Battery cover plate assembly, battery, battery pack and electric equipment

Abstract

The invention relates to a battery cover plate assembly, a battery, a battery pack and electric equipment, the battery cover plate assembly comprises a cover plate main body, a first leading-out piece, a second leading-out piece and a plurality of pole columns, the first leading-out piece is used for leading out a positive electrode or a negative electrode of the battery, and the second leading-out piece is used for being connected with a battery cell of the battery; the first leading-out piece and the second leading-out piece are respectively located at two opposite sides of the cover plate main body, the pole columns penetrate through the cover plate main body, the plurality of pole columns are connected in parallel between the first leading-out piece and the second leading-out piece, the plurality of pole columns comprise a first pole column and a second pole column, and the first pole column and the second pole column are connected in parallel. And the impedance of the second pole is smaller than that of the first pole. According to the battery cover plate assembly provided by the invention, the temperature rise of the pole can be reduced, the temperature of the pole is prevented from being too high, and good performance of the battery can be maintained.

Description

Technical Field

[0001] The present disclosure relates to the field of battery technology, and in particular, to a battery cover assembly, a battery, a battery pack, and an electrical device. Background Art

[0002] At present, the cover of the battery cover assembly is generally provided with a lead-out piece, which is usually electrically connected to the lead-out piece on the battery cell through the pole, so as to output the electrical energy in the battery cell to the outside world. In related technologies, when the battery is working, for example, when the battery is rapidly charged at a high rate, the pole is prone to generate heat, causing its own temperature to rise, and even causing the pole temperature to be too high, which affects the performance of the battery. Summary of the Invention

[0003] The purpose of the present disclosure is to provide a battery cover assembly, which can reduce the temperature rise of the pole, avoid excessive temperature of the pole, and help maintain good performance of the battery.

[0004] In order to achieve the above-mentioned purpose, according to the first aspect of the present disclosure, a battery cover assembly is provided, including a cover body, a first lead-out piece, a second lead-out piece and a plurality of poles, the first lead-out piece is used to lead out the positive or negative pole of the battery, the second lead-out piece is used to connect to the battery cell, the first lead-out piece and the second lead-out piece are respectively located on opposite sides of the cover body, the pole is passed through the cover body, and the plurality of poles are connected in parallel between the first lead-out piece and the second lead-out piece, wherein the plurality of poles include a first pole and a second pole, and the impedance of the second pole is less than the impedance of the first pole.

[0005] Optionally, the first pole is made of a first preset material, and the second pole is made of a second preset material, and the impedance of the second preset material is smaller than the impedance of the first preset material, so that the impedance of the second pole is smaller than the impedance of the first pole.

[0006] Optionally, the second preset material includes at least one of gold, copper, and silver.

[0007] Optionally, the first preset material includes a copper-aluminum composite material.

[0008] Optionally, a cross-sectional area of the second pole is smaller than a cross-sectional area of the first pole.

[0009] Optionally, a ratio of a cross-sectional area of the second pole to a cross-sectional area of the first pole is 0.4-0.6.

[0010] Optionally, a ratio of a cross-sectional area of the second pole to a cross-sectional area of the first pole is 0.5.

[0011] Optionally, the plurality of poles include at least two first poles and at least one second pole, and the second pole is arranged between two adjacent first poles.

[0012] Optionally, the pole has a first end and a second end that are oppositely arranged in the axial direction, the first end is connected to the first lead-out piece, the second end is connected to the second lead-out piece, and two adjacent poles are spaced apart.

[0013] Optionally, the battery cover assembly also includes a first insulating seat, which is arranged between the cover body and the first lead-out piece to provide insulation between the cover body and the first lead-out piece. The first insulating seat is provided with a first through hole, and the pole is passed through the first through hole.

[0014] Optionally, the battery cover assembly also includes a second insulating seat, which is located between the cover body and the first lead-out piece to provide insulation between the cover body and the first lead-out piece. The second insulating seat is provided with a second through hole, and the pole is passed through the second through hole.

[0015] Optionally, the battery cover assembly further includes an insulating sleeve, a third through hole is opened on the cover body, the pole is passed through the third through hole, the insulating sleeve is arranged in the third through hole, and is used to provide insulation between the cover body and the pole.

