Combined collector plate, battery and battery module

Abstract

The utility model relates to the technical field of batteries, and discloses a combined collector plate, a battery and a battery module. The combined current collecting plate is used for connecting tabs at the same end of a multi-tab battery cell and comprises a plurality of first current collecting plate bodies and a second current collecting plate body, and each first current collecting plate body is provided with a containing groove used for correspondingly clamping the tabs in the containing groove; and the second flow collecting disc body is connected with the plurality of first flow collecting disc bodies, so that the plurality of first flow collecting disc bodies are conducted. According to the invention, a kneading process is not needed, so that not only are battery cell scrapping and safety risks caused by chippings brought by a kneading process and outward turning of foil materials avoided, but also the problem of pseudo soldering between the battery cell and a kneading layer is avoided. Besides, the tabs are connected with the accommodating grooves and do not need to be flattened, the tabs are in a vertical state, and even if the tabs are welded with the first collector plate body, the tabs cannot be in contact with the isolating membrane in the welding process, so that the problem that the isolating membrane is burnt out cannot occur, and the performance of the battery is ensured.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a combined current collector, battery and battery module. Background Technology

[0002] Currently, the manufacturing process of cylindrical batteries requires first flattening the tabs of the cell, and then laser welding the flattened tabs to the current collector. However, due to large fluctuations in the flattening density and the thickness of the flattened layer, problems such as burning of the separator or incomplete welds between the separator and the flattened layer occur during the welding process. In addition, the current flattening process also produces problems such as debris and foil flipping, all of which can lead to cell scrapping and safety risks. Utility Model Content

[0003] To address the aforementioned technical issues, this application provides a combined current collector, battery, and battery module. When welding the current collector to the battery cell, the battery cell does not need to be flattened, thereby avoiding the scrapping and safety risks caused by debris and foil flipping during the flattening process. At the same time, it avoids problems such as burning the separator or poor welding during the welding process, ensuring the performance of the battery.

[0004] The technical solution adopted by this application to solve its technical problem is:

[0005] A combined current collector for connecting tabs at the same end of a multi-tab battery cell, comprising:

[0006] The first collector plate body, there are multiple first collector plates body, and the first collector plate body is provided with a receiving groove for correspondingly snapping multiple electrode tabs into the receiving groove;

[0007] The second collector is connected to multiple first collectors to enable communication between the multiple first collectors.

[0008] Preferably, the first collector plate is U-shaped, including a connecting part and a first snap-fit ​​part and a second snap-fit ​​part disposed at both ends of the connecting part. The inner walls of the first snap-fit ​​part, the connecting part and the second snap-fit ​​part form the receiving groove, and the second collector plate is connected to the outer wall surface of the first snap-fit ​​part.

[0009] Preferably, the depth of the receiving groove is 0.05 to 5 mm.

[0010] A battery comprising:

[0011] case;

[0012] A winding core is disposed inside the housing, and positive and negative tabs are respectively provided at both ends of the winding core;

[0013] Positive current collector, connected to the positive electrode tab;

[0014] The negative current collector disc is connected with the negative tab and the bottom wall of the shell.

[0015] The positive current collector disc and the negative current collector disc are both the combined current collector disc.

[0016] Preferably, the positive tab and the negative tab each include multiple groups, and each group of the positive tab or the negative tab includes multiple tab units, and the multiple tab units of each group form a multi-tab conductor which is correspondingly clamped in the accommodating groove.

[0017] Preferably, the multiple groups of the positive tab or the multiple groups of the negative tab are uniformly distributed around the central axis of the winding core, and the multiple tab units of each group of the positive tab or the negative tab are arranged along the radial direction of the winding core, and the length of the tab units gradually increases from the center of the winding core to the outer wall thereof.

[0018] Preferably, each group of the positive tab or the negative tab includes a main body portion and a support portion which are perpendicular to each other, the other end of the support portion is connected with the winding core, and the main body portion is clamped in the accommodating groove.

[0019] Preferably, the first current collector disc body is located between the second current collector disc body and the winding core, and a net-shaped insulating gasket is arranged between the second clamping portion and the end surface of the winding core, and the main body portion is supported on the insulating gasket.

[0020] Preferably, the thickness of the insulating gasket is 0.15-0.25mm.

[0021] A battery module includes the above-mentioned battery.

