Battery cover assembly and battery

Abstract

The present invention relates to the field of battery technology, and specifically discloses a battery cover assembly and a battery, wherein the battery cover assembly comprises a battery cover and a pole assembly, wherein the pole assembly comprises a first pole and a second pole, wherein the column portion of the first pole passes through a first mounting hole of the battery cover and is connected to the second pole, and the battery cover is clamped in the middle by the plate portion of the first pole and the second pole, thereby realizing assembly between the pole assembly and the battery cover. Since the first pole is installed from the side of the battery cover away from the pole group toward the side where the pole group is located, the connection between the first pole and the second pole is located on the side of the battery cover close to the pole group, when the first pole is subjected to pressure toward the side where the pole group is located, the column portion of the first pole will not fall out of the first mounting hole, thereby ensuring that the connection between the pole assembly and the battery cover is reliable and stable, which is beneficial to improving the safety of the battery. The present invention also provides a battery, comprising the above-mentioned battery cover 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] As lithium-ion battery technology becomes increasingly mature, lithium-ion batteries are widely used as power batteries in the field of electric vehicles. The battery cover of lithium-ion batteries is an important component of lithium-ion batteries. It not only provides protection for lithium-ion batteries in terms of safety and reliability, but also takes into account the connection between the internal chemical system of lithium-ion batteries and external modules.

[0003] The poles of existing lithium-ion batteries are generally made by machining processes, which have low material utilization, low processing efficiency, and high manufacturing costs. In addition, the poles and the battery cover are mostly riveted structures. The poles are first riveted to the riveting block, and then the two are laser welded to install the poles on the battery cover. The processing procedures are complicated and the process costs are high. In addition, since the riveting area and welding area of ​​the poles and the riveting block are both located on the side of the battery cover away from the pole group, when the poles located on the outside of the battery cover are subjected to a squeezing force toward the direction of the pole group, the riveting structure between the poles and the riveting block may fail, and the poles are at risk of detaching from the riveting block, which may cause short circuit overlap. In severe cases, it will cause the entire battery pack to fail, catch fire and explode, causing danger. Therefore, how to ensure a reliable connection between the battery cover and the poles has become a technical problem that needs to be solved urgently. Summary of the invention

[0004] The object of the present invention is to provide a battery cover assembly and a battery, wherein the pole assembly will not be separated from the battery cover when subjected to pressure from the outside of the battery cover, and the connection between the pole assembly and the battery cover is reliable and stable, which is conducive to improving the safety of the battery.

[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 battery cover is provided with a first mounting hole;

[0008] A pole assembly, comprising a first pole and a second pole, wherein the first pole comprises a plate portion and a column portion which are coaxially arranged, wherein the plate portion is located on a side of the battery cover away from the pole group, wherein the column portion passes through the first mounting hole and is connected to the second pole, wherein the second pole is located on a side of the battery cover close to the pole group, and is connected to the pole group;

[0009] An insulating sealing component, sandwiched between the pole component and the battery cover, used to insulate the pole component from the battery cover and seal the gap between the first pole and the first mounting hole;

[0010] In the first pole, the plate body includes a first flat plate layer and a second flat plate layer, the column body includes a first column layer and a second column layer, the first flat plate layer is connected to the first column layer, and the first column layer extends to the side where the pole group is located, the second flat plate layer is stacked on the side of the first flat plate layer close to the pole group, the second column layer is wrapped outside the first column layer, and the second flat plate layer is transitionally connected to the second column layer;

[0011] The sum of the volumes of the first flat plate layer and the first column layer is V1, the sum of the volumes of the second flat plate layer and the second column layer is V2, and V1>V2;

[0012] The total volume of the first pole is V, V=V1+V2, and the proportion of the sum of the volumes of the second flat layer and the second column layer V2 in the total volume V of the first pole satisfies: 0.1≤V2 / V<0.5.

[0013] Optionally, the second flat plate layer and the second column layer are transitionally connected via an inward concave arc, and a radius R of the inward concave arc satisfies: 0mm<R≤2mm.

[0014] Optionally, a boss is provided at the end of the second column layer facing the pole group, and the boss is connected to the second pole.

[0015] Optionally, the height of the first column layer is a, and the sum of the heights of the second column layer and the boss is b;

[0016] Among them, 0<a / b≤2.

[0017] Optionally, a second mounting hole is provided on the second pole, the boss is passed through the second mounting hole, and the peripheral side wall of the boss is welded to the inner wall of the second mounting hole;

[0018] And / or, the boss passes through the second mounting hole and is riveted to the second pole.

