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, the battery cover plate assembly comprises a cover plate body, a first plastic part, a second plastic part and a pole, the first plastic part and the second plastic part are respectively arranged on two sides of the cover plate body, and the pole is arranged on one side, deviating from the cover plate body, of the first plastic part. Tabs of the pole group penetrate through the second plastic part, the cover plate body and the first plastic part and then are connected with the pole columns. The pole is arranged on one side, deviating from the cover plate body, of the first plastic part, the internal space of the shell is not occupied, the volume of the pole group is increased, the utilization rate of the internal space of the shell is high, and the energy density of the battery is high. Furthermore, the tab shaping structure on the second plastic part can gather the tab, the overall shape of the tab is good, the tab and the shell are not prone to short-circuit lap joint, and the safety of the battery is high. The invention also provides a battery which comprises the battery cover plate assembly.

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 body of the pole is pressed against the lower plastic part. After the battery cover assembly is installed with the shell, the plate body 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 body 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, when the existing pole ear is connected to the plate body of the pole after being led out from the pole group, the pole ear needs to be bent in a C-shaped or S-shaped manner. Due to the lack of support, the shape of the pole ear in the shell may be deformed, and there is a risk of short circuit between the pole ear and the shell. 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 shell, does not need to occupy the internal space of the shell, the volume of the pole group is increased, the space utilization rate is high, and the energy density of the battery is high. In addition, the shape of the pole ear is good, and it is not easy to overlap and short-circuit with the shell, and the battery is highly safe.

[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 plate body is provided with a first mounting hole;

[0008] A first plastic part, arranged on one side of the cover body, the first plastic part comprising a first plastic part body, and a first through hole is provided on the first plastic part body;

[0009] A second plastic part is arranged on the other side of the cover body, the second plastic part comprises a second plastic part body, a second through hole and a tab shaping structure are arranged on the second plastic part body, the tab shaping structure is arranged in the circumference of the second through hole, and the tab shaping structure is located on a side of the second plastic part body away from the cover body;

[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 passes through the second through hole, the first mounting hole and the first through hole and is connected to the pole.

[0011] Optionally, the pole ear shaping structure includes two guide plates, the two guide plates are respectively arranged on both sides of the second through hole along the first direction, and the two guide plates are inclined in the direction away from the axis of the second through hole, and along the direction away from the second through hole, an open gradually widened bell mouth is formed between the two guide plates, the large end of the bell mouth faces the pole group, the small end of the bell mouth is connected to the second plastic body, and the pole ear is inserted into the bell mouth;

[0012] The included angle between the guide plate and the axis of the second through hole is α, and the value range of α is 45°≤α≤87°.

[0013] Optionally, along the first direction, a plurality of the first through holes are spaced apart on the first plastic body, a plurality of the second through holes and the tab shaping structure are both provided on the second plastic body, and the first through holes, the second through holes and the tab shaping structure correspond one to one.

[0014] Optionally, a support structure is provided on one side of the second plastic body close to the cover body, the support structure includes a connecting plate and a support plate, the connecting plate is connected to the pole ear shaping structure, the support plate is arranged on the end surface of the connecting plate close to the cover body, and the support plate abuts against the cover body.

[0015] Optionally, along the first direction, the distance between the support plate and the tab shaping structure is e, and the value range of e is 0.5 mm ≤ e ≤ 20 mm;

[0016] And / or, along the second direction, a distance between an end surface of the connecting plate facing away from the cover plate body and an end surface of the second plastic component body facing away from the cover plate body is f, and a value range of f is 0 mm ≤ f ≤ 2 mm.

[0017] Optionally, a first flange is provided around the first through hole, and the first flange extends into the first mounting hole; a second flange is provided around the second through hole, and the second flange extends into the first mounting hole and is connected to the first flange; one of the first flange and the second flange is in contact with the inner wall of the first mounting hole.

[0018] 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;

[0019] Or, 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;

[0020] Or, 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;

[0021] 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.

