Single battery, battery pack and electric equipment
By dividing the tabs into a first and a second bundle facing opposite directions and welding them to the terminal posts, combined with connecting pieces and protective pieces, the problem of short circuits caused by inserting the tabs into the battery is solved, improving battery reliability and manufacturing efficiency.
Patent Information
- Application Number
- CN202422712117.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-07
- Publication Date
- 2026-01-30
- Estimated Expiration
- 2034-11-07
AI Technical Summary
During the manufacturing process of a single battery cell, the inner and outer layers experience different forces when the tabs are bent, which can cause some tabs to become embedded in the winding core, leading to a short circuit.
The electrode tab is divided into two bundles, with the first and second bundles bending in opposite directions and welded to the electrode post. The length of the electrode tab is limited to prevent internal insertion. Connecting and protective plates are used for connection and protection.
It effectively avoids short circuits caused by inserting the tabs, reducing the defect rate of individual batteries, battery packs, and electrical equipment.
Smart Images
Figure CN223858393U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to new energy battery technical field especially, it is a kind of single battery, battery pack and electric equipment. BACKGROUND
[0002] At present, in the manufacturing process of single battery, because tab is connected to pole or connecting piece by butterfly welding, after welding, it is turned over and rolled, so that tab presents the state of bending. The core is usually stacked with multiple tabs, and the stacked tabs are welded together during welding. Therefore, the inner and outer tabs may have different bending radii and stress when bending. When there are more tabs, some tabs may be inserted into the core, causing internal short circuit. SUMMARY
[0003] The utility model aims at providing a single battery, a battery pack and an electric device, which can prevent the problem of short circuit caused by tab insertion.
[0004] To achieve the above-mentioned purpose, the utility model provides a single battery, comprising:
[0005] A shell has a first direction, a second direction and a third direction intersecting with each other. The shell also has a receiving cavity. The shell has an opening at one end along the first direction, which is in communication with the receiving cavity.
[0006] A top cover is arranged at the opening and connected to the shell.
[0007] A pole is arranged on the top cover.
[0008] An electrode assembly is arranged in the receiving cavity. The electrode assembly includes a body and a tab part. The tab part includes multiple tabs stacked in the third direction. A part of the tabs forms a first bundle, and another part of the tabs forms a second bundle. The first bundle is bent and welded to the pole. The second bundle is bent and welded to the pole.
[0009] In the third direction, the bending directions of the first bundle and the second bundle are opposite.
[0010] In some embodiments of the application:
[0011] The first bundle and / or the second bundle include N tabs stacked, and 10≤N≤40.
[0012] In some embodiments of the application:
[0013] The number of tabs in the first bundle and the second bundle is the same.
[0014] In some embodiments of the present application:
[0015] The first beam is bent and welded to the pole to form a first welding mark on the tab of the first beam, and the second beam is bent and welded to the pole to form a second welding mark on the tab of the second beam.
[0016] The electrode assembly is provided as one;
[0017] The body has a first end face facing the top cover in the first direction, and a projection of the body on the first end face in the first direction has a preset area, and projections of the first welding mark and the second welding mark on the first end face in the first direction are both located in the preset area.
[0018] In the third direction, the size of the body is L1 mm, the size between any edge of the preset area and the edge of the body close to it is L2 mm, and L2 / L1=1 / 4.
[0019] In some embodiments of the present application:
[0020] In the third direction, a line between the center of the first welding mark and the midpoint of the body edge corresponding to the first welding mark is a first auxiliary line, a line between the center of the second welding mark and the midpoint of the body edge corresponding to the second welding mark is a second auxiliary line, the angle between the extension direction of the first auxiliary line and the third direction is α°, and the angle between the extension direction of the second auxiliary line and the third direction is β°, satisfying: 30°≤α°≤80°, 30°≤β°≤80°.
[0021] In some embodiments of the present application, the single battery further comprises:
[0022] The connecting piece is arranged between the pole and the tab portion, and the pole and the tab portion are connected through the connecting piece.
