Tab insulation sleeve and battery cell

Abstract

The utility model relates to a tab insulation sleeve and a battery cell. The tab insulation sleeve comprises a first extension part, a second extension part and a combination part, the first extension part and the second extension part are respectively arranged on two opposite sides of the combination part, a through groove is formed in the combination part, when the tab insulation sleeve is used, the through groove is arranged on a tab in a sleeving manner, and the first extension part and the second extension part cover at least one part of the bottom of the tab. The through groove is formed in the tab insulation sleeve, so that the tab can stably maintain the form after penetrating through the through groove under the auxiliary fixation of the first extension part and the second extension part and the constraint of the through groove, and the short-circuit risk of the pole group caused by the inverted insertion of the tab is reduced.

Description

TECHNICAL FIELD

[0001] The utility model mainly relates to new energy application field, especially about a tab insulation sleeve and the manufacture of electric core. BACKGROUND

[0002] With the continuous progress of new energy technology, energy storage technology plays an important role in improving energy utilization efficiency and achieving sustainable development. In this context, the size of the single cell can significantly reduce the system integration cost and the cost per kilowatt-hour, thereby improving the economy and efficiency of the energy storage system.

[0003] At present, more and more manufacturers have launched or are developing large-size cells with a single capacity greater than 500Ah. These large-size cells usually have a larger thickness and more tab layers to meet higher energy storage needs.

[0004] In the existing technology, the tabs of square large-size cells are usually insulated by insulating tape and collected by pre-welding. However, this traditional tab processing method has some problems, such as difficulty in controlling the shape of the tab, which can easily cause tab insertion reversal and lead to short circuit risk of the pole group. SUMMARY

[0005] The utility model aims to provide a tab insulation sleeve and an electric core, which solves the problem of difficulty in controlling the shape of the tab during the assembly process of the existing electric core, which can easily cause tab insertion reversal and lead to short circuit risk of the pole group.

[0006] To achieve the above-mentioned purpose, the utility model provides a tab insulation sleeve, which comprises a first extension, a second extension and a combination part.

[0007] The first extension and the second extension are respectively arranged on opposite sides of the combination part, and a through slot is formed on the combination part. When the tab insulation sleeve is used, the through slot is sleeved on the tab, and the first extension and the second extension cover at least a part of the bottom of the tab.

[0008] Further, in the tab insulation sleeve, the combination part comprises a first side wall, a second side wall and a top wall.

[0009] One end of the first side wall and the second side wall is respectively arranged on opposite sides of the top wall, the through slot is formed on the top wall, and the first extension and the second extension are respectively arranged on the other end of the first side wall and the second side wall and extend away from the top wall.

[0010] Further, in the tab insulation sleeve, the first extension and the second extension have an included angle between their extension lines, and the included angle is greater than 90 degrees and less than 180 degrees.

[0011] Further, in the tab insulation sleeve, the first extension and the second extension form an angle, and the width of the angle coverage area is less than or equal to the width of the pole group.

[0012] Further, in the tab insulation sleeve, the tab insulation sleeve is integrally formed.

[0013] Further, in the tab insulation sleeve, the tab insulation sleeve is made of insulating plastic material.

[0014] In a second aspect of the utility model, an electric core is also provided, which comprises a pole group, a connecting piece, an electric core cover plate and the tab insulation sleeve of the first aspect.

[0015] Further, in the electric core, the pole group comprises at least two pole groups, each of which is provided with a positive tab and a negative tab, and the positive tab and the negative tab are both provided with a tab insulation sleeve; the connecting piece comprises a positive connecting piece and a negative connecting piece, the positive connecting piece connects the positive tabs of all the pole groups, and the negative connecting piece connects the negative tabs of all the pole groups.

[0016] Further, in the electric core, a shell is further included; the pole group is installed in the shell, and the tab insulation sleeve realizes the isolation between the tab and the side wall of the shell.

[0017] Further, in the electric core, the tab is L-shaped and comprises a first part and a second part connected with each other, the first part is connected with the connecting piece, and the tab insulation sleeve is sleeved on the second part.