[0022] Compared with the prior art, the combined current collector disc, the battery and the battery module have the following beneficial effects: multiple first current collector disc bodies are arranged at the two ends of the winding core, and accommodating grooves for clamping the tabs are arranged on the first current collector disc bodies, and a second current collector disc body is arranged to connect the multiple first current collector disc bodies, so that the multiple first current collector disc bodies are in conduction with each other. Therefore, when the battery is manufactured, the multi-tab is directly manufactured by die cutting, the tabs are connected with the accommodating grooves of the first current collector disc bodies, and then the second current collector disc body is connected with the multiple first current collector disc bodies, so that the connection between the winding core and the current collector disc is realized, and the rubbing process is not needed. Therefore, the problems such as scraps and foil material outturn caused by the rubbing process are avoided, and the safety risk of the winding core is avoided. In addition, since the tabs are connected with the accommodating grooves and do not need to be rubbed, the tabs are in a vertical state. Even if the tabs are welded with the first current collector disc body, the isolation film will not be contacted during the welding process, so that the problem of burning the isolation film is avoided, and the performance of the battery is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 A structural schematic diagram of a battery of the present application.

[0024] Figure 2 A structural schematic diagram of a combined current collector plate of the present application.

[0025] Figure 3 A structural schematic diagram of a multi-tab conductor connected with a first current collector plate body of the present application.

[0026] Figure 4 A structural schematic diagram of a foil material with a group of tabs cut out of the present application.

[0027] Wherein: 100-combined current collector plate, 1-first current collector plate body, 11-connection part, 12-first clamping part, 13-second clamping part, 14-receiving groove, 2-second current collector plate body, 10-winding core, 20-positive tab, 30-negative tab, 40-positive current collector plate, 50-negative current collector plate, 60-multi-tab conductor, 601-tab unit, 602-main body part, 603-supporting part, 70-foil material, 80-insulating gasket. DETAILED DESCRIPTION

[0028] In the present application, the terms "mount", "set", "provided with", "connected", "linked" should be understood broadly. For example, it can be fixed connection, detachable connection, or integral structure; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate media, or internal communication between two devices, elements or components. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0029] In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements or components (the specific types and structures may be the same or different), and are not intended to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise stated, the meaning of "a plurality of" is two or more.

[0030] The specific embodiments of the present application are described in further detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present application, but are not used to limit the scope of the present application.

[0031] In this application, unless specifically defined otherwise, the terms "mounting", "connected", "connection", "fixed", and the like should be understood broadly, for example, can be fixed connection, can also be detachable connection, or integral; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be internal communication of two elements or interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0032] As shown in Figures 1-2 A battery according to a preferred embodiment of the present application includes a shell, a winding core 10, a positive current collector plate 40 and a negative current collector plate 50. The shell has an opening, the winding core 10 is inserted into the shell through the opening, and a cover is provided on the opening. The winding core 10 is wound by a positive plate, a negative plate and a diaphragm, and has a positive lug 20 and a negative lug 30 at two ends respectively. The positive current collector plate 40 is connected to the positive lug 20, and the positive current collector plate 40 is connected to the cover. The negative current collector plate 50 is connected to the negative lug 30, and the negative current collector plate 50 is connected to the bottom wall of the shell, so that the shell is negatively charged.

[0033] The positive current collector plate 40 and the negative current collector plate 50 are both a combined current collector plate 100, and have the same structure. Specifically, the combined current collector plate 100 includes a first current collector plate body 1 and a second current collector plate body 2. The first current collector plate body 1 is provided with a receiving groove 14 for corresponding clamping of a plurality of lugs (the lug in this application is the positive lug 20 or the negative lug 30). Specifically, one lug can be connected to one receiving groove 14, or a plurality of lugs can be connected to one receiving groove 14. The second current collector plate body 2 is connected to a plurality of first current collector plate bodies 1 by welding, so that the plurality of first current collector plate bodies 1 are in conduction.

[0034] The battery based on the technical features has the following advantages. The first current collecting disc body 1 is arranged at both ends of the battery cell, the accommodating groove 14 for clamping the tab is arranged on the first current collecting disc body 1, and the second current collecting disc body 2 is arranged to connect the first current collecting disc bodies 1 to make the first current collecting disc bodies 1 conductive. Therefore, when the battery is manufactured, the multi-tab is directly manufactured by die cutting, the tab is connected to the accommodating groove 14 of the first current collecting disc body 1, and the second current collecting disc body 2 is welded to the first current collecting disc bodies 1 to realize the connection between the battery cell and the current collecting disc. The rubbing process is not needed, the scraps and foil material outturn caused by the rubbing process are avoided, the battery cell is not scrapped and the safety risk is avoided, and the problem of virtual welding between the rubbing layer is avoided. In addition, the tab is connected to the accommodating groove 14 and does not need to be rubbed. The tab is in a vertical state. Even if the tab is welded to the first current collecting disc body, the tab does not contact the isolation film in the welding process, the isolation film is not burned, and the performance of the battery is ensured.

