แบตเตอรี่ทุติยภูมิและอุปกรณ์ไฟฟ้า

Abstract

DEPCT69 แบตเตอรี่ทุติยภูมิรวมถึงชิ้นประกอบอิเล็กโทรดและชิ้นประกอบฝาครอบด้านบนสุด(500), ชิ้นประกอบอิเล็กโทรดรวมถึงตัวเซลล์(100)และชิ้นส่วนฉนวน(300)และชิ้นประกอบฝาครอบด้าน บนสุดรวมถึงชิ้นส่วนพลาสติกด้านล่าง(510)ชิ้นส่วนฉนวน(300)ถูกจัดให้มีไว้บนชิ้นส่วนพลาสติก ด้านล่าง(510)และสัมผัสกับตัวเซลล์(100)เพื่อเพิ่มพื้นที่สัมผัสระหว่างตัวเซลล์(100)และ ส่วนประกอบอื่นๆและลดแรงดันที่ถูกกำหนดไว้บนตัวเซลล์(100)ภายใต้สภาวะเช่นการ สั่นสะเทือนด้านข้างของชิ้นส่วนพลาสติกด้านล่าง(510)ที่อยู่ใกล้ชิ้นส่วนฉนวน(300)ถูกจัดให้มีมา พร้อมกับขั้นตอนการวางตำแหน่ง(511)และชิ้นส่วนฉนวน(300)สามารถถูกจับคู่กับขั้นตอนการวาง ตำแหน่ง(511)ได้เพื่อก่อรูปการวางตำแหน่งสัมพันธ์ระหว่างชิ้นส่วนพลาสติกด้านล่าง(510)และ ชิ้นส่วนฉนวน(300);

Description

Secondary batteries and electrical equipment

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to the Chinese patent application filed with the China Patent Office on June 28, 2023, with application number 202321669800.3 and application name “Secondary Batteries and Electrical Equipment”, the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The present application relates to, but is not limited to, the field of power battery technology, and specifically to a secondary battery and electrical equipment. Background Art

[0004] In secondary batteries, the contact area between the lower plastic and the body is small. Therefore, when subjected to vibration or in an inverted working condition, the area where the body and the lower plastic contact each other will be subjected to greater pressure, thereby causing the electrode to be crushed, which will in turn affect the performance and safety of the battery cell. Technical Solutions

[0005] The embodiments of the present application provide a secondary battery and an electrical device to increase the contact area between the end surface of the body and other components.

[0006] An embodiment of the present application provides a secondary battery, which has a height direction and includes an electrode assembly and a top cover assembly, the electrode assembly including a body and an insulating member arranged in sequence along the height direction, the body being arranged on a side of the insulating member away from the top cover assembly, the body and the insulating member being at least partially in contact with each other, the top cover assembly including a lower plastic, the lower plastic being connected to a side of the insulating member away from the body, wherein the end face of the body close to the insulating member is a first surface, and the area of ​​the first surface is S1; the end face of the insulating member close to the body is a second surface, the second surface is at least partially in contact with the first surface, the area of ​​the second surface in contact with the first surface is S2, the contact area between the lower plastic and the first surface is S3, and S1, S2 and S3 satisfy: 0.272≤(S2+S3): S1≤0.761.

[0007] Optionally, S1, S2, and S3 satisfy: 0.352≤(S2+S3): S1≤0.577.

[0008] Optionally, S2 is set to meet: 600mm 2 ≤S2≤1300mm 2 .

[0009] Optionally, S3 is set to meet: 200mm 2 ≤S3≤5000mm2 .

[0010] Optionally, the lower plastic is provided with a positioning step on a side close to the insulating member, and the insulating member is fitted on the positioning step.

[0011] Optionally, the secondary battery has a length direction, the insulating part has a first connecting part and a second connecting part spaced apart along the length direction, the first connecting part and the second connecting part are connected by a third connecting part, and the second surface includes the first connecting part, the second connecting part and the end face of the third connecting part close to the side of the main body; the positioning step includes a first step part and a second step part spaced apart along the length direction, there is a recessed area between the first step part and the second step part, the first connecting part is fixed on the first step part, and the second connecting part is fixed on the second step part, wherein the height direction and the length direction are perpendicular to each other.

