Battery and electric equipment
By thinning the protruding parts of the aluminum-plastic film, the thickness difference problem caused by the tab support in the wound cell was solved, the formation interface formation and electrolyte enrichment risk were improved, and the formation process and appearance quality of the battery were enhanced.
Patent Information
- Application Number
- CN202423088752.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-13
- Publication Date
- 2025-12-19
- Estimated Expiration
- 2034-12-13
AI Technical Summary
The thickness difference caused by the bulge of the wound cell under the support of the tab affects the formation of the formation interface, and the accumulation of electrolyte leads to poor appearance due to the swelling.
Thinning is performed on the protruding parts of the aluminum-plastic film to match the thickness of the covered parts with that of the non-protruding parts, forming a flat appearance, reducing thickness differences, improving the uniformity of stress during the formation process, and reducing the risk of electrolyte accumulation.
It improves the formation of the battery interface, reduces uneven stress caused by thickness differences in protrusions, reduces the risk of electrolyte accumulation in protrusions, and improves the appearance quality of the battery.
Smart Images
Figure CN223693246U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to battery technology field especially relates to a battery and electric equipment. BACKGROUND
[0002] For the winding type battery cell, the tab needs to be welded in the head region, and the tab needs to be pasted with the tab adhesive. In this way, when the winding type battery cell is compressed along the thickness direction of the tab, the part corresponding to the winding type battery cell and the tab will be convex under the support of the tab. This problem will affect the stress condition of the winding type battery cell in the formation process and affect the formation of the interface. In addition, after the electrolyte is injected into the winding type battery cell, the electrolyte is also easy to accumulate around the convex part and cause the liquid to swell, resulting in appearance defects. SUMMARY
[0003] The utility model aims at solving one of the technical problems existing in the prior art. To this end, the utility model provides a battery, which can improve the effect of interface formation and / or reduce the risk of liquid swelling.
[0004] The utility model further provides an electric equipment with the above battery.
[0005] According to the battery of the first aspect of the utility model, the battery comprises: a battery cell, the battery cell comprises a battery cell body and a tab assembly, the tab assembly comprises a penetrating part, and the penetrating part penetrates in the battery cell body; wherein the part of the battery cell body that is convex on the surface under the support of the penetrating part is defined as a convex part, and the other part is a non-convex part; an aluminum plastic film, the aluminum plastic film is wrapped outside the battery cell body, the aluminum plastic film comprises a first covering part and a second covering part, the thickness of the first covering part is less than the thickness of the second covering part, the first covering part covers the surface of the convex part, and the second covering part covers the surface of the non-convex part.
[0006] According to the battery of the utility model, at least the following beneficial effects are achieved:
[0007] In the battery of the utility model, the part of the aluminum plastic film corresponding to the convex part is thinned, so that when the whole aluminum plastic film is wrapped around the battery cell body, the problem of thickness difference caused by the convex part of the battery can be improved, thereby facilitating the reduction of the risk of affecting the interface formation due to the stress difference of the battery in the subsequent formation process. At the same time, by improving the problem of thickness difference caused by the convex part of the battery, after the electrolyte is injected into the battery cell, the problem of liquid swelling caused by the accumulation of electrolyte around the convex part can be improved.
[0008] According to some embodiments of the present application, the inner side of the aluminum plastic film is thinned to form the first covering part corresponding to the protruding part; wherein the inner side of the aluminum plastic film is the side of the aluminum plastic film close to the main body of the battery cell.
[0009] According to some embodiments of the present application, the outer side of the first covering part is connected with the outer side of the second covering part flatly; wherein the outer side of the aluminum plastic film is the side of the aluminum plastic film away from the main body of the battery cell.
[0010] According to some embodiments of the present application, the thickness of the first covering part is defined as T1, the thickness of the second covering part is defined as T2, and the protruding height of the protruding part relative to the non-protruding part is defined as H1; and T2-T1=H1 is satisfied.
