Battery

Abstract

The invention relates to the technical field of batteries, and particularly discloses a battery which comprises a battery cover plate, a shell and a first plastic part, a first liquid injection hole in the battery cover plate or the shell is communicated with a second liquid injection hole in the first plastic part, and an annular flange is arranged in the circumferential direction of the second liquid injection hole. The annular flange is provided with a supporting part, the end face of the supporting part in the axial direction of the second liquid injection hole protrudes out of the annular flange, and the two ends of the supporting part in the radial direction of the second liquid injection hole protrude out of the annular flange. The supporting part can support the insulated rubber tape, a circulation space is formed between the insulated rubber tape and the first plastic part, electrolyte smoothly flows in the first liquid injection hole, the second liquid injection hole and the circulation space, the situation that the second liquid injection hole is blocked by the insulated rubber tape is avoided, and the liquid injection efficiency and the vacuumizing efficiency are high.

Description

Technical Field

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

[0002] As lithium-ion battery technology becomes increasingly mature, lithium-ion batteries are widely used as power batteries in electric vehicles and energy storage fields. As an accessory of lithium-ion batteries, the battery cover assembly first isolates the internal and external environments by welding with the shell to play a sealing role. Secondly, it connects the internal and external circuits and transmits the internal current of the battery to the outside through the pole of the battery cover assembly to play a conductive role. The traditional battery cover assembly generally includes a battery cover, a pole, an upper plastic part, and a lower plastic part. After the battery cover is welded to the shell, a closed space is formed between the battery cover and the shell, and the pole group 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 is connected to the pole ear of the pole group through a conductive connecting piece. After the conductive connecting piece is welded to the pole ear, the outer side of the connection area between the two is covered with a high-temperature insulating tape that is resistant to high temperature, thereby avoiding the welding mark and slag formed by the welding of the conductive connecting piece and the pole ear, and at the same time avoiding the risk of short circuit caused by the overlap of the pole ear and the shell.

[0003] like Figure 1 As shown, a truncated cone-shaped flow guide structure 12' is usually provided at the injection hole 11' of the lower plastic part 10'. The flow guide structure 12' is arranged in the circumference of the injection hole 11' and is coaxial with the injection hole 11'. During the battery production process, electrolyte is injected into the closed space surrounded by the shell and the battery cover through the injection hole 11', and the closed space is vacuumed through the injection hole 11' intermittently to discharge the gas in the closed space, so as to ensure that the injection amount of electrolyte in the closed space meets the needs. However, in order to rationally utilize the layout space of the battery cover assembly, the guide structure 12' on the lower plastic part 10' may be arranged above the connection area between the conductive connecting plate 20' and the pole ear. At this time, liquid is injected or vacuum is drawn through the injection hole 11', and the high-temperature insulating tape 30' may fit onto the guide structure 12', causing blockage of the injection hole 11', slowing down the injection rate and affecting production efficiency. In addition, when injecting liquid, the high-temperature insulating tape 30' is blocked 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 object of the present invention is to provide a battery, wherein the support portion on the first plastic part can support the insulating tape wrapped around the outer side of the tab and the connecting piece, thereby avoiding the second injection hole on the first plastic part from being blocked, ensuring smooth electrolyte injection, and high injection efficiency and vacuum extraction 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 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 structural schematic diagram of a battery cover assembly and an electrode 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 being assembled according to an embodiment of the present invention;

[0025] Figure 3 for Figure 2 A partial enlarged view of the middle A;

[0026] Figure 4 A bottom view of the battery cover and the first plastic part after being assembled in an embodiment of the present invention;

[0027] Figure 5 for Figure 4 A partial enlarged view of point B in the middle;

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

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

[0030] Figure 8 A cross-sectional view of a battery provided in an embodiment of the present invention;

[0031] Fig. 9 for Figure 8 A partial enlarged view of point C in the middle.