[0019] Optionally, a first step surface is formed between the peripheral side wall of the boss and the peripheral side wall of the second column layer, and an angle A is formed between the first step surface and the axis of the first pole, and the value range of A is 90°≤A≤180°.

[0020] Optionally, a second step surface is provided on the inner wall of the second mounting hole away from one end of the pole group, and an angle B is formed between the second step surface and the axis of the second pole, the axis of the first pole is parallel to the axis of the second pole, and the angle B is equal to the angle A.

[0021] Optionally, the first flat plate layer and the first column layer are made of aluminum material, and the second flat plate layer and the second column layer are made of copper material.

[0022] Optionally, the insulating sealing assembly comprises:

[0023] A first plastic part, the first plastic part is arranged on a side of the battery cover away from the electrode group, the column portion is penetrated by the first plastic part, the plate portion is in contact with an end surface of the first plastic part away from the electrode group, and the first plastic part insulates the first electrode column from the battery cover;

[0024] a second plastic part, the second plastic part being arranged on a side of the battery cover plate close to the electrode group, the column portion passing through the first plastic part, the first mounting hole and the second plastic part and connected to the second pole, the second pole being fitted to an end surface of the second plastic part close to the electrode group, and the second plastic part insulating and isolating the second pole from the battery cover plate;

[0025] A sealing member is sleeved on the column portion of the first pole, and the sealing member seals a gap between the first pole and the first mounting hole.

[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 an opening is formed on one side of the shell, the battery cover is sealed in the opening and connected to the shell, the pole group is arranged in the shell, and the pole group is connected to the second pole of the pole assembly.

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

[0028] The present invention provides a battery cover assembly, comprising a battery cover, a pole assembly and an insulating sealing assembly. The pole assembly comprises a first pole and a second pole, the pole body of the first pole passes through a first mounting hole of the battery cover and is connected to the second pole, the second pole is located on a side of the battery cover close to the pole group, the battery cover is sandwiched between the plate body of the first pole and the second pole, and the pole assembly and the battery cover are assembled. The insulating sealing assembly is sandwiched between the pole assembly and the battery cover to insulate the pole assembly from the battery cover and seal the gap between the first pole and the first mounting hole. Since the first pole is installed from the side of the battery cover away from the pole group toward the side where the pole group is located, the connection between the first pole and the second pole is located on the side of the battery cover close to the pole group, when the first pole is subjected to pressure toward the side where the pole group is located, the plate portion of the first pole will press the battery cover, and the column portion and the plate portion are integrally formed, so the column portion will not fall out of the first mounting hole on the battery cover, thereby ensuring a reliable and stable connection between the pole assembly and the battery cover, which is beneficial to improving the safety of the battery.

[0029] The present invention also provides a battery, comprising a shell, a pole group, and the above-mentioned battery cover assembly, wherein an opening is formed on one side of the shell, the battery cover is sealed in the opening and connected to the shell, the pole group is arranged in the shell, and the pole group is connected to the second pole of the pole assembly. By adopting the above-mentioned battery cover assembly, it can be ensured that the pole assembly will not be separated from the battery cover when subjected to pressure from the outside of the battery cover, and the connection between the pole assembly and the battery cover is reliable and stable, which is conducive to improving the safety of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 An exploded view of a battery cover assembly in an embodiment of the present invention;

[0031] Figure 2 is a cross-sectional view of a battery cover assembly in an embodiment of the present invention;

[0032] Figure 3 for Figure 2 A partial enlarged view of the middle A;

[0033] Figure 4 is a schematic structural diagram of a first pole in an embodiment of the present invention;

[0034] Figure 5 is a cross-sectional view of a first pole in an embodiment of the present invention;

[0035] Figure 6 is a cross-sectional view of a second pole in an embodiment of the present invention;

[0036] Figure 7 Schematic diagram of the structure of the sealing member in an embodiment of the present invention.

[0037] In the figure:

[0038] 100, battery cover; 101, first mounting hole; 102, first limiting groove; 103, first limiting flange; 200, pole assembly; 210, first pole; 211, plate body; 2111, first flat layer; 2112, second flat layer; 212, column body; 2121, first column layer; 2122, second column layer; 2123, concave arc; 213, boss; 2131, first step surface ; 220, second pole; 221, second mounting hole; 2211, second step surface; 2212, sink; 300, first plastic part; 301, third mounting hole; 302, second limiting groove; 400, second plastic part; 401, fourth mounting hole; 402, third limiting groove; 403, second limiting flange; 500, sealing part; 510, first sealing portion; 520, second sealing portion; 521, fifth mounting hole. DETAILED DESCRIPTION

