A battery

Abstract

The present invention relates to the technical field of batteries, and specifically discloses a battery. The battery includes a battery cover plate, a housing, and a first plastic part. A first liquid injection hole on the battery cover plate or the housing communicates with a second liquid injection hole on the first plastic part. A ring-shaped flange is provided circumferentially of the second liquid injection hole. A support portion is provided on the ring-shaped flange. The end face of the support portion protrudes from the ring-shaped flange along the axial direction of the second liquid injection hole, and both ends of the support portion protrude from the ring-shaped flange along the radial direction of the second liquid injection hole. The support portion can support an insulating tape and form a flow space between the insulating tape and the first plastic part. The electrolyte flows smoothly in the first liquid injection hole, the second liquid injection hole, and the flow space, avoiding the situation that the insulating tape blocks the second liquid injection hole, and the liquid injection and vacuum pumping efficiency is relatively high.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and particularly to a battery. Background Art

[0002] With the increasing maturity of lithium-ion battery technology, lithium-ion batteries are widely used as power batteries in electric vehicles and energy storage fields. As a component of a lithium-ion battery, a battery cover assembly first isolates the internal and external environments by welding with a housing to play a sealing role. Secondly, it connects the internal and external circuits and conveys the current inside the battery to the outside through the pole posts of the battery cover assembly, playing a conductive role. A traditional battery cover assembly generally includes a battery cover, pole posts, an upper plastic part, and a lower plastic part. After the battery cover is welded to the housing, a closed space is formed between the battery cover and the housing, and the electrode assembly is arranged in the closed space. In order to inject electrolyte into the closed space, injection holes are generally provided on the battery cover and the lower plastic part. The pole posts are connected to the electrode tabs of the electrode assembly through conductive connecting pieces. After the conductive connecting piece is welded to the electrode tab, the outside of the connection area between the two is coated with a high-temperature insulating tape that can withstand high temperatures, so as to avoid slag falling from the welding mark formed by welding the conductive connecting piece to the electrode tab and at the same time avoid the risk of short circuit caused by the electrode tab overlapping with the housing.

[0003] As Figure 1 shown, a conical diversion structure 12' is usually provided at the injection hole 11' of the lower plastic part 10'. The diversion structure 12' is arranged circumferentially around the injection hole 11' and is coaxial with the injection hole 11'. During the battery production process, electrolyte is injected into the closed space formed by the housing and the battery cover through the injection hole 11', and the closed space is intermittently evacuated through the injection hole 11' to discharge the gas in the closed space and ensure that the injection volume of the electrolyte in the closed space meets the requirements. However, in order to rationally utilize the layout space of the battery cover assembly, the diversion structure 12' on the lower plastic part 10' may be arranged above the connection area between the conductive connecting piece 20' and the electrode tab. At this time, when injecting or evacuating through the injection hole 11', the high-temperature insulating tape 30' may adhere to the diversion structure 12', blocking the injection hole 11', slowing down the injection rate, and affecting the production efficiency. In addition, when injecting, there is a high-temperature insulating tape 30' blocking below the injection hole 11' of the lower plastic part 10', which will cause an alarm on the production line. Summary of the Invention

[0004] The purpose of the present invention is to provide a battery, in which a support part on the first plastic part can support the insulating tape covering the outside of the electrode tab and the connecting piece, thereby avoiding blockage of the second injection hole on the first plastic part, ensuring smooth electrolyte injection, and having relatively high injection efficiency and vacuum evacuation efficiency.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] The present invention provides a battery, comprising a battery cover and a shell, wherein the battery cover and the shell together form a containing cavity, and one of the battery cover and the shell is provided with a first liquid injection hole;

[0007] A first plastic part is arranged on a side of the battery cover or the shell facing the accommodating cavity, the first plastic part is provided with a second injection hole and an annular flange, the second injection hole is communicated with the first injection hole, and the annular flange is arranged around the circumference of the second injection hole; the annular flange is provided with a support portion extending in the radial direction of the second injection hole, the end surface of the support portion in the axial direction of the second injection hole protrudes from the annular flange, and both ends of the support portion in the radial direction of the second injection hole protrude from the annular flange;

[0008] The diameter of the first injection hole is φD, the inner diameter of the annular flange is φE, φD and φE satisfy: 1.1≤φE / φD≤2.6, and the value range of φD is 2mm≤φD≤5mm.

