Battery and battery device

Abstract

The utility model relates to the technical field of batteries, and provides a battery and a battery device, the battery comprises a pole, a tab and a metal sheet, the tab is positioned between the metal sheet and the pole, and the pole, the tab and the metal sheet are connected by welding; the resistivity of the metal sheet is rho (mu omega.cm), the melting point of the metal sheet is T (DEG C), the heat conductivity coefficient of the metal sheet is lambda (cal / cm.s.DEG C), rho, T and lambda meet the relational expression R = 100 rho / (T.lambda), and R is larger than or equal to 0.1 and smaller than or equal to 150. According to the arrangement, the welding effect between the tab and the pole and the welding effect between the tab and the metal sheet can be guaranteed, meanwhile, adhesion of the welding head, the tab and the metal sheet can be avoided, and the risk that the tab and the pole are fused in the later use process of the battery is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery and a battery device. Background Art

[0002] In the related art, the tabs and the poles are usually welded by a resistance welding process, which provides voltage to the tabs and the poles through two welding heads, so that the tabs and the poles are melted and welded. However, the tabs are thin and easily stick to the welding heads. When the welding heads are removed, the welding heads easily peel off or tear the tabs, thereby affecting the welding effect of the poles and the tabs.

[0003] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present disclosure, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Utility Model Content

[0004] The utility model provides a battery, which can improve the technical problem that a pole ear and a welding head are easy to stick together.

[0005] Battery Included:

[0006] Pole;

[0007] Extreme ears;

[0008] The metal sheet, the pole ear is located between the metal sheet and the pole, and the pole, the pole ear and the metal sheet are welded and connected;

[0009] The resistivity of the metal sheet is ρ (μΩ·cm), the melting point of the metal sheet is T (℃), and the thermal conductivity of the metal sheet is λ (cal / cm·s·℃), wherein ρ, T, and λ satisfy the relationship R=100ρ / (T·λ), and 0.1≤R≤150.

[0010] First, the utility model adds a metal sheet on the side of the pole ear away from the pole. When the pole 1, the pole ear 2, and the metal sheet 3 are resistance welded, the two welding heads of the resistance welding are respectively against the metal sheet and the pole. This setting can avoid the welding head and the pole ear from sticking. In addition, 100ρ / (T·λ) is too large. If ρ is too large, the current capacity of the welding place between the pole ear and the pole is small, and the welding place between the pole ear and the pole is not easy to melt and weld, which easily leads to the cold welding of the pole ear and the pole; at the same time, if λ is too small, the heat at the pole ear position is difficult to dissipate during the cycle of the battery. Due to the poor welding of the pole ear and the pole itself, the pole ear and the pole are more likely to be melted at high temperature; in addition, because T is too small, under the premise of ensuring the welding effect of the pole ear and the pole, the metal sheet melts too much, and the metal sheet is easy to stick to the welding head. 100ρ / (T·λ) is too small. If ρ is too small, the current capacity of the welding place between the pole ear and the pole column is large, and the welding place between the pole ear and the pole column is easy to melt and weld. At the same time, because T is too large, the metal sheet is not easy to melt under the premise of ensuring the welding effect of the pole ear and the pole column, and a cold weld is easy to occur between the metal sheet and the pole ear. In addition, if λ is too large, the heat on the metal sheet and the pole ear is easy to dissipate during the welding process of the metal sheet and the pole ear, which further affects the welding effect between the metal sheet and the pole ear. The utility model sets 100ρ / (T·λ) to a suitable size, which can not only ensure the welding effect between the pole ear and the pole column and between the pole ear and the metal sheet, but also avoid the sticking of the welding head and the metal sheet, and reduce the risk of melting of the pole ear and the pole column during the later use of the battery.

[0011] The utility model also provides a battery device, which comprises the battery mentioned above.

[0012] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to better understand the present disclosure, reference may be made to the embodiments shown in the following drawings. The components in the drawings are not necessarily to scale, and related elements may be omitted in order to emphasize and clearly illustrate the technical features of the present disclosure. In addition, related elements or components may have different arrangements as known in the art. In addition, in the drawings, the same reference numerals represent the same or similar components in each drawing.