[0012] Optionally, a first positioning portion is provided on the first connecting portion, a first matching portion is provided on the first step portion, and the first positioning portion is connected to the first matching portion in a matching manner.

[0013] Optionally, a second positioning portion is provided on the second connecting portion, a second matching portion is provided on the second step portion, and the second positioning portion is connected in a matching manner with the second matching portion.

[0014] Optionally, when a first positioning portion and a first matching portion are provided, one of the first positioning portion and the first matching portion is a clamping protrusion, and the other is a clamping groove.

[0015] Optionally, when the second positioning portion and the second matching portion are provided, one of the second positioning portion and the second matching portion is a clamping protrusion, and the other is a clamping groove.

[0016] Optionally, an avoidance groove is provided at the connection between the third connection part and the first connection part, and at the connection between the third connection part and the second connection part, and a tab is provided on the main body, and the tab is passed through the avoidance groove.

[0017] Optionally, the secondary battery also has a width direction, and the third connecting part has a first part and a second part, wherein the first part is close to the first connecting part and has a dimension L1 in the width direction, and L1 decreases along the length direction; the second part is close to the second connecting part and has a dimension L2 in the width direction, and L2 increases along the length direction, wherein the width direction, the length direction, and the height direction are perpendicular to each other.

[0018] Optionally, the secondary battery also has a width direction, and the length direction, width direction and height direction are perpendicular to each other, and the body is provided with a pole ear at one end close to the insulating part in the height direction; the first connecting part and the second connecting part are spaced apart along the length direction, and the insulating part also includes a limiting part, and the limiting part is located on both sides of the third connecting part along the width direction, and the limiting part protrudes in the direction close to the top cover assembly, and the end face of the limiting part close to the body is in contact with the pole ear.

[0019] Optionally, an opening is provided on the insulating member, and the opening passes through the insulating member along the height direction.

[0020] Correspondingly, an electrical device described in an embodiment of the present application includes the aforementioned secondary battery, the top cover assembly further includes a top cover sheet, and the lower plastic is located on a side of the top cover sheet close to the body.

[0021] In the embodiment of the present application, an insulating member is provided in the secondary battery. The insulating member is provided on the lower plastic and contacts the end face of the body close thereto, thereby increasing the contact area between the end face of the body and other components. As a result, when the body is subjected to vibration or is in an inverted working condition, the pressure on the body can be reduced accordingly to avoid crushing injuries.

[0022] In addition, in some embodiments, a step positioning portion can be provided on the insulating part for positioning the insulating part, and a corresponding snap-fit ​​structure can be provided between the step positioning portion and the insulating part to further achieve positioning and fixation of the insulating part to prevent the insulating part from shaking, displacement, etc., thereby improving the stability of the insulating part in use. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0024] FIG1 exemplarily shows a structural diagram of a secondary battery;

[0025] FIG2 exemplarily shows a schematic structural diagram of a lower plastic;

[0026] FIG3 exemplarily shows a schematic structural diagram of an insulating member in Example 6;

[0027] FIG4 exemplarily shows a schematic structural diagram of an insulating member in Example 7;

[0028] FIG5 exemplarily shows a schematic structural diagram of an insulating member in Example 8;

[0029] FIG6 exemplarily shows a schematic structural diagram of an insulating member in Example 9;

[0030] FIG7 exemplarily shows a schematic structural diagram of an insulating member in Example 10;

[0031] FIG8 exemplarily shows a schematic structural diagram of an insulating member in Example 11;

[0032] FIG9 exemplarily shows a schematic diagram of the cooperation between the insulating member and the top cover assembly in Example 12;

[0033] FIG10 exemplarily shows a schematic structural diagram of an insulating member in Example 12;

[0034] FIG11 exemplarily shows a partial enlarged schematic diagram of FIG10 ;

[0035] FIG12 exemplarily shows a top view of an insulating member in Example 12;

[0036] FIG13 exemplarily shows a cross-sectional view taken along line BB of FIG12 ;

[0037] FIG14 exemplarily shows a partial enlarged schematic diagram of FIG13;

[0038] FIG15 exemplarily shows a top view of an insulating member in Example 13;

[0039] FIG16 exemplarily shows a cross-sectional view taken along line AA of FIG15 ;

[0040] FIG17 exemplarily shows a partial enlarged schematic diagram of FIG16;

[0041] FIG. 18 exemplarily shows an exploded view of a secondary battery.