[0009] Optionally, along the radial direction of the second liquid injection hole, a dimension of the end of the support portion away from the second liquid injection hole protruding from the annular flange is a, and a has a value range of a≥0.3 mm.

[0010] Optionally, along the radial direction of the second liquid injection hole, a dimension of the end of the support portion close to the second liquid injection hole protruding from the annular flange is b, and a value range of b is b≥0.3 mm.

[0011] Optionally, along the axial direction of the second liquid injection hole, a dimension of the support portion protruding from the annular flange is c, and a value range of c is c≥0.3 mm.

[0012] Optionally, along the axial direction of the second liquid injection hole, the dimension of the annular flange protruding from the first plastic part is f, and the value range of f is f≥0.3 mm.

[0013] Optionally, a first injection hole is provided on the battery cover, a pole group is provided on the side of the first plastic part facing away from the battery cover, a guide flange is provided on the battery cover, the guide flange is located in the circumference of the first injection hole, and the guide flange extends into the second injection hole; along the axial direction of the second injection hole, the spacing between the end face of the guide flange close to the pole group and the end face of the annular flange facing away from the pole group is g, and the value range of g satisfies g≥0.1mm.

[0014] Optionally, the electrode group has a pole ear, and along the axial direction of the second injection hole, the distance between the end surface of the support portion close to the electrode group and the end surface of the pole ear away from the electrode group is h, and the value range of h is h≥0.1mm.

[0015] Optionally, the pole group has a pole ear and a connecting plate, the connecting plate is connected to the pole ear, and the connecting plate is located on a side close to the first plastic part. Along the axial direction of the second injection hole, the spacing between the end face of the support portion close to the pole group and the end face of the pole ear away from the pole group is h, and the value range of h is h≥0.1mm.

[0016] Optionally, a plurality of the support portions are provided, and the plurality of the support portions are evenly spaced apart along the circumference of the annular flange.

[0017] Optionally, in two adjacent support parts, the side surfaces of the two support parts close to each other form two intersections with the inner edge of the annular flange, the distance between the two intersections is x, the number of the support parts is n, the flow area of ​​the first injection hole is S,

[0018] Among them, the relationship between x, n, c, S, and φD satisfies: ;

[0019] .

[0020] The beneficial effects of the present invention are:

[0021] The present invention provides a battery, including a battery cover, a shell and a first plastic part. The battery cover and the shell together form an accommodating cavity, and one of the battery cover and the shell is provided with a first injection hole. The first plastic part is arranged on one side of the battery cover or the shell, the first injection hole on the battery cover or the shell is connected with the second injection hole on the first plastic part, and an annular flange is arranged in the circumference of the second injection hole. A support portion extending in the radial direction of the second injection hole is provided on the annular flange, the end face of the support portion in the axial direction of the second injection hole protrudes from the annular flange, and both ends of the support portion in the radial direction of the second injection hole protrude from the annular flange. Thus, the insulating tape can be supported by the support portion, so that a circulation space is formed between the insulating tape and the first plastic part, ensuring that the electrolyte can flow smoothly in the first injection hole, the second injection hole and the circulation space, and the injection and vacuuming efficiency are high.

[0022] In addition, the diameter of the first injection hole is φD, and the value range of φD is 2mm≤φD≤5mm. The inner diameter of the annular flange is φE, and the relationship between φD and φE satisfies: 1.1≤φE / φD≤2.6. This ensures that when injecting liquid or vacuuming, the flow area of ​​the first injection hole is large enough to meet the use requirements of injection and vacuuming, and is convenient for installing the injection plug. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic structural diagram of a battery cover plate assembly and a pole group in the prior art;

[0024] Figure 2 It is a schematic structural diagram of the battery cover plate and the first plastic part after assembly according to an embodiment of the present invention;

