Battery cell, and battery pack

Abstract

A battery cell (100), and a battery pack. The battery cell (100) comprises: a casing (110), a bare cell core (130), and an insulating patch (120), wherein the casing (110) comprises a top cover (111), the top cover (111) being provided with a portion to be avoided, said portion comprising at least one of a post terminal (101), an explosion-proof valve (103) and a functional region (109); the bare cell core (130) is arranged in the casing (110), and the insulating patch (120) is attached to the side of the top cover (111) away from the bare cell core (130); and the insulating patch (120) is provided with at least one clearance hole (125), the clearance hole (125) being arranged corresponding to the post terminal (101), the explosion-proof valve (103) and the functional region (109), and the clearance hole (125) being used for exposing said portion. The area of the region enclosed by an outer edge of the insulating patch (120) is defined as S1 mm 2, the area of the clearance hole (125) is defined as S2 mm 2, and the thickness of the insulating patch (120) is defined as Hmm, 0.05≤(1-S2 / S1)*H≤0.5, wherein when there is one clearance hole (125), S2 represents the area of the single clearance hole (125), and when there are two or more clearance holes (125), S2 represents the total area of the clearance holes (125). In this way, the insulation performance of the insulating patch (120) can be improved.

Description

Single cells and battery packs

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on December 29, 2023, with application number 202311870216.9 and invention name “Single Cell and Battery Pack”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of battery technology, and in particular to a single cell and a battery pack. Background Art

[0003] A single battery cell consists of a metal casing and a bare cell mounted within it. The casing's top cover is typically affixed with an insulating patch to insulate it from external conductive components. Depending on actual usage, a clearance hole may be provided in the insulating patch. However, this can degrade the insulation performance of the patch. Summary of the Invention

[0004] The embodiments of the present application provide a single cell and a battery pack, which improve the insulation performance of an insulating patch.

[0005] To achieve the above objectives, the embodiments of the present application adopt the following technical solutions:

[0006] In one aspect, a single battery is provided, comprising a housing, a bare cell, and an insulating patch, wherein the housing includes a top cover, the top cover being provided with a portion to be avoided, the portion to be avoided including at least one of a terminal post, an explosion-proof valve, and a functional area, the bare cell being disposed within the housing, and the insulating patch being affixed to a side of the top cover away from the bare cell;

[0007] The insulating patch is provided with at least one avoidance hole, and the avoidance hole is used to expose the portion to be avoided;

[0008] The area of ​​the area enclosed by the outer edge of the insulating patch is S1mm 2 The area of ​​the avoidance hole is S2mm 2 , the thickness of the insulating patch is H mm, 0.05≤(1-S2 / S1)*H≤0.5;

[0009] When there is one avoidance hole, S2 represents the area of ​​the single avoidance hole; when there are two or more avoidance holes, S2 represents the total area of ​​the avoidance holes.

[0010] In some embodiments, the insulating patch has a first direction and a second direction perpendicular to each other, the top cover is provided with the functional area, the avoidance hole includes a fourth avoidance hole, the fourth avoidance hole is used to expose the functional area, the fourth avoidance hole includes a first side and a second side connected to each other, the first side extends along the first direction and its length dimension is a, the second side extends along the second direction and its length dimension is b, wherein a is 5mm~20mm, and / or b is 5mm~20mm.

[0011] In some embodiments, the top cover is provided with a pole terminal, and the avoidance hole includes a first avoidance hole, which is used to expose the pole terminal; the minimum distance between the pole terminal and the edge of the first avoidance hole is d2, where d2 is 0.05mm~1mm.

[0012] In some embodiments, the top cover is provided with an explosion-proof valve, and the avoidance hole includes a third avoidance hole, and the third avoidance hole is used to expose the explosion-proof valve. The top cover is also connected to a protective sheet on the side away from the bare battery cell, and the protective sheet covers the explosion-proof valve. The positive projection of the protective sheet on the insulating patch is located in the third avoidance hole; the minimum distance between the edge of the protective sheet and the edge of the third avoidance hole is d1, where d1 is 0.05mm~1mm.

[0013] In some embodiments, the top cover is provided with the pole terminal and / or the functional area, and the avoidance hole includes a first avoidance hole and / or a fourth avoidance hole, the first avoidance hole is used to expose the pole terminal, and the fourth avoidance hole is used to expose the functional area, the first avoidance hole and / or the fourth avoidance hole are quadrilateral, and rounded corners are provided at the corners of the first avoidance hole and / or the fourth avoidance hole.

