Battery cell and battery cell module
By covering the gap between the electrode tabs with an insulating pad, the problem of short circuits inside the electrode tabs after hot pressing of the battery cells was solved, thus achieving effective cost control and simplified production process.
Patent Information
- Application Number
- CN202423123058.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-17
- Publication Date
- 2025-12-09
- Estimated Expiration
- 2034-12-17
AI Technical Summary
The gap formed by the expansion of the core after hot pressing of the battery cell causes a short circuit in the electrode tab. Existing technologies using high-cost coating diaphragm processes are difficult to solve effectively and are not conducive to controlling production costs.
An insulating pad is placed over the tab to seal the gap between the layers, and then fixed with insulating tape to prevent the tab from being inserted internally.
It effectively prevents short circuits inside the tabs, reduces battery production costs, and simplifies the operation process.
Smart Images
Figure CN223651441U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to lithium ion battery technical field especially relates to a kind of electric core and electric core module. BACKGROUND
[0002] At present, the phenomenon of core expansion exists after hot pressing, after the expansion of the roll core, there is a gap between the roll core diaphragm layer and layer, when the core is combined, the tab is easily inserted into the gap after bending and contacts the aluminum foil or copper foil, causing short circuit, resulting in the scrap of the core.
[0003] In order to reduce the gap, the existing technology generally uses the process of coating the diaphragm, so that the diaphragm and the positive and negative plates are bonded together after hot pressing, thereby eliminating the gap between the diaphragm and the plate. However, the diaphragm used in this coating process has a high cost, which is not conducive to the control of the production cost of lithium battery products.
[0004] Therefore, under the premise of controlling the production cost of the battery, how to avoid the short circuit caused by the insertion of the tab due to the gap formed by the expansion of the roll core after hot pressing has become a technical problem to be solved in the field.
[0005] The above information is given as background information only to assist in understanding the present disclosure, and does not determine or acknowledge whether any of the above content can be used as prior art with respect to the present disclosure. UTILITY MODEL CONTENT
[0006] The purpose of the utility model is to provide an electric core and an electric core module to solve or at least partially solve the technical problems existing in the prior art.
[0007] To achieve this purpose, the utility model adopts the following technical solutions:
[0008] In the first aspect, the utility model provides an electric core, which includes a positive plate, a negative plate, a diaphragm sandwiched between the positive plate and the negative plate, a positive tab connected to the positive plate and extending from the end face of the electric core body, and a negative tab connected to the negative plate and extending from the end face of the electric core body.
[0009] The positive tab and the negative tab are collectively referred to as the tab, and the end face of the electric core extending out of the tab is referred to as the tab end. The tab end is covered with an insulating gasket to prevent the end of the tab extending out of the tab end from being inserted back into the electric core.
[0010] Optionally, the insulating gasket is adhesively fixed to the electric core.
[0011] Optionally, the insulating gasket is adhesively fixed to the electric core by an insulating tape.
[0012] Optionally, the electric core is a roll core, and the roll core comprises a roll core body wound by the positive electrode sheet, the negative electrode sheet and the diaphragm.
[0013] Optionally, the diaphragm is a PP bare diaphragm.
[0014] Optionally, the insulating gasket is arranged on one side of the tab end, and the tab is located on the other side of the tab end.
[0015] Optionally, the positive tab is provided with a plurality of positive tabs, and the plurality of positive tabs are gathered and electrically connected; and / or the negative tab is provided with a plurality of negative tabs, and the plurality of negative tabs are gathered and electrically connected.
[0016] Optionally, the insulating gasket is a PET sheet.
[0017] In a second aspect, the utility model also provides a kind of electric core module, comprising a plurality of one kind of electric core described above, and a plurality of the electric core is formed into electric core module after being combined;In the electric core module, the positive tab of a plurality of the electric core is electrically connected, and the negative tab of a plurality of the electric core is electrically connected.
[0018] Optionally, the number of the electric core is two.