[0023] The electrode assembly is provided as two and arranged along the third direction;
[0024] The connecting piece includes a pole connecting portion and three tab connecting portions, the three tab connecting portions are arranged along the third direction and are all connected to the pole connecting portion, and the pole connecting portion is connected to the pole, wherein the tab connecting portions at both ends of the third direction are respectively connected to the first beam and the second beam of two different electrode assemblies, and the tab connecting portion in the middle is connected to the first beam and the second beam of two different electrode assemblies at the same time.
[0025] In some embodiments of the present application:
[0026] In the third direction, two adjacent tab connecting portions are spaced apart.
[0027] In some embodiments of the present application, the single battery further comprises:
[0028] A protective sheet is located on the side of the first and second welding marks facing the body, the protective sheet covers the first and second welding marks, and the first and second sub-beams are welded to the protective sheet.
[0029] The utility model also provides a battery pack, comprising:
[0030] A shell;
[0031] A plurality of single batteries as any of the above are arranged inside the shell and electrically connected to each other.
[0032] The utility model also provides a power consumption equipment comprising the battery pack as described above.
[0033] The utility model provides a single battery, a battery pack and a power consumption equipment, which have the beneficial effects that, compared with the prior art:
[0034] The single battery comprises a shell, a top cover, a pole and an electrode assembly, the electrode assembly comprises a body and a tab portion, a part of the tabs forms a first sub-beam, and a part of the tabs forms a second sub-beam, the first sub-beam and the second sub-beam are welded to the pole, and the bending directions of the first sub-beam and the second sub-beam are opposite. Through the structure, the tabs are partially bundled, the lengths of the first sub-beam and the second sub-beam are not too long, and the problem of short circuit caused by the insertion of the tab portion due to the excessive length of the tab portion is avoided.
[0035] The battery pack comprises the single battery, can avoid the problem of short circuit caused by the insertion of the tab portion due to the excessive length of the tab portion, and reduces the rate of defective products of the battery pack.
[0036] The power consumption equipment comprises the battery pack, can avoid the problem of short circuit caused by the insertion of the tab portion due to the excessive length of the tab portion, and reduces the rate of defective products of the power consumption equipment. BRIEF DESCRIPTION OF DRAWINGS
[0037] Figure 1 is a top view of the single battery of the embodiment of the utility model.
[0038] Figure 2 is Figure 1 is a sectional view of A in the figure.
[0039] Figure 3 is Figure 2 is an enlarged schematic view of B in the figure.
[0040] Figure 4 is Figure 2 is an enlarged schematic view of B in the middle.
[0041] Figure 5 is a front view of a single battery according to an embodiment of the present application.
[0042] Figure 6 is Figure 5 is a sectional view of C in the middle.
[0043] Figure 7 is Figure 6 is a sectional view of D in the middle.
[0044] Figure 8 is Figure 7 is an enlarged schematic view of E in the middle.
[0045] In the figure, 1, housing; 2, top cover; 31, pole; 4, electrode assembly; 5, connecting piece; 6, protective sheet; 11, accommodating cavity; 41, body; 42, tab portion; 411, preset area; 421, first sub-beam; 422, second sub-beam; 51, pole connecting portion; 52, tab connecting portion; 53, notch.
[0046] Z, first direction; X, second direction; Y, third direction. DETAILED DESCRIPTION
[0047] The specific embodiments of the present application will be further described in detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate the present application, but not to limit the scope of the present application.
[0048] In the description of the present application, it should be noted that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance.
[0049] In the description of the utility model, it is necessary to explain that, unless there is definite stipulation and limitation, the term "installation", "connection" should be broad sense understanding, for example, can be fixed connection, also can be detachable connection, or integrally connected, can be mechanical connection, also can be electrical connection, can be direct connection, also can indirectly connect through intermediate medium, can be two element inside communication. For ordinary skilled person in the art, the specific meaning of the above-mentioned term in the utility model can be understood according to specific circumstances.
