described in the embodiments of this application.

[0025] Explanation of reference numerals in the attached figures:

[0026] 1. Shell;

[0027] 2. Cover plate assembly; 201. Electrode terminals;

[0028] 3. Electrode assembly; 301. First electrode assembly; 302. Second electrode assembly; 303. Tab; 3031. Positive electrode tab; 3032. Negative electrode tab;

[0029] 4. Pins; 401, Positive pin; 402, Negative pin; 410, First connecting part; 420, Second connecting part; 421, Sub-connecting part;

[0030] 5. Linear grooving;

[0031] 601, First solder mark; 602, Second solder mark. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with specific embodiments and the accompanying drawings.

[0033] It should be noted that, unless otherwise defined, the technical or scientific terms used in the embodiments of this application should have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," and similar terms used in this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word covers the element or object listed following the word and its equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are only used to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0034] A single battery cell, such as a prismatic battery, consists of a casing, a cover plate assembly, electrode terminals, pins, and electrode assemblies. For the battery, the electrode terminals are electrically connected to the electrode assemblies via pins, forming the internal circuit structure. Currently, single batteries typically employ a multi-cell design, meaning the electrode assembly includes multiple sub-electrode assemblies to meet capacity requirements.

[0035] As batteries become increasingly thinner and lighter, their overall thickness gradually decreases, thus requiring a reduction in the width of pin 4. Specifically, as... Figure 1 As shown, Figure 1 This diagram illustrates the connection between electrode assembly 3 and pin 4 as described in related technologies. The battery has a dual-cell structure, meaning electrode assembly 3 consists of a first electrode assembly 301 and a second electrode assembly 302. Before welding electrode assembly 3 to pin 4, the tabs 303 connecting electrode assembly 3 to the surface of pin 4 need to be appropriately cut to reduce the length of tabs 303 and ensure that tabs 303 of the same polarity do not interfere with pin 4 after welding. However, during the cutting process of tabs 303, tiny burrs are easily formed on the cut edges of tabs 303. In actual use, these burrs may form microcircuit structures within the battery and cause self-discharge problems, leading to a decrease in battery quality. Furthermore, when the battery undergoes high-voltage testing, the electric field formed by the burrs interferes with the connection position between electrode assembly 3 and pin 4, reducing the accuracy of high-voltage test results and thus affecting battery production efficiency.

[0036] This application provides a single-cell battery, combined with Figures 2-14 The exhibit provides a detailed description of the single battery cell; to facilitate the description of the single battery cell in conjunction with the accompanying drawings, the width, length, and thickness directions of the cover plate assembly can be designated as the X, Y, and Z directions, respectively.

[0037] A single-cell battery includes a housing 1, a cover plate assembly 2, an electrode assembly 3, and pins 4. The cover plate assembly 2 is connected to the housing 1 and forms a cavity. The cover plate assembly 2 is provided with electrode terminals 201. The electrode assembly 3 is located in the cavity and includes a first electrode assembly 301 and a second electrode assembly 302 arranged side by side along the width direction of the cover plate assembly 2. One end of the pins 4 is connected to the electrode terminal 201, and the other end is connected to the first electrode assembly 301 and the second electrode assembly 302 respectively. The projection of the connection position of the pins 4 and the first electrode assembly 301 in the direction perpendicular to the length direction of the cover plate assembly 2 does not overlap with the projection of the connection position of the pins 4 and the second electrode assembly 302 in the direction perpendicular to the length direction of the cover plate assembly 2.

[0038] Specifically, such as Figure 2 As shown, Figure 2 This is a schematic diagram of a single battery cell described in an embodiment of this application, wherein the housing 1 is used to contain the electrolyte, as well as related components such as the pins 4 and the electrode assembly 3.

[0039] For example, the housing 1 may be made of aluminum or its alloys, which are strong and lightweight.

[0040] For example, the inner surface of the housing 1 may be coated with a chemically stable, insulating, and corrosion-resistant coating such as polyurethane or ceramic coating, which can extend the service life of the housing 1.

[0041] Specifically, such as Figure 2 As shown, the cover assembly 2 is connected to the housing 1 and forms a cavity. The cover assembly 2 can seal the cavity to create a good sealed environment inside the battery. The cover assembly 2 is provided with electrode terminals 201. Part of the electrode terminals 201 is exposed relative to the upper surface of the cover assembly 2 to provide a connection position for external devices. Part of the electrode terminals 201 extends into the cavity for connection with the pins 4.

