Positive pole, battery and vehicle

Abstract

The utility model relates to the technical field of batteries, in particular to a positive pole column, a battery with the positive pole column and a vehicle with the battery, the positive pole column comprises a bottom surface and a first groove, the opening direction of the first groove is deviated from the bottom surface, the groove bottom of the first groove and the bottom surface form a bottom plate, and the bottom plate is suitable for being welded with a positive collector plate. According to the positive pole disclosed by the utility model, the groove bottom and the bottom surface of the first groove can form a thinner bottom plate by arranging the first groove, so that when the positive pole needs to be connected with a positive collector plate, penetration welding can be performed from the bottom plate to the positive collector plate; and at the moment, the bottom plate can be melted and adhered to the positive collector plate by only needing relatively small current, and the welding current is not easy to melt through the positive collector plate to cause leakage of the electrolyte.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a positive pole, a battery with the positive pole and a vehicle with the battery. Background Art

[0002] The positive current collector disc plays the role of conducting current between the positive electrode column and the battery cell. The positive current collector disc and the positive electrode column are connected by welding. In order to ensure that there is a large welding flow area between the positive current collector disc and the positive electrode column, and to prevent the connection area between the positive current collector disc and the positive electrode column from easily heating up and thermal runaway of the battery, the positive current collector disc and the positive electrode column are usually penetrated and welded. However, in actual production and manufacturing, when the positive electrode column and the positive current collector disc are penetrated and welded, the battery often leaks electrolyte and the connection between the positive current collector disc and the positive electrode column is poor, which leads to a low battery qualification rate. Utility Model Content

[0003] In view of the above-mentioned defects of the prior art, the technical problem to be solved by the present invention is to provide a positive electrode column, which can avoid the problems of battery electrolyte leakage and poor connection between the positive current collecting disc and the positive electrode column when penetrating welding with the positive electrode collecting disc.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0005] The utility model provides a positive pole column, comprising: a bottom surface and a first groove with an opening direction away from the bottom surface; the groove bottom of the first groove and the bottom surface form a bottom plate, and the bottom plate is suitable for welding with a positive current collecting disk.

[0006] Preferably, the thickness of the bottom plate is 0.5 to 2 times the thickness of the positive electrode current collecting disk.

[0007] The utility model also provides a battery, comprising a positive electrode current collecting disk and a positive electrode column, wherein the positive electrode column is the positive electrode column described above, and the bottom plate of the positive electrode column is welded to the positive electrode current collecting disk.

[0008] Preferably, the positive current collecting disc and the bottom plate are provided with a liquid injection hole connecting the positive current collecting disc and the bottom plate, the cross section of the liquid injection hole close to the positive current collecting disc is smaller than the cross section of the liquid injection hole close to the positive electrode column, and the liquid injection hole is suitable for filling with sealing glue.

[0009] Preferably, the battery further comprises a sealing cover, which is provided on a side of the bottom plate close to the bottom of the first groove to seal the liquid injection hole.

[0010] Preferably, the positive electrode column also includes a second groove. On a plane perpendicular to the thickness direction of the base plate, the cross-section of the second groove is larger than the cross-section of the first groove. A first annular surface is formed between the inner circumference of the second groove and the notch of the first groove, and the sealing cover is arranged on the first annular surface.

[0011] Preferably, the positive electrode column further includes a third groove, and on a plane perpendicular to the thickness direction of the bottom plate, the cross-section of the third groove is larger than the cross-section of the second groove, and a second annular surface is formed between the inner circumference of the third groove and the notch of the second groove.

[0012] Preferably, the second annular surface is flush with an end of the sealing cover away from the battery core.

[0013] Preferably, the battery further comprises a steel cover and plastic, the steel cover is sleeved on the outer peripheral wall of the positive electrode column, and at least a portion of the plastic is filled between the outer peripheral wall of the positive electrode column and the steel cover.

[0014] Preferably, the positive electrode column has a first end close to the positive current collecting disk, and an outer edge of the first end of the positive electrode column is provided with a receiving groove extending into the positive electrode column, and the receiving groove is suitable for receiving a portion of the insulating rubber sleeve.

[0015] Preferably, the positive electrode column has a second end away from the positive current collecting disk, a step is provided on the outer peripheral side of the second end of the positive electrode column, a groove is provided in the middle of the steel cover, a through hole is provided at the bottom of the groove that can be sleeved on the positive electrode column, the step, the groove and part of the insulating rubber sleeve form an annular groove with a folded angle, and the annular groove is filled with the plastic.

