Tab structure, battery module and soft package battery

Abstract

The utility model relates to the technical field of batteries, in particular to a tab structure, a battery module and a soft package battery. The tab structure comprises a tab sleeve, a first hard tab and a second hard tab, a first mounting hole and a second mounting hole are formed in the tab sleeve, the first mounting hole and the second mounting hole are correspondingly arranged at a preset interval, the first hard tab is arranged in the first mounting hole and extends outwards along the two ends of the tab sleeve, and the second hard tab is arranged in the second mounting hole and extends outwards along the two ends of the tab sleeve. The second hard tab is arranged in the second mounting hole and extends outwards along the two ends of the tab sleeve, and the extension directions of the first hard tab and the second hard tab on the tab sleeve correspond to each other. After the tab structure is connected with the positive plate and the negative plate of the battery module, the correspondence between the first hard tab and the second hard tab can be ensured, and the production qualification rate of the soft package battery is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a tab structure, a battery module and a soft-pack battery. Background Art

[0002] Soft-pack batteries use soft aluminum-plastic film as outer packaging. Compared with traditional hard-shell batteries, they are lighter, thinner and more flexible. They are widely used in electric vehicles, portable electronic devices and other fields with high requirements on volume and weight.

[0003] On the semi-automatic multi-electrode tab battery cell production line, when the positive and negative electrode sheets of the battery cell are transferred to the hard tabs, the positive and negative hard tabs need to be clamped and fixed twice and then welded to the positive and negative electrode sheets of the battery cell respectively. After the positive and negative hard tabs are connected, the tab correspondence is poor, which leads to a significant drop in the qualified rate of the manufactured soft-pack batteries. Utility Model Content

[0004] The technical problem to be solved by the embodiments of the utility model is to provide a tab structure, a battery module and a soft-pack battery to solve the problem in the prior art that after the positive and negative hard tabs are connected to the positive and negative electrodes of the battery cell, the tab spacing consistency is low and the tabs are skewed, which leads to a significant decrease in the qualified rate of the soft-pack battery.

[0005] The utility model discloses a pole ear structure, comprising: a pole ear sleeve, a first hard pole ear and a second hard pole ear, wherein a first mounting hole and a second mounting hole are formed on the pole ear sleeve, the first mounting hole and the second mounting hole are arranged in parallel with a preset spacing, the first hard pole ear is arranged in the first mounting hole and extends outward along the two ends of the pole ear sleeve, the second hard pole ear is arranged in the second mounting hole and extends outward along the two ends of the pole ear sleeve, and the extension directions of the first hard pole ear and the second hard pole ear on the pole ear sleeve are parallel to each other.

[0006] Optionally, the first mounting hole and the second mounting hole are located on the same horizontal plane.

[0007] Optionally, along the extension direction of the first hard pole tab and the second hard pole tab, the first hard pole tab can be slidably disposed in the first mounting hole, and the second hard pole tab can be slidably disposed in the second mounting hole.

[0008] Optionally, the cross-sections of the first mounting hole and the second mounting hole in the height direction of the tab sleeve are rectangular structures.

[0009] Optionally, the tab sleeve is made of elastic material.

[0010] Optionally, the tab structure is a symmetrical structure.

[0011] Optionally, first pole lug glue is correspondingly arranged on both side surfaces of the first hard pole lug, and second pole lug glue is correspondingly arranged on both side surfaces of the second hard pole lug.

[0012] The utility model also discloses a battery module, comprising a battery cell and the above-mentioned pole ear structure, wherein the battery cell is provided with a positive electrode sheet and a negative electrode sheet, the first hard pole ear is connected to the positive electrode sheet, and the second hard pole ear is connected to the negative electrode sheet.

[0013] Optionally, the first hard pole tab is welded to the positive electrode sheet, and the second hard pole tab is welded to the negative electrode sheet.

[0014] The utility model also discloses a soft-pack battery, comprising the battery module described above.