[0016] According to a second aspect of the present disclosure, a battery is provided, comprising the battery cover assembly as described above.

[0017] According to a third aspect of the present disclosure, a battery pack is provided, comprising the battery as described above.

[0018] According to a fourth aspect of the present disclosure, there is provided an electric device comprising the battery pack as described above.

[0019] The technical solution provided by the embodiments of the present disclosure may include the following beneficial effects: in the battery cover assembly provided by the present disclosure, a plurality of poles are provided, and the plurality of poles are connected in parallel between the first lead-out piece and the second lead-out piece. Based on the fact that the total parallel resistance is less than any branch resistance in the circuit, compared with the implementation in the related art in which only the first pole is provided between the first lead-out piece and the second lead-out piece, the present application provides the second pole in parallel with the first pole, and by making the impedance of the second pole less than the impedance of the first pole, the resistance of the second pole can be made less than the resistance of the first pole, thereby making the total resistance of the plurality of poles less than the resistance of the second pole, thereby effectively reducing the total resistance of the plurality of poles, thereby effectively reducing the heat generated by the plurality of poles when the battery is rapidly charged at a high rate, thereby reducing the temperature rise of the poles, avoiding excessive temperature of the poles, and helping to maintain good performance of the battery.

[0020] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following detailed description, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings: Figure 1 is a structural schematic diagram of a battery cover assembly provided by an embodiment of the present disclosure; Figure 2 is a cross-sectional view of a battery cover assembly provided by an embodiment of the present disclosure; Figure 3 yes Figure 2 A partial enlarged view of point A in the middle; Figure 4 is an exploded view of a battery cover assembly provided by an embodiment of the present disclosure; Figure 5 Schematic diagram of the structure of the pole of the battery cover assembly provided by an embodiment of the present disclosure; Figure 6 This is an experimental diagram showing the relationship between the material of the second pole of the battery cover assembly provided by an embodiment of the present disclosure and the total impedance reduction ratio of multiple poles and the temperature drop of multiple poles; Figure 7 This is an experimental diagram showing the relationship between the material of the second pole of the battery cover assembly provided by an embodiment of the present disclosure and the total impedance reduction ratio of multiple poles; Figure 8 This is an experimental diagram of the relationship between the second pole material of the battery cover assembly provided by the embodiment of the present disclosure and the temperature drop of multiple poles.

[0022] Description of Reference Numerals 1-cover body; 11-third through-hole; 2-first lead-out piece; 21-perforation; 3-first pole; 4-second pole; 5-second lead-out piece; 51-fourth through-hole; 6-first insulating seat; 61-first through-hole; 62-mounting slot; 7-second insulating seat; 71-second through-hole; 8-insulating sleeve; 10-first shaft section; 101-first end; 20-second shaft section; 30-third shaft section; 40-fourth shaft section; 401-second end; 100-battery cover assembly. DETAILED DESCRIPTION

[0023] The following describes the specific embodiments of the present disclosure in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present disclosure and are not intended to limit the present disclosure.

[0024] In this disclosure, unless otherwise indicated, the terms "first," "second," and the like are used to distinguish one element from another and do not imply order or importance. Furthermore, in the following description, when referring to the accompanying drawings, unless otherwise indicated, identical reference numerals in different drawings denote identical or similar elements. The above definitions are intended solely to explain and illustrate this disclosure and should not be construed as limiting the disclosure.

[0025] It should be noted that in a circuit with resistance, inductance and capacitance, the obstruction to the current in the circuit is called impedance. Impedance is a complex number, the real part is called resistance, and the imaginary part is called reactance. Among them, the obstruction of the capacitor to the alternating current in the circuit is called capacitive reactance, and the obstruction of the inductor to the alternating current in the circuit is called inductive reactance. The obstruction caused by capacitance and inductance to the alternating current in the circuit is collectively called reactance. In a DC circuit, the relationship between resistance and impedance is equivalent, because there is no reactance (inductive reactance and capacitive reactance) component in the DC circuit, so the impedance is equal to the resistance.