[0042] The main components in the embodiment of the present application are marked as follows: Body 100 First surface 110 Tab 120 Insulator 300 Second surface 310 First connecting portion 320 First positioning portion 321 Second connecting portion 330 Third connecting portion 340 First portion 341 Second portion 342 Limiting portion 350 Opening 360 Avoidance groove 370 Top cover assembly 500 Lower plastic 510 Positioning step 511 First step portion 5111 Second step portion 5112 Recessed area 512 First matching portion 520 Second matching portion 530 Top cover 540

[0043] Implementation Methods of the Application

[0044] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present application. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the present application, and are not used to limit the present application. In the present application, unless otherwise specified, the directional words used, such as "up", "down", "left", and "right", generally refer to the up, down, left, and right of the device in actual use or working state, specifically the drawing direction in the accompanying drawings.

[0045] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the quantity of the technical features indicated. Thus, features defined as "first" or "second" may explicitly or implicitly include at least one of these features.

[0046] An embodiment of the present application provides a secondary battery, as shown in FIG1 , which includes an electrode assembly and a top cover assembly 500. Furthermore, in the embodiment of the present application, in order to facilitate description of the positional relationship between the various components and the shape and structure of a single component, the length direction X, width direction Y, and height direction Z of the secondary battery are defined, wherein the length direction X, width direction Y, and height direction Z are perpendicular to each other. For example, here, the top cover assembly 500 is disposed at one end of the electrode assembly in the height direction Z.

[0047] The electrode assembly includes a body 100 and a tab 120 (see FIG18 ). The tab 120 is connected to the body 100. For example, the tab 120 is located on a side of the body 100 close to the top cover assembly 500 in the height direction Z. The body 100 can be a body 100 formed by winding, a laminated body 100 formed by lamination, or other forms of body 100. The examples in this embodiment do not constitute an undue limitation thereto.

[0048] In the height direction Z, the lower plastic 510 is connected to the end of the main body 100 close to the top cover assembly 500. Please continue to refer to Figure 1. The top cover assembly 500 includes the lower plastic 510. The top cover assembly 500 also includes the electrode terminal and the top cover sheet 540. The electrode terminal and the tab 120 are electrically connected. The lower plastic 510 is arranged between the top cover sheet 540 and the main body 100. The lower plastic 510 is an insulating plastic part that can prevent the secondary battery from short-circuiting.

[0049] The inventors of this application discovered that, due to the limited space required by the tabs 120, the contact area between the lower plastic 510 and the body 100 is relatively small. Consequently, when the secondary battery is subjected to external forces, such as during vibration or inversion, the pressure in the contact area between the body 100 and the lower plastic 510 is relatively high. This high pressure may damage the body 100, thereby affecting the performance and safety of the secondary battery.

[0050] To this end, in an embodiment of the present application, the electrode assembly further includes an insulating member 300, the main body 100 is arranged on a side of the insulating member 300 away from the top cover assembly 500, the main body 100 and the insulating member 300 are at least partially in contact with each other, the insulating member 300 is located on a side of the main body 100 close to the top cover assembly 500 in the height direction Z, and the aforementioned lower plastic 510 is connected to a side of the insulating member 300 away from the main body 100 in the height direction Z.

[0051] For example, referring to FIG1 , in some embodiments of the present application, a positioning step 511 is provided on the side of the lower plastic 510 proximate to the insulating member 300. The insulating member 300 can be fitted onto the positioning step 511 to achieve relative positioning between the lower plastic 510 and the insulating member 300. Typically, the positioning step 511 is provided at a location corresponding to the tab area, that is, a positioning step 511 is provided at a location corresponding to the cathode tab and at a location corresponding to the anode tab, respectively. Of course, the examples in this embodiment do not constitute an undue limitation.

[0052] Here, further referring to FIG. 2 , the positioning step 511 includes a first step portion 5111 and a second step portion 5112 spaced apart in the longitudinal direction X. The first step portion 5111 and the second step portion 5112 can be used to respectively position the two ends of the insulating member 300 in the longitudinal direction X. Here, a recessed area 512 is formed between the first step portion 5111 and the second step portion 5112 spaced apart. The projection of the recessed area 512 in the height direction Z covers the tab 120 so as to avoid the tab 120.

