Battery and electric device

Abstract

The utility model relates to a battery and an electric device. Comprising a shell provided with an accommodating cavity; the battery cell is positioned in the accommodating cavity; the confluence plate is positioned in the accommodating cavity and is electrically connected with a tab of the battery cell; the cover plate is arranged at one end of the shell in a covering manner and is electrically connected with the convergence disc in a welding manner; the welding intermediary piece is located between the confluence disc and the cover plate and connected with the confluence disc and the cover plate in a welded mode so that the confluence disc and the cover plate can be electrically connected; and the material of the welding intermediate piece is the same as that of the cover plate. According to the technical scheme, the technical problem that the welding quality of the negative collector plate and the cover plate is unstable can be solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a battery and a power utilization device. BACKGROUND

[0002] Cylindrical batteries are a kind of battery with high capacity, long cycle life and wide use environment temperature. In recent years, automobile manufacturers have also actively laid out cylindrical power batteries. Cylindrical power batteries can improve battery performance and are expected to have advantages in energy density, safety, fast charging capability, cost and life.

[0003] The welding of the negative electrode bus bar and the cover plate of the cylindrical battery is laser penetration welding, and the penetration direction is from the cover plate to the bus bar. Since the material of the cover plate is usually steel and the material of the negative electrode bus bar is usually copper, it belongs to dissimilar material welding, which is difficult to weld. Moreover, the thickness of the cover plate is usually greater than that of the bus bar, and the penetration welding from the thick plate to the thin plate also has great welding difficulty. Based on the above two reasons, the welding of the negative electrode bus bar and the cover plate has the technical problem of unstable quality. CONTENT OF THE UTILITY MODEL

[0004] Therefore, the present application provides a battery and a power utilization device to solve at least one problem in the background art.

[0005] To achieve the above-mentioned purposes, the technical scheme of the present application is as follows:

[0006] In a first aspect, the present application provides a battery, comprising:

[0007] a shell having a receiving cavity;

[0008] a cell located in the receiving cavity;

[0009] a bus bar located in the receiving cavity and electrically connected to the tab of the cell;

[0010] a cover plate covering one end of the shell and electrically connected to the bus bar by welding;

[0011] a welding intermediate piece located between the bus bar and the cover plate and welded to both the bus bar and the cover plate to establish electrical connection between the bus bar and the cover plate; the material of the welding intermediate piece is the same as that of the cover plate.

[0012] In some embodiments, the thickness of the welding intermediate piece is less than or equal to the thickness of the connecting part of the bus bar, and the connecting part is the part of the bus bar abutting and welded to the welding intermediate piece.

[0013] In some embodiments, the welding intermediary and the busbar are welded to form a first welding portion, the first welding portion extends along a first direction, penetrates the welding intermediary, and extends into the busbar, the first direction being a thickness direction of the welding intermediary.

[0014] In some embodiments, the thickness of the welding intermediary is 1 / 4-2 / 3 of the thickness of the connecting portion of the busbar.

[0015] In some embodiments, the welding intermediary is an annular member or a plurality of arc-shaped members distributed in a circumferential direction on the busbar.

[0016] In some embodiments, the welding intermediary and the busbar are welded to form a second welding portion, the second welding portion being formed at an outer edge of the welding intermediary and the busbar.

[0017] In some embodiments, the area of the busbar contacting the welding intermediary is convex to the welding intermediary, forming a first convex portion.

[0018] In some embodiments, the area of the cover plate contacting the welding intermediary is concave to the welding intermediary, forming a first concave portion, a bottom of the first concave portion abutting the welding intermediary.

[0019] In some embodiments, the area of the cover plate contacting the welding intermediary is convex to the welding intermediary, forming a second convex portion.

[0020] In a second aspect, the embodiments of the present application provide a power consuming device, comprising any one of the above-mentioned batteries.

[0021] The battery and the power consuming device provided by the embodiments of the present application can solve the technical problem of unstable welding quality of the negative busbar and the cover plate by arranging a welding intermediary between the busbar and the cover plate, the welding intermediary being arranged between the busbar and the cover plate and being welded to the busbar and the cover plate to establish electrical connection between the busbar and the cover plate, the welding intermediary being made of the same material as the cover plate, which can solve the problem of difficult welding process of dissimilar materials and is conducive to improving the welding quality.

