Battery cell and battery pack

Abstract

The utility model relates to the technical field of batteries, and discloses a battery cell and a battery pack, the battery cell comprises: a housing, which is provided with a mounting cavity, and the first end of the housing is provided with a mounting hole; the pole group is arranged in the mounting cavity, and the pole group is provided with a pole lug; the electrode terminal comprises a pole and a connecting piece; the pole is mounted in the mounting hole; a through hole is formed in the pole along the axial direction of the mounting hole; the connecting piece is arranged between the pole group and the shell; the connecting piece comprises a first connecting part and a second connecting part which are connected with each other, and the first connecting part is electrically connected with the tab; and the second connecting part is provided with a convex part, and the convex part is arranged in the through hole in a penetrating manner and is electrically connected with the pole through the through hole. According to the battery cell and the battery pack disclosed by the utility model, pole materials are saved, the production cost is reduced, and the production efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and particularly relates to a battery cell and a battery pack. Background Art

[0002] The electrical connection between the pole column and the pole ear of the battery cell is usually realized by using a connecting piece, that is, the pole column and the pole ear are respectively connected to different positions of the connecting piece.

[0003] In some technical solutions, the pole column and the connecting piece are assembled on the housing. Among them, the pole group and the connecting piece are located inside the housing, and the pole column penetrates from the outside of the housing to the inside of the housing to realize the connection between the connecting piece and the pole ear and the pole column of the pole group respectively. However, in actual assembly, it is difficult to connect the pole column and the connecting piece outside the housing. In order to realize the connection between the pole column and the connecting piece, the structure of the pole column is often designed to be relatively complex, which not only increases the material consumption of the pole column, improves the production cost, but also makes the production process of the pole column cumbersome and reduces the production efficiency. Summary of the Utility Model

[0004] The purpose of the utility model is to overcome the defects that the pole column in the related technology has a large amount of material used and a cumbersome production process, which increases the production cost and reduces the production efficiency, so as to provide a battery cell and a battery pack.

[0005] In a first aspect, the utility model provides a battery cell, including: a housing having an installation cavity therein, and an installation hole provided at a first end of the housing; a pole group provided in the installation cavity, the pole group being provided with pole ears; an electrode terminal, the electrode terminal including a pole column and a connecting member; the pole column is installed in the installation hole; along the axial direction of the installation hole, the pole column is provided with a through hole; the connecting member is provided between the pole group and the housing; the connecting member includes a first connecting portion and a second connecting portion connected to each other, the first connecting portion is electrically connected to the pole ear; the second connecting portion is provided with a convex portion, the convex portion passes through the through hole, and is electrically connected to the pole column through the through hole.

[0006] Optionally, a groove is formed at an end of the convex portion away from the pole column.

[0007] Optionally, the second connecting portion further includes a first edge portion that extends around the convex portion; the first edge portion is located on one side of the pole column and abuts against the pole column.

[0008] Optionally, an annular card slot is provided on the outer side of the pole column, and the annular card slot is clamped on the housing.

[0009] Optionally, the pole column includes a central portion, a second edge portion and a third edge portion that extend around the central portion, the through hole is provided in the central portion, and an annular card slot is formed between the second edge portion and the third edge portion.

[0010] Optionally, the battery cell further includes a first insulating seal, which is sleeved outside the pole column, and at least part of its structure is clamped and fixed between the annular card slot and the housing.

[0011] Optionally, a first through hole is further provided at the first end of the housing, and the first through hole is correspondingly arranged with the first connecting part and the tab. The first through hole is adapted to expose at least part of the structure of the first connecting part and the tab.

[0012] Optionally, the battery cell further includes a second insulating seal, which is connected to the housing and seals the first through hole; and a liquid injection hole and an explosion-proof valve are provided on the second insulating seal.

[0013] Optionally, two mounting holes are provided at the first end of the housing, and the two mounting holes are respectively located on both sides of the first through hole; the electrode terminals include a positive terminal and a negative terminal, and the positive terminal and the negative terminal are respectively mounted in the two mounting holes; the tabs include a positive tab and a negative tab, the positive tab is electrically connected to the positive terminal, and the negative tab is electrically connected to the negative terminal.

[0014] In a second aspect, the present invention further provides a battery pack, including: at least one battery cell as described above.