[0014] In some embodiments, the outer contour of the insulating patch is quadrilateral, and the corners of the insulating patch are rounded.

[0015] In some embodiments, the functional area includes a first functional area and a second functional area, and the insulating patch is provided with two fourth avoidance holes, which are respectively used to expose the first functional area and the second functional area, and the center of the top cover is located between the two fourth avoidance holes in the positive projection of the insulating patch.

[0016] In some embodiments, the functional area corresponds to an identification code functional area, the avoidance hole includes a fourth avoidance hole, the fourth avoidance hole is used to expose the functional area, and the positive projection of the identification code on the insulating patch is located in the fourth avoidance hole.

[0017] In some embodiments, the top cover is provided with the functional area, the avoidance hole includes a fourth avoidance hole, the fourth avoidance hole is used to expose the functional area, the insulating patch has a first direction and a second direction perpendicular to each other, the insulating patch includes two long sides extending along the first direction, the two long sides are spaced apart along the second direction, the fourth avoidance hole includes a center line extending along the first direction, the shortest distance from the center line to one of the long sides is c, and the width of the insulating patch along the second direction is w, wherein 0.1≤c / w≤0.5.

[0018] On the other hand, a battery pack is provided, comprising the above-mentioned single battery.

[0019] In some embodiments, the battery pack further includes a temperature sensor, which is connected to a side of the top cover away from the bare cell. The functional area corresponds to a temperature sensor for measuring the temperature of the single cell. The avoidance hole includes a fourth avoidance hole, which is used to expose the functional area, and the orthographic projection of the temperature sensor on the insulating patch is located within the fourth avoidance hole.

[0020] The single cell and battery pack provided in the embodiment of the present application have an insulating patch on the side of the top cover away from the bare cell. The insulating patch has a avoidance hole, which is set with the corresponding pole terminal, explosion-proof valve, and functional area. The avoidance hole is used to allow the pole terminal to pass through and the explosion-proof valve or functional area to be exposed. The area enclosed by the outer edge of the insulating patch is S1mm 2 , the area of ​​the avoidance hole is S2mm 2 The thickness of the insulating patch is Hmm, 0.05≤(1-S2 / S1)*H≤0.5, which can not only ensure that the insulating patch can correspond to the pole terminal, explosion-proof valve, and functional area, but also meet the insulation performance requirements of the insulating patch and improve the insulation performance of the insulating patch. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0022] FIG1 exemplarily shows the structure of a single cell;

[0023] FIG2 exemplarily shows a cross-sectional view of a single cell;

[0024] FIG3 exemplarily shows an exploded view of a single cell;

[0025] FIG4 exemplarily shows the structure of an insulating patch.

[0026] Figure markings: 100-single cell; 110-shell; 111-top cover; 101-pole terminal; 101a-positive terminal; 101b-negative terminal; 103-explosion-proof valve; 104-protective sheet; 109-functional area; 109a-first functional area; 109b-second functional area; 120-insulating patch; 1-long side; 2-short side; 121-first avoidance hole; 122-second avoidance hole; 123-third avoidance hole; 124-fourth avoidance hole; 125-avoidance hole; 124a-first side; 124b-second side; 130-bare cell. Specific embodiments

[0027] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0028] In the embodiments of the present application, words such as "first", "second", "third", and "fourth" are used to distinguish between identical or similar items with basically the same functions and effects. This is only for the purpose of clearly describing the technical solutions of the embodiments of the present application, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features.

[0029] In the embodiments of the present application, “a plurality of” means two or more, and “at least one” means one or more, unless otherwise clearly defined.

[0030] In the embodiments of the present application, the terms "upper" and "lower" indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0031] The present application provides a battery pack, which can be a power battery pack used in electric vehicles to provide power to the electric vehicle's drive motor, etc. Of course, the battery pack can also be other types of battery packs, such as those used in electric bicycles and electric motorcycles. The present application does not limit the type of battery pack or its application scenario.

[0032] A battery pack includes a housing and individual cells housed within it. The housing protects the individual cells from impact. The housing may include a mounting cavity, in which the individual cells are mounted. The battery pack may include multiple individual cells arranged in an array. When multiple individual cells are installed within the housing, they may be connected in series or in parallel.

[0033] The battery pack may also include a thermal management component connected to the individual cells to regulate the temperature of the individual cells. For example, multiple individual cells are arranged in an array, and the arrayed multiple individual cells form multiple cell groups. Each cell group includes multiple individual cells. The multiple individual cells within a battery group are arranged sequentially along a straight line, and the multiple cell groups are arranged in intervals perpendicular to the straight line. The thermal management component is located between two adjacent cell groups, with one side of the thermal management component connected to the individual cells in one cell group and the opposite side of the thermal management component connected to the individual cells in the other cell group.