[0050] In addition, in the description of the utility model, the meaning of "multiple" is two or more than two, unless otherwise specified.
[0051] For ordinary skilled person in the art, the specific meaning of the above-mentioned term in the utility model can be understood according to specific circumstances.
[0052] Please refer to Figure 1 And Figure 2 The utility model embodiment preferred embodiment of a single battery, including: shell 1, top cover 2, pole 3 and electrode assembly 4.
[0053] Shell 1 has the first direction Z, the second direction X and the third direction Y that cross each other, shell 1 also has accommodating cavity 11, and shell 1 is provided with the opening that is connected with accommodating cavity 11 along the one end of the first direction Z.
[0054] In the embodiment, the height direction of shell 1 is the first direction Z, the length direction of shell 1 is the second direction X, and the width direction of shell 1 is the third direction Y. The first direction Z, the second direction X and the third direction Y are perpendicular to each other. Perpendicular refers to the state that the angle is 85 ° ~ 95 °.
[0055] In the embodiment, shell 1 is rectangular body shape. In other embodiments, shell 1 can also be provided as square body, and in specific implementation, can be set according to needs.
[0056] The opening on shell 1 is connected with accommodating cavity 11, for placing electrode assembly 4 in accommodating cavity 11.
[0057] Top cover 2 is covered in the opening and is connected with shell 1.
[0058] In the embodiment, shell 1 is rectangular body, and top cover 2 is rectangular, and in other embodiments, the shape of top cover 2 can be set according to actual needs, such as can be set as circular.
[0059] Top cover 2 is used to cover the opening, so that accommodating cavity 11 is in sealed state.
[0060] Pole 3 is arranged on top cover 2.
[0061] The pole 3 is used to electrically connect the battery monomer to external devices. The pole 3 is divided into positive poles 3 and negative poles 3 with different polarities. The positive pole 3 or the negative pole 3 of each battery monomer can be provided in multiple. In this embodiment, one positive pole 3 and one negative pole 3 are provided. In the specific production implementation, the number and position of the pole 3 can be set as needed.
[0062] The electrode assembly 4 is arranged in the accommodating cavity 11. The electrode assembly 4 includes a body 41 and a tab portion 42. The tab portion 42 includes a plurality of tabs arranged in layers. A part of the tabs are formed into a first sub-beam 421, and another part of the tabs are formed into a second sub-beam 422. The first sub-beam 421 is bent and welded to the pole 3. The second sub-beam 422 is bent and welded to the pole 3.
[0063] The body 41 is formed by winding or laminating a positive pole sheet, a diaphragm, and a negative pole sheet.
[0064] The bending directions of the first sub-beam 421 and the second sub-beam 422 are opposite in the third direction Y.
[0065] The tabs of the tab portion 42 can be positive tabs or negative tabs.
[0066] The tab portion 42 is arranged on the body 41. The tab portion 42 itself is also formed by the tabs on the body 41 arranged in layers.
[0067] In the prior art, the tab portion 42 on the same body 41 is not sub-beamed. The tab portion 42 formed by the tabs arranged in layers has a relatively long extension direction. After welding and turning over the electrode assembly 4, the end of the tab portion 42 far from the body 41 is prone to internal insertion and short circuit.
[0068] In this embodiment, the tab portion 42 is sub-beamed into the first sub-beam 421 and the second sub-beam 422. The bending directions of the first sub-beam 421 and the second sub-beam 422 are opposite. The first sub-beam 4210 and the second sub-beam 422 are both welded to the pole 3. In this way, the number of layers of the tabs of the first sub-beam 421 and the second sub-beam 422 can be reduced. The lengths of the first sub-beam 421 and the second sub-beam 422 will not be too long. Thus, the problem of short circuit caused by the internal insertion of the tabs due to the excessive length of the tab portion 42 can be avoided.
[0069] In some embodiments, the first sub-beam 421 and / or the second sub-beam 422 include N tabs arranged in layers, satisfying 10≤N≤40.