[0022] Additional aspects and advantages of the present application will be better understood from the following description with reference to the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0023] The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:

[0024] Figure 1 A cross-sectional view of a first battery according to an embodiment of the present application;

[0025] Figure 2 A cross-sectional view of a first battery according to an embodiment of the present application; Figure 1

[0026] Figure 3 A cross-sectional view of a first battery according to an embodiment of the present application; Figure 2 Figure 1

[0027] Figure 4 A cross-sectional view of a first battery according to an embodiment of the present application; Figure 2 Figure 2

[0028] Figure 5 A cross-sectional view of a second battery according to an embodiment of the present application;

[0029] Figure 6 A cross-sectional view of a second battery according to an embodiment of the present application; Figure 5

[0030] A cross-sectional view of a second battery according to an embodiment of the present application; Figure 7

[0031] A cross-sectional view of a second battery according to an embodiment of the present application; Figure 8

[0032] A cross-sectional view of a third battery according to an embodiment of the present application; Figure 9

[0033] A cross-sectional view of a third battery according to an embodiment of the present application; Figure 10 Figure 9 A cross-sectional view of a third battery according to an embodiment of the present application;

[0034] Figure 11 A cross-sectional view of a third battery according to an embodiment of the present application.

[0035] BRIEF DESCRIPTION OF DRAWINGS

[0036] 10, housing; 20, battery cell; 30, busbar; 31, first protrusion; 32, welding wire; 40, cover plate; 41, first recess; 42, second protrusion; 43, third protrusion; 44, second recess; 50, welding intermediate member; 61, first welding portion; 62, second welding portion; 63, third welding portion; 64, fourth welding portion. DETAILED DESCRIPTION

[0037] ​​​​​​In order to make the technical solutions and beneficial effects of the present application more obvious and easy to understand, the following will be described in detail by listing specific embodiments. The drawings are not necessarily drawn to scale, and local features can be enlarged or reduced to more clearly show the details of the local features; unless otherwise defined, the technical and scientific terms used herein have the same meaning as the technical and scientific terms in the technical field to which the present application belongs.

[0038] In the description of the present application, the orientations or positional relationships indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "height", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of the simplified description of the present application, and do not indicate that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, i.e. cannot be understood as limiting the present application.

[0039] In the present application, the terms "first" and "second" are only used for the purpose of clear description, and cannot be understood as the relative importance of the indicated features or the number of the indicated technical features. Therefore, the features defined with "first" and "second" can explicitly include at least one of the features. In the description of the present application, the meaning of "multiple" is at least two, such as two, three, etc.; the meaning of "several" is at least one, such as one, two, three, etc.; unless otherwise specifically limited.

[0040] In the present application, unless otherwise explicitly defined, the terms "mounting", "connecting", "connecting", "fixing", "setting" and the like should be broadly understood. For example, "connecting" can be fixed connection, or detachable connection, or integral; can be mechanical connection, or electrical connection; can be directly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0041] In the present application, unless otherwise explicitly defined, the first feature is "on", "over", "above" and "on top of", "under", "below", "under" or "under" the second feature can be the first feature and the second feature directly contact, or the first feature and the second feature indirectly contact through an intermediate medium. Moreover, the first feature is "on", "over" and "above" the second feature can be the first feature directly above or obliquely above the second feature, or just indicates that the horizontal height of the first feature is higher than the horizontal height of the second feature. The first feature is "below", "below" and "below" the second feature can be the first feature directly below or obliquely below the second feature, or just indicates that the horizontal height of the first feature is less than the horizontal height of the second feature.

[0042] For a thorough understanding of the present application, detailed steps and detailed structures will be presented in the following description in order to illustrate the technical solutions of the present application. The preferred embodiments of the present application are described in detail as follows, however, in addition to these detailed descriptions, the present application can also have other implementation manners.

[0043] The utility model discloses a kind of electric device and battery, above-mentioned electric device includes above-mentioned battery, and can be provided with electric energy by above-mentioned battery. Among them, above-mentioned electric device can be vehicle, portable electronic device, electric toy, electric tool, energy storage device, amusement device, elevator and lifting equipment etc. Vehicle can include car, ship, aircraft and spacecraft etc.;Car can be fuel car, gas car or new energy car etc., and new energy car can be pure electric car, hybrid car or range extended car etc.;Aircraft includes airplane, balloon and airship etc.;Spacecraft includes rocket, space shuttle and spaceship etc.;Portable electronic device can include mobile phone, notebook computer, tablet computer and digital camera etc.;Electric toy includes fixed or mobile electric toy, for example, game machine, electric car toy, electric ship toy or electric aircraft toy etc.;Electric tool includes metal cutting electric tool, grinding electric tool, assembly electric tool and railway electric tool etc., for example, electric drill, electric grinder, electric wrench, electric screwdriver, electric hammer, impact drill, concrete vibrator and electric planer etc.;Energy storage device can be energy storage wall, base station energy storage, container energy storage etc.;Amusement device can be carousel, jump machine etc. The present application does not make special restriction to above-mentioned electric device.

