Battery cell and electric device

Abstract

The utility model discloses a kind of battery unit and electric equipment, and battery unit includes battery shell and electrode assembly.Electrode assembly includes insulating component and metal conductor.Electricity shell is equipped with through-hole.Insulating component includes first insulating piece and second insulating piece.First insulating piece is connected to battery shell inner side, and second insulating piece is connected to battery shell outer side.Metal conductor is worn through hole, and part of metal conductor extends to battery shell inner side and is connected first insulating piece, and another part extends to battery shell outer side and is connected second insulating piece.Metal conductor of the scheme can be directly led out from battery shell to battery shell outside, can effectively reduce pole column internal resistance, improve battery performance.And, the scheme can omit rivet and its riveting process, effectively simplify processing technology, save material cost.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery cell and electrical equipment. Background Technology

[0002] Existing batteries consist of a battery casing and an electrode assembly. The electrode assembly includes an external insulator, an internal insulator, an internal metal conductor, and rivets. The rivets sequentially pass through the external insulator, battery casing, internal insulator, and internal metal conductor, achieving electrical connection and terminal sealing between the internal metal conductor and the external rivets through riveting. However, the contact resistance between the internal metal conductor and the rivets increases the internal resistance of the battery cell, affecting its performance. Utility Model Content

[0003] The main purpose of this utility model is to propose a battery cell and electrical equipment, which aims to solve the technical problem of increased internal resistance of the battery cell.

[0004] To achieve the above objectives, a first aspect of this utility model provides a battery cell, the battery cell comprising:

[0005] The battery casing has through holes;

[0006] An electrode assembly includes an insulating component and a metal conductor. The insulating component includes a first insulating member and a second insulating member. The first insulating member is connected to the inner side of the battery casing, and the second insulating member is connected to the outer side of the battery casing. The metal conductor passes through the through hole.

[0007] A portion of the metal conductor extends to the inside of the battery casing and is connected to the first insulating member, while another portion extends to the outside of the battery casing and is connected to the second insulating member.

[0008] In some embodiments, the metal conductor includes a first portion extending into the inside of the battery case and connected to the first insulating member, wherein at least a portion of the first portion is bent relative to the battery case to be stacked with the first insulating member.

[0009] In some embodiments, the metal conductor includes a second portion connected to the first portion, the second portion extending to the outside of the battery case and connected to the second insulating member, the second portion being at least partially bent relative to the battery case to be stacked with the second insulating member.

[0010] In some embodiments, the first insulating member has a first groove on the side opposite to the second insulating member, and the first portion is at least partially accommodated in the first groove; and / or,

[0011] The second insulating member has a second groove on the side opposite to the first insulating member, and the second part is at least partially accommodated in the second groove.

[0012] In some embodiments, the electrode assembly includes a sealing member disposed within the through hole and connected to the inner peripheral wall of the through hole, the sealing member having a mounting hole through which the metal conductor passes.

[0013] In some embodiments, the first insulating member is stacked with the inner sidewall of the battery casing, the first insulating member is provided with a first connection hole, the metal conductor passes through the first connection hole, and the sealing member extends to the first connection hole and is connected to the inner peripheral wall of the first connection hole.

[0014] In some embodiments, the second insulating member is stacked with the outer wall of the battery casing, the second insulating member is provided with a second connection hole, the metal conductor passes through the second connection hole, and the sealing member extends to the second connection hole and is connected to the inner peripheral wall of the second connection hole.

[0015] In some embodiments, the electrode assembly includes a first adhesive member located between the first insulating member and the first portion, with the first adhesive member having the first insulating member and the first portion respectively connected to its two sides;

[0016] And / or,

[0017] The electrode assembly includes a second adhesive member located between the second insulating member and the second portion, with the second adhesive member having the second insulating member and the second portion connected to its two sides respectively.