[0015] By using the technical solution of the present invention, a through hole is provided on the pole column, a convex part is provided on the second connecting part of the connecting piece, and the convex part penetrates through the through hole. The connecting piece is electrically connected to the pole column through the through hole. With this arrangement, the through hole can expose the convex part of the connecting piece outside the housing, and the electrical connection between the convex part and the pole column can be realized outside the housing through the through hole. That is, the electrical connection position between the pole column and the connecting piece is transferred outside the housing, which is convenient for the assembly of the two. Moreover, the structure of the pole column is simple, easy to manufacture, improves the production efficiency of the battery cell, and the through hole saves the pole column material and reduces the production cost. Description of the Drawings

[0016] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0017] Figure 1 It is a schematic structural diagram of a battery cell according to an embodiment of the present invention;

[0018] Figure 2 It is a cross-sectional view of a battery cell according to an embodiment of the present invention;

[0019] Figure 3 For Figure 2Partial enlarged schematic diagram of A;

[0020] Figure 4 is Figure 2 Partial enlarged schematic diagram of B in;

[0021] Figure 5 Schematic diagram of an assembly structure of a tab and a connecting member according to an embodiment of the present utility model Figure 1 ;

[0022] Figure 6 is Figure 5 Internal structure schematic diagram of;

[0023] Figure 7 Schematic diagram of an assembly structure of a tab and a connecting member according to an embodiment of the present utility model Figure 2 ;

[0024] Figure 8 is Figure 7 Internal structure schematic diagram of.

[0025] Explanation of reference numerals:

[0026] 1. Housing; 10. First end; 11. Installation cavity; 12. Installation hole; 13. First through hole;

[0027] 2. Electrode group; 21. Tab; 211. Positive tab; 212. Negative tab;

[0028] 3. Terminal; 3a. Positive terminal; 3b. Negative terminal; 31. Through hole; 32. Annular card slot; 33. Central part; 34. Second edge part; 35. Third edge part;

[0029] 4. Connecting member; 41. First connecting part; 42. Second connecting part; 421. Protrusion; 422. Groove; 423. First edge part;

[0030] 5. First insulating seal; 51. Upper plastic part; 52. Sealing ring; 53. Lower plastic part;

[0031] 6. Second insulating seal; 61. Liquid injection hole; 62. Explosion-proof valve. Detailed implementation manners

[0032] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0033] The following will describe embodiments of the present utility model in conjunction with Figures 1 to 8 .

[0034] According to an embodiment of the present utility model, a battery pack is provided, which includes at least one battery cell. It can be understood that the battery pack may include one, two or more battery cells. The present utility model does not specifically limit the number of battery cells provided, as long as the design requirements are met.

[0035] Furthermore, as Figures 1 - 4 shown, the battery cell includes a housing 1, a pole group 2 disposed in the housing 1, and an electrode terminal disposed on the housing 1. A partial structure of the electrode terminal is located inside the housing 1 and is electrically connected to the pole group 2, and a partial structure of the electrode terminal is located outside the housing 1 and is adapted to perform electric energy transmission with an external component.

[0036] Specifically, an installation cavity 11 is provided inside the housing 1, and an installation hole 12 is provided at a first end 10 of the housing 1. The pole group 2 is disposed in the installation cavity 11, and the pole group 2 is provided with a pole tab 21; the pole tab 21 is correspondingly disposed at the first end 10 of the housing 1, and the pole tab 21 is electrically connected to the electrode terminal. The electrode terminal includes a pole post 3 and a connecting member 4. The pole post 3 is installed in the installation hole 12, the connecting member 4 is disposed between the pole group 2 and the housing 1, and the pole post 3 is electrically connected to the connecting member 4. And a partial structure of the pole post 3 is located outside the housing 1 to perform electric energy transmission with an external component. The connecting member 4 is located inside the housing 1, and a partial structure of the connecting member 4 is electrically connected to the pole tab 21.

[0037] More specifically, along the axial direction of the installation hole 12, the pole post 3 is provided with a through hole 31. The connecting member 4 includes a first connecting portion 41 and a second connecting portion 42 connected to each other. The first connecting portion 41 is located inside the housing 1 and is electrically connected to the pole tab 21. The second connecting portion 42 is provided with a convex portion 421. The convex portion 421 passes through the through hole 31 and is electrically connected to the pole post 3 through the through hole 31.

[0038] It can be understood that the pole tab 21, the pole post 3 and the connecting member 4 are all conductive, and electrical connection can be achieved through contact mechanical connection among the three. Among them, the specific materials of the pole tab 21, the pole post 3 and the connecting member 4 are all conventional materials in the art and will not be elaborated herein.