[0019] Optionally, the positive tab of a plurality of the electric core is electrically connected by positive adapter sheet, and the positive tab of a plurality of the electric core is electrically connected by negative adapter sheet.
[0020] Optionally, the positive adapter sheet is aluminum sheet; and / or the negative adapter sheet is copper sheet.
[0021] Compared with prior art, the utility model has the following beneficial effects:
[0022] The utility model provides a kind of electric core, by increasing insulating gasket, the layer of electric core body and layer gap are sealed, to eliminate the possibility of tab insertion in the process of two electric cores combined, to solve the short circuit bad hidden danger caused by tab insertion, and the production cost of battery is excellently controlled.
[0023] The utility model has other characteristics and advantages, which will be obvious from the drawings incorporated herein and the subsequent specific embodiments, or will be described in detail in the drawings incorporated herein and the subsequent specific embodiments, which are used together to explain the specific principles of the utility model. BRIEF DESCRIPTION OF DRAWINGS
[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.
[0025] Figure 1 The structure diagram of the interlayer gap plugging structure of the battery cell provided by the embodiment of the present application.
[0026] Figure 2 The partial structure diagram of the battery cell module provided by the embodiment of the present application.
[0027] In the figure: 10, battery cell; 11, tab; 20, insulating gasket; 21, insulating tape; 30, adapter plate; 40, shaping cover plate. DETAILED DESCRIPTION
[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.
[0029] In this paper, the term "embodiment" means that the specific features, structures or characteristics described in combination with the embodiment can be included in at least one embodiment of the present application. The term "embodiment" appearing in various places in the specification does not necessarily refer to the same embodiment, and does not particularly limit its independence or association with other embodiments. In principle, in this application, as long as there is no technical contradiction or conflict, each technical feature mentioned in each embodiment can be combined in any way to form a corresponding implementable technical solution.
[0030] Unless otherwise defined, the meanings of the technical terms used in this paper are the same as those commonly understood by those skilled in the art to which the present application belongs; the use of related terms in this paper is only for the purpose of describing specific embodiments, and is not intended to limit the present application.
[0031] In the description of the present application, the word "and / or" is a description of the logical relationship between the objects, which means that there can be three relationships, for example, A and / or B, which means that there are three cases: A exists, B exists, and A and B exist at the same time. In addition, the character " / " in this paper generally represents that the associated objects before and after are a "or" logical relationship.
[0032] In the present application, the terms such as "first" and "second" are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual number, primary or secondary, or order relationship between the entities or operations.
[0033] In the present application, the "comprise", "include", "have" or other similar expressions used in the statements are intended to cover the non-exclusive inclusion, and the expressions do not exclude the presence of additional elements in the process, method or product comprising the elements, so that the process, method or product comprising a series of elements can not only include those defined elements, but also include other elements not explicitly listed, or also include the elements inherent to such process, method or product.
[0034] As the same understanding as in the "Guidelines for Examination", in the present application, the expressions such as "greater than", "less than", "exceed" are understood as not including the number; the expressions such as "above", "below", "within" are understood as including the number. In addition, in the description of the embodiments of the present application, the meaning of "multiple" is more than two (including two), and similar expressions related to "multiple" are also understood in this way, for example, "multiple groups", "multiple times" and the like, unless otherwise explicitly specified.
[0035] In the description of the embodiments of the present application, the spatial-related expressions used, such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "perpendicular", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. The indicated orientation or position relationship is based on the orientation or position relationship shown in the specific embodiment or the drawing, and is only for the convenience of describing the specific embodiments of the present application or for the reader to understand, and does not indicate or imply that the indicated device or component must have a specific position, a specific orientation, or be constructed or operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.
[0036] Unless otherwise explicitly specified or limited, in the description of the embodiments of the present application, the terms "mount", "connect", "connect", "fix", "set", etc. should be understood in a broad sense. For example, the "connection" can be a fixed connection, or a detachable connection, or an integral setting; it can be a mechanical connection, or an electrical connection, or a communication connection; it can be directly connected, or indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art to which the present application belongs, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.