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] Generally speaking, batteries include a shell and a battery cover. An opening is provided at one end of the shell, and an installation space for placing the pole group is formed inside the shell. The battery cover is buckled at the opening of the shell and welded to the shell, thereby encapsulating the pole group in the shell. However, in the prior art, the pole and the battery cover are usually assembled by riveting and welding. On the one hand, the processing procedures are complicated and the process costs are high; on the other hand, since the riveting area and welding area of ​​the pole and the riveting block are both located on the side of the battery cover away from the pole group, when the pole located on the outside of the battery cover is subjected to a squeezing force toward the direction of the pole group, the riveting structure between the pole and the riveting block may fail, and the pole has the risk of detaching from the riveting block, which may cause a short circuit overlap. In severe cases, the entire battery pack will fail, catch fire and explode, causing danger.

[0044] To this end, the present invention provides a battery cover assembly to solve the above problems.

[0045] Specifically, Figure 1-Figure 3As shown, this embodiment provides a battery cover assembly, including a battery cover 100, a pole assembly 200 and an insulating sealing assembly. Among them, the battery cover 100 is provided with a first mounting hole 101, the pole assembly 200 includes a first pole 210 and a second pole 220, the first pole 210 includes a plate body 211 and a column body 212 arranged coaxially, the plate body 211 is located on the side of the battery cover 100 away from the pole group, the column body 212 passes through the first mounting hole 101 and is connected to the second pole 220, the second pole 220 is located on the side of the battery cover 100 close to the pole group, the battery cover 100 is sandwiched between the plate body 211 of the first pole 210 and the second pole 220, the assembly between the pole assembly 200 and the battery cover 100 is realized, the second pole 220 is connected to the pole group, thereby the pole group can be connected to the external circuit through the pole assembly 200, which is convenient for charging and discharging of the battery. The insulating sealing component is clamped between the pole assembly 200 and the battery cover 100. The insulating sealing component can insulate the pole assembly 200 from the battery cover 100 to avoid the risk of short circuit. At the same time, the insulating sealing component can seal the gap between the first pole 210 and the first mounting hole 101 to prevent leakage of electrolyte or gas.

[0046] It should be noted that, since the first pole 210 in this embodiment is installed from the side of the battery cover 100 away from the pole group toward the side where the pole group is located, when the first pole 210 is subjected to pressure toward the side where the pole group is located, the plate body 211 of the first pole 210 will press the battery cover 100, and the column body 212 is integrally formed with the plate body 211, so the column body 212 will not fall out of the first mounting hole 101 on the battery cover 100. In addition, the connection between the first pole 210 and the second pole 220 is located on the side of the battery cover 100 close to the pole group and will not be subjected to external pressure, thereby ensuring that the connection between the pole assembly 200 and the battery cover 100 is reliable and stable, which is conducive to improving the safety of the battery.

[0047] See also Figure 4 and Figure 5In this embodiment, the first pole 210 is a composite pole. In the first pole 210, the plate body 211 includes a first flat layer 2111 and a second flat layer 2112, and the column body 212 includes a first column layer 2121 and a second column layer 2122. The first flat layer 2111 is connected to the first column layer 2121, and the first column layer 2121 extends to the side where the pole group is located. The second flat layer 2112 is stacked on the side of the first flat layer 2111 close to the pole group, and the second column layer 2122 is wrapped outside the first column layer 2121, and the second flat layer 2112 is transitionally connected to the second column layer 2122. The first flat layer 2111 and the first column layer 2121 are made of a first metal material, that is, the first flat layer 2111 and the first column layer 2121 constitute a first metal material layer, the second flat layer 2112 and the second column layer 2122 are made of a second metal material, that is, the second flat layer 2112 and the second column layer 2122 constitute a second metal material layer, and the second flat layer 2112 and the first flat layer 2111 are made of different metal materials. Exemplarily, the first pole 210 can be integrally formed by using a composite material plate using a mold pier pressing or stamping process. The mold for making the first pole 210 includes a first cavity for making the plate body 211 and a second cavity for making the column body 212. Before the composite material plate is pressed or punched, the composite material plate includes a first flat layer 2111 and a second flat layer 2112. After being pressed or punched by a mold, the first flat layer 2111 freely extends to one side in the second cavity of the mold to form a first column layer 2121. The second flat layer 2112 forms a second column layer 2122 on the same side of the first column layer 2121 due to the limitation of the second cavity of the mold, and the second column layer 2122 is wrapped outside the first column layer 2121. By setting the first pole 210 as a composite pole, the conductivity and current-carrying performance of the pole assembly 200 can be improved while reducing costs and weight. In addition, the first pole 210 does not require additional machining processes, which improves production efficiency.