[0018] In some embodiments, the thermal expansion coefficient of the sealing member is α1, the thermal expansion coefficient of the battery casing is α2, and the thermal expansion coefficient of the metal conductor is α3, wherein the battery cell satisfies: α2≤α1≤α3.

[0019] In some embodiments, the insulating component is made of at least one of PFA, PP, PBT, PEEK, or ceramic; and / or the metallic conductor is made of aluminum or copper; and / or the sealing element is glass or adhesive.

[0020] A second aspect of this utility model provides an electrical device including a battery unit as described in the above embodiments.

[0021] Compared with the prior art, the beneficial effects of this utility model include:

[0022] In this invention, the battery cell includes a battery casing and an electrode assembly. The electrode assembly includes an insulating component and a metal conductor. The battery casing has a through hole. The insulating component includes a first insulating element and a second insulating element. The first insulating element is connected to the inside of the battery casing, and the second insulating element is connected to the outside of the battery casing. In the prior art, rivets are sequentially inserted through an external insulating element, a battery casing, an internal insulating element, and an internal metal conductor. Riveting achieves electrical connection and terminal sealing between the internal metal conductor and the external rivet. However, there is contact resistance between the internal metal conductor and the rivet, which increases the internal resistance of the battery cell and affects its performance. In this invention, the metal conductor has a through hole. A portion of the metal conductor extends to the inside of the battery casing and connects to the first insulating element, while another portion extends to the outside of the battery casing and connects to the second insulating element. This allows the metal conductor to be directly led out from inside the battery casing, effectively reducing the internal resistance of the terminal and improving the battery cell performance. Furthermore, this invention eliminates the need for rivets and their riveting process, effectively simplifying the manufacturing process and saving material costs. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the battery cell viewed from the outside in one embodiment of the present invention;

[0025] Figure 2 This is a schematic diagram of the battery cell viewed from the inside in one embodiment of the present invention; wherein the side cover of the battery cell is removed.

[0026] Figure 3 This is an exploded view of a battery cell in one embodiment of the present invention;

[0027] Figure 4 for Figure 3 A magnified view of a portion of point A in the middle;

[0028] Figure 5 This is an exploded view of a battery cell according to one embodiment of the present invention; wherein the battery casing of the battery cell has been removed.

[0029] Figure 6 This is a cross-sectional view of a battery cell in one embodiment of the present invention;

[0030] Figure 7 for Figure 6 A magnified view of a portion of point B in the middle;

[0031] Figure 8 This is a partial cross-sectional view of a battery cell in one embodiment of the present invention.

[0032] Explanation of icon numbers:

[0033] Battery cell 10;

[0034] Battery casing 100; through hole 110; inner side wall 120; outer side wall 130;

[0035] Insulation component 200;

[0036] First insulating component 210; first groove 211; first connecting hole 212;

[0037] Second insulating component 220; second groove 221; second connecting hole 222;

[0038] Metallic conductor 300; First part 310; Second part 320;

[0039] Sealing part 400; mounting hole 410.

[0040] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0041] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0042] The first aspect of this utility model provides a battery cell 10 that can effectively reduce terminal resistance and improve cell performance. It should be noted that the battery cell 10 can be used in a battery. The following refers to... Figures 1 to 8 The present application will now describe a battery cell 10 according to an embodiment. Specifically, the battery cell 10 includes a battery casing 100 and an electrode assembly. The electrode assembly includes an insulating component 200 and a metal conductor 300.

[0043] Reference Figures 1 to 4The battery casing 100 is used to house the battery cells. It can be understood that the battery casing 100 is the outer shell of the battery, and can be a steel casing or an aluminum casing. The battery casing 100 has a through hole 110 for the metal conductor 300 to pass through. Exemplarily, the through hole 110 can be a rectangular hole or a circular hole, etc. The specific structural configuration of the through hole 110 can be determined according to the actual situation. This embodiment uses a rectangular hole 110 as an example for explanation. The length and width dimensions of the through hole 110 can be larger than the length and width dimensions of the metal conductor 300, which facilitates the assembly and connection between the battery casing 100 and the metal conductor 300.