[0070] And / or, the first sub-beam 421 and the second sub-beam 422 can both include N tabs arranged in layers, or one of the first sub-beam 421 or the second sub-beam 422 includes N tabs arranged in layers.
[0071] When the value of N is greater than 40, the thickness of the first split beam 421 or the second split beam 422 is too thick, and it is difficult to weld through the entire thickness during pre-welding, resulting in the problem of insufficient welding. If the value of N is less than 10, the number of tab layers of the first split beam 421 or the second split beam 422 is too small, and the number of split beams of the tab is too large, resulting in a complicated subsequent welding process and a low manufacturing efficiency of the electrode assembly 4.
[0072] Preferably, the number of tabs of the first split beam 421 and the second split beam 422 is the same. By equally distributing the tab layers of the first split beam 421 and the second split beam 422, the same welding parameters can be used for the first split beam 421 and the second split beam 422, reducing the difficulty of implementation.
[0073] In some embodiments, the first split beam 421 is bent and welded to the pole 3 to form a first welding mark on the tab of the first split beam 421, and the second split beam 422 is bent and welded to the pole 3 to form a second welding mark on the tab of the second split beam 422.
[0074] The first welding mark is also the welding position of the first split beam 421 and the pole 3, and the second welding mark is also the welding position of the second split beam 422 and the pole 3.
[0075] Please refer to Figure 3 and Figure 4 Under the premise that the number of electrode assemblies 4 is 1, the body 41 has a first end face facing the top cover 2 in the first direction Z, and the projection of the body 41 on the first end face in the first direction Z has a preset area 411. The projections of the first welding mark and the second welding mark on the first end face in the first direction Z are both located within the preset area 411. In the third direction Y, the size of the body 41 is L1 mm, the size between any edge of the preset area 411 and the edge of the body 41 close to it is L2 mm, and L2 / L1 = 1 / 4.
[0076] By limiting the projection position of the welding position on the first end face, the position of the tab from the outermost folding point of the split beam can be prevented from being too far, and the bending curvatures of the tabs in each split beam can be close to each other, thereby better avoiding the problem of tab insertion leading to short circuit.
[0077] When measuring L1 and L2, a common length measuring tool can be used, such as a ruler or a tape measure.
[0078] Specifically, when measuring L1, one edge of the body 41 in the third direction Y is taken as a reference edge, the distance between the reference edge and the other edge of the body 41 in the third direction Y is measured by a length measuring tool, and the average value is obtained by measuring multiple times, thereby obtaining the size L1 mm of the body 41.
[0079] In measuring L2, taking one edge of the body 41 in the third direction Y as a reference edge, the distance between the reference edge and the limit position where the welding mark close to the reference edge is measured by a length measuring tool along the third direction Y, and the size between any edge of the preset area 411 and the edge of the body 41 close to it is obtained by measuring multiple times and taking the average value, L2 mm.
[0080] In some embodiments, in the third direction Y, the line between the center of the first welding mark and the midpoint of the edge of the body 41 corresponding to the first welding mark is the first auxiliary line, the line between the center of the second welding mark and the midpoint of the edge of the body 41 corresponding to the second welding mark is the second auxiliary line, the angle between the extension direction of the first auxiliary line and the third direction Y is α°, and the angle between the extension direction of the second auxiliary line and the third direction Y is β°, satisfying: 30°≤α°≤80°, 30°≤β°≤80°.
[0081] In this range, the curvature of each split tab is small, and the split tab is less likely to have an interpolation short circuit problem, and the distance requirement of each split in the first direction Z can be reduced, thereby improving the energy density of the single battery.
[0082] In measuring α and β, a general angle measuring tool can be used, such as a protractor.
[0083] Specifically, in measuring α, taking any one end of the body 41 in the third direction Y as the starting point of the protractor, the angle of the first welding mark relative to the starting point is measured, multiple measurements are taken and the average value is obtained, and the angle α° between the extension direction of the first auxiliary line and the third direction Y is obtained.