[0025] Figure 3 is Figure 2 The partial enlarged view at A in;

[0026] Figure 4 It is a bottom view of the battery cover plate and the first plastic part after assembly according to an embodiment of the present invention;

[0027] Figure 5 is Figure 4 The partial enlarged view at B in;

[0028] Figure 6 It is a schematic structural diagram of the first plastic part (a does not meet the requirements) provided in an embodiment of the present invention;

[0029] Figure 7 It is a schematic structural diagram of the first plastic part (b does not meet the requirements) provided in an embodiment of the present invention;

[0030] Figure 8 It is a sectional view of the battery provided in an embodiment of the present invention;

[0031] Figure 9 is Figure 8 The partial enlarged view at C in.

[0032] In the figure:

[0033] 10’, lower plastic part; 11’, liquid injection hole; 12’, flow guiding structure; 20’, conductive connecting piece; 30’, high-temperature insulating tape;

[0034] 100, battery cover plate; 110, first liquid injection hole; 120, guiding flange; 200, first plastic part; 210, second liquid injection hole; 220, annular flange; 230, supporting part; 300, pole column; 400, second plastic part; 410, connecting block; 500, housing; 600, pole group; 610, pole ear; 620, connecting piece; 630, insulating tape. Detailed implementation manners

[0035] Next, the technical solutions of the present invention will be clearly and completely described in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0036] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention 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 construed as a limitation of the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions, and the first feature being "above", "over" and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature has a higher horizontal height than the second feature. The first feature being "below", "under" and "beneath" the second feature includes the first feature being directly below and obliquely below the second feature, or simply indicating that the first feature has a lower horizontal height than the second feature.

[0037] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "mounted", "connected" and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] The embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the drawings, where the same or similar reference numerals indicate the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation of the present invention.

[0039] As Figures 2 - 5 shown, the present invention provides a battery, which includes a battery cover plate 100, a housing 500, a pole group 600 and a first plastic part 200. The battery cover plate 100 and the housing 500 jointly enclose a receiving cavity for mounting the pole group 600 and the first plastic part 200, and one of the battery cover plate 100 and the housing 500 is provided with a first liquid injection hole 110.

[0040] In this embodiment, the first liquid injection hole 110 is provided on the battery cover plate 100 as an example for illustration. The first plastic part 200 is arranged on the side of the battery cover plate 100 close to the electrode group 600. Through the first plastic part 200, insulation can be achieved between the electrode group 600 and the battery cover plate 100, and between the electrode post 300 and the battery cover plate 100. The electrode group 600 is electrically connected to the electrode post 300. The first plastic part 200 is provided with a second liquid injection hole 210 and an annular flange 220. The second liquid injection hole 210 is coaxially arranged with and communicates with the first liquid injection hole 110. The annular flange 220 is arranged around the circumference of the second liquid injection hole 210. A support part 230 extending in the radial direction of the second liquid injection hole 210 is provided on the annular flange 220. The support part 230 is a cuboid. Along the axial direction of the second liquid injection hole 210 ( Figure 2 the Z-axis direction shown in), the end face of the support part 230 protrudes from the end face of the annular flange 220 on the side close to the electrode group 600. Along the radial direction of the second liquid injection hole 210 ( Figure 2 both the X-axis direction and the Y-axis direction shown in are the radial directions of the second liquid injection hole 210), both ends of the support part 230 protrude from the annular flange 220. During liquid injection or vacuum pumping operations, the support part 230 can support the insulating tape 630, thereby forming a flow space between the insulating tape 630 and the first plastic part 200. The insulating tape 630 will not block the second liquid injection hole 210, and the electrolyte can flow smoothly in the first liquid injection hole 110, the second liquid injection hole 210, and the flow space. The liquid injection efficiency is relatively high, and vacuum pumping is easy to achieve.