[0022] 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 first plastic part body, and the lap joint is embedded in the sink groove and fits with the bottom wall of the sink groove;

[0023] Wherein, along the second direction, the thickness of the cover body is H, the distance between the end surface of the overlap portion away from the second plastic part and the end surface of the cover body away from the second plastic part is b, and the value range of b satisfies: 0mm≤b≤0.5H;

[0024] And / or, along the first direction, the width of the overlapping portion is c, and the value range of c satisfies: 0mm≤c≤10mm.

[0025] 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.

[0026] On the other hand, the present invention provides a battery, comprising a shell, a pole group, and a battery cover assembly in any of the above schemes, wherein the battery cover assembly is encapsulated at the opening of the shell, and the pole group is arranged in the shell.

[0027] The beneficial effects of the present invention are:

[0028] The present invention provides a battery cover assembly, comprising 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. After the battery cover assembly is assembled, the pole lug of the pole group passes through the second plastic part, the cover body and the first plastic part and is connected to the pole. Since the pole is arranged on the side of the first plastic part away from the cover body, the pole will not occupy the space inside the shell, which greatly saves the internal space of the shell, increases the volume of the pole group, and has a high space utilization rate inside the shell, which helps to improve the energy density of the battery. Furthermore, a pole lug shaping structure is provided on the second plastic part, and the pole lug can be folded by the pole lug shaping structure, and the overall shape of the pole lug is good. In addition, the pole lug can also be supported by the pole lug shaping structure to avoid short-circuit overlap between the pole lug and the shell, thereby ensuring the safety of the battery.

[0029] The present invention also provides a battery, comprising the battery cover assembly. By adopting the battery cover assembly, the pole does not occupy the internal space of the shell, the volume of the pole group is increased, and the energy density of the battery is high. In addition, the pole ear shaping structure on the second plastic part can gather the pole ear, the overall shape of the pole ear is good, the pole ear and the shell are not prone to short circuit overlap, and the battery has good safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] 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.

[0031] Figure 1 An exploded view of the battery cover assembly provided in Embodiment 1 of the present invention;

[0032] Figure 2 A top view of a battery cover assembly provided in Embodiment 1 of the present invention;

[0033] Figure 3 for Figure 2 Sectional view of the AA section;

[0034] Figure 4 for Figure 3 A partial enlarged view of point B in the middle;

[0035] Figure 5 An exploded view of the battery cover assembly provided in the first embodiment of the present invention from another perspective;

[0036] Figure 6 This is a schematic structural diagram of a first plastic part provided in Embodiment 1 of the present invention;

[0037] Figure 7 A cross-sectional view of a battery cover assembly provided in Embodiment 2 of the present invention;

[0038] Figure 8 for Figure 7 A partial enlarged view of point C in the middle;

[0039] Fig. 9 A cross-sectional view of a battery cover assembly provided in Embodiment 3 of the present invention;

[0040] Fig.10 for Fig. 9 A partial enlarged view of point D in the middle;

[0041] Fig.11 A cross-sectional view of a battery cover assembly provided in Embodiment 4 of the present invention;

[0042] Fig.12 for Fig.11 A partial enlarged view of point E in the middle.

[0043] In the figure:

[0044] 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;

[0045] 200, first plastic part; 210, first 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;

[0046] 300, second plastic part; 310, second plastic part body; 311, second through hole; 312, pole ear shaping structure; 3121, guide plate; 3122, bell mouth; 313, support structure; 3131, connecting plate; 3132, support plate; 320, second flange; 321, second plug-in slot; 330, second melting column; 340, vent hole;

[0047] 400. Explosion-proof valve. DETAILED DESCRIPTION

[0048] 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.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] Embodiment 1

[0053] like Figure 1-Figure 4 As 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 opposite to the first plastic part 200. The cover body 100 is provided with a first mounting hole 110, the first plastic part 200 includes a first plastic part body 210, the first plastic part body 210 is provided with a first through hole 211, and the second plastic part 300 includes a second plastic part body 310, and the second plastic part body 310 is provided with a second through hole 311.