[0042] Furthermore, the cover assembly 2 may be equipped with a rupture-proof component. When a single cell experiences thermal runaway, high-temperature and high-pressure gases and ejected materials can break through the rupture-proof component and be released into the environment, ensuring the safety of the battery.

[0043] Furthermore, the cover plate assembly 2 has an injection hole that penetrates through the cover plate assembly 2, which serves as an electrolyte injection channel for a single cell. Electrolyte can be injected into the cell through the injection hole.

[0044] Specifically, such as Figure 4 , Figure 5 , Figure 9 and Figure 10 As shown, Figure 4 This is a schematic diagram illustrating the connection between pin 4 and electrode assembly 3 in the first embodiment described in this application. Figure 5 This is an exploded view of the first type of pin 4 and electrode assembly 3 described in the embodiments of this application. Figure 10 This is a schematic diagram illustrating the connection between pin 4 and electrode assembly 3 in the second type described in this application embodiment. Figure 11 This is an exploded view of the second type of pin 4 and electrode assembly 3 described in the embodiments of this application. Pin 4 is connected to electrode terminals 201 of the same polarity, and is also connected within the cavity to tabs 303 of the same polarity as the first electrode assembly 301 and the second electrode assembly 302, respectively, so that the corresponding electrode terminals 201 and electrode assemblies 3 are electrically connected.

[0045] Furthermore, the electrode terminal 201 may include a positive terminal and a negative terminal, which are respectively connected to the electrode assembly 3 through corresponding pins 4.

[0046] Specifically, such as Figure 4 , Figure 5 , Figure 9 and Figure 10 As shown, the electrode assembly 3 includes a first electrode assembly 301 and a second electrode assembly 302. The first electrode assembly 301 and the second electrode assembly 302 are arranged and closely attached to each other in the cavity along the width direction of the cover plate assembly 2. The first electrode assembly 301 and the second electrode assembly 302 are respectively connected to the corresponding pins 4 through tabs 303 of the same polarity, so that the tabs 303 and the pins 4 form corresponding connection positions, thus constituting the internal circuit structure of the battery.

[0047] Furthermore, the first electrode assembly 301 and the second electrode assembly 302 are respectively connected to a pin 4 via tabs 303 of the same polarity. The tabs 303 include a positive tab 3031 and a negative tab 3032. Along the length of the cover plate assembly 2, the positive tab 3031 and the negative tab 3032 are respectively disposed on opposite sides of the electrode assembly 3.

[0048] Specifically, such as Figure 3 As shown, Figure 3 This is a schematic diagram illustrating the connection between the electrode assembly 3 and the two pins 4 as described in the embodiments of this application. The tab 303 can be formed by extending the current collector of the first electrode assembly 301 and the second electrode assembly 302; furthermore, each tab 303 includes a positive tab 3031 and a negative tab 3032. In the length direction of the cover plate assembly 2, the positive tab 3031 and the negative tab 3032 are disposed on opposite sides of the electrode assembly 3, which can keep the positive tab 3031 and the negative tab 3032 away from each other, and thus the pins 4 connected to the positive tab 3031 and the negative tab 3032 are also kept away from each other, ensuring the safety of the battery.

[0049] Furthermore, such as Figure 3 As shown, the positive electrode tab 3031 of the first electrode assembly 301 and the positive electrode tab 3031 of the second electrode assembly 302 are arranged on the same side, and the negative electrode tab 3032 of the second electrode assembly 302 and the negative electrode tab 3032 of the second electrode assembly 302 are arranged on the same side; by arranging the tabs 303 of the same polarity of the first electrode assembly 301 and the second electrode assembly 302 on the same side, the connection difficulty between the tab 303 and the pin 4 can be reduced.

[0050] Specifically, such as Figure 3 As shown, the single cell has two pins 4. The two pins 4 are the positive pin 401 connected to the positive electrode tab 3031 of the first electrode assembly 301 and the second electrode assembly 302, and the negative pin 402 connected to the negative electrode tab 3032 of the two.

