Tab electric connection structure and square battery cell

Abstract

The utility model relates to the technical field of batteries, and provides a tab electric connection structure and a square battery cell, the tab electric connection structure comprises a shell, a cover plate, a battery cell, a tab and a hot melting ring, the cover plate seals the opening of the shell; the battery cell is arranged in the shell; the tab is electrically connected with the battery cell and penetrates through the cover plate; the hot melting ring is arranged on the cover plate and surrounds the tab; according to the battery, the hot melting ring is arranged on the cover plate, so that after the tab penetrates through the cover plate, the hot melting ring can be melted in a heating manner to be in contact with the tab and the cover plate, effective sealing between the tab and the cover plate is realized, the air tightness of the position, penetrating through the cover plate, of the tab is greatly improved, and the performance of the battery is ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field especially relates to a tab electric connection structure and square electric core. BACKGROUND

[0002] With the development of new energy vehicles, batteries are not only applied to traditional electronic devices and energy storage components, the demand of electric vehicles for battery performance greatly promotes the development of battery related technologies, the structure improvement of the current battery, whether in structure or process, basically revolves around the improvement of battery energy density and safety performance.

[0003] The utility model discloses a battery top cover structure without pole, including top cover plate, sealing washer and the tab generated in the winding process of electric core, the top cover plate has through -hole, and the through -hole is from top to bottom through the top cover plate, and the tab extends from the inside of the battery upwards and passes through the through -hole and is electrically connected with the external circuit, and the through -hole is filled with sealing washer between the tab.

[0004] As in the above technical scheme, the tab is sealed by the sealing washer, which is the sealing method of the conventional battery pole, but the structural strength of the tab is poorer than that of the pole, which leads to the sealing effect of the tab through the sealing ring after passing through the top cover plate is not ideal, and the air tightness is poor, so the existing sealing structure needs to be improved. UTILITY MODEL CONTENTS

[0005] Therefore, the utility model provides a tab electric connection structure and square electric core with good sealing performance, thereby solving the problem of poor sealing structure effect of the existing tab.

[0006] The technical scheme of the utility model is realized as follows:

[0007] On the one hand, the utility model provides a tab electric connection structure, including shell, cover plate, electric core, tab and hot melting ring, wherein,

[0008] One side of the shell is open;

[0009] The cover plate seals the opening of the shell;

[0010] The electric core is arranged in the shell;

[0011] The tab is electrically connected with the electric core and penetrates through the cover plate;

[0012] The hot melting ring is arranged on the cover plate and surrounds the tab.

[0013] On the basis of the above technical scheme, preferably, the tab is a laminated tab.

[0014] On the basis of the above technical scheme, preferably, the hot melting ring and the cover plate are in an integrated structure.

[0015] On the basis of the above technical scheme, preferably, the hot melting ring protrudes towards the side of the cover plate away from the shell.

[0016] On the basis of the above technical scheme, preferably, the cover plate and the hot melting ring are provided with a through hole, and the through hole is in a trapezoidal shape, and the flared end of the through hole faces the shell.

[0017] On the basis of the above technical scheme, preferably, the tab is divided into a first tab and a second tab, wherein,

[0018] The first tab is a positive electrode tab;

[0019] The second tab is a negative electrode tab;

[0020] The first tab and the second tab are both electrically connected with the battery cell and penetrate the cover plate.

[0021] On the basis of the above technical scheme, preferably, the first tab and the second tab are each provided with at least two pieces.

[0022] On the basis of the above technical scheme, preferably, the first tab and the second tab each include a connecting portion and an extending portion, wherein,

[0023] The connecting portion is electrically connected with the battery cell;

[0024] The extending portion is connected with the connecting portion and penetrates the cover plate.

[0025] On the basis of the above technical scheme, preferably, the extending portions of the two pieces of the first tab are connected, and the extending portions of the two pieces of the second tab are connected.

[0026] On the basis of the above technical scheme, preferably, the first tab and the second tab are each provided with at least two pieces.

