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

Abstract

The present disclosure relates to a battery cover plate assembly, a battery, a battery pack and an electric device. The battery cover plate assembly comprises a cover plate body, a first lead-out piece, a second lead-out piece and a plurality of pole columns. The first lead-out piece is used to lead out the positive electrode or the negative electrode of the battery. The second lead-out piece is used to connect with the battery cell. The first lead-out piece and the second lead-out piece are respectively located on the opposite sides of the cover plate body. The pole columns are arranged in the cover plate body. The plurality of pole columns are connected in parallel between the first lead-out piece and the second lead-out piece. The plurality of pole columns comprise a first pole column and a second pole column. The impedance of the second pole column is smaller than the impedance of the first pole column. The battery cover plate assembly provided by the present disclosure can reduce the temperature rise of the pole column, avoid the temperature of the pole column being too high, and is beneficial to keeping the battery in good performance.

Description

Technical Field

[0001] This disclosure relates to the field of battery technology, specifically to a battery cover assembly, a battery, a battery pack, and an electrical device. Background Technology

[0002] Currently, battery cover assemblies typically have lead-out components on their cover plates. These lead-out components are usually electrically connected to the lead-out components on the battery cell via terminals, thereby outputting the electrical energy from the battery cell to the outside. In related technologies, when the battery is working, such as when the battery is being charged at a high rate, the terminals are prone to generating heat, causing their own temperature to rise, or even leading to excessively high terminal temperatures, which affects the battery's performance. Summary of the Invention

[0003] The purpose of this disclosure is to provide a battery cover assembly that can reduce the temperature rise of the terminals, prevent the terminals from becoming too hot, and help maintain good battery performance.

[0004] To achieve the above objectives, according to a first aspect of this disclosure, a battery cover assembly is provided, comprising a cover body, a first lead-out member, a second lead-out member, and a plurality of terminals. The first lead-out member is used to lead out the positive or negative terminal of the battery, and the second lead-out member is used to connect to the battery cell. The first lead-out member and the second lead-out member are respectively located on opposite sides of the cover body. The terminals pass through the cover body, and the plurality of terminals are connected in parallel between the first lead-out member and the second lead-out member. The plurality of terminals includes a first terminal and a second terminal, and the impedance of the second terminal is less than the impedance of the first terminal.

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

[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, the cross-sectional area of ​​the second pole post is smaller than that of the first pole post.

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

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

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

[0012] Optionally, the pole has a first end and a second end that are arranged opposite to each other in the axial direction. The first end is connected to the first lead-out member, and the second end is connected to the second lead-out member. Adjacent poles are spaced apart.

[0013] Optionally, the battery cover assembly further includes a first insulating seat, which is disposed between the cover body and the first lead-out member to provide insulation between the cover body and the first lead-out member. The first insulating seat has a first through hole, through which the electrode post passes.

[0014] Optionally, the battery cover assembly further includes a second insulating seat located between the cover body and the first lead-out member to provide insulation between the cover body and the first lead-out member. The second insulating seat is provided with a second through hole, through which the electrode post passes.

[0015] Optionally, the battery cover assembly further includes an insulating sleeve, a third through hole is provided on the cover body, the electrode post passes through the third through hole, the insulating sleeve is disposed in the third through hole, and is used to provide insulation between the cover body and the electrode post.

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

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

[0018] According to a fourth aspect of this disclosure, an electrical appliance is provided, including the battery pack described above.

[0019] The technical solutions provided by the embodiments of this disclosure can include the following beneficial effects: In the battery cover assembly provided by this disclosure, multiple terminals are provided, and the multiple terminals are connected in parallel between the first lead and the second lead. Based on the fact that the total parallel resistance is less than any individual resistance in the circuit, compared with the related art where only the first terminal is provided between the first lead and the second lead, this application provides a second terminal connected in parallel with the first terminal. By making the impedance of the second terminal less than the impedance of the first terminal, the resistance of the second terminal can be made less than the resistance of the first terminal. Thus, the total resistance of the multiple terminals can be made less than the resistance of the second terminal, thereby effectively reducing the total resistance of the multiple terminals. This effectively reduces the heat generated by the multiple terminals when the battery is charged at a high rate, thereby reducing the temperature rise of the terminals and avoiding excessively high terminal temperatures, which is beneficial for maintaining good battery performance.

