Battery cell and battery pack
By connecting to the side end covers at both ends of the electrode assembly, the problem of the pole ear tear when the battery cell is placed vertically is solved, and the performance of the battery is improved.
Patent Information
- Application Number
- CN202422351341.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-25
- Publication Date
- 2025-09-02
- Estimated Expiration
- 2034-09-25
AI Technical Summary
When the battery cell is placed vertically on the side, the electrode assembly on the non-pole ear side moves downward due to its own gravity, causing the electrode ear to tear, affecting the battery performance.
By connecting to the first side end cover at the first side end of the electrode assembly, the second side end is connected to the second side end cover, and the two ends of the electrode assembly in the length direction are fixed to prevent the electrode assembly from tilting due to gravity.
Effectively avoid extreme ear tearing and improve battery performance.
Smart Images
Figure CN223297011U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of battery technology, and in particular to a battery cell and a battery pack. Background Art
[0002] A battery cell includes a housing and an electrode assembly disposed within the housing, which is connected to a tab. When a conventional battery with terminals on the same side is placed on its side, the end cap on the side where the electrode assembly is connected to the tab is called the tab side, while the side of the electrode assembly without a tab is called the non-tab side.
[0003] Since the electrode assembly is not constrained by external forces, the non-tab side of the electrode assembly is easily affected by its own gravity and tilted downward, and will pull the tab, causing the tab to easily tear, and even causing the risk of lithium plating in the battery cell, affecting the performance of the battery cell. Utility Model Content
[0004] The purpose of the present application is to provide a battery cell and a battery pack to solve the technical problem that when the battery cell is placed on its side, the electrode assembly on the non-tab side moves downward due to its own gravity, causing the tab to tear and affecting the performance of the battery cell.
[0005] On the one hand, the present application provides a battery cell, comprising: a shell having a cavity and a first opening and a second opening connected to the cavity; a first side end cover, arranged on the first opening; a second side end cover, arranged on the second opening; and an electrode assembly, arranged in the cavity, the electrode assembly having a first side end and a second side end that are opposite to each other; wherein, the first side end is connected to a first positive electrode tab group and a first negative electrode tab group, and the first positive electrode tab group and the first negative electrode tab group are spaced apart in the height direction of the battery cell, and the second side end is connected to a second positive electrode tab group and a second negative electrode tab group, and the second positive electrode tab group and the second negative electrode tab group are spaced apart in the height direction of the battery cell; the first positive electrode tab group and the first negative electrode tab group are both connected to the first side end cover, and the second positive electrode tab group and the second negative electrode tab group are both connected to the second side end cover.
[0006] In some embodiments, the electrode assembly includes multiple positive electrode sheets, multiple negative electrode sheets, and multiple separators. The positive electrode sheets and the negative electrode sheets are stacked, and the separators are arranged between adjacent positive electrode sheets and negative electrode sheets; the first side ends of the multiple positive electrode sheets are connected to the first positive electrode tab group, and the second side ends are connected to the second positive electrode tab group; the first side ends of the multiple negative electrode sheets are connected to the first negative electrode tab group, and the second side ends are connected to the second negative electrode tab group.
[0007] In some embodiments, the first positive tab group includes a plurality of first positive tabs, which are stacked along the width direction of the battery cell; the second positive tab group includes a plurality of second positive tabs, which are stacked along the width direction of the battery cell, wherein the first side end of each positive electrode sheet is connected to the first positive tab, and the second side end is connected to the second positive tab; the first negative tab group includes a plurality of first negative tabs, which are stacked along the width direction of the battery cell; the second negative tab group includes a plurality of second negative tabs, which are stacked along the width direction of the battery cell, wherein the first side end of each negative electrode sheet is connected to the first negative tab, and the second side end is connected to the second negative tab.
[0008] In some embodiments, the height of the second positive electrode tab is smaller than the height of the first positive electrode tab; and the height of the second negative electrode tab is smaller than the height of the first negative electrode tab.