[0011] According to some embodiments of the present application, the protruding part comprises a first protruding part and a second protruding part arranged in the thickness direction of the battery cell and disposed oppositely, and the first covering part comprises a first covering part A covering the surface of the first protruding part and a first covering part B covering the surface of the second protruding part.
[0012] According to some embodiments of the present application, the thickness of the first covering part A is defined as T 1a , the thickness of the first covering part B is defined as T 1b , the thickness of the second covering part is defined as T2, and the thickness of the penetrating part is defined as T3; wherein the thickness direction of the penetrating part is parallel to the thickness direction of the battery cell.
[0013] (T2-T 1a )+(T2-T 1b )=T3 is satisfied.
[0014] According to some embodiments of the present application, the first protruding part and the second protruding part are symmetrically disposed relative to a symmetry plane, and the first covering part A and the first covering part B are also symmetrically disposed relative to the symmetry plane; the thickness of the first covering part A and the first covering part B is defined as T 1c , the thickness of the second covering part is defined as T2, and the thickness of the penetrating part is defined as T3; wherein the thickness direction of the penetrating part is parallel to the thickness direction of the battery cell.
[0015] T2-T 1c =T3 / 2 is satisfied.
[0016] According to some embodiments of the present application, the tab assembly comprises a tab and a tab rubber disposed on the tab, wherein at least part of the tab and at least part of the tab rubber are penetrated into the main body of the battery cell.
[0017] According to some embodiments of the utility model, the electric core main body is a winding type structure, and the penetrating part is arranged in a space formed by the winding type structure.
[0018] According to the power equipment of the utility model, at least the following beneficial effects are achieved.
[0019] According to the power equipment of the utility model, at least the following beneficial effects are achieved.
[0020] The power equipment has the battery as described above, in which the aluminum plastic film is thinned in the part corresponding to the protruding part, so that when the whole aluminum plastic film is wrapped around the electric core main body, the problem of thickness difference of the battery caused by the protruding part can be improved, thereby facilitating the reduction of the risk of affecting the formation interface due to the force difference of the battery in the subsequent formation process. At the same time, by improving the problem of thickness difference of the battery caused by the protruding part, after the electrolyte is injected into the electric core, the problem of liquid swelling caused by the electrolyte accumulating around the protruding part can be improved.
[0021] The additional aspects and advantages of the utility model will be partially given in the following description, partially will become obvious from the following description, or will be understood through the practice of the utility model. BRIEF DESCRIPTION OF DRAWINGS
[0022] The utility model will be further described below in combination with the drawings and embodiments, in which:
[0023] Figure 1 It is the structural schematic diagram of the battery of one embodiment of the utility model before the aluminum plastic film is not covered on the electric core main body.
[0024] Figure 2 It is the structural schematic diagram of the battery of one embodiment of the utility model.
[0025] Figure 3 It is Figure 2 It is the partial enlarged view of the figure.
[0026] REFERENCE NUMERALS:
[0027] 100, electric core; 110, electric core main body; 111, protruding part; 111a, first protruding part; 111b, second protruding part; 112, non-protruding part; 120, tab assembly; 120a, tab; 120b, tab rubber; 121, penetrating part; 122, extending part;
[0028] 200, aluminum plastic film; 210, first covering part; 210a, first covering part A; 210b, first covering part B; 220, second covering part. DETAILED DESCRIPTION
[0029] The embodiments of the present application are described below in detail, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary only, and are used only for explaining the present application, and cannot be understood as a limitation of the present application.
[0030] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application. In addition, the features defined as "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.
[0031] In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication between two elements. 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.
[0032] In combination with Figure 1 With Figure 2 , the battery related to an embodiment of the present application comprises a battery cell 100 and an aluminum plastic film 200.
