Connector design method, connector, energy storage device, and power-using equipment

Abstract

The present invention provides a connector design method, a connector, an energy storage device, and a power consumption equipment. The connector design method includes the following: An area S of a welding area to be connected to a tab in a connector is obtained. The connector is divided into a first effective area and a second effective area. The first effective area is an area of ​​the connector having a regular shape, and the second effective area is an area of ​​the connector to be connected to a pole, and there are N first effective areas, N≧1, and the first effective areas are connected to the same side of the second effective area. The specification dimensions of the first effective area are determined based on S=aS1, a being in the range of 0.095-0.96. S1 is the area of ​​the first effective area. In this way, the size of the welding area to be connected to the tab in the connector meets the overcurrent requirement, and the specification dimensions of the first effective area are more reasonable, which avoids unnecessary design and reduces the number of verifications in the design process, and the specification dimensions of the connector with a predetermined type are reasonable, which reduces the verification cost.

Description

[Technical field]

[0001] REFERENCE TO RELATED APPLICATIONS This application claims priority to China Patent Application No. 202211391375.6, filed on November 8, 2022, entitled "Connector design method, connector, energy storage device and power consumption equipment," the entire contents of which are incorporated herein by reference.

[0002] The present invention relates to the field of connector technology, and in particular to a connector design method, a connector, an energy storage device, and an electric power-using equipment. [Background technology]

[0003] The connector, which is a metal conductor that draws the current of the bare cell, has one end connected to the tab of the bare cell and the other end connected to the terminal post. In the prior art, the geometric dimensions of the soft connection area of ​​the connector need to be verified multiple times to avoid insufficient overcurrent capacity or excessive design, and the verification costs are high due to the large number of verifications. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems in the prior art. Therefore, one of the aims of the present invention is to provide a connector design method that can reduce the frequency of experiments in the connector design process and reduce verification costs.

[0005] The present invention further provides a connector based on the above design method.

[0006] The present invention further provides an energy storage device using the above connector.

[0007] The present invention further provides an electric power consumption facility using the above energy storage device.

[0008] A connector design method according to an embodiment of the first aspect of the present invention includes the following: An area S of a welding region in the connector for connection with a tab is obtained. The connector is divided into a first effective region and a second effective region. The first effective region is a region in the connector having a regular shape, and the second effective region is a region in the connector that is connected with a pole, and there are N first effective regions (10), N≧1, and the multiple first effective regions (10) are connected to the same side of the second effective region (20). A specification dimension of the first effective region is determined based on S=aS1, where a is within a range of 0.095 to 0.96. S1 is the area of ​​the first effective region.

[0009] According to the connector design method of the embodiment of the present invention, the connector is divided into two regions, and the specification dimension of the first effective region is set according to S=aS1. The size of the welded region connected with the tab in the connector meets the overcurrent requirement, and the specification dimension of the first effective region is more reasonable, which can avoid unnecessary design, reduce the number of verifications in the design process, and reduce the verification cost. The reasonable specification dimensions of the connector with a certain type can reduce the production cost, meet the temperature rise requirement of the weld mark, and ensure the service life.

[0010] In some embodiments, obtaining the area S of the welded region of the connector to be connected with the tab specifically refers to continuously applying an overcurrent to the tab and obtaining the area when the temperature rise is less than a set threshold, so that the area of ​​the welded region meets the overcurrent requirement and improves the connection stability between the connector and the tab.

[0011] Furthermore, determining the specification dimensions of the first effective area specifically means, when the welding area is rectangular, determining the length and width of the first effective area by representing the length of the first effective area as x1, the width of the welding area as y1, the length of the welding area as x2, and the width of the welding area as y2, where x1=mx2, y1=ny2, a=mn, m is in the range of 0.1 to 0.95, and n is in the range of 0.1 to 0.95.

[0012] Furthermore, determining the specification dimensions of the first effective area specifically means that when the welding area is circular, the width of the first effective area is represented by y1, the radius of the welding area is represented by r1, and the length and width of the first effective area are determined by r1≦0.95y1.

[0013] Furthermore, determining the specification dimensions of the first effective area specifically means that when the welding area is elliptical, the vertical axis of the welding area is parallel to the width direction of the first effective area, the length of the vertical axis of the welding area is represented by L1, the width of the first effective area is represented by y1, and the length and width of the first effective area are determined by L1:y1=(0.2~0.95):1.