[0054] After the battery cover assembly is assembled, the pole ear of the pole group passes through the second through hole 311, the first mounting hole 110, and the first through hole 211 and is connected to the pole, and the pole group is connected to the external circuit through the pole. The cover body 100 is connected to the shell of the battery. Compared with the previous solution of setting the pole inside the shell, the second plastic part 300 in this embodiment is located inside the shell, and the pole is set outside the shell, so the pole does not occupy the space inside the shell. The pole ear 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 volume of the pole group, and has a high space utilization rate inside the shell, which helps to improve the energy density of the battery.

[0055] Furthermore, in this embodiment, a tab shaping structure 312 is provided on the second plastic body 310, and the tab shaping structure 312 is arranged in the circumference of the second through hole 311, and the tab shaping structure 312 is located on the side of the second plastic body 310 away from the cover body 100, that is, the tab shaping structure 312 is arranged on the side close to the pole group. The tab shaping structure 312 can be used to gather the tab into the second through hole 311, and it can play a good guiding role when the tab passes through the second through hole 311, and the overall shape of the tab is good. In addition, the tab shaping structure 312 can also support the tab, avoid short-circuit overlap between the tab and the shell, and ensure the safety of the battery.

[0056] As an optional solution, the tab shaping structure 312 in this embodiment includes two guide plates 3121, and the two guide plates 3121 are respectively arranged in the second through hole 311 along the first direction ( Figure 1-Figure 3 3121 are arranged on both sides of the second through hole 311 (in the Y-axis direction shown in the figure), and the two guide plates 3121 are inclined in the direction away from the axis of the second through hole 311. Along the direction away from the second through hole 311, a gradually widened bell mouth 3122 is formed between the two guide plates 3121, the large end of the bell mouth 3122 faces the pole group, and the small end of the bell mouth 3122 is connected to the second plastic body 310 in the circumference of the second through hole 311. During installation, the pole ear is inserted into the second through hole 311 from the large end of the bell mouth 3122. Along the direction close to the second through hole 311, the opening of the bell mouth 3122 gradually shrinks, so when the pole ear is inserted into the bell mouth 3122, the guide plates 3121 on both sides of the bell mouth 3122 can well gather the pole ear into the second through hole 311, and the pole ear does not need to be bent in a C-shape or an S-shape in the shell, and the overall shape is good.

[0057] Among them, the angle between the guide plate 3121 and the axis of the second through hole 311 is α, and the value range of α is 45°≤α≤87°. Exemplarily, the value of α can be 45°, 50°, 60°, 70°, 80°, 87°, and so on. By controlling the value of α within the above range, it can be ensured that the pole ear shaping structure 312 can well gather the pole ear in the second through hole 311. It should be noted that when the value of α is too large, it will not have a good shaping effect on the pole ear; when the value of α is too small, the pole ear is easily inserted into the pole group and causes a short circuit, and the height of the second plastic part 300 along the second direction (the second direction is the height of the second plastic part 300) will be increased. Figure 1 , Figure 3 The Z-axis direction shown in FIG), is not conducive to improving the energy density of the battery.

[0058] Furthermore, in this embodiment, two pole groups are provided in the housing as an example. A positive pole ear and a negative pole ear are provided at both ends of the length direction of each pole group, and the positive pole ears of the two pole groups are provided on the same side, and the negative pole ears of the two poles are provided on the same side. The first plastic part 200 and the pole are provided with two, and the two first plastic parts 200 are respectively provided on the cover body 100 along the third direction ( Figure 1 , Figure 2 The two ends of the first plastic parts 200 are respectively a positive pole and a negative pole on the side away from the cover body 100, and the first plastic part body 210 of each first plastic part 200 is provided with two first through holes 211, and the two first through holes are arranged along the first direction ( Figure 1 , Figure 2 The two first through holes 211 on the first plastic part 200 are respectively used for the positive tabs of the two electrode groups to pass through, or the two first through holes 211 on the first plastic part 200 are respectively used for the negative tabs of the two electrode groups to pass through.