[0044] For new energy car, above-mentioned battery can be used as driving power supply, to replace fossil fuel to provide driving power.

[0045] Reference Figures 1-3 , the battery includes:

[0046] Shell 10 has accommodating cavity;

[0047] Battery cell 20 is located in the accommodating cavity.

[0048] The busbar 30 is located in the accommodating cavity and electrically connected with the tab of the battery cell 20.

[0049] The cover plate 40 is arranged at one end of the shell 10 and electrically connected with the busbar 30 by welding.

[0050] The welding intermediate piece 50 is located between the busbar 30 and the cover plate 40 and is welded with the busbar 30 and the cover plate 40 to establish electrical connection between the busbar 30 and the cover plate 40. The welding intermediate piece 50 is made of the same material as the cover plate 40.

[0051] The shell 10 is in a cylindrical structure, specifically a cylindrical shape. The shell 10 can be an aluminum shell or a steel shell, and the steel shell is used in the embodiment to have higher structural strength. The shell 10 is usually provided with an opening at one end, which can accommodate the battery cell 20 and the busbar 30. The cover plate 40 is arranged at one end of the opening of the shell 10 and seals the opening. In addition, the shell 10 is generally provided with a pole (not shown) at the end away from the cover plate 40. The battery cell 20 is the core component of the battery and is accommodated in the shell 10. The battery cell 20 is generally composed of a positive electrode sheet, a negative electrode sheet, and a separator for insulation between the positive electrode sheet and the negative electrode sheet. The separator can be formed by winding. Specifically, the battery cell 20 in the embodiment is in a cylindrical shape, and the positive tab and the negative tab are arranged at the two ends, respectively.

[0052] Generally, the positive tab of the battery cell 20 is electrically connected with the pole through the positive busbar, and the negative tab is electrically connected with the cover plate 40 through the negative busbar, so that the pole and the cover plate 40 will be the positive terminal and the negative terminal of the battery, respectively. Of course, the positions of the positive tab and the negative tab of the battery cell 20 can also be reversed. That is, the positive tab is electrically connected with the cover plate 40 through the positive busbar, and the negative tab is electrically connected with the pole through the negative busbar, so that the pole and the cover plate 40 will be the negative terminal and the positive terminal of the battery, respectively. The embodiment takes the busbar 30 as the negative busbar as an example for explanation.

[0053] The materials of the cover plate 40 and the busbar 30 are different. The material of the positive busbar is usually copper, the material of the negative busbar is usually aluminum, and the material of the cover plate is usually steel or aluminum. In the embodiment, the material of the cover plate 40 is steel, and the material of the busbar 30 is copper. In other embodiments, the material of the cover plate 40 can be aluminum. Since the welding of the cover plate 40 and the busbar 30 is dissimilar material welding, the welding is difficult. In the embodiment, the welding intermediate piece 50 is arranged between the busbar 30 and the cover plate 40, the welding intermediate piece 50 is welded to the busbar 30, and the welding intermediate piece 50 is welded to the cover plate 40. The material of the welding intermediate piece 50 is the same as that of the cover plate 40, which can solve the problem of difficult dissimilar material welding process. Compared with the cover plate 40 and the busbar 30, the welding intermediate piece 50 has lower requirements for thickness and welding mode, so the thickness of the welding intermediate piece 50 can be reduced or the welding mode is not affected by the thickness of the welding piece, thereby reducing the welding process difficulty of the welding intermediate piece 50 and the busbar 30.

[0054] Further, the thickness of the welding intermediate piece 50 is less than or equal to the thickness of the connecting portion of the busbar 30. The connecting portion is the portion where the busbar 30 and the welding intermediate piece 50 abut and are welded.

[0055] The busbar 30 and the welding intermediate piece 50 can be connected by laser penetration welding. The laser penetration direction is from the welding intermediate piece 50 to the busbar 30.

[0056] In this way, when the welding intermediate piece 50 and the busbar 30 are penetrated and welded, since the thickness of the welding intermediate piece 50 is less than or equal to the thickness of the connecting portion of the busbar 30, it belongs to the penetration of a thin plate to a thick plate, the power is small, the stress is small, the risk of welding cracking is small, and the process difficulty of penetration welding is reduced.

[0057] Specifically, referring to Figure 3 , the welding intermediate piece 50 and the busbar 30 are welded to form a first welding portion 61. The first welding portion 61 extends in a first direction, penetrates the welding intermediate piece 50, and extends into the busbar 30. The first direction is the thickness direction of the welding intermediate piece 50.