[0020] Other features and advantages of this disclosure will be described in detail in the following detailed description section. Attached Figure Description

[0021] The accompanying drawings are provided to further illustrate the present disclosure and form part of the specification. They are used together with the following detailed description to explain the present disclosure, but do not constitute a limitation thereof. In the drawings:

[0022] Figure 1 This is a schematic diagram of the structure of the battery cover assembly provided in the embodiments of this disclosure;

[0023] Figure 2 This is a cross-sectional view of the battery cover assembly provided in an embodiment of this disclosure;

[0024] Figure 3 yes Figure 2 A magnified view of a section at point A in the middle;

[0025] Figure 4 This is an exploded view of the battery cover assembly provided in the embodiments of this disclosure;

[0026] Figure 5 This is a schematic diagram of the terminal post structure of the battery cover assembly provided in this embodiment;

[0027] Figure 6 This is an experimental diagram showing the relationship between the material of the second terminal of the battery cover assembly provided in this embodiment and the reduction ratio of the total impedance of multiple terminals and the temperature drop of multiple terminals.

[0028] Figure 7 This is an experimental diagram showing the relationship between the material of the second terminal of the battery cover assembly provided in this embodiment and the reduction ratio of the total impedance of multiple terminals;

[0029] Figure 8This is an experimental diagram showing the relationship between the material of the second electrode post and the temperature drop of multiple electrode posts in the battery cover assembly provided in this embodiment.

[0030] Explanation of reference numerals in the attached figures

[0031] 1-Cover plate body; 11-Third through hole; 2-First lead-out component; 21-Through hole; 3-First terminal post; 4-Second terminal post; 5-Second lead-out component; 51-Fourth through hole; 6-First insulating seat; 61-First through hole; 62-Mounting groove; 7-Second insulating seat; 71-Second through hole; 8-Insulating sleeve; 10-First shaft segment; 101-First end; 20-Second shaft segment; 30-Third shaft segment; 40-Fourth shaft segment; 401-Second end; 100-Battery cover plate assembly. Detailed Implementation

[0032] The specific embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this disclosure.

[0033] In this disclosure, unless otherwise stated, the terms "first," "second," etc., are used to distinguish one element from another and do not have sequential or material significance. Furthermore, in the following description, when referring to the accompanying drawings, unless otherwise explained, the same reference numerals in different drawings denote the same or similar elements. The above definitions are for explanation and illustration only and should not be construed as limiting this disclosure.

[0034] It should be noted that in a circuit with resistance, inductance, and capacitance, the opposition to the current in the circuit is called impedance. Impedance is a complex number, with the real part called resistance and the imaginary part called reactance. Among them, the opposition to alternating current in a circuit caused by a capacitor is called capacitive reactance, and the opposition to alternating current in a circuit caused by an inductor is called inductive reactance. The opposition to alternating current caused by both capacitors and inductors in a circuit is called reactance. However, in a DC circuit, resistance and impedance are equivalent because there is no reactance component (inductive and capacitive reactance) in a DC circuit, so impedance is equal to resistance.

[0035] In this disclosure, since the battery generates direct current, the impedance of the terminal can be approximated as the resistance of the terminal, and the total parallel impedance of the terminals is approximated as the total parallel resistance of the terminals. Based on the above, this disclosure only uses the example of the impedance of the terminals being approximated as the resistance of the terminals for illustrative purposes.

[0036] refer to Figures 1 to 5As shown in the figure, this disclosure provides a battery cover assembly, which includes a cover body 1, a first lead-out member 2, a second lead-out member 5, and a plurality of terminals. The first lead-out member 2 is used to lead out the positive or negative terminal of the battery, and the second lead-out member 5 is used to connect with the battery cell. The first lead-out member 2 and the second lead-out member 5 are respectively located on opposite sides of the cover body 1. The terminals pass through the cover body 1, and the plurality of terminals are connected in parallel between the first lead-out member 2 and the second lead-out member 5. The plurality of terminals include a first terminal 3 and a second terminal 4, and the impedance of the second terminal 4 is less than the impedance of the first terminal 3.