[0053] Of course, it is understandable that in other embodiments, the positioning step 511 may also have only one step portion, or have more step portions. For example, the positioning step 511 may have a step portion arranged circumferentially around the insulating part 300 in the XY plane, etc. It is only necessary that the positioning step 511 can cooperate with the insulating part 300 to position the insulating part 300. The examples in this embodiment do not constitute an undue limitation to this application.

[0054] Continuing to refer to FIG1 , the insulating member 300 is disposed corresponding to the position of the tabs. Typically, insulating members are disposed at the cathode tab and the anode tab, respectively. In other words, the insulating member 300 is disposed corresponding to the position of the cathode pole and the anode pole (not shown) of the top cover assembly 500. Of course, the examples in this embodiment do not constitute an undue limitation thereto.

[0055] Referring to Figure 3 , corresponding to the positioning step 511, the insulating member 300 has a first connecting portion 320 and a second connecting portion 330 spaced apart in the longitudinal direction X. The first connecting portion 320 and the second connecting portion 330 are connected by a third connecting portion 340. Referring to Figure 1 , the first connecting portion 320 fits on the first step 5111, and the second connecting portion 330 fits on the second step 5112, thereby establishing relative positioning between the insulating member 300 and the lower plastic 510.

[0056] Here, in order to fix the insulating member 300 to the lower plastic 510, in some embodiments, referring to FIG. 2 , a first matching portion 520 may be further provided on the first step portion 5111. Here, as shown in FIG. 2 , the first matching portion 520 is a snap-fit ​​groove.

[0057] Accordingly, referring to Figure 3 , the first connecting portion 320 is provided with a first positioning portion 321, which corresponds here to the first mating portion 520, which is a snap-fitting groove, and the first positioning portion 321 is a snap-fitting protrusion. Thus, referring to Figure 1 , the first positioning portion 321 can snap-fit ​​within the first mating portion 520, securing the first connecting portion 320 to the first step 5111. This facilitates the connection and removal of the first connecting portion 320 and the first step 5111, and also facilitates the assembly and removal of the plastic component from the lower plastic 510.

[0058] It is understood that in the above embodiment, the first positioning portion 321 is a snap-fitting protrusion and the first mating portion 520 is a snap-fitting groove. However, in other embodiments, the first positioning portion 321 may be a snap-fitting groove and the first mating portion 520 may be a snap-fitting protrusion, and this embodiment does not constitute an undue limitation. Alternatively, in other embodiments, the first connecting portion 320 and the first step portion 5111 may be fixed together using other fixing methods, such as gluing, hot melt connection, screw connection, etc.

[0059] Similarly, a second mating portion 530 may be provided on the second step portion 5112, and correspondingly, a second positioning portion may be provided on the second connecting portion 330. The second positioning portion may be mated with the second mating portion 530 to secure the second connecting portion 330 to the second step portion 5112. One of the second positioning portion and the second mating portion 530 may be a snap-fitting protrusion, and the other may be a snap-fitting groove. This snap-fitting arrangement facilitates the mating connection between the second connecting portion 330 and the second step portion 5112, facilitating easier assembly and disassembly of the plastic component on the lower plastic portion 510. Of course, similar to the mating connection between the first connecting portion 320 and the first step portion 5111 described above, in other embodiments, the mating connection between the second connecting portion 330 and the second step portion 5112 may also differ. The example in this embodiment does not unduly limit the present application.

[0060] Of course, it is understandable that the first connecting portion 320 and the first matching portion 520, the second connecting portion 330 and the second matching portion 530 can be provided at the same time, or only one group can be provided, for example, only the first connecting portion 320 and the first matching portion 520, or only the second connecting portion 330 and the second matching portion 530 can be provided. The examples in this embodiment do not constitute an undue limitation to this application.

[0061] The above example illustrates the connection relationship between the lower plastic 510 and the insulating member 300. Of course, it can be understood that in other embodiments of the present application, the connection method between the lower plastic 510 and the insulating member 300 is not limited to the above. It is sufficient that the two can be relatively fixed. The example in this embodiment does not constitute an undue limitation to the present application.

[0062] As mentioned above, the insulating member 300 is connected to the lower plastic 510, and the end surface of the insulating member 300 close to the main body 100 is in contact with the main body 100, thereby indirectly increasing the contact area between the lower plastic 510 and the main body 100, thereby improving the protection of the main body 100 when the secondary battery is subjected to vibration or inversion.