[0048] Optionally, the sum of the volumes of the first flat layer 2111 and the first column layer 2121 is V1, the sum of the volumes of the second flat layer 2112 and the second column layer 2122 is V2, and V1>V2. The total volume of the first pole 210 is V, V=V1+V2, and the sum of the volumes of the second flat layer 2112 and the second column layer 2122 V2 in the total volume V of the first pole 210 satisfies: 0.1≤V2 / V<0.5. Exemplarily, the value of V2 / V can be 0.1, 0.2, 0.3, 0.4, etc. Preferably, it is 0.3. By controlling the proportion of V2 in V within the above range, it can be ensured that when the composite material plate is pressed or stamped, there will be no fault between the second flat layer 2112 and the second column layer 2122, and the second flat layer 2112 and the second column layer 2122 on the side of the first pole 210 close to the pole group are continuous second metal material layers, so that the first flat layer 2111 or the first column layer 2121 is prevented from being exposed, and the pass rate of the first pole 210 for pressing or stamping is high, and the performance of the first pole 210 is better. It should be noted that when a fault occurs between the second flat layer 2112 and the second column layer 2122, the first metal material layer composed of the first flat layer 2111 and the first column layer 2121 and the second metal material layer composed of the second flat layer 2112 and the second column layer 2122 will be subjected to tensile stress, and there is a risk of separation between the two metal material layers of the first pole 210, and the first pole 210 fails to be pressed or stamped, and the performance of the first pole 210 obtained is poor.

[0049] Furthermore, the second flat layer 2112 and the second column layer 2122 are transitionally connected by an inward concave arc 2123, and the inward concave arc 2123 can be formed by a transition portion of a mold at the connection between the first cavity and the second cavity. By setting the inward concave arc 2123, it is convenient to demould the first pole 210 after piercing or stamping, and it is also convenient for the first pole 210 to be formed, ensuring that the second flat layer 2112 and the second column layer 2122 are continuous and there is no fault. Optionally, the radius R of the inward concave arc 2123 satisfies: 0mm<R≤2mm. Exemplarily, the radius R of the inward concave arc 2123 can be 0.5mm, 0.8mm, 1.0mm, 1.2mm, 1.5mm, 1.8mm or 2.0mm, etc., which are not listed here one by one. Preferably it is 1.0mm.

[0050] As an optional solution, the first flat layer 2111 and the first column layer 2121 in this embodiment are made of aluminum material, that is, the first metal material layer is made of aluminum material, and the second flat layer 2112 and the second column layer 2122 are made of copper material, that is, the second metal material layer is made of copper material. The copper material can ensure the conductivity and current-carrying performance of the first pole 210, and the aluminum material can reduce costs and reduce weight. Furthermore, the second pole 220 is also made of copper material. By selecting the same material for the second pole 220 and the second metal material layer, it is convenient to perform welding, riveting and other operations between the two, thereby ensuring a reliable connection between the second pole 220 and the first pole 210.

[0051] See also Figure 3-Figure 6 In this embodiment, the second column layer 2122 is columnar, and a boss 213 is provided at the end of the second column layer 2122 facing the pole group. The boss 213 and the second column layer 2122 are made of the same material, and the boss 213 is used to connect with the second pole 220. The height of the first column layer 2121 is a, and the sum of the heights of the second column layer 2122 and the boss 213 is b, 0<a / b≤2. Exemplarily, the value of a / b can be 0.1, 0.2, 0.5, 0.8, 1.0, 1.5, 2.0, etc. Preferably it is 1.5. By adopting the above arrangement, the height of the second metal material layer is increased, so as to ensure that when the composite material plate is pierced or stamped, there will be no fault between the second flat layer 2112 and the second column layer 2122, so as to ensure that the performance of the first pole 210 is good and the qualified rate of processing and manufacturing is high.

[0052] Optionally, in some embodiments, a second mounting hole 221 is provided on the second pole 220, the boss 213 is passed through the second mounting hole 221, and the peripheral side wall of the boss 213 is welded to the inner wall of the second mounting hole 221, thereby achieving a fixed connection between the boss 213 and the second pole 220.

[0053] In other embodiments, the boss 213 may also be riveted to the second pole 220 after passing through the second mounting hole 221, and then the peripheral side wall of the boss 213 is welded to the inner wall of the second mounting hole 221, thereby achieving a fixed connection between the boss 213 and the second pole 220. When this fixing method is adopted, since two fixing connection methods of riveting and welding are adopted, the reliability and stability of the connection between the first pole 210 and the second pole 220 are further improved.