[0051] Specifically, such as Figure 4 , Figure 5 , Figure 9 and Figure 10As shown, since the projections of the same polarity tabs 303 of the first electrode assembly 301 and the second electrode assembly 302 in the direction perpendicular to the length of the cover plate assembly 2 do not overlap, the connection positions of the same polarity tabs 303 of the first electrode assembly 301 and the second electrode assembly 302 with the pin 4 are staggered in the thickness direction of the cover plate assembly 2. In this way, the tabs 303 located on the same side of the electrode assembly 3 have sufficient extension space so that the same polarity tabs 303 of the first electrode assembly 301 and the second electrode assembly 302 avoid each other, thus avoiding the problem of tab 303 interference when the same side tabs 303 are connected to the same pin 4.

[0052] Furthermore, since the tabs 303 of the same polarity in the first electrode assembly 301 and the second electrode assembly 302 have ample extension space, there is no need to cut the ends of the tabs 303 when establishing an electrical connection between the tabs 303 and the pins 4. This simplifies the assembly process and reduces production costs. At the same time, eliminating the cutting process avoids the formation of cutting burrs, preventing self-discharge issues in the battery, ensuring the accuracy of high-voltage testing, and improving the production efficiency and yield of individual cells.

[0053] More specifically, when the connection positions of the first electrode assembly 301 and the second electrode assembly 302 with the pin 4 do not overlap in the direction perpendicular to the length of the cover plate assembly 2, no obvious protrusion will be formed at the connection position of the pin 4, ensuring that the assembly between the pin 4 and the housing 1 is not affected. If the connection positions of the tabs 303 of the same polarity overlap, the increased thickness of the overlapping area may cause localized poor soldering of the tabs 303 using the original welding process, affecting the reliability of the connection between the tabs 303 and the pin 4.

[0054] Furthermore, for the first electrode assembly 301 and the second electrode assembly 302, both can include multiple alternating layers of positive electrode sheets, negative electrode sheets, and a separator separating the two. The positive electrode sheets, negative electrode sheets, and separator can be wound roll structures or stacked sheet structures formed by sequential stacking.

[0055] In some embodiments, the positive electrode tab 3031 of the first electrode assembly 301 is closer to the bottom of the housing 1 than the positive electrode tab 3031 of the second electrode assembly 302, and the negative electrode tab 3032 of the first electrode assembly 301 is closer to the bottom of the housing 1 than the negative electrode tab 3032 of the second electrode assembly 302.

[0056] Specifically, such as Figure 3 , Figure 5 and Figure 10As shown, for electrode assembly 3, when the positive electrode tab 3031 of the first electrode assembly 301 is closer to the bottom of the housing 1 than the positive electrode tab 3031 of the second electrode assembly 302, and the negative electrode tab 3032 of the first electrode assembly 301 is closer to the bottom of the housing 1 than the negative electrode tab 3032 of the second electrode assembly 302, there is a height difference between the tabs 303 on the same side, forming a spatial misalignment. This allows the connection positions of different tabs 303 and pins 4 to be distributed sequentially in the thickness direction of the cover plate assembly 2. In this way, the tabs 303 on both sides of the first electrode assembly 301 and the tabs 303 on both sides of the second electrode assembly 302 have sufficient extension space, avoiding mutual interference when connected to pins 4.

[0057] Furthermore, the first electrode assembly 301 and the second electrode assembly 302 can be of the same specifications. During battery assembly, the second electrode assembly 302 can be rotated 180° along the centerline of the electrode assembly 3 (which is aligned with the length direction of the cover assembly 2) and then spliced ​​together with the second electrode assembly 302. In this way, the tabs 303 of the same polarity in the first electrode assembly 301 and the second electrode assembly 302 are staggered in the thickness direction of the cover assembly 2, preventing mutual interference when the tabs 303 of the same polarity are connected to the corresponding pins 4. In addition, assembling the electrode assembly 3 in this way can reduce the complexity of the manufacturing process and reduce the cost of the battery.

[0058] In some embodiments, the single battery cell has two pins 4, which can be a positive pin 401 and a negative pin 402, respectively. The positive electrode tab 3031 of the first electrode assembly 301 is bent and extends toward the second electrode assembly 302, and the positive electrode tab 3031 of the second electrode assembly 302 is bent and extends toward the first electrode assembly 301, and is connected to the positive pin 401, respectively. The negative electrode tab 3032 of the first electrode assembly 301 is bent and extends toward the second electrode assembly 302, and the negative electrode tab 3032 of the second electrode assembly 302 is bent and extends toward the first electrode assembly 301, and is connected to the negative pin 402, respectively.

