Battery monomer and battery
By using limiting parts in lithium-ion batteries to position the electrode assembly, the problem of pit formation in mold stamping is solved, and the safety and service life of the battery are improved.
Patent Information
- Application Number
- CN202420338893.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-02-23
- Publication Date
- 2025-02-11
- Estimated Expiration
- 2034-02-23
AI Technical Summary
In the manufacturing process of lithium-ion batteries, the method of forming pits by mold stamping can easily cause damage to the PP layer of the aluminum-plastic film, which in turn affects the service life of the battery.
The electrode assembly is positioned using a limiting member instead of forming a pit by stamping aluminium-plastic film to avoid damage to the PP layer.
Through the use of the limiting parts, the safety performance and service life of the battery are improved, and the damage and electrochemical corrosion of the PP layer are avoided.
Smart Images
Figure CN222463115U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of lithium-ion batteries, and in particular to a battery cell and a battery. Background Art
[0002] Lithium-ion batteries commonly include soft-pack batteries and square-shell batteries. The basic structure of the aluminum-plastic film of the soft-pack battery is the outer Nylon layer, the Al layer and the PP layer from the inside to the outside. The Nylon layer blocks the penetration of air, especially oxygen, and protects the Al layer; the middle Al layer prevents water vapor from penetrating into the interior of the electrode assembly and has a certain puncture resistance; the PP layer is resistant to electrolyte corrosion, avoids contact between the Al layer and the electrolyte, and plays a melting seal function.
[0003] In the production process of lithium-ion batteries, the aluminum-plastic film is first punched into a pit using a mold, and then the battery cell is placed in the pit, and then the edge is sealed. However, the process of using the mold to punch the pit is easy to cause the PP layer to be damaged, thus forming an electron path, causing electrochemical corrosion of the aluminum-plastic film, and thus affecting the service life of the lithium-ion battery.
[0004] Therefore, there is an urgent need for a battery cell and a battery that can solve the technical problems existing in the prior art to a certain extent. Utility Model Content
[0005] The purpose of the present application is to provide a battery cell and a battery, which limit the electrode assembly by a limiter, instead of forming the limit on the electrode assembly by stamping an aluminum-plastic film, thereby improving the situation of PP layer damage and further improving the safety performance and service life of the electrode assembly.
[0006] The present application provides a battery cell, comprising:
[0007] The shell is sealed with aluminum-plastic film to form a containing space;
[0008] A limiting member is arranged in the housing and is surrounded by the aluminum-plastic film to form a limiting space; and
[0009] The electrode assembly comprises a pole piece body and a pole ear extending from the pole piece body along a first direction; the pole piece body is arranged in the limiting space, and the pole ear extends from the limiting space to the outside of the aluminum-plastic film;
[0010] The limiting part and the pole piece body are encapsulated in an aluminum-plastic film.
[0011] Optionally, the limiting member includes a first limiting block and a second limiting block spaced apart along the second direction, the pole piece body is located between the first limiting block and the second limiting block, and the second direction is perpendicular to the first direction.
[0012] Optionally, the distance between the first limit block and the second limit block is greater than the length of the pole piece body.
[0013] Optionally, the limiting member further includes a third limiting block, and the first limiting block, the third limiting block, and the second limiting block are connected end to end in sequence for positioning the electrode assembly.
[0014] Optionally, the limiting member further includes a fourth limiting block, and the first limiting block, the fourth limiting block, and the second limiting block are connected end to end in sequence.
[0015] Optionally, the third limiting block is perpendicular to the first limiting block and the second limiting block respectively;
[0016] and / or, the fourth limiting block is perpendicular to the first limiting block and the second limiting block respectively.
[0017] Optionally, the pole piece body has a flat area and a bent area connecting the flat areas. The third limiting block includes a main body portion and a first extending portion. The first extending portion extends from the bottom end of the main body portion into the limiting space, and the end face of the first extending portion is an arc surface that fits the bent area.
[0018] Optionally, the thickness of the electrode assembly is h, and the height of the third limiting block and / or the fourth limiting block in the thickness direction of the electrode assembly is X1. h and X1 satisfy the following relationship:
[0019] 1 / 2h ≤ X1 ≤ h.
[0020] Optionally, the housing is formed by folding an aluminum-plastic film to form a housing with three sealed edges. The limiting member is in a "C" shape, and the open end of the limiting member along the second direction is located at the folding position of the aluminum-plastic film.