[0059] The second plastic part 300 is provided with a second through hole 311 at both ends of the second plastic part body 310 along the third direction, that is, there are four second through holes 311 in total, and each second through hole 311 is provided with a pole ear shaping structure 312 in the circumferential direction, and the first through hole 211, the second through hole 311 and the pole ear shaping structure 312 correspond to each other. The positive pole ear of each pole group passes through a pole ear shaping structure 312, the second through hole 311, the first mounting hole 110 and the first through hole 211 and is connected to the positive pole column, and the negative pole ear of each pole group passes through the pole ear shaping structure 312, the second through hole 311, the first mounting hole 110 and the first through hole 211 at the other end of the second plastic part 300 and is connected to the negative pole column. In this way, the pole ear of the pole group is led out from the shell and connected to the pole column on the outside of the shell, which does not occupy the internal space of the shell, the volume of the pole group is increased, the space utilization rate is high, and the energy density of the battery is high. It should be noted that each pole lug is provided with a corresponding pole lug shaping structure 312 to ensure that each pole lug has a good shape and is not prone to overlap and short circuit with the shell.

[0060] Optionally, in this embodiment, a support structure 313 is further provided on one side of the second plastic body 310 close to the cover body 100, and a plurality of support structures 313 are provided, wherein two support structures 313 are respectively provided at the two ends of the second plastic body 300 along the first direction, and connected to the pole ear shaping structure 312 on one side thereof, and the remaining support structures 313 are arranged between two adjacent pole ear shaping structures 312 along the first direction, and one or more support structures 313 may be provided between every two pole ear shaping structures 312, and here, one support structure 313 is provided between every two pole ear shaping structures 312 as an example for explanation. That is, support structures 313 are provided on both sides of each pole ear shaping structure 312 along the first direction for support. The pole ear shaping structure 312 can be well supported by the above-mentioned multiple support structures 313, so as to ensure that the mechanical strength of the pole ear shaping structure 312 is high and not easy to deform.

[0061] In some embodiments, the support structure 313 includes a connecting plate 3131 and a supporting plate 3132, one end of the connecting plate 3131 located near the end of the second plastic body 310 along the first direction is connected to the tab shaping structure 312, the other end of the connecting plate 3131 located near the end of the second plastic body 310 along the first direction is connected to the supporting plate 3132, and the supporting plate 3132 is connected to the edge of the connecting plate 3131 near the second plastic body 310 along the first direction. Further, the supporting plate 3132 is arranged on the end surface of the connecting plate 3131 near the cover body 100, and the supporting plate 3132 abuts against the cover body 100, thereby supporting the tab shaping structure 312 connected thereto. In the support structure 313 located between two adjacent pole ear shaping structures 312, the two ends of its connecting plate 3131 are respectively connected to the end of the guide plate 3121 of a pole ear shaping structure 312 close to the pole group, and the support plate 3132 is connected to the middle part of the connecting plate 3131. The support plate 3132 is arranged on the end surface of the connecting plate 3131 close to the cover plate body 100, and the support plate 3132 is abutted against the cover plate body 100, thereby supporting the two adjacent pole ear shaping structures 312.

[0062] Continue to see Figure 4 , along the first direction, the distance between the support plate 3132 and the pole ear shaping structure 312 is e, and the value range of e is 0.5mm≤e≤20mm. Exemplarily, the value of e can be 0.5mm, 1.0mm, 5mm, 10mm, 15mm or 20mm, which can be adjusted according to the size of the second plastic part 300 along the first direction, and will not be listed here one by one. It should be noted that the value of e should not be too small, otherwise the connecting plate 3131 is relatively sharp and it is easy to pierce the pole ear or pole group. Of course, the value of e should not be too large, otherwise it occupies the space of the pole ear shaping structure 312 along the first direction, and the height of the pole ear shaping structure 312 along the second direction increases, which is easy to crush the pole group.

