Battery cover plate assembly and battery

Abstract

The invention relates to the technical field of batteries, and particularly discloses a battery cover plate assembly and a battery, a first plastic part and a second plastic part of the battery cover plate assembly are respectively arranged on two sides of a cover plate body, and a pole is arranged on one side, deviating from the cover plate body, of the first plastic part. The first plastic part is provided with a first through hole, the second plastic part is provided with a second through hole, and a first flange in the circumferential direction of the first through hole and a second flange in the circumferential direction of the second through hole extend into the first mounting hole of the cover plate body to be connected. Tabs of the pole group penetrate through the second through holes, the first mounting holes and the first through holes and then are connected with the pole columns. After the battery cover plate assembly and the shell are assembled, the pole is located outside the shell and does not occupy the internal space of the shell, the thickness of the second plastic part is small, the internal space of the shell is saved, the size of the pole group is large, and the energy density of the battery can be improved. Besides, two layers of insulation structures of the first flange and the second flange are arranged between the tab and the cover plate body, so that the insulation effect between the tab and the cover plate body is good, and the safety of the battery is good.

Description

Technical Field

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

[0002] In lithium-ion batteries, the battery cover assembly is one of the key accessories. It is connected to the shell through the battery cover assembly to encapsulate the electrode group in the shell. At the same time, the pole on the battery cover assembly can lead out the pole ear of the electrode group to connect the external circuit.

[0003] At present, the existing battery cover assembly generally includes a riveting block, an upper plastic part, a pole, a cover body, a lower plastic part and a sealing ring. The sealing ring is sleeved outside the pole. The column part of the pole passes through the lower plastic part, the cover body, and the upper plastic part from one side of the cover body in sequence and is connected to the riveting block. The plate part of the pole is pressed against the lower plastic part. After the battery cover assembly is installed with the shell, the plate part of the pole and the lower plastic part are located in the shell and are sandwiched between the cover body and the pole group. Since the plate part and the lower plastic part of the pole have a certain height, they occupy the internal space of the shell, resulting in a reduction in the layout space of the pole group, which is not conducive to the rational use of space and the energy density of the battery is low. In addition, the pole and the battery cover are only insulated by a single layer through the lower plastic part, and the insulation effect is limited. When the current passing through the pole is large, the lower plastic part may be broken down, causing the cover body to be charged, with a short circuit risk. Summary of the invention

[0004] The object of the present invention is to provide a battery cover plate assembly and a battery, wherein the pole is arranged outside the cover plate body, without occupying the internal space of the shell, the space utilization rate is high, and it is beneficial to improve the energy density of the battery. In addition, the insulation effect between the pole ear and the cover plate body is good, and the battery safety is high.

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

[0006] In one aspect, the present invention provides a battery cover assembly, comprising:

[0007] The cover body is provided with a first mounting hole;

[0008] A first plastic part, arranged at one side of the cover body, the first plastic part comprising a plastic part body, the plastic part body being provided with a first through hole, a first flange being provided in a circumferential direction of the first through hole, and the first flange extending into the first mounting hole;

[0009] a second plastic part, arranged at the other side of the cover body, the second plastic part being provided with a second through hole, a second flange being provided around the second through hole, the second flange extending into the first mounting hole and connected with the first flange, and one of the first flange and the second flange being in contact with the inner wall of the first mounting hole;

[0010] The pole is arranged on a side of the first plastic part away from the cover body, and the pole lug of the pole group is connected to the pole after passing through the second through hole, the first mounting hole and the first through hole.

[0011] Optionally, the second flange is sleeved outside the first flange, and the peripheral side wall of the second flange is in contact with the inner wall of the first mounting hole;

[0012] Alternatively, the first flange is sleeved outside the second flange, and the peripheral side wall of the first flange is in contact with the inner wall of the first mounting hole.

[0013] Optionally, a first plugging groove is provided on the end surface of the first flange facing the second plastic part, the second flange extends into the first plugging groove, and the peripheral side wall of the first flange is in contact with the inner wall of the first mounting hole;

[0014] Alternatively, a second inserting groove is provided on the end surface of the second flange facing the first plastic part, the first flange extends into the second inserting groove, and the peripheral side wall of the second flange is in contact with the inner wall of the first mounting hole.