[0044] Reference Figures 1 to 4 The insulating component 200 can prevent the metal conductor 300 from being directly connected to the battery casing 100. The insulating component 200 includes a first insulating element 210 and a second insulating element 220. In some embodiments, the structure of the first insulating element 210 can be the same as that of the second insulating element 220. In other embodiments, the structure of the first insulating element 210 can be different from that of the second insulating element 220. This application embodiment uses the example of the first insulating element 210 and the second insulating element 220 having different structures as an example. The first insulating element 210 can be connected to the inside of the battery casing 100, and the second insulating element 220 can be connected to the outside of the battery casing 100. It can be understood that the first insulating element 210 and the second insulating element 220 can be arranged separately with spacing, or they can be arranged as a single unit, depending on the actual situation.

[0045] Reference Figures 3 to 7 The metal conductor 300 is used to connect the internal circuitry of the battery with the external circuitry. The metal conductor 300 can be arranged through the through-hole 110. Specifically, a portion of the metal conductor 300 can extend to the inside of the battery casing 100 and connect to the first insulating member 210, while another portion can extend to the outside of the battery casing 100 and connect to the second insulating member 220.

[0046] In the technical solution of this utility model, the battery cell 10 includes a battery casing 100 and an electrode assembly. The electrode assembly includes an insulating component 200 and a metal conductor 300. The battery casing 100 is provided with a through hole 110. The insulating component 200 includes a first insulating member 210 and a second insulating member 220. The first insulating member 210 is connected to the inner side of the battery casing 100, and the second insulating member 220 is connected to the outer side of the battery casing 100. In the prior art, rivets are sequentially inserted through an external insulating member, a battery casing, an internal insulating member, and an internal metal conductor, and the electrical connection and terminal sealing between the internal metal conductor and the external rivet are achieved through riveting. However, there is contact resistance between the internal metal conductor and the rivet, which will lead to an increase in the internal resistance of the battery cell and affect the performance of the battery cell. In this design, the metal conductor 300 passes through the through hole 110. A portion of the metal conductor 300 extends into the inner side of the battery casing 100 and connects to the first insulating member 210, while another portion extends into the outer side of the battery casing 100 and connects to the second insulating member 220. This means the metal conductor 300 can be directly led from inside the battery casing 100 to the outside, effectively reducing the internal resistance of the terminal and improving cell performance. Furthermore, this design eliminates the need for rivets and their riveting process, effectively simplifying the manufacturing process and saving material costs.

[0047] Reference Figures 3 to 8 The specific extension configuration of the metal conductor 300 is described below. In some embodiments, the metal conductor 300 includes a first portion 310, as shown below. Figure 2 In terms of orientation, the portion of the metal conductor 300 located inside the battery casing 100 can be a first portion 310. The first portion 310 can be connected to the first insulating member 210, and can extend into the inner side of the battery casing 100, with its specific extension length depending on the actual situation. The first portion 310 is at least partially bent relative to the battery casing 100 and stacked with the first insulating member 210. In this design, the bent arrangement of the first portion 310 of the metal conductor 300 effectively improves the stability of its assembly connection with the battery casing 100 and eliminates the need for rivets and their riveting process, effectively simplifying the assembly process.

[0048] Reference Figures 3 to 8 The specific extension configuration of the metal conductor 300 is described below. In some embodiments, the metal conductor 300 includes a second portion 320, which can be connected to the first portion 310, as shown below. Figure 1In terms of orientation, the portion of the metal conductor 300 located outside the battery casing 100 can be a second portion 320. The second portion 320 can be connected to the second insulating member 220, and can extend to the outside of the battery casing 100. Its specific extension length can be determined according to actual conditions. In this embodiment, the extension length of the first portion 310 is greater than the extension length of the second portion 320 for illustration. The second portion 320 is at least partially bent relative to the battery casing 100 and stacked with the second insulating member 220. In this solution, the bent arrangement of the second portion 320 of the metal conductor 300 effectively improves the stability of its assembly connection with the battery casing 100 and eliminates the need for rivets and their riveting process, effectively simplifying the assembly process.