[0063] Further, along the second direction, the distance between the end face of the connecting plate 3131 away from the cover body 100 and the end face of the second plastic body 310 away from the cover body 100 is f, and the value range of f is 0mm≤f≤2mm. Exemplarily, the value of f can be 0mm, 0.5mm, 1.0mm, 1.5mm or 2.0mm. It should be noted that the value of f cannot be less than 0mm, otherwise the pole ear shaping structure 312 will protrude from the end face of the second plastic body 310 close to the pole group, which is easy to crush the pole group. The value of f should not be too large, otherwise the inclination angle of the guide plate 3121 is too large, the structure of the pole ear is relatively loose, the pole ear shaping structure 312 has a poor shaping effect on the pole ear, the pole ear shape is not good, and short circuit is easy to occur.

[0064] See also Figure 1 , Figure 4 and Figure 5 In this embodiment, a double insulation structure is also provided between the tab and the cover body 100. Specifically, 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 second direction. A second flange 320 is provided in the circumference of the second through hole 311, and the second flange 320 also extends into the first mounting hole 110 in the direction close to the first flange 220 and is connected to the first flange 220. The second flange 320 is sleeved outside the first flange 220 and fits against the inner wall of the first mounting hole 110. The tab is accommodated in the first through hole 211 on the inner side of the first flange 220, and there are two layers of insulation structure (first flange 220 and second flange 320) between the tab and the cover body 100, which has a good insulation effect and high battery safety.

[0065] Furthermore, in this embodiment, a recessed groove 120 is provided on the end surface of the cover body 100 on the side away from the second plastic part 300, and a lap joint 230 is provided in the circumferential direction of the first plastic part body 210. The lap joint 230 is annular and surrounds the first 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 arrangement of the lap joint 230 can be used to extend the first mounting hole 110 in the axial direction (the second direction, i.e., Figure 1 On the other hand, by setting the sink 120, the height of the battery cover assembly along the second direction can be further reduced, thereby improving the space utilization of the entire battery pack and increasing the energy density.

[0066] Among them, along the second 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 mm, 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.

[0067] Optionally, along the first direction (ie 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 0mm, the circumferential edge of the first plastic part body 210 is directly overlapped on 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.

[0068] Optionally, along the third direction (i.e. Figure 1 The width of the overlap portion 230 is also c, and the value range of c satisfies: 0mm≤c≤10mm. The width of the overlap portion 230 along the first direction and the width of the overlap portion 230 along the third direction can be equal or unequal, as long as the value of the width c of the overlap portion 230 is within the above range.

[0069] Further, see Figure 6 , a connecting rib 240 and a third flange 250 are provided on the side of the first 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. The third flange 250 corresponds to the first flange 220 one by one, and the third flange 250 and the first flange 220 are both annular. There are two connecting ribs 240, and the two ends of each connecting rib 240 are respectively connected to a third flange 250. The connecting ribs 240, the third flange 250 and the first plastic body 210 jointly 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. Thereby, the height of the battery cover assembly along the second direction is further reduced, so as to improve the space utilization and the energy density of the whole battery pack. Optionally, the second flange 320 on the second plastic body 310 is also annular.

[0070] In some embodiments, 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.

[0071] 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 first 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 after ultrasonic heat 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 first 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.

[0072] 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 body 310 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 after ultrasonic heat 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 body 310, and the plurality of second melting columns 330 are arranged at intervals near the edges of the second plastic part body 310. 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 body 310 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.

[0073] 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; the second plastic body 310 is provided with a vent hole 340 at a position corresponding to the second mounting hole 150, and the explosion-proof valve 400 is arranged in the second 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 from 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 body 310 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.

[0074] Optionally, in some embodiments, a first injection hole 160 is further provided on the cover body 100, and a second injection hole (not shown in the figure) is provided on the second plastic body 310 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 second direction coincides with the projection of the second injection hole 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 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 to seal the first injection hole 160 and / or the second injection hole to prevent leakage of the electrolyte. Exemplarily, the injection plug is made of a material with elastic deformation ability such as rubber.