[0059] Specifically, such as Figure 3As shown, for pin 4, the positive pin 401 is connected to the positive terminal and the positive tab 3031 of the electrode assembly 3, and the negative pin 402 is connected to the negative terminal and the negative tab 3032 of the electrode assembly 3. More specifically, when the positive tab 3031 and negative tab 3032 of the first electrode assembly 301 are bent and extend towards the second electrode assembly 302, and the positive tab 3031 and negative tab 3032 of the second electrode assembly 302 are bent and extend towards the first electrode assembly 301, that is, when the same tabs 303 of the first electrode assembly 301 and the second electrode assembly 302 are bent in opposite directions, not only can the tabs 303 of the same polarity be staggered, but also the overlap area between the tabs 303 and pin 4 can be ensured, the connection strength of the connection position between the tabs 303 and pin 4 can be ensured, and the reliability of the connection between the tabs 303 and pin 4 can be guaranteed.

[0060] In some embodiments, the projections of the positive electrode pin 401 and the negative electrode pin 402 in the direction perpendicular to the width of the cover plate assembly 2 are L-shaped, and each includes a first connecting portion 410 and a second connecting portion 420. The first connecting portion 410 is connected to the electrode terminal 201. The first connecting portion 410 extends from the central region of the cover plate assembly 2 to the edge of the cover plate assembly 2 between the cover plate assembly 2 and the electrode assembly 3. The second connecting portion 420 is connected to the first connecting portion 410. The second connecting portion 420 extends from the first connecting portion 410 to the bottom of the housing 1 between the housing 1 and the electrode assembly 3, and is connected to one of the positive electrode tab 3031 and the negative electrode tab 3032.

[0061] Specifically, such as Figure 4 , Figure 5 , Figure 10 and Figure 11 As shown, for the positive electrode pin 401 and the negative electrode pin 402, their projections in the direction perpendicular to the width of the cover plate assembly 2 are both L-shaped. Thus, when the first connecting part 410 of the pin 4 is placed between the cover plate assembly 2 and the electrode assembly 3, the electrode assembly 3 can be electrically connected to the electrode terminal 201 via the first connecting part 410. At the same time, by extending the first connecting part 410 from the center area to the edge in the length direction of the cover plate assembly 2, the space occupied can be reduced, so that a larger electrode assembly 3 can be used in the battery, which is beneficial to ensuring the battery capacity.

[0062] More specifically, such as Figure 4 , Figure 5 , Figure 10 and Figure 11As shown, the second connecting part 420 is disposed between the housing 1 and the electrode assembly 3 and is connected to the first connecting part 410, so that the electrode assembly 3 can be electrically connected to the electrode terminal 201 through the pin 4; in addition, by extending the second connecting part 420 from the first connecting part 410 to the bottom of the cavity along the thickness direction of the cover plate assembly 2, the space occupied by the second connecting part 420 can be reduced, so that a larger electrode assembly 3 can be used in the battery, thus ensuring the battery capacity.

[0063] In some embodiments, the positive electrode tab 3031 of the first electrode assembly 301 and the positive electrode tab 3031 of the second electrode assembly 302 are soldered to the second connection portion 420 of the positive electrode pin 401, and the negative electrode tab 3032 of the first electrode assembly 301 and the negative electrode tab 3032 of the second electrode assembly 302 are soldered to the second connection portion 420 of the negative electrode pin 402, and a first solder mark 601 is formed in the positive electrode tab 3031 and the negative electrode tab 3032.

[0064] Specifically, Figure 6 This is a schematic diagram illustrating the connection between the tab 303 and the second connecting portion 420 in Example 1 of the embodiments described in this application. Figure 7 This is a schematic diagram illustrating the connection between the tab 303 and the second connecting portion 420 in Example 2 of the embodiments described in this application. Figure 8 This is a schematic diagram illustrating the connection between the tab 303 and the second connecting portion 420 in Example 3 of the embodiments described in this application. Figure 9 This is a schematic diagram of the connection between the tab 303 and the second connecting part 420 in Example 4 of the embodiments described in this application.