[0014] Furthermore, the distance between adjacent first effective areas is represented by wl, the width of a first effective area is represented by w2, and the width of a second effective area is w3=w1+Nw2, where N is the number of first effective areas.

[0015] A connector according to an embodiment of the second aspect of the present invention is used for a battery including a tab and a pole. The connector connects the tab and the pole, and the connector includes N first effective areas and a second effective area. N≧1, and the first effective area is provided with a welding area for connecting with the tab. The second effective area is in contact with the first effective area, and the first effective areas are located on the same side of the second effective area. The area S of the welding area and the area S1 of the first effective area satisfy S=aS1, where a is in the range of 0.095 to 0.96. In the process of completing a predetermined number of charge / discharge cycles of the battery, the temperature rise of the welding mark during charging and discharging of the welding area is less than a temperature rise threshold, the capacity maintenance rate is 85% or more, the temperature rise threshold is 10° C. or less, and the predetermined number of cycles is [0, 1500]. Furthermore, the preset number of cycles is [0, 1000], and the capacity maintenance rate is 90% or more.

[0016] In some embodiments, when the welding area is rectangular, the length of the first effective area is represented by x1 and the width is represented by y1, the length of the welding area is represented by x2 and the width is represented by y2, where x1=mx2, y1=ny2, a=mn, m is in the range of 0.1 to 0.95, and n is in the range of 0.1 to 0.95.

[0017] Furthermore, when the welded area is circular, the width of the first effective area is represented by y1, the radius of the welded area is represented by r1, and y1 and r1 satisfy r1≦0.95y1.

[0018] Furthermore, when the welded area is elliptical, the longitudinal axis of the welded area is parallel to the width direction of the first effective area, and the ratio of the length L1 of the longitudinal axis to the width y1 of the first effective area is (0.2-0.95):1.

[0019] An energy storage device according to an embodiment of the third aspect of the present invention includes an end cover and a connector, the end cover having a pole thereon for connection with the connector.

[0020] An electric power consumption facility according to an embodiment of the fourth aspect of the present invention includes the above-described energy storage device.

[0021] Additional aspects and advantages of the invention will be set forth in part in the description that follows, and in part will be obvious from the description, or may be learned by practice of the invention. [Brief description of the drawings]

[0022] The above and / or additional aspects and advantages of the present invention will become apparent and will be more easily understood from the following detailed description of the embodiments with reference to the drawings. [Figure 1] FIG. 1 is a schematic diagram showing one connector according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a schematic diagram showing another connector according to an embodiment of the present invention. [Diagram 3] FIG. 3 is a flowchart of a design method according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0023] Hereinafter, the embodiments of the present invention will be described in detail. Examples of the embodiments are shown in the drawings. The same or similar symbols indicate the same or similar elements throughout, or elements having the same or similar functions. The embodiments described below with reference to the drawings are illustrative and are used only to explain the present invention, and should not be understood as limiting the present invention.

[0024] Hereinafter, a design method for a connector 100, the connector 100, an energy storage device, and power consumption equipment according to an embodiment of the present invention will be described with reference to FIGS.

[0025] As shown in Fig. 1, Fig. 2 and Fig. 3, the design method of the connector 100 according to the embodiment of the first aspect of the present invention includes the following: The area S of the welding area 11 for connecting with the tab in the connector 100 is obtained. The connector 100 is divided into a first effective area 10 and a second effective area 20. The first effective area 10 is an area having a regular shape in the connector 100, and the second effective area 20 is an area in the connector 100 that is connected with the pole, and there are N first effective areas 10, N≧1, and the multiple first effective areas 10 are connected to the same side of the second effective area 20. The specification dimension of the first effective area 10 is determined based on S=aS1, where a is in the range of 0.095 to 0.96. S1 is the area of ​​the first effective area 10.

[0026] Specifically, the connector 100 is configured to electrically connect the tab and the pole of the bare cell. The connector 100 is welded to the tab, and the size of the welded area 11 is related to the overcurrent capacity. In the design method of the present invention, first, the area S of the welded area 11 in the connector 100 for connection with the tab is obtained. Furthermore, the connector 100 is divided into two effective areas. The first effective area 10 has a regular shape (e.g., rectangular, square, etc.), which is advantageous for connecting the connector 100 and the tab. The second effective area 20 needs to be rationally designed based on the shape of the pole, and the specific shape is not specifically limited in the present invention.