[0015] Optionally, a sink groove is provided on the end surface of the cover body facing away from the second plastic part, and a lap joint is provided in the circumference of the plastic part body, and the lap joint is embedded in the sink groove and fits with the bottom wall of the sink groove;

[0016] Among them, along the first direction, the thickness of the cover body is H, the distance between the end surface of the overlapping portion facing away from the second plastic part and the end surface of the cover body facing away from the second plastic part is b, and the value range of b satisfies: 0mm≤b≤0.5H.

[0017] Optionally, along the second direction, the width of the overlapping portion is c, and the value range of c satisfies: 0mm≤c≤10mm.

[0018] Optionally, two first plastic parts are provided, and the two first plastic parts are respectively arranged at two ends of the cover body along the third direction, and the plastic part body of each first plastic part is provided with two first through holes, and the first flanges are provided around the circumference of the first through holes.

[0019] Optionally, the second plastic part is provided with one, and the second plastic part is provided with four second through holes, the second through holes correspond to the first through holes one by one, and the second flange around each second through hole is connected to the first flange around the corresponding first through hole.

[0020] Optionally, a connecting rib and a third flange are provided on the side of the plastic body facing away from the cover body, the third flange is arranged in the circumference of the first through hole and opposite to the extension direction of the first flange, two third flanges are provided, and the third flanges correspond to the first flanges one by one, two connecting ribs are provided, and both ends of each connecting rib are respectively connected to the two third flanges, the connecting ribs, the third flange and the plastic body form a mounting groove, and at least part of the pole is embedded in the mounting groove.

[0021] Optionally, the first plastic part and the cover plate body are fixed by hot melting, as well as the second plastic part and the cover plate body.

[0022] On the other hand, the present invention provides a battery, comprising the battery cover assembly in any of the above schemes.

[0023] The beneficial effects of the present invention are:

[0024] The present invention provides a battery cover assembly, including a cover body, a first plastic part, a second plastic part and a pole, wherein the first plastic part and the second plastic part are respectively arranged on both sides of the cover body, and the pole is arranged on the side of the first plastic part away from the cover body. The cover body is provided with a first mounting hole, the first plastic part is provided with a first through hole, and a first flange is provided in the circumference of the first through hole. The second plastic part is provided with a second through hole, and a second flange is provided in the circumference of the second through hole, the second flange extends in a direction close to the first flange, the second flange and the first flange extend into the first mounting hole for connection, and one of the first flange and the second flange fits with the inner wall of the first mounting hole. The pole lug of the pole group passes through the second through hole, the first mounting hole and the first through hole and is connected to the pole.

[0025] After the battery cover assembly is assembled, the cover body is connected to the battery shell, the second plastic part is located inside the shell, and the pole is arranged outside the shell, so the pole does not occupy the space inside the shell. The pole ear of the pole group does not need to be bent inside the shell. The pole ear directly passes through the second plastic part, the cover body and the first plastic part and is connected to the pole, which greatly saves the internal space of the shell. The second plastic part is flat as a whole and its thickness is relatively thin, which can also save part of the internal space of the shell. The volume of the pole group is large, and the space utilization rate inside the shell is high, which helps to improve the energy density of the battery. In addition, there are two layers of insulation structure (first flange and second flange) between the pole ear and the cover body, and the insulation effect between the pole ear and the cover body is good, and the safety of the battery is good.

[0026] The present invention also provides a battery, including a shell, a pole group, and the above-mentioned battery cover assembly. The pole group is loaded into the shell through an opening on the shell, and the battery cover assembly is arranged at the opening of the shell and welded to the shell to encapsulate the pole group in the shell. By adopting the above-mentioned battery cover assembly, the pole is arranged outside the shell and does not occupy the internal space of the shell, and the second plastic part is flat and thin, so that the volume of the pole group can be increased, and the energy density of the battery is large. In addition, there is a two-layer insulation structure of a first flange and a second flange between the pole ear of the pole group and the cover body, and the insulation performance of the battery cover assembly is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without paying any creative work.