[0035] In the embodiment, the first current collecting disc body 1 has a U-shaped cross section, includes a connecting portion 11 and first and second clamping portions 12 and 13 arranged at both ends of the connecting portion 11, the inner walls of the first and second clamping portions 12 and 13 and the connecting portion 11 form the accommodating groove 14, and the second current collecting disc body 2 is connected to the outer wall surface of the first clamping portion 12. That is, the outer wall surfaces of the first clamping portions 12 of the first current collecting disc bodies 1 at the same end are horizontal and located on the same horizontal plane after being connected, the second current collecting disc body 2 is a circular flat plate, and one surface of the second current collecting disc body 2 is welded to the outer wall surfaces of the first clamping portions 12 of the first current collecting disc bodies 1. The first and second current collecting disc bodies 1 and 2 are made of copper or aluminum and are integrally formed. Compared with the rubbing layer of the tab, the first and second current collecting disc bodies 1 and 2 have large density and stable energy absorption. Therefore, the first and second current collecting disc bodies 1 and 2 are not welded through when being welded.

[0036] In the embodiment, the positive tab 20 and the negative tab 30 each include a plurality of groups, generally one to twenty groups, and the plurality of groups of tabs are uniformly distributed around the center axis of the winding core 10. Each group of tabs includes a plurality of tab units 601, and the plurality of tab units 601 of each group of tabs form a multi-tab conductor 60. The multi-tab conductor 60 is clamped in the accommodating groove 14 in one-to-one correspondence with the first current collecting disc body 1.

[0037] Please refer to the accompanying drawings Figure 3 , 4Specifically, the plurality of the tab units 601 of each group of the tabs are arranged along the radial direction of the winding core 10, and the length of the tab units 601 gradually increases from the center of the winding core 10 to the outer wall thereof. In the manufacturing process, the foil 70 can be formed into a plurality of groups of tabs by gradient die cutting, and after winding, the plurality of tab units 601 of each group of the tabs are aligned to form a multi-tab conductor 60 by pre-welding. Finally, a plurality of multi-tab conductors 60 are formed at both ends of the battery cell, and the multi-tab conductors 60 are connected by the combined current collector plate 100.

[0038] In the connection process, the plurality of tab units 601 are first clamped and fitted, and pre-welding is performed. Then, the U-shaped accommodating groove 14 is buckled on the multi-tab conductor 60. At this time, the first current collector plate body 1 is perpendicular to the diameter direction of the winding core 10 (i.e., the tab is perpendicular to the end surface of the winding core 10 at this time). In order to ensure the stability of the connection between the two, the multi-tab conductor 60 and the first current collector plate body 1 can be connected by laser welding. Since the first current collector plate body 1 is perpendicular or suspended in the diameter direction of the battery cell during the welding process, there is no contact with the isolation film during the welding process, and the isolation film will not be burned. When the first current collector plate body 1 is completely welded, the multi-tab conductor 60 is bent 90 degrees towards the center axis direction of the winding core 10, so that the outer wall surface of the first clamping portion 12 of the first current collector plate body 1 is parallel to the end surface of the winding core 10. Then, the planar second current collector plate 2 is covered on the first current collector plate body 1, and they are welded together to realize conduction.

[0039] Since the multi-tab conductor 60 needs to be bent 90 degrees, the plurality of tab units 601 of each group of the tabs are arranged in a form that the length of the tab units 601 gradually increases from the center of the winding core 10 to the outer wall thereof. This not only ensures that the end surfaces of the plurality of tab units 601 near the center axis of the winding core 10 are flush after being bent, so as to completely fit the inner wall of the connecting portion 11, but also ensures that the adjacent surfaces between the tab units 601 are completely fitted, so as to realize regular stacking between the tab units 601, and improve the flatness and density.

[0040] In this application, since the multi-tab conductor 60 is vertical during the welding process, when welding the left and right directions of the multi-tab conductor 60, the vertical welding angle range can be within 0°-180°, which can ensure that there is no contact around the first current collector plate body 1. During the welding process, the laser only acts on the first current collector plate body 1, so even if the first current collector plate body 1 is welded through, the isolation film will not be burned.

[0041] Please refer to the accompanying drawings Figure 3As known from the above, the multi-tab conductors 60 are vertically before welding and need to be bent after welding, so each group of the tabs (multi-tab conductors 60) can be defined as a perpendicular main body 602 and a support part 603, the other end of the support part 603 is connected to the core 10, the main body 602 is clamped in the accommodating groove 14, and the bending is along the connection between the main body 602 and the support part 603. The area of the first current collector body 1 is designed to match the die-cut tab length and width size, and the depth of the accommodating groove 14 is determined by the length of the main body 602. However, generally, the depth of the accommodating groove 14 is 0.05-5 mm, such as 0.1 mm, 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, etc., or any value or range between any two of the above values. It should be noted that if the lengths of the first clamping part 12 and the second clamping part 13 are the same, the depth of the accommodating groove 14 is the length of the inner surface of the first clamping part 12 or the second clamping part 13; if the lengths of the first clamping part 12 and the second clamping part 13 are different, the depth of the accommodating groove 14 is the length of the inner surface of the one with shorter length between the first clamping part 12 and the second clamping part 13. In this application, the length of the first clamping part 12 is preferably greater than the length of the second clamping part 13, and the difference in length is the width of the support part 603, so that when the multi-tab conductors 60 are bent, the end of the first clamping part 12 away from the center axis of the core 10 is flush with the outer surface of the support part 603, and the end of the second clamping part 13 away from the center axis of the core 10 is flush with the inner surface of the support part 603.