[0041] Furthermore, in this embodiment, the diameter of the first liquid injection hole 110 on the battery cover plate 100 is φD, and the value range of φD is 2 mm ≤ φD ≤ 5 mm. Exemplarily, the value of φD can be 2 mm, 3 mm, 4 mm, or 5 mm. Controlling the diameter φD of the first liquid injection hole 110 within the above range is to ensure that the flow area of the first liquid injection hole 110 is large enough during liquid injection or vacuum pumping to meet the usage requirements of liquid injection and vacuum pumping.

[0042] The inner diameter of the annular flange 220 is φE, and the relationship between φD and φE satisfies: 1.1 ≤ φE / φD ≤ 2.6. For example, the value of φE / φD can be 1.1, 1.5, 1.8, 2.0, 2.3, or 2.6, etc. When the values of φD and φE satisfy the above relationship, the inner diameter dimension φE of the annular flange 220 is greater than φD, which is convenient for installing the liquid injection plug. At the same time, it also ensures that the liquid injection plug has an expansion space after passing through the second liquid injection hole 210, ensuring good sealing.

[0043] See Figure 4 、 Figure 5 and Figure 6, along the radial direction of the second liquid injection hole 210, the dimension of the end of the support portion 230 away from the second liquid injection hole 210 protruding from the annular flange 220 is a, and the value range of a is a≥0.3mm. Exemplarily, the value of a can be 0.3mm, 0.5mm, 0.8mm, or 1.0mm, etc., which will not be listed one by one here. By setting the value of a to be greater than or equal to 0.3mm, it is to enable the support portion 230 to provide good support for the insulating tape 630 outside the annular flange 220, ensuring that the flow space between the insulating tape 630 and the first plastic part 200 is large enough to meet the requirements of liquid injection and vacuum pumping. To avoid the situation where the end of the support portion 230 away from the second liquid injection hole 210 does not protrude from the annular flange 220 or the protruding dimension from the annular flange 220 is small, there will be Figure 6 the situation shown in, where the insulating tape 630 wraps the outside of the annular flange 220, and the second liquid injection hole 210 on the first plastic part 200 is blocked, preventing the electrolyte from flowing.

[0044] See Figure 4 , Figure 5 and Figure 7 , along the radial direction of the second liquid injection hole 210, the dimension of the end of the support portion 230 close to the second liquid injection hole 210 protruding from the annular flange 220 is b, and the value range of b is b≥0.3mm. Exemplarily, the value of b can be 0.3mm, 0.5mm, 0.8mm, or 1.0mm, etc., which will not be listed one by one here. By setting the value of b to be greater than or equal to 0.3mm, it is to enable the support portion 230 to provide good support for the insulating tape 630 inside the annular flange 220, ensuring that the second liquid injection hole 210 will not be blocked, so as to meet the requirements of liquid injection and vacuum pumping. To avoid the situation where the end of the support portion 230 close to the second liquid injection hole 210 does not protrude from the annular flange 220 or the protruding dimension from the annular flange 220 is small, there will be Figure 7 the situation shown in, where the insulating tape 630 bulges towards the direction where the second liquid injection hole 210 is located, blocking the second liquid injection hole 210, affecting the liquid injection efficiency and vacuum pumping efficiency, and in severe cases, liquid overflow and difficult vacuum pumping may occur.

[0045] See Figure 8 and Figure 9, along the axial direction of the second liquid injection hole 210, the dimension of the end face of the support portion 230 closer to the electrode group 600 protruding from the end face of the annular flange 220 closer to the electrode group 600 is c, and the value range of c is c≥0.3mm. Exemplarily, the value of c can be 0.3mm, 0.5mm, 0.8mm, or 1.0mm, etc., which will not be listed one by one here. By setting the value of c to be greater than or equal to 0.3mm, it is to enable the support portion 230 to provide good support for the insulating tape 630. The spacing distance between the insulating tape 630 and the second liquid injection hole 210 is large, ensuring that the second liquid injection hole 210 will not be blocked, and the flow space between the insulating tape 630 and the first plastic part 200 is large, thus meeting the requirements for liquid injection and vacuum pumping.