[0028] Figure 1 An exploded view of the battery cover assembly provided in Embodiment 1 of the present invention;

[0029] Figure 2 A top view of a battery cover assembly provided in Embodiment 1 of the present invention;

[0030] Figure 3 for Figure 2 Sectional view of the AA section;

[0031] Figure 4 for Figure 3 A partial enlarged view of point B in the middle;

[0032] Figure 5 An exploded view of the battery cover assembly provided in the first embodiment of the present invention from another perspective;

[0033] Figure 6 This is a schematic structural diagram of a first plastic part provided in Embodiment 1 of the present invention;

[0034] Figure 7 A cross-sectional view of a battery cover assembly provided in Embodiment 2 of the present invention;

[0035] Figure 8 for Figure 7 A partial enlarged view of point C in the middle;

[0036] Fig. 9 A cross-sectional view of a battery cover assembly provided in Embodiment 3 of the present invention;

[0037] Fig.10 for Fig. 9A partial enlarged view of point D in the middle;

[0038] Fig.11 A cross-sectional view of a battery cover assembly provided in Embodiment 4 of the present invention;

[0039] Fig.12 for Fig.11 A partial enlarged view of point E in the middle.

[0040] In the figure:

[0041] 100, cover body; 110, first mounting hole; 120, sink; 130, first fixing groove; 140, second fixing groove; 150, second mounting hole; 151, support rib; 160, first injection hole;

[0042] 200, first plastic part; 210, plastic part body; 211, first through hole; 220, first flange; 221, first plug-in slot; 230, overlap portion; 240, connecting rib; 241, mounting slot; 250, third flange; 260, first melting column;

[0043] 300, second plastic part; 310, second through hole; 320, second flange; 321, second plug-in slot; 330, second melting column; 340, vent hole; 350, second injection hole;

[0044] 400. Explosion-proof valve. DETAILED DESCRIPTION

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] Embodiment 1

[0050] like Figure 1-Figure 4As shown, this embodiment provides a battery cover assembly, which includes a cover body 100, a first plastic part 200, a second plastic part 300 and a pole, wherein the first plastic part 200 is arranged on one side of the cover body 100, the pole is arranged on the side of the first plastic part 200 away from the cover body 100, and the second plastic part 300 is arranged on the other side of the cover body 100. The cover body 100 is provided with a first mounting hole 110, the first plastic part 200 includes a plastic body 210, the plastic body 210 is provided with a first through hole 211, and a first flange 220 is provided in the circumference of the first through hole 211, and the first flange 220 extends into the first mounting hole 110 along the axial direction of the first mounting hole 110. The second plastic part 300 is provided with a second through hole 310, and a second flange 320 is provided around the circumference of the second through hole 310. The second flange 320 extends toward the first flange 220 along the axial direction of the first mounting hole 110, and the second flange 320 also extends into the first mounting hole 110 and is connected to the first flange 220. Along the radial direction of the first mounting hole 110, the first flange 220 and the second flange 320 are mutually sleeved and fit each other, and one of the first flange 220 and the second flange 320 fits the inner wall of the first mounting hole 110. It should be noted that Figure 1 The Z-axis direction shown in is the axial direction of the first mounting hole 110. Figure 1 The X-axis direction and the Y-axis direction shown in FIG. 1 are both radial directions of the first mounting hole 110 .

[0051] After the battery cover assembly is assembled, the pole lug of the pole group passes through the second through hole 310, the first mounting hole 110 and the first through hole 211 and is connected to the pole. The cover body 100 is connected to the shell of the battery, and the second plastic part 300 is located in the shell. Since the pole is arranged on the side of the first plastic part 200 away from the cover body 100, that is, the pole is arranged outside the shell, the pole will not occupy the space inside the shell, and the pole lug of the pole group does not need to be bent in the shell. The pole lug directly passes through the second plastic part 300, the cover body 100 and the first plastic part 200 and is connected to the pole, which greatly saves the internal space of the shell, increases the layout space of the pole group, and has a high space utilization rate inside the shell, which helps to improve the energy density of the battery. In addition, the second plastic part 300 in this embodiment is flat as a whole, and its thickness is relatively thin, which can also save part of the internal space of the shell and improve the space utilization rate.