[0021] This application also provides a battery cell, including the above battery cell.
[0022] Compared with the prior art, the beneficial effects of this application are as follows:
[0023] This application positions the electrode assembly by using a limiting member, and does not need to use a stamping pit for positioning the electrode assembly, solving the technical problem that when using a die to stamp a pit on an aluminum-plastic film and using the pit to position the electrode assembly, the PP layer is damaged, and improving the safety and service life of the battery.
[0024] This application also provides a battery, including the above battery cell. Therefore, it has all the beneficial effects of the above battery and will not be specifically elaborated here. Description of the Drawings
[0025] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.
[0026] FIG1 is a schematic diagram of the structure of a battery provided in Example 1 of the present application at a first viewing angle;
[0027] Figure 2 A schematic diagram of the structure of a battery hidden electrode assembly provided in Example 1 of the present application;
[0028] Figure 3 A schematic diagram of the structure of a limiting member in a battery provided in Example 1 of the present application;
[0029] Figure 4 A schematic diagram of the structure of an electrode assembly in a battery provided in Example 1 of the present application;
[0030] Figure 5 A schematic diagram of the structure of the battery provided in Example 1 of the present application at a second viewing angle;
[0031] Figure 6 for Figure 5 Enlarged view of point A in the middle;
[0032] Figure 7 A schematic diagram of the structure of the battery provided in Example 1 of the present application at a third viewing angle;
[0033] Figure 8 for Figure 7 Enlarged view of point C in the middle;
[0034] Fig. 9 A schematic diagram of the structure of the battery provided in Example 1 of the present application at a fourth viewing angle, and a cross-sectional view of the battery;
[0035] Fig.10 for Fig. 9 Enlarged view of point B in the middle;
[0036] Fig.11 A schematic diagram of the structure of a battery provided in Example 1 of the present application;
[0037] Fig.12 This is a schematic diagram of the structure of a limiting member in a battery provided in Example 2 of the present application.
[0038] Figure markings: 1-electrode assembly; 2-ear; 3-first limit block; 4-second limit block; 5-limiting space; 6-fixing area; 7-third limit block; 8-main body; 9-first extension part; 10-straight area; 11-bending area; 12-winding area; 13-covering area; 14-center line of winding area; 15-arc surface; 16-fourth limit block; 17-preset gap; 18-aluminum-plastic film; 19-limiting member; Z-thickness direction of electrode assembly; X-width direction of electrode assembly; Y-length direction of electrode assembly. DETAILED DESCRIPTION
[0039] The following specific embodiments are provided to help the reader obtain a comprehensive understanding of the methods, devices and / or systems described herein. However, after understanding the disclosure of the present application, various changes, modifications and equivalents of the methods, devices and / or systems described herein will be apparent. For example, the order of operations described herein is merely an example, and is not limited to the order set forth herein, but in addition to the operations that must occur in a particular order, changes that will be apparent after understanding the disclosure of the present application may be made. In addition, in order to improve clarity and brevity, descriptions of features known in the art may be omitted.
[0040] The features described herein may be implemented in different forms and should not be interpreted as being limited to the examples described herein. Rather, the examples described herein have been provided only to illustrate some of the many possible ways of implementing the methods, devices and / or systems described herein that will be apparent after understanding the disclosure of the present application.
[0041] Throughout the specification, when an element (such as a layer, a region, or a substrate) is described as being “on”, “connected to”, “bound to”, “over”, or “covering” another element, it may be directly “on”, “connected to”, “bound to”, “over”, or “covering” another element, or one or more other elements may be present between them. In contrast, when an element is described as being “directly on”, “directly connected to”, “directly bound to”, “directly over”, or “directly covering” another element, there may be no other elements present between them.
[0042] As used herein, the term "and / or" includes any one of the associated listed items and any combination of any two or more items.
[0043] Although terms such as "first," "second," and "third" may be used herein to describe various members, components, regions, layers, or portions, these members, components, regions, layers, or portions are not limited by these terms. Rather, these terms are only used to distinguish one member, component, region, layer, or portion from another member, component, region, layer, or portion. Therefore, without departing from the teachings of the examples described herein, the first member, component, region, layer, or portion referred to may also be referred to as the second member, component, region, layer, or portion.