[0015] Compared with the prior art, the beneficial effects of the pole ear structure, battery module and soft-pack battery provided by the embodiments of the utility model are: the correspondence of the connection between the first hard pole ear and the second hard pole ear is achieved by arranging the first hard pole ear and the second hard pole ear on the pole ear sleeve. Specifically, a first mounting hole and a second mounting hole are formed on the pole ear sleeve, and the first mounting hole and the second mounting hole are arranged correspondingly with a preset spacing. The first hard pole ear is arranged in the first mounting hole and extends outward along the two ends of the pole ear sleeve, and the second hard pole ear is arranged in the second mounting hole and extends outward along the two ends of the pole ear sleeve, so as to achieve the purpose of positioning the first hard pole ear and the second hard pole ear, and realize the corresponding arrangement of the first hard pole ear and the second hard pole ear on the pole ear sleeve. After the above-mentioned pole ear structure is correspondingly connected to the positive electrode sheet and the negative electrode sheet of the battery cell, the correspondence between the first hard pole ear and the second hard pole ear can be guaranteed, thereby improving the production qualification rate of the soft-pack battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The technical solution of the utility model will be further described in detail below with reference to the accompanying drawings and embodiments, in which:

[0017] Figure 1 It is a schematic diagram of the tab structure provided by an embodiment of the utility model;

[0018] Figure 2 It is a side view of a tab sleeve provided by an embodiment of the utility model;

[0019] Figure 3 It is a schematic diagram of the connection structure between the tab structure and the battery module provided in an embodiment of the utility model.

[0020] The reference numerals in the figures are:

[0021] 10. Tab sleeve; 101. first mounting hole; 102. second mounting hole; 20. first hard tab; 210. first tab glue; 30. second hard tab; 310. second tab glue; 40. battery cell; 410. positive electrode sheet; 420. negative electrode sheet. DETAILED DESCRIPTION

[0022] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. Now, in conjunction with the accompanying drawings, a preferred embodiment of the present utility model is described in detail.

[0023] The utility model embodiment provides a tab structure, such as Figure 1 and Figure 2 As shown, it includes: a pole lug sleeve 10, a first hard pole lug 20 and a second hard pole lug 30. A first mounting hole 101 and a second mounting hole 102 are formed on the pole lug sleeve 10. The first mounting hole 101 and the second mounting hole 102 are arranged correspondingly to each other at a preset interval. The first hard pole lug 20 is arranged in the first mounting hole 101 and extends outward along both ends of the pole lug sleeve 10. The second hard pole lug 30 is arranged in the second mounting hole 102 and extends outward along both ends of the pole lug sleeve 10. The extension directions of the first hard pole lug 20 and the second hard pole lug 30 on the pole lug sleeve 10 correspond to each other.

[0024] The pole lug structure of this embodiment realizes the correspondence of the connection between the first hard pole lug 20 and the second hard pole lug 30 by arranging the first hard pole lug 20 and the second hard pole lug 30 on the pole lug sleeve 10. Specifically, a first mounting hole 101 and a second mounting hole 102 are formed on the pole lug sleeve 10, and the first mounting hole 101 and the second mounting hole 102 are correspondingly arranged with a preset interval. The first hard pole lug 20 is arranged in the first mounting hole 101 and extends outward along the two ends of the pole lug sleeve 10, and the second hard pole lug 30 is arranged in the second mounting hole 102 and extends outward along the two ends of the pole lug sleeve 10, so as to achieve the purpose of positioning the first hard pole lug 20 and the second hard pole lug 30, and realize the corresponding arrangement of the first hard pole lug 20 and the second hard pole lug 30 on the pole lug sleeve 10. After the above-mentioned pole lug structure is correspondingly connected to the positive electrode sheet 410 and the negative electrode sheet 420 of the battery cell 40, the correspondence between the first hard pole lug 20 and the second hard pole lug 30 can be guaranteed, thereby improving the production qualification rate of the soft-pack battery.

[0025] The preset distance between the first mounting hole 101 and the second mounting hole 102 can be adjusted according to the distance between the positive electrode sheet 410 and the negative electrode sheet 420 of the battery cell 40, which is not specifically limited here.

[0026] As a preferred solution of this embodiment, the first mounting hole 101 and the second mounting hole 102 are arranged in parallel with each other with a preset interval, and the extension directions of the first hard pole tab 20 and the second hard pole tab 30 on the pole tab sleeve 10 are parallel to each other.

[0027] Among them, the parallel setting of the above-mentioned first mounting hole 101 and the second mounting hole 102 enables the first hard pole ear 20 and the second hard pole ear 30 to be set in parallel, ensuring the consistency of the distance between the first hard pole ear 20 and the second hard pole ear 30, avoiding the first hard pole ear 20 and the second hard pole ear 30 from being skewed, and once again improving the production qualification rate of soft-pack batteries.