[0052] As an optional technical solution, in this embodiment, the inner diameter of the first mounting hole 110 is greater than the outer diameter of the second flange 320, the inner diameter of the second flange 320 is equal to the outer diameter of the first flange 220, the second flange 320 is sleeved outside the first flange 220, and the peripheral side wall of the second flange 320 is in contact with the inner wall of the first mounting hole 110, the peripheral side wall of the first flange 220 is in contact with the inner wall of the second flange 320, and the tab is accommodated in the first through hole 211. Thus, a two-layer insulation structure (the first flange 220 and the second flange 320) is formed between the tab and the cover body 100, the insulation effect between the tab and the cover body 100 is good, and the safety of the battery is good.

[0053] Continue to see Figure 4 In this embodiment, a recessed groove 120 is provided on the end surface of the cover body 100 facing away from the second plastic part 300, and a lap joint 230 is provided in the circumferential direction of the plastic part body 210. The lap joint 230 is embedded in the recessed groove 120 and fits with the bottom wall of the recessed groove 120. On the one hand, the first plastic part 200 can be limited along the axial direction of the first mounting hole 110 by the provision of the lap joint 230, so as to ensure the accurate positioning between the first plastic part 200 and the cover body 100; on the other hand, the thickness of the battery cover assembly can be further reduced (along the longitudinal direction). Figure 1 The size in the Z-axis direction shown in the figure) can improve the space utilization of the whole battery pack and increase the energy density.

[0054] Among them, along the first direction (that is, Figure 1 ), the thickness of the cover body 100 is H, the distance between the end surface of the overlapping portion 230 away from the second plastic part 300 and the end surface of the cover body 100 away from the second plastic part 300 is b, and the value range of b satisfies: 0mm≤b≤0.5H. For example, the value range of H is 1mm-3mm. When H is 1mm, the value of b can be 0mm or 0.5mm. When H is 3mm, the value of b can be 0mm, 0.5mm, 1mm or 1.5mm. It should be noted that the value of b should not be too large. If the value of b is greater than 0.5H, the depth of the sink 120 is large, which affects the structural strength of the cover body 100. When the cover body 100 is bumped, it is easy to deform or rupture, resulting in battery failure. Of course, the value of b should not be too small. If the value of b is less than 0, it means that the end surface of the overlap portion 230 away from the second plastic part 300 exceeds the sink 120, which may affect the assembly between the first plastic part 200 and other structural parts.

[0055] Furthermore, along the second direction (i.e. Figure 1), the width of the overlap portion 230 is c, and the value range of c satisfies: 0mm≤c≤10mm. Exemplarily, the value of c can be 0mm, 1mm, 2mm, 5mm, 8mm or 10mm. By controlling the width c of the overlap portion 230 within the above range, it is possible to ensure that the assembly structure between the first plastic part 200 and the cover body 100 is stable, and the weight of the first plastic part 200 can be relatively reduced, thereby reducing material costs. It should be noted that when the width c of the overlap portion 230 is 0, the circumferential edge of the plastic body 210 of the first plastic part 200 overlaps the cover body 100, and at this time, the successful assembly of the first plastic part 200 and the cover body 100 can also be ensured. In addition, when the width c of the overlap portion 230 is greater than 10mm, it may occupy more space in the sink 120, affecting the assembly between the cover body 100 and other structural parts. Optionally, along the third direction (that is, Figure 1 The width of the overlap portion 230 is also c, and the value range of c satisfies: 0mm≤c≤10mm.

[0056] Continue to see Figure 1 , Figure 5 and Figure 6 In this embodiment, there are two electrode groups, and each electrode group has a positive electrode ear and a negative electrode ear at both ends in the length direction. The positive electrode ears of the two electrode groups are arranged on the same side, and the negative electrode ears of the two poles are arranged on the same side. There are two first plastic parts 200 and poles, and the two first plastic parts 200 are respectively arranged on the cover body 100 along the third direction ( Figure 1 At both ends of the two first plastic parts 200 (in the X-axis direction shown in the figure), the poles on the side of the two first plastic parts 200 facing away from the cover body 100 are respectively a positive pole and a negative pole, and the plastic body 210 of each first plastic part 200 is provided with two first through holes 211, and the first through hole 211 of each first plastic part 200 is provided with a first flange 220 in the circumference.