[0039] Exemplarily, the outer side of the convex portion 421 is welded to the hole wall of the through hole 31 to achieve the electrical connection between the second connecting portion 42 of the connecting member 4 and the pole post 3. Preferably, along the axial direction of the installation hole 12, the cross-sectional profile of the convex portion 421 is adapted to the cross-sectional profile of the through hole 31, and the outer side of the convex portion 421 is welded to the hole wall of the through hole 31 in a full circle. During actual assembly, welding between the convex portion 421 and the hole wall of the through hole 31 can be achieved through the through hole 31 outside the housing 1.

[0040] The present utility model does not specifically limit the shapes and structures of the convex portion 421 and the through hole 31, as long as the two can be adapted to each other. Exemplarily, the through hole 31 is a circular hole, and correspondingly, the convex portion 421 is cylindrical.

[0041] By using the technical solution of the present utility model, a through hole 31 is provided on the pole column 3, a convex portion 421 is provided on the second connection portion 42 of the connecting member 4, the convex portion 421 is inserted into the through hole 31, and the connecting member 4 is electrically connected to the pole column 3 through the through hole 31. With such a setting, the through hole 31 can expose the convex portion 421 of the connecting member 4 to the outside of the housing 1, and the electrical connection between the convex portion 421 and the pole column 3 can be realized outside the housing 1 through the through hole 31. That is to say, the electrical connection position between the pole column 3 and the connecting member 4 is transferred to the outside of the housing 1, which is convenient for the assembly of the two. Moreover, the structure of the pole column 3 is simple, easy to manufacture, improving the production efficiency of the battery cell. The provision of the through hole 31 saves the material of the pole column 3 and reduces the production cost. In addition, transferring the electrical connection position between the pole column 3 and the connecting member 4 to the outside of the housing 1 can also prevent impurities such as metal chips generated during electrical connection (such as welding) from entering the housing 1, improving the safety of the battery cell.

[0042] Further, as Figure 3 and Figure 4 shown, in some embodiments, an annular clamping groove 32 is provided on the outer side of the pole column 3, and the annular clamping groove 32 is clamped on the housing 1, which is convenient for assembly and improves the assembly efficiency.

[0043] Specifically, in some embodiments, the pole column 3 includes a central portion 33 and a second edge portion 34 and a third edge portion 35 extending around the central portion 33. The above-mentioned through hole 31 is provided in the central portion 33, and the annular clamping groove 32 is formed between the second edge portion 34 and the third edge portion 35. That is to say, the pole column 3 is generally annular, the above-mentioned annular clamping groove 32 is provided on the outer side of the pole column 3, and the above-mentioned through hole 31 is opened in the middle of the pole column 3. With such a setting, the structure of the pole column 3 is simple and can be formed by one-time stamping without secondary processing, with high production efficiency.

[0044] More specifically, the second edge portion 34 is located outside the housing 1, the third edge portion 35 is located inside the housing 1, and the annular clamping groove 32 formed between the second edge portion 34 and the third edge portion 35 is clamped to the housing 1, specifically clamped to the hole wall on the periphery of the mounting hole 12 of the housing 1. The central portion 33 is located in the middle of the mounting hole 12, and the through hole 31 of the central portion 33 is disposed opposite to the convex portion 421 to facilitate the connection between the pole column 3 and the connecting member 4.

[0045] Further, the terminal post 3 includes a positive terminal post 3a and a negative terminal post 3b. Both the positive terminal post 3a and the negative terminal post 3b include the above-mentioned central portion 33, a through hole 31 provided in the central portion 33, a first edge portion 423, a second edge portion 34, and an annular slot 32 formed between the first edge portion 423 and the second edge portion 34. The difference between them lies in the materials. The positive terminal post 3a is made of a positive electrode material. The central portion 33, the first edge portion 423, and the second edge portion 34 of the positive terminal post 3a are made of the same material, such as copper. The negative terminal post 3b is made of a negative electrode material. The central portion 33 and the first edge portion 423 of the negative terminal post 3b are made of the same material, such as aluminum. The second edge portion 34 of the negative terminal post 3b is made of another material, such as copper.

[0046] Further, as Figure 3 and Figure 4 shown, in some embodiments, a groove 422 is formed at one end of the convex portion 421 away from the terminal post 3 to save the material of the connecting member 4.

[0047] In some embodiments, the second connecting portion 42 further includes a first edge portion 423 that extends around the convex portion 421. The first edge portion 423 is located on one side of the terminal post 3 and abuts against the terminal post 3. Specifically, the first edge portion 423 abuts against the second edge portion 34 of the terminal post 3, and the two are in contact with each other, which can further improve the reliability of the electrical connection between the terminal post 3 and the connecting member 4.