[0014] in:

[0015] Figure 1 It is a schematic diagram of the partial structure of an exemplary embodiment of the battery disclosed in the present invention.

[0016] Description of reference numerals:

[0017] 1. Pole; 2. Ear; 3. Metal sheet. DETAILED DESCRIPTION

[0018] The following will be combined with the accompanying drawings in the exemplary embodiments of the present disclosure to clearly and completely describe the technical solutions in the exemplary embodiments of the present disclosure. The exemplary embodiments described herein are only for illustrative purposes and are not intended to limit the scope of protection of the present disclosure. Therefore, it should be understood that various modifications and changes can be made to the exemplary embodiments without departing from the scope of protection of the present disclosure.

[0019] In the description of the present disclosure, unless otherwise clearly specified and limited, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance; the term "plurality" refers to two or more; the term "and / or" includes any and all combinations of one or more associated listed items. In particular, reference to "the / the" object or "an" object is also intended to indicate one of a possible plurality of such objects.

[0020] Unless otherwise specified or explained, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, an integral connection, an electrical connection, or a signal connection; "connection" can be a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in this disclosure can be understood according to specific circumstances.

[0021] Further, in the description of the present disclosure, it should be understood that the directional words such as "upper", "lower", "inner", "outer" and the like described in the exemplary embodiments of the present disclosure are described at the angles shown in the accompanying drawings and should not be understood as limitations on the exemplary embodiments of the present disclosure. It should also be understood that, in the context, when it is mentioned that an element or feature is connected to one or more "upper", "lower", or "inner", "outer" of another element, it can not only be directly connected to the "upper", "lower", "inner", "outer" of another element or elements, but can also be indirectly connected to the "upper", "lower", "inner", "outer" of another element or elements through an intermediate element.

[0022] like Figure 1 The figure shows a partial structural diagram of an exemplary embodiment of the battery disclosed in the present invention. The battery comprises: a pole 1, a pole ear 2, and a metal sheet 3. The pole ear 2 is located between the metal sheet 3 and the pole 1, and the pole 1, the pole ear 2, and the metal sheet 3 are welded and connected; the resistivity of the metal sheet 3 is ρ (μΩ·cm), the melting point of the metal sheet 3 is T (℃), and the thermal conductivity of the metal sheet 3 is λ (cal / cm·s·℃), wherein ρ, T, and λ satisfy the relationship R=100ρ / (T·λ), and 0.1≤R≤150.

[0023] First, in this exemplary embodiment, a metal sheet is added to the side of the pole ear away from the pole. When the pole 1, the pole ear 2, and the metal sheet 3 are resistance welded, the two welding heads of the resistance welding are respectively against the metal sheet and the pole. This setting can avoid the welding head and the pole ear from sticking. In addition, 100ρ / (T·λ) is too large. If ρ is too large, the current capacity of the welding place between the pole ear and the pole is small, and the welding place between the pole ear and the pole is not easy to melt and weld, which easily leads to the cold welding of the pole ear and the pole. At the same time, if λ is too small, the heat at the pole ear position is difficult to dissipate during the cycle of the battery. Due to the poor welding of the pole ear and the pole itself, the pole ear and the pole are more likely to be melted at high temperature. In addition, because T is too small, under the premise of ensuring the welding effect of the pole ear and the pole, the metal sheet melts too much, and the metal sheet is easy to stick to the welding head. 100ρ / (T·λ) is too small. If ρ is too small, the welding point between the pole tab and the pole column is easy to melt and weld, but the welding temperature between the metal sheet and the pole tab is not enough, resulting in poor welding strength. At the same time, because T is too large, the metal sheet is not easy to melt under the premise of ensuring the welding effect of the pole tab and the pole column, and a cold weld is easy to occur between the metal sheet and the pole tab. In addition, if λ is too large, the heat on the metal sheet and the pole tab is easy to dissipate during the welding process of the metal sheet and the pole tab, which further affects the welding effect between the metal sheet and the pole tab. This exemplary embodiment sets 100ρ / (T·λ) to a suitable size, which can not only ensure the welding effect between the pole tab and the pole column and between the pole tab and the metal sheet, but also avoid the sticking of the welding head and the metal sheet, and reduce the risk of melting of the pole tab and the pole column during the later use of the battery.