[0057] Furthermore, the second plastic part 300 is provided with a second plastic part 300 along the third direction ( Figure 1Two second through holes 310 are respectively provided at both ends of the housing (in the X-axis direction shown in ), that is, there are four second through holes 310 in total, and the second through holes 310 correspond to the first through holes 211 one by one, and each pole ear is correspondingly penetrated through a first through hole 211 and a second through hole 310. The second flange 320 in the circumference of each second through hole 310 is connected to the first flange 220 in the circumference of the corresponding first through hole 211. The positive pole ears of the two pole groups are connected to the positive pole column after passing through the second plastic part 300 and one of the first plastic parts 200, and the negative pole ears of the two pole groups are connected to the negative pole column after passing through the second plastic part 300 and the other first plastic part 200. In this way, the pole ears of the pole group are led out from the shell, and the pole ears are connected to the pole column on the outside of the shell, which will not occupy the internal space of the shell, and the space utilization rate is high, and the volume energy of the pole group is large.

[0058] Continue to see Figure 6 , a connecting rib 240 and a third flange 250 are provided on the side of the plastic body 210 away from the cover body 100. The third flange 250 is arranged in the circumference of the first through hole 211 and opposite to the extension direction of the first flange 220. There are two third flanges 250, and the third flanges 250 correspond to the first flanges 220 one by one. There are two connecting ribs 240, and the two ends of each connecting rib 240 are respectively connected to the two third flanges 250. The connecting ribs 240, the third flanges 250 and the plastic body 210 together form a mounting groove 241. The pole is flat as a whole, and at least part of the pole is embedded in the mounting groove 241. This further reduces the thickness of the battery cover assembly, so as to improve the space utilization and the energy density of the whole battery pack.

[0059] Optionally, the first plastic part 200 and the cover body 100 , as well as the second plastic part 300 and the cover body 100 , may be fixed by hot melting.

[0060] Continue to see Figure 1 and Figure 5, a first fixing groove 130 is provided on the bottom wall of the sink 120, and a first melting column 260 is provided on the end surface of the plastic body 210 facing the cover body 100. The first melting column 260 is inserted into the first fixing groove 130, and one end of the first melting column 260 inserted into the first fixing groove 130 is clamped in the first fixing groove 130 by ultrasonic hot melting, thereby realizing the connection between the first plastic part 200 and the cover body 100. Optionally, the first fixing groove 130 can be set as a trapezoidal groove or a stepped groove with a gradually narrowing entrance, so as to improve the connection strength between the first melting column 260 and the first fixing groove 130. In addition, the bottom wall of the sink 120 can be provided with a plurality of first fixing grooves 130, and correspondingly, a plurality of first melting columns 260 on the first plastic part 200 are also provided, and the first fixing grooves 130 and the first melting columns 260 correspond to each other one by one, thereby improving the connection strength between the first plastic part 200 and the cover body 100, and also improving the uniformity of the force on the first plastic part 200. For example, in this embodiment, two first melting columns 260 are provided on the end surface of the plastic body 210 facing the cover body 100, and two first fixing grooves 130 are correspondingly provided in the sink 120. Of course, in other embodiments, the number and arrangement of the first melting columns 260 and the first fixing grooves 130 can also be flexibly adjusted as needed, and this embodiment does not limit this.

[0061] Further, a second fixing groove 140 is provided on the end surface of the cover body 100 facing the second plastic part 300, and a second melting column 330 is provided on the end surface of the second plastic part 300 facing the cover body 100. The second melting column 330 is inserted into the second fixing groove 140, and one end of the second melting column 330 inserted into the second fixing groove 140 is clamped into the second fixing groove 140 by ultrasonic hot melting, thereby realizing the connection between the second plastic part 300 and the cover body 100. Optionally, the second fixing groove 140 can be set as a trapezoidal groove or a stepped groove with a gradually narrowing entrance, so as to improve the connection strength between the second melting column 330 and the second fixing groove 140. In addition, a plurality of second fixing grooves 140 may be provided on the end surface of the cover body 100 facing the second plastic part 300, and the plurality of second fixing grooves 140 are arranged at intervals near the edges of the cover body 100. Correspondingly, a plurality of second melting columns 330 are also provided on the second plastic part 300, and the plurality of second melting columns 330 are arranged at intervals near the edges of the second plastic part 300. The second fixing grooves 140 and the second melting columns 330 correspond to each other one by one, thereby improving the connection strength between the second plastic part 300 and the cover body 100, and also improving the uniformity of the force on the second plastic part 300. For example, in this embodiment, six second melting columns 330 are provided on the end surface of the second plastic part 300 facing the cover body 100, and six second fixing grooves 140 are correspondingly provided on the cover body 100. Of course, in other embodiments, the number and arrangement of the second melting columns 330 and the second fixing grooves 140 can also be flexibly adjusted as needed, and this embodiment does not limit this.