[0063] Continuing to refer to FIG. 1 , in some embodiments of the present application, the end surface of the body 100 near the insulating member 300 is defined as the first surface 110, and the area of ​​the first surface 110 is defined as S1. The end surface of the insulating member 300 near the body 100 is defined as the second surface 310. At least a portion of the second surface 310 is in contact with the first surface 110. Here, the area of ​​contact between the second surface 310 and the first surface 110 is defined as S2. Furthermore, the contact area between the lower plastic 510 and the first surface 110 is defined as S3.

[0064] Taking the aforementioned insulating member 300 having the first connecting portion 320, the second connecting portion 330, and the third connecting portion 340 as an example, the second surface 310 is the combined end surfaces of the first connecting portion 320, the second connecting portion 330, and the third connecting portion 340 on the side closest to the body 100. The third surface is roughly the end surface of the lower plastic 510 on the side closest to the body 100, after removing the aforementioned recessed area 512 and the positioning step 511.

[0065] Among them, the area of ​​S1 can be obtained by determining the projection figure formed by the projection of the first surface 110 on the XY plane, measuring the corresponding size with a vernier caliper, calculating the area with an area formula, or directly using an area measuring instrument to measure the area of ​​this part; S2 can be obtained by determining the projection figure of the part where the second surface 310 and the first surface 110 are in contact on the XY plane, measuring the corresponding size with a vernier caliper, calculating the area with an area formula, or directly using an area measuring instrument to measure the area of ​​this part; it should be noted that the part where the second surface 310 and the first surface 110 are in contact can be marked on the first surface 110 with a marker to form a closed outer contour line of the contact part between the insulating part 300 and the first surface 110. The closed figure formed by the outer contour line is the contact part between the second surface 310 and the first surface 110. If there are multiple contact parts, they are marked separately to form multiple closed figures, and the sum of the areas of the projection figures of the multiple closed figures on the XY plane is used as the size of S2. Similarly, the size of S3 can be determined by determining the projection figure of the contact portion between the lower plastic 510 and the first surface 110 on the XY plane, measuring the corresponding size with a vernier caliper, calculating the area using an area formula, or directly measuring the area of ​​the portion using an area meter. It should be noted that the contact portion between the lower plastic 510 and the first surface 110 can be marked on the first surface 110 with a marker pen. The closed outer contour line of the contact portion between the lower plastic 510 and the first surface 110 is the contact portion between the lower plastic 510 and the first surface 110. The closed figure formed by the outer contour line is the contact portion between the lower plastic 510 and the first surface 110. If there are multiple contact portions, they are marked separately to form multiple closed figures. The sum of the projection areas of the multiple closed figures on the XY plane is the size of S3.

[0066] In some embodiments of the present application, S1, S2, and S3 are set to satisfy the following condition: 0.272 ≤ (S2 + S3): S1 ≤ 0.761. This allows for reducing the pressure on the body 100 when subjected to force while also ensuring sufficient insulation at the connection between the lower plastic 510 and the body 100 within the secondary battery, sufficient flow area for the tab 120, and good connection strength between the insulating member 300 and the lower plastic 510. For example, the value of (S2 + S3): S1 can be 0.272, 0.273, 0.275, 0.28, 0.29, 0.3, 0.35, 0.5, 0.65, 0.7, 0.75, 0.755, 0.758, 0.76, 0.761, and any range of any two of the above values.

[0067] Here, when the ratio of (S2+S3):S1 is less than 0.272, there is sufficient space between the top cover assembly 500 and the body 100 for accommodating the tab 120, so the tab 120 can have a sufficient flow area. However, at this time, the contact area between the lower plastic 510 and the insulating member 300 and the body 100 is small, and the unevenly distributed pressure may damage the body 100. When the ratio of (S2+S3):S1 is greater than 0.761, the contact area between the lower plastic 510 and the insulating member 300 and the body 100 is sufficient, and the evenly distributed pressure is not likely to damage the body 100. However, the space for accommodating the tab 120 will become smaller, and the flow area of ​​the tab 120 may be insufficient. In view of this, in the embodiment of the present application, the ratio of (S2+S3):S1 is set within the range of 0.272-0.761, which helps to avoid crushing the body 100 while ensuring the current flow capacity of the tab 120.