[0028] Reference Figure 1 After the tab structure of this embodiment is connected to the battery cell 40 , the tab center distance L between the first hard tab 20 and the second hard tab 30 is consistent with the tab center distance between the positive electrode sheet 410 and the negative electrode sheet 420 of the battery cell 40 .

[0029] As a preferred solution of this embodiment, refer to Figure 2 , the first mounting hole 101 and the second mounting hole 102 are located on the same horizontal plane.

[0030] Among them, the setting of the above-mentioned first mounting hole 101 and the second mounting hole 102 facilitates the installation and setting of the first hard pole ear 20 and the second hard pole ear 30, and improves the operability and convenience of connecting the pole ear structure with the positive electrode sheet 410 and the negative electrode sheet 420 of the battery cell 40, thereby improving the consistency of the spacing between the first hard pole ear 20 and the second hard pole ear 30 after connection, preventing the pole ears from skewing again, and improving the production qualification rate of soft-pack batteries.

[0031] As a preferred solution of this embodiment, refer to Figure 1 Along the extension direction of the first hard pole tab 20 and the second hard pole tab 30 , the first hard pole tab 20 is slidably disposed in the first mounting hole 101 , and the second hard pole tab 30 is slidably disposed in the second mounting hole 102 .

[0032] Among them, the first hard pole ear 20 and the second hard pole ear 30 are set to slide on the pole ear sleeve 10, which can adjust the positions of the first hard pole ear 20 and the second hard pole ear 30 on the pole ear sleeve 10, so as to adjust the connection point between the first hard pole ear 20 and the positive electrode sheet 410 of the battery cell 40 and the connection point between the second hard pole ear 30 and the negative electrode sheet 420 of the battery cell 40 according to actual connection requirements, thereby improving the adaptability of the connection between the pole ear structure and the battery cell 40.

[0033] As a preferred solution of this embodiment, refer to Figure 2 The cross-sections of the first mounting hole 101 and the second mounting hole 102 in the height direction of the tab sleeve 10 are rectangular structures.

[0034] Among them, the structural setting of the above-mentioned first mounting hole 101 and the second mounting hole 102 is used to match the first hard pole ear 20 and the second hard pole ear 30, improve the setting stability of the first hard pole ear 20 and the second hard pole ear 30 on the pole ear sleeve 10, and then ensure the stability of the pole ear structure when connected to the battery cell 40, improve the consistency of the distance between the first hard pole ear 20 and the second hard pole ear 30 after the pole ear structure is connected to the battery cell 40, and again avoid the phenomenon of pole ear skewness, thereby improving the production qualification rate of soft-pack batteries.

[0035] Reference Figure 2 , the Z direction is the height direction of the tab sleeve 10 .

[0036] As a preferred solution of this embodiment, the tab sleeve 10 is made of elastic material.

[0037] Among them, the pole lug sleeve 10 made of elastic material can be stretched along its length direction so that the lengths of the first mounting hole 101 and the second mounting hole 102 become correspondingly larger. At this time, when the first hard pole lug 20 and the second hard pole lug 30 are arranged on the pole lug sleeve 10, it can prevent the first hard pole lug 20 and the second hard pole lug 30 from contacting and rubbing with the pole lug sleeve 10, reduce the wear of the first hard pole lug 20 and the second hard pole lug 30 themselves, and improve the production qualification rate of the soft-pack battery. When the first hard pole lug 20 and the second hard pole lug 30 are installed in place, the stretching force is removed to fix the first hard pole lug 20 and the second hard pole lug 30 on the pole lug sleeve 10.

[0038] Reference Figure 2 , the X direction is the height direction of the tab sleeve 10 .

[0039] As a preferred solution of this embodiment, refer to Figure 1 and Figure 2 , the ear structure is a symmetrical structure.

[0040] Among them, the setting of the above-mentioned symmetrical structure can improve the applicability of the pole ear structure. When correspondingly connecting with the positive electrode sheet 410 and the negative electrode sheet 420 of the battery cell 40, there is no need to deliberately distinguish the one-to-one correspondence between the first hard pole ear 20 and the second hard pole ear 30, thereby improving the connection efficiency between the pole ear structure and the battery cell; at the same time, it can also improve the uniformity of the force on the pole ear structure itself, thereby improving its own structural stability, ensuring the stability of the pole ear structure when connected to the battery cell 40, and further improving the consistency of the distance between the first hard pole ear 20 and the second hard pole ear 30 after the pole ear structure is connected to the battery cell 40, avoiding the occurrence of pole ear skewness, and improving the production qualification rate of soft-pack batteries.