[0062] Optionally, the battery cover assembly in this embodiment further includes an explosion-proof valve 400. The cover body 100 is provided with a second mounting hole 150, and the explosion-proof valve 400 is arranged in the second mounting hole 150; a vent hole 340 is provided on the second plastic part 300 at a position corresponding to the second mounting hole 150, and a vent hole 340 is provided along the first direction ( Figure 1 The projection of the vent hole 340 on the cover body 100 (Z-axis direction shown in the figure) coincides with the projection of the explosion-proof valve 400 on the cover body 100. Therefore, when the pressure in the battery shell exceeds the valve opening pressure of the explosion-proof valve 400, high-temperature, high-pressure gas and liquid can be discharged out of the battery through the vent hole 340 and the explosion-proof valve 400, avoiding the risk of explosion and having high safety. In addition, criss-crossing support ribs 151 are also provided in the second mounting hole 150, and the support ribs 151 can support the explosion-proof valve 400 and improve the installation strength of the explosion-proof valve 400. Furthermore, a plurality of vent holes 340 on the second plastic part 300 can be arranged at intervals to increase the flow area, so that high-temperature, high-pressure gas and liquid can be discharged quickly and circulate smoothly.

[0063] Optionally, in some embodiments, a first injection hole 160 is further provided on the cover body 100, and a second injection hole 350 is provided on the second plastic part 300 at a position corresponding to the first injection hole 160, and the projection of the first injection hole 160 on the cover body 100 along the first direction coincides with the projection of the second injection hole 350 on the cover body 100. After the battery cover assembly is assembled with the shell, electrolyte can be injected into the shell through the first injection hole 160 and the second injection hole 350 so that the electrode group can be immersed in the electrolyte. After the injection is completed, an injection plug can be installed in the first injection hole 160 and / or the second injection hole 350 to seal the first injection hole 160 and / or the second injection hole 350 to prevent leakage of the electrolyte. Exemplarily, the injection plug is made of a material with elastic deformation ability such as rubber.

[0064] This embodiment also provides a battery, including a shell, a pole group, and the above-mentioned battery cover assembly. An opening is provided on one side of the shell, and the pole group is loaded into the shell through the opening. The battery cover assembly is arranged at the opening of the shell and is welded to the shell. The battery cover assembly and the shell form a closed accommodation space to enclose the pole group in the accommodation space. By adopting the above-mentioned battery cover assembly, the pole column is arranged outside the shell and does not occupy the internal space of the shell, and the second plastic part 300 is flat and thin, so that the volume of the pole group can be increased, and the energy density of the battery is large. In addition, there are two layers of insulation structure, namely, the first flange 220 and the second flange 320, between the pole ear of the pole group and the cover body 100, and the insulation performance of the battery cover assembly is better.

[0065] Embodiment 2

[0066] This embodiment provides a battery cover assembly, which is different from the battery cover assembly in the first embodiment in that the assembly structure between the first flange 220 and the second flange 320 in the battery cover assembly is different.

[0067] Specifically, see Figure 7 and Figure 8 In this embodiment, the inner diameter of the first mounting hole 110 is larger than the outer diameter of the first flange 220, the inner diameter of the first flange 220 is equal to the outer diameter of the second flange 320, the first flange 220 is sleeved outside the second flange 320, and the peripheral side wall of the first flange 220 is in contact with the inner wall of the first mounting hole 110, the peripheral side wall of the second flange 320 is in contact with the inner wall of the first flange 220, and the tab is accommodated in the second through hole 310. Thus, there are two layers of insulation structure (first flange 220 and second flange 320) between the tab and the cover body 100, the insulation effect between the tab and the cover body 100 is good, and the safety of the battery is good.