[0044] For ease of description, spatial relational terms such as "above", "upper", "below", and "lower" may be used herein to describe the relationship of one element to another element as shown in the accompanying drawings. Such spatial relational terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the accompanying drawings. For example, if the device in the accompanying drawings is turned over, an element described as being "above" or "upper" relative to another element will subsequently be located "below" or "lower" relative to the other element. Therefore, the term "above" includes both "above" and "below" orientations depending on the spatial orientation of the device. The device may also be positioned in other ways (e.g., rotated 90 degrees or in other orientations), and the spatial relational terms used herein will be interpreted accordingly.
[0045] The terms used herein are only used to describe various examples and are not used to limit the present disclosure. Unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. The terms "include", "comprise" and "have" list the stated features, quantities, operations, components, elements and / or their combinations that exist, but do not exclude the existence or addition of one or more other features, quantities, operations, components, elements and / or their combinations.
[0046] Variations in the shapes shown in the drawings may occur due to manufacturing techniques and / or tolerances. Therefore, the examples described herein are not limited to the specific shapes shown in the drawings but include variations in shapes that occur during manufacturing.
[0047] The features of the examples described herein may be combined in various ways that will be apparent after understanding the disclosure of the present application. In addition, although the examples described herein have various configurations, other configurations are possible as will be apparent after understanding the disclosure of the present application.
[0048] Embodiment 1
[0049] Combine the following Figure 1-Figure 10 A battery cell provided in this embodiment is described in detail.
[0050] At present, in the process of manufacturing lithium-ion battery cells, the aluminum-plastic film 18 is firstly formed into a pit by die stamping, and then the electrode assembly 1 is placed in the pit, and the electrode assembly 1 is positioned by the pit; however, the process of using the die stamping to form the pit is prone to cause the PP layer to be damaged, thereby forming an electron path, causing the aluminum-plastic film 18 to be electrochemically corroded, thereby affecting the service life of the lithium-ion battery cell. In this embodiment, a battery cell is provided, which can just solve the above-mentioned problems in the prior art. In this embodiment, die stamping is not used, and the problem of PP layer damage is fundamentally solved, thereby improving the safety and service life of the battery cell.
[0051] Specifically, the battery cell includes a shell, an electrode assembly 1, and a limiter 19. The shell is sealed with an aluminum-plastic film 18 to form an accommodating space. The limiter 19 is arranged in the shell and is surrounded by the aluminum-plastic film 18 to form a limiter space. The electrode assembly 1 includes a pole piece body and a pole ear 2 extending from the pole piece body along a first direction. The pole piece body is arranged in the limiter space, and the pole ear 2 extends from the limiter space to the outside of the aluminum-plastic film 18. Among them, the limiter 19 and the pole piece body are encapsulated in the aluminum-plastic film 18.
[0052] The present application adopts a limiter 19 to position the electrode assembly 1, preventing the electrode assembly 1 from moving in the limited space, thereby achieving the positioning of the electrode assembly 1. It is not necessary to use a stamping pit to position the electrode assembly 1, which solves the technical problem of using a mold to stamp a pit on the aluminum-plastic film, and damaging the PP layer when the pit is used to position the electrode assembly, thereby improving the safety and service life of the battery.
[0053] In this embodiment, combined Figure 2 As shown, the limiting member 19 includes a first limiting block 3 and a second limiting block 4 spaced apart along the second direction, the pole piece body is located between the first limiting block 3 and the second limiting block 4, and the second direction is perpendicular to the first direction.
[0054] Specifically, combined Figure 2 and Figure 4 As shown, the first limit block 3 and the second limit block 4 are both arranged at intervals along the length direction Y of the electrode assembly. A limit space 5 capable of accommodating the electrode assembly 1 is formed between the first limit block 3 and the second limit block 4. Preferably, the first limit block 3 and the second limit block 4 are both in a strip structure.
[0055] Specifically, the first limiting block 3 and the second limiting block 4 are arranged in parallel, that is, the first limiting block 3 and the second limiting block 4 extend along the width direction X of the electrode assembly (the thickness direction Z of the electrode assembly); the distance between the first limiting block 3 and the second limiting block 4 is greater than the length of the electrode sheet body, that is, the length of the limiting space 5 formed between the first limiting block 3 and the second limiting block 4 in the length direction Y of the electrode assembly is greater than the length of the electrode assembly 1. With such a setting, a preset gap 17 can be formed between the electrode assembly 1 and the first limiting block 3, or a preset gap 17 can be formed between the electrode assembly 1 and the second limiting block 4, or preset gaps 17 can be formed between the electrode assembly 1 and the first limiting block 3 and the second limiting block 4 respectively. The above-mentioned preset gap 17 facilitates the installation of the electrode assembly 1 in the limiting space 5 and prevents the performance of the electrode assembly 1 from being affected when the electrode assembly 1 touches the limiting member 19 during the installation in the limiting space 5.