[0024] In this exemplary embodiment, R may be equal to 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, 140, 150, etc.

[0025] In the present exemplary embodiment, the thickness of the metal sheet 3 is c (mm), wherein 0.05≤c / λ≤30. For example, c / λ may be equal to 0.05, 0.06, 0.07, 0.08, 0.09, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, etc.

[0026] If c / λ is too large, the thickness of the metal sheet 3 is too large, the thermal conductivity of the metal sheet 3 is too small, and the nugget will be too close to the position of the metal sheet 3 during the integrated welding of the pole 1, the pole lug 2, and the metal sheet 3, thereby reducing the welding strength of the pole lug 2 and the pole 1; if c / λ is too small, the thickness of the metal sheet 3 is too small, the thermal conductivity of the metal sheet 3 is too large, and the nugget will be too close to the position of the pole 1 during the integrated welding of the pole 1, the pole lug 2, and the metal sheet 3, thereby also reducing the welding strength of the pole lug 2 and the pole 1, but reducing the fixing strength between the metal sheet 3 and the pole lug 2. This exemplary embodiment sets c / λ to a suitable size, which can improve the welding strength between the pole lug 2 and the pole 1.

[0027] In this exemplary embodiment, preferably, 0.1≤c / λ≤8. For example, c / λ may be equal to 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1, 1.2, 1.4, 1.6, 1.8, 2, 2.2, 2.4, 2.6, 2.8, 3, 3.2, 3.4, 3.6, 3.8, 4, 4.2, 4.4, 4.6, 4.8, 5, 5.2, 5.4, 5.6, 5.8, 6, 7.2, 7.4, 7.6, 7.8, 8, etc.

[0028] In the present exemplary embodiment, 0.05≤c·ρ / λ≤1000. For example, c·ρ / λ may be equal to 0.05, 0.06, 0.07, 0.08, 0.09, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 200, 300, 400, 500, 600, 700, 800, 900, 1000, etc.

[0029] In this exemplary embodiment, the resistivity of the metal sheet 3 also has a certain influence on the position of the nugget. If c·ρ / λ is too small, the resistivity of the metal sheet 3 is too small, and the nugget will be too close to the position of the metal sheet, thereby reducing the welding strength between the pole tab and the pole; if c·ρ / λ is too large, the resistivity of the metal sheet 3 is too large, and the nugget will be too close to the position of the pole 1, thereby also reducing the welding strength between the pole tab 2 and the pole 1. In this exemplary embodiment, c·ρ / λ is set to a suitable value, which can improve the welding strength between the pole tab 2 and the pole 1.

[0030] In this exemplary embodiment, preferably, 0.15≤c·ρ / λ≤600. For example, c·ρ / λ can be equal to 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 120, 140, 160, 180, 200, 220, 240, 260, 280, 300, 320, 340, 360, 380, 400, 420, 440, 460, 480, 500, 520, 540, 560, 580, 600, etc.

[0031] In this exemplary embodiment, the area of ​​the weld mark formed between the tab 2 and the metal sheet 3 is S, and S is 5 mm. 2 ~80mm 2 , for example, S can be equal to 5mm 2 、6mm 2 , 7mm 2 , 8mm 2 , 9mm 2 , 10mm 2 , 20mm 2 , 30mm 2 , 40mm 2 , 50mm 2 、60mm 2 , 70mm 2 , 80mm 2 R is 0.15 to 5, for example, R can be equal to 0.15, 0.2, 0.3, 0.4, 0.5, etc. For the case where the weld area is in this range, when the R value is too large, the metal sheet cannot be well fixed to one side of the tab, and when the R value is too small, the metal sheet is easily adhered to the welding hair during welding. This exemplary embodiment sets R in a suitable range, so that the welding effect of the metal sheet and the tab can be improved.