[0034] Among them, the connection between the thermal management component and the single cell refers to any combination method in which the heat generated by the single cell can be transferred to the thermal management component through heat transfer. The thermal management component can be in direct contact or physical connection with the single cell, or the thermal management component can be connected to the single cell through other heat-conducting media to achieve heat transfer.

[0035] In actual application, the box body may be provided with a charging interface for charging and a discharging interface for discharging, and the installation cavity in the box body may also be provided with modules such as a battery management system.

[0036] As shown in Figures 1 to 3, the single battery 100 includes a shell 110 and a bare cell 130. The shell 110 is provided with a receiving cavity, and the bare cell 130 is arranged in the receiving cavity so that the shell 110 protects the bare cell 130 and prevents the bare cell 130 from being subjected to external collision or scratches.

[0037] In practical applications, an electrolyte may be provided in the accommodating cavity, and part or all of the bare cell 130 is immersed in the electrolyte. The accommodating cavity may be a sealed structure to prevent leakage of the electrolyte in the accommodating cavity.

[0038] The housing 110 may include a plurality of side walls, which are connected to form a receiving cavity. As shown in FIG1 and FIG2 , the plurality of side walls include side walls formed by a top cover 111, and the top cover 111 is provided with a portion to be avoided, and the portion to be avoided includes at least one of the pole terminal 101, the explosion-proof valve 103, and the functional area 109. That is, the top cover 111 may be provided with the pole terminal 101, the explosion-proof valve 103, and the functional area 109 at the same time (as shown in FIG3 ), or the top cover 111 may be provided with any two of the pole terminal 101, the explosion-proof valve 103, and the functional area 109, or the top cover 111 may be provided with any one of the pole terminal 101, the explosion-proof valve 103, and the functional area 109.

[0039] Exemplarily, the shell 110 includes a top cover 111 and a lower shell. A cavity is provided in the lower shell. The top cover 111 is connected to the open end of the cavity and is sealed to the lower shell so that the top cover 111 and the lower shell together form an accommodating cavity.

[0040] In practical applications, the housing 110 can be made of metal materials such as aluminum. When the housing 110 is made of metal materials, the top cover 111 can be welded to the lower housing.

[0041] One end of the pole terminal 101 is electrically connected to the bare cell 130, and the other end is electrically connected to an external circuit, so that the bare cell 130 is electrically connected to the external circuit through the pole terminal 101, thereby realizing the charging and discharging of the single battery 100. As shown in Figure 1, the pole terminal 101 may include a positive terminal 101a and a negative terminal 101b. The positive terminal 101a is electrically connected to the positive tab of the bare cell 130, and the negative terminal 101b is electrically connected to the negative tab of the bare cell 130. When the pole terminal 101 includes the positive terminal 101a and the negative terminal 101b, the top cover 111 may be provided with the positive terminal 101a or the negative terminal 101b, or may be provided with both the positive terminal 101a and the negative terminal 101b.

[0042] The explosion-proof valve 103 can open when the pressure in the accommodating chamber reaches a preset threshold. When the explosion-proof valve 103 is opened, the accommodating chamber is connected to the external space through the explosion-proof valve 103, so that the high-temperature and high-pressure gas in the accommodating chamber is discharged to the external space through the explosion-proof valve 103.

[0043] The functional area 109 is an area on the top cover 111. The functional area 109 can be spaced apart from other areas on the top cover 111, or it can be adjacent to other areas on the top cover 111. The functional area 109 can be an area for a robot to grasp, for example, when preparing a battery pack, the robot grasps the single battery 100 by grasping the functional area; the functional area 109 can also be an area for printing or etching an identification code, for example, a QR code, barcode, or other identification code for identifying the information of the single battery 100 is printed or etched in the functional area 109; the functional area 109 can also be an area for temperature measurement, for example, by measuring the temperature of the functional area to determine the temperature of the bare cell 130 and the single battery 100. Of course, the functional area 109 can also be an area with other functions, which are not listed here one by one.

[0044] As shown in Figures 1 to 3, an insulating patch 120 is provided on the side of the top cover 111 away from the bare cells 130. The insulating patch 120 insulates the top cover 111 from external conductive structures, preventing the single cells 100 from shorting to the external conductive structures through the top cover 111. Furthermore, the insulating patch 120 protects the top cover 111 from contaminants.