[0032] In the figure:

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

[0034] 100, battery cover; 110, first injection hole; 120, guide flange; 200, first plastic part; 210, second injection hole; 220, annular flange; 230, support part; 300, pole; 400, second plastic part; 410, connecting block; 500, shell; 600, pole group; 610, pole ear; 620, connecting piece; 630, insulating tape. DETAILED DESCRIPTION

[0035] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] In the description of the present invention, it should be noted that the orientations or positional relationships indicated by the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are 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 cannot be understood as limiting 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 "above", "above" and "above" the second feature include the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. The first feature "below", "below" and "below" the second feature include the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0037] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0039] like Figure 2-Figure 5 As shown, the present invention provides a battery, including a battery cover 100, a shell 500, an electrode group 600 and a first plastic part 200, the battery cover 100 and the shell 500 together form a receiving cavity for installing the electrode group 600 and the first plastic part 200, and one of the battery cover 100 and the shell 500 is provided with a first liquid injection hole 110.

[0040] In this embodiment, the first injection hole 110 is arranged on the battery cover 100 as an example for explanation. The first plastic part 200 is arranged on the side of the battery cover 100 close to the electrode group 600. The first plastic part 200 can insulate the electrode group 600 from the battery cover 100, and the electrode column 300 from the battery cover 100, and the electrode group 600 and the electrode column 300 are conductively connected. The first plastic part 200 is provided with a second injection hole 210 and an annular flange 220. The second injection hole 210 is coaxially arranged with the first injection hole 110 and is interconnected. The annular flange 220 is arranged around the circumference of the second injection hole 210; the annular flange 220 is provided with a support portion 230 extending along the radial direction of the second injection hole 210, and the support portion 230 is a rectangular parallelepiped. Along the axial direction of the second injection hole 210 ( Figure 2 The end surface of the support portion 230 protrudes from the end surface of the annular flange 220 close to the electrode group 600, and along the radial direction of the second injection hole 210 (Z-axis direction shown in Figure 2 The X-axis direction and the Y-axis direction shown in the figure are both radial directions of the second injection hole 210) both ends of the support part 230 protrude from the annular flange 220. When performing injection or vacuuming 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, and the insulating tape 630 will not block the second injection hole 210. The electrolyte can flow smoothly in the first injection hole 110, the second injection hole 210 and the flow space, the injection efficiency is high, and vacuuming is easy to achieve.

[0041] Furthermore, in this embodiment, the diameter of the first injection hole 110 on the battery cover 100 is φD, and the value range of φD is 2mm≤φD≤5mm. Exemplarily, the value of φD can be 2mm, 3mm, 4mm or 5mm. The diameter φD of the first injection hole 110 is controlled within the above range to ensure that the flow area of ​​the first injection hole 110 is large enough to meet the use requirements of injection and vacuuming when injecting or vacuuming.

[0042] The inner diameter of the annular flange 220 is φE, and φD and φE satisfy: 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. When the values ​​of φD and φE satisfy the above relationship, the inner diameter φE of the annular flange 220 is larger than φD, which facilitates the installation of the injection plug and also ensures that the injection plug has expansion space after penetrating the second injection hole 210, ensuring good sealing.

[0043] See also Figure 4 , Figure 5 and Figure 6, along the radial direction of the second injection hole 210, the dimension of the annular flange 220 protruding from the end of the support portion 230 away from the second injection hole 210 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 are not listed here one by one. 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 located on the outside of the annular flange 220, and to ensure that the flow space between the insulating tape 630 and the first plastic part 200 is large enough to meet the requirements of injection and vacuuming. Avoid the situation where the end of the support portion 230 away from the second injection hole 210 does not protrude from the annular flange 220 or the size of the protruding annular flange 220 is small. Figure 6 In the case where the insulating tape 630 wraps the outer side of the annular flange 220, the second injection hole 210 on the first plastic part 200 is blocked, and the electrolyte cannot flow.