[0033] In combination with Figure 1 With Figure 2 , the battery cell 100 comprises a battery cell body 110 and a tab assembly 120, the tab assembly 120 comprises a penetrating portion 121 and an extension portion 122 connected with the penetrating portion 121, the penetrating portion 121 penetrates in the battery cell body 110, and the extension portion 122 extends out of the battery cell body 110.
[0034] The positive tab assembly and the negative tab assembly are connected to the positive sheet and the negative sheet respectively.
[0035] The positive tab assembly and the negative tab assembly are connected to the positive sheet and the negative sheet respectively.
[0036] It can be understood that the innermost circle of the winding type structure of the battery core body 110 surrounds the middle space, and the penetrating part of the positive tab assembly and the penetrating part of the negative tab assembly are both penetrated in the middle space to be connected to the positive sheet and the negative sheet respectively.
[0037] It should be noted that in the following description of the utility model, the positive tab assembly and the negative tab assembly are collectively referred to as the tab assembly.
[0038] The part of the battery core body 110 supported by the penetrating part 121 and protruding from the surface is defined as the protruding part 111, and the other part is the non-protruding part 112.
[0039] It can be understood that after the penetrating part 121 of the tab assembly 120 is connected inside the battery core body 110, the battery core body 110 is extruded along the thickness direction of the tab assembly 120, so that the battery core body 110 is compressed and deformed until the two sides of the penetrating part 121 along the thickness direction are pressed. Due to the existence of the penetrating part 121, the part of the battery core body 110 corresponding to the penetrating part 121 will be protruded due to the support of the penetrating part 121. In this application, the part of the battery core body 110 supported by the penetrating part 121 and protruding from the surface is defined as the protruding part 111, and the other part not supported by the penetrating part 121 and not protruding from the surface is the non-protruding part 112.
[0040] In combination with Figure 1 With Figure 2 The aluminum plastic film 200 is wrapped outside the battery core body 110, and the aluminum plastic film 200 is used to protect the battery core body 110. The aluminum plastic film 200 includes a first covering part 210 and a second covering part 220, the thickness of the first covering part 210 is less than the thickness of the second covering part 220, the first covering part 210 covers the surface of the protruding part 111, and the second covering part 220 covers the surface of the non-protruding part 112.
[0041] It can be understood that the aluminum plastic film 200 is thinned at the portion corresponding to the protruding portion 111, so that when the entire aluminum plastic film 200 is wrapped around the battery core body 110, the problem of thickness difference of the battery caused by the protruding portion 111 can be improved, thereby facilitating the reduction of the risk of affecting the formation interface due to the force difference between different positions of the battery in the subsequent formation process. At the same time, by improving the problem of thickness difference of the battery caused by the protruding portion 111, after injecting electrolyte into the battery core 100, the problem of electrolyte accumulation around the protruding portion 111 can be improved.
[0042] As shown in Figure 1 , Figure 2 , the inner side of the aluminum plastic film 200 is thinned to form a first covering portion 210 corresponding to the protruding portion 111, wherein the inner side of the aluminum plastic film 200 is the side of the aluminum plastic film 200 close to the battery core body 110.
[0043] It can be understood that by thinning the inner side of the aluminum plastic film 200, the thickness of the first covering portion 210 is less than the thickness of the second covering portion 220, so that the structure of the outer side of the entire aluminum plastic film 200 is not affected, which is beneficial to improve the appearance efficiency.
[0044] Specifically, the outer side of the first covering portion 210 is connected with the outer side of the second covering portion 220 flatly, that is, the joint between the outer side of the first covering portion 210 and the outer side of the second covering portion 220 does not appear uneven. Wherein the outer side of the aluminum plastic film 200 is the side of the aluminum plastic film 200 away from the battery core body 110. By thinning the inner side of the aluminum plastic film 200, the thickness of the first covering portion 210 is less than the thickness of the second covering portion 220, so that the flatness of the outer side of the aluminum plastic film 200 is not affected.