[0065] Specifically, such as Figures 4-9 As shown, the positive electrode tabs 3031 of the first electrode assembly 301 and the second electrode assembly 302 are connected to the positive electrode pin 401, and the negative electrode tabs 3032 are connected to the negative electrode pin 402. Therefore, to ensure connection reliability, during battery assembly, the positive electrode tabs 3031 of the first electrode assembly 301 and the second electrode assembly 302 can be welded to the second connection portion 420 of the positive electrode pin 401 by a welding process, and the negative electrode tabs 3032 of both can be welded to the second connection portion 420 of the negative electrode pin 402, so as to ensure the connection strength of the connection position formed by the tabs 303 and the corresponding pins 4.

[0066] More specifically, when the tab 303 is soldered to the second connection portion 420 of the corresponding pin 4, the connection positions of the positive tab 3031 and the second connection portion 420 of the positive pin 401, and the connection positions of the negative tab 3032 and the second connection portion 420 of the negative pin 402, both form first solder marks 601, thus achieving electrical connection between the electrode assembly 3 and the pin 4. More specifically, since the tabs 303 of the same polarity in the first electrode assembly 301 and the second electrode assembly 302 are staggered along the thickness direction of the cover plate assembly 2, the tabs 303 of the same polarity are all firmly connected to the corresponding pin 4 through their respective first solder marks 601, thereby avoiding interference between the tabs 303 of the same polarity.

[0067] Furthermore, the first solder mark 601 can be divided into a first positive solder mark and a first negative solder mark; wherein, after the positive electrode tab 3031 is soldered to the positive electrode pin 401, a first positive solder mark can be formed at the corresponding connection position; after the negative electrode tab 3032 is soldered to the negative electrode pin 402, a first negative solder mark can be formed at the corresponding connection position.

[0068] The connection between the tab 303 on the same side of the first electrode assembly 301 and the second electrode assembly 302 and the second connection portion 420 of the corresponding pin 4 will be described in detail with reference to the following example.

[0069] like Figure 6 As shown in Example 1, the tabs 303 of the same polarity in the first electrode assembly 301 and the second electrode assembly 302 are welded to the second connection part 420 of the corresponding pin 4 through their respective first solder marks 601. When the ends of the first solder marks 601 in different tabs 303 on the same side of the electrode assembly 3 are connected to each other, continuous welding can be performed on the tabs 303 on the same side. This not only reduces the welding difficulty between the tabs 303 and the pin 4, but also shortens the welding cycle and improves the production efficiency of the battery.

[0070] like Figure 7 As shown in Example 2, the first electrode assembly 301 and the second electrode assembly 302 are connected to the second connection portion 420 of the corresponding pin 4 by their respective first solder marks 601. When the first solder marks 601 in the electrode 303 of the same polarity are distributed sequentially and staggered in the thickness direction of the cover plate assembly 2, each first solder mark 601 can be close to the end of the corresponding electrode 303, which can enhance the connection strength of the electrode 303 in the second connection portion 420, avoid the warping problem at the end of the electrode 303, and thus improve the stability of the electrode 303 and the corresponding pin 4.

[0071] like Figure 8As shown in Example 3, the first electrode assembly 301 and the second electrode assembly 302 are connected to the second connection part 420 of the corresponding pin 4 by their respective first solder marks 601. When the first solder marks 601 are provided in the first solder marks 303 of the same polarity, the first solder marks 601 in the different electrode 303 can correspond one-to-one and be connected to each other. This not only enhances the connection strength between the electrode 303 and the pin 4, but also facilitates the welding of electrode 303 of different polarities and reduces the welding difficulty.

[0072] like Figure 9 As shown in Example 3, the first electrode assembly 301 and the second electrode assembly 302 are both connected to the second connection part 420 of the corresponding pin 4 by their respective first solder marks 601. When the first solder marks 601 are provided in the first solder marks 601 of the first electrode assembly 301 and the second electrode assembly 302 respectively, the first solder marks 601 in the different electrode 303 located on the same side of the electrode assembly 3 are independent of each other, ensuring the connection strength between the electrode 303 and the corresponding pin 4.

[0073] Furthermore, the positive electrode tab 3031 and the second connection portion 420 of the positive electrode pin 401, and the negative electrode tab 3032 and the second connection portion 420 of the negative electrode pin 402 can be connected by laser welding to ensure good connection strength between the tab 303 and the pin 4, which will not be elaborated here.