[0084] In measuring β, taking any one end of the body 41 in the third direction Y as the starting point of the protractor, the angle of the second welding mark relative to the starting point is measured, multiple measurements are taken and the average value is obtained, and the angle β° between the extension direction of the second auxiliary line and the third direction Y is obtained.
[0085] In some embodiments, the single battery further comprises a connecting piece 5, the connecting piece 5 is arranged between the pole 3 and the tab part 42, and the pole 3 and the tab part 42 are connected through the connecting piece 5.
[0086] The arrangement of the connecting piece 5 can facilitate the connection of the first split tab 421 and the second split tab 422 to the pole 3, so that the external device can be electrically connected to the electrode assembly 4 inside the shell 1 through the pole 3.
[0087] Please refer to Figure 5 and Figure 6 , the electrode assembly 4 is arranged in two cases, and the two electrode assemblies 4 are arranged along the third direction Y.
[0088] Please refer to Figure 7 and Figure 8The connecting sheet 5 includes a pole connecting portion 51 and three tab connecting portions 52, the three tab connecting portions 52 are arranged along the third direction Y and are all connected to the pole connecting portion 51, and the pole connecting portion 51 is connected to the pole 3. The tab connecting portions 52 at both ends of the third direction Y are respectively connected to the first sub-beam 421 and the second sub-beam 422 of two different electrode assemblies 4, and the tab connecting portion 52 in the middle is connected to the first sub-beam 421 and the second sub-beam 422 of two different electrode assemblies 4.
[0089] Since two electrode assemblies 4 are provided, each electrode assembly 4 is divided into a first sub-beam 421 and a second sub-beam 422, and the welding connection position on the connecting sheet 5 is more, the connecting sheet 5 is divided into a pole connecting portion 51 and a tab connecting portion 52, so as to avoid the conflict on the connecting sheet 5 due to the more welding positions.
[0090] Since the tab connecting portion 52 in the middle connects more sub-beams than the tab connecting portions 52 at both ends, the welding position is also more, and therefore the size of the tab connecting portion 52 in the middle in the third direction Y can be set to be larger, and in specific implementation, it can be set according to actual needs.
[0091] In the third direction Y, two adjacent tab connecting portions 52 are arranged at intervals. In other words, a gap 53 is formed between the two adjacent tab connecting portions 52. Although there is a certain number of welding positions on the connecting sheet 5, the area of the connecting sheet 5 does not need to be blindly expanded, and the setting of the gap 53 does not affect the welding of each sub-beam, but also saves the material of the connecting sheet 5, and reduces the mass of the single battery.
[0092] In some embodiments, the single battery further includes a protective sheet 6, the protective sheet 6 is located on the side of the first welding mark and the second welding mark facing the body 41, the protective sheet 6 covers the first welding mark and the second welding mark, and the first sub-beam 421 and the second sub-beam 422 are both welded and connected to the protective sheet 6.
[0093] The setting of the protective sheet 6 can protect the welding position of each sub-beam and prevent the tab from being welded through.
[0094] The embodiment also provides a battery pack including a shell and the single battery described above, and the single battery is arranged inside the shell and electrically connected to each other.
[0095] The single battery is arranged in multiple rows, and the single battery and the adjacent single battery are electrically connected, and all the single batteries are electrically connected in series or in parallel.
[0096] Since the single battery described above is provided, the problem of short circuit caused by the insertion of the tab portion 42 due to the excessive length of the tab portion 42 can be avoided, and the defective rate of the battery pack is reduced.
[0097] The embodiment also provides a power utilization device including the battery pack. The problem of short circuit caused by the insertion of the tab into the battery pack due to the overlength of the tab can be avoided, and the defective rate of the power utilization device is reduced.
[0098] The above merely describes the preferred embodiments of the present application, and it should be noted that those skilled in the art can make several improvements and replacements without departing from the technical principles of the present application, and these improvements and replacements should also be considered as the protection scope of the present application.