[0054] Furthermore, a countersunk platform 2212 is provided at one end of the second mounting hole 221 of the second pole 220 close to the pole group, and the boss 213 of the first pole 210 can be riveted to the bottom wall of the countersunk platform 2212, and then the boss 213 is welded to the side wall of the countersunk platform 2212, so that the column portion 212 of the first pole 210 will not exceed the end surface of the second pole 220 close to the pole group, thereby playing a certain protective role for the column portion 212 of the first pole 210, and because the riveting area and the welding area between the first pole 210 and the second pole 220 are both located on the side of the battery cover 100 close to the pole group, it is possible to avoid as much as possible the decrease in the connection strength between the first pole 210 and the second pole 220 due to collision of the first pole 210, which is conducive to ensuring a stable and reliable connection between the two.

[0055] Optionally, in the first pole 210, a first step surface 2131 is formed between the peripheral side wall of the boss 213 and the peripheral side wall of the second column layer 2122, and an angle A is formed between the first step surface 2131 and the axis of the first pole 210, and the value range of A is 90°≤A≤180°. Exemplarily, the value of A can be 90°, 130°, 140°, 150°, 160°, 170°, 180°, etc. More preferably, the value range of A is 135°≤A≤165°. By setting the first step surface 2131, on the one hand, it can play a good guiding role when the column portion 212 of the first pole 210 penetrates the first mounting hole 101 and the second mounting hole 221; on the other hand, during the molding process of the first pole 210, it is convenient to demould the first pole 210, and at the same time, it is avoided that metal wires are formed on the peripheral side walls of the column portion 212 during the demoulding process, which affects the appearance of the finished product of the first pole 210.

[0056] Furthermore, a second step surface 2211 is provided on the inner wall of the second mounting hole 221 away from the pole group, and an angle B is formed between the second step surface 2211 and the axis of the second pole 220, the axis of the first pole 210 is parallel to the axis of the second pole 220, and the angle B is equal to the angle A. Therefore, after the boss 213 penetrates into the second mounting hole 221 of the second pole 220, the second step surface 2211 can fit with the first step surface 2131, which plays a limiting role on the first pole 210, and prevents the column portion 212 of the first pole 210 from penetrating the end surface of the second pole 220 close to the pole group.

[0057] In addition, it should be noted that along the radial direction of the second mounting hole 221 ( Figure 5 , Figure 6In the X-axis direction of the second mounting hole 221, there is a small clearance between the boss 213 and the inner wall of the second mounting hole 221, so that the boss 213 can smoothly penetrate into the second mounting hole 221 for easy assembly. Exemplarily, along the radial direction of the second mounting hole 221, the single-side clearance between the peripheral side wall of the boss 213 and the inner wall of the second mounting hole 221 is 0.05mm-0.10mm. For example, the single-side clearance can be 0.05mm, 0.08mm or 0.10mm, etc., which are not listed here one by one.

[0058] Continue to see Figure 1-Figure 3 The insulating sealing assembly in this embodiment includes a first plastic part 300, a second plastic part 400 and a sealing part 500, wherein the first plastic part 300 is arranged on the side of the battery cover plate 100 away from the electrode group, and the first plastic part 300 is provided with a third mounting hole 301. The second plastic part 400 is arranged on the side of the battery cover plate 100 close to the electrode group, and the second plastic part 400 is provided with a fourth mounting hole 401. The sealing part 500 is annular, and the sealing part 500 is provided with a fifth mounting hole 521.

[0059] During installation, the column portion 212 of the first pole 210 passes through the third mounting hole 301 of the first plastic part 300, the first mounting hole 101 of the battery cover 100, the fourth mounting hole 401 of the second plastic part 400, the fifth mounting hole 521 of the seal 500, and the second mounting hole 221 of the second pole 220 in sequence, and then the column portion 212 of the first pole 210 is riveted and welded with the second pole 220, so that the pole assembly 200 is assembled on the battery cover 100. At this time, the plate portion 211 of the first pole 210 is in contact with the end face of the first plastic part 300 away from the pole group, and the first pole 210 is insulated and isolated from the battery cover 100 by the first plastic part 300. The second pole 220 is in contact with the end face of the second plastic part 400 close to the pole group, and the second pole 220 is insulated and isolated from the battery cover 100 by the second plastic part 400. Furthermore, the seal 500 is sandwiched between the first pole 210 and the battery cover 100 , and the gap between the first pole 210 and the first mounting hole 101 is sealed by the seal 500 , while achieving insulation between the first pole 210 and the battery cover 100 .

