Battery and battery arrangement

Abstract

A battery having a first direction, a second direction, and a third direction perpendicular to each other, characterized in that it comprises a housing, a cover plate, and a cell, wherein a receiving cavity is provided in the housing, the cover plate is arranged on the housing and seals the receiving cavity, the cell is provided in the receiving cavity, the cell comprises a cell body and a tab, an electrode is provided in the cell body, the tab extends outwardly from one side of the electrode, and a direction in which the tab extends is the first direction, and a direction along the plane of the tab and perpendicular to the first direction is the second direction, a dimension of the tab in the second direction is "L1" mm, and a dimension of the cell body in the second direction is "L2" mm, where L1 <L2;wherein the tab has a reinforcing portion, and in the first direction, a minimum distance between an end of the reinforcing portion near the electrode and the electrode is "h1" mm, and a dimension of the tab in the first direction is "H" mm, where 0.002≤(L1 / L2)*(h1 / H)≤0.07.;

Description

TECHNICAL FIELD

[0001] The present utility model relates to the technical field of batteries or accumulators and in particular to a battery and a battery arrangement. BACKGROUND

[0002] As a critical component of lithium-ion batteries, the terminal or tab is a metal conductor extending outward from the cell electrode. To improve the support performance of the tab and prevent it from bending easily during the stacking process, reinforcing ribs are generally provided on the tab.

[0003] Currently, the common method for providing reinforcement ribs on the tab is to press the reinforcement ribs onto the tab with a roller with convex edges. However, when the roller presses the reinforcement ribs onto the tab, if the reinforcement rib is too close to the electrode, the stress is easily concentrated at the corner where the tab and the electrode are connected, resulting in easy cracking of the corner where the tab and the electrode are connected because the width of the tab is smaller than the width of the cell's electrode. In addition, the stress of the rolling during the cell's hot-pressing process also causes the corner where the tab and the electrode are connected to be easy to crack. SUMMARY OF THE UTILITY MODEL

[0004] The main object of the present utility model is to provide a battery that prevents the corner where the tab and the electrode are connected from being torn.

[0005] A further object of the utility model is to provide a battery assembly containing the above-mentioned battery.

[0006] In order to solve the above technical problems, the present utility model provides the following technical schemes: A battery having a first direction, a second direction, and a third direction perpendicular to each other, including a casing, a cover plate, and a cell, wherein a receiving cavity is provided in the casing, the cover plate is arranged on the casing and seals the receiving cavity, the cell is provided in the receiving cavity, the cell comprises a cell body and a tab, an electrode is provided in the cell body, the tab extends outwardly from one side of the electrode, and a direction in which the tab extends is the first direction, and a direction along the plane of the tab and perpendicular to the first direction is the second direction, a dimension of the tab in the second direction is "L1" mm, and a dimension of the cell body in the second direction is "L2" mm, where L1 <L2;the tab has a reinforcing portion, and in the first direction, a minimum distance between an end of the reinforcing portion near the electrode and the electrode is “h1” mm, and a dimension of the tab in the first direction is “H” mm, where 0.002≤(L1 / L2)*(h1 / H)≤0.07.;

[0007] The present utility model also relates to a battery assembly comprising the above-mentioned battery.

[0008] The battery of the present utility model has the following advantageous effects compared to the prior art: In the present utility model, the first direction is the direction in which the tab extends outward from the electrode, the second direction is the width direction of the tab, and the third direction is the thickness direction of the tab. During the winding or stacking process of the electrode, a reinforcing portion must be provided on the tab to prevent the tab from collapsing and folding. If the reinforcing portion is located near the electrode, this will cause greater stress at the junction between the tab and the electrode during the forming process of the reinforcing portion, resulting in cracking. Therefore, it is necessary to control the minimum distance between the reinforcing portion and the electrode.Furthermore, when the dimension "L1" of the tab in the second direction accounts for a large portion of the dimension "L2" of the cell body in the second direction, the connection between the tab and the electrode is wider and its strength is also greater, which can reduce the risk of cracking at the connection between the tab and the electrode. Therefore, when 0.002≤(L1 / L2)*(h1 / H)≤0.07 is satisfied, the dimension of the connection between the tab and the electrode in the second direction and the distance between the reinforcing portion and the electrode can be taken as comprehensive considerations, so that the dimensions of the tab and the electrode in the second direction and the distance between the reinforcing portion and the electrode are maintained within a reasonable range, thereby ensuring normal use of the battery and ensuring battery performance. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a front view of an embodiment of the present utility model; Fig. 2 is a side view of an embodiment of the present utility model; Fig. 3 is a schematic diagram of a reinforcing portion of another embodiment of the present invention; Fig. 4 is a schematic diagram of a reinforcing portion of another embodiment of the present utility model; Fig. 5 is a schematic diagram of a battery assembly of the present utility model.