[0009] In some embodiments, the first positive tab group and the second positive tab group are symmetrically arranged in the height direction of the battery cell; the first negative tab group and the second negative tab group are symmetrically arranged in the height direction of the battery cell.
[0010] In some embodiments, the first positive tab group and the second positive tab group are symmetrically arranged about the center of the housing; and the first negative tab group and the second negative tab group are symmetrically arranged about the center of the housing.
[0011] In some embodiments, the battery cell further includes: a first electrode, disposed on the first side end cover; the first electrode includes a first positive electrode and a first negative electrode, the first positive electrode is connected to the first positive electrode group, and the first negative electrode is connected to the first negative electrode group; the second positive electrode group and the second negative electrode group are both connected to the second side end cover by welding.
[0012] In some embodiments, the battery cell further includes: a first pole, disposed on the first side end cover; and a second pole, disposed on the second side end cover.
[0013] In some embodiments, the first electrode column includes a first positive electrode column and a first negative electrode column, the first positive electrode column is connected to the first positive electrode tab group, and the first negative electrode column is connected to the first negative electrode tab group; the second electrode column includes a second positive electrode column and a second negative electrode column, the second positive electrode column is connected to the second positive electrode tab group, and the second negative electrode column is connected to the second negative electrode tab group.
[0014] On the other hand, the present application also provides a battery pack, comprising at least two of the above-mentioned battery cells, wherein the at least two battery cells are connected in series and parallel.
[0015] The technical effect of the present invention is that by connecting the pole ear at the first side end of the electrode assembly to the first side end cover, and connecting the pole ear at the second side end to the second side end cover, the two ends of the electrode assembly in the length direction are fixedly connected, which can prevent the electrode assembly from tilting due to its own gravity, prevent the pole ear from tearing, and improve the performance of the battery. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] The following detailed description of the specific embodiments of the present application in conjunction with the accompanying drawings will make the technical solutions and other beneficial effects of the present application apparent.
[0017] Figure 1 It is a conventional battery cell structure.
[0018] Figure 2 Schematic diagram of the structure of the battery cell provided in the embodiment of the present application Figure 1 .
[0019] Figure 3 A schematic structural diagram of the housing provided in an embodiment of the present application.
[0020] Figure 4 Schematic diagram of the structure of the electrode assembly provided in the embodiment of the present application Figure 1 .
[0021] Figure 5 for Figure 4 Provided is a cross-sectional view along the AA direction.
[0022] Figure 6 Schematic diagram of the structure of the battery cell provided in the embodiment of the present application Figure 2 .
[0023] Figure 7 Schematic diagram of the structure of the electrode assembly provided in the embodiment of the present application Figure 2 .
[0024] Figure 8 Schematic diagram of the structure of the electrode assembly provided in the embodiment of the present application Figure 3 .
[0025] The components of the accompanying drawings are identified as follows:
[0026] 1 housing; 10 cavity; 101 first opening; 102 second opening; 11 first side end cover; 12 second side end cover;
[0027] 2 electrode assembly; 201 first side end; 202 second side end; 21 positive electrode sheet; 22 negative electrode sheet; 23 separator; 231 first bend; 232 second bend;
[0028] 31 first positive electrode ear group; 311 first positive electrode ear;
[0029] 32 first negative electrode ear group; 321 first negative electrode ear;
[0030] 33 second positive electrode ear group; 331 second positive electrode ear;
[0031] 34 second negative electrode ear group; 341 second negative electrode ear;
[0032] 4 first pole; 41 first positive pole; 42 first negative pole;
[0033] 5 second pole; 51 second positive pole; 52 second negative pole. DETAILED DESCRIPTION
[0034] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the embodiments described are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts are within the scope of protection of this application.
[0035] In the description of the present application, it should be understood that the terms "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present application, "multiple" means two or more, unless otherwise clearly and specifically defined.
[0036] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections, electrical connections, or mutual communication; they can refer to direct connections or indirect connections through an intermediate medium; they can refer to internal communication between two components or the interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.
[0037] In this application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.