[0037] Embodiment one:
[0038] Please refer to Figure 1 , Figure 1 is a structure diagram of an interlayer gap sealing structure of an electric core provided by the embodiment of the utility model;
[0039] Specifically, the electric core 10 in the embodiment is a roll core, comprising an electric core body wound by a positive plate, a negative plate and a diaphragm sandwiched between the positive plate and the negative plate, a positive lug connected to the positive plate and extending out from the end face of the electric core body, and a negative lug connected to the negative plate and extending out from the end face of the electric core body;
[0040] For the convenience of description, in the embodiment, the positive lug and the negative lug are collectively referred to as the lug 11, and the end face of the electric core body from which the lug extends is referred to as the lug end;
[0041] The lug end is covered with an insulating gasket 20 to prevent the end of the lug 11 extending out of the lug end from being inserted back into the electric core body from the lug end.
[0042] Specifically, the diaphragm is a PP (polypropylene) bare diaphragm.
[0043] Specifically, the insulating gasket 20 is arranged on one side (the upper side of the lug end) of the lug end; and the lug 11 is located on the other side (the lower side of the lug end) of the lug end. Figure 1 Figure 1
[0044] The positive lug is provided with a plurality of positive lugs, and the plurality of positive lugs converge and are in electrical communication; and / or the negative lug is provided with a plurality of negative lugs, and the plurality of negative lugs converge and are in electrical communication.
[0045] Specifically, the insulating gasket is made of a PET (Polyethylene terephthalate, thermoplastic polyester) sheet.
[0046] Before the core combining process, the two electric cores 10 (i.e. JR-A and JR-B in Figure 1 ) need to be placed flat on the workbench, i.e. the placement state of the electric core 10 as shown in Figure 1 , at this time, the lug ends of the two electric cores 10 are arranged opposite to each other;
[0047] When the hot-pressed electric core 10 is placed flat on the work plane, Figure 1 the lower half of the electric core 10 needs to bear the weight of the upper half, so the lower side of the lug end of the electric core 10 generally does not have a gap due to fluffing;
[0048] Therefore, in the embodiment, the insulating gasket 20 is adhered and fixed to the upper side of the lug end of the electric core 10 in Figure 1 to cover the interlayer gap of the electric core 10;
[0049] Please continue to refer to this. Figure 2 , Figure 2 This is a partial structural schematic diagram of a battery cell module provided in an embodiment of this utility model;
[0050] As an optional implementation, in this embodiment, the insulating pad 20 is bonded and fixed to the battery cell 10 by the insulating tape 21; the area of the insulating tape 21 can be adjusted according to specific application requirements, but it must be ensured that it at least covers the insulating pad 20.
[0051] The battery cell 10 provided in this embodiment, by adding an insulating pad 20, seals the gap between the diaphragm layer and the layer, thereby eliminating the possibility of the tab 11 being inserted into the core during the process of combining two battery cells 10, thus solving the potential short circuit problem caused by the insertion of the tab 11.
[0052] Example 2:
[0053] Please refer to Figure 2 The battery cell module contains several battery cells, which are combined to form the battery cell module.
[0054] In the battery cell module, the tab 11 includes a positive tab and a negative tab; in this embodiment, the positive tabs of several battery cells are electrically connected, and the negative tabs of several battery cells are electrically connected.
[0055] Specifically, the positive terminals of several battery cells are electrically connected to each other through a positive terminal adapter, and the positive terminals of several battery cells are electrically connected to each other through a negative terminal adapter.
[0056] For example, there are two battery cells; the battery cell 10 is a wound core, which is formed by winding a positive electrode sheet, a negative electrode sheet and a separator.