[0046] Furthermore, along the axial direction of the second liquid injection hole 210, the dimension of the annular flange 220 protruding from the end face of the first plastic part 200 closer to the electrode group 600 is f, and the value range of f is f≥0.3mm. Exemplarily, the value of f can be 0.3mm, 0.5mm, 0.8mm, or 1.0mm, etc., which will not be listed one by one here. Setting the value of f to be greater than or equal to 0.3mm, on the one hand, can facilitate the demolding of the first plastic part 200 during injection molding, and on the other hand, helps to improve the structural strength of the second liquid injection hole 210 on the first plastic part 200, avoiding the decrease in the structural strength of the first plastic part 200 after the second liquid injection hole 210 is opened, resulting in the first plastic part 200 being prone to bending deformation.

[0047] Continue to refer to Figure 8 and Figure 9 , the battery cover plate 100 is provided with a guiding flange 120, the guiding flange 120 is located in the circumferential direction of the first liquid injection hole 110, and the guiding flange 120 extends into the second liquid injection hole 210. Along the axial direction of the second liquid injection hole 210, the spacing between the end face of the guiding flange 120 closer to the electrode group 600 and the end face of the annular flange 220 facing away from the electrode group 600 is g, and the value range of g satisfies g≥0.1mm. Exemplarily, the value of g can be 0.1mm, 0.2mm, 0.3mm, or 0.5mm, etc., which will not be listed one by one here. Setting the value of g to be greater than or equal to 0.1mm is to ensure that there is enough assembly clearance between the battery cover plate 100 and the first plastic part 200, avoiding interference between the two due to insufficient assembly clearance and affecting the structural strength of the battery cover plate 100 after assembly.

[0048] Optionally, the electrode group 600 in this embodiment includes tab 610 and connecting piece 620. First, the connecting piece 620 is welded to the tab 610, and then the connecting piece 620 is welded to the terminal 300 on the battery cover plate 100 to connect the electrode group 600 to the external circuit. The connection area between the connecting piece 620 and the tab 610 is covered with insulating tape 630, and the connecting piece 620 is located on the side close to the first plastic part 200. Along the axial direction of the second liquid injection hole 210, the projection of the insulating tape 630 on the first plastic part 200 covers the second liquid injection hole 210. Along the axial direction of the second liquid injection hole 210, the distance between the end face of the support part 230 close to the electrode group 600 and the end face of the tab 610 facing away from the electrode group 600 is h, and the value range of h is h≥0.1mm. Exemplarily, the value of h can be 0.1mm, 0.2mm, 0.3mm, or 0.5mm, etc., and will not be listed one by one here. By setting the value of h to be greater than or equal to 0.1mm, it is ensured that there is enough assembly clearance between the tab 610 and the first plastic part 200 to accommodate the insulating tape 630, avoiding interference between the two due to insufficient assembly clearance, and further preventing the insulating tape 630 from being squeezed and worn during long-term use, which may cause the insulating tape 630 to break, and the welding slag at the weld between the tab 610 and the connecting piece 620 may fall off, triggering a short-circuit risk.

[0049] Certainly, in other embodiments, the electrode group 600 includes tab 610, and the tab 610 is directly connected to the terminal 300 on the battery cover plate 100 to connect the electrode group 600 to the external circuit. The tab 610 is covered with insulating tape 630. Along the axial direction of the second liquid injection hole 210, the projection of the insulating tape 630 on the first plastic part 200 covers the second liquid injection hole 210. Along the axial direction of the second liquid injection hole 210, the distance between the end face of the support part 230 close to the electrode group 600 and the end face of the tab 610 facing away from the electrode group 600 is h, and the value range of h is h≥0.1mm. Exemplarily, the value of h can be 0.1mm, 0.2mm, 0.3mm, or 0.5mm, etc., and will not be listed one by one here. Setting the value of h to be greater than or equal to 0.1mm is to ensure that there is enough assembly clearance between the tab 610 and the first plastic part 200 to accommodate the insulating tape 630, avoiding interference between the two due to insufficient assembly clearance, and further preventing the insulating tape 630 from being squeezed and worn during long-term use, which may cause the insulating tape 630 to break, and the tab 610 may come into contact with the housing 500, triggering a short-circuit risk.