[0018] Compared with the prior art, the utility model has at least the following beneficial effects:

[0019] The utility model discloses a through groove for folding the tab is arranged on the tab insulation sleeve, so that the tab is stably maintained in the shape under the auxiliary fixing of the first extension and the second extension and the constraint of the through groove after passing through the through groove, and the risk of short circuit of the pole group caused by the reverse insertion of the tab is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is the structural schematic view of the tab insulation sleeve in an embodiment of the utility model;

[0021] Figure 2 It is the structural schematic view of the tab insulation sleeve not assembled on the pole group in an embodiment of the utility model;

[0022] Figure 3The structure schematic view of the insulating sleeve of the tab assembled on the pole group in an embodiment of the utility model;

[0023] Figure 4 The structure schematic view of the pole group, the insulating sleeve of the tab and the cell cover plate after assembly in an embodiment of the utility model;

[0024] Figure 5 The sectional view of the pole group, the insulating sleeve of the tab and the cell cover plate after assembly in an embodiment of the utility model;

[0025] Figure 6 The structure schematic view of the tab of the pole group and the connecting piece after ultrasonic welding in an embodiment of the utility model;

[0026] Figure 7 The side view of the tab of the pole group and the connecting piece after ultrasonic welding in an embodiment of the utility model;

[0027] Figure 8 The structure schematic view of the cell cover plate and the connecting piece after laser welding in an embodiment of the utility model;

[0028] Figure 9 The side view of the cell cover plate and the connecting piece after laser welding in an embodiment of the utility model;

[0029] Figure 10 The structure schematic view of the pole group after assembly and not completely assembled into the shell in an embodiment of the utility model;

[0030] Figure 11 The sectional view of the whole cell in an embodiment of the utility model.

[0031] 1, the insulating sleeve of the tab; 11, the first extension; 12, the second extension; 13, the joint; 131, the first side wall; 132, the second side wall; 133, the top wall; 1331, the through slot; 2, the pole group; 21, the tab; 201, the positive tab; 202, the negative tab; 3, the cell cover plate; 31, the pole; 4, the connecting piece; 401, the positive connecting piece; 402, the negative connecting piece; 51, the ultrasonic welding mark; 52, the laser welding mark; 6, the shell; 61, the first distance. DETAILED DESCRIPTION

[0032] The insulating sleeve of the tab and the cell will be described in more detail below with reference to the schematic view, wherein the preferred embodiment of the utility model is indicated, and it should be understood that the utility model described herein can be modified by the person skilled in the art, and the advantageous effects of the utility model are still achieved. Therefore, the following description should be understood as the extensive knowledge of the person skilled in the art, and not as the limitation of the utility model.

[0033] For clarity, not all of the features of an actual implementation are described in this document. In the following description, numerous specific details are set forth to provide an understanding of the present application. However, it will be apparent to one of ordinary skill in the art that the application can be practiced without these specific details. In other instances, well-known methods, procedures, components, and circuits have not been described in detail so as not to unnecessarily obscure aspects of the application.

[0034] The present application will now be described in more detail below with reference to the drawings. The advantages and features of the present application will become apparent from the following description, with reference to the drawings. It is to be noted, however, that the drawings illustrate only preferred embodiments of the application and therefore are not to be considered limiting of its scope, for the application will admit to other equally effective embodiments.

[0035] As mentioned in the background, the current tab of the battery cell is usually insulated by insulating tape and is collected by pre-welding. However, the tab is difficult to control in this way, which can easily cause the risk of short circuit of the pole group due to the inverted insertion of the tab.

[0036] Therefore, as shown in the Figures 1-5 The present embodiment provides a tab insulation sleeve 1, which comprises a first extension 11, a second extension 12 and a connecting part 13.

[0037] The first extension 11 and the second extension 12 are respectively arranged on opposite sides of the connecting part 13, and a through slot 1331 is formed on the connecting part 13. In use, the through slot 1331 is sleeved on the tab 21, and the first extension 11 and the second extension 12 cover at least part of the bottom of the tab 21.

[0038] For example, the first extension 11, the second extension 12 and the connecting part 13 can be integrally formed.

[0039] Specifically, the connecting part 13 comprises a first side wall 131, a second side wall 132 and a top wall 133. One end of the first side wall 131 and the second side wall 132 is respectively arranged on opposite sides of the top wall 133, and the through slot 1331 is formed on the top wall 133. The first extension 11 and the second extension 12 are respectively arranged at the other end of the first side wall 131 and the second side wall 132 and extend away from the top wall 133.

[0040] For example, the first side wall 131, the second side wall 132 and the top wall 133 can be integrally formed.

[0041] In the embodiment, the tab 21 is a part extending from the pole group 2, which is used as a bridge for connecting the internal electrode of the battery with the external circuit, and is responsible for collecting and conducting current. The tab insulation sleeve 1 is sleeved on the tab 21, which can keep the tab 21 insulated during the process of connecting with the external circuit. In addition, since the tab 21 is a part extending from the pole group 2, generally, the first extension part 11 and the second extension part 12 cover the upper surface of the pole group 2. When the tab insulation sleeve is used, the tab 21 extending out passes through the through groove 1331, and under the guidance of the first side wall 131 and the second side wall 132, the tab 21 can always keep a predetermined profile state, thereby avoiding the risk of short circuit of the pole group 2 caused by the tab 21 being inserted reversely.