Claims
1. A single cell, characterized by, The single battery comprises: a shell (1) having a first direction (Z), a second direction (X) and a third direction (Y) intersecting with each other, the shell (1) further having a containing cavity (11), and the shell (1) is provided with an opening communicating with the containing cavity (11) at one end in the first direction (Z); a top cover (2) covering the opening and connected with the shell (1); a pole (31) arranged on the top cover (2); an electrode assembly (4) arranged in the containing cavity (11), the electrode assembly (4) comprising a body (41) and a tab portion (42), the tab portion (42) comprising a plurality of tabs arranged in layers, and in the third direction (Y), a part of the tabs are formed into a first sub-beam (421) and another part of the tabs are formed into a second sub-beam (422), the first sub-beam (421) is welded to the pole (31) after being bent, and the second sub-beam (422) is welded to the pole (31) after being bent; wherein, in the third direction (Y), the bending directions of the first sub-beam (421) and the second sub-beam (422) are opposite.
2. The single battery according to claim 1, wherein: the first sub-beam (421) and / or the second sub-beam (422) comprises N tabs arranged in layers, and 10≤N≤40 is satisfied.
3. The cell according to claim 1, wherein: the number of tabs of the first sub-beam (421) and the second sub-beam (422) is the same.
4. The cell according to claim 1, wherein: the first sub-beam (421) is welded to the pole (31) after being bent and forms a first welding mark on the tabs of the first sub-beam (421), and the second sub-beam (422) is welded to the pole (31) after being bent and forms a second welding mark on the tabs of the second sub-beam; the electrode assembly (4) is provided as one; the body (41) has a first end face facing the top cover (2) in the first direction (Z), and a projection of the body (41) on the first end face in the first direction (Z) has a preset area (411), and projections of the first welding mark and the second welding mark on the first end face in the first direction (Z) are located in the preset area (411); in the third direction (Y), the size of the body (41) is L1 mm, the size between any edge of the preset area (411) and the edge of the body (41) close to the edge is L2 mm, and L2 / L1=1 / 4.
5. The single battery according to claim 1, wherein: in the third direction (Y), a line connecting the center of the first welding mark and the midpoint of the edge of the body (41) corresponding to the first welding mark is a first auxiliary line, a line connecting the center of the second welding mark and the midpoint of the edge of the body (41) corresponding to the second welding mark is a second auxiliary line, the angle between the extension direction of the first auxiliary line and the third direction (Y) is α°, and the angle between the extension direction of the second auxiliary line and the third direction (Y) is β°, and 30°≤α°≤80° and 30°≤β°≤80° are satisfied.
6. The cell according to claim 1, wherein Further comprising: a connecting piece (5) disposed between the pole post (31) and the tab portion (42), the pole post (31) and the tab portion (42) being connected through the connecting piece (5); the electrode assembly (4) is provided in two and arranged along the third direction (Y); the connecting piece (5) comprises a pole post connecting portion (51) and three tab connecting portions (52), the three tab connecting portions (52) are arranged along the third direction (Y) and are all connected to the pole post connecting portion (51), the pole post connecting portion (51) is connected to the pole post (31), wherein the tab connecting portions (52) at both ends of the third direction (Y) are respectively connected to the first beam (421) and the second beam (422) of two different electrode assemblies (4), and the tab connecting portion (52) in the middle is connected to the first beam (421) and the second beam (422) of two different electrode assemblies (4).
7. The single battery according to claim 6, characterized in that: in the third direction (Y), two adjacent tab connecting portions (52) are arranged at intervals.
8. The cell according to claim 4, wherein Further comprising: a protective piece (6) located on the side of the first and second welding marks facing the body (41), the protective piece (6) covering the first and second welding marks, and the first beam (421) and the second beam (422) are both welded to the protective piece (6).
9. A battery pack, characterized by, Comprising: a housing; a plurality of single batteries according to any one of claims 1-8, arranged inside the housing and electrically connected to each other.
10. An electric device, characterized by Comprising the battery pack according to claim 9.