[0074] Furthermore, using laser welding technology during welding can avoid the formation of spatter, reduce the probability of foreign matter generation, prevent the risk of abnormal K-values ​​due to the presence of foreign matter, and improve the overall performance and yield of individual cells. K-value refers to the voltage drop of a single cell per unit time, usually expressed in mV / d, and is an indicator used to measure the self-discharge rate of secondary batteries; it will not be elaborated further here.

[0075] In some embodiments, the first solder mark 601 is elongated and extends in the thickness direction of the cover plate assembly 2; for example... Figures 4-9 As shown, when the first solder mark 601 extends in the thickness direction of the cover plate assembly 2, there is a sufficient connection area between the tab 303 and the second connection part 420 of the pin 4 to ensure the connection strength between the two; setting the first solder mark 601 as a strip can also control the area of ​​the first solder mark 601, avoid the welding area being too large and generating too much heat, and prevent the tab 303 from being burned through.

[0076] In some embodiments, the first solder mark 601 in the positive electrode tab 3031 and the negative electrode tab 3032 is one; or the first solder mark 601 in at least one of the positive electrode tab 3031 and the negative electrode tab 3032 is at least two, and the at least two first solder marks 601 are arranged in parallel along the width direction of the cover plate assembly 2.

[0077] For example, such as Figure 6 and Figure 7 As shown, when the positive electrode tab 3031 or negative electrode tab 3032 of the first electrode assembly 301 and the second electrode assembly 302 are both soldered to the second connection portion 420 of the pin 4 through the first solder mark 601, the soldering cycle can be shortened and the assembly efficiency of the battery can be improved while ensuring the connection strength between the pin 4 and the tab 303.

[0078] For example, such as Figure 8 and Figure 9 As shown, when the positive electrode tab 3031 and / or negative electrode tab 3032 of the same polarity in the first electrode assembly 301 and the second electrode assembly 302 are provided with at least two first solder marks 601; for example, each tab 303 is provided with two first solder marks 601. By arranging the two first solder marks 601 in parallel in the width direction of the cover plate assembly 2, the uniformity of the first solder marks 601 in the tab 303 can be improved, and the connection effect between the pin 4 and the tab 303 can be improved. In addition, the parallel first solder marks 601 can reinforce the end of the tab 303, prevent the end of the tab 303 from warping and affecting the normal assembly of the electrode assembly 3, and prevent short circuit between the end of the tab 303 and the housing 1.

[0079] It should be noted that when multiple first solder marks 601 are used, the total welding area can be controlled by appropriately reducing the area of ​​a single first solder mark 601 in order to avoid heat accumulation caused by an excessively large welding area. This will not be elaborated further here.

[0080] In some embodiments, the second connecting portion 420 has a linear slot 5, the opening of the linear slot 5 is away from the cover plate assembly 2, and the second connecting portion 420 is divided into two sub-connecting portions 421.

[0081] Specifically, Figure 12 This is a schematic diagram illustrating the connection between the tab 303 and the sub-connector 421 in Example 5 of the embodiments described in this application. Figure 13 This is a schematic diagram of the connection between the tab 303 and the sub-connector 421 in Example Six, as described in the embodiments of this application. Figure 14 This is a schematic diagram of the connection between the tab 303 and the sub-connector 421 in Example 7 of the embodiments described in this application.

[0082] Specifically, such as Figure 10 and Figure 11As shown, the linear slot 5 formed in the second connection part 420 can, on the one hand, allow the pin 4 to be assembled and matched with the welding fixture, so as to achieve precise positioning and stable support of the pin 4, and facilitate the welding operation between the tab 303 and the pin 4; on the other hand, the linear slot 5 divides the second connection part 420 into two sub-connection parts 421, and the tab 303 is fixed to the surface of the corresponding sub-connection part 421 by welding, thereby realizing a reliable connection between the electrode assembly 3 and the pin 4.

[0083] In some embodiments, the positive electrode tab 3031 of the first electrode assembly 301 and the positive electrode tab 3031 of the second electrode assembly 302 are soldered to at least one of the two sub-connection portions 421 of the positive electrode pin 401, and the negative electrode tab 3032 of the first electrode assembly 301 and the negative electrode tab 3032 of the second electrode assembly 302 are soldered to at least one of the two sub-connection portions 421 of the negative electrode pin 402, and a second solder mark 602 is formed in the positive electrode tab 3031 and the negative electrode tab 3032.