[0044] See also Figure 4 , Figure 5 and Figure 7 , along the radial direction of the second injection hole 210, the dimension of the protruding annular flange 220 at one end of the support portion 230 close to the second injection hole 210 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 are not listed here one by one. 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 on the inner side of the annular flange 220, to ensure that the second injection hole 210 will not be blocked, thereby meeting the requirements of injection and vacuuming. Avoid the situation where the end of the support portion 230 close to the second injection hole 210 does not protrude from the annular flange 220 or the size of the protruding annular flange 220 is small. Figure 7 The insulating tape 630 shown in the figure protrudes toward the direction of the second liquid injection hole 210, blocking the second liquid injection hole 210, affecting the liquid injection efficiency and vacuuming efficiency. In severe cases, liquid may bubble out and vacuuming may become difficult.

[0045] See also Figure 8 and Fig. 9, along the axial direction of the second injection hole 210, the dimension of the end face of the support portion 230 close to the pole group 600 protruding from the end face of the annular flange 220 close to the pole 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 are not listed here one by one. 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, and the spacing distance between the insulating tape 630 and the second injection hole 210 is large, ensuring that the second injection hole 210 will not be blocked, and the flow space between the insulating tape 630 and the first plastic part 200 is large, thereby meeting the requirements of injection and vacuuming.

[0046] Furthermore, along the axial direction of the second injection hole 210, the dimension of the annular flange 220 protruding from the end face of the first plastic part 200 close to the pole 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 are not listed here one by one. Setting the value of f to be greater than or equal to 0.3mm, on the one hand, can facilitate demolding of the first plastic part 200 during injection molding, and on the other hand, it helps to improve the structural strength of the second injection hole 210 on the first plastic part 200, and avoid the structural strength of the first plastic part 200 After the second injection hole 210 is opened, it is easy to bend and deform the first plastic part 200.

[0047] Continue to see Figure 8 and Fig. 9 , a guide flange 120 is provided on the battery cover 100, and the guide flange 120 is located in the circumferential direction of the first injection hole 110, and the guide flange 120 extends into the second injection hole 210. Along the axial direction of the second injection hole 210, the spacing between the end face of the guide flange 120 close to the pole group 600 and the end face of the annular flange 220 away from the pole 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 are not listed here one by one. The value of g is set to be greater than or equal to 0.1mm in order to ensure that there is sufficient assembly clearance between the battery cover 100 and the first plastic part 200, so as to avoid interference between the two due to insufficient assembly clearance between the two, which affects the structural strength of the battery cover 100 after assembly.

[0048] Optionally, the electrode group 600 in this embodiment includes a pole ear 610 and a connecting piece 620. First, the connecting piece 620 is connected to the pole ear 610 by welding, and the connecting piece 620 is then welded to the pole column 300 on the battery cover 100, so that the pole group 600 is connected to the external circuit. The connecting area between the connecting piece 620 and the pole ear 610 is coated with an 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 injection hole 210, the projection of the insulating tape 630 on the first plastic part 200 covers the second injection hole 210. Along the axial direction of the second injection hole 210, the distance between the end face of the support part 230 close to the pole group 600 and the end face of the pole ear 610 away from the pole group 600 is h, and the value range of h is h≥0.1mm. For example, the value of h can be 0.1 mm, 0.2 mm, 0.3 mm, or 0.5 mm, etc., which are not listed here one by one. By setting the value of h to be greater than or equal to 0.1 mm, it is ensured that there is sufficient assembly clearance between the tab 610 and the first plastic part 200 to accommodate the insulating tape 630, and it is avoided that the insufficient assembly clearance between the two causes interference between the two, and then the insulating tape 630 is 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, causing the risk of short circuit.