[0016] The present invention also provides a vehicle, which includes a battery, and the battery is the battery described above.

[0017] Compared with the prior art, the present invention has significant improvements:

[0018] The positive electrode column of the present invention, by providing a first groove, can form a thinner bottom plate with the bottom and bottom surface of the first groove. When the positive electrode column needs to be connected to the positive current collector, welding can be performed from the bottom plate to the positive current collector. Due to the thin bottom plate, only a small current is required to melt the bottom plate and adhere it to the positive current collector, and the welding current is not likely to melt through the positive collector, causing electrolyte leakage. Compared to the existing welding method of penetrating from a thicker positive electrode column to a thinner positive current collector, the positive electrode column of the present invention is more likely to melt through the bottom plate and form a larger flow area with the positive current collector, thereby preventing the connection area between the positive collector and the positive electrode column from heating up and causing thermal runaway of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1It is a cross-sectional view of a battery according to an embodiment of the present invention.

[0020] Figure 2 yes Figure 1 A magnified schematic diagram at point A.

[0021] Figure 3 yes Figure 2 Schematic diagram of the positive column in .

[0022] Figure 4 yes Figure 2 Schematic diagram of the connection between the positive electrode column and the positive current collecting disc.

[0023] Figure 5 It is an exploded view of a battery according to an embodiment of the present invention.

[0024] The description of the accompanying drawings is as follows:

[0025] 100. Battery;

[0026] 1. positive electrode current collecting plate; 11. first hole section;

[0027] 2. Positive pole; 21. Bottom surface; 22. First groove; 23. Second groove; 231. First annular surface; 24. Third groove; 241. Second annular surface; 25. Step; 26. Accommodating groove; 27. Bottom plate; 28. Second hole segment;

[0028] 3. Sealing glue;

[0029] 4. Sealing cover;

[0030] 5. Steel cover;

[0031] 6. Plastic;

[0032] 7. Insulation rubber sleeve;

[0033] 8. Battery cell. DETAILED DESCRIPTION

[0034] The following is a further detailed description of the specific embodiments of the present invention in conjunction with the accompanying drawings. These embodiments are only used to illustrate the present invention, and are not intended to limit the present invention.

[0035] In the description of the present invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific direction, be constructed, or operate in a specific direction. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0036] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0037] In addition, in the description of the present invention, unless otherwise specified, “a plurality of” means two or more.

[0038] like Figures 1 to 5 The figure shows an embodiment of the positive electrode column of the present invention. Figure 1 and Figure 5 The positive electrode column 2 of this embodiment is used in a battery 100. The battery 100 includes a positive current collecting plate 1, a positive electrode column 2, an insulating rubber sleeve 7, and a battery cell 8. The positive current collecting plate 1 is connected between the upper end of the battery cell 8 and the lower end of the positive electrode column 2. The insulating rubber sleeve 7 has a rubber groove. The positive current collecting plate 1 is located at the bottom of the rubber groove. The bottom of the rubber groove is provided with an avoidance hole that penetrates the wall thickness of the insulating rubber sleeve 7 and allows the insulating rubber sleeve 7 to be placed on the outer periphery of the positive electrode column 2. In the description of this utility model, it should be noted that the "upper" side refers to Figure 1 The upper side of the paper, and the "lower" side refers to Figure 1 The lower side of the paper, the up and down direction is also called the vertical direction.

[0039] See also Figures 1 to 4 The positive electrode column 2 of this embodiment includes a bottom surface 21 and a first groove 22 with an opening direction away from the bottom surface 21. The bottom of the first groove 22 and the bottom surface 21 form a bottom plate 27, which is suitable for welding with the positive current collecting disc 1.

[0040] Specifically, if Figure 3As shown, the positive electrode column 2 is provided with a first groove 22 with an opening facing upward, and the bottom surface 21 below the positive electrode column 2 and the bottom of the first groove 22 form a bottom plate 27. The bottom plate 27 is made of a conductive material. After the bottom plate 27 is welded to the positive current collecting disc 1, the positive electrode column 2 can transfer the current inside the battery cell 8 to the external electrical device through the positive current collecting disc 1.