[0045] The insulating patch 120 can be made of insulating materials such as plastic, rubber, etc. In actual application, the insulating patch 120 can be bonded to the side of the top cover 111 away from the bare battery cell 130 by adhesive.

[0046] The insulating patch 120 is provided with at least one escape hole 125 for exposing the portion to be escaped. Specifically, the escape hole 125 is used to expose the installed pole terminal 101, the explosion-proof valve 103, and the functional area 109. The escape hole 125 penetrates the insulating patch 120 along its thickness.

[0047] When a pole terminal 101 is provided on the top cover 111, the avoidance hole 125 is provided corresponding to the pole terminal 101, and part of the structure of the pole terminal 101 is provided within the avoidance hole 125. For example, as shown in FIG4 , the avoidance hole 125 includes a first avoidance hole 121 provided opposite the positive terminal 101a and a second avoidance hole 122 provided opposite the negative terminal 101b. The positive terminal 101a is provided within the first avoidance hole 121, and the negative terminal 101b is provided within the second avoidance hole 122, to prevent the insulating patch 120 from blocking the pole terminal 101.

[0048] In some other embodiments, the positive terminal 101 a may correspond to the second avoidance hole 122 , and the negative terminal 101 b may correspond to the first avoidance hole 121 .

[0049] When an explosion-proof valve 103 is provided on the top cover 111, the avoidance hole 125 is provided corresponding to the explosion-proof valve 103, and the orthographic projection of the explosion-proof valve 103 on the insulating patch 120 is opposite to the avoidance hole 125. For example, as shown in FIG4 , the avoidance hole 125 includes a third avoidance hole 123 provided opposite to the explosion-proof valve 103, and the orthographic projection of the explosion-proof valve 103 on the insulating patch 120 is opposite to the avoidance hole 125, preventing the insulating patch 120 from blocking the exhaust path of the explosion-proof valve 103.

[0050] When the functional area 109 is provided on the top cover 111, the avoidance hole 125 is provided corresponding to the functional area 109 so that the functional area 109 is exposed through the avoidance hole 125. For example, as shown in FIG4 , the avoidance hole 125 includes a fourth avoidance hole 124 provided opposite to the functional area 109. At least a portion of the structure of the functional area 109 is exposed through the fourth avoidance hole 124, thereby preventing the insulating patch 120 from blocking the functional area 109.

[0051] For example, when the functional area 109 is used for grasping by a robot, the robot can directly grasp the top cover 111 through the fourth avoidance hole 124 , making it easier for the robot to grasp the single battery 100 .

[0052] For another example, when functional area 109 is used for temperature measurement, the battery pack also includes a temperature sensor connected to the side of top cover 111 away from bare cells 130, with its orthographic projection on insulating patch 120 located within escape hole 125. The temperature sensor can directly measure the temperature of functional area 109 through fourth escape hole 124, allowing for more accurate determination of the temperature of bare cells 130 and individual batteries 100.

[0053] For example, when the functional area 109 corresponds to the identification code functional area, the functional area 109 is used to print or etch the identification code. The positive projection of the identification code on the insulating patch 120 is located in the avoidance hole 125. The identification code located in the functional area 109 can be read through the fourth avoidance hole 124, making the reading of the identification code more convenient.

[0054] When the top cover 111 is provided with multiple pole terminals 101, explosion-proof valves 103, and functional areas 109, the insulating patch 120 may be provided with multiple avoidance holes 125. Exemplarily, as shown in FIG4 , the avoidance holes 125 include a first avoidance hole 121, a second avoidance hole 122, a third avoidance hole 123, and a fourth avoidance hole 124. The positive terminal 101a is passed through the first avoidance hole 121, and the negative terminal 101b is passed through the second avoidance hole 122. The orthographic projection of the explosion-proof valve 103 on the insulating patch 120 is opposite to the avoidance hole 125, so that the explosion-proof valve 103 is exposed, and at least part of the structure of the functional area 109 is exposed through the fourth avoidance hole 124.

[0055] Of course, the avoidance hole 125 may also include any two or any three of the first avoidance hole 121 , the second avoidance hole 122 , the third avoidance hole 123 and the fourth avoidance hole 124 .

[0056] Among them, the avoidance hole 125 can be a circular hole, a rectangular hole, a rounded rectangular hole, a waist-shaped hole or a hole of other irregular shapes. The embodiment of the present application does not limit the shape of the avoidance hole 125.