[0009] In the figures: 100 Housing; 200 Cover plate; 300 Terminal post; 400 Cell; 500 Cell body; 600 Weld point; 1 Electrode; 2 Tab; 3 Reinforcing section; 4 Arc-shaped section. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0010] The specific implementation of the present utility model is described in more detail below in conjunction with the attached drawings and examples. The following examples serve to illustrate the present utility model, but are not intended to limit the scope of protection of the present utility model.

[0011] It should be noted that in the description of the present utility model, the term "include / comprise" used in the specification of the present utility model refers to the presence of the features, integers, steps, operations, parts / components, and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, parts / components, components, and / or groups thereof. It should be noted that when it is said that a part / component is "connected" to another part / component, it / they may be directly connected to other parts / components, or intermediate parts / components may be present. The term "and / or" as used herein includes all or any unit and all combinations of one or more related recited elements.

[0012] As it is in the Fig. As can be seen from Figures 1 to 2, the present utility model relates to a battery having a first direction, a second direction, and a third direction that are perpendicular to each other. The battery includes a casing 100, a cover plate 200, and a cell 400. A receiving cavity is provided in the casing 100. The cover plate 200 is arranged on the casing 100 and seals the receiving cavity. The cell 400 is provided in the receiving cavity. The cell 400 includes a cell body 500 and a tab 2. An electrode 1 is provided in the cell body 500. The tab 2 extends outward from one side of the electrode 1. The direction in which the tab 2 extends is the first direction. The direction along the plane of the tab 2 and perpendicular to the first direction is the second direction.The dimension of the tab 2 in the second direction is “L1” mm, and the dimension of the cell body 500 in the second direction is “L2” mm, where L1 <L2; die Lasche 2 weist einen Verstärkungsabschnitt 3 auf, und in der ersten Richtung beträgt der Mindestabstand zwischen einem Ende des Verstärkungsabschnitts 3 in der Nähe der Elektrode 1 und der Elektrode 1 „h1“ mm, und die Abmessung der Lasche 2 in der ersten Richtung beträgt „H“ mm, wobei 0,002≤(L1 / L2)*(h1 / H)≤0,07 Insbesondere kann der Wert von (L1 / L2)*(h1 / H) 0,006, 0,012, 0,02, 0,025, 0,035, 0,04, 0,05 oder 0,06 betragen.

[0013] In the present utility model, the first direction is the direction in which the tab 2 extends outward from the electrode 1, the second direction is the width direction of the tab 2, and the third direction is the thickness direction of the tab 2. During the winding or stacking process of the electrode 1, it is necessary to provide a reinforcing portion 3 on the tab 2 to prevent the tab 2 from collapsing and wrinkling. If the reinforcing portion 3 is located near the electrode 1, this will cause greater stress at the junction between the tab 2 and the electrode 1 during the molding process of the reinforcing portion 3, resulting in cracking. Therefore, it is necessary to control the minimum distance between the reinforcing portion 3 and the electrode 1.In addition, when the dimension "L1" of the tab 2 in the second direction accounts for a large part of the dimension "L2" of the cell body 500 in the second direction, the connection between the tab 2 and the electrode 1 is also wider and its strength is also greater, which can reduce the risk of cracking at the connection between the tab 2 and the electrode 1. Therefore, when 0.002≤(L1 / L2)*(h1 / H)≤0.07 is satisfied, the dimension of the connection between the tab 2 and the electrode 1 in the second direction and the distance between the reinforcing portion 3 and the electrode 1 can be taken as comprehensive considerations, so that the dimensions of the tab 2 and the electrode 1 in the second direction and the distance between the reinforcing portion 3 and the electrode 1 are maintained within a reasonable range, thereby ensuring normal use of the battery and ensuring battery performance.