[0041] As a preferred solution of this embodiment, first tab glue 210 is correspondingly disposed on both side surfaces of the first hard tab 20 , and second tab glue 310 is correspondingly disposed on both side surfaces of the second hard tab 30 .

[0042] The first pole tab glue 210 and the second pole tab glue 310 are used to isolate the first hard pole tab 20 and the second hard pole tab 30 to prevent short circuit and ensure the normal operation and safety of the circuit of the battery cell 40 .

[0043] The present application also discloses a battery module, referring to Figure 3 , including a battery cell 40 and the tab structure in the aforementioned embodiment, the battery cell 40 is provided with a positive electrode sheet 410 and a negative electrode sheet 420, the first hard tab 20 is connected to the positive electrode sheet 410, and the second hard tab 30 is connected to the negative electrode sheet 420. The battery module includes the same structure and beneficial effects as the tab structure in the aforementioned embodiment. The structure and beneficial effects of the tab structure have been described in detail in the aforementioned embodiment, and will not be repeated here.

[0044] As a preferred solution of this embodiment, the first hard pole tab 20 is welded to the positive electrode sheet 410 , and the second hard pole tab 30 is welded to the negative electrode sheet 420 .

[0045] Among them, welding can form a solid metal bond at the connection point, provide a high-strength connection, and ensure the connection strength between the first hard pole ear 20 and the second hard pole ear 30 and the battery cell 40; the welding connection is usually permanent, and the connection point is not easy to loosen or fall off, providing a long-lasting connection; the welding connection can provide excellent electrical conductivity and ensure good current transmission; at the same time, the welding connection can remain stable in a high temperature environment, has good high temperature resistance, and can adapt to the heat generated by the battery module during the charging and discharging process.

[0046] The present application also discloses a soft-pack battery, including the tab structure in the above embodiment, and the soft-pack battery has the same structure and beneficial effects as the tab structure in the above embodiment. The structure and beneficial effects of the tab structure have been described in detail in the above embodiment, and will not be repeated here.

[0047] It should be understood that the above embodiments are only used to illustrate the technical solutions of the present utility model rather than to limit it. For those skilled in the art, the technical solutions described in the above embodiments can be modified, or some of the technical features therein can be replaced by equivalents; and all these modifications and replacements should fall within the scope of protection of the claims attached to the present utility model.

Claims

1. A tab structure, characterized in that: include: A pole lug sleeve, a first hard pole lug and a second hard pole lug, wherein a first mounting hole and a second mounting hole are formed on the pole lug sleeve, the first mounting hole and the second mounting hole are arranged correspondingly with a preset interval, the first hard pole lug is arranged in the first mounting hole and extends outward along both ends of the pole lug sleeve, the second hard pole lug is arranged in the second mounting hole and extends outward along both ends of the pole lug sleeve, and the extension directions of the first hard pole lug and the second hard pole lug on the pole lug sleeve correspond to each other.

2. The tab structure according to claim 1, characterized in that: The first mounting hole and the second mounting hole are arranged in parallel with each other with a preset interval, and the extension directions of the first hard pole tab and the second hard pole tab on the pole tab sleeve are parallel to each other.

3. The tab structure according to claim 1, characterized in that: The first mounting hole and the second mounting hole are located on the same horizontal plane.

4. The tab structure according to claim 1, characterized in that: Along the extension direction of the first hard pole tab and the second hard pole tab, the first hard pole tab is slidably disposed in the first mounting hole, and the second hard pole tab is slidably disposed in the second mounting hole.

5. The tab structure according to claim 1, characterized in that: The cross-section of the first mounting hole and the second mounting hole in the height direction of the tab sleeve is a rectangular structure.

6. The tab structure according to claim 1, characterized in that: The pole lug sleeve is made of elastic material.

7. The tab structure according to claim 1, characterized in that: The pole ear structure is a symmetrical structure.

8. The tab structure according to claim 1, characterized in that: The first pole lug glue is correspondingly arranged on both side surfaces of the first hard pole lug, and the second pole lug glue is correspondingly arranged on both side surfaces of the second hard pole lug.

9. A battery module, characterized in that: It comprises a battery cell and the tab structure according to any one of claims 1 to 8, wherein a positive electrode sheet and a negative electrode sheet are arranged on the battery cell, the first hard tab is connected to the positive electrode sheet, and the second hard tab is connected to the negative electrode sheet.

10. A soft pack battery, characterized in that: Comprising the battery module as claimed in claim 9.

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