[0026] In the present disclosure, since the battery generates direct current, the impedance of the pole can be approximated to the resistance of the pole, and the total parallel impedance of the poles is approximated to the total parallel resistance of the poles. Based on the above, the present disclosure only uses the example of the impedance of the pole being approximated to the resistance of the pole for illustrative introduction.

[0027] refer to Figures 1 to 5As shown in , the present disclosure provides a battery cover assembly, which includes a cover body 1, a first lead-out piece 2, a second lead-out piece 5 and a plurality of poles, the first lead-out piece 2 is used to lead out the positive or negative pole of the battery, the second lead-out piece 5 is used to connect to the battery cell, the first lead-out piece 2 and the second lead-out piece 5 are respectively located on opposite sides of the cover body 1, the pole is passed through the cover body 1, and the plurality of poles are connected in parallel between the first lead-out piece 2 and the second lead-out piece 5, wherein the plurality of poles include a first pole 3 and a second pole 4, and the impedance of the second pole 4 is less than the impedance of the first pole 3.

[0028] The technical solution provided by the embodiments of the present disclosure may include the following beneficial effects: in the battery cover assembly provided by the present disclosure, a plurality of poles are provided, and the plurality of poles are connected in parallel between the first lead-out member 2 and the second lead-out member 5. Based on the fact that the total parallel resistance is less than any branch resistance in the circuit, compared with the implementation in the related art in which only the first pole 3 is provided between the first lead-out member 2 and the second lead-out member 5, the present application provides the second pole 4 in parallel with the first pole 3, and by making the impedance of the second pole 4 less than the impedance of the first pole 3, the resistance of the second pole 4 can be made less than the resistance of the first pole 3, thereby making the total resistance of the plurality of poles less than the resistance of the second pole 4, thereby effectively reducing the total resistance of the plurality of poles, thereby effectively reducing the heat generation of the plurality of poles when the battery is rapidly charged at a high rate, thereby reducing the temperature rise of the poles, avoiding excessive temperature of the poles, and helping to maintain good performance of the battery.

[0029] In the present disclosure, the cover body 1 can shield the second lead-out member 5 to prevent the second lead-out member 5 from leaking out, thereby ensuring the reliability of the connection among the second lead-out member 5, the battery cell and the pole.

[0030] The first lead-out member 2 may be a metal aluminum member, the first lead-out member 2 may be constructed as a block structure, and the second lead-out member 5 may be constructed as a sheet structure, which is not specifically limited in the present disclosure.

[0031] In some exemplary embodiments of the present disclosure, referring to Figures 2 to 5 As shown in FIG, the electrode has a first end 101 and a second end 401 arranged opposite each other in the axial direction. The first end 101 is connected to the first lead member 2, and the second end 401 is connected to the second lead member 5. Adjacent electrodes are spaced apart. This arrangement enables multiple electrodes to be connected in parallel between the first lead member 2 and the second lead member 5, thereby achieving the purpose of reducing the total resistance.

[0032] Among them, reference Figures 2 to 5 As shown in FIG, a through hole 21 is formed on the first lead-out member 2 , and the first end 101 is passed through the through hole 21 and riveted to the through hole 21 to connect the first end 101 to the first lead-out member 2 .

[0033] In some exemplary embodiments of the present disclosure, referring to Figures 2 to 4 As shown in , the battery cover assembly may further include a first insulating seat 6, which is disposed between the cover body 1 and the first lead-out piece 2 to provide insulation between the cover body 1 and the first lead-out piece 2. The first insulating seat 6 is provided with a first through-hole 61, and the pole is passed through the first through-hole 61. The first insulating seat 6 is provided for insulation between the cover body 1 and the first lead-out piece 2 to prevent electrical conduction between the cover body 1 and the first lead-out piece 2, thereby improving the safety of the battery cover assembly.

[0034] In some exemplary embodiments of the present disclosure, referring to Figures 2 to 4 As shown in , the battery cover assembly further includes a second insulating seat 7, which is located between the cover body 1 and the first lead-out member 2 to provide insulation between the cover body 1 and the first lead-out member 2. The second insulating seat 7 is provided with a second through-hole 71, and the pole is passed through the second through-hole 71. By providing the second insulating seat 7 for insulation between the cover body 1 and the second lead-out member 5, electrical conduction between the cover body 1 and the second lead-out member 5 is avoided, thereby improving the safety of the battery cover assembly.