[0014] It should be noted that the cell 400 may be a wound cell or a stacked cell. The wound cell is a flat wound body formed by winding the negative electrode, wherein the first separator, the positive electrode, and the second separator are stacked one after another, and a plurality of tabs are provided at intervals on one side of the negative electrode and the positive electrode in the longitudinal direction. The stacked cell consists of a composite body folded in a "Z" shape, and the composite body includes a first separator, a second separator, a positive electrode, and a negative electrode. The positive electrode and the negative electrode are both provided between the first separator and the second separator, and a plurality of positive electrodes and a plurality of negative electrodes are alternately provided one after another along the length direction of the first separator.

[0015] In some embodiments, 20 mm≤L1≤150 mm, 50 mm≤L2≤1000 mm. Specifically, the value of L1 may be 40 mm, 60 mm, 80 mm, 100 mm, 120 mm, or 140 mm, and the value of L2 may be 100 mm, 200 mm, 300 mm, 500 mm, 700 mm, or 900 mm, so that L1 and L2 may be within the above-mentioned range to ensure the stability of the connection between the electrode 1 and the tab 2.

[0016] In some embodiments, 0.02≤L1 / L2≤0.4. Specifically, the value of "L1 / L2" may be 0.06, 0.08, 0.16, 0.24, 0.3, or 0.35, so that "L1 / L2" may be within the above-mentioned range to ensure the stability of the connection between the electrode 1 and the tab 2.

[0017] In some embodiments, 3 mm≤h1≤15 mm, 10 mm≤H≤50 mm. Specifically, the value of h1 may be 5 mm, 7 mm, 9 mm, 11 mm, or 13 mm, and the value of "H" may be 15 mm, 25 mm, 35 mm, or 45 mm, so that "h1 / H" may be within the above-mentioned range to ensure the stability of the connection between the electrode 1 and the tab 2.

[0018] In some embodiments, 0.06≤h1 / H≤0.3. Specifically, the value of "h1 / H" may be 0.09, 0.15, 0.2, or 0.25, so that "h1 / H" may be within the above-mentioned range to ensure the stability of the connection between the electrode 1 and the tab 2.

[0019] In some embodiments, 0.01≤(L1 / L2)*(h1 / H)≤0.06 so that (L1 / L2)*(h1H) can be within the above range to ensure the stability of the connection between the electrode 1 and the tab 2.

[0020] In the present embodiment, in the first direction, the distance between an end of the reinforcing portion 3 remote from the electrode 1 and an end of the tab 2 remote from the electrode 1 is "h2" mm, where 3 mm≤h2≤15 mm, 0.06≤h2 / H≤0.4, 0.1≤L1 / L2≤0.4. Specifically, the value of h2 may be 5 mm, 7 mm, 9 mm, 11 mm, or 13 mm, and the value of "h2 / H" may be 0.1, 0.16, 0.2, 0.3, or 0.35.

[0021] If "h2 / H" is too large, the distance between an end of the reinforcing portion 3 in the first direction remote from the electrode 1 and an end of the tab 2 in the first direction remote from the electrode 1 is also large, so that the region is not supported by the reinforcing portion 3 and is prone to folding. If "h2 / H" is too small, the distance between an end of the reinforcing portion 3 in the first direction remote from the electrode 1 and an end of the tab 2 in the first direction remote from the electrode 1 is also small, which makes welding to the terminal 300 difficult. Therefore, setting "h2 / H" within the range of 0.06-0.4 can ensure the support capacity of the tab 2, making the tab 2 not easy to fold and also allowing the tab 2 to be easily welded to the terminal 300.In addition, since a gap is provided between the end of the reinforcement portion 3 remote from the electrode 1 and the end of the tab 2 remote from the electrode 1 to have sufficient reinforcement capacity, the dimension of the reinforcement portion 3 in the first direction cannot be too short. This brings the reinforcement portion 3 closer to the electrode 1, so that the reinforcement portion 3 can easily cause the tab 2 and the electrode 1 to crack during the manufacturing process. To ensure the stability of the tab 2 and the electrode 1, the lower limit of "L1 / L2" should be larger, and 0.1≤L1 / L2≤0.4 is maintained to ensure the stability of the tab 2 and the electrode 1.