[0057] The area of ​​the area enclosed by the outer edge of the insulating patch 120 is S1mm 2 , the area of ​​the avoidance hole 125 is S2mm 2 The thickness of the insulating patch 120 is H mm, satisfying 0.05 ≤ (1-S2 / S1)*H ≤ 0.5. For example, (1-S2 / S1)*H is any value among 0.1, 0.2, 0.3, 0.4, and 0.5, or a range consisting of any two of them, ensuring the insulation performance of the insulating patch 120 while ensuring that the strength of the insulating patch 120 meets the usage requirements.

[0058] Illustratively, H is 0.1 mm to 0.5 mm, for example, H is any value of 0.15 mm, 0.18 mm, 0.20 mm, 0.220 mm, 0.222 mm, 0.225 mm, 0.228 mm, 0.230 mm, 0.322 mm, 0.425 mm, 0.5 mm, or a range consisting of any two values.

[0059] Exemplarily, S1 is 1440 square millimeters to 95560 square millimeters, for example, S1 is any value of 1440 square millimeters, 2400 square millimeters, 6000 square millimeters, 12000 square millimeters, 25560 square millimeters, 35000 square millimeters, 55560 square millimeters, 72000 square millimeters, 95560 square millimeters, or a range consisting of any two values.

[0060] Exemplarily, S2 is 890 square millimeters to 3562 square millimeters. For example, S2 is any value of 890 square millimeters, 1117 square millimeters, 2354 square millimeters, 3351 square millimeters, 3562 square millimeters, or a range consisting of any two values.

[0061] When there is one avoidance hole 125 , S2 represents the area of ​​the single avoidance hole 125 ; when there are two or more avoidance holes 125 , S2 represents the total area of ​​the multiple avoidance holes 125 .

[0062] Exemplarily, as shown in Figure 4, the insulating patch 120 has a first direction X and a second direction Y that are perpendicular to each other. The insulating patch 120 includes two long sides 1 extending along the first direction X and two short sides 2 extending along the second direction Y. The two long sides 1 are arranged at intervals along the second direction Y, and the two short sides 2 are arranged at intervals along the first direction X. The area enclosed by the two long sides 1 and the two short sides 2 is S1.

[0063] Exemplarily, when the avoidance hole 125 includes the first avoidance hole 121 , the second avoidance hole 122 , the third avoidance hole 123 and the fourth avoidance hole 124 , S2 is the sum of the areas of the first avoidance hole 121 , the second avoidance hole 122 , the third avoidance hole 123 and the fourth avoidance hole 124 .

[0064] As shown in FIG3 , in some embodiments, a protective sheet 104 is further connected to the side of the top cover 111 away from the bare cell 130. The protective sheet 104 covers the explosion-proof valve 103, and the orthographic projection of the protective sheet 104 on the insulating patch 120 is located within the avoidance hole 125. The protective sheet 104 can protect the explosion-proof valve 103 from collision or corrosion.

[0065] The following Table 1 provides corresponding embodiments and comparative examples to further illustrate the beneficial effects of the insulation performance of the insulation patch 120 and the assembly yield rate of the insulation patch 120. Only when the insulation performance test results and the assembly yield rate results are both qualified, the test results of the insulation patch 120 are determined to be suitable. The test method for the insulation performance is as follows:

[0066] 1) Prepare a single cell 100 according to the parameters of Examples 1-9 and Comparative Examples 1-2. Use an insulation resistance tester to test the prepared single cell 100 under an AC power supply of 2230V or a DC power supply of 3150V for 60S. If the leakage current is ≤1mA, it is qualified;

[0067] 2) The insulation resistance is ≥1Gohm under a DC power supply voltage of 1000V, which is qualified.

[0068] The test method for assembly yield is as follows:

[0069] 1) According to the parameters in the table, 50 single cells 100 were prepared according to the parameters corresponding to each embodiment and each comparative example;

[0070] 2) Visually inspect the appearance of each single battery cell 100. If there is any defective phenomenon such as glue overflow, bulging, or warping around the protective sheet 104, pick it out and consider it as a poor installation;

[0071] 3) If the pole terminal 101 is visually skewed during installation, or the avoidance hole 125 is too small to complete the assembly, it is considered unqualified;

[0072] 4) As long as any of the situations 2) and 3) occurs, it is considered as poor assembly. The number of poor assemblies is accumulated, divided by the total number of experimental single cells 100 (50) and multiplied by 100% to obtain the assembly yield. When the assembly yield is greater than 99%, the result is qualified, otherwise it is unqualified.