[0049] Of course, in other embodiments, the pole group 600 includes a pole ear 610, which is directly connected to the pole post 300 on the battery cover 100 to connect the pole group 600 to the external circuit. The pole ear 610 is coated with an insulating tape 630. Along the axial direction of the second injection hole 210, the projection of the insulating tape 630 on the first plastic part 200 covers the second injection hole 210. Along the axial direction of the second injection hole 210, the distance between the end face of the support portion 230 close to the pole group 600 and the end face of the pole ear 610 away from the pole 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., which are not listed here one by one. The value of h is set to be greater than or equal to 0.1 mm in order to ensure that there is sufficient assembly clearance between the tab 610 and the first plastic part 200 to accommodate the insulating tape 630, so as to avoid interference between the two due to insufficient assembly clearance, and thus the insulating tape 630 being squeezed and worn during long-term use, which may cause the insulating tape 630 to rupture, and the tab 610 may contact the shell 500, causing 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 arranged on the side of the battery cover 100 away from the pole group 600, the connecting block 410 is located on the side of the second plastic part 400 away from the pole group 600 and is embedded in the receiving groove of the second plastic part 400, the pole 300 passes through the first plastic part 200, the battery cover 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 100, and the setting of the second plastic part 400 can ensure that the connecting block 410 and the battery cover 100 are insulated, thereby ensuring that the pole 300 and the end face of the battery cover 100 away from the pole group 600 are insulated.

[0051] Continue to see Figure 3 and Figure 5 In this embodiment, a plurality of support parts 230 are provided, and the plurality of support parts 230 are evenly spaced along the circumference of the annular flange 220, and each support part 230 extends along the radial direction of the second injection hole 210. By providing a plurality of support parts 230, a relatively uniform support force can be provided to the insulating tape 630 around the second injection hole 210, so as to avoid a situation where a certain position around the second injection hole 210 is blocked, resulting in poor flow of electrolyte. Exemplarily, the number of support parts 230 can be three, four, five, etc.

[0052] On the annular flange 220, a flow opening is formed between two adjacent support portions 230, and all the flow openings together form the above-mentioned flow space. In two adjacent support portions 230, the side surfaces of the two support portions 230 that are 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 injection hole 210) form two intersections, and the distance between the two intersections is x. It should be noted that the minimum flow area of ​​the flow opening is the flow area at the cross section where the two intersections are located (the cross section where the two intersections are located is parallel to Figure 4 The number of the support parts 230 is n, and the flow area of ​​the first injection hole 110 is S, wherein the relationship between x, n, c, S, and φD satisfies: ;

[0053] .

[0054] By adopting the above-mentioned size restriction, it is ensured that when the flow area of ​​the first injection hole 110 is large enough, the size of the flow space can match the flow area of ​​the first injection hole 110, meet the circulation needs of the electrolyte, ensure that the flow rate of the injected electrolyte is large, and there will be no electrolyte bubbling during rapid injection. In addition, the above-mentioned size restriction also ensures that the size of the support part 230 in the width direction is large, avoiding the insulation tape 630 being easily damaged when the size of the support part 230 in the width direction is small, causing the connection piece 620 and / or the pole ear 610 to be exposed. It should be noted that the support part 230 in this embodiment is a rectangular parallelepiped, and its length direction is the radial direction of the second injection hole 210, and its width direction is the direction perpendicular to the radial direction of the second injection hole 210.

[0055] In this embodiment, four support parts 230 are provided as an example. At this time, n=4, and the relationship between x, c, S, and φD satisfies: .

[0056] Of course, in other embodiments, other numbers of support parts 230 may also be provided, which will not be described in detail here.

[0057] In addition, in other embodiments, the first injection hole 110 can also be set on the housing 500. In this case, the first plastic part 200 is sandwiched between the electrode group 600 and the housing 500, and the second injection hole 210 on the first plastic part 200 is connected with the first injection hole 110 on the housing 500. The electrolyte can be injected into the accommodating cavity through the first injection hole 110 on the housing 500 and the second injection hole 210 on the first plastic part 200. And the insulating tape 630 can be well supported by the support part 230 on the first plastic part 200, avoiding the situation that the insulating tape 630 blocks the second injection hole 210, thereby ensuring that the battery is injected or vacuumed smoothly, which is conducive to rapid injection of electrolyte and rapid vacuuming with high efficiency.

[0058] The above size limit is verified by using batteries in some specific implementation schemes, wherein the first liquid injection hole 110 is set on the battery cover 100. The supporting part 230 of the first plastic part 200 in the battery is sampled 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 each battery is tested for liquid injection and vacuuming, and the results are shown in Table 1.