[0027] It should be noted that there may be one (see FIG. 1) or multiple (see FIG. 2) first effective areas 10 according to the design needs of the connector 100. In an embodiment having multiple first effective areas 10, the first effective areas 10 are provided on the same side of the second effective area 20, which is advantageous for each of the multiple first effective areas 10 to be connected to the corresponding tab, and is also advantageous for arrangement, and interference of the second effective area 20 during the process of connecting the tab and the first effective area 10 can be avoided.

[0028] As can be understood, the area of ​​the effective area and the area S1 of the welding area 11 are limited to satisfy S=aS1, and based on this proportional relationship, the specification dimensions of the first effective area 10 can be determined, and the design of the connector 100 can be further completed.

[0029] The manufacturing process of a lithium-ion battery is as follows: A positive electrode sheet, a separator, and a negative electrode sheet are placed in order, with the separator positioned between the positive electrode sheet and the negative electrode sheet to act as an insulator. They are then rolled up to obtain a bare cell. The positive electrode tab of the bare cell is welded to the positive electrode connection sheet, and the negative electrode tab of the bare cell is welded to the negative electrode connection sheet. The welded bare cell is then placed in a case, dried, and electrolyte is injected through the injection hole in the end cover, and the battery is sealed, left to stand, and formed to obtain a lithium-ion battery.

[0030] Example 1: A 280Ah lithium-ion battery is manufactured, and the area S of the welding area 11 is 5mm*12mm, preferably a=0.81, m=0.9, n=0.9, that is, the length of the first effective area is 10.8mm, the width of the first effective area is 4.5mm, and the area S1 of the first effective area 10 is 48.6mm.

[0031] Example 2: A 280Ah lithium ion battery is manufactured, with S=5mm*12mm, preferably a=0.81, m=0.95, n=0.842.

[0032] Example 3: A 280Ah lithium ion battery is manufactured, with S=5mm*12mm, preferably a=0.81, m=0.842, n=0.95.

[0033] Example 4: A 280Ah lithium ion battery is manufactured, S=5mm*12mm, preferably a=0.49, m=0.7, n=0.7.

[0034] Example 5: A 280Ah lithium ion battery is manufactured, with S=5mm*12mm, preferably a=0.25, m=0.5, n=0.5.

[0035] Example 6: A 280Ah lithium ion battery is manufactured, with S=5mm*12mm, preferably a=0.09, m=0.3, n=0.3.

[0036] Comparative Example 1: A 280Ah lithium-ion battery is manufactured, with S=5mm*12mm, a=1, m=1, and n=1.

[0037] Comparative Example 2: A 280Ah lithium-ion battery is manufactured, with S=5mm*12mm, a=0.01, m=0.1, and n=0.1.

[0038] Comparative Example 3: A 280Ah lithium-ion battery is manufactured, with S=5mm*12mm, a=0.97, m=0.985, and n=0.985.

[0039] [Table 1]

[0040] The following can be seen from Table 1. Comparative Example 1 is a conventional technical solution. The area of ​​the weld mark is consistent with the area of ​​the first effective area 10, and the cost is low, but the requirements for overcurrent and temperature rise at the weld mark cannot be met. Comparative Example 2 is a conventional improvement plan. The requirements for overcurrent and temperature rise at the weld mark can be met, but the cost is obviously increased. Comparative Example 3 is another conventional improvement plan. The cost is low, but the rate of welding misalignment is high. Analyzing the design method of the present invention (Examples 1 to 6), by setting S=aS1, a within the range of 0.095 to 0.96, the connector 100 meets the requirements for overcurrent and temperature rise at the weld mark, the safety of use is improved, and the soft connection cost is significantly reduced compared to Comparative Example 2.