[0035] In the present disclosure, a fourth through hole 51 is provided on the second lead-out member 5, and the second end 401 of the pole extends into the fourth through hole 51 and is connected to the second lead-out member 5. By extending the second end 401 into the fourth through hole 51, the contact area between the pole and the second lead-out member 5 is increased, which is beneficial to improving the current flow capacity of the battery cover assembly and reducing losses.

[0036] In some exemplary embodiments of the present disclosure, referring to Figures 2 to 4 As shown in , the battery cover assembly also includes an insulating sleeve 8. A third through-hole 11 is formed on the cover body 1, and the pole is passed through the third through-hole 11. The insulating sleeve 8 is disposed in the third through-hole 11 and is used to provide insulation between the cover body 1 and the pole. The insulating sleeve 8 is provided to seal the gap between the pole and the third through-hole 11 to ensure the sealing of the battery. In addition, the insulating sleeve 8 is used to insulate between the cover body 1 and the pole, preventing electrical connection between the cover body 1 and the pole, thereby ensuring safe use of the battery.

[0037] refer to Figure 2 and Figure 3 As shown in the figure, the first insulating seat 6 can be provided with a mounting groove 62 that opens in a direction away from the cover plate body 1, and the first lead-out member 2 is installed in the mounting groove 62. The bottom of the mounting groove 62 is provided with a first through-hole 61 relative to the plurality of third through-holes 11 for the corresponding poles to pass through; in this way, by providing the mounting groove 62, the first lead-out member 2 is positioned and installed.

[0038] The present disclosure may adopt various implementations to make the impedance of the second pole 4 smaller than the impedance of the first pole 3 , which will be described in detail in the following implementations.

[0039] In some exemplary embodiments of the present disclosure, the first electrode 3 may be made of a first preset material, and the second electrode 4 may be made of a second preset material. The impedance of the second preset material may be lower than the impedance of the first preset material, so that the impedance of the second electrode 4 is lower than the impedance of the first electrode 3. With this arrangement, the impedance of the second electrode 4 can be made lower than the impedance of the first electrode 3 by flexibly changing the specific materials of the first electrode 3 and the specific materials of the second electrode 4. Here, since the change in material has a significant impact on the impedance of the electrode, by making the impedance of the second preset material lower than the impedance of the first preset material, it can be relatively easy to achieve that the impedance of the second electrode 4 is lower than the impedance of the first electrode 3, thereby reducing the difficulty of manufacturing the battery cover assembly.

[0040] In other exemplary embodiments of the present disclosure, since the cross-sectional area of the pole is inversely proportional to the resistance of the pole, the present disclosure may also set the cross-sectional area of the second pole 4 to be larger than the cross-sectional area of the first pole 3, so that the impedance of the second pole 4 is lower than the impedance of the first pole 3. Of course, any implementation method that achieves that the impedance of the second pole 4 is lower than the impedance of the first pole 3 is acceptable.

[0041] In an exemplary embodiment of the present disclosure, in an embodiment where the impedance of the second predetermined material is lower than the impedance of the first predetermined material, the second predetermined material may include at least one of gold, copper, and silver. Because gold, copper, and silver have low resistivity and good conductivity, the resistance of the second electrode 4 made of gold, copper, or silver is low, thereby achieving a lower impedance of the second predetermined material.

[0042] In order to further reduce the resistance of the second pole 4, the second preset material may also include a near-superconducting material or other conductive material with an impedance smaller than that of the copper-aluminum composite material, which is not specifically limited in the present disclosure.

[0043] In an exemplary embodiment of the present disclosure, the first predetermined material may include a copper-aluminum composite material. Copper-aluminum composite materials offer excellent conductivity, are easy to process, and are cost-effective. Furthermore, aluminum is lighter than copper, making them lighter than all-copper materials, facilitating lightweighting. Furthermore, the impedance of copper-aluminum composite materials is lower than that of gold, copper, and silver, facilitating that the impedance of the second pole 4 is lower than that of the first pole 3.