[0084] Specifically, such as Figures 10-14 As shown, the positive electrode tabs 3031 of the first electrode assembly 301 and the second electrode assembly 302 are connected to the positive electrode pin 401, and the negative electrode tabs 3032 are connected to the negative electrode pin 402. Therefore, during the battery assembly process, the positive electrode tabs 3031 of the first electrode assembly 301 and the second electrode assembly 302 can be welded to at least one of the two sub-connecting portions 421 of the second connecting portion 420 in the positive electrode pin 401 through a welding process, and the negative electrode tabs 3032 of the two can be welded to at least one of the two sub-connecting portions 421 of the second connecting portion 420 in the negative electrode pin 402, so as to ensure the connection strength between the tabs 303 and the corresponding pins 4.

[0085] More specifically, when the tab 303 is soldered to the sub-connection portion 421 of the second connection portion 420 in the corresponding pin 4, a second solder mark 602 can be formed between the positive tab 3031 and the sub-connection portion 421 of the positive pin 401, and between the negative tab 3032 and the sub-connection portion 421 of the negative pin 402, so that the electrode assembly 3 and the pin 4 can establish an electrical connection. More specifically, since the tabs 303 of the same polarity of the first electrode assembly 301 and the second electrode assembly 302 are staggered along the thickness direction of the cover plate assembly 2, the tabs 303 of the same polarity can be stably connected to the sub-connection portion 421 of the corresponding pin 4 through their respective second solder marks 602, thus avoiding the problem of mutual interference between the tabs 303 of the same polarity.

[0086] like Figure 12As shown in Example 5, the tabs 303 of the same polarity in the first electrode assembly 301 and the second electrode assembly 302 are welded to the sub-connection portion 421 of the corresponding pin 4 through their respective second solder marks 602. When the ends of the second solder marks 602 in the tabs 303 of the same polarity are connected to each other, continuous welding can be carried out on the tabs 303 on the same side during the welding process. This not only reduces the welding difficulty between the tabs 303 and the pin 4, but also shortens the welding cycle, thereby improving the production efficiency of the battery.

[0087] like Figure 13 As shown in Example 6, the first electrode assembly 301 and the second electrode assembly 302 are connected to the corresponding pin 4 via their respective second solder marks 602. When the second solder marks 602 in the electrode 303 of the same polarity are distributed sequentially and staggered in the thickness direction of the cover plate assembly 2, each second solder mark 602 can be close to the end of the corresponding electrode 303, which can enhance the connection strength of the electrode 303 in the sub-connection part 421, avoid the warping problem at the end of the electrode 303, and thus improve the stability of the electrode 303 and the corresponding pin 4.

[0088] like Figure 14 As shown in Example 7, the first electrode assembly 301 and the second electrode assembly 302 are connected to the corresponding pin 4 sub-connection portion 421 by their respective second solder marks 602. When the two electrodes 303 of the same polarity are provided with two second solder marks 602, the second solder marks 602 in different electrodes 303 can correspond one-to-one and be connected to each other. This not only enhances the connection strength between the electrodes 303 and the pin 4, but also facilitates the welding of electrodes 303 of different polarities and reduces the welding difficulty.

[0089] Furthermore, the tab 303 and the sub-connection portion 421 of the second connection portion 420 in the corresponding pin 4 can be connected by laser welding to ensure good connection strength between the tab 303 and the pin 4, which will not be elaborated here.

[0090] Furthermore, the second solder mark 602 can be divided into a second positive solder mark and a second negative solder mark; wherein, after the positive electrode tab 3031 is soldered to the sub-connection portion 421 of the positive electrode pin 401, a second positive solder mark can be formed at the corresponding connection position; after the negative electrode tab 3032 is soldered to the negative electrode pin 402, a second negative solder mark can be formed at the corresponding connection position.

[0091] It should be noted that some embodiments of this application have been described above. Other embodiments are within the scope of the appended claims.

[0092] The various embodiments in this application are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0093] The description in this application is given for illustrative purposes and is not intended to be exhaustive or to limit the application to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described to better illustrate the principles and practical application of this application and to enable those skilled in the art to understand this application and design various embodiments with various modifications suitable for a particular purpose.

[0094] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of this application (including the claims) is limited to these examples; within the framework of this application, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of the embodiments of this application as described above, which are not provided in the details for the sake of brevity.