[0027] The tab electrical connection structure and the square battery cell have the following beneficial effects compared with the prior art:

[0028] (1) By providing the hot melting ring on the cover plate, the hot melting ring can be melted by heating after the tab penetrates the cover plate, so as to contact the tab and the cover plate, realize effective sealing between the tab and the cover plate, greatly improve the air tightness of the position where the tab penetrates the cover plate, and thus ensure the performance of the battery;

[0029] (2) By setting the cover plate and the hot melting ring in an integrated structure, the hot melting ring has good connection strength with the cover plate after being melted;

[0030] (3) Two first and two second electrodes are provided, so that the cover plate can be passed through four through holes. This reduces the cross-sectional area of ​​the through holes, which is beneficial to further improve the sealing effect after the hot melt ring melts. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is a perspective view of the electrode electrical connection structure of this utility model;

[0033] Figure 2 This is an exploded view of the electrode electrical connection structure of this utility model;

[0034] Figure 3 This is a front view of the electrode electrical connection structure of this utility model;

[0035] Figure 4 For the present utility model Figure 3 Sectional view along the AA direction;

[0036] Figure 5 For the present utility model Figure 4 Enlarged view of the structure at point A in the middle;

[0037] In the diagram: 1. Shell; 2. Cover plate; 201. Through hole; 3. Battery cell; 4. Electrode; 41. First electrode; 42. Second electrode; 411. Connecting part; 412. Extension part; 5. Thermocouple. Detailed Implementation

[0038] The technical solutions of this utility model will be clearly and completely described below with reference to the embodiments of this utility model. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of the embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0039] like Figures 1-5 As shown, the electrode electrical connection structure of this utility model includes a housing 1, a cover plate 2, a battery cell 3, an electrode 4, and a thermocouple 5.

[0040] like Figures 1-3As shown, one side of the housing 1 is open; the cover plate 2 seals the opening of the housing 1; the battery cell 3 is disposed inside the housing 1; the electrode tab 4 is electrically connected to the battery cell 3 and passes through the cover plate 2; the hot melt ring 5 is disposed on the cover plate 2 and surrounds the electrode tab 4.

[0041] As described above, the opening of the housing 1 is used to house the battery cell 3. Then, the tabs 4 on the battery cell 3 are passed through the cover plate 2, and the cover plate 2 is then sealed to the housing 1.

[0042] The hot-melt ring 5 surrounds the tab 4. After the tab 4 passes through, the hot-melt ring 5 is melted by hot-melt. The melted material of the hot-melt ring 5 will adhere tightly to the cover plate 2 and the tab 4, thereby ensuring a good sealing effect and helping to ensure the overall airtightness of the battery.

[0043] Specifically, electrode 4 is a stacked electrode;

[0044] As described above, the battery cell 3 is formed by stacking positive and negative electrode sheets and a separator, while the tab 4 is formed by cutting the edge of the electrode sheet. This forms a stacked tab. Although there may be tiny gaps at the edges of the stacked tab, they can be well filled by the melting of the hot-melt ring 5 to avoid leakage.

[0045] Furthermore, the hot melt ring 5 and the cover plate 2 are an integral structure;

[0046] As described above, by setting the cover plate 2 and the hot melt ring 5 as an integral structure, the hot melt ring 5 has good connection strength with the cover plate 2 after melting, so as to significantly improve the sealing effect.

[0047] Furthermore, the hot melt ring 5 protrudes toward the side of the cover plate 2 away from the shell 1; this facilitates the heating and melting process.

[0048] like Figure 5 As shown, through holes 201 are provided in the cover plate 2 and the hot melt ring 5, and the cross-section of the through hole 201 is trapezoidal, with the flared end of the through hole 201 facing into the housing 1.

[0049] As described above, the cross-section of the through hole 201 on the cover plate 2 is set to a trapezoidal shape. When the electrode 4 passes through the through hole 201, the electrode 4 can enter through the flared end of the through hole 201 and extend through the constricted end. This allows the electrode 4 to be gathered, and after the hot melt ring 5 melts, it can also be better bonded and sealed.

[0050] like Figure 1 As shown, the electrode 4 is divided into a first electrode 41 and a second electrode 42, wherein the first electrode 41 is the positive electrode and the second electrode 42 is the negative electrode; both the first electrode 41 and the second electrode 42 are electrically connected to the battery cell 3 and penetrate the cover plate 2.

[0051] As the above structure, the tab 4 is divided into a first tab 41 and a second tab 42, and is used as a positive electrode tab and a negative electrode tab respectively;

[0052] The hot melt ring 5 is used for sealing of the first tab 41 and / or sealing of the second tab 42.