[0068] Furthermore, in some optional embodiments, S1, S2, and S3 are set to satisfy the following condition: 0.352 ≤ (S2 + S3): S1 ≤ 0.577. For example, the values ​​of (S2 + S3): S1 are 0.352, 0.353, 0.355, 0.36, 0.4, 0.45, 0.5, 0.57, 0.573, 0.575, 0.576, 0.577, and the like, as well as ranges of any two of the above values. It is understood that the examples in this embodiment do not list all relevant numerical examples, that is, the relevant examples in this embodiment do not constitute an undue limitation to the present application.

[0069] Here, in some embodiments, on the basis of satisfying 0.272≤(S2+S3):S1≤0.761, S2 is set to satisfy: 600 mm 2 ≤S2≤1300mm 2 Thus, by limiting the size of the area where the second surface 310 and the first surface 110 are in contact with each other, the size of the insulating member 300 can be determined accordingly, thereby protecting the tab 120 and improving the connection strength.

[0070] In some embodiments, on the basis of satisfying 0.272≤(S2+S3):S1≤0.761, or on the basis of satisfying 0.272≤(S2+S3):S1≤0.761 and 600mm 2 ≤S2≤1300mm 2 Based on the S3 is set to meet: 200mm 2 ≤S3≤5000mm 2Thus, this configuration allows the lower plastic 510 in the embodiment of the present application to have a better insulation effect while not excessively limiting the size of the tab 120 , thereby ensuring the flow area of ​​the tab 120 .

[0071] Hereinafter, embodiments 1-5 and comparative examples 1-4 are provided, wherein the secondary batteries of embodiments 1-5 are provided with the aforementioned insulating member 300, and wherein the relevant parameters satisfy the conditions of 0.272≤(S2+S3):S1≤0.761. In comparative examples 1-4, although the insulating member 300 is provided, it does not satisfy the conditions of 0.272≤(S2+S3):S1≤0.761 and 600mm in the embodiments of the present application. 2 ≤S3≤1300mm 2 , 2000mm 2 ≤S1≤5000mm 2 For specific parameters, please refer to Table 1 below.

[0072] Table 1

[0073] In these embodiments, the size of S1 is set between 4500-7500. And it can be seen from Table 1 that compared with comparative examples 1-4, the secondary batteries of embodiments 1-5 of the present application meet 0.272≤(S2+S3): S1≤0.761, 600mm 2 ≤S2≤1300mm 2 , 200mm 2 ≤S3≤5000mm 2 In these embodiments, the contact area between the top cover assembly 500 and the body 100 is increased by disposing the insulating member 300, so that the body 100 is not easily crushed when subjected to external force.

[0074] In Comparative Example 1, since S3 is set to be smaller, there is a problem of internal insulation failure of the secondary battery due to insufficient hot-melt connection area of ​​the lower plastic 510; in Comparative Example 2, since S3 is set to be larger, the width of the tab 120 is restricted by the lower plastic 510, and the flow area of ​​the tab 120 may be insufficient; in Comparative Example 3, since S2 is set to be smaller, the insulating member 300 is smaller and it is more difficult to overlap the positioning step 511 of the lower plastic 510, that is, the insulating member 300 cannot be stably connected to the lower plastic 510; in Comparative Example 4, since S2 is set to be larger, the insulating member 300 is too large, especially the area of ​​the third connecting portion 340 of the insulating member 300 is too large, which may cause pressure damage to the main body 100.

[0075] Furthermore, in some embodiments, referring to FIG. 4 , the third connecting portion 340 includes a first portion 341 and a second portion 342 . The first portion 341 is closer to the first connecting portion 320 than the second portion 342 and has a dimension L1 in the width direction Y. Here, L1 decreases along the length direction X. In some embodiments of the present application, L1 gradually decreases along the length direction X. The second portion 342 is closer to the second connecting portion 330 than the first portion 341 and has a dimension L2 in the width direction Y. Here, L2 increases along the length direction X. In some embodiments of the present application, L2 gradually increases along the length direction X. As a result, the width of the third connecting portion 340 in the length direction X is larger at both ends and smaller in the middle. Furthermore, compared to the embodiment in which L1 is constantly a smaller size and / or L2 is constantly a smaller size (for example, the sizes of L1 and L2 are both constantly the size of the smaller width portion of the middle part of the third connecting portion 340 in this embodiment), the third connecting portion 340 provided in this embodiment, which is wide at both ends and narrow in the middle, helps to increase the size of the contact area S2 between the insulating member 300 and the main body 100, and at the same time will not cause greater interference with the tab 120 on the main body 100.