[0041] By providing the first groove 22 of the positive electrode column 2, the bottom of the first groove 22 and the bottom surface 21 can form a thinner bottom plate 27. When the positive electrode column 2 needs to be welded to the positive current collecting disc 1, due to the thin bottom plate 27, only a small current is required to achieve penetration welding from the bottom plate 27 to the positive current collecting disc 1, effectively reducing the energy consumption of welding.

[0042] At the same time, since the bottom plate 27 is relatively thin, the small welding current can melt the bottom plate 27 without melting through the positive electrode current collecting disc 1 and causing the electrolyte in the battery cell 8 to leak from the positive electrode current collecting disc 1 .

[0043] In addition, compared with the existing penetration welding from the thicker positive electrode column to the thinner positive electrode current collecting disc 1, the positive electrode column 2 of this embodiment is more likely to melt through the bottom plate 27 and form a larger flow area with the positive electrode current collecting disc 1, thereby preventing the connection area between the positive electrode current collecting disc 1 and the positive electrode column 2 from heating up and causing thermal runaway of the battery 100.

[0044] Preferably, the thickness of the bottom plate 27 is between 0.5 and 2 times the thickness of the positive electrode current collecting disc 1. For example, if the thickness of the positive electrode current collecting disc 1 is 1 mm, the thickness of the bottom plate 27 can be between 0.5 mm and 2 mm. This ratio of the thickness of the bottom plate 27 to the thickness of the positive electrode current collecting disc 1 facilitates penetration welding of the bottom plate 27 and the positive electrode current collecting disc 1 without melting through the positive electrode current collecting disc 1 and causing electrolyte in the battery cells 8 to leak from the positive electrode current collecting disc 1.

[0045] like Figures 1 to 5 As shown, based on the above-mentioned positive electrode column 2, an embodiment of the present invention further provides a battery 100. The battery 100 of this embodiment includes a positive electrode column 2. The positive electrode column 2 is the positive electrode column 2 mentioned above in this embodiment. The bottom plate 27 of the positive electrode column 2 is welded to the positive current collecting disc 1.

[0046] Preferably, the positive electrode current collecting disc 1 and the bottom plate 27 are provided with an injection hole connecting the positive electrode current collecting disc 1 and the bottom plate 27 . The cross section of the injection hole close to the positive electrode current collecting disc 1 is smaller than the cross section of the injection hole close to the positive electrode column 2 . The injection hole is suitable for filling the sealing glue 3 .

[0047] Specifically, see Figure 4The positive electrode current collector disc 1 has a first hole section 11 extending through the thickness of the positive electrode current collector disc 1 , and the bottom plate 27 has a second hole section 28 extending through the thickness of the bottom plate 27 . The cross-section of the first hole section 11 is smaller than the cross-section of the second hole section 28 . The first hole section 11 and the second hole section 28 are connected to form an injection hole, through which electrolyte can be injected into the battery cell 8 . To prevent electrolyte from leaking from the injection hole, the injection hole is filled with a sealing compound 3 . The filled sealing compound 3 matches the cross-section of the injection hole. After the sealing compound 3 solidifies, the cross-section of the sealing compound 3 located in the first hole section 11 is smaller than the cross-section of the sealing compound 3 located in the second hole section 28 . Therefore, the sealing compound 3 not only seals the injection hole but also prevents the sealing compound 3 from falling into the battery cell 8 .

[0048] It should be noted that the present invention does not limit the specific shape of the injection hole. For example, Figure 4 As shown, the first hole segment 11 and the second hole segment 28 are both cylindrical holes, the diameter of the first hole segment 11 is smaller than the diameter of the second hole segment 28, and the first hole segment 11 and the second hole segment 28 form an annular step; the first hole segment 11 and / or the second hole segment 28 can also be tapered holes with gradually changing cross-sections, and the junction between the first hole segment 11 and the second hole segment 28 is a smooth transition.

[0049] Preferably, the battery 100 further includes a sealing cover 4, which is disposed on one side of the bottom plate 27 near the bottom of the first groove to seal the liquid injection hole. The present invention does not limit the method of sealing the sealing cover 4 with the positive electrode column 2. For example, the sealing cover 4 may be welded around the circumference of the positive electrode column 2 to seal the liquid injection hole, or the sealing cover 4 may be bonded to the positive electrode column 2 to seal the liquid injection hole. After the sealing cover 4 seals the liquid injection hole, electrolyte is less likely to leak from the battery cell 8.