[0042] In the embodiment, the height of the first side wall 131 of the tab insulation sleeve 1 is equal to the height of the second side wall 132, and the first side wall 131 and the second side wall 132 guide the tab 21 after penetrating into the through groove 1331, thereby making the tab 21 be able to be folded according to the guidance direction of the first side wall 131 and the second side wall 132.

[0043] Further, the length of the first extension part 11 is less than or equal to the length of the second extension part 12.

[0044] In the embodiment, the length of the first extension part 11 is less than the length of the second extension part 12. According to different requirements of different battery structures, the specific position of the tab 21 arranged on one side of the pole group 2 will also change, and therefore the length of the first extension part 11 and the second extension part 12 for covering the bottom of the tab 21 will also change accordingly. In the embodiment, the length of the first extension part 11 is less than the length of the second extension part 12. However, with the change of the setting position of the tab 21, in certain cases, the length of the first extension part 11 can also be greater than or equal to the length of the second extension part 12, so as to better cover the shape of the bottom of the tab 21.

[0045] Further, in the tab insulation sleeve 1, the first extension part 11 and the second extension part 12 have an included angle between the extension lines thereof, and the included angle ranges from greater than 90 degrees to less than 180 degrees. Since the tab 21 is a part extending from the pole group 2, when the tab insulation sleeve 1 is sleeved on the tab 21, the bottom of the tab 21 can be in a state of being attached to the first extension part 11 and the second extension part 12, or in a state of leaving a predetermined gap between the first extension part 11 and the second extension part 12. In addition, with the change of the setting position of the tab 21, the included angle between the extension lines of the first extension part 11 and the second extension part 12 should be kept in a range from greater than 90 degrees to less than 180 degrees, so as to make the tab insulation sleeve 1 profile the tab 21 under the premise of avoiding the risk of short circuit of the pole group 2 caused by the tab 21 being inserted reversely.

[0046] Further, the first extension part 11 and the second extension part 12 cover an angle with a width less than or equal to the width of the pole group, i.e. the width of the pole lug insulation sleeve, effectively avoiding cantilever effect, making the stress distribution at the connection more uniform, reducing the risk of local overload, and prolonging the service life of the pole lug insulation sleeve.

[0047] In the embodiment, the material of the pole lug insulation sleeve 1 is an insulating plastic material. The insulating plastic material has a very high resistivity and excellent electrical insulation performance, which can effectively prevent current leakage and ensure the safe use of the battery cell. The insulating plastic material generally has good mechanical strength and toughness, which can protect the pole lug from physical damage and improve the durability of the battery cell. The insulating plastic material is easy to process and shape, and can be made into the required shape and size through simple process, which is suitable for mass production. Compared with metal or other materials, the insulating plastic material generally has lower cost, which helps to reduce the production cost of the battery cell.

[0048] In addition, further in combination with Figures 10-11 As shown in the another embodiment of the utility model, a battery cell is provided, which comprises pole groups 2, connecting pieces 4, a battery cell cover plate 3 and the above-mentioned pole lug insulation sleeve 1; the pole lug insulation sleeve 1 is sleeved on the pole lug 21 of the pole group 2, and the connecting piece 4 realizes the connection of the pole lug 21 between adjacent pole groups 2 and is connected with the pole 31 of the battery cell cover plate 3.

[0049] Further, referring to Figures 6-9 As shown in the battery cell, the pole group comprises at least two, each of the pole groups is provided with a positive pole lug 201 and a negative pole lug 202, and the positive pole lug 201 and the negative pole lug 202 are both sleeved with the pole lug insulation sleeve 1. The connecting piece 4 comprises a positive connecting piece 401 and a negative connecting piece 402, the positive connecting piece 401 connects the positive pole lug 201 of all the pole groups, and the negative connecting piece 402 connects the negative pole lug 202 of all the pole groups.

[0050] In the embodiment, the battery cell comprises two pole groups arranged side by side, each of the pole groups is provided with a positive pole lug 201 and a negative pole lug 202, the positive pole lug 201 and the negative pole lug 202 are arranged at a distance, and the positive pole lug 201 and the negative pole lug 202 are both sleeved with the pole lug insulation sleeve 1. In addition, the connecting piece 4 comprises a positive connecting piece 401 and a negative connecting piece 402, the positive connecting piece 401 and the negative connecting piece 402 maintain a predetermined distance. One positive connecting piece 401 can connect the positive pole lug 201 in two pole groups, and one negative connecting piece 402 can connect the negative pole lug 202 in two pole groups.