[0073] Table 1

[0074] The minimum distance between the edge of the protective sheet 104 and the edge of the corresponding avoidance hole 125 is d1, where d1 is 0.05mm to 1mm. For example, d1 is any value of 0.05mm, 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, or a range consisting of any two of them. When d1 is less than 0.05mm, the edge of the protective sheet 104 and the edge of the avoidance hole 125 are easily interfered with by the processing errors of the protective sheet 104 and the avoidance hole 125, affecting the installation yield of the protective sheet 104. For details, please refer to Table 2. When d1 is greater than 1mm, the distance between the edge of the protective sheet 104 and the edge of the avoidance hole 125 is large, so that the exposed portion of the top cover 111 is large, which is not conducive to achieving insulation of the top cover 111.

[0075] In some specific embodiments, the minimum distance between the pole terminal 101 and the edge of the corresponding avoidance hole 123 is d2, where d2 is 0.05mm to 1mm. For example, d2 is any value of 0.05mm, 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, or a range consisting of any two of them. When d2 is less than 0.05mm, the installation of the pole terminal 101 is difficult, and the edge of the pole terminal 101 and the edge of the avoidance hole 125 are likely to interfere with each other, affecting the installation yield of the pole terminal 101. For details, please refer to Table 2. When d2 is greater than 1mm, the distance between the edge of the pole terminal 101 and the edge of the avoidance hole 125 is large, so that a larger portion of the top cover 111 is exposed, which is not conducive to achieving insulation of the top cover 111.

[0076] The specific test method for the installation yield is as follows: through visual inspection, if there are any defects such as glue overflow, bulging, warping, etc. around the protective sheet 104, pick it out and regard it as a poor installation;

[0077] If the pole terminal 101 is visually skewed during installation and the conductivity is poor during inspection, it is considered to be a case of poor installation.

[0078] Table 2

[0079] As shown in FIG4 , in some embodiments, the avoidance hole 125 corresponding to the functional area 109 includes a centerline extending along the first direction X, the shortest distance from the centerline to one of the long sides 1 is c, and the width of the insulating patch 120 along the second direction Y is w, where 0.1 ≤ c / w ≤ 0.5. For example, c / w is any value of 0.1, 0.2, 0.3, 0.4, 0.5, or a range consisting of any two of them.

[0080] Exemplarily, w is 10 mm to 100 mm, for example, w is any value among 10 mm, 20 mm, 50 mm, 60 mm, 80 mm, 100 mm, or a range consisting of any two of them.

[0081] Illustratively, 3mm<c<80mm, for example, c is any value among 3mm, 5mm, 6mm, 8mm, 10mm, 20mm, 50mm, 60mm, 70mm, 80mm, or a range consisting of any two of them.

[0082] When c / w is less than 0.1, the distance between the avoidance hole 125 and the edge of the insulating patch 120 is closer, and when c / w is greater than 0.5, the distance between the avoidance hole 125 and the edge of the insulating patch 120 is farther.

[0083] For example, when the functional area 109 is used for a robot to grasp, the position of the avoidance hole 125 is the position where the robot grasps. When the distance between the avoidance hole 125 and the edge of the insulating patch 120 is too close, the grasping position is far away from the center of gravity of the single battery 100, and the force is uneven after grasping.

[0084] For another example, when the functional area 109 is used for temperature measurement, the position of the avoidance hole 125 is the temperature measurement position. When the distance between the avoidance hole 125 and the edge of the insulating patch 120 is too far, the temperature measurement position is closer to the center of the single cell 100, and the highest temperature of the single cell 100 and the bare cell 130 is not at the center position, so that the temperature measured by the temperature sensor cannot accurately reflect the overall temperature of the single cell 100 and the temperature of the bare cell 130.

[0085] As shown in FIG4 , in some embodiments, the avoidance hole 125 is quadrilateral, with rounded corners at the corners. The radius of the rounded corner is r, where 0.2 mm ≤ r ≤ 2 mm. For example, r is any value among 0.2 mm, 0.4 mm, 0.5 mm, 0.8 mm, 1 mm, 1.2 mm, 1.5 mm, 1.8 mm, and 2 mm, or a range consisting of any two of these values.

[0086] When r is less than 0.2 mm, flashing is easily generated at the rounded corners. When r is greater than 2 mm, the structure at the rounded corners is too large, reducing the area of ​​the avoidance hole 125. For example, when an identification code is provided in the functional area 109, the structure at the rounded corners is likely to block part of the identification code.