[0076] In some embodiments, referring to FIG. 3 , the first connecting portion 320 and the second connecting portion 330 are spaced apart along the length direction X, and the insulating member 300 further includes a stopper 350. The stopper 350 is provided on both sides of the third connecting portion 340 in the width direction Y, and the stopper 350 protrudes toward the top cover assembly 500. Here, the stopper 350 is integrally formed with the first connecting portion 320, the second connecting portion 330, and the third connecting portion 340. The stopper 350 is connected to the third connecting portion on the side proximal to the third connecting portion 340 in the width direction Y. Furthermore, the stopper 350 is connected to the first connecting portion 320 and the second connecting portion 330 at both ends in the length direction X. Of course, it is understood that in other embodiments, any of the first connecting portion 320, the second connecting portion 330, the third connecting portion 340, and the stopper 350 may be separately manufactured and then interconnected, and the examples in this embodiment do not constitute an undue limitation.

[0077] Furthermore, the end surface of the limiting portion 350 close to the body 100 contacts the tab 120, so that the limiting portion 350 can be used to press against the tab 120 to maintain the flatness of the tab 120. For example, for a bent tab 120, the tab 120 has two spaced-apart portions after being bent, both of which extend along the width direction Y, and a gap is formed between the two portions in the height direction Z. The limiting portion 350 can be located in the gap and press against the inner surface of the gap on the side close to the body 100. Of course, the examples in this embodiment do not constitute an undue limitation to the present application.

[0078] In some embodiments, referring to FIG3 , an opening 360 may be further provided on the insulating member 300 , and the opening 360 passes through the insulating member 300 along the height direction Z. The opening 360 is used to achieve ventilation and / or the introduction of electrolyte, etc., and may be provided on the first connecting portion 320 , the second connecting portion 330 , and the third connecting portion 340 , or on the aforementioned limiting portion 350 . The examples in this embodiment do not constitute an undue limitation thereto.

[0079] In some embodiments, referring to FIG13 , a relief groove 370 is provided at the connection between the third connecting portion 340 and the first connecting portion 320, and at the connection between the third connecting portion 340 and the second connecting portion 330. For details, refer to the partially enlarged schematic diagram of FIG14 , which illustrates the location of the relief groove 370. During use, the tabs 120 provided on the body 100 can be inserted into the relief groove 370.

[0080] Hereinafter, embodiments 6 to 13 are provided to further illustrate the structure of the insulating member 300 .

[0081] Example 6

[0082] Referring to FIG. 3 , in Example 6, an insulating member 300 includes a first connecting portion 320, a second connecting portion 330, and a third connecting portion 340. The first connecting portion 320 and the second connecting portion 330 are respectively connected to the ends of the third connecting portion 340 in the length direction X. The width of the third connecting portion 340 in the width direction Y remains constant. Furthermore, position limiting portions 350 are provided on both sides of the third connecting portion 340 along the width direction Y.

[0083] Example 7

[0084] Referring to FIG. 4 , in Example 7, the insulating member 300 also includes a first connecting portion 320, a second connecting portion 330, and a third connecting portion 340. The difference from Example 6 is that the width of the third connecting portion 340 in the width direction Y varies. Specifically, the width of the third connecting portion 340 in the width direction Y is greater near the first connecting portion 320 and the second connecting portion 330, i.e., at the first portion 341 and the second portion 342 at the ends of the third connecting portion 340 in the length direction X. As the width of the third connecting portion 340 moves away from the first connecting portion 320 and the second connecting portion 330, the width of the third connecting portion 340 in the width direction Y gradually decreases, i.e., the width is greater at the ends L1 and L2. Furthermore, the end surfaces of the third connecting portion 340 in the width direction Y are curved. As a result, compared to Example 6, the insulating member 300 in this embodiment has a larger contact area with the body 100, i.e., the insulating member 300 in this embodiment can provide a larger S2.