[0044] In the exemplary embodiments of the present disclosure, reference is made to Figures 1 to 4As shown in , the cross-sectional area of the second electrode 4 can be smaller than that of the first electrode 3. Here, due to the limitation of the overall size of the battery cover assembly, the cross-sectional area of the second electrode 4 and the cross-sectional area of the first electrode 3 are both limited. When the overall structural shapes of the first electrode 3 and the second electrode 4 are the same, by making the cross-sectional area of the second electrode 4 smaller than that of the first electrode 3, the size of the second electrode 4 is reduced, which facilitates the processing of the second electrode 4, reduces the use of raw materials, and helps reduce costs.

[0045] In the present disclosure, the second pole 4 and the first pole 3 can be constructed in a cylindrical or non-cylindrical shape. It should be noted that for the second pole 4 and the first pole 3 constructed in a cylindrical shape, the cross-sectional area at each location is equal. For the second pole 4 and the first pole 3 constructed in a non-cylindrical shape, for example, for the second pole 4 and the first pole 3 in a stepped shaft shape, the cross-sectional area at each location is equal. Figure 5 As shown in , the second pole 4 and the first pole 3 both include a first shaft segment 10, a second shaft segment 20, a third shaft segment 30 and a fourth shaft segment 40. It can be understood that the cross-sectional area of the second pole 4 is smaller than the cross-sectional area of the first pole 3 for the same shaft segment of the second pole 4 and the first pole 3. For example, the cross-sectional area of the first shaft segment 10 of the second pole 4 needs to be smaller than the cross-sectional area of the first shaft segment 10 of the first pole 3, the cross-sectional area of the second shaft segment 20 of the second pole 4 needs to be smaller than the cross-sectional area of the second shaft segment 20 of the first pole 3, the cross-sectional area of the third shaft segment 30 of the second pole 4 needs to be smaller than the cross-sectional area of the third shaft segment 30 of the first pole 3, and the cross-sectional area of the fourth shaft segment 40 of the second pole 4 needs to be smaller than the cross-sectional area of the fourth shaft segment 40 of the first pole 3.

[0046] In the exemplary embodiments of the present disclosure, reference is made to Figures 1 to 3 As shown in , the ratio of the cross-sectional area of the second pole 4 to the cross-sectional area of the first pole 3 can be 0.4-0.6. Exemplarily, the ratio of the cross-sectional area of the second pole 4 to the cross-sectional area of the first pole 3 can be 0.4, 0.5 or 0.6. Thus, when the ratio of the cross-sectional area of the second pole 4 to the cross-sectional area of the first pole 3 is 0.4, the size of the second pole 4 is smaller, the space occupied is less, and the second pole 4 is convenient for arranging. Moreover, since the cost of the second preset material used for the second pole 4 is high, reducing the size of the second pole 4 is beneficial to reducing costs. When the ratio of the cross-sectional area of the second pole 4 to the cross-sectional area of the first pole 3 is 0.6, the size of the second pole 4 is larger, which facilitates the processing of the second pole 4. In addition, by controlling the cross-sectional areas of the second pole 4 and the first pole 3, not only the connection strength of the second pole 4 and the first pole 3 after riveting to the first lead-out member 2 is ensured, so that the battery cover assembly 100 as a whole has good mechanical properties, but also it is beneficial to ensure the flow area of the battery cover assembly 100, thereby helping to reduce the temperature rise of the pole and the battery cover assembly 100 as a whole.

[0047] In the exemplary embodiments of the present disclosure, reference is made to Figures 1 to 4 As shown in , the plurality of poles may include at least two first poles 3 and at least one second pole 4, and the second pole 4 is arranged between two adjacent first poles 3. In order to ensure the conductive performance of the poles, the cross-sectional area of the poles is generally large, thereby reducing the resistance. When the cover body is long, the cross-sectional area of the poles is limited and cannot be too large, which will affect the conductive ability of the battery cover assembly. The overcurrent capacity can be increased by increasing the number of poles, that is, increasing the number of first poles 3 and / or the number of second poles 4. The number of first poles 3 can be set to two or more, and the number of second poles 4 can be set to one, two or more, which can be flexibly set according to the specific use scenario, and the present disclosure does not impose specific restrictions on this.