[0087] As shown in FIG4 , in some embodiments, the avoidance hole 125 corresponding to the functional area 109 includes a first side 124 a and a second side 124 b connected to each other. The first side 124 a extends along a first direction X and has a length a. The second side 124 b extends along a second direction Y and has a length b. Where a is 5 mm to 20 mm, and / or b is 5 mm to 20 mm. For example, a is any value of 5 mm, 8 mm, 10 mm, 15 mm, 18 mm, or 20 mm, or a range consisting of any two of them. b is any value of 5 mm, 8 mm, 10 mm, 15 mm, 18 mm, or 20 mm, or a range consisting of any two of them.

[0088] In actual application, when the functional area 109 is used for robot grasping, a and b can be flexibly set according to the size of the robot nozzle; when the functional area 109 is used for temperature measurement, a and b can be flexibly set according to the size of the temperature sensor; when the functional area 109 is used for printing or etching an identification code, a and b can be flexibly set according to the size of the identification code.

[0089] Among them, a and b may be equal or unequal, and this embodiment of the present application does not limit this.

[0090] As shown in FIG4 , in some embodiments, the outer contour of the insulating patch 120 is a quadrilateral, and the corners of the insulating patch 120 are rounded. The radius of the rounded corners is R, where 2 mm ≤ R ≤ 4 mm. For example, R is any value among 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, or a range consisting of any two of them.

[0091] When R is less than 2 mm, the corners of the insulating patch 120 are sharp and can easily damage the insulating film layers of other single cells 100. When R is greater than 4 mm, the insulating patch 120 cannot completely cover the top cover 111, reducing the insulation performance of the top cover 111.

[0092] As shown in FIG3 , in some embodiments, the functional area 109 includes a first functional area 109a and a second functional area 109b . The functions of the first functional area 109a and the second functional area 109b may be the same or different. For example, the first functional area 109a and the second functional area 109b may both be used for robotic grasping, temperature measurement, or printing or etching an identification code. Alternatively, the first functional area 109a may be used for robotic grasping, while the second functional area 109b may be used for temperature measurement or carrying an identification code.

[0093] As shown in Figure 4, the insulating patch 120 is provided with two avoidance holes 125 corresponding to the first functional area 109a and the second functional area 109b, respectively. When both the first functional area 109a and the second functional area 109b are used for grasping by the robot, the center of gravity of the single battery 100, as projected on the insulating patch 120, is located between the two avoidance holes 125, ensuring a more balanced force and more stable grasping when the robot grasps the single battery 100.

[0094] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A single cell (100), wherein: The invention comprises a shell (110), a bare battery cell (130) and an insulating patch (120), wherein the shell (110) comprises a top cover (111), the top cover (111) is provided with a portion to be avoided, the portion to be avoided comprises at least one of a pole terminal (101), an explosion-proof valve (103) and a functional area (109), the bare battery cell (130) is arranged in the shell (110), and the insulating patch (120) is attached to a side of the top cover (111) away from the bare battery cell (130); The insulating patch (120) is provided with at least one avoidance hole (125), and the avoidance hole (125) is used to expose the portion to be avoided; The area of ​​the region enclosed by the outer edge of the insulating patch (120) is S1 mm 2 The area of ​​the avoidance hole (125) is S2mm 2 , the thickness of the insulating patch (120) is H mm, 0.05≤(1-S2 / S1)*H≤0.5; When there is one avoidance hole (125), S2 represents the area of ​​the single avoidance hole (125); when there are two or more avoidance holes (125), S2 represents the total area of ​​the avoidance holes (125).

2. The single cell (100) according to claim 1, wherein: The insulating patch (120) has a first direction (X) and a second direction (Y) that are perpendicular to each other, the top cover (111) is provided with the functional area (109), the avoidance hole (125) includes a fourth avoidance hole (124), the fourth avoidance hole (124) is used to allow the functional area (109) to be exposed, and the fourth avoidance hole (124) includes a first side (124a) and a second side (124b) that are connected to each other, the first side (124a) extends along the first direction (X) and has a length dimension a, and the second side (124b) extends along the second direction (Y), and a is 5 mm to 20 mm.

3. The single cell (100) according to claim 2, wherein: The second side (124b) extends along the second direction (Y) and has a length dimension b, where b is 5 mm to 20 mm.

4. The single cell (100) according to claim 1, wherein: The insulating patch (120) has a first direction (X) and a second direction (Y) that are perpendicular to each other, the top cover (111) is provided with the functional area (109), the avoidance hole (125) includes a fourth avoidance hole (124), the fourth avoidance hole (124) is used to allow the functional area (109) to be exposed, and the fourth avoidance hole (124) includes a first side (124a) and a second side (124b) that are connected to each other, the first side (124a) extends along the first direction (X), and the second side (124b) extends along the second direction (Y) and has a length dimension b, where b is 5 mm to 20 mm.