[0032] It should be noted that the weld mark between the pole lug 2 and the metal sheet 3 can be a whole mark formed on the pole lug and / or the metal sheet, and the weld mark area between the pole lug 2 and the metal sheet 3 is the area of ​​the region where the whole mark is located; the weld mark between the pole lug 2 and the metal sheet 3 can also be multiple point marks formed on the pole lug and / or the metal sheet, and the weld mark area between the pole lug 2 and the metal sheet 3 is the area of ​​the region surrounded by the multiple point marks, and the region surrounded by the multiple point marks is a polygon with the point marks as the vertices, and all the point marks are located on the edge or inside the polygon.

[0033] In the present exemplary embodiment, p is 1 to 80, and T is 500 to 1800. For example, p may be equal to 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32, 34, 36, 38, 40, 42, 44, 46, 48, 50, 52, 54, 56, 58, 60, 62, 64, 66, 68, 70, 72, 74, 76, 78, 80, etc. T can be equal to 500, 550, 600, 650, 700, 750, 800, 850, 900, 950, 1000, 1050, 1100, 1150, 1200, 1250, 1300, 1350, 1400, 1450, 1500, 1550, 1600, 1750, 1800, etc.

[0034] In this exemplary embodiment, the thickness of the tab 2 is d (mm), the thickness of the metal sheet 3 is c (mm), and d / c is 0.03 to 30. For example, d / c can be equal to 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, 0.09, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, etc.

[0035] In this exemplary embodiment, if d / c is too small, the thickness of the metal sheet 3 is too large, and the welding energy required for welding the metal sheet 3, the pole lug 2, and the pole 1 is too large, which easily causes the insulating member between the pole and the cover plate to melt; if d / c is too large, the thickness of the metal sheet 3 is too small, and the metal sheet 3 itself is easy to melt, which easily causes the metal sheet 3 and the welding head to stick. In this exemplary embodiment, d / c is set to an appropriate size, which can prevent the metal sheet 3 from sticking to the welding head and also prevent the insulating member between the pole 1 and the cover plate from melting.

[0036] In this exemplary embodiment, preferably, d / c can be 0.2 to 30. For example, d / c can be equal to 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, etc.

[0037] In this exemplary embodiment, the melting point of the metal sheet 3 may be greater than or equal to the melting point of the electrode tab 2. This arrangement may further reduce the risk of the metal sheet 3 and the welding head sticking to each other.

[0038] In this exemplary embodiment, the resistivity of the metal sheet 3 may be greater than or equal to the resistivity of the tab 2. This arrangement can improve the fixed connection strength between the metal sheet and the tab, and prevent the metal sheet and the tab from falling off during use.

[0039] It should be noted that a battery includes a cell and an electrolyte, and a battery is the smallest unit capable of performing electrochemical reactions such as charge / discharge. A cell refers to a unit formed by winding or laminating a stacked portion, wherein the stacked portion includes a first pole sheet, a separator, and a second pole sheet. When the first pole sheet is a positive pole sheet, the second pole sheet is a negative pole sheet. The polarities of the first pole sheet and the second pole sheet can be interchanged. The first pole sheet and the second pole sheet are coated with an active material.

[0040] In this exemplary embodiment, the battery may be a lithium-ion battery. It should be understood that in other exemplary embodiments, the battery may also be a nickel-cadmium battery, a nickel-metal hydride battery, a lithium polymer battery, a sodium-ion battery, a solid-state battery, etc.

[0041] In other exemplary embodiments, the battery may be a square battery, that is, the battery may be a quadrangular prism-type battery. The quadrangular prism-type battery mainly refers to a battery having a prism-shaped appearance, but does not strictly limit whether each side of the prism must be a straight line in the strict sense, and the corners between the sides are not necessarily right angles, and may be arc transitions.