[0048] In some embodiments, reference Figures 1 to 4 As shown in , the plurality of poles may include two first poles 3 and one second pole 4, and the second pole 4 is disposed between two adjacent first poles 3. Here, since the second pole 4 is disposed in the space between the two first poles 3, the rational arrangement of the plurality of poles is facilitated. Specifically, since the cross-sectional area of the second pole 4 is smaller than the cross-sectional area of the first pole 3, the volume of the second pole 4 is small. By disposing the second pole 4 between two adjacent first poles 3, it is convenient to arrange the second pole 4 on the existing battery cover assembly, thereby achieving the purpose of reducing the total resistance of the poles. This is conducive to saving processing steps and improving processing convenience. In addition, it is convenient to selectively arrange the second pole 4 or selectively arrange different numbers of second poles 4 according to actual use requirements.

[0049] Of course, the second pole 4 can also be arranged on the side opposite to the two adjacent first poles 3, and can be flexibly arranged according to the space on the first lead-out member 2. As long as the second pole 4 and the first pole 3 can be connected in parallel between the first lead-out member 2 and the second lead-out member 5, the overcurrent of the battery cover assembly can be realized and the total resistance of the pole can be reduced, the present disclosure does not impose any specific restrictions on this.

[0050] Reference Figure 6 and Figure 7 As shown in the figure, under the experimental conditions of a current of 300A and a temperature of 25°C, when the second pole 4 is made of different materials, the reduction ratio of the total impedance of multiple poles is shown. Among them, when the material used by the second pole 4 is a copper-aluminum composite pole, since the first pole 3 is a copper-aluminum composite pole, at this time, the total number of poles is increased. Since multiple poles are connected in parallel, the total resistance of the multiple poles is reduced, that is, the total impedance of the multiple poles is reduced.

[0051] Reference Figure 6As shown in the figure, when the first pole 3 adopts a copper-aluminum composite pole, the total impedance reduction ratio of the plurality of poles is 20%, and the temperature drop of the plurality of poles is 0.8°C; when the second pole 4 adopts the second preset material of gold, the total impedance reduction ratio of the plurality of poles is 21%, and the temperature drop of the plurality of poles is 0.9°C; when the second pole 4 adopts the second preset material of copper, the total impedance reduction ratio of the plurality of poles is 28%, and the temperature drop of the plurality of poles is 1.2°C; when the second pole 4 adopts the second preset material of aluminum, the total impedance reduction ratio of the plurality of poles is 21%, and the temperature drop of the plurality of poles is 0.9°C; when the second pole 4 adopts the second preset material of copper, the total impedance reduction ratio of the plurality of poles is 28%, and the temperature drop of the plurality of poles is 1.2°C; When the material is silver, the total impedance reduction ratio of the plurality of poles is 30%, and the temperature drop of the plurality of poles is 1.3°C. It can be seen that when the second preset material used by the second pole 4 is the copper-aluminum composite pole, gold, copper, and silver, the total impedance reduction ratio of the plurality of poles increases in sequence, and the temperature drop of the plurality of poles increases in sequence. Since the resistance of the copper-aluminum composite pole is greater than the resistance of the gold pole, the resistance of the gold pole is greater than the resistance of the copper pole, and the resistance of the copper pole is greater than the resistance of the silver pole, Figure 6 and Figure 7 It can be concluded that the smaller the resistance value of the second pole 4, the greater the reduction ratio of the total impedance of multiple poles. That is, the smaller the total impedance of the poles, the more conducive it is to improving the overcurrent capacity of the battery cover assembly 100 and reducing the heat generation and temperature rise of multiple poles.

[0052] Reference Figure 8 As shown in the figure, it shows the temperature drop of multiple poles when the second pole 4 is made of different materials under the experimental condition of 300A current. According to the parallel resistance formula , total resistance of multiple poles is smaller than the minimum resistance in the parallel resistor, that is, smaller than the resistance of the second pole 4. Therefore, by reducing the resistance of the second pole 4, the total resistance of the multiple poles on the battery cover assembly 100 can be made close to infinitesimal. From the Rt heat generation formula, it can be seen that when the total resistance of the multiple poles on the battery cover assembly 100 decreases, the multiple poles on the battery cover assembly 100 are less likely to generate heat and less likely to cause their own temperature rise, thereby avoiding affecting the performance of the battery due to excessive temperature of the multiple poles.