[0045] As shown in Figure 3 , in some embodiments, the thickness T1 of the first covering portion 210 is defined, the thickness T2 of the second covering portion 220, and the protruding height H1 of the protruding portion 111 relative to the non-protruding portion 112; satisfy: T2-T1=H1. In this way, when the aluminum plastic film 200 is covered on the battery core body 110, and the first covering portion 210 covers the surface of the protruding portion 111, and the second covering portion 220 covers the surface of the non-protruding portion 112, the thickness of the entire battery at different positions can be the same.
[0046] Of course, in other embodiments, the value of (T2-T1) and the value of H1 can also have a difference within the error allowable range.
[0047] In combination with Figure 2 and Figure 3Further, the protrusion 111 includes a first protrusion 111a and a second protrusion 111b arranged along the thickness direction of the battery cell 100 and oppositely arranged, and the first covering portion 210 includes a first covering portion A 210a covering the surface of the first protrusion 111a and a first covering portion B 210b covering the surface of the second protrusion 111b.
[0048] It can be understood that after the penetrating portion 121 of the tab assembly 120 is connected inside the battery cell body 110, the battery cell body 110 is extruded along the thickness direction of the penetrating portion 121, so that the battery cell body 110 is compressed and deformed until the two sides of the penetrating portion 121 along the thickness direction are pressed. Due to the existence of the penetrating portion 121, the portions corresponding to the penetrating portion 121 on both sides of the battery cell body 110 along the thickness direction are protruded due to the support of the penetrating portion 121. Among the two sides of the battery cell body 110 along the thickness direction, the protrusion on one side of the battery cell body 110 is the first protrusion 111a, and the protrusion on the other side of the battery cell body 110 is the second protrusion 111b. The aluminum plastic film 200 is thinned corresponding to the portions covering the first protrusion 111a and the second protrusion 111b, wherein the aluminum plastic film 200 corresponding to the surface of the first protrusion 111a is the first covering portion A 210a, and the aluminum plastic film 200 corresponding to the surface of the second protrusion 111b is the first covering portion B 210b.
[0049] The thickness of the first covering portion A 210a is defined as T 1a , the thickness of the first covering portion B 210b is T 1b , the thickness of the second covering portion 220 is T2, and the thickness of the penetrating portion 121 is T3; wherein the thickness direction of the penetrating portion 121 is parallel to the thickness direction of the battery cell 100; and (T2-T 1a )+(T2-T 1b )=T3. In this way, when the aluminum plastic film 200 covers the battery cell body 110, and the first covering portion A 210a covers the surface of the first protrusion 111a, the first covering portion B 210b covers the surface of the second protrusion 111b, and the second covering portion 220 covers the surface of the non-protrusion portion 112, the thickness of each position of the entire battery can be made the same.
[0050] Of course, in other embodiments, the value of (T2-T 1a )+(T2-T 1b ) and the value of (T2-T 1b ) can also have differences within the error allowable range.
[0051] In some embodiments, the first protrusion 111a and the second protrusion 111b are symmetrically arranged relative to a symmetry plane, and the first cover portion A 210a and the first cover portion B 210b are also symmetrically arranged relative to the symmetry plane; the thickness of the first cover portion A 210a and the first cover portion B 210b is defined as T 1c , the thickness T2 of the second cover portion 220, and the thickness of the penetrating portion 121 is T3; wherein the thickness direction of the penetrating portion 121 is parallel to the thickness direction of the battery cell 100; and T2-T 1c =T3 / 2 is satisfied.
[0052] In combination Figure 2 With Figure 3 It should be noted that the tab assembly 120 includes the tab 120a and the tab adhesive 120b arranged on the tab 120a, wherein at least part of the tab 120a and at least part of the tab adhesive 120b are penetrated into the battery cell body 110.