[0038] like Figure 1 As shown, a typical battery cell includes a housing 1' and an electrode assembly 2' disposed within the housing 1'. The electrode assembly 2' is connected to the tabs 311' and 321'. When a conventional battery with terminals 41' and 42' on the same side is placed on its side, the end cap on the side where the electrode assembly 2' is connected to the tabs 311' and 321' is called the tab side, and the side of the electrode assembly without a tab is called the non-tab side.
[0039] To solve the technical problem that when a battery cell is placed on its side, the electrode assembly on the non-tab side moves downward due to its own gravity, causing the tab to tear and affecting the performance of the battery cell. The present invention provides a battery cell, comprising: a housing having a cavity and a first opening and a second opening connected to the cavity; a first side end cover disposed on the first opening; a second side end cover disposed on the second opening; and an electrode assembly disposed in the cavity, the electrode assembly having a first side end and a second side end facing away from each other; wherein the first side end is connected to a first positive tab group and a first negative tab group, the first positive tab group and the first negative tab group being spaced apart in the height direction of the battery cell; the second side end is connected to a second positive tab group and a second negative tab group, the second positive tab group and the second negative tab group being spaced apart in the height direction of the battery cell; the first positive tab group and the first negative tab group are both connected to the first side end cover, and the second positive tab group and the second negative tab group are both connected to the second side end cover. In this way, by connecting the electrode ear at the first side end of the electrode assembly to the first side end cover, and connecting the electrode ear at the second side end to the second side end cover, the two ends of the electrode assembly in the length direction are fixedly connected. This can prevent the electrode assembly from tilting due to its own gravity, prevent the electrode ear from tearing, and improve the performance of the battery.
[0040] like Figure 2As shown, an embodiment of the present application provides a battery cell having a first direction X, a second direction Y, and a third direction intersecting each other. The first direction X is the length direction of the battery cell, the second direction Y is the height direction of the battery cell, that is, the width direction of the electrode assembly 2, and the third direction (not shown) is a direction perpendicular to the first direction X and the second direction Y, which is the thickness direction of the battery cell, that is, the stacking direction of the electrode assembly 2.
[0041] like Figure 2 As shown, in some embodiments, the battery cell includes a housing 1 , a first side end cover 11 , a second side end cover 12 , and an electrode assembly 2 .
[0042] like Figure 2 or Figure 3 As shown, the housing 1 is positioned along a first direction X, with the length of the housing 1 parallel to the horizontal direction, i.e., the housing 1 is positioned horizontally. The housing 1 is generally square and has a cavity 10 and a first opening 101 and a second opening 102 communicating with the cavity 10. The first opening 101 is located at the left end of the housing 1, and the second opening 102 is located at the right end of the housing 1.
[0043] The first side cover 11 is provided on the first opening 101. It is understood that the first side cover 11 is installed at the left end of the housing 1 and closes the first opening 101. The shape of the first side cover 11 can be set according to the form of the first opening 101.
[0044] The second side end cover 12 is provided on the second opening 102. It is understandable that the second side end cover 12 is installed at the right end of the housing 1 and closes the second opening 102. The shape of the second side end cover 12 can be set according to the form of the second opening 102.
[0045] like Figure 2 As shown, the electrode assembly 2 is disposed in the cavity 10. The electrode assembly 2 has a first side end 201 and a second side end 202 that are separated from each other. The first side end 201 is the left side end of the electrode assembly 2, and the second side end 202 is the right side end of the electrode assembly 2.
[0046] like Figure 2 or Figure 4 As shown, the first side end 201 is connected to a first positive tab group 31 and a first negative tab group 32. The first positive tab group 31 and the first negative tab group 32 are spaced apart in the height direction of the battery cell. The first positive tab group 31 includes a plurality of first positive tabs 311, which are stacked along the thickness direction of the battery cell. The second positive tab group 33 includes a plurality of second positive tabs 331, which are stacked along the thickness direction of the battery cell.