[0041] The difficulty of assembly can be determined by the production rhythm, and if the assembly is difficult, the production rhythm is slow and the production efficiency is low. An easy assembly difficulty indicates a production efficiency higher than 20 ppm, where ppm is (pieces / minute) pcs / min. A medium assembly difficulty indicates a production efficiency of 10-20 ppm. A difficult assembly difficulty indicates a production efficiency of 0-10 ppm. When the area of ​​the welded area that is actually welded to the tab is smaller than the area S of the weld mark, it is recorded as a weld misalignment, and the ratio of the number of connectors 100 in which the weld misalignment occurred to the total number of production is the weld misalignment rate. The temperature rise of the weld mark during charging and discharging means the difference between the maximum temperature of the welded area and the reference temperature in the process of the battery performing one charge and discharge cycle, with 25°C as the reference. The soft connection cost is the material cost of one connector 100. Meeting the overcurrent requirement is defined as the maximum temperature of the welded area being 10°C or less in one charge and discharge cycle of the battery. The derivation process is as follows. The welded area represents the overcurrent area, and the larger the overcurrent area, the better the current conducting ability. If the welded area 11 of the connector 100 is too small, the internal resistance of the connector 100 will increase, resulting in a drop in the voltage of the battery cycle and affecting the utilization of the battery capacity. Also, if the welded area of ​​the connector 100 is too small, the temperature inside the battery will be abnormal, which will lead to an increase in side reactions inside the lithium-ion battery system, leading to the consumption of active materials in the battery and the decay of the battery.

[0042] [Table 2]

[0043] From Table 2, the following can be seen. If the temperature rise of the weld mark does not change, as the number of charge / discharge cycles increases, the battery will gradually wear out and the capacity retention rate will gradually decrease. For the same number of charge / discharge cycles, when the temperature rise of the weld mark exceeds the temperature threshold of 10°C and the number of cycles is 100 or more, the capacity retention rate will be significantly lower than the capacity retention rate when the temperature rise of the weld mark does not exceed the temperature threshold. According to the present invention, by ensuring that the temperature rise of the weld mark of the connector 100 is less than the temperature threshold, the capacity retention rate of the corresponding battery can be stabilized, and the service life of the battery using the connector 100 of the present invention can be effectively extended.

[0044] According to the design method of the connector 100 of the embodiment of the present invention, the connector 100 is divided into two regions, and the specification dimension of the first effective region 10 is set according to S=aS1. By making the size of the welding region 11 connected with the tab in the connector 100 satisfy the overcurrent requirement and making the specification dimension of the first effective region 10 more reasonable, it is possible to avoid unnecessary design, reduce the number of verifications in the design process, and reduce the verification cost. The reasonable specification dimension of the type-defined connector 100 can reduce the production cost, meet the temperature rise requirement of the weld mark, and ensure the service life.

[0045] Obtaining the area S of the welding region 11 in the connector 100 for connection with the tab specifically means applying an overcurrent continuously to the tab and obtaining the area when the temperature rise is smaller than a set threshold value.

[0046] For example, if the maximum allowable current value of the bare cell is set to 10A and the maximum allowable temperature rise ΔT is set to 180°C, the process of obtaining the area S of the welding area 11 for connection with the tab in the connector 100 is as follows: A current of 10A is applied to the tab, and the temperature change of the welding area 11 is measured. When a large current of 10A is continuously applied and the temperature rise is smaller than ΔT, the area of ​​the connection area between the tab and the connector 100 is the area of ​​the welding area 11 obtained in the present invention. In this way, the area of ​​the welding area 11 can meet the overcurrent requirement, and when an overcurrent is continuously applied, the temperature change is below the set threshold, thereby avoiding the disconnection of the connector 100 and the tab, and improving the stability of the connection between the connector 100 and the tab.

[0047] It can be understood that the area of ​​the weld area 11 is the area of ​​the connection area between the tab and the connector 100, and the shape of the weld area 11 can be rectangular, circular or elliptical.

[0048] in particular, 1. When the welding area 11 is rectangular, the specification dimensions of the first effective area 10 are specifically determined as follows: The length of the first effective area 10 is represented by x1, the width by y1, and the length of the welding area 11 is represented by x2, the width by y2. The length and width of the first effective area 10 are determined by x1=mx2, y1=ny2, a=mn, where m is in the range of 0.1 to 0.95 and n is in the range of 0.1 to 0.95.