[0056] In this embodiment, as shown in Figure 2 , the limiting member 19 further includes a third limiting block 7. The first limiting block 3, the third limiting block 7, and the second limiting block 4 are connected end to end in sequence for positioning the electrode assembly.
[0057] Specifically, as shown in Figure 3 , the third limiting block 7 is respectively vertically connected to the first limiting block 3 and the second limiting block 4. The third limiting block 7 extends along the length direction Y of the electrode assembly. The limiting space 5 enclosed by the first limiting block 3, the second limiting block 4, and the third limiting block 7 is in a "C" shape. The first limiting block 3 and the second limiting block 4 are used to position the two ends of the electrode assembly 1 in its length direction, and the third limiting block 7 is used to position the electrode assembly 1 in the width direction.
[0058] In this embodiment, as shown in Figure 4-Figure 8 , in Figure 4 , an electrode assembly 1 with a wound structure is given. The electrode sheet body has a flat area 10 and a bent area 11 connecting the flat area 10. The third limiting block 7 includes a main body portion 8 and a first extending portion 9. The first extending portion 9 extends from the bottom end of the main body portion 8 into the limiting space. The end face of the first extending portion 9 is an arc surface that fits the bent area 11. The arc surface 15 matches the bending radian of the bent area 11, that is, when the first extending portion 9 abuts against the bent area 11, the positioning of the electrode assembly 1 in its width direction can be achieved. Preferably, the main body portion 8 is in a long strip shape.
[0059] Specifically, as shown in Figure 7 and Figure 8 , the thickness of the electrode assembly 1 is h, and the height of the third limiting block 7 and / or the fourth limiting block 16 in the thickness direction of the electrode assembly 1 is X1. The relationship between h and X2 is as follows:
[0060] 1 / 2h≤X1≤h.
[0061] That is, the maximum height of the main body 8 is the thickness of the electrode assembly 1 , and the minimum height is half of the thickness of the electrode assembly 1 .
[0062] It is worth noting that: the structure of the first limit block 3 and the second limit block 4 may also include a main body 8 and a first extension 9 vertically connected to the bottom end of the main body 8. The first extension 9 on the first limit block 3 and the second limit block 4 can respectively abut against the side wall on the width of the electrode assembly 1 to prevent the electrode assembly 1 from moving in the length direction Y of the electrode assembly. In addition, the height of the first extension 9 on the first limit block 3 and the second limit block 4 also satisfies the above formula.
[0063] In this embodiment, combined with Figure 2 , Fig. 9 and Fig.10 As shown, the aluminum-plastic film 18 includes a fixing area 6, a winding area 12 and a cover area 13 connected in sequence, and the cover area 13, the fixing area 6 and the winding area 12 together form a limiting space for sealing the electrode assembly 1; in the actual sealing process, the limiting member 19 is first placed and fixed in the fixing area 6; then the electrode assembly 1 is placed in the limiting space 5 formed by the limiting member 19; finally, the cover area 13 is placed around the right end of the electrode assembly 1 toward the left end of the electrode assembly 1 and covers the upper surface of the electrode assembly 1, and the end of the cover area 13 overlaps the fixing area 6, so that the cover area 13, the fixing area 6 and the winding area 12 together form a limiting space for sealing the electrode assembly 1. The battery cell finally formed is as shown in FIG. Fig.11 shown.
[0064] Specifically, the fixing area 6, the winding area 12 and the covering area 13 are laid out in sequence, and the distance from the end of the first limit block 3 away from the third limit block 7 to the center line 14 of the winding area is X1, then h and X1 satisfy the following relationship:
[0065] X1=1 / 4π*h.
[0066] Furthermore, for the second limiting block 4, the distance from the end of the second limiting block 4 away from the third limiting block 7 to the center line 14 of the winding area also satisfies the above relationship.