[0095] Although this application has been described in conjunction with specific embodiments thereof, many substitutions, modifications and variations of these embodiments will be apparent to those skilled in the art from the foregoing description.

[0096] The embodiments of this application are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the embodiments of this application should be included within the protection scope of this application.

Claims

1. A single-cell battery, characterized in that, include: case; A cover plate assembly is connected to the housing and surrounds it to form a cavity; the cover plate assembly is provided with electrode terminals; An electrode assembly, located within the cavity, includes a first electrode assembly and a second electrode assembly arranged side-by-side along the width direction of the cover plate assembly; The pin has one end connected to the electrode terminal and the other end connected to the first electrode assembly and the second electrode assembly respectively; the projection of the connection position of the pin and the first electrode assembly perpendicular to the length direction of the cover plate assembly does not overlap with the projection of the connection position of the pin and the second electrode assembly perpendicular to the length direction of the cover plate assembly.

2. The single-cell battery according to claim 1, characterized in that, The first electrode assembly and the second electrode assembly are respectively connected to a pin via tabs of the same polarity, wherein the tabs include a positive tab and a negative tab. Along the length of the cover plate assembly, the positive electrode tab and the negative electrode tab are respectively disposed on opposite sides of the electrode assembly; The positive electrode tabs of the first electrode assembly and the second electrode assembly are disposed on the same side, and the negative electrode tabs of the second electrode assembly are disposed on the same side.

3. The single-cell battery according to claim 2, characterized in that, The positive electrode tab of the first electrode assembly is closer to the bottom of the housing than the positive electrode tab of the second electrode assembly. The negative electrode tab of the first electrode assembly is closer to the bottom of the housing than the negative electrode tab of the second electrode assembly.

4. The single-cell battery according to claim 3, characterized in that, The device has two pins, which are a positive pin and a negative pin, respectively. The positive electrode tab of the first electrode assembly is bent and extends toward the second electrode assembly, and the positive electrode tab of the second electrode assembly is bent and extends toward the first electrode assembly, and is respectively connected to the positive electrode pin; The negative electrode tab of the first electrode assembly is bent and extends toward the second electrode assembly, and the negative electrode tab of the second electrode assembly is bent and extends toward the first electrode assembly, and is respectively connected to the negative electrode pin.

5. The single-cell battery according to claim 4, characterized in that, The projections of the positive and negative pins in the direction perpendicular to the width of the cover plate assembly are L-shaped, and each includes a first connecting portion and a second connecting portion. The first connecting portion is connected to the electrode terminal; the first connecting portion extends from the central region of the cover plate assembly to the edge of the cover plate assembly between the cover plate assembly and the electrode assembly; The second connecting part is connected to the first connecting part; the second connecting part extends from the first connecting part to the bottom of the housing between the housing and the electrode assembly, and is connected to the tab of the same polarity.

6. The single-cell battery according to claim 5, characterized in that, The positive electrode tabs of the first electrode assembly and the second electrode assembly are soldered to the second connection portion of the positive electrode pin, and the negative electrode tabs of the first electrode assembly and the second electrode assembly are soldered to the second connection portion of the negative electrode pin, and a first solder mark is formed in the positive electrode tab and the negative electrode tab.

7. The single-cell battery according to claim 6, characterized in that, The first solder mark is elongated and extends along the thickness direction of the cover plate assembly.

8. The single-cell battery according to claim 7, characterized in that, The first solder mark within the positive electrode tab and the negative electrode tab is one; or... The first solder mark in at least one of the positive electrode tab and the negative electrode tab is at least two, and the at least two first solder marks are arranged in parallel along the width direction of the cover plate assembly.

9. The single-cell battery according to claim 5, characterized in that, The second connecting portion has a linear slot, the opening of which is opposite to the cover plate assembly, and divides the second connecting portion into two sub-connecting portions.

10. The single-cell battery according to claim 9, characterized in that, The positive electrode tab of the first electrode assembly and the positive electrode tab of the second electrode assembly are soldered to at least one of the two sub-connection portions of the positive electrode pin, and the negative electrode tab of the first electrode assembly and the negative electrode tab of the second electrode assembly are soldered to at least one of the two sub-connection portions of the negative electrode pin, and a second solder mark is formed in the positive electrode tab and the negative electrode tab.

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