[0050] Optionally, the battery further includes a second plastic part 400 and a connecting block 410. The second plastic part 400 is disposed on the side of the battery cover plate 100 away from the electrode group 600. The connecting block 410 is located on the side of the second plastic part 400 away from the electrode group 600 and is embedded in the accommodating groove of the second plastic part 400. The pole column 300 passes through the first plastic part 200, the battery cover plate 100, the second plastic part 400 and the connecting block 410 and is riveted to the connecting block 410. The second plastic part 400 is clamped between the connecting block 410 and the battery cover plate 100. By providing the second plastic part 400, insulation between the connecting block 410 and the battery cover plate 100 can be ensured, and further insulation between the pole column 300 and the end face of the battery cover plate 100 on the side away from the electrode group 600 can be achieved.

[0051] Continuing to refer to Figure 3 and Figure 5 , in this embodiment, a plurality of supporting portions 230 are provided. The plurality of supporting portions 230 are evenly spaced along the circumferential direction of the annular flange 220, and each supporting portion 230 extends along the radial direction of the second liquid injection hole 210. By providing a plurality of supporting portions 230, a relatively uniform supporting force can be provided for the insulating tape 630 in the circumferential direction of the second liquid injection hole 210, avoiding the situation where a certain position in the circumferential direction of the second liquid injection hole 210 is blocked, resulting in poor electrolyte flow. Exemplarily, the number of the supporting portions 230 can be three, four, five, etc.

[0052] On the annular flange 220, a flow-through opening is formed between two adjacent supporting portions 230, and all the flow-through openings together form the above-mentioned flow-through space. Among two adjacent supporting portions 230, the side surfaces of the two supporting portions 230 close to each other and the inner edge of the annular flange 220 (i.e., the side of the annular flange 220 close to the second liquid injection hole 210) form two intersection points, and the distance between the two intersection points is x. It should be noted that the minimum flow-through area of the flow-through opening is the flow-through area at the cross-section where the two intersection points are located (the cross-section where the two intersection points are located is parallel to Figure 4 the Y-Z plane shown in). The number of the supporting portions 230 is n, and the flow-through area of the first liquid injection hole 110 is S. Among them, the relationship between x, n, c, S, and φD satisfies: ;

[0053] .

[0054] By adopting the above-mentioned size restrictions, it is ensured that when the flow area of the first liquid injection hole 110 is large enough, the size of the flow space can match the flow area of the first liquid injection hole 110, meet the flow requirements of the electrolyte, ensure a relatively large flow rate of the injected electrolyte, and prevent the electrolyte from overflowing during rapid liquid injection. In addition, the above-mentioned size restrictions also ensure that the size of the support portion 230 in the width direction is large, avoiding damage to the insulating tape 630 when the size of the support portion 230 in the width direction is small, resulting in the exposure of the connecting piece 620 and / or the tab 610. It should be noted that in this embodiment, the support portion 230 is a cuboid, the length direction thereof is the radial direction of the second liquid injection hole 210, and the width direction thereof is the direction perpendicular to the radial direction of the second liquid injection hole 210.

[0055] In this embodiment, taking the setting of four support portions 230 as an example for illustration. At this time, n = 4, and the relationship among x, c, S, and φD satisfies: .

[0056] Of course, in other embodiments, other numbers of support portions 230 may also be set, which will not be elaborated here one by one.

[0057] In addition, in other embodiments, the first liquid injection hole 110 may also be provided on the housing 500. At this time, the first plastic part 200 is clamped between the electrode group 600 and the housing 500, and the second liquid injection hole 210 on the first plastic part 200 communicates with the first liquid injection hole 110 on the housing 500. The electrolyte can be injected into the accommodation cavity through the first liquid injection hole 110 on the housing 500 and the second liquid injection hole 210 on the first plastic part 200. And the insulating tape 630 can be well supported by the support portion 230 on the first plastic part 200, avoiding the situation that the insulating tape 630 blocks the second liquid injection hole 210, thereby ensuring the smooth progress of battery liquid injection or vacuum pumping, facilitating the rapid injection of electrolyte, and rapid vacuum pumping, with high efficiency.