[0049] Reference Figures 3 to 8 The specific assembly configuration of the first insulating member 210 and the metal conductor 300 is described below. In some embodiments, the first insulating member 210 has a first groove 211 on the side opposite to the second insulating member 220. The first part 310 of the metal conductor 300 can be accommodated in the first groove 211. The first groove 211 can limit the position of the metal conductor 300. This solution can improve the assembly connection accuracy between the metal conductor 300 and the first insulating member 210 and ensure the stability of the assembly connection between the metal conductor 300 and the first insulating member 210.

[0050] Reference Figures 3 to 8 The specific assembly configuration of the second insulating member 220 and the metal conductor 300 is described below. In some embodiments, the second insulating member 220 has a second groove 221 on the side opposite to the first insulating member 210. The second part 320 of the metal conductor 300 can be accommodated in the second groove 221. The second groove 221 can limit the position of the metal conductor 300. This solution can improve the assembly connection accuracy between the metal conductor 300 and the second insulating member 220 and ensure the stability of the assembly connection between the metal conductor 300 and the second insulating member 220.

[0051] Reference Figures 4 to 7The specific assembly and connection configuration of the metal conductor 300 and the battery casing 100 is described below. In some embodiments, the electrode assembly includes a sealing member 400, which can seal the gap between the metal conductor 300 and the through hole 110. Specifically, the sealing member 400 can be disposed within the through hole 110, and the sealing member 400 can be connected to the inner peripheral wall of the through hole 110. A mounting hole 410 can be provided inside the sealing member 400, and the metal conductor 300 can pass through the mounting hole 410, that is, the sealing member 400 can be arranged around the metal conductor 300. It can be understood that the structural configuration of the mounting hole 410 can be similar to that of the through hole 110, and the cross-sectional dimension of the mounting hole 410 can be larger than the cross-sectional dimension of the metal conductor 300. The sealing member 400 of this solution can effectively improve the sealing performance of the assembly and connection between the metal conductor 300 and the battery casing 100, and ensure the stability and reliability of the assembly and connection between the metal conductor 300 and the battery casing 100.

[0052] Reference Figures 4 to 7 The specific assembly and connection configuration of the metal conductor 300 and the first insulating member 210 is described below. In some embodiments, the first insulating member 210 can be stacked with the inner sidewall 120 of the battery casing 100. The first insulating member 210 can be provided with a first connecting hole 212, the specific configuration of which can be similar to that of the through hole 110, and the cross-sectional dimension of the first connecting hole 212 can be larger than that of the metal conductor 300. The metal conductor 300 can pass through the first connecting hole 212, and the sealing member 400 can be connected to the inner peripheral wall of the first connecting hole 212, extending to the first connecting hole 212. It can be understood that the sealing member 400 can penetrate the first connecting hole 212. The sealing member 400 of this solution can extend to the first connecting hole 212, which can effectively improve the sealing performance of the assembly and connection between the metal conductor 300 and the first insulating member 210, and ensure the stability and reliability of the assembly and connection between the metal conductor 300 and the battery casing 100.