[0068] This embodiment also provides a battery, including a shell, a pole group, and the above-mentioned battery cover assembly. The battery cover assembly is arranged at the opening of the shell and is welded to the shell. The battery cover assembly and the shell form a closed accommodation space to enclose the pole group in the accommodation space. By adopting the above-mentioned battery cover assembly, the pole is arranged outside the shell and does not occupy the internal space of the shell, and the second plastic part 300 is flat and thin, so that the volume of the pole group can be increased, and the energy density of the battery is large. And there are two layers of insulation structure, the first flange 220 and the second flange 320, between the pole ear of the pole group and the cover body 100, and the insulation performance of the battery cover assembly is better.

[0069] The remaining structures in this embodiment are the same as those in the first embodiment and will not be described in detail here.

[0070] Embodiment 3

[0071] This embodiment provides a battery cover assembly, which is different from the battery cover assembly in the first embodiment in that the assembly structure between the first flange 220 and the second flange 320 in the battery cover assembly is different.

[0072] Specifically, see Fig. 9 and Fig.10 In this embodiment, the inner diameter of the first mounting hole 110 is larger than the outer diameter of the first flange 220, the outer diameter of the first flange 220 is larger than the outer diameter of the second flange 320, and the inner diameter of the first flange 220 is smaller than the inner diameter of the second flange 320. A first insertion groove 221 is provided on the end surface of the first flange 220 facing the second plastic part 300, and the second flange 320 extends into the first insertion groove 221. Along the radial direction of the first mounting hole 110 ( Fig. 9 The two sides of the second flange 320 are respectively fitted to the side walls of the first plug-in slot 221, the peripheral side walls of the first flange 220 are fitted to the inner wall of the first mounting hole 110, and the tab is accommodated in the first through hole 211. Thus, there are two layers of insulation structure (first flange 220 and second flange 320) between the tab and the cover body 100, the insulation effect between the tab and the cover body 100 is good, and the safety of the battery is good. In addition, due to the setting of the first plug-in slot 221, the positioning between the first plastic part 200 and the second plastic part 300 can be made more accurate, which is conducive to improving the assembly accuracy of the battery cover assembly.

[0073] This embodiment also provides a battery, including a shell, a pole group, and the above-mentioned battery cover assembly. The battery cover assembly is arranged at the opening of the shell and is welded to the shell. The battery cover assembly and the shell form a closed accommodation space to enclose the pole group in the accommodation space. By adopting the above-mentioned battery cover assembly, the pole is arranged outside the shell and does not occupy the internal space of the shell, and the second plastic part 300 is flat and thin, so that the volume of the pole group can be increased, and the energy density of the battery is large. And there are two layers of insulation structure, the first flange 220 and the second flange 320, between the pole ear of the pole group and the cover body 100, and the insulation performance of the battery cover assembly is better.

[0074] The remaining structures in this embodiment are the same as those in the first embodiment and will not be described in detail here.

[0075] Embodiment 4

[0076] This embodiment provides a battery cover assembly, which is different from the battery cover assembly in the first embodiment in that the assembly structure between the first flange 220 and the second flange 320 in the battery cover assembly is different.

[0077] Specifically, see Fig.11 and Fig.12 In this embodiment, the inner diameter of the first mounting hole 110 is larger than the outer diameter of the second flange 320, the outer diameter of the second flange 320 is larger than the outer diameter of the first flange 220, and the inner diameter of the second flange 320 is smaller than the inner diameter of the first flange 220. A second insertion groove 321 is provided on the end surface of the second flange 320 facing the first plastic part 200, and the first flange 220 extends into the second insertion groove 321. Along the radial direction of the first mounting hole 110 ( Fig.11 The two sides of the first flange 220 are respectively fitted to the side walls of the second plug-in slot 321, the peripheral side walls of the second flange 320 are fitted to the inner wall of the first mounting hole 110, and the tab is accommodated in the second through hole 310. As a result, there are two layers of insulation structure (first flange 220 and second flange 320) between the tab and the cover body 100, the insulation effect between the tab and the cover body 100 is good, and the safety of the battery is good. In addition, due to the provision of the second plug-in slot 321, the positioning between the first plastic part 200 and the second plastic part 300 can be made more accurate, which is conducive to improving the assembly accuracy of the battery cover assembly.