[0037] The technical solutions provided by the embodiments of this disclosure can include the following beneficial effects: In the battery cover assembly provided by this disclosure, multiple terminals are provided, and the multiple terminals are connected in parallel between the first lead 2 and the second lead 5. Based on the fact that the total parallel resistance is less than any individual resistance in the circuit, compared with the related art where only the first terminal 3 is provided between the first lead 2 and the second lead 5, this application provides a second terminal 4 connected in parallel with the first terminal 3. By making the impedance of the second terminal 4 less than the impedance of the first terminal 3, the resistance of the second terminal 4 can be made less than the resistance of the first terminal 3. Thus, the total resistance of the multiple terminals can be made less than the resistance of the second terminal 4. This can effectively reduce the total resistance of the multiple terminals, thereby effectively reducing the heat generated by the multiple terminals when the battery is charged at a high rate, thereby reducing the temperature rise of the terminals, avoiding excessively high terminal temperatures, and helping to maintain good battery performance.

[0038] In this disclosure, the cover plate body 1 can cover the second lead 5 to prevent the second lead 5 from being exposed, and ensure the reliability of the connection between the second lead 5, the battery cell and the terminal post.

[0039] The first lead-out part 2 can be a metal aluminum part, and the first lead-out part 2 can be constructed as a block structure. The second lead-out part 5 can be constructed as a sheet structure. This disclosure does not make specific limitations in this regard.

[0040] In some exemplary embodiments of this disclosure, reference is made to Figures 2 to 5 As shown, 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 2, and the second end 401 is connected to the second lead 5. Adjacent electrodes are spaced apart. Through the above arrangement, multiple electrodes are connected in parallel between the first lead 2 and the second lead 5 to reduce the total resistance.

[0041] Among them, reference Figures 2 to 5 As shown, the first lead-out member 2 has a through hole 21, and the first end 101 passes through the through hole 21 and is riveted to the through hole 21 to connect the first end 101 to the first lead-out member 2.

[0042] In some exemplary embodiments of this disclosure, reference is made to Figures 2 to 4 As shown, 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 member 2 to provide insulation between them. The first insulating seat 6 has a first through hole 61 through which the terminal post passes. The first insulating seat 6 provides insulation between the cover body 1 and the first lead-out member 2, preventing electrical continuity between them and improving the safety of the battery cover assembly.

[0043] In some exemplary embodiments of this disclosure, reference is made to Figures 2 to 4 As shown, the battery cover assembly also 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 them. The second insulating seat 7 has a second through hole 71 through which the terminal post passes. By providing the second insulating seat 7, insulation is achieved between the cover body 1 and the second lead-out member 5, preventing electrical continuity between them and improving the safety of the battery cover assembly.

[0044] In this disclosure, the second lead-out member 5 is provided with a fourth through hole 51, and the second end 401 of the electrode post 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 electrode post and the second lead-out member 5 is increased, which is beneficial to improving the current carrying capacity of the battery cover assembly and reducing losses.

[0045] In some exemplary embodiments of this disclosure, reference is made to Figures 2 to 4 As shown, the battery cover assembly also includes an insulating sleeve 8. A third through-hole 11 is provided on the cover body 1, through which the terminal post passes. The insulating sleeve 8 is disposed in the third through-hole 11 and provides insulation between the cover body 1 and the terminal post. By providing the insulating sleeve 8, the gap between the terminal post and the third through-hole 11 is sealed to ensure the battery's airtightness. Furthermore, the insulating sleeve 8 also serves to insulate between the cover body 1 and the terminal post, preventing electrical connection between them and ensuring the battery's safe operation.

[0046] refer to Figure 2 and Figure 3 As shown, the first insulating base 6 may be provided with a mounting groove 62 that opens in the direction away from the cover plate body 1. 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, so that the corresponding pole post can pass through. In this way, the first lead-out member 2 is positioned and installed by setting the mounting groove 62.

[0047] This disclosure allows for various implementation methods to make the impedance of the second pole 4 less than the impedance of the first pole 3, which will be described in detail in the following embodiments.

[0048] In some exemplary embodiments of this disclosure, the first electrode post 3 may be made of a first preset material, and the second electrode post 4 may be made of a second preset material. The impedance of the second preset material may be less than the impedance of the first preset material, so that the impedance of the second electrode post 4 is less than the impedance of the first electrode post 3. This configuration allows for flexible changes in the specific materials of the first electrode post 3 and the second electrode post 4 to make the impedance of the second electrode post 4 less than the impedance of the first electrode post 3. Since changes in materials have a significant impact on the impedance of the electrode post, making the impedance of the second preset material less than the impedance of the first preset material makes it relatively easy to achieve the same result, thereby reducing the manufacturing difficulty of the battery cover assembly.