[0060] For example, the first plastic part 300 can be made of PPS material (polyphenylene sulfide), which has the advantages of high mechanical strength, high temperature resistance, corrosion resistance, good thermal stability, excellent electrical properties, etc., and its resistance value range is greater than 200MΩ, thereby ensuring better insulation performance between the first pole 210 and the battery cover 100. The second plastic part 400 can be made of the same material as the first plastic part 300, thereby ensuring better insulation performance between the second pole 220 and the battery cover 100.

[0061] As an alternative, see Figure 2 , Figure 3 and Figure 7 In this embodiment, the sealing member 500 includes a first sealing portion 510 and a second sealing portion 520. The first sealing portion 510 is arranged around the circumference of the second sealing portion 520. A fifth mounting hole 521 is formed at the center of the second sealing portion 520. The column portion 212 of the first pole 210 is passed through the fifth mounting hole 521. When the sealing member 500 is assembled with the battery cover 100, the pole assembly 200, the first plastic part 300 and the second plastic part 400, the radial direction of the first mounting hole 101 (i.e. Figure 2 The two sides of the second sealing portion 520 are respectively pressed against the peripheral side wall of the column portion 212 of the first pole 210 and the inner wall of the first mounting hole 101, thereby sealing the gap between the first pole 210 and the first mounting hole 101; along the axial direction of the first mounting hole 101 (i.e. Figure 2 In the Z-axis direction shown in FIG, two ends of the first sealing portion 510 are respectively pressed against the battery cover plate 100 and the second pole 220, thereby sealing the gap between the battery cover plate 100 and the second pole 220.

[0062] Continue to see Figure 1-Figure 3In this embodiment, the battery cover 100 is provided with a first limiting groove 102 on the side away from the electrode group, and the first plastic part 300 is embedded in the first limiting groove 102 on the side close to the electrode group. The first limiting groove 102 can limit the position of the first plastic part 300, ensuring the accurate positioning between the first plastic part 300 and the battery cover 100. The first plastic part 300 is provided with a second limiting groove 302 on the side away from the electrode group, and the plate body 211 of the first pole 210 is embedded in the second limiting groove 302. The second limiting groove 302 can limit the relative position between the first pole 210 and the first plastic part 300, ensuring the accurate positioning between the first pole 210 and the first plastic part 300 and the battery cover 100. Further, a third limiting groove 402 is provided on the side of the second plastic part 400 away from the pole group, and a first limiting flange 103 is provided on the side of the battery cover plate 100 facing the pole group. The first limiting flange 103 is located in the circumference of the first mounting hole 101, and the first limiting flange 103 is embedded in the third limiting groove 402. Through the cooperation of the third limiting groove 402 and the first limiting flange 103, the positioning between the battery cover plate 100 and the second plastic part 400 is accurate. A second limiting flange 403 is also provided on the side of the second plastic part 400 close to the pole group, and the second limiting flange 403 abuts against the peripheral side wall of the second pole 220. The second limiting flange 403 can limit the position of the second pole 220, ensuring that the positioning between the second plastic part 400 and the second pole 220 is accurate. In summary, by setting the above-mentioned limiting structure, the battery cover 100, the first pole 210, the second pole 220, the first plastic part 300, and the second plastic part 400 are accurately positioned, ensuring that the overall assembly accuracy of the battery cover assembly is high and the assembly between the components is good.

[0063] This embodiment also provides a battery, including a shell, a pole group, and the above-mentioned battery cover assembly, an opening is formed on one side of the shell, the battery cover 100 is blocked in the opening and connected to the shell, the pole group is arranged in the shell, and the pole group is connected to the second pole 220 of the pole assembly 200. By adopting the above-mentioned battery cover assembly, it can be ensured that the pole assembly 200 will not be separated from the battery cover 100 when subjected to pressure from the outside of the battery cover 100, and the connection between the pole assembly 200 and the battery cover 100 is reliable and stable, which is conducive to improving the safety of the battery. And by setting the first pole 210 in the pole assembly 200 as a composite pole, while improving the conductivity and current-passing performance of the pole assembly 200, it can also reduce costs and reduce weight, which is conducive to improving the energy density of the battery.

[0064] Optionally, the pole group has a pole ear, and the pole ear and the second pole 220 can be directly welded. Alternatively, in other embodiments, the pole ear and the second pole 220 can also be connected through a connecting piece, that is, the two ends of the connecting piece are respectively welded to the pole ear and the second pole 220, thereby achieving conductive communication between the pole group and the pole assembly 200. After the pole assembly 200 is connected to the external circuit, the electric energy of the pole group can be released or the pole group can be stored.

[0065] The first poles 210 in some specific implementation schemes are tested below to explore the influence of the structural dimension setting of the first pole 210 on its molding and performance.

[0066] First, Table 1 shows the influence of different values ​​of V2 / V on the formation and performance of the first pole 210.