[0078] This embodiment also provides a battery, including a shell, a pole group, and the above-mentioned battery cover assembly. The battery cover assembly is arranged at the opening of the shell and is welded to the shell. The battery cover assembly and the shell form a closed accommodation space to enclose the pole group in the accommodation space. By adopting the above-mentioned battery cover assembly, the pole is arranged outside the shell and does not occupy the internal space of the shell, and the second plastic part 300 is flat and thin, so that the volume of the pole group can be increased, and the energy density of the battery is large. And there are two layers of insulation structure, the first flange 220 and the second flange 320, between the pole ear of the pole group and the cover body 100, and the insulation performance of the battery cover assembly is better.

[0079] The remaining structures in this embodiment are the same as those in the first embodiment and will not be described in detail here.

[0080] 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 cover assembly, characterized in that: include: The cover body is provided with a first mounting hole; A first plastic part, arranged at one side of the cover body, the first plastic part comprising a plastic part body, the plastic part body being provided with a first through hole, a first flange being provided in a circumferential direction of the first through hole, and the first flange extending into the first mounting hole; a second plastic part, arranged at the other side of the cover body, the second plastic part being provided with a second through hole, a second flange being provided around the second through hole, the second flange extending into the first mounting hole and connected with the first flange, and one of the first flange and the second flange being in contact with the inner wall of the first mounting hole; The pole is arranged on a side of the first plastic part away from the cover body, and the pole lug of the pole group is connected to the pole after passing through the second through hole, the first mounting hole and the first through hole.

2. The battery cover assembly according to claim 1, characterized in that: The second flange is sleeved outside the first flange, and the peripheral side wall of the second flange is in contact with the inner wall of the first mounting hole; Alternatively, the first flange is sleeved outside the second flange, and the peripheral side wall of the first flange is in contact with the inner wall of the first mounting hole.

3. The battery cover assembly according to claim 1, characterized in that: A first plugging groove is provided on the end surface of the first flange facing the second plastic part, the second flange extends into the first plugging groove, and the peripheral side wall of the first flange is in contact with the inner wall of the first mounting hole; Alternatively, a second inserting groove is provided on the end surface of the second flange facing the first plastic part, the first flange extends into the second inserting groove, and the peripheral side wall of the second flange is in contact with the inner wall of the first mounting hole.

4. The battery cover assembly according to claim 1, characterized in that: A sink groove is provided on the end surface of the cover plate body on the side away from the second plastic part, and a lap joint is provided in the circumference of the plastic part body, and the lap joint is embedded in the sink groove and fits with the bottom wall of the sink groove; Among them, along the first direction, the thickness of the cover body is H, the distance between the end surface of the overlapping portion facing away from the second plastic part and the end surface of the cover body facing away from the second plastic part is b, and the value range of b satisfies: 0mm≤b≤0.5H.

5. The battery cover assembly according to claim 4, characterized in that: Along the second direction, the width of the overlapping portion is c, and the value range of c satisfies: 0mm≤c≤10mm.

6. The battery cover assembly according to claim 1, characterized in that: There are two first plastic parts, which are respectively arranged at two ends of the cover body along the third direction. Two first through holes are arranged on the plastic body of each first plastic part, and the first flanges are arranged around the circumference of the first through holes.

7. The battery cover assembly according to claim 6, characterized in that: The second plastic part is provided with one, and the second plastic part is provided with four second through holes, the second through holes correspond to the first through holes one by one, and the second flange around each second through hole is connected to the first flange around the corresponding first through hole.

8. The battery cover assembly according to claim 6, characterized in that: A connecting rib and a third flange are provided on the side of the plastic body away from the cover body. The third flange is arranged in the circumferential direction of the first through hole and opposite to the extension direction of the first flange. Two third flanges are provided, and the third flanges correspond to the first flanges one by one. Two connecting ribs are provided, and both ends of each connecting rib are respectively connected to the two third flanges. The connecting ribs, the third flange and the plastic body form a mounting groove, and at least part of the pole is embedded in the mounting groove.

9. The battery cover assembly according to claim 1, characterized in that: The first plastic part and the cover plate body are fixed by heat melting, as are the second plastic part and the cover plate body.

10. A battery, characterized in that: A battery cover assembly comprising any one of claims 1-9.

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