[0042] The battery can be a laminated battery, which is not only convenient to group, but also can be processed to obtain a longer battery. Specifically, the battery cell is a laminated battery cell, which has a first pole piece stacked on top of each other, a second pole piece with electrical properties opposite to the first pole piece, and a diaphragm sheet arranged between the first pole piece and the second pole piece, so that multiple pairs of first pole pieces and second pole pieces are stacked to form a laminated battery cell.

[0043] Alternatively, the battery may be a wound battery, that is, a first pole sheet, a second pole sheet with electrical properties opposite to the first pole sheet, and a diaphragm sheet arranged between the first pole sheet and the second pole sheet are wound to obtain a wound battery cell.

[0044] The exemplary embodiment further provides a battery device, which is a battery module or a battery pack.

[0045] The battery module includes a plurality of batteries, which may be square batteries, and the battery module may further include end plates and side plates, which are used to fix the plurality of batteries. The batteries may be cylindrical batteries, which may be arranged on a support plate to form a battery module.

[0046] The battery pack includes a plurality of batteries and a box body, and the box body is used to fix the plurality of batteries.

[0047] It should be noted that the battery pack includes a battery, and the battery may be multiple, and the multiple batteries are arranged in the box. Among them, the multiple batteries can be installed in the box after forming a battery module. Alternatively, the multiple batteries can be directly arranged in the box, that is, there is no need to group the multiple batteries, and the box is used to fix the multiple batteries.

[0048] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing what is disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include common knowledge or customary technical means in the art that are not disclosed in the present disclosure. The specification and embodiments are to be considered merely as exemplary, and the true scope and spirit of the present disclosure are indicated by the claims.

[0049] The drawings in the present disclosure only relate to the structures involved in the present disclosure, and other structures may refer to the usual design. In the absence of conflict, the embodiments of the present disclosure and the features in the embodiments may be combined with each other to obtain new embodiments. It should be understood by those of ordinary skill in the art that the technical solutions of the present disclosure may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present disclosure, and should be included in the scope of the claims of the present disclosure.

[0050] It should be understood that the present disclosure is not limited to the exact structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A battery, characterized in that: The battery comprises: Pole (1); Tabs (2); A metal sheet (3), wherein the pole ear (2) is located between the metal sheet (3) and the pole (1), and the pole (1), the pole ear (2), and the metal sheet (3) are connected by welding; The resistivity of the metal sheet (3) is ρ (μΩ·cm), the melting point of the metal sheet (3) is T (°C), and the thermal conductivity of the metal sheet (3) is λ (cal / cm·s·°C), wherein ρ, T, and λ satisfy the relationship R=100ρ / (T·λ), and 0.1≤R≤150.

2. The battery according to claim 1, characterized in that The thickness of the metal sheet (3) is c (mm), wherein 0.05≤c / λ≤30.

3. The battery according to claim 2, characterized in that 0.1≤c / λ≤8.

4. The battery according to claim 1, characterized in that The thickness of the metal sheet (3) is c (mm), 0.05≤c·ρ / λ≤1000.

5. The battery according to claim 1, characterized in that The area of ​​the weld mark formed between the tab (2) and the metal sheet (3) is S, and S is 5 mm 2 ~80mm 2 , R is 0.15~5.

6. The battery according to claim 1, characterized in that ρ is 1~80, and T is 500~1800.

7. The battery according to any one of claims 1 to 6, characterized in that: The thickness of the pole ear (2) is d (mm), the thickness of the metal sheet (3) is c (mm), and d / c is 0.03 to 30.

8. The battery according to any one of claims 1 to 6, characterized in that: The melting point of the metal sheet (3) is greater than or equal to the melting point of the electrode tab (2).

9. The battery according to any one of claims 1 to 6, characterized in that: The resistivity of the metal sheet (3) is greater than or equal to the resistivity of the electrode tab (2).

10. A battery device, characterized in that: The battery device comprises the battery according to any one of claims 1 to 9.

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