[0048] Further, as Figure 6 and 8 shown, in some embodiments, the first connecting portion 41 and the second connecting portion 42 are integrally formed. The first connecting portion 41 and the first edge portion 423 are in a sheet-like structure, and the convex portion 421 is a thin-walled convex platform. The overall structure of the connecting member 4 is simple and can be formed by one-time stamping without secondary processing, with high production efficiency.

[0049] Further, in some embodiments, the battery cell further includes a first insulating seal 5. The first insulating seal 5 is used to fill the assembly gap between the terminal post 3 and the connecting member 4 and serves as an insulation between the housing 1, the terminal post 3, and the connecting member 4. Among them, the first insulating seal 5 is sleeved outside the terminal post 3, and at least part of its structure is clamped and fixed between the annular slot 32 and the housing 1. That is, the first insulating seal 5 is pressed and fixed on the housing 1 through the terminal post 3, which is easy to assemble.

[0050] Before assembly, the second edge portion 34 of the terminal post 3 extends along the axial direction of the through hole 31, that is, the second edge portion 34 is perpendicular to the third edge portion 35. During assembly, after the first insulating seal 5 is sleeved on the terminal post 3, the second edge portion 34 is folded by 90° to be substantially parallel to the third edge portion 35, and the state as shown in Figure 3 and Figure 4 can be formed.

[0051] Specifically, the first insulating seal 5 may include an upper plastic part 51, a sealing ring 52, and a lower plastic part 53 that are sequentially arranged along the axial direction of the mounting hole 12. Both the upper plastic part 51 and the sealing ring 52 are substantially annular. One end of the upper plastic part 51 is located outside the housing 1 and is tightly fitted between the second edge part 34 and the housing 1, and the other end abuts against the sealing ring 52. The lower plastic part 53 is in a sheet shape and is provided with a perforation. The lower plastic part 53 is located between the connecting member 4 and the housing 1 and is passed through the outside of the pole column 3 through the perforation.

[0052] Further, in some embodiments, as Figure 5 and 7 shown, the first end 10 of the housing 1 is further provided with a first through hole 13. The first through hole 13 is correspondingly arranged with the first connecting part 41 and the pole tab 21. The first through hole 13 is adapted to expose at least part of the structures of the first connecting part 41 and the pole tab 21, so as to facilitate the electrical connection between the first connecting part 41 and the pole tab 21 outside the housing 1.

[0053] During actual assembly, as Figure 5 and 6 shown, after the electrode group 2 is installed in the installation cavity 11, the pole tab 21 of the electrode group 2 extends out of the housing 1 through the first through hole 13, and part of the structure of the first connecting part 41 is exposed outside the housing 1 through the first through hole 13. As Figure 7 and 8 shown, the pole tab 21 is bent towards the first connecting part 41, and the two are welded to achieve the electrical connection between the pole tab 21 and the connecting member 4. Exemplarily, at the first through hole 13, welding processes such as laser welding or ultrasonic welding can be used to weld the first connecting part 41 of the connecting member 4 and the pole tab 21.

[0054] It can be understood that the number of the pole tabs 21 provided in this solution is not specifically limited, as long as the design requirements are met. Exemplarily, as Figures 5 to 8 shown, the pole tab 21 includes a positive pole tab 211 and a negative pole tab 212. Both the positive pole tab 211 and the negative pole tab 212 are provided with two, and the connecting member 4 is provided with two. The two positive pole tabs 211 are respectively located on both sides of the first connecting part 41 of one of the connecting members 4 and are bent towards the middle of the first connecting part 41; the two negative pole tabs 212 are respectively located on both sides of the first connecting part 41 of the other connecting member 4 and are bent towards the middle of the first connecting part 41.

[0055] In this embodiment, the electrical connection between the pole tab 21 and the connecting member 4 can be achieved by bending the pole tab 21, reducing the bending process of the connecting member 4, and further improving the production efficiency. Moreover, the space occupied by the connection between the pole tab 21 and the connecting member 4 inside the battery cell is relatively small, improving the space utilization rate inside the battery cell.

[0056] Further, in some embodiments, as Figure 1 shown, the battery cell further includes a second insulating seal 6, which is connected to the housing 1 and seals the first through hole 13 to ensure the tightness inside the battery cell. Exemplarily, the second insulating seal can be welded or bonded to the housing 1, etc.

[0057] Further, in some embodiments, the second insulating seal 6 is provided with a liquid injection hole 61 and an explosion-proof valve 62. The liquid injection hole 61 penetrates through the second insulating seal 6 for injecting electrolyte into the electrode group 2 from outside the housing 1. The explosion-proof valve 62 can be a weak area on the second insulating seal 6 to prevent the pressure inside the battery cell from being too high and causing an explosion. Arranging the liquid injection hole 61 and the explosion-proof valve 62 on the second insulating seal 6 increases the welding area between the connecting member 4 and the tab 21 and improves the over-current capacity of the battery.