[0049] 2. When the welding area 11 is circular, the specification dimensions of the first effective area 10 are specifically determined as follows: The width of the first effective area 10 is represented by y1, and the radius of the welding area 11 is represented by r1. The length and width of the first effective area 10 are determined according to r1≦0.95y1.

[0050] 3. When the welding area 11 is elliptical, the specification dimensions of the first effective area 10 are specifically determined as follows: The vertical axis of the welding area 11 is parallel to the width direction of the first effective area 10, the length of the vertical axis of the welding area 11 is represented by L1, and the width of the first effective area 10 is represented by y1. The length and width of the first effective area 10 are determined according to L1:y1=(0.2~0.95):1.

[0051] To summarize the above, the following can be seen. Depending on the different shapes of the welding area 11, there are some differences in determining the specification dimensions of the first effective area 10. When the welding area 11 is rectangular, the length of the first effective area 10 is limited according to the length of the welding area 11, and the width of the first effective area 10 is limited according to the width of the welding area 11, based on the proportional relationship. When the welding area 11 is circular, it is necessary that at least the maximum diameter of the welding area 11 is smaller than the width of the first effective area 10. When the welding area 11 is elliptical, the longitudinal axis of the welding area 11 and the width of the first effective area 10 are parallel to each other, and are limited to meet the proportional relationship. In this way, the area of ​​the welding area 11 and the area of ​​the first effective area 10 can be ensured to meet the proportional relationship requirement, and the periphery of the welding area 11 and the periphery of the first effective area 10 can be spaced apart to improve the stability and safety of welding and avoid damage to surrounding parts during welding.

[0052] 1 and 2, the distance between adjacent first effective areas 10 is represented by wl, the width of the first effective areas 10 is represented by w2, and the width of the second effective area 20 is w3=w1+Nw2. When there is one first effective area 10, the center of the first effective area 10 and the center of the second effective area 20 are coaxial, and the width of the second effective area 20 is w3=w1+w2.

[0053] The number of the first effective areas 10 corresponds to the number of the wound cells. When there are multiple wound cells, multiple first effective areas 10 are provided correspondingly. Each first effective area 10 corresponds to one wound cell, so that the connection between the multiple wound cells and the connector 100 can be more stable and reliable, and multiple wound cells are connected to the connector 100 on the same side of the connector 100, so that the assembly efficiency can be improved and the interference of the second effective area 20 can be avoided.

[0054] As shown in Fig. 1 and Fig. 2, a connector 100 according to an embodiment of the second aspect of the present invention is used for a battery including a tab and a pole. The connector 100 connects the tab and the pole, and includes N first effective areas 10 and a second effective area 20. N ≥ 1, and the first effective area 10 is provided with a welding area 11 for connecting with the tab. The second effective area 20 is in contact with the first effective area 10, and the first effective areas 10 are located on the same side of the second effective area 20. The area S of the welding area 11 and the area S1 of the first effective area 10 satisfy S = aS1, where a is in the range of 0.095 to 0.96.

[0055] In the process of completing a predetermined number of charge / discharge cycles for the battery, the temperature rise of the welding mark during charging / discharging of the welding region 11 is less than a temperature rise threshold, the capacity retention rate is 85% or more, the temperature rise threshold is 10°C or less, and the predetermined number of cycles is [0, 1500].

[0056] In other words, in the connector 100 designed using the above design method in the embodiment of the present invention, the temperature rise of the weld mark is always less than the temperature rise threshold of 10°C. Referring to the embodiments in Table 2 in which the temperature rise of the weld mark is 3°C, 5°C, 8°C, and 10°C, it can be seen that in the 0-1500 cycle charge-discharge process, even after 1500 charge-discharge cycles, the capacity retention rate of the battery can be 86.3% or more. This makes the capacity retention rate of the battery more stable, and can effectively extend the life of the battery.

[0057] By positioning the multiple first effective areas 10 on the same side of the second effective area 20, welding each of the multiple first effective areas 10 to the corresponding tab is simpler and more convenient, and interference with the second effective area 20 can be avoided.

[0058] The connector 100 according to the embodiment of the present invention is obtained by using the above design method of the present invention, and the area of ​​the first effective area 10 is more reasonable. Under the premise of meeting the overcurrent requirements and improving the safety and reliability of use, the unnecessary design of the first effective area 10 can be avoided. By using more reasonable materials, the production cost of the connector 100 can be reduced and the service life of the battery using the connector 100 of the present invention can be extended.