[0053] As shown in the drawings, the first tab 41 and the second tab 42 are each provided with at least two pieces; Figures 1-3

[0054] As the above structure, the first tab 41 and the second tab 42 are each provided with two pieces, so that the four through holes 201 can pass through the cover plate 2, which reduces the cross-sectional area of the through hole 201 and is beneficial to further improve the sealing effect of the hot melt ring 5 after melting

[0055] As shown in the drawings, the first tab 41 and the second tab 42 each include a connecting portion 411 and an extension portion 412, wherein the connecting portion 411 is electrically connected with the battery cell 3; the extension portion 412 is connected with the connecting portion 411 and penetrates the cover plate 2; Figure 1

[0056] As the above structure, the first tab 41 and the second tab 42, the part located in the shell 1 is the connecting portion 411, and the part extending to the outside is the extension portion 412, wherein the extension portion 412 is used as a pole and directly charges and discharges.

[0057] Further, the extension portions 412 of the two pieces of the first tab 41 are connected, and the extension portions 412 of the two pieces of the second tab 42 are connected;

[0058] As the above structure, when applied, the two extension portions 412 of adjacent and same polarity are connected, and then the bus bar is connected, which can ensure the stability of the relative position of the tab 4 and the cover plate 2 and is beneficial to further ensure the stability of the electrical connection.

[0059] The square battery cell of the utility model includes the tab electrical connection structure.

[0060] The square battery cell, the tab extends to the outside, so that welding is facilitated, the problem of incomplete welding can be effectively prevented; at the same time, the tab replaces the pole of the battery cell, solves the problems of virtual welding and missing welding between the pole and the pole piece, saves the welding process flow, realizes cost reduction and benefit increase; at the same time, the structure does not need to be provided with a battery cell adapter piece, improves the design margin of the battery cell, reduces the weight of the battery cell, and is beneficial to ensuring the energy density of the battery cell; at the same time, the structure is also beneficial to reducing the internal resistance, thereby slowing down the temperature rise and ensuring the safety of the battery cell.

[0061] Specific implementation steps:

[0062] ​​Firstly, the electric core 3 is arranged in the shell 1, then the lug 4 on the electric core 3 is penetrated through the cover plate 2, the cover plate 2 is sealingly connected with the shell 1, the sealing interface is realized by melting the hot melting ring 5 in a heating mode, finally the lug 4 is connected with the busbar.

[0063] The above merely describes the preferred embodiment of the present application, and is not intended to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A tab electrical connection structure, characterized by: The application relates to a battery cell, which comprises a shell (1), a cover plate (2), an electric core (3), a tab (4) and a hot melting ring (5), wherein, One side of the shell (1) is open; The cover plate (2) seals the opening of the shell (1); The electric core (3) is arranged in the shell (1); The tab (4) is electrically connected with the electric core (3) and penetrates through the cover plate (2); The hot melting ring (5) is arranged on the cover plate (2) and surrounds the tab (4).

2. The tab electric connection structure according to claim 1, wherein: The tab (4) is a laminated tab.

3. The tab electric connection structure according to claim 1, wherein: The hot melting ring (5) and the cover plate (2) are in an integral structure.

4. The tab electric connection structure according to claim 1, wherein: The hot melting ring (5) protrudes from the side of the cover plate (2) which is away from the shell (1).

5. The tab electrical connection structure according to any one of claims 1 to 4, characterized in that: A through hole (201) is arranged in the cover plate (2) and the hot melting ring (5), and the through hole (201) is in a trapezoidal shape, and the flared end of the through hole (201) faces the inside of the shell (1).

6. The tab electrical connection structure according to any one of claims 1 to 4, characterized by: The tab (4) is divided into a first tab (41) and a second tab (42), wherein, The first tab (41) is a positive tab; The second tab (42) is a negative tab; The first tab (41) and the second tab (42) are both electrically connected with the electric core (3) and penetrate through the cover plate (2).

7. The tab electrical connection structure according to claim 6, wherein: The first tab (41) and the second tab (42) are each provided with at least two pieces.

8. The tab electrical connection structure of claim 7, wherein: The first tab (41) and the second tab (42) both comprise a connecting part (411) and an extension part (412), wherein, The connecting part (411) is electrically connected with the electric core (3); The extension part (412) is connected with the connecting part (411) and penetrates through the cover plate (2).

9. The tab electrical connection structure of claim 8, wherein: The extension parts (412) of two pieces of the first tab (41) are connected, and the extension parts (412) of two pieces of the second tab (42) are connected.

10. A square-shaped battery cell characterized by: The application further relates to a battery cell comprising the tab electric connection structure as claimed in any one of claims 1-9.

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