[0067] Table 1

[0068]

[0069] As shown in the above table, in comparative example 1, the value of V2 / V is less than the minimum value in the range of 0.1≤V2 / V<0.5. At this time, the second flat layer 2112 and the second column layer 2122 account for a small proportion in the first pole 210. When the composite material plate is pressed or stamped, the molding effect of the first pole 210 is not good. There is a fault problem between the second flat layer 2112 and the second column layer 2122. There is a risk of separation between the first column layer 2121 and the second column layer 2122. The first pole 210 is unqualified in pressing or stamping, and the performance of the first pole 210 is poor.

[0070] In Comparative Examples 2 and 3, the value of V2 / V is greater than the maximum value in the range of 0.1≤V2 / V<0.5. At this time, the second flat layer 2112 and the second column layer 2122 account for a large proportion in the first pole 210, that is, the copper material accounts for a large proportion in the first pole 210, the cost of the composite material plate is high, and the weight of the first pole 210 increases, which is not conducive to weight reduction of the first pole 210, the energy density of the battery decreases, and the performance of the first pole 210 is poor.

[0071] In Example 1, Example 2 and Example 3, the value of V2 / V is within the range of 0.1≤V2 / V<0.5, at which time the forming requirements of the first pole 210 are met, the forming effect of the first pole 210 is better, there is no fault problem between the second flat layer 2112 and the second column layer 2122, the first pole 210 is qualified for pier pressing or stamping, and the performance of the first pole 210 is good. In addition, since the proportion of aluminum material in the first pole 210 is relatively large, the cost of the composite material plate is reduced, the weight reduction effect of the first pole 210 is obvious, the energy density of the battery is increased, and the performance of the first pole 210 is good. Among them, when the value of V2 / V is 0.3, the forming effect of the first pole 210 is the best, the second flat layer 2112 and the second column layer 2122 are evenly distributed in the first pole 210, the performance of the first pole 210 is the best, and the conductive performance, the current-passing performance and the weight reduction effect are all significantly improved.

[0072] Table 2 shows the influence of different values ​​of R on the forming of the first pole 210 .

[0073] Table 2

[0074]

[0075] As shown in the above table, in comparative example 1, the value of R is 0 mm, and the value of R is less than the minimum value in the range of 0 mm<R≤2 mm. At this time, the mold for making the first pole 210 cannot be processed and manufactured, and the connection between the first cavity and the second cavity needs to be connected through a transition portion. In addition, if the concave arc 2123 is not provided on the first pole 210, when the composite material plate is pressed or stamped, the molding effect of the first pole 210 is not good, and there may be a fault problem between the second flat layer 2112 and the second column layer 2122, resulting in tensile stress between the first column layer 2121 and the second column layer 2122. The first pole 210 is unqualified in pressing or stamping, and the performance of the first pole 210 is poor.

[0076] In comparative example 2, the value of R is 2.5 mm, which is greater than the maximum value in the range of 0 mm<R≤2 mm. At this time, the concave arc 2123 will occupy the radial space at the connection between the column portion 212 and the plate portion 211 in the first pole 210, which is not conducive to the molding of the first pole 210, and the qualified rate of the first pole 210 by piercing or stamping is low.

[0077] In Example 1, Example 2, Example 3 and Example 4, the value of R is within the range of 0mm<R≤2mm, at which time the forming requirements of the first pole 210 are met, the forming effect of the first pole 210 is better, there is no fault problem between the second flat layer 2112 and the second column layer 2122, the pass rate of the first pole 210 in the piercing or stamping forming is high, and the performance of the first pole 210 is good. Among them, when the value of R is 1.0mm, the forming effect of the first pole 210 is the best, and the second flat layer 2112 and the second column layer 2122 are evenly distributed in the first pole 210.

[0078] Table 3 shows the influence of different values ​​of a / b on the forming and performance of the first pole 210 .

[0079] Table 3

[0080]

[0081] As shown in the table above, in Comparative Example 1, the value of a / b is 0, and the value of a / b is less than the minimum value in the range of 0<a / b≤2. At this time, the height of the column portion 212 of the first pole 210 is 0 mm, the first pole 210 cannot be assembled with the second pole 220 and the battery cover 100, the battery cover assembly cannot be assembled, the first pole 210 is unqualified, and the pole assembly 200 cannot realize the function of extracting the electric energy of the pole group, and the performance of the first pole 210 cannot meet the requirements.