[0058] Next, the above-mentioned size restrictions are verified with batteries in some specific implementation schemes, and the first liquid injection hole 110 is provided on the battery cover 100. By making samples of the support portion 230 of the first plastic part 200 in the battery with different size parameters. Then, each battery cover 100, the first plastic part 200 and the housing 500 are assembled to form a battery, and liquid injection and vacuum pumping tests are carried out on each battery. The results are shown in Table 1.

[0059] Table 1

[0060]

[0061] As can be seen from the above results, in Example 1, the parameters a, b, c, φD, S, n, and x are all close to the lower limits of their respective dimensional limits. At this time, the insulating tape 630 does not block the second liquid injection hole 210, and the liquid injection and vacuum pumping are both relatively smooth, and the assembly efficiency is relatively high.

[0062] In Example 2, the value of parameter a is close to the lower limit of a≥0.3mm, and the remaining parameters b, c, φD, S, n, and x are all normally valued, slightly higher than the lower limits of their respective dimensional limits. At this time, the insulating tape 630 does not block the second liquid injection hole 210, and the liquid injection and vacuum pumping are both relatively smooth, and the assembly efficiency is relatively high.

[0063] In Example 3, the value of parameter b is close to the lower limit of b≥0.3mm, and the remaining parameters a, c, φD, S, n, and x are all normally valued, slightly higher than the lower limits of their respective dimensional limits. At this time, the insulating tape 630 does not block the second liquid injection hole 210, and the liquid injection and vacuum pumping are both relatively smooth, and the assembly efficiency is relatively high.

[0064] In Example 4, the value of parameter c is close to the lower limit of c≥0.3mm, and the remaining parameters a, b, φD, S, n, and x are all normally valued, slightly higher than the lower limits of their respective dimensional limits. At this time, the insulating tape 630 does not block the second liquid injection hole 210, and the liquid injection and vacuum pumping are both relatively smooth, and the assembly efficiency is relatively high.

[0065] In Example 5, the parameters x, n, c, S, and φD satisfy , but the value of x is relatively small, and the remaining parameters a, b, c, n, S, and φD are all normally valued, slightly higher than the lower limits of their respective dimensional limits. At this time, the insulating tape 630 does not block the second liquid injection hole 210, and the liquid injection and vacuum pumping are both relatively smooth, and the assembly efficiency is relatively high.

[0066] In Example 6, all the parameters a, b, c, φD, S, n, and x are normally valued, slightly higher than the lower limits of their respective dimensional limits. At this time, the insulating tape 630 does not block the second liquid injection hole 210, and the liquid injection and vacuum pumping are both relatively smooth, and the assembly efficiency is relatively high.

[0067] Referring to Comparative Example 1, the value of its parameter a exceeds the lower limit of a≥0.3mm, and the remaining parameters b, c, φD, S, n, and x are all normally valued. However, at this time, the insulating tape 630 significantly blocks the second liquid injection hole 210, the liquid injection and vacuum pumping are difficult, the production is delayed by 45s, the production rhythm is affected, and the assembly efficiency is reduced.

[0068] Referring to Comparative Example 2, the value of parameter b exceeds the lower limit of b≥0.3 mm, and the remaining parameters b, c, φD, S, n, and x are all within their normal ranges. However, at this time, the insulating tape 630 significantly obstructs the second liquid injection hole 210, making liquid injection and vacuum pumping difficult, and there is a liquid overflow phenomenon during liquid injection. The production is delayed by 110 s, seriously affecting the production rhythm and reducing the assembly efficiency.

[0069] Referring to Comparative Example 3, the value of parameter c exceeds the lower limit of c≥0.3 mm, and the remaining parameters a, b, φD, S, n, and x are all within their normal ranges. However, at this time, the insulating tape 630 significantly obstructs the second liquid injection hole 210, making liquid injection and vacuum pumping difficult, and there is a liquid overflow phenomenon during liquid injection. The production is delayed by 65 s, affecting the production rhythm and reducing the assembly efficiency.