[0058] Further, the third welding portion 63 formed by the welding intermediate piece 50 and the cover plate 40 does not coincide with the first welding portion 61, avoiding interference.

[0059] More specifically, the thickness of the welding intermediate piece 50 is 1 / 4 to 2 / 3, or 1 / 3 to 1 / 2, of the thickness of the connecting portion of the busbar 30, for example, 1 / 4, 5 / 12, 1 / 2, 7 / 12, 2 / 3, including but not limited to the above-mentioned ratios, other ratio relationships within the ratio range are also applicable. Limiting the thickness ratio within the above range can reduce the welding process difficulty and also have certain connection strength.

[0060] And / or, the difference between the thickness of the welding intermediate 50 and the thickness of the connecting portion of the busbar 30 is 0.1mm-0.5mm, for example, it can be 0.1mm, 0.15mm, 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.45mm or 0.5mm, including but not limited to the listed values, and other values ​​within the range are also applicable. Limiting the thickness difference to the above range reduces the difficulty of the welding process while still achieving a certain connection strength.

[0061] In another embodiment, the welding intermediary is welded to the busbar to form a second weld portion, the second weld portion being formed at the outer edge of the junction of the welding intermediary and the busbar.

[0062] That is, the welding method for the welding intermediate component 50 and the busbar 30 is seam welding. For example... Figure 4 As shown, welding is performed from the outer edge of the welding intermediary 50 that contacts the manifold 30, forming a second weld portion 62. This second weld portion 62 extends from this outer edge into both the welding intermediary 50 and the manifold 30. Because this welding method does not require complete penetration of the welding intermediary 50 along its thickness direction, the welding quality is not affected by the thickness of the welding intermediary 50; even if the welding intermediary 50 is thick, the welding quality can be maintained. Furthermore, since the second weld portion 62 is located at the outer edge of the welding intermediary 50, the welding position between the cover plate 40 and the welding intermediary 50 can be at the middle of the welding intermediary 50, forming a fourth weld portion 64. This increases the distance between the first weld portion 64 and the second weld portion 62, avoiding interference.

[0063] In some other embodiments of this application, the welding intermediary 50 is an annular component or a plurality of circumferentially spaced arc-shaped components located on the busbar 30. When the welding intermediary 50 is an annular component, if a through-welding method is used, the welding trajectory is also annular, and the number of welding trajectories can be one, two, or more, depending on the actual situation. When a seam welding method is used, the welding trajectory is also annular, circling the edge where the welding intermediary 50 contacts the busbar 30. To ensure connection reliability, welding can be performed on the inner and outer edges of the annular component. When the welding intermediary 50 is an arc-shaped component, if a through-welding method is used, the welding trajectory can be along the extension direction of the arc-shaped component, and the number can be one, two, or more, depending on the actual situation. When a seam welding method is used, the welding trajectory circles the edge where the welding intermediary 50 contacts the busbar 30.

[0064] It can be understood that the annular member facilitates simplifying the assembly process, for example, the welding does not need to consider the circumferential position of the welding intermediate member 50, and the welding process is simple. The plurality of arc-shaped members can reduce the weight of the battery.

[0065] In some embodiments of the present application, with reference to Figure 5 and Figure 6 The area of the busbar 30 contacting the welding intermediate member 50 is convex to the welding intermediate member 50, forming a first convexity 31. In this way, it is helpful to improve the fit between the busbar 30 and the welding intermediate member 50 and improve the welding quality.

[0066] Further, the plurality of first convexities 31 are circumferentially uniformly distributed on the surface of the busbar 30, and correspondingly, the welding intermediate member 50 is provided with the plurality of first convexities 31. With reference to Figure 7 , the first convexity 31 is circumferentially uniformly distributed on the surface of the busbar 30, and the welding intermediate member 50 is also uniformly distributed, and the welding wire 32 can extend to an area closer to the outer edge of the busbar 30. This design provides more available space for welding between the tab and the busbar 30, thereby ensuring that all tabs from the inner ring to the outer ring can be effectively welded, thereby significantly improving the overcurrent capacity of the battery.

[0067] In some embodiments of the present application, the area of the cover plate 40 contacting the welding intermediate member 50 is recessed away from the welding intermediate member 50, forming a first recess 41; the bottom of the first recess 41 abuts the welding intermediate member 50. Therefore, the welding intermediate member 50 is limited between the bottom of the first recess 41 and the end wall of the first convexity 31, which can not only avoid the risk of deviation of the welding intermediate member 50, but also improve the fit between the welding intermediate member 50 and the first recess 41 / first convexity 31, thereby improving the welding quality. In addition, it is also convenient to judge whether they are fit by visual positioning and height difference detection to improve the welding quality.