[0049] In some other exemplary embodiments of this disclosure, since the cross-sectional area of ​​the electrode post is inversely proportional to the resistance of the electrode post, the cross-sectional area of ​​the second electrode post 4 can also be set to be larger than the cross-sectional area of ​​the first electrode post 3, so that the impedance of the second electrode post 4 is less than the impedance of the first electrode post 3. Of course, any implementation method that achieves the impedance of the second electrode post 4 being less than the impedance of the first electrode post 3 is acceptable.

[0050] In an exemplary embodiment of this disclosure, where the impedance of the second preset material is less than that of the first preset material, the second preset material may include at least one of gold, copper, and silver. Since gold, copper, and silver materials have low resistivity and good conductivity, the resistance of the second electrode 4 made of gold, copper, or silver materials is low, thereby achieving a lower impedance for the second preset material.

[0051] To further reduce the resistance of the second pole 4, the second preset material may also include near-superconducting materials or other conductive materials with impedances lower than those of copper-aluminum composite materials, without specific limitations in this disclosure.

[0052] In exemplary embodiments of this disclosure, the first preset material may include a copper-aluminum composite material. Copper-aluminum composite materials have good electrical conductivity, are easy to process, and are cost-effective. Furthermore, aluminum is lighter than copper, therefore the copper-aluminum composite material is lighter than pure copper, which is beneficial for weight reduction. In addition, the impedance of the copper-aluminum composite material is lower than that of gold, copper, and silver, which facilitates achieving a lower impedance for the second electrode post 4 than for the first electrode post 3.

[0053] In exemplary embodiments of this disclosure, reference is made to Figures 1 to 4As shown, the cross-sectional area of ​​the second electrode post 4 can be smaller than that of the first electrode post 3. Here, due to the overall size limitation of the battery cover assembly, the cross-sectional areas of both the second electrode post 4 and the first electrode post 3 are limited. When the overall structural shapes of the first electrode post 3 and the second electrode post 4 are the same, by making the cross-sectional area of ​​the second electrode post 4 smaller than that of the first electrode post 3, the size of the second electrode post 4 is made smaller, which facilitates the processing of the second electrode post 4, reduces the use of raw materials, and helps to reduce costs.

[0054] In this disclosure, the second pole post 4 and the first pole post 3 can be constructed as cylindrical or non-cylindrical. It should be noted that for the cylindrical second pole post 4 and the first pole post 3, the cross-sectional area is equal at all points. For the non-cylindrical second pole post 4 and the first pole post 3, such as the stepped shaft-shaped second pole post 4 and the first pole post 3, refer to... Figure 5 As shown, both the second pole post 4 and the first pole post 3 include a first shaft segment 10, a second shaft segment 20, a third shaft segment 30, and a fourth shaft segment 40. Understandably, the fact that the cross-sectional area of ​​the second pole post 4 is smaller than that of the first pole post 3 refers to the same shaft segments of the second pole post 4 and the first pole post 3. For example, the cross-sectional area of ​​the first shaft segment 10 of the second pole post 4 must be smaller than that of the first shaft segment 10 of the first pole post 3, the cross-sectional area of ​​the second shaft segment 20 of the second pole post 4 must be smaller than that of the second shaft segment 20 of the first pole post 3, the cross-sectional area of ​​the third shaft segment 30 of the second pole post 4 must be smaller than that of the third shaft segment 30 of the first pole post 3, and the cross-sectional area of ​​the fourth shaft segment 40 of the second pole post 4 must be smaller than that of the fourth shaft segment 40 of the first pole post 3.

[0055] In exemplary embodiments of this disclosure, reference is made to Figures 1 to 3 As shown, the ratio of the cross-sectional area of ​​the second pole post 4 to the cross-sectional area of ​​the first pole post 3 can be 0.4 to 0.6. For example, the ratio of the cross-sectional area of ​​the second terminal post 4 to the cross-sectional area of ​​the first terminal post 3 can be 0.4, 0.5, or 0.6. Thus, when the ratio of the cross-sectional area of ​​the second terminal post 4 to the cross-sectional area of ​​the first terminal post 3 is 0.4, the size of the second terminal post 4 is smaller, occupies less space, and is easier to arrange. Moreover, since the second preset material used in the second terminal post 4 is expensive, reducing the size of the second terminal post 4 helps to reduce costs. When the ratio of the cross-sectional area of ​​the second terminal post 4 to the cross-sectional area of ​​the first terminal post 3 is 0.6, the size of the second terminal post 4 is larger, which facilitates the processing of the second terminal post 4. In addition, by controlling the cross-sectional areas of the second terminal post 4 and the first terminal post 3, not only is the connection strength of the second terminal post 4 and the first terminal post 3 after riveting with the first lead 2 guaranteed, so that the battery cover assembly 100 as a whole has good mechanical properties, but it also helps to ensure the flow area of ​​the battery cover assembly 100, thereby helping to reduce the temperature rise of the terminal post and the battery cover assembly 100 as a whole.