[0053] It can be understood that the tab 120a is attached with the tab adhesive 120b, at least part of the tab 120a is penetrated into the battery cell body 110, and at least part of the tab adhesive 120b is also penetrated into the battery cell body 110; wherein the penetrating portion 121 includes the tab 120a located in the battery cell body 110 and the tab adhesive 120b located in the battery cell body 110.
[0054] The utility model also provides a kind of electric equipment, including the battery as described above.
[0055] The electric equipment of the utility model has the above-mentioned battery, in the battery, the aluminum-plastic film 200 is thinned in the part corresponding to the cover protrusion 111, so that, when the entire aluminum-plastic film 200 is wrapped in the battery cell body 110, the problem of thickness difference caused by the protrusion 111 of the battery can be improved, thereby facilitating the reduction of the risk of affecting the formation interface due to the force difference in each part of the battery in the subsequent formation process. At the same time, by improving the problem of thickness difference caused by the protrusion 111 of the battery, after injecting electrolyte into the battery cell 100, the problem of liquid expansion caused by the accumulation of electrolyte around the protrusion 111 can be improved.
[0056] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "illustrative embodiment", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.
[0057] Although the embodiments of the present application have been shown and described, it should be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the claims and their equivalents.
Claims
1. A battery, characterized by The battery comprises: an electric core, comprising an electric core body and a tab assembly, the tab assembly comprising a penetrating part penetrating in the electric core body; wherein a part of the electric core body, which is supported by the penetrating part and protrudes from the surface, is defined as a protruding part, and other parts are defined as non-protruding parts; an aluminum plastic film, wrapped outside the electric core body, comprising a first covering part and a second covering part, the thickness of the first covering part is less than the thickness of the second covering part, the first covering part covers the surface of the protruding part, and the second covering part covers the surface of the non-protruding part.
2. The battery of claim 1, wherein, The inner side of the aluminum plastic film is thinned to form the first covering part, wherein the inner side of the aluminum plastic film is the side of the aluminum plastic film close to the electric core body.
3. The battery of claim 1, wherein, The outer side of the first covering part is connected with the outer side of the second covering part flatly, wherein the outer side of the aluminum plastic film is the side of the aluminum plastic film away from the electric core body.
4. The battery of claim 1, wherein, The thickness of the first covering part is defined as T1, the thickness of the second covering part is defined as T2, and the protruding height of the protruding part relative to the non-protruding part is defined as H1; it is satisfied that T2-T1=H1.
5. The battery of claim 1, wherein, The protruding part comprises a first protruding part and a second protruding part arranged in the thickness direction of the electric core and arranged oppositely, the first covering part comprises a first covering part A covering the surface of the first protruding part and a first covering part B covering the surface of the second protruding part.
6. The battery of claim 5, wherein, The thickness of the first covering portion A is defined as T 1a The thickness of the first covering portion B is defined as T 1b The thickness of the second covering portion is defined as T2, and the thickness of the penetrating portion is defined as T3; wherein the thickness direction of the penetrating portion is parallel to the thickness direction of the battery cell. satisfies: (T2-T 1a ) + (T2-T 1b ) = T3.
7. The battery of claim 5, wherein, The first protruding part and the second protruding part are symmetrically arranged relative to a symmetry plane, and the first covering part A and the first covering part B are also symmetrically arranged relative to the symmetry plane; the thicknesses of the first covering part A and the first covering part B are defined as T 1c , the thickness T2 of the second covering part, and the thickness T3 of the penetrating part; wherein the thickness direction of the penetrating part is parallel to the thickness direction of the battery cell. Satisfies: T2-T 1c = T3 / 2.
8. The battery of claim 1, wherein, The tab assembly comprises a tab and a tab rubber arranged on the tab, wherein at least part of the tab and at least part of the tab rubber penetrate in the electric core body.
9. The battery of claim 1, wherein, The electric core body is in a winding structure, and the penetrating part penetrates in the central space formed by the winding structure.
10. An electric device, characterized by The battery comprises the battery as claimed in any one of claims 1 to 9.