[0057] like Figure 1 As shown, before the core is assembled, after the insulating gasket 20 is bonded and fixed, the electrode tab 11 needs to be shaped by the shaping cover plate 40. In this embodiment, in order to further eliminate the possibility of the electrode tab 11 of the battery cell 10 being inserted internally, the shaping cover plate 40 oriented the electrode tab 11 towards the inside of the battery cell 10. Figure 1 Shaping and pressing in the lower direction (but not exceeding) Figure 1 Below the middle cell 10, after being shaped and pressed, the tab 11 forms the tab 11 of the cell 10, and then the tab 11 is welded and fixed on the adapter plate 30.
[0058] Furthermore, after the two battery cells 10 are joined together, the insulating pad 20 is located on the side of the two battery cells 10 that are close to each other after joining together;
[0059] Specifically, the adapter piece 30 is a conductive metal sheet. As an optional implementation, the positive electrode adapter piece is an aluminum sheet, and the negative electrode adapter piece is a copper sheet.
[0060] The electric cell module provided by the embodiment prevents the possibility of the tab 11 being inserted in the process of combining the two electric cells 10 by increasing the insulating gasket 20 to seal the diaphragm layer and the interlayer gap, thereby solving the short circuit defect caused by the tab 11 being inserted, and the insulating gasket 20 is low in cost and can be fixed by only the insulating tape 21, so that the operation is very simple and the production cost of the battery is also well controlled.
[0061] Embodiment three:
[0062] The battery provided by the embodiment comprises a plurality of electric cell modules, and the electric cell module adopts the electric cell module as described in the embodiment two.
[0063] The electric cell module has been described in detail in the embodiment two, so the description is not repeated in the embodiment.
[0064] Specifically, the battery is a lithium ion battery.
[0065] The battery of the embodiment solves the short circuit defect caused by the tab 11 being inserted and well controls the production cost of the battery, because the diaphragm layer and the interlayer gap are sealed by the insulating gasket 20, and the electric cell module will not have the phenomenon of the tab 11 being inserted in the process of combining the two electric cells 10.
[0066] The above-described embodiments are only used to illustrate the technical solutions of the present application, but not to limit the present application; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can be modified, or some technical features can be replaced by equivalent ones; and these modifications or replacements do not make the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.
Claims
1. An electric cell, characterized by, The positive electrode sheet, the negative electrode sheet, the separator, the positive tab and the negative tab are collectively referred to as tabs, and the end face of the battery cell from which the tabs extend is referred to as a tab end. The tab end is covered with an insulating gasket to prevent the tabs from being inserted into the battery cell from the tab end.
2. The cell of claim 1, wherein The insulating gasket is bonded and fixed to the battery cell.
3. An electric cell according to claim 2, wherein The insulating gasket is bonded and fixed to the battery cell by an insulating adhesive tape.
4. The cell of claim 1, wherein, The battery cell is a winding core, and the winding core includes a winding core body wound by the positive electrode sheet, the negative electrode sheet and the separator.
5. An electric cell according to claim 4, wherein The separator is a PP bare film.
6. The cell of claim 1, wherein, The insulating gasket is arranged on one side of the tab end, and the tab is arranged on the other side of the tab end.
7. An electric cell according to claim 6, wherein The positive tab is provided with a plurality of positive tabs, and the plurality of positive tabs are gathered and electrically connected; and / or the negative tab is provided with a plurality of negative tabs, and the plurality of negative tabs are gathered and electrically connected.
8. The cell of claim 1, wherein, The insulating gasket is made of a PET sheet.
9. An electrochemical cell module, characterized by, A plurality of battery cells according to any one of claims 1-8 are combined to form a battery cell module; in the battery cell module, the positive tabs of the plurality of battery cells are electrically connected, and the negative tabs of the plurality of battery cells are electrically connected.
10. The battery cell module of claim 9, wherein, The number of battery cells is two.
11. The module of claim 9, wherein, The positive tabs of the plurality of battery cells are electrically connected by a positive adapter plate, and the negative tabs of the plurality of battery cells are electrically connected by a negative adapter plate.
12. The module of claim 11, wherein, The positive adapter plate is an aluminum plate; and / or the negative adapter plate is a copper plate.