[0068] Without limitation, the battery without the first recess 41 is the first battery provided by the embodiments of the present application, and the shape of the first battery is shown in Figure 1 The battery provided with the first recess 41 is the second battery provided by the embodiments of the present application, and the shape of the second battery is shown in Figure 8 It can be understood that, due to the use of the stamping process in the stamping process for processing the first recess 41, the first recess 41 appears as a third convexity 43 protruding from the outer surface of the cover plate 40 in shape.

[0069] In some embodiments of the present application, with reference to Figures 9-11The area of the cover plate 40 contacting the welding intermediate member 50 is raised towards the welding intermediate member 50 to form a second protrusion 42. The welding intermediate member 50 is limited between the second protrusion 42 and the first protrusion 31, which avoids the risk of the welding intermediate member 50 being deviated and improves the fitting degree of the welding intermediate member 50 with the first protrusion 31 / second protrusion 42, thereby improving the welding quality. In addition, compared with the first groove 41 described above, the formation of the second protrusion 42 makes the outer end surface of the cover plate 40 concave, so that the welding position is not easily affected by external impact and the like to affect the welding quality.

[0070] Without limitation, the battery provided with the second protrusion 42 is the third battery provided in the embodiments of the present application, and the outer shape of the second battery is referred to Figure 11 It can be understood that, since the stamping process is used to process the second protrusion 42, the second protrusion 42 appears as a second groove 44 concave in the cover plate 40 in terms of the outer shape.

[0071] It should be noted that the welding intermediate member 50 is an annular member or a plurality of arc-shaped members distributed in a circumferential direction on the busbar 30. The area of the busbar 30 contacting the welding intermediate member 50 is raised towards the welding intermediate member 50 to form a first protrusion 31. The area of the cover plate 40 contacting the welding intermediate member 50 is recessed away from the welding intermediate member 50 to form a first groove 41. The area of the cover plate 40 contacting the welding intermediate member 50 is raised towards the welding intermediate member 50 to form a second protrusion 42. The technical features of the above embodiments can be combined with each other.

[0072] It should be understood that the above embodiments are exemplary and are not intended to include all possible implementation manners of the technical solutions of the present application. Various modifications and changes can be made on the basis of the above embodiments without departing from the scope of the present application. Similarly, any combination of the technical features of the above embodiments can be made to form another embodiment of the present application which can not be explicitly described. Therefore, the above embodiments only express several implementation manners of the present application and do not limit the protection scope of the patent of the present application.

Claims

1. A battery, characterized in that, include: The housing has a receiving cavity; The battery cell is located within the accommodating cavity; The busbar is located within the accommodating cavity and is electrically connected to the tabs of the battery cell; A cover plate is placed over one end of the housing and electrically connected to the manifold by welding. A welding intermediary is located between the manifold and the cover plate, and is welded to both the manifold and the cover plate to establish an electrical connection between the manifold and the cover plate; the material of the welding intermediary is the same as that of the cover plate.

2. The battery according to claim 1, characterized in that, The thickness of the welding intermediary is less than or equal to the thickness of the connecting part of the manifold, and the connecting part is the part where the manifold and the welding intermediary abut and are welded.

3. The battery according to claim 2, characterized in that, The welding intermediary is welded to the manifold to form a first welded portion, which extends along a first direction, penetrates the welding intermediary, and extends into the manifold; the first direction is the thickness direction of the welding intermediary.

4. The battery according to claim 2, characterized in that, The thickness of the welding intermediate is 1 / 4 to 2 / 3 of the thickness of the connecting part of the manifold.

5. The battery according to claim 1, characterized in that, The welding intermediary is a ring-shaped component or a plurality of circumferentially spaced arc-shaped components located on the manifold.

6. The battery according to claim 1, characterized in that, The welding intermediate component is welded to the manifold to form a second welded portion, which is formed at the outer edge of the junction between the welding intermediate component and the manifold.

7. The battery according to claim 1, characterized in that, The area where the manifold contacts the welding intermediate protrudes towards the welding intermediate, forming a first protrusion.

8. The battery according to claim 1, characterized in that, The area of ​​the cover plate that contacts the welding intermediate is recessed in a direction away from the welding intermediate to form a first groove; the bottom of the first groove abuts against the welding intermediate.

9. The battery according to claim 1, characterized in that, The area of ​​the cover plate that contacts the welding intermediate protrudes towards the welding intermediate, forming a second protrusion.

10. An electrical device, characterized in that, Includes the battery as described in any one of claims 1-9.

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