[0047] A second positive tab group 33 and a second negative tab group 34 are connected to the second side end 202. The second positive tab group 33 and the second negative tab group 34 are spaced apart in the height direction of the battery cell. The first negative tab group 32 includes a plurality of first negative tabs 321 stacked along the thickness direction of the battery cell. The second negative tab group 34 includes a plurality of second negative tabs 341 stacked along the thickness direction of the battery cell.
[0048] like Figure 5 As shown, the electrode assembly 2 includes a plurality of positive electrode sheets 21, a plurality of negative electrode sheets 22, and a plurality of separators 23. The positive electrode sheets 21 and the negative electrode sheets 22 are stacked, and the separators 23 are arranged between adjacent positive electrode sheets 21 and negative electrode sheets 22. Specifically, the electrode assembly 2 can be a wound structure, that is, the separator 23 has a first curved portion 231 and a second curved portion 232 connected to each other, and the opening direction of the first curved portion 231 is opposite to the opening direction of the second curved portion 232. Among them, the positive electrode sheet 21 is arranged in the first curved portion 231, and the negative electrode sheet 22 is arranged in the second curved portion 232. In other embodiments, the electrode assembly 2 can be a laminated structure, that is, it is stacked in the order of positive electrode sheet 21, separator 23, negative electrode sheet 22, separator 23, positive electrode sheet 21...
[0049] like Figure 2 As shown, the first side end 201 of the plurality of positive electrode sheets 21 is connected to the first positive electrode tab group 31, and the second side end 202 is connected to the second positive electrode tab group 33. It is understandable that the positive electrode sheet 21 may include a first positive electrode sheet 21, a second positive electrode sheet 21, and a third positive electrode sheet 21, wherein the first side end 201 of the first positive electrode sheet 21 is connected to the first positive electrode tab 311, and the second side end 202 is connected to the second positive electrode tab 331. The first side end 201 of the second positive electrode sheet 21 is connected to the first positive electrode tab 311, and the second side end 202 is not connected to the tab. The first side end 201 of the third positive electrode sheet 21 is not connected to the tab, and the second side end 202 is connected to the second positive electrode tab 331. That is, in the electrode assembly 2, the positive electrode sheet 21 may be composed of the three positive electrode sheets 21 with different structures mentioned above. Optionally, in the electrode assembly 2 , the first side end 201 of each positive electrode sheet 21 is connected to the first positive electrode tab 311 , and the second side end 202 is connected to the second positive electrode tab 331 , so as to ensure the performance of the battery cell.
[0050] The first side ends 201 of the plurality of negative electrode sheets 22 are connected to the first negative electrode tab group 32, and the second side ends 202 are connected to the second negative electrode tab group 34. It is understood that the negative electrode sheets 22 may include a first negative electrode sheet 22, a second negative electrode sheet 22, and a third negative electrode sheet 22, wherein the first side end 201 of the first negative electrode sheet 22 is connected to the first negative electrode tab 321, and the second side end 202 is connected to the second negative electrode tab 341. The first side end 201 of the second negative electrode sheet 22 is connected to the first negative electrode tab 321, and the second side end 202 is not connected to the tab. The first side end 201 of the third negative electrode sheet 22 is not connected to the tab, and the second side end 202 is connected to the second negative electrode tab 341. In other words, in the electrode assembly 2, the negative electrode sheets 22 may be composed of the three different structures of negative electrode sheets 22 described above. Optionally, in the electrode assembly 2 , the first side end 201 of each negative electrode sheet 22 is connected to the first negative electrode ear 321 , and the second side end 202 is connected to the second negative electrode ear 341 . This improves the overcurrent performance and cycle rate performance, thereby ensuring the performance of the battery cell.
[0051] In some embodiments, the first positive electrode sheet 21 , the first positive electrode tab 311 and the second positive electrode tab 331 are integrally formed, and the first negative electrode sheet 22 , the first negative electrode tab 321 and the second negative electrode tab 341 are integrally formed, which simplifies the structure and improves the assembly efficiency of the battery cell.