5. The single cell (100) according to claim 1, wherein: The top cover (111) is provided with a pole terminal (101), and the avoidance hole (125) comprises a first avoidance hole (121), and the first avoidance hole (121) is used to allow the pole terminal (101) to be exposed; The minimum distance between the pole terminal (101) and the edge of the first avoidance hole (121) is d2, wherein d2 is 0.05 mm to 1 mm.

6. The single cell (100) according to claim 1, wherein: The top cover (111) is provided with an explosion-proof valve (103), the avoidance hole (125) includes a third avoidance hole (123), the third avoidance hole (123) is used to allow the explosion-proof valve (103) to be exposed, and a protective sheet (104) is also connected to the side of the top cover (111) away from the bare battery cell (130), the protective sheet (104) covers the explosion-proof valve (103), and the orthographic projection of the protective sheet (104) on the insulating patch (120) is located in the third avoidance hole (123); The minimum distance between the edge of the protection sheet (104) and the edge of the third avoidance hole (123) is d1, wherein d1 is 0.05 mm to 1 mm.

7. The single cell (100) according to claim 1, wherein: The top cover (111) is provided with the pole terminal (101), and the avoidance hole (125) comprises a first avoidance hole (121), the first avoidance hole (121) is used for exposing the pole terminal (101), the first avoidance hole (121) is quadrilateral, and a rounded corner is provided at the corner of the first avoidance hole (121).

8. The single cell (100) according to claim 1, wherein: The top cover (111) is provided with the functional area (109), and the avoidance hole (125) includes a fourth avoidance hole (124), the fourth avoidance hole (124) is used to allow the functional area (109) to be exposed, the fourth avoidance hole (124) is quadrilateral, and rounded corners are provided at the corners of the fourth avoidance hole (124).

9. The single cell (100) according to claim 1, wherein: The top cover (111) is provided with the pole terminal (101) and the functional area (109); the avoidance hole (125) comprises a first avoidance hole (121) and a fourth avoidance hole (124); the first avoidance hole (121) is used for exposing the pole terminal (101); the fourth avoidance hole (124) is used for exposing the functional area (109); the first avoidance hole (121) and the fourth avoidance hole (124) are both quadrilaterals; and rounded corners are provided at the corners of the first avoidance hole (121) and the fourth avoidance hole (124).

10. The single cell (100) according to claim 1, wherein: The outer contour of the insulating patch (120) is quadrilateral, and the corners of the insulating patch (120) are provided with rounded corners.

11. The single cell (100) according to claim 1, wherein: The functional area (109) comprises a first functional area (109a) and a second functional area (109b); the insulating patch (120) is provided with two fourth avoidance holes (124); the two fourth avoidance holes (124) are respectively used to allow the first functional area (109a) and the second functional area (109b) to be exposed; and the center of the top cover (111) is located between the two fourth avoidance holes (124) in its orthographic projection on the insulating patch (120).

12. The single cell (100) according to claim 1, wherein: The functional area (109) corresponds to an identification code functional area, the avoidance hole (125) comprises a fourth avoidance hole (124), the fourth avoidance hole (124) is used to allow the functional area (109) to be exposed, and the positive projection of the identification code on the insulating patch (120) is located in the fourth avoidance hole (124).

13. The single cell (100) according to claim 1, wherein: The top cover (111) is provided with the functional area (109), the avoidance hole (125) includes a fourth avoidance hole (124), the fourth avoidance hole (124) is used to expose the functional area (109), the insulating patch (120) has a first direction (X) and a second direction (Y) perpendicular to each other, the insulating patch (120) includes two long sides (1) extending along the first direction (X), the two long sides (1) are arranged at intervals along the second direction (Y), the fourth avoidance hole (124) includes a center line extending along the first direction (X), the shortest distance from the center line to one of the long sides (1) is c, and the width of the insulating patch (120) along the second direction (Y) is w, wherein 0.1≤c / w≤0.

5.

14. A battery pack, wherein: It comprises the single cell (100) according to any one of claims 1 to 13.

15. The battery pack according to claim 14, wherein: The battery pack also includes a temperature sensor, which is connected to a side of the top cover (111) away from the bare battery cell (130); the functional area (109) corresponds to the temperature sensor for measuring the temperature of the single battery; the avoidance hole (125) includes a fourth avoidance hole (124), and the fourth avoidance hole (124) is used to expose the functional area (109); and the orthographic projection of the temperature sensor on the insulating patch (120) is located in the fourth avoidance hole (124).

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