[0059] Furthermore, the preset number of cycles is [0, 1000], and the capacity retention rate is 90% or more.

[0060] Specifically, according to the connector 100 of the embodiment of the present invention, even if the number of charge and discharge cycles reaches 1,000, the capacity retention rate of the battery still exceeds 90%, which reduces the rate of decay of the battery's electrical charge and extends the service life.

[0061] In some embodiments, when the welding area 11 is rectangular, the length of the first effective area 10 is represented by x1, the width is represented by y1, the length of the welding area 11 is represented by x2, the width is represented by y2, where x1=mx2, y1=ny2, a=mn, m is in the range of 0.1-0.95, and n is in the range of 0.1-0.95. In some other embodiments, when the welding area 11 is circular, the width of the first effective area 10 is represented by y1, the radius of the welding area 11 is represented by r1, and y1 and r1 satisfy r1≦0.95y1. In still another embodiment, when the welding area 11 is elliptical, the longitudinal axis of the welding area 11 is parallel to the width direction of the first effective area 10, and the ratio of the longitudinal axis length L1 to the width y1 of the first effective area 10 is (0.2-0.95):1.

[0062] In other words, the welding area 11 may be rectangular, circular or elliptical. When the welding area 11 is formed into a different shape, by limiting the length and width dimensions of the first effective area 10 based on the above proportional relationship, the dimensions of the first effective area 10 can be more reasonable, reducing costs, and ensuring that the welding mark is in the first effective area 10 during welding, thereby avoiding damage to surrounding components during welding, and improving the reliability and safety of the welding process between the connector 100 and the tab, and the connector 100 and the pole.

[0063] For example, referring to Examples 1 to 6, the temperature rise threshold in the embodiments of the present invention is 10°C, and the area S of the welding area 11 and the area S1 of the first effective area 10 satisfy S = aS1, where a is in the range of 0.095 to 0.96, and the temperature rise of the welding mark during charging and discharging is less than 10°C. Thus, the connector 100 according to the embodiments of the present invention can meet the overcurrent requirements and have higher usage safety.

[0064] The energy storage device according to the embodiment of the present invention includes a housing, an end cover provided to cover the housing, and the connector. A pole connected to the connector is provided on the end cover.

[0065] That is, a pole core is provided within the housing, an end cover is provided to cover the housing, and the pole core is electrically connected to the pole post via a connector.

[0066] The energy storage device according to the embodiment of the present invention uses the above connector, which can reduce the production cost of the energy storage device and improve the safety of use.

[0067] The present invention further provides an electric power-using facility, which includes the above-mentioned energy storage device and achieves the same technical effects, which will not be repeated here.

[0068] In the description of the present invention, the orientation or positional relationship indicated by terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., is based on the orientation or positional relationship shown in the drawings. It is merely for the purpose of explaining the present invention and simplifying the description, and is not intended to indicate or imply that the indicated devices or elements necessarily have a specific orientation, are constructed or operate in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0069] In the description of the present invention, a "first feature" or a "second feature" may include one or more of the said features.

[0070] In the present description, "plurality" means two or more.

[0071] In describing the present invention, a first feature being "above" or "below" a second feature can include the first and second features being in direct contact, and can also include the first and second features not being in direct contact, but being in contact via another feature between them.

[0072] For purposes of this invention, a first feature being "above" a second feature includes the first feature being directly above and diagonally above the second feature, or simply indicating that the horizontal height of the first feature is greater than the horizontal height of the second feature.

[0073] In the present description, the description of a reference term such as "one embodiment," "several embodiments," "exemplary embodiments," "examples," "particular examples," or "several examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In the present description, the exemplary descriptions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined as appropriate in any one or more embodiments or examples.