[0052] like Figure 5 As shown, in some embodiments, the height of the second positive electrode tab 331 is less than the height of the first positive electrode tab 311. It is understood that the height of the second positive electrode tab 331 along the second direction Y is less than the height of the first positive electrode tab 311 along the second direction Y. In the same positive electrode sheet 21, the first positive electrode tab 311 can be called a large tab, and the second positive electrode tab 331 can be called a small tab.
[0053] The height of the second negative electrode tab 341 is less than the height of the first negative electrode tab 321. It is understood that the height of the second negative electrode tab 341 along the second direction Y is less than the height of the first negative electrode tab 321 along the second direction Y. In the same negative electrode sheet 22, the first negative electrode tab 321 can be called a large tab, and the second negative electrode tab 341 can be called a small tab.
[0054] It should be noted that the above-mentioned large tab and small tab are relative to each other in terms of the sizes of the two tabs.
[0055] Figure 4 The diagram shows that the axis of the first positive electrode tab 311 in the first direction X is parallel to or coincides with the axis of the second positive electrode tab 331 in the first direction X, and the axis of the first negative electrode tab 321 in the first direction X is parallel to or coincides with the axis of the second negative electrode tab 341 in the first direction X.
[0056] It should be noted that “axis parallel” may mean that the axis of the first positive electrode tab 311 in the first direction X and the axis of the second positive electrode tab 331 in the first direction X are spaced apart in the second direction Y, and the axis of the first negative electrode tab 321 in the first direction X and the axis of the second negative electrode tab 341 in the first direction X are spaced apart in the second direction Y.
[0057] like Figure 2 As shown, the first positive tab group 31 and the first negative tab group 32 are both connected to the first side end cap 12, and the second positive tab group 33 and the second negative tab group 34 are both connected to the second side end cap 12. It is understood that the first positive tab group 31 and the first negative tab group 32 are both directly connected to the first side end cap 11. Alternatively, the first positive electrode column 41 can be connected to the first side end cap 11 via a first positive electrode connecting piece (not shown), and the first negative tab group 32 is connected to the first side end cap 11 via a first negative electrode connecting piece (not shown). Similarly, the second positive tab group 33 and the second negative tab group 34 are both directly connected to the second side end cap 12. Alternatively, the second positive tab group 33 can be connected to the second side end cap 12 via a second positive electrode connecting piece (not shown), and the second negative tab group 34 can be connected to the second side end cap 12 via a second negative electrode connecting piece (not shown).
[0058] like Figure 2 As shown, in some embodiments, the battery cell further includes a first pole 4 , which is disposed on the first side end cover 11 .
[0059] Specifically, the first electrode 4 includes a first positive electrode 41 and a first negative electrode 42. The first positive electrode 41 is connected to the first positive electrode tab group 31, and the first negative electrode 42 is connected to the first negative electrode tab group 32, thereby achieving a fixed connection between the two electrodes and the first side end cap 11. The second positive electrode tab group 33 and the second negative electrode tab group 34 are both connected to the second side end cap 12 by welding. It is understood that the second positive electrode tab 331 in the second positive electrode tab group 33 is fixedly connected to the second side end cap 12 by welding, and the second negative electrode tab 341 in the second negative electrode tab group 34 is fixedly connected to the second side end cap 12 by welding.
[0060] In this embodiment, the first side end cap 11 is the power connection terminal of the battery cell and is used to connect to the first side end 201 of the electrode assembly 2. The second side end cap 12 is the non-power connection terminal and is used to connect to the second side end 202 of the electrode assembly 2. Therefore, when the electrode assembly 2 is placed in the cavity 10 of the housing 1, the left and right ends of the electrode assembly 2 are respectively connected to the side end caps. In this way, the electrode assembly 2 will not tilt due to its own gravity and will not shake in the cavity 10, thereby preventing the tab from tearing and improving battery performance.
[0061] like Figure 6As shown, in some embodiments, the battery cell further includes a second pole 5 , the first pole 4 is disposed on the first side end cover 11 , and the second pole 5 is disposed on the second side end cover 12 .