[0050] Preferably, the positive electrode column 2 also includes a second groove 23. On a plane perpendicular to the thickness direction of the bottom plate 27, the cross-section of the second groove 23 is larger than the cross-section of the first groove 22. The second groove 23 is located above the first groove 22. A first annular surface 231 is formed between the inner circumferential surface of the second groove 23 and the notch of the first groove 22, and the sealing cover 4 is arranged on the first annular surface 231.

[0051] By positioning the sealing cover 4 on the first annular surface 231, the sealing cover 4 and the first groove 22 form a cavity that can accommodate the protrusions produced when the bottom plate 27 is welded to the positive electrode current collecting disc 1. Furthermore, since the sealing cover 4 is positioned on the first annular surface 231, direct contact with the welding protrusions on the bottom plate 27 is avoided. Therefore, the sealing cover 4 can stably mate with the first annular surface 231 of the positive electrode column 2, thereby facilitating a welded or adhesive seal between the sealing cover 4 and the positive electrode column 2.

[0052] Preferably, the positive electrode column 2 also includes a third groove 24. On a plane perpendicular to the thickness direction of the bottom plate 27, the cross-section of the third groove 24 is larger than the cross-section of the second groove 23. The third groove 24 is located above the second groove 23, and a second annular surface 241 is formed between the inner circumferential surface of the third groove 24 and the notch of the second groove 23.

[0053] By providing the second annular surface 241 , a larger placement space can be provided at the upper end of the sealing cover 4 , making it convenient to place the sealing cover 4 on the first annular surface 231 . At the same time, the second annular surface 241 can also avoid the welding gun to facilitate welding the sealing cover 4 to the positive electrode column 2 with the welding gun.

[0054] To facilitate welding of the sealing cover 4 and the positive electrode 2, preferably, the second annular surface 241 is flush with the end of the sealing cover 4 away from the battery cell 8. By flushing the second annular surface 241 with the upper end surface of the sealing cover 4, flat welding can be used, which is easier to weld.

[0055] It can be understood that the second annular surface 241 can also be slightly lower than the upper end face of the sealing cover 4. At this time, the outer peripheral surface of the sealing cover 4 and the second annular surface 241 form a welding angle. Since there is a second annular surface 241 that can avoid the welding gun, the welding gun can be tilted from the outside to the inside during welding and welded by fillet welding; the second annular surface 241 can also be slightly higher than the upper end face of the sealing cover 4. At this time, the inner peripheral surface of the second groove 23 and the upper end face of the sealing cover 4 form a welding angle. During welding, the welding gun can be tilted from the inside to the outside during welding and welded by fillet welding.

[0056] Preferably, the battery 100 further includes a steel cover 5 and plastic 6 , wherein the steel cover 5 is sleeved on the outer peripheral wall of the positive electrode column 2 , and at least a portion of the plastic 6 is filled between the outer peripheral wall of the positive electrode column 2 and the steel cover 5 .

[0057] By filling the plastic 6 between the positive electrode column 2 and the steel cover 5, not only can the positive electrode column 2 and the steel cover 5 be insulated to prevent the battery 100 from accidentally discharging through the steel cover 5, but the plastic 6 can also bond the positive electrode column 2 and the steel cover 5 into one, making it easier to assemble the battery.

[0058] Preferably, see Figure 2 and Figure 3 The positive electrode column 2 has a first end of the positive current collecting disc 1 , and an outer edge of the first end of the positive electrode column 2 is provided with a receiving groove 26 extending into the positive electrode column 2 , and the receiving groove 26 is suitable for receiving a portion of the insulating rubber sleeve 7 .

[0059] like Figures 2 to 5As shown, the insulating rubber sleeve 7 is in the shape of a hollow column. The upper end of the insulating rubber sleeve 7 has a rubber plate extending radially inward. The rubber plate is provided with an avoidance hole for avoiding the positive electrode column 2. The outer edge of the lower end of the positive electrode column 2 is provided with a receiving groove 26 extending into the positive electrode column 2. When the battery 100 is assembled, the rubber plate is located between the steel cover 5 and the positive current collecting disc 1, and the portion of the rubber plate close to the avoidance hole is located in the receiving groove 26 of the positive electrode column 2. As a result, the receiving groove 26 can limit the movement of the insulating rubber sleeve 7 relative to the positive electrode column 2 in the direction away from the battery cell 8. At the same time, the material of the insulating rubber sleeve 7 is lighter than that of the positive electrode column 2. After the positive electrode column 2 is provided with the receiving groove 26, the mass of the assembled battery 100 can be reduced.