[0075] 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 will not occupy the internal space of the shell. The volume of the pole group is increased, and the energy density of the battery is large. And the pole ear shaping structure 312 on the second plastic body 310 can be used to gather the pole ear into the second through hole 311, and it plays a good guide when the pole ear passes through the second through hole 311. The overall shape of the pole ear is good, and it is not easy to short-circuit between the pole ear and the shell, and the safety of the battery is good. In addition, there are two layers of insulation structure of 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.

[0076] Table 1 below provides several specific implementation examples for illustration. In each implementation example, the angle α between the guide plate 3121 of the second plastic part 200 and the axis of the second through hole 311 has different values, and the other parameters are the same.

[0077] Table 1

[0078]

[0079] From the above results, it can be seen that the value of the angle α in Implementation Case 1 is less than the minimum value of 45°≤α≤87°, the inclination angle of the guide plate 3121 is small, and CT shows that the gathering and shaping effect of the pole ear is poor. The pole ear is inserted upside down into the pole group, causing a short circuit in the pole group, and the battery product is unqualified.

[0080] In Implementation Case 11, the value of the angle α is greater than the maximum value of 45°≤α≤87°. The inclination angle of the guide plate 3121 is relatively large, and it cannot play a good role in gathering and shaping the pole ear. CT shows that the shape of the pole ear inside the battery is poor, and the battery product is unqualified.

[0081] The value of the angle α in Implementation Case 2, Implementation Case 3, Implementation Case 4, Implementation Case 5, Implementation Case 6, Implementation Case 7, Implementation Case 8, Implementation Case 9, and Implementation Case 10 is within the range of 45°≤α≤87°, the inclination angle of the guide plate 3121 is appropriate, and can play a good role in gathering and shaping the pole ear. CT shows that the shape of the pole ear inside the battery is good, the pole ear is not inserted into the pole group, the pole group short-circuit test is passed, and the battery product is qualified.

[0082] Embodiment 2

[0083] 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.

[0084] Specifically, see Figure 7 and Figure 8 In this embodiment, the inner diameter of the first mounting hole 110 is equal to 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 first through hole 211 and the second through hole 311. Thus, there are two layers of insulation structure (the first flange 220 and the second flange 320, and the first flange 220 and the second flange 320 are both annular) 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.

[0085] 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 will not occupy the internal space of the shell. The volume of the pole group is increased, and the energy density of the battery is large. And the pole ear shaping structure 312 on the second plastic body 310 can be used to gather the pole ear into the second through hole 311, and it plays a good guide when the pole ear passes through the second through hole 311. The overall shape of the pole ear is good, and it is not easy to short-circuit between the pole ear and the shell, and the safety of the battery is good. In addition, there are two layers of insulation structure of 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.

[0086] The remaining structures in this embodiment are the same as those in the first embodiment and will not be described in detail here.

[0087] Embodiment 3

[0088] 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.

[0089] Specifically, see Fig. 9 and Fig.10 In this embodiment, the inner diameter of the first mounting hole 110 is equal to the outer diameter of the first flange 220, the outer diameter of the first flange 220 is greater 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. 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.

[0090] 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 will not occupy the internal space of the shell. The volume of the pole group is increased, and the energy density of the battery is large. And the pole ear shaping structure 312 on the second plastic body 310 can be used to gather the pole ear into the second through hole 311, and it plays a good guide when the pole ear passes through the second through hole 311. The overall shape of the pole ear is good, and it is not easy to short-circuit between the pole ear and the shell, and the safety of the battery is good. In addition, there are two layers of insulation structure of 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.

[0091] The remaining structures in this embodiment are the same as those in the first embodiment and will not be described in detail here.

[0092] Embodiment 4

[0093] 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.