[0062] Specifically, the first electrode 4 includes a first positive electrode 41 and a first negative electrode 42. The first positive electrode 41 is directly connected to the first positive electrode tab group 31, and the first negative electrode 42 is directly connected to the first negative electrode tab group 32, thereby achieving a fixed connection between the two electrodes and the first side end cover 11. The second electrode 5 includes a second positive electrode 51 and a second negative electrode 52. The second positive electrode 51 is directly connected to the second positive electrode tab group 33, and the second negative electrode 52 is directly connected to the second negative electrode tab group 34, thereby achieving a fixed connection between the two electrodes and the second side end cover 12.
[0063] In some embodiments, the first positive electrode column 41 can be connected to the first positive electrode tab 311 of the first positive electrode tab group 31 via a first positive electrode connecting tab (not shown), and the second positive electrode column 51 can be connected to the second positive electrode tab 331 of the second positive electrode tab group 33 via a second positive electrode connecting tab (not shown). The first negative electrode column 42 can be connected to the first negative electrode tab 321 of the first negative electrode tab group 32 via a first negative electrode connecting tab (not shown), and the second negative electrode column 52 can be connected to the second negative electrode tab 341 of the second negative electrode tab group 34 via a second negative electrode connecting tab (not shown).
[0064] When the battery cell is in use, the current can flow from the first positive tab group 31 to the electrode assembly 2 and then to the first negative tab group 32, or from the first positive tab group 31 to the electrode assembly 2 and then to the second negative tab group 34, or from the second positive tab group 33 to the electrode assembly 2 and then to the first negative tab group 32.
[0065] In this embodiment, the first side end cap 11 is the power connection end of the battery cell and is used to connect to the first side end 201 of the electrode assembly 2. The second side end cap 12 is the power connection end and is used to connect to the second side end 202 of the electrode assembly 2. This allows both the left and right ends of the battery cell to be connected to the external circuit, providing more power connection points for the external circuit. In addition, when the electrode assembly 2 is disposed in the cavity 10 of the shell 1, the left and right ends of the electrode assembly 2 are respectively connected to the side end caps. In this way, the electrode assembly 2 will not tilt due to its own gravity and will not shake in the cavity 10, thereby preventing the tab from tearing and improving the performance of the battery.
[0066] like Figure 7As shown, in some embodiments, the first positive tab group 31 and the second positive tab group 33 are symmetrically arranged along the height of the battery cell. The first negative tab group 32 and the second negative tab group 34 are symmetrically arranged along the height of the battery cell. When the battery cell is in use, current can flow from the first positive tab group 31 to the electrode assembly 2 and then to the first negative tab group 32; from the first positive tab group 31 to the electrode assembly 2 and then to the second negative tab group 34; or from the second positive tab group 33 to the electrode assembly 2 and then to the first negative tab group 32.
[0067] like Figure 8 As shown, in some embodiments, the first positive tab group 31 and the second positive tab group 33 are symmetrically arranged about the center of the housing 1. The first negative tab group 32 and the second negative tab group 34 are symmetrically arranged about the center of the housing 1. When the battery cell is in use, current can flow from the first positive tab group 31 to the electrode assembly 2 and then to the first negative tab group 32, from the first positive tab group 31 to the electrode assembly 2 and then to the second negative tab group 34, or from the second positive tab group 33 to the electrode assembly 2 and then to the first negative tab group 32.
[0068] An embodiment of the present application also provides a battery pack, comprising at least two of the above-mentioned battery cells, at least two of which are connected in series and parallel. The battery pack may be a battery module, a battery pack, or a battery cluster. All the battery cells of the battery pack may be connected in series or in parallel. Of course, a part of the battery cells of the battery pack may be connected in series, and another part may be connected in parallel. This is not particularly limited here, and the specific configuration may be as needed. The battery pack connects the tab at the first side end of the electrode assembly to the first side end cover, and the tab at the second side end to the second side end cover, so as to fix the two ends of the electrode assembly in the length direction. This can prevent the electrode assembly from tilting due to its own gravity, prevent the tab from tearing, and improve the performance of the battery.
[0069] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.