[0056] In exemplary embodiments of this disclosure, reference is made to Figures 1 to 4 As shown, the plurality of terminals may include at least two first terminals 3 and at least one second terminal 4, with the second terminal 4 disposed between two adjacent first terminals 3. To ensure the conductivity of the terminals, the cross-sectional area of ​​the terminals is generally large, thereby reducing resistance. When the cover plate body is elongated, the cross-sectional area of ​​the terminals is limited and cannot be too large, which will affect the conductivity of the battery cover plate assembly. The overcurrent capacity can be increased by increasing the number of terminals, i.e., increasing the number of first terminals 3 and / or the number of second terminals 4. The number of first terminals 3 can be set to two or more, and the number of second terminals 4 can be set to one, two, or more, flexibly set according to the specific application. This disclosure does not impose specific limitations in this regard.

[0057] In some embodiments, reference Figures 1 to 4 As shown, multiple terminals may include two first terminals 3 and one second terminal 4. The second terminal 4 is positioned between two adjacent first terminals 3. Here, utilizing the space between the two first terminals 3 to arrange the second terminal 4 facilitates the rational arrangement of multiple terminals. Specifically, since the cross-sectional area of ​​the second terminal 4 is smaller than that of the first terminal 3, the volume of the second terminal 4 is small. By positioning the second terminal 4 between two adjacent first terminals 3, it is convenient to arrange the second terminal 4 on the existing battery cover assembly, thereby reducing the total resistance of the terminals. This helps to save processing steps and improves processing convenience. In addition, it is convenient to selectively arrange the second terminal 4 or selectively arrange different numbers of second terminal 4 according to actual usage requirements.

[0058] Of course, the second terminal 4 can also be set on the side opposite to the two adjacent first terminals 3. Specifically, it can be flexibly arranged according to the space on the first lead 2. As long as the second terminal 4 and the first terminal 3 can be connected in parallel between the first lead 2 and the second lead 5 to realize the overcurrent of the battery cover assembly and achieve the purpose of reducing the total resistance of the terminals, this disclosure does not impose specific restrictions on this.

[0059] Reference Figure 6 and Figure 7 The figure shows the reduction ratio of the total impedance of multiple terminals when the second terminal 4 is made of different materials under experimental conditions of 300A current and 25℃. When the second terminal 4 is made of copper-aluminum composite terminal, since the first terminal 3 is also made of copper-aluminum composite terminal, it is equivalent to increasing the total number of terminals. Since multiple terminals are connected in parallel, the total resistance of multiple terminals is reduced, which means the total impedance of multiple terminals is reduced.

[0060] Reference Figure 6As shown, when the first electrode 3 is a copper-aluminum composite electrode, the total impedance reduction ratio of the multiple electrodes is 20%, and the temperature drop of the multiple electrodes is 0.8℃; when the second electrode 4 uses gold as the second preset material, the total impedance reduction ratio of the multiple electrodes is 21%, and the temperature drop of the multiple electrodes is 0.9℃; when the second electrode 4 uses copper as the second preset material, the total impedance reduction ratio of the multiple electrodes is 28%, and the temperature drop of the multiple electrodes is 1.2℃; when the second electrode 4 uses copper as the second preset material... When the material is silver, the total impedance reduction ratio of the multiple terminals is 30%, and the temperature drop of the multiple terminals is 1.3℃. Therefore, it can be seen that when the second terminal 4 uses the second preset material of copper-aluminum composite terminal, gold, copper, and silver, the total impedance reduction ratio of the multiple terminals increases sequentially, and the temperature drop of the multiple terminals also increases sequentially. Since the resistance of the copper-aluminum composite terminal is greater than that of the gold terminal, the resistance of the gold terminal is greater than that of the copper terminal, and the resistance of the copper terminal is greater than that of the silver terminal, therefore... Figure 6 and Figure 7 It can be concluded that the smaller the resistance value of the second terminal 4, the greater the reduction in the total impedance of multiple terminals. That is, the smaller the total impedance of the terminals, the more beneficial it is to improve the current carrying capacity of the battery cover assembly 100, and reduce the heat generation and temperature rise of multiple terminals.