[0094] Specifically, see Fig.11 and Fig.12 In this embodiment, the inner diameter of the first mounting hole 110 is equal to 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. 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 tabs are accommodated in the first through hole 211 and the second through hole 311. As a result, there are two layers of insulation structure (first flange 220 and second flange 320) between the tabs and the cover body 100, the insulation effect between the tabs 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.

[0095] 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 will not occupy the internal space of the shell. The volume of the pole group is increased, and the energy density of the battery is large. And the pole ear shaping structure 312 on the second plastic body 310 can be used to gather the pole ear into the second through hole 311, and it plays a good guide when the pole ear passes through the second through hole 311. The overall shape of the pole ear is good, and it is not easy to short-circuit between the pole ear and the shell, and the safety of the battery is good. In addition, there are two layers of insulation structure of 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.

[0096] The remaining structures in this embodiment are the same as those in the first embodiment and will not be described in detail here.

[0097] 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 on one side of the cover body, the first plastic part comprising a first plastic part body, and a first through hole is provided on the first plastic part body; A second plastic part is arranged on the other side of the cover body, the second plastic part comprises a second plastic part body, a second through hole and a tab shaping structure are arranged on the second plastic part body, the tab shaping structure is arranged in the circumference of the second through hole, and the tab shaping structure is located on a side of the second plastic part body away from the cover body; 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 passes through the second through hole, the first mounting hole and the first through hole and is connected to the pole.

2. The battery cover assembly according to claim 1, characterized in that: The pole ear shaping structure includes two guide plates, which are respectively arranged on both sides of the second through hole along the first direction, and the two guide plates are inclined in the direction away from the axis of the second through hole, and along the direction away from the second through hole, a gradually widened bell mouth is formed between the two guide plates, the large end of the bell mouth faces the pole group, the small end of the bell mouth is connected to the second plastic body, and the pole ear is inserted into the bell mouth; The included angle between the guide plate and the axis of the second through hole is α, and the value range of α is 45°≤α≤87°.

3. The battery cover assembly according to claim 1, characterized in that: Along the first direction, a plurality of the first through holes are arranged at intervals on the first plastic body, a plurality of the second through holes and the tab shaping structure are arranged on the second plastic body, and the first through holes, the second through holes and the tab shaping structure correspond one to one.

4. The battery cover assembly according to claim 1, characterized in that: A support structure is provided on one side of the second plastic body close to the cover body, and the support structure includes a connecting plate and a support plate. The connecting plate is connected to the tab shaping structure, and the support plate is arranged on the end surface of the connecting plate close to the cover body, and the support plate abuts against the cover body.

5. The battery cover assembly according to claim 4, characterized in that: Along the first direction, the distance between the support plate and the tab shaping structure is e, and the value range of e is 0.5 mm ≤ e ≤ 20 mm; And / or, along the second direction, a distance between an end surface of the connecting plate facing away from the cover plate body and an end surface of the second plastic component body facing away from the cover plate body is f, and a value range of f is 0 mm ≤ f ≤ 2 mm.

6. The battery cover assembly according to claim 1, characterized in that: A first flange is provided around the first through hole and extends into the first mounting hole. A second flange is provided around the second through hole and extends into the first mounting hole and is connected to the first flange. One of the first flange and the second flange is in contact with the inner wall of the first mounting hole.

7. The battery cover assembly according to claim 6, 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; Or, 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; Or, 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.

8. 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 first plastic part body, and the lap joint is embedded in the sink groove and fits with the bottom wall of the sink groove; Wherein, along the second direction, the thickness of the cover body is H, the distance between the end surface of the overlap portion away from the second plastic part and the end surface of the cover body away from the second plastic part is b, and the value range of b satisfies: 0mm≤b≤0.5H; And / or, along the first direction, the width of the overlapping portion is c, and the value range of c satisfies: 0mm≤c≤10mm.

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: It comprises a shell, a pole group, and a battery cover assembly according to any one of claims 1 to 9, wherein the battery cover assembly is encapsulated at an opening of the shell, and the pole group is arranged in the shell.

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