[0085] Example 8

[0086] Referring to FIG. 5 , in Example 8, the insulating member 300 also includes a first connecting portion 320, a second connecting portion 330, and a third connecting portion 340. This differs from Example 6 in that the width of the third connecting portion 340 varies in the width direction Y, thereby providing a larger S2. The difference from Example 7 is that the shape of the third connecting portion 340 is different. The first and second portions 341, 342 at the ends of the third connecting portion 340, which connect to the first and second connecting portions 320, 330, are tapered, meaning that L1 and L2 gradually decrease in opposing directions. The portion connecting the first and second portions 341, 342, remains constant in the width direction Y. This allows the third connecting portion 340 to better avoid the tab 120. Furthermore, the larger range of the stopper 350 improves the pressing effect on the tab 120, helping to maintain the flatness of the tab 120.

[0087] Example 9

[0088] 6 , in Example 9, the structure of the insulating member 300 is substantially the same as that of the insulating member 300 in Example 6, except that the third connecting portion 340 is wider in the width direction Y, thereby providing a larger S2.

[0089] Example 10

[0090] 7 , in Example 10, the structure of the insulating member 300 is substantially the same as that of the insulating member 300 in Example 7, except that the third connecting portion 340 is wider in the width direction Y, thereby providing a larger S2.

[0091] Example 11

[0092] Please refer to Figure 8. In Example 11, the structure of the insulating member 300 is roughly the same as that of the insulating member 300 in Example 8. The difference is that here, an avoidance groove 370 is provided at the connection between the third connection part 340 and the first connection part 320, and at the connection between the third connection part 340 and the second connection part 330 to facilitate the passage of the tab 120.

[0093] Example 12

[0094] Referring to Figures 9, 10, and 12, in Example 12, the structure of the insulating member 300 is substantially the same as that of the insulating member 300 in Example 9, except that, here, the limiting portions 350 are not provided on either side of the third connecting portion 340. Furthermore, referring to Figure 13, escape grooves 370 are provided at the connection between the third connecting portion 340 and the first connecting portion 320, and at the connection between the third connecting portion 340 and the second connecting portion 330, to facilitate passage of the tab 120. The escape grooves 370 at the connection between the third connecting portion 340 and the second connecting portion 330 are further illustrated in Figures 11 and 14. The structure of the escape grooves 370 at the connection between the first connecting portion 320 and the second connecting portion 330 is the same, and will not be further illustrated here.

[0095] Example 13

[0096] Referring to FIG15 , in Example 13, the structure of the insulating member 300 is substantially the same as that of the insulating member 300 in Example 9, with the difference being that, in conjunction with FIG16 , a relief groove 370 is provided at the connection between the third connecting portion 340 and the first connecting portion 320, and at the connection between the third connecting portion 340 and the second connecting portion 330, to facilitate passage of the tab 120. The relief groove 370 at the connection between the third connecting portion 340 and the second connecting portion 330 is further illustrated in FIG17 . The structure of the relief groove 370 at the connection between the first connecting portion 320 and the second connecting portion 330 is the same, and no further illustration is given here.

[0097] Accordingly, referring to Figures 1 to 17 , embodiments of the present application further provide an electrical device comprising the aforementioned secondary battery. Referring to Figure 18 , the top cover assembly 500 of the secondary battery further comprises a top cover sheet 540 , with the lower plastic 510 located on a side of the top cover sheet 540 proximal to the body 100 .

[0098] In addition, the secondary battery may further include a housing (not shown), on which a pole is provided, and the pole is connected to the tab 120 to achieve electrical connection. For example, the pole may be connected to the tab 120 via a connecting piece, but the example in this embodiment does not constitute an undue limitation thereto.

[0099] Here, the secondary battery is used to power electrical devices, which may include electric vehicles, electric motorcycles, electric tools, motors, etc. Of course, the examples in this embodiment do not constitute an undue limitation to the present application.

[0100] It can be understood that the meanings of the terms in the embodiments of the present application are the same. For the content that is not described in detail in a certain embodiment, the specific implementation details can refer to the descriptions in other embodiments. The example descriptions and technical effects shown in the aforementioned embodiments can all be implemented accordingly. For the repeated parts, this embodiment will not go into details.

[0101] The above is a detailed introduction to the secondary battery and electrical equipment provided by the present application. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core idea of ​​the present application. At the same time, for those skilled in the art, according to the idea of ​​the present application, there may be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

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