[0061] Reference Figure 8 The figure shows the temperature drop of multiple electrodes when the second electrode 4 is made of different materials under experimental conditions of 300A. This is based on the parallel resistance formula. Total resistance of multiple terminals The resistance is less than the smallest resistance in the parallel resistors, that is, less than the resistance of the second terminal 4. Therefore, by reducing the resistance of the second terminal 4, the total resistance of the multiple terminals on the battery cover assembly 100 can be made close to infinitesimal. According to the Rt heat generation formula, when the total resistance of multiple terminals on the battery cover assembly 100 decreases, the multiple terminals on the battery cover assembly 100 are less likely to generate heat and cause their own temperature rise, thus avoiding the impact on battery performance due to excessively high temperatures of multiple terminals.

[0062] According to a second aspect of this disclosure, a battery is provided, including the battery cover assembly 100 as described above. This battery has all the beneficial effects of the battery cover assembly described above, which will not be elaborated upon herein.

[0063] According to a third aspect of this disclosure, a battery pack is provided, comprising the battery as described above. This battery pack possesses all the beneficial effects of the described battery, which will not be elaborated upon herein.

[0064] According to a fourth aspect of this disclosure, an electrical device is provided, including the battery pack described above. This electrical device possesses all the beneficial effects of the battery pack described above, which will not be elaborated upon herein. In some embodiments, the electrical device may be a vehicle, and this disclosure does not impose excessive limitations thereon.

[0065] The preferred embodiments of this disclosure have been described in detail above with reference to the accompanying drawings. However, this disclosure is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this disclosure, various simple modifications can be made to the technical solutions of this disclosure, and these simple modifications all fall within the protection scope of this disclosure.

[0066] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, this disclosure will not describe the various possible combinations separately.

[0067] Furthermore, various different embodiments of this disclosure can be combined in any way, as long as they do not violate the spirit of this disclosure, they should also be regarded as the content disclosed in this disclosure.

Claims

1. A battery cover assembly, characterized in that, The device includes a cover plate body, a first lead-out member, a second lead-out member, and multiple terminals. The first lead-out member is used to lead out the positive or negative terminal of the battery, and the second lead-out member is used to connect to the battery cell. The first lead-out member and the second lead-out member are located on opposite sides of the cover plate body. The terminals pass through the cover plate body, and multiple terminals are connected in parallel between the first lead-out member and the second lead-out member. The multiple terminals include a first terminal and a second terminal. The impedance of the second terminal is less than the impedance of the first terminal. The cross-sectional area of ​​the second terminal is less than the cross-sectional area of ​​the first terminal.

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

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 claim 1, characterized in that, The ratio of the cross-sectional area of ​​the second pole post to the cross-sectional area of ​​the first pole post is 0.4 to 0.

6.

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

5.

7. The battery cover assembly according to claim 1, characterized in that, The plurality of poles includes at least two first poles and at least one second pole, wherein the second pole is disposed between two adjacent first poles.

8. The battery cover assembly according to claim 1, characterized in that, The pole has a first end and a second end that are arranged opposite each other in the axial direction. The first end is connected to the first lead-out member, and the second end is connected to the second lead-out member. Adjacent poles are spaced apart.

9. The battery cover assembly according to claim 1, characterized in that, The battery cover assembly further includes a first insulating seat, which is disposed between the cover body and the first lead-out member to provide insulation between the cover body and the first lead-out member. The first insulating seat is provided with a first through hole, through which the electrode post passes.

10. The battery cover assembly according to claim 1, characterized in that, The battery cover assembly further includes a second insulating seat located between the cover body and the first lead-out member to provide insulation between the cover body and the first lead-out member. The second insulating seat has a second through hole through which the electrode post passes.

11. 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 provided on the cover body, the electrode post passes through the third through hole, and the insulating sleeve is disposed in the third through hole and is used to provide insulation between the cover body and the electrode post.

12. A battery, characterized in that, Includes the battery cover assembly as described in any one of claims 1-11.

13. A battery pack, characterized in that, Includes the battery as described in claim 12.

14. An electrical appliance, characterized in that, Includes the battery pack as described in claim 13.

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