[0042] As known from the above, the first current collector body 1 is located between the second current collector body 2 and the core 10, so as to avoid short circuit caused by the first current collector body 1 conducting the positive and negative materials of the core 10 after bending, an insulating gasket 80 can be arranged between the second clamping part 13 and the end surface of the core 10, which can not only play an insulating role, but also support the main body 602 on the insulating gasket 80, thereby supporting the main body 602. At the same time, it is convenient for electrolyte to infiltrate, the insulating gasket 80 needs to be arranged in a mesh shape, and the thickness thereof is 0.15-0.25 mm, such as 0.16 mm, 0.17 mm, 0.18 mm, 0.19 mm, 0.2 mm, 0.21 mm, 0.22 mm, 0.23 mm, 0.24 mm, etc., or any value or range between any two of the above values.

[0043] To solve the above technical problems, the application also provides a battery module, which comprises a plurality of the above-mentioned batteries and a conductive connecting piece, and two adjacent batteries are connected by the conductive connecting piece, and the series and parallel connection between the batteries is formed by connecting the conductive connecting pieces.

[0044] The battery module of the present application, the current collecting disc of the battery is welded with the battery cell without the need to rub the battery cell, thereby avoiding the problems such as debris and foil outturn caused by the rubbing process, which leads to the scrapping and safety risk of the battery cell, and avoiding the problems such as burning the isolation film or false welding in the welding process, thereby ensuring the performance of the battery.

[0045] The above is only the preferred embodiment of the present application, and it should be pointed out that for ordinary skilled in the art, without departing from the technical principles of the present application, a number of improvements and substitutions can be made, which should be considered as the protection scope of the present application.

Claims

1. A combination tab-plate for connecting the tabs of a multi-tab cell at the same end, characterized in that: The application relates to a battery, which comprises: a plurality of first current collecting disc bodies, each of which is provided with a containing groove for clamping a plurality of tabs in the containing groove; a second current collecting disc body connected with the plurality of first current collecting disc bodies to make the plurality of first current collecting disc bodies conductive.

2. The combi- current collector plate according to claim 1, wherein: The first current collecting disc body is U-shaped, which comprises a connecting part and first and second clamping parts arranged at two ends of the connecting part, the inner walls of the first and second clamping parts and the connecting part form the containing groove, and the second current collecting disc body is connected with the outer wall surface of the first clamping part.

3. The combi-busbar according to claim 1, wherein: The depth of the containing groove is h, and h is 0.05-5 mm.

4. A battery, characterized by: The application relates to a battery, which comprises: a shell; a winding core arranged in the shell, the winding core being provided with a positive tab and a negative tab at two ends respectively; a positive current collecting disc connected with the positive tab; a negative current collecting disc connected with the negative tab and the bottom wall of the shell; the positive and negative current collecting discs are the combined current collecting disc according to any one of claims 1-3.

5. The battery of claim 4, wherein: The positive and negative tabs each comprise a plurality of groups, each group of the positive or negative tabs comprises a plurality of tab units, and the plurality of tab units of each group form a multi-tab conductor which is clamped in the containing groove one by one.

6. The battery of claim 5, wherein: The plurality of groups of the positive or negative tabs are uniformly distributed around the central axis of the winding core, the plurality of tab units of each group of the positive or negative tabs are arranged along the radial direction of the winding core, and the lengths of the tab units gradually increase from the center of the winding core to the outer wall thereof.

7. The battery of claim 4, wherein: Each group of the positive or negative tabs comprises a main body part and a support part which are perpendicular to each other, the support part is connected with the winding core, and the main body part is clamped in the containing groove.

8. The battery of claim 7, wherein: The first current collecting disc body is located between the second current collecting disc body and the winding core, and a net-shaped insulating gasket is arranged between the second clamping part and the end surface of the winding core, and the main body part is supported on the insulating gasket.

9. The battery of claim 8, wherein: The thickness of the insulating gasket is 0.15-0.25 mm.

10. A battery module, characterized by: The application further relates to a battery comprising the battery according to any one of claims 4-9.

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