[0059] Table 1

[0060]

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

[0062] In Example 2, the value of parameter a is close to the lower limit of a≥0.3mm, and the other parameters b, c, φD, S, n and x are all normal values, slightly higher than the lower limits of their corresponding size limits. At this time, the insulating tape 630 does not block the second liquid injection hole 210, the liquid injection and vacuuming are relatively smooth, and the assembly efficiency is high.

[0063] In Example 3, the value of parameter b is close to the lower limit of b≥0.3mm, and the other parameters a, c, φD, S, n and x are all normal values, slightly higher than the lower limits of their corresponding size limits. At this time, the insulating tape 630 does not block the second liquid injection hole 210, the liquid injection and vacuuming are relatively smooth, and the assembly efficiency is high.

[0064] In Example 4, the value of parameter c is close to the lower limit of c ≥ 0.3 mm, and the other parameters a, b, φD, S, n and x are all normal values, slightly higher than the lower limits of their corresponding size limits. At this time, the insulating tape 630 does not block the second liquid injection hole 210, the liquid injection and vacuuming are relatively smooth, and the assembly efficiency is high.

[0065] In Example 5, the parameters x, n, c, S, and φD satisfy , but the value of x is relatively small, and the other parameters a, b, c, n, S, φD are all normal values, slightly higher than the lower limit of their corresponding size restrictions. At this time, the insulating tape 630 does not block the second liquid injection hole 210, the liquid injection and vacuuming are relatively smooth, and the assembly efficiency is high.

[0066] In Example 6, all parameters a, b, c, φD, S, n and x are normal values, slightly higher than the lower limit of their corresponding size restrictions. At this time, the insulating tape 630 does not block the second liquid injection hole 210, the liquid injection and vacuuming are relatively smooth, and the assembly efficiency is high.

[0067] Referring to Comparative Example 1, the value of parameter a exceeds the lower limit of a≥0.3mm, and the other parameters b, c, φD, S, n and x are all normal values. However, the insulating tape 630 obviously blocks the second liquid injection hole 210, making liquid injection and vacuuming difficult, and the production is delayed by 45s, affecting the production cycle and reducing the assembly efficiency.

[0068] Referring to Comparative Example 2, the value of parameter b exceeds the lower limit of b≥0.3mm, and the other parameters b, c, φD, S, n and x are all normal values. However, the insulating tape 630 obviously blocks the second liquid injection hole 210, making liquid injection and vacuuming difficult, and there is liquid bubbling during liquid injection, resulting in a production delay of 110s, which seriously affects the production cycle and reduces assembly efficiency.

[0069] Referring to Comparative Example 3, the value of parameter c exceeds the lower limit of c ≥ 0.3 mm, and the other parameters a, b, φD, S, n and x are all normal values. However, the insulating tape 630 obviously blocks the second liquid injection hole 210, making liquid injection and vacuuming difficult, and there is liquid bubbling during liquid injection, resulting in a production delay of 65 seconds, affecting the production cycle and reducing 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 opening formed between two adjacent support parts 230 on the first plastic part 200 is small, and the flow space between the insulating tape 630 and the first plastic part 200 is insufficient, resulting in poor liquid injection and vacuum extraction, a production delay of 25s-40s, affecting the production rhythm and reducing 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 size limits, it can be ensured that the insulating tape 630 does not block the second injection hole 210, and there is sufficient circulation space between the insulating tape 630 and the first plastic part 200, the injection and vacuuming are smooth, and the assembly efficiency is high.

[0072] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled 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 embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should 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.

2. The battery according to claim 1, characterized in that 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.

3. The battery according to claim 1, characterized in that 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.

4. The battery according to claim 1, characterized in that Along the axial direction of the second liquid injection hole, the dimension of the support portion protruding from the annular flange is c, and the value range of c is c≥0.3 mm.

5. 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.

6. 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.

7. The battery according to claim 6, 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.

8. The battery according to claim 6, 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.

9. The battery according to claim 1, characterized in that A plurality of the support portions are provided, and the plurality of the support portions are evenly spaced along the circumference of the annular flange.

10. The battery according to claim 9, characterized in that 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: ; 。

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