[0053] Reference Figures 4 to 7The specific assembly and connection configuration of the metal conductor 300 and the second insulating member 220 is described below. In some embodiments, the second insulating member 220 can be stacked with the inner sidewall 120 of the battery casing 100. The second insulating member 220 can be provided with a second connecting hole 222. The specific configuration of the second connecting hole 222 can be similar to that of the through hole 110, and the cross-sectional dimension of the second connecting hole 222 can be larger than the cross-sectional dimension of the metal conductor 300. The metal conductor 300 can pass through the second connecting hole 222, and the sealing member 400 can be connected to the inner peripheral wall of the second connecting hole 222. The sealing member 400 can extend into the second connecting hole 222. It can be understood that the sealing member 400 can penetrate through the second connecting hole 222. The sealing member 400 of this solution can extend into the second connecting hole 222, which can effectively improve the sealing performance of the assembly and connection between the metal conductor 300 and the second insulating member 220, and ensure the stability and reliability of the assembly and connection between the metal conductor 300 and the battery casing 100.

[0054] The specific connection arrangement between the first insulating member 210 and the metal conductor 300 is described below. In some embodiments, the electrode assembly includes a first adhesive member, which may be disposed between the first insulating member 210 and the first portion 310 of the metal conductor 300. The first adhesive member connects the first insulating member 210 and the first portion 310 on both sides, and the specific arrangement and material selection of the first adhesive member can be determined according to the actual situation. The first adhesive member of this solution enables the first portion 310 to be bonded to the first insulating member 210, effectively suppressing the springback warping of the first portion 310 and ensuring the stability and reliability of the assembly connection between the metal conductor 300 and the base shell.

[0055] The specific connection arrangement between the second insulating member 220 and the metal conductor 300 is described below. In some embodiments, the electrode assembly includes a second adhesive member, which may be disposed between the second insulating member 220 and the second portion 320 of the metal conductor 300. The two sides of the second adhesive member are respectively connected to the second insulating member 220 and the second portion 320. The specific arrangement and material selection of the second adhesive member can be determined according to the actual situation. The second adhesive member of this solution enables the second portion 320 to be bonded to the second insulating member 220, effectively suppressing the second portion 320 from springback and warping, and ensuring the stability and reliability of the assembly connection between the metal conductor 300 and the base shell.

[0056] The relative characteristic settings of the sealing component 400, battery casing 100, and metal conductor 300 are described below. In some embodiments, the coefficient of thermal expansion of the sealing component 400 is α1, the coefficient of thermal expansion of the battery casing 100 is α2, and the coefficient of thermal expansion of the metal conductor 300 is α3. The battery cell 10 satisfies: α2≤α1≤α3. The specific selection of the coefficients of thermal expansion of the sealing component 400, battery casing 100, and metal conductor 300 can be determined according to the actual situation. In this scheme, the coefficients of thermal expansion of the three components are close, which can better ensure the sealing and insulation performance of the casing, and improve the reliability and stability of the battery performance under high and low temperature operating conditions.

[0057] The specific material settings for each part of the battery cell 10 are described below. In some embodiments, the insulating component 200 is made of at least one of PFA, PP, PBT, PEEK, or ceramic. In other embodiments, the metal conductor 300 is made of aluminum or copper, which have good electrical conductivity. In other embodiments, the sealing member 400 is made of glass or adhesive, and the sealing member 400 has sealing, insulation, fixing, waterproofing, and corrosion resistance properties, which can ensure the performance of the battery cell.

[0058] The following describes the specific assembly process of a battery cell 10 according to an embodiment of this application. First, a through hole 110 is made in the battery casing 100, a first connecting hole 212 is made in the first insulating member 210, and a second connecting hole 222 is made in the second insulating member 220. Next, a metal conductor 300 is sequentially passed through the first connecting hole 212, the through hole 110, and the second connecting hole 222. Then, the metal conductor 300 is bent for the first time, so that its first part 310 is stacked and tightly arranged with the first insulating member 210. Then, a sealing member 400 is injected into the gap between the first insulating member 210, the battery casing 100, the second insulating member 220, and the metal conductor 300. Finally, the metal conductor 300 is bent for the second time, so that its second part 320 is stacked and tightly arranged with the second insulating member 220.