[0067] Embodiment 2
[0068] In this embodiment, combined with Fig.12 As shown, the limiting member 19 further includes a fourth limiting block 16 , and the first limiting block 3 , the second limiting block 4 , the third limiting block 7 and the fourth limiting block 16 are sequentially connected end to end to limit the battery cell 1 within the limiting space 5 .
[0069] Specifically, the limiting space 5 is a rectangular limiting space 5 .
[0070] Specifically, in this embodiment, the aluminum-plastic film 18 includes two independent parts, namely, a fixing area 6 and a covering area, and the process of forming a battery cell is as follows: first, the first limiting block 3, the second limiting block 4, the third limiting block 7 and the fourth limiting block 16 are placed in the fixing area 6; then, the battery cell 1 is placed in the limiting space 5 surrounded by the first limiting block 3, the second limiting block 4, the third limiting block 7 and the fourth limiting block 16; finally, the covering area is covered on the top surface of the battery cell 1, and the surrounding areas of the covering area are overlapped on the surrounding areas of the fixing area 6.
[0071] In summary, in this embodiment, the battery cell 1 is positioned by a limit member 19, specifically, the battery cell 1 is positioned by a limit space 5 surrounded by a first limit block 3, a second limit block 4, a third limit block 7 and a fourth limit block 16. Similarly, there is no need to use a stamped pit to position the battery cell 1, which solves the technical problem of damaging the PP layer when the existing mold stamped pits are used to position the battery cell 1 using the pits.
[0072] Embodiment 3
[0073] The present application also provides an electrical device, including the above-mentioned battery cell, and thus has all the beneficial effects of the above-mentioned battery cell, which will not be elaborated in detail here.
[0074] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.
Claims
1. A battery cell, characterized in that: Comprising: A housing formed by sealing the edges of an aluminum-plastic film (18) to form a receiving space; A limiting member (19) disposed within the housing and enclosing a limiting space together with the aluminum-plastic film (18); And An electrode assembly (1) including a pole piece body and a tab extending from the pole piece body in a first direction; the pole piece body is disposed within the limiting space, and the tab extends out of the limiting space to the outside of the aluminum-plastic film (18); Wherein, the limiting member (19) and the pole piece body are encapsulated within the aluminum-plastic film (18).
2. The battery cell according to claim 1, characterized in that: The limiting member (19) includes a first limiting block (3) and a second limiting block (4) spaced apart along a second direction, the pole piece body is located between the first limiting block (3) and the second limiting block (4), and the second direction is perpendicular to the first direction.
3. The battery cell according to claim 2, characterized in that: The distance between the first limiting block (3) and the second limiting block (4) is greater than the length of the pole piece body.
4. The battery cell according to claim 2, characterized in that: The limiting member (19) further includes a third limiting block (7), and the first limiting block (3), the third limiting block (7), and the second limiting block (4) are connected end to end in sequence for positioning the electrode assembly.
5. The battery cell according to claim 4, characterized in that: The limiting member (19) further includes a fourth limiting block (16), and the first limiting block (3), the fourth limiting block (16), and the second limiting block (4) are connected end to end in sequence.
6. The battery cell according to claim 5, characterized in that: The third limiting block (7) is perpendicular to the first limiting block (3) and the second limiting block (4) respectively; And / or, the fourth limiting block (16) is perpendicular to the first limiting block (3) and the second limiting block (4) respectively.
7. The battery cell according to claim 5, characterized in that: The pole piece body has a flat region (10) and a bent region (11) connecting the flat region (10), the third limiting block (7) includes a main body portion (8) and a first extending portion (9), the first extending portion (9) extends into the limiting space from the bottom end of the main body portion (8), and the end face (15) of the first extending portion (9) is an arc surface fitting the bent region (11).
8. The battery cell according to claim 5, characterized in that: The thickness of the electrode assembly (1) is h, and the height of the third limiting block (7) and / or the fourth limiting block (16) in the thickness direction of the electrode assembly (1) is X1, and h and X1 satisfy the following relationship: 1 / 2h ≤ X1 ≤ h.
9. The battery cell according to claim 4, characterized in that: The housing is formed by folding the aluminum-plastic film in half to form a housing with three sealed edges, the limiting member is in a "C" shape, and the open end of the limiting member along the second direction is located at the folding position of the aluminum-plastic film.
10. A battery, characterized in that: Including the battery cell according to any one of claims 1 to 9.