[0051] Further, the battery cell further comprises a shell 6, the pole group is installed in the shell 6, and the tab insulation sleeve 1 realizes isolation between the tab 21 and the side wall of the shell 6.

[0052] Specifically, two pole groups in the battery cell are combined, as shown in Figure 10 and Figure 11 two combined pole groups are installed in the shell 6, the tab 21 has a first distance 61 from the side wall of the shell 6, the first distance 61 is indicated by a red line in Figure 11 , and the first distance 61 helps to maintain a safe distance between the tab 21 and the shell 6, realizes isolation between the tab 21 and the side wall of the shell 6, and reduces the risk of short circuit caused by contact between the tab 21 and the shell 6. In addition, the tab 21 is L-shaped and comprises a first part and a second part connected to each other, the first part is connected to the connecting piece 4, and the tab insulation sleeve 1 is sleeved on the second part.

[0053] In an embodiment, as shown in Figure 6 and Figure 7 the connection between the tab 21 and the connecting piece 4 adopts ultrasonic welding, and an ultrasonic welding mark 51 is generated on the tab 21. The ultrasonic welding technology not only has good adaptability in the connection process of metal and plastic and the like, but also can accurately control the welding position and the welding strength, and the deformation and damage of the material are small in the welding process.

[0054] In an embodiment, as shown in Figure 8 and Figure 9 the connecting piece 4 is laser welded with the pole column on the battery cell cover plate 3, and a laser welding mark 52 is generated on the connecting piece 4. Laser welding can realize very fine welding seams, is particularly suitable for welding of small or hard-to-access parts, the heat-affected zone of laser welding is relatively small, which helps to reduce the thermal damage to the surrounding material and maintain the original performance of the material.

[0055] In summary, in the tab insulation sleeve and the battery cell provided in the embodiment of the utility model, the through groove is formed on the tab insulation sleeve, so that the tab is stably maintained in a stable state under the auxiliary fixation of the first extension part and the second extension part and the constraint of the through groove after the tab passes through the through groove, and the risk of short circuit of the pole group caused by reverse insertion of the tab is reduced.

[0056] The above is only the preferred embodiment of the utility model, and does not limit the utility model in any way. Any person skilled in the art, without departing from the technical solution of the utility model, makes any form of equivalent replacement or modification of the technical solution and technical content disclosed by the utility model, and the like, which belongs to the content of the technical solution of the utility model, and still belongs to the protection scope of the utility model.

Claims

1. A tab insulation sleeve, characterized by, The first extension part and the second extension part are respectively arranged on opposite sides of the connecting part, a through groove is arranged on the connecting part, the through groove is sleeved on the tab in use, and the first extension part and the second extension part cover at least part of the bottom of the tab. The connecting part comprises a first side wall, a second side wall and a top wall.

2. The tab insulation sleeve of claim 1, wherein, One end of the first side wall and the second side wall is respectively arranged on opposite sides of the top wall, the through groove is arranged on the top wall, and the first extension part and the second extension part are respectively arranged on the other end of the first side wall and the second side wall and extend away from the top wall. The first extension part and the second extension part have an included angle between the extensions thereof, the included angle ranges from greater than 90 degrees to less than 180 degrees.

3. The tab insulation sleeve of claim 2, wherein, The width of the included angle coverage area of the first extension part and the second extension part is less than or equal to the width of the pole group.

4. The tab insulation sleeve of claim 3, wherein, The tab insulation sleeve is integrally formed.

5. The tab insulation sleeve of claim 1, wherein, The tab insulation sleeve is made of insulating plastic material.

6. The tab insulation sleeve of claim 1, wherein, The pole group, the connecting sheet, the cell cover plate and the tab insulation sleeve as claimed in any one of claims 1-6 are included, the tab insulation sleeve is sleeved on the tab of the pole group, the connecting sheet connects the tabs between adjacent pole groups, and the connecting sheet is connected with the pole of the cell cover plate.

7. An electric cell characterized by The pole group comprises at least two pole groups, each of the pole groups is provided with a positive tab and a negative tab, and the positive tab and the negative tab are both sleeved with the tab insulation sleeve; the connecting sheet comprises a positive connecting sheet and a negative connecting sheet, the positive connecting sheet connects the positive tabs of all the pole groups, and the negative connecting sheet connects the negative tabs of all the pole groups.

8. The electric cell of claim 7, wherein, The pole group is installed in the shell, and the tab insulation sleeve isolates the tab from the side wall of the shell.

9. The electric cell of claim 8, wherein, The tab is L-shaped and comprises a first part and a second part connected with each other, the first part is connected with the connecting sheet, and the tab insulation sleeve is sleeved on the second part.

10. The electric cell of claim 8, wherein, ​

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