[0059] A second aspect of this utility model provides an electrical device, which includes the battery unit 10 described in the above embodiment. The battery unit 10 is used to supply power to the electrical device. It is understood that the electrical device can be a mobile phone, tablet computer, laptop computer, battery-powered toy, power tool, or electric vehicle, etc., and the specific application depends on the actual situation. The battery in this solution can ensure the stability and reliability of the electrical device's operation.

[0060] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0061] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or," "and / or," or "and / or" throughout the text implies three parallel solutions. For example, "α and / or B" includes solution α, solution B, or a solution where α and B are simultaneously satisfied. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0062] The above are merely preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural transformations made based on the inventive concept of this utility model and the contents of this utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this utility model.

Claims

1. A battery cell, characterized in that, The battery cell includes: The battery casing has through holes; An electrode assembly includes an insulating component and a metal conductor. The insulating component includes a first insulating member and a second insulating member. The first insulating member is connected to the inner side of the battery casing, and the second insulating member is connected to the outer side of the battery casing. The metal conductor passes through the through hole. A portion of the metal conductor extends to the inside of the battery casing and is connected to the first insulating member, while another portion extends to the outside of the battery casing and is connected to the second insulating member.

2. The battery cell as described in claim 1, characterized in that, The metallic conductor includes a first portion that extends into the inside of the battery casing and is connected to the first insulating member. The first portion is at least partially bent relative to the battery casing to be stacked with the first insulating member.

3. The battery cell as described in claim 2, characterized in that, The metal conductor includes a second portion connected to the first portion, the second portion extending to the outside of the battery casing and connected to the second insulating member, the second portion being at least partially bent relative to the battery casing to be stacked with the second insulating member.

4. The battery cell as described in claim 3, characterized in that, The first insulating member has a first groove on the side opposite to the second insulating member, and the first portion is at least partially accommodated in the first groove; and / or, The second insulating member has a second groove on the side opposite to the first insulating member, and the second part is at least partially accommodated in the second groove.

5. The battery cell as described in claim 1, characterized in that, The electrode assembly includes a sealing member disposed within the through hole and connected to the inner peripheral wall of the through hole. The sealing member has a mounting hole through which the metal conductor passes.

6. The battery cell as described in claim 5, characterized in that, The first insulating member is stacked with the inner sidewall of the battery casing. The first insulating member is provided with a first connecting hole. The metal conductor passes through the first connecting hole. The sealing member extends to the first connecting hole and is connected to the inner peripheral wall of the first connecting hole.

7. The battery cell as described in claim 6, characterized in that, The second insulating member is stacked with the outer wall of the battery casing. The second insulating member is provided with a second connecting hole. The metal conductor passes through the second connecting hole. The sealing member extends to the second connecting hole and is connected to the inner peripheral wall of the second connecting hole.

8. The battery cell as claimed in claim 7, characterized in that, The metal conductor includes a first part and a second part that are connected to each other. The first part extends to the inside of the battery case and is connected to the first insulating member, and the second part extends to the outside of the battery case and is connected to the second insulating member. The electrode assembly includes a first adhesive member located between the first insulating member and the first portion, with the first adhesive member connected to the first insulating member and the first portion on both sides respectively. And / or, The electrode assembly includes a second adhesive member located between the second insulating member and the second portion, with the second adhesive member having the second insulating member and the second portion connected to its two sides respectively.

9. The battery cell as described in claim 5, characterized in that, The thermal expansion coefficient of the sealing component is α1, the thermal expansion coefficient of the battery casing is α2, and the thermal expansion coefficient of the metal conductor is α3, wherein the battery cell satisfies: α2≤α1≤α3.

10. The battery cell as claimed in claim 5, characterized in that, The insulating component is made of at least one of PFA, PP, PBT, PEEK, or ceramic; and / or the metallic conductor is made of aluminum or copper; and / or the sealing element is made of glass or adhesive.

11. Electrical equipment, characterized in that, Includes the battery cell as described in any one of claims 1-10.

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