[0060] Preferably, the positive electrode column 2 has a second end away from the positive current collecting disc 1, a step 25 is provided on the outer peripheral side of the second end of the positive electrode column 2, a groove is provided in the middle of the steel cover 5, a through hole is provided at the bottom of the groove that can be sleeved on the positive electrode column 2, the step 25, the groove and part of the insulating rubber sleeve 7 form an annular groove with a folded angle, and the annular groove is filled with plastic 6.

[0061] like Figure 2 and Figure 3 As shown, a step 25 is provided on the outer circumference of the upper end of the positive electrode post 2. A downward-facing groove is provided in the middle of the steel cover 5. A through-hole is provided at the bottom of the groove, which can be fitted over the outer circumference of the positive electrode post 2 to form an annular gap therewith. The inner circumferential wall of the groove and the bottom of the groove form a third annular surface with a folded angle. The third annular surface and the step 25 form an annular channel with a folded angle. Part of the rubber sheet of the insulating rubber sleeve 7 closes the lower portion of the annular channel, forming an annular groove with a folded angle. Plastic 6 can flow through the annular gap into the annular groove. Because the plastic 6 can contact multiple surfaces of the positive electrode post 2 and the steel cover 5, the solidified plastic 6 can relatively firmly bond the positive electrode post 2 and the steel cover 5.

[0062] Based on the above-mentioned battery 100 , the present invention further provides a vehicle. The vehicle of this embodiment includes a battery 100 , and the battery 100 is the battery 100 described above in this embodiment.

[0063] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and replacements can be made without departing from the technical principles of the present invention. These improvements and replacements should also be regarded as the scope of protection of the present invention.

Claims

1. A positive electrode column, characterized in that: include: A bottom surface (21) and a first groove (22) with an opening direction facing away from the bottom surface (21); the groove bottom of the first groove (22) and the bottom surface (21) form a bottom plate (27); and the bottom plate (27) is suitable for welding to the positive electrode collector plate (1).

2. The positive electrode column according to claim 1, characterized in that: The thickness of the bottom plate (27) is 0.5 to 2 times the thickness of the positive electrode current collecting disk (1).

3. A battery, characterized in that: It comprises a positive electrode current collecting plate (1) and a positive electrode column (2), wherein the positive electrode column (2) is According to the positive electrode column according to claim 1, the bottom plate (27) of the positive electrode column (2) is welded to the positive electrode current collecting plate (1).

4. The battery according to claim 3, characterized in that The positive electrode current collecting disc (1) and the bottom plate (27) are provided with a liquid injection hole for connecting the positive electrode current collecting disc (1) and the bottom plate (27); the cross section of the liquid injection hole at one end close to the positive electrode current collecting disc (1) is smaller than the cross section of the liquid injection hole at one end close to the positive electrode column (2); and the liquid injection hole is suitable for filling the sealing glue (3).

5. The battery according to claim 4, characterized in that It also comprises a sealing cover (4), which is arranged on one side of the bottom plate (27) close to the bottom of the first groove (22) to seal the liquid injection hole.

6. The battery according to claim 5, characterized in that The positive electrode column (2) further comprises a second groove (23); in a plane perpendicular to the thickness direction of the bottom plate (27), the cross section of the second groove (23) is larger than the cross section of the first groove (22); a first annular surface (231) is formed between the inner circumference of the second groove (23) and the notch of the first groove (22); and the sealing cover (4) is arranged on the first annular surface (231).

7. The battery according to claim 6, characterized in that The positive electrode column (2) further comprises a third groove (24); in a plane perpendicular to the thickness direction of the bottom plate (27), the cross section of the third groove (24) is larger than the cross section of the second groove (23); and a second annular surface (241) is formed between the inner circumferential surface of the third groove (24) and the notch of the second groove (23).

8. The battery according to claim 7, characterized in that The second annular surface (241) is flush with an end of the sealing cover (4) away from the battery core (8).

9. The battery according to any one of claims 3 to 8, characterized in that: It also includes a steel cover (5) and plastic (6), wherein the steel cover (5) is sleeved on the outer peripheral wall of the positive electrode column (2), and at least a portion of the plastic (6) is filled between the outer peripheral wall of the positive electrode column (2) and the steel cover (5).

10. A vehicle, characterized in that: It comprises a battery (100), wherein the battery (100) is a battery according to any one of claims 3 to 9.

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