[0022] In the present embodiment, at least one side of the tab 2 in the second direction merges into an arc shape with the electrode 1 and forms an arc-shaped portion 4. This can prevent stress concentration at the corner between the tab 2 and the electrode 1, so that the tab 2 and the electrode 1 cannot easily tear.

[0023] Preferably, the radius of the arcuate portion is 4 “e” mm, where 1 mm≤e≤10 mm, 0.002≤(L1 / L2)*(h1 / H)≤0.06 In particular, the value of “e” may be 2 mm, 4 mm, 6 mm or 8 mm.

[0024] Since the arcuate portion 4 itself has the function of stress relief and can reduce stress concentration, the greater the curvature of the arcuate portion 4, the more stress can be relieved. Therefore, when 1 mm≤e≤10 mm, the upper limit of (L1 / L2)*(h1 / H) can be reduced, and 0.002≤(L1 / L2)*(h1 / H)≤0.06 is maintained to ensure the stability of the connection between the tab 2 and the electrode 1.

[0025] In the present embodiment, the tab 2 has a plurality of reinforcement portions 3 at intervals evenly spaced along the second direction. Each reinforcement portion 3 is configured to extend along the first direction, and the distance between two adjacent reinforcement portions 3 in the second direction is "L3" mm, where 0.01≤L3 / L1≤0.07, 0.005≤(L1 / L2)*(h1 / H)≤0.05, 20 mm≤L1≤150 mm, 1 mm≤L3≤4 mm. Specifically, the value of "L3" may be 1.5 mm, 2 mm, 2.5 mm, or 3 mm.

[0026] On the tab 2, the larger the number of reinforcement sections 3, the denser the arrangement. In this case, if the reinforcement sections 3 on the tab 2 are pushed out, it is easier to cause tearing between the tab 2 and the electrode 1. Therefore, it is necessary to increase the distance "h1" between the reinforcement sections 3 and the electrode 1 to avoid tearing between the tab 2 and the electrode 1. The smaller the number of reinforcement sections 3, the thinner the arrangement. In this case, if the reinforcement sections 3 on the tab 2 are pushed out, it is not easy to cause tearing between the tab 2 and the electrode 1. Therefore, the distance "h1" between the reinforcement sections 3 and the electrode 1 can be smaller.Therefore the setting 0.01≤L3 / L1≤0.07, 0.005≤(L1 / L2)*(h1 / H)≤0.05, 20 mm≤L1≤150 mm, 1 mm≤ <L3≤4 mm, um eine bessere Unterstützung für die Lasche 2 zu gewährleisten und ein Reißen der Verbindung zwischen der Lasche 2 und der Elektrode 1 zu verhindern.

[0027] In other embodiments, the reinforcing portion 3 extends in the first direction from one end of the tab 2 to the other end, and the extension direction of the reinforcing portion 3 is inclined with respect to the first direction.

[0028] That is, the plurality of reinforcing sections 3 can also be arranged obliquely on the tab 2 in order to also serve to support the tab 2.

[0029] In the present embodiment, the direction perpendicular to the plane of the tab 2 is the third direction. In the third direction, the reinforcing portion 3 protrudes on one side of the tab 2, and the reinforcing portion 3 is recessed on the other side of the tab 2 to facilitate pressing the reinforcing portion 3 onto the tab 2 with a roller. A gap is provided between the reinforcing portion 3 and the second-direction side of the tab 2 so that the second-direction side of the tab 2 does not tear during the manufacturing of the reinforcing portion 3.

[0030] Especially in combination with the Fig. 3 and Fig. 4, the reinforcement section 3 may extend continuously or discontinuously in the first direction. If the reinforcement section 3 is discontinuous, the tab 2 has a plurality of partial reinforcement sections spaced apart along the first direction, and the plurality of partial reinforcement sections form the reinforcement section 3.

[0031] As it is in Fig.As can be seen from Fig. 5, the present utility model also relates to a battery assembly including the battery as described above. The battery comprises a casing 100, a cover plate 200, and a cell 400. The casing 100 has a receiving cavity therein, the cover plate 200 is disposed on the casing 100 and seals the receiving cavity. The cover plate 200 has a terminal 300, and the cell 400 is disposed in the receiving cavity. The tab 2 of the cell 400 is welded to the terminal 300, forming a weld mark 600. On the connection path between the tab 2 and the cell body 500, the distance between the weld mark 600 and the cell body 500 is "L4" mm, 10 mm≤L4≤50 mm, where (L4 / H)>(h1 / H). In particular, the value of “L4” can be 15 mm, 20 mm, 30 mm or 40 mm.