[0070] Referring to Comparative Examples 4, 5, and 6, the parameters x, n, c, S, and φD do not satisfy . At this time, the flow port formed between two adjacent support portions 230 on the first plastic part 200 is relatively small, and the flow space between the insulating tape 630 and the first plastic part 200 is insufficient, resulting in unsmooth liquid injection and vacuum pumping. The production is delayed by 25 s - 40 s, affecting the production rhythm and reducing the assembly efficiency.

[0071] In summary, it can be seen that when the above parameters a, b, c, φD, S, n, and x are all within their corresponding dimensional limits, it can be ensured that the insulating tape 630 does not obstruct the second liquid injection hole 210, and there is sufficient flow space between the insulating tape 630 and the first plastic part 200, the liquid injection and vacuum pumping are smooth, and the assembly efficiency is high.

[0072] Obviously, the above-mentioned embodiments of the present invention are merely examples for clearly illustrating the present invention, rather than limiting the implementation manners of the present invention. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation manners here. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A battery, characterized in that: include: A battery cover plate and a shell, wherein the battery cover plate and the shell together enclose a containing cavity, and one of the battery cover plate and the shell is provided with a first liquid injection hole; A first plastic part, arranged on a side of the battery cover or the shell facing the accommodating cavity, the first plastic part is provided with a second liquid injection hole and an annular flange, the second liquid injection hole is communicated with the first liquid injection hole, and the annular flange is arranged around the circumference of the second liquid injection hole; The annular flange is provided with a support portion extending in the radial direction of the second liquid injection hole, the end surface of the support portion in the axial direction of the second liquid injection hole protrudes from the annular flange, and both ends of the support portion in the radial direction of the second liquid injection hole protrude from the annular flange; The diameter of the first injection hole is φD, the inner diameter of the annular flange is φE, φD and φE satisfy: 1.1≤φE / φD≤2.6, and the value range of φD is 2mm≤φD≤5mm; Along the radial direction of the second liquid injection hole, the dimension of the end of the support portion away from the second liquid injection hole protruding from the annular flange is a, and the value range of a is a≥0.3mm; along the radial direction of the second liquid injection hole, the dimension of the end of the support portion close to the second liquid injection hole protruding from the annular flange is b, and the value range of b is b≥0.3mm; along the axial direction of the second liquid injection hole, the dimension of the end surface of the support portion protruding from the annular flange is c, and the value range of c is c≥0.3mm; The support parts are provided in plurality, and the plurality of support parts are evenly spaced along the circumference of the annular flange. In two adjacent support parts, the side surfaces of the two support parts close to each other form two intersections with the inner edge of the annular flange. The distance between the two intersections is x. The number of the support parts is n. The flow area of ​​the first injection hole is S. Among them, the relationship between x, n, c, S, and φD satisfies: ; 。 2. The battery according to claim 1, characterized in that Along the axial direction of the second injection hole, the dimension of the annular flange protruding from the first plastic part is f, and the value range of f is f≥0.3 mm.

3. The battery according to claim 1, characterized in that A first injection hole is provided on the battery cover plate, a pole group is provided on the side of the first plastic part facing away from the battery cover plate, a guide flange is provided on the battery cover plate, the guide flange is located in the circumference of the first injection hole, and the guide flange extends into the second injection hole; along the axial direction of the second injection hole, the spacing between the end face of the guide flange close to the pole group and the end face of the annular flange facing away from the pole group is g, and the value range of g satisfies g≥0.1mm.

4. The battery according to claim 3, characterized in that The electrode group has an electrode ear. Along the axial direction of the second injection hole, the distance between the end surface of the support portion close to the electrode group and the end surface of the electrode ear away from the electrode group is h, and the value range of h is h≥0.1mm.

5. The battery according to claim 3, characterized in that The pole group has a pole ear and a connecting piece, the connecting piece is connected to the pole ear, and the connecting piece is located on a side close to the first plastic part. Along the axial direction of the second injection hole, the spacing between the end face of the support portion close to the pole group and the end face of the pole ear away from the pole group is h, and the value range of h is h≥0.1mm.

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