[0058] Further, in some embodiments, two mounting holes 12 are provided at the first end 10 of the housing 1, and the two mounting holes 12 are respectively located on both sides of the first through hole 13. The electrode terminals include a positive terminal and a negative terminal, and the positive terminal and the negative terminal are respectively mounted in the two mounting holes 12. Specifically, the positive terminal includes a positive electrode post 3a and a connecting member 4, and the negative terminal includes a negative electrode post 3b and another connecting member 4, that is, there are two connecting members 4, and the two connecting members 4 are respectively electrically connected to the positive electrode post 3a and the negative electrode post 3b. The tabs 21 include a positive tab 211 and a negative tab 212. The positive tab 211 is electrically connected to the positive terminal, specifically connected to the connecting member 4 of the positive terminal, and the negative tab 212 is electrically connected to the negative terminal, specifically connected to the connecting member 4 of the negative terminal. The connection manner between the connecting member 4 and the positive electrode post 3a or the negative electrode post 3b and between the connecting member 4 and the positive tab 211 or the negative tab 212 is the same as that in the above embodiments and will not be elaborated here.

[0059] In this embodiment, the positive terminal and the negative terminal of the battery cell are arranged at the same end of the housing 1, and the two connecting members 4 can respectively achieve electrical connection with the positive tab 211 and the negative tab 212 through the first through hole 13, with high assembly convenience and improved assembly efficiency.

[0060] In some embodiments, the housing 1 further has a second end opposite to the first end 10, and the second end is open to facilitate installing the electrode group 2 into the installation cavity 11 of the housing 1. After completing the assembly between the electrode group 2 and the electrode terminals, the open end of the second end can be sealed with a cover plate or the like.

[0061] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A battery cell, characterized in that: include: A housing, wherein the housing has a mounting cavity therein, and a mounting hole is provided at a first end of the housing; A pole group is arranged in the installation cavity, and the pole group is provided with pole ears; An electrode terminal, the electrode terminal comprising a pole and a connecting piece; the pole is installed in the mounting hole; the pole is provided with a through hole along the axial direction of the mounting hole; the connecting piece is arranged between the pole group and the shell; the connecting piece comprises a first connecting portion and a second connecting portion connected to each other, the first connecting portion is electrically connected to the pole ear; the second connecting portion is provided with a convex portion, the convex portion is passed through the through hole, and is electrically connected to the pole through the through hole.

2. The battery cell according to claim 1, characterized in that: A groove is formed at one end of the protrusion away from the pole.

3. The battery cell according to claim 1, characterized in that: The second connection portion further includes a first edge portion, which extends around the protrusion; the first edge portion is located on one side of the pole and abuts against the pole.

4. The battery cell according to claim 1, characterized in that: An annular groove is provided on the outer side of the pole, and the annular groove is clamped on the shell.

5. The battery cell according to claim 4, characterized in that: The pole comprises a central portion and a second edge portion and a third edge portion extending around the central portion. The through hole is arranged in the central portion, and the annular groove is formed between the second edge portion and the third edge portion.

6. The battery cell according to claim 4, characterized in that: The battery core further includes a first insulating seal, which is sleeved on the outer side of the pole, and at least a part of the structure of the first insulating seal is clamped and fixed between the annular groove and the shell.

7. The battery cell according to any one of claims 1 to 6, characterized in that: A first through hole is further provided at the first end of the shell. The first through hole is arranged corresponding to the first connecting portion and the pole lug. The first through hole is suitable for exposing at least a part of the structure of the first connecting portion and the pole lug.

8. The battery cell according to claim 7, characterized in that: The battery core further includes a second insulating seal, which is connected to the housing and blocks the first through hole; In addition, the second insulating seal is provided with a liquid injection hole and an explosion-proof valve.

9. The battery cell according to claim 7, characterized in that: The first end of the housing is provided with two mounting holes, and the two mounting holes are respectively located on two sides of the first through hole; The electrode terminal comprises a positive terminal and a negative terminal, and the positive terminal and the negative terminal are respectively installed in the two installation holes; The electrode tab includes a positive electrode tab and a negative electrode tab, the positive electrode tab is electrically connected to the positive electrode terminal, and the negative electrode tab is electrically connected to the negative electrode terminal.

10. A battery pack, characterized in that: include: At least one battery cell according to any one of claims 1 to 9.

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