[0070] The above is a detailed introduction to a battery cell and a battery pack provided in the embodiments of the present application. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the technical solutions and core ideas of the present application. Ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. 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: include: A housing having a cavity and a first opening and a second opening communicating with the cavity; a first side end cover, disposed on the first opening; a second side end cover, disposed on the second opening; as well as An electrode assembly is disposed in the cavity, the electrode assembly having a first side end and a second side end facing away from each other; The first side end is connected to a first positive tab group and a first negative tab group, and the first positive tab group and the first negative tab group are spaced apart in the height direction of the battery cell; the second side end is connected to a second positive tab group and a second negative tab group, and the second positive tab group and the second negative tab group are spaced apart in the height direction of the battery cell; The first positive electrode tab group and the first negative electrode tab group are both connected to the first side end cover, and the second positive electrode tab group and the second negative electrode tab group are both connected to the second side end cover.
2. The battery cell according to claim 1, characterized in that: The electrode assembly includes a plurality of positive electrode sheets, a plurality of negative electrode sheets, and a plurality of separators, wherein the positive electrode sheets and the negative electrode sheets are stacked, and the separators are arranged between adjacent positive electrode sheets and negative electrode sheets; The first side ends of the plurality of positive electrode sheets are connected to the first positive electrode tab group, and the second side ends are connected to the second positive electrode tab group; The first side ends of the plurality of negative electrode sheets are connected to the first negative electrode tab group, and the second side ends are connected to the second negative electrode tab group.
3. The battery cell according to claim 2, characterized in that: The first positive electrode tab group includes a plurality of first positive electrode tabs, which are stacked along the width direction of the battery cell; the second positive electrode tab group includes a plurality of second positive electrode tabs, which are stacked along the width direction of the battery cell, wherein the first side end of each positive electrode sheet is connected to the first positive electrode tab, and the second side end is connected to the second positive electrode tab; The first negative electrode tab group includes a plurality of first negative electrode tabs, which are stacked along the width direction of the battery cell; the second negative electrode tab group includes a plurality of second negative electrode tabs, which are stacked along the width direction of the battery cell, wherein the first side end of each negative electrode sheet is connected to the first negative electrode tab, and the second side end is connected to the second negative electrode tab.
4. The battery cell according to claim 3, characterized in that: The height of the second positive electrode tab is smaller than the height of the first positive electrode tab; The height of the second negative electrode tab is smaller than the height of the first negative electrode tab.
5. The battery cell according to any one of claims 1 to 3, characterized in that: The first positive electrode tab group and the second positive electrode tab group are symmetrically arranged in a height direction of the battery cell; The first negative electrode tab group and the second negative electrode tab group are symmetrically arranged in a height direction of the battery cell.
6. The battery cell according to any one of claims 1 to 3, characterized in that: The first positive electrode tab group and the second positive electrode tab group are symmetrically arranged around the center of the housing; The first negative electrode tab group and the second negative electrode tab group are symmetrically arranged about the center of the shell.
7. The battery cell according to claim 1, characterized in that: Also includes: A first pole, provided on the first side end cover; The first electrode column includes a first positive electrode column and a first negative electrode column, the first positive electrode column is connected to the first positive electrode tab group, and the first negative electrode column is connected to the first negative electrode tab group; The second positive electrode tab group and the second negative electrode tab group are both connected to the second side end cover by welding.
8. The battery cell according to claim 1, characterized in that: Also includes: A first pole, provided on the first side end cover; The second pole is arranged on the second side end cover.
9. The battery cell according to claim 8, characterized in that: The first electrode column includes a first positive electrode column and a first negative electrode column, the first positive electrode column is connected to the first positive electrode tab group, and the first negative electrode column is connected to the first negative electrode tab group; The second electrode column includes a second positive electrode column and a second negative electrode column. The second positive electrode column is connected to the second positive electrode tab group, and the second negative electrode column is connected to the second negative electrode tab group.
10. A battery pack, characterized in that: The invention comprises at least two battery cells according to any one of claims 1 to 9, wherein the at least two battery cells are connected in series and parallel.