[0074] Although embodiments of the present invention have been shown and described above, it will be understood by those skilled in the art that various modifications, alterations, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and that the scope of the present application is limited by the claims and their equivalents. [Explanation of symbols]

[0075] 100…Connector 10…First effective area 11…Welding area 20…Second effective area

Claims

1. A method for designing a connector, comprising the steps of: Obtaining an area S of a welding area (11) in the connector for connection with a tab; Dividing the connector into a first effective area (10) and a second effective area (20), the first effective area (10) being an area of ​​the connector having a regular shape, the second effective area (20) being an area of ​​the connector that is connected to a pole, there being N first effective areas (10), N≧1, and the first effective areas (10) are connected to the same side of the second effective area (20); determining a specification dimension of the first effective area (10) based on S=aS1, where a is in the range of 0.095 to 0.96; and determining that S1 is the area of ​​the first effective area (10). A connector design method comprising:

2. Specifically, obtaining the area S of the welding region (11) in the connector for connection with the tab is performed by continuously applying an overcurrent to the tab and obtaining an area when a temperature rise is smaller than a set threshold value.

2. The connector design method according to claim 1 .

3. Specifically, determining the specification dimensions of the first effective area (10) includes: When the welding area (11) is rectangular, the length of the first effective area (10) is represented by x1 and the width is represented by y1, and the length of the welding area (11) is represented by x2 and the width is represented by y2; The length and width of the first effective area (10) are determined by x1=mx2, y1=ny2, a=mn, where m is in the range of 0.1 to 0.95, and n is in the range of 0.1 to 0.

95.

2. The connector design method according to claim 1 .

4. Specifically, determining the specification dimensions of the first effective area (10) includes: When the welding area (11) is circular, the width of the first effective area (10) is represented by y1 and the radius of the welding area (11) is represented by r1; The length and width of the first effective area (10) are determined by r1≦0.95y1.

2. The connector design method according to claim 1 .

5. Specifically, determining the specification dimensions of the first effective area (10) includes: When the welding area (11) is elliptical, the longitudinal axis of the welding area (11) is parallel to the width direction of the first effective area (10), the length of the longitudinal axis of the welding area (11) is represented by L1, and the width of the first effective area (10) is represented by y1; L1:y1=(0.2-0.95):1 defines the length and width of the first effective area (10); 2. The connector design method according to claim 1 .

6. The distance between adjacent first effective areas (10) is represented by w1, the width of the first effective area (10) is represented by w2, and the width of the second effective area (20) is w3 = w1 + Nw2, where N is the number of the first effective areas (10).

2. The connector design method according to claim 1 .

7. A connector for use with a battery including a tab and a pole, The connector connects the tab and the pole, the connector including N first effective areas (10) and a second effective area (20); N≧1, the first effective area (10) is provided with a welding area (11) for connection with the tab, The second effective area (20) is in contact with the first effective area (10), and a plurality of the first effective areas (10) are located on the same side of the second effective area (20); The area S of the welded area (11) and the area S1 of the first effective area (10) satisfy the condition S=aS1, where a is within the range of 0.095 to 0.96; In the process of completing a predetermined number of charge / discharge cycles of the battery, a temperature rise of the welding mark during charging / discharging of the welding region (11) is less than a temperature rise threshold, a capacity maintenance rate is 85% or more, the temperature rise threshold is 10° C. or less, and the predetermined number of cycles is [0, 1500]. A connector characterized by:

8. The preset number of cycles is [0, 1000], and the capacity retention rate is 90% or more.

8. The connector according to claim 7.

9. When the welding area (11) is rectangular, the length of the first effective area (10) is represented by x1 and the width is represented by y1, and the length of the welding area (11) is represented by x2 and the width is represented by y2; x1=mx2, y1=ny2, a=mn, m is in the range of 0.1 to 0.95, and n is in the range of 0.1 to 0.95; 8. The connector according to claim 7.

10. When the welding area (11) is circular, the width of the first effective area (10) is represented by y1, the radius of the welding area (11) is represented by r1, and y1 and r1 satisfy r1≦0.95y1; 8. The connector according to claim 7.

11. When the welding area (11) is elliptical, the longitudinal axis of the welding area (11) is parallel to the width direction of the first effective area (10), and the ratio of the length L1 of the longitudinal axis to the width y1 of the first effective area (10) is (0.2 to 0.95):

1.

8. The connector according to claim 7.

12. 1. An energy storage device, comprising: The energy storage device includes a housing, an end cover provided to cover the housing, and the connector according to any one of claims 7 to 11, A pole to be connected to the connector is provided on the end cover.

1. An energy storage device comprising:

13. The energy storage device according to claim 12, The power-using facility is characterized by:

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