[0032] When the tab 2 and the terminal 300 are welded, the generated heat is transferred to the battery body 500. Therefore, to prevent the heat from affecting the active material layer and the separator of the cell body 500 and causing deterioration in battery performance, it is necessary to arrange the welding mark 600 between the tab 2 and the terminal 300 away from the cell body 500. In addition, when welding is performed at the location where the reinforcing portion 3 is provided on the tab 2, the contact area of ​​the two adjacent tabs 2 is larger, which is conducive to improving welding efficiency and quality. Therefore, (L4 / H)>(h1 / H) is set to maintain a certain distance between the welding mark 600 and the battery body 500, which is conducive to the welding process between two adjacent tabs 2.

[0033] The above is only a preferred embodiment of the present utility model. It should be noted that those skilled in the art can make various improvements and substitutions without departing from the technical principle of the present utility model, and these improvements and substitutions should also be considered within the scope of the present utility model.

Claims

[1] Battery having a first direction, a second direction and a third direction which are perpendicular to each other, characterized bythat it comprises a housing, a cover plate and a cell, wherein a receiving cavity is provided in the housing, the cover plate is arranged on the housing and seals the receiving cavity, the cell is provided in the receiving cavity, the cell comprises a cell body and a tab, an electrode is provided in the cell body, the tab extends outwardly from one side of the electrode, and a direction in which the tab extends is the first direction, and a direction along the plane of the tab and perpendicular to the first direction is the second direction, a dimension of the tab in the second direction is "L1" mm, and a dimension of the cell body in the second direction is "L2" mm, where L1 <L2;wherein the tab has a reinforcing portion, and in the first direction, a minimum distance between an end of the reinforcing portion near the electrode and the electrode is "h1" mm, and a dimension of the tab in the first direction is "H" mm, where 0.002≤(L1 / L2)*(h1 / H)≤0.07.; [2] Battery according to claim 1, characterized by that 20mm≤L1≤150mm, 50mm≤L2≤1000mm. [3] Battery according to claim 1 or 2, characterized by that 0.02≤L1 / L2≤0.

4. [4] Battery according to one of the preceding claims, characterized by that 3mm≤h1≤15mm, 10mm≤H≤50mm. [5] Battery according to one of the preceding claims, characterized by that 0.06≤h1 / H≤0.

3. [6] Battery according to one of the preceding claims, characterized by that 0.01≤(L1 / L2)*(h1 / H)≤0.

06. [7] Battery according to one of the preceding claims, characterized bythat in the first direction, a distance between an end of the reinforcing portion remote from the electrode and an end of the tab remote from the electrode is “h2” mm, where 3mm≤h2≤15mm, 0.06≤h2 / H≤0.4, 0.1≤L1 / L2≤0.

4. [8] Battery according to one of the preceding claims, characterized by that at least one side of the tab transitions in a second direction in an arc shape to the electrode and forms an arc-shaped section. [9] Battery according to claim 8, characterized by that a radius of the arcuate portion “e” is mm, where 1mm≤e≤10mm, 0.002≤(L1 / L2)*(h1 / H)≤0.

06. [10] Battery according to one of the preceding claims, characterized bythat a direction perpendicular to the plane of the tab is the third direction, in the third direction the reinforcing portion protrudes on one side of the tab, the reinforcing portion is recessed on the other side of the tab, and a gap is provided between the reinforcing portion and the side of the tab in the second direction. [11] Battery according to one of the preceding claims, characterized by that the reinforcing section extends continuously or discontinuously in the first direction. [12] Battery according to one of the preceding claims, characterized by that the cover plate has a connection terminal. [13] Battery according to claim 12, characterized by that the tab is welded to the terminal, forming a weld mark. [14] Battery according to claim 13, characterized by that the welding mark is positioned away from the cell body. [15] Battery according to claim 14, characterized by that between the tab and the cell body, the distance between the weld mark and the cell body is “L4” mm, where 10 mm≤L4≤50 mm, where (L4 / H) > (h1 / H). [16] Battery arrangement, characterized by that it comprises a battery according to one of claims 1 to 15.

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