[0053] According to a second aspect of the present disclosure, a battery is provided, comprising the battery cover assembly 100 as described above. The battery has all the beneficial effects of the battery cover assembly as described above, which will not be described in detail in this disclosure.

[0054] According to a third aspect of the present disclosure, a battery pack is provided, comprising the battery described above. The battery pack has all the beneficial effects of the battery described above, which will not be described in detail herein.

[0055] According to a fourth aspect of the present disclosure, an electrical device is provided, comprising the battery pack described above. The electrical device has all the benefits of the battery pack described above, which are not further described herein. In some embodiments, the electrical device may be a vehicle, which is not otherwise limited by the present disclosure.

[0056] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings. However, the present disclosure is not limited to the specific details of the above embodiments. Within the technical concept of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure, and these simple modifications all fall within the scope of protection of the present disclosure.

[0057] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any appropriate manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0058] In addition, the various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A battery cover assembly, characterized in that: It includes a cover body, a first lead-out piece, a second lead-out piece and multiple poles, the first lead-out piece is used to lead out the positive or negative pole of the battery, the second lead-out piece is used to connect to the battery cell, the first lead-out piece and the second lead-out piece are respectively located on opposite sides of the cover body, the pole is passed through the cover body, and multiple poles are connected in parallel between the first lead-out piece and the second lead-out piece, wherein the multiple poles include a first pole and a second pole, and the impedance of the second pole is less than the impedance of the first pole.

2. The battery cover assembly according to claim 1, characterized in that: The first pole is made of a first preset material, and the second pole is made of a second preset material. The impedance of the second preset material is smaller than the impedance of the first preset material, so that the impedance of the second pole is smaller than the impedance of the first pole.

3. The battery cover assembly according to claim 2, characterized in that: The second preset material includes at least one of gold, copper, and silver.

4. The battery cover assembly according to claim 3, characterized in that: The first preset material includes a copper-aluminum composite material.

5. The battery cover assembly according to any one of claims 1 to 4, characterized in that: The cross-sectional area of the second pole is smaller than the cross-sectional area of the first pole.

6. The battery cover assembly according to claim 5, characterized in that: The ratio of the cross-sectional area of the second pole to the cross-sectional area of the first pole is 0.4-0.

6.

7. The battery cover assembly according to claim 6, characterized in that: The ratio of the cross-sectional area of the second pole to the cross-sectional area of the first pole is 0.

5.

8. The battery cover assembly according to claim 5, characterized in that: The plurality of poles include at least two first poles and at least one second pole, and the second pole is arranged between two adjacent first poles.

9. The battery cover assembly according to claim 1, characterized in that: The pole has a first end and a second end that are oppositely arranged in the axial direction, the first end is connected to the first lead-out piece, the second end is connected to the second lead-out piece, and two adjacent poles are spaced apart.

10. The battery cover assembly according to claim 1, characterized in that: The battery cover assembly also includes a first insulating seat, which is arranged between the cover body and the first lead-out piece to provide insulation between the cover body and the first lead-out piece. The first insulating seat is provided with a first through hole, and the pole is passed through the first through hole.

11. The battery cover assembly according to claim 1, characterized in that: The battery cover assembly also includes a second insulating seat, which is located between the cover body and the first lead-out piece to provide insulation between the cover body and the first lead-out piece. The second insulating seat is provided with a second through hole, and the pole is passed through the second through hole.

12. The battery cover assembly according to claim 1, characterized in that: The battery cover assembly also includes an insulating sleeve. A third through hole is opened on the cover body, the pole is passed through the third through hole, and the insulating sleeve is arranged in the third through hole and is used to provide insulation between the cover body and the pole.

13. A battery, characterized in that: A battery cover assembly comprising any one of claims 1-12.

14. A battery pack, characterized in that: Including the battery according to claim 13.

15. An electrical device, characterized in that: Including the battery pack according to claim 14.

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