[0082] In comparative example 2, the value of a / b is greater than the maximum value in the range of 0<a / b≤2. At this time, the stretched height of the column portion 212 in the first pole 210 is too large, and there may be a fault problem between the second flat layer 2112 and the second column layer 2122. The forming effect of the first pole 210 is not good, and the qualified rate of the first pole 210 in the piercing or stamping forming is low. And when there is a fault problem between the second flat layer 2112 and the second column layer 2122, there is a risk of separation between the first column layer 2121 and the second column layer 2122, and the performance of the first pole 210 is poor.

[0083] In Example 1, Example 2, Example 3 and Example 4, the value of a / b is within the range of 0<a / b≤2, at which time the forming requirements of the first pole 210 are met, the forming effect of the first pole 210 is better, there is no fault problem between the second flat layer 2112 and the second column layer 2122, the pass rate of the first pole 210 in the piercing or stamping forming is high, and the performance of the first pole 210 is good. Among them, when the value of a / b is 1.5, the forming effect of the first pole 210 is the best, the second flat layer 2112 and the second column layer 2122 are evenly distributed in the first pole 210, the performance of the first pole 210 is the best, and the first pole 210 is best assembled with the battery cover 100 and the second pole 220.

[0084] 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 battery cover is provided with a first mounting hole; A pole assembly, comprising a first pole and a second pole, wherein the first pole comprises a plate portion and a column portion which are coaxially arranged, wherein the plate portion is located on a side of the battery cover away from the pole group, wherein the column portion passes through the first mounting hole and is connected to the second pole, wherein the second pole is located on a side of the battery cover close to the pole group, and is connected to the pole group; An insulating sealing component, sandwiched between the pole component and the battery cover, used to insulate the pole component from the battery cover and seal the gap between the first pole and the first mounting hole; In the first pole, the plate body includes a first flat plate layer and a second flat plate layer, the column body includes a first column layer and a second column layer, the first flat plate layer is connected to the first column layer, and the first column layer extends to the side where the pole group is located, the second flat plate layer is stacked on the side of the first flat plate layer close to the pole group, the second column layer is wrapped outside the first column layer, and the second flat plate layer is connected to the second column layer; The first flat plate layer and the first column layer are made of aluminum, the second flat plate layer and the second column layer are made of copper, the sum of the volumes of the first flat plate layer and the first column layer is V1, the sum of the volumes of the second flat plate layer and the second column layer is V2, and V1>V2; The total volume of the first pole is V, V=V1+V2, and the sum of the volumes of the second flat layer and the second column layer V2 accounts for the total volume V of the first pole: 0.1≤V2 / V<0.5; The second column layer is provided with a boss at the end facing the pole group, and the boss is connected to the second pole; the second pole is provided with a second mounting hole, and the boss is passed through the second mounting hole, and a first step surface is formed between the peripheral side wall of the boss and the peripheral side wall of the second column layer, and an angle A is formed between the first step surface and the axis of the first pole; The value range of A is 130°≤A≤165°; A second step surface is provided on the inner wall of the second mounting hole at one end away from the pole group, an angle B is formed between the second step surface and the axis of the second pole, the axis of the first pole is parallel to the axis of the second pole, and the angle B is equal to the angle A; The height of the first column layer is a, and the sum of the heights of the second column layer and the boss is b; Among them, 0<a / b≤2.

2. The battery cover assembly according to claim 1, characterized in that: The second flat plate layer and the second column layer are connected by an inward concave arc transition, and the radius R of the inward concave arc satisfies: 0mm<R≤2mm.

3. The battery cover assembly according to claim 1, characterized in that: The peripheral side wall of the boss is welded to the inner wall of the second mounting hole; And / or, the boss passes through the second mounting hole and is riveted to the second pole.

4. The battery cover assembly according to any one of claims 1 to 3, characterized in that: The insulating sealing assembly comprises: A first plastic part, the first plastic part is arranged on a side of the battery cover away from the electrode group, the column portion is penetrated by the first plastic part, the plate portion is in contact with an end surface of the first plastic part away from the electrode group, and the first plastic part insulates the first electrode column from the battery cover; a second plastic part, the second plastic part being arranged on a side of the battery cover plate close to the electrode group, the column portion passing through the first plastic part, the first mounting hole and the second plastic part and connected to the second pole, the second pole being fitted to an end surface of the second plastic part close to the electrode group, and the second plastic part insulating and isolating the second pole from the battery cover plate; A sealing member is sleeved on the column portion of the first pole, and the sealing member seals a gap between the first pole and the first mounting hole.

5. A battery, characterized in that: It comprises a shell, a pole group, and a battery cover assembly as described in any one of claims 1 to 4, wherein an opening is formed on one side of the shell, the battery cover is sealed in the opening and connected to the shell, the pole group is arranged in the shell, and the pole group is connected to the second pole of the pole assembly.

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