CURRENT COLLECTING PLATE, BATTERY, BATTERY MODULE, AND BATTERY PACK

A current collecting plate provided in embodiments of the present application includes an electrode tab connector configured to electrically connected to a battery cell. A plurality of battery cell escaping slots are provided on an outer peripheral wall of the electrode tab connector, and the plurality of battery cell escaping slots are spaced from each other. An electrode tab protruding end is provided between adjacent two battery cell escaping slots, and an isolation space is defined between the electrode tab protruding end and the battery cell. The battery cell escaping slots spaced from each other are provided in the outer peripheral wall of the electrode tab connector.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims priority to Chinese Patent Application No. 202221374419.X, filed on Jun. 2, 2022, which is incorporated by reference in the present application in its entirety.

TECHNICAL FIELD

The present application relates to the technical field of battery technology, for example to a current collecting plate, a battery, a battery module, and a battery pack.

BACKGROUND

For users, big cylindrical batteries have fewer parts, and higher battery production efficiency and assembly efficiency. In the manufacturing processes of a cylindrical battery, it is generally necessary to attach a negative current collecting plate to a lower end face of a battery cell to realize electrical connection between the negative current collecting plate and a negative electrode tab of the battery cell. As the negative collector disk is tightly attached at a bottom of the battery cell, when encapsulating a battery, pressure is applied to encapsulating positions, which forces the negative current collecting plate to press the battery cell. It is easy to damage the battery cell, thereby reducing yield rate.

Thus, it is necessary to provide a current collecting plate, a battery, a battery module, and a battery pack to solve the above-mentioned problems.

SUMMARY

A current collecting plate, a battery, a battery module, and a battery pack are provided in the present application to avoid damage to battery cells during encapsulating process and improve yield rate.

In a first aspect, embodiments of the present application provide a current collecting plate, including:an electrode tab connector configured to electrically connect to a battery cell, wherein a plurality of battery cell escaping slots are provided on an outer peripheral wall of the electrode tab connector, and the plurality of battery cell escaping slots are spaced from each other, wherein an electrode tab protruding end is provided between adjacent two battery cell escaping slots, and an isolation space is defined between the electrode tab protruding end and the battery cell.

In an embodiment, the electrode tab connector is recessed towards a direction away from the battery cell to form a reinforcing protrusion.

In an embodiment, the reinforcing protrusion is arc-shaped, a plurality of reinforcing protrusions are provided, and the plurality of reinforcing protrusions are spaced from each other along a peripheral direction of the electrode tab connector.

In an embodiment, the current collecting plate further includes:a housing connector connected to the electrode tab connector and configured to electrically connect to the housing, wherein the housing connector is provided on a side of each of the plurality of battery cell escaping slots away from the battery cell and directly faces the battery cell escaping slots.

In an embodiment, the outer peripheral wall of the electrode tab connector is stamped and bent towards a direction away from the battery cell to form the housing connector, and the battery cell escaping slots are provided on a side of the housing connector towards the battery cell.

In an embodiment, a height of the reinforcing protrusion in a direction away from the battery cell is lower than heights of the housing connector in a direction away from the battery cell.

In an embodiment, a buffer corrugation is provided on the housing connector.

In a second aspect, a battery is provided by the embodiments of the present application, including a housing and a battery disposed in the housing, wherein the battery includes the current collecting plate above described, and the current collecting plate is configured to electrically connect to the housing and the battery cell.

In an embodiment, an outer peripheral wall of the battery is provided with an annular slot, and the isolation space is defined between the electrode tab protruding end and the battery cell.

In an embodiment, the current collecting plate further includes:an explosion-proof sheet covering on a side of the battery cell away from the current collecting plate and sealing an opening of the housing.

In a third aspect, a battery module is provided by the embodiments of the present application, including the battery above described.

In a fourth aspect, a battery pack is provided by the embodiments of the present application, including at least one battery module above described.

Beneficial Effects According to the Embodiments

According to the current collecting plate provided by the embodiments, the plurality of battery cell escaping slots are provided on the outer peripheral wall of the electrode tab connector and spaced from each other, the electrode tab protruding end is provided between the adjacent two battery cell escaping slots, and the isolation space is defined between the electrode tab protruding end and the battery cell, thereby reducing a bonding area between the outer peripheral wall of the electrode tab connector and the battery cell. When encapsulating the battery, the electrode tab connector is prevented from pressing and damaging the battery cell due to the pressure at the encapsulating positions, thereby improving yield rate.

According to the battery provided by the embodiments, and the current collecting plate is applied. When encapsulating the battery, the electrode tab connector is prevented from pressing and damaging the battery cell due to the pressure at the encapsulating positions, thereby improving yield rate.

According to the battery module provided by the embodiments, and the battery is applied. When encapsulating the battery, the electrode tab connector is prevented from pressing and damaging the battery cell due to the pressure at the encapsulating positions, thereby improving yield rate.

According to the battery pack provided by the embodiments, and the current collecting plate is applied. When encapsulating the battery, the electrode tab connector is prevented from pressing and damaging the battery cell due to the pressure at the encapsulating positions, thereby improving yield rate.

REFERENCE NUMERALS

DETAILED DESCRIPTION OF THE EMBODIMENT

In the description of the present application, unless otherwise specified and limited, the terms “link”, “connect” or “fix” are to be construed in a broad sense, for example, as fixedly connected, detachably connected, or integrated; mechanically connected or electrically connected; directly connected to each other or indirectly connected to each other via an intermediary; or internally connected between two elements or interacted between two elements. Meanings of the preceding terms in the present application may be understood according to situations by an ordinary person in the art.

In the present application, unless otherwise specified and limited, when a first feature is described as “on” or “below” a second feature, the first feature and the second feature may be in direct contact, or be in contact via another feature between the two features instead of being in direct contact. Moreover, when the first feature is described as “on”, “above” or “over” the second feature, the first feature is right on, above or over the second feature or the first feature is obliquely on, above or over the second feature, or the first feature is simply at a higher level than the second feature. When the first feature is described as “under”, “below” or “underneath” the second feature, the first feature is right under, below or underneath the second feature, or the first feature is obliquely under, below or underneath the second feature, or the first feature is simply at a lower level than the second feature.

In the description of this embodiment, the terms “upper”, “lower”, “left”, “right” and other orientations or positional relationships are based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and for simplification of operations. It does not indicate or imply that the referenced device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present disclosure. In addition, the terms “first” and “second” are used to distinguish in description.

As shown inFIG.1, a battery is provided in the embodiments. The battery may mainly refer to a big cylindrical battery. The battery includes a current collecting plate100, a battery cell200, and a housing300. The current collecting plate100and the battery cell200both are disposed in the housing300. The current collecting plate100may mainly refer to a negative current collecting plate. The current collecting plate100is attached to a lower end face of the battery cell200and configured to electrically connect to a negative electrode tab on the lower end face of the battery cell200and the housing300.

Furthermore, as shown inFIG.1, the battery provided by the embodiments further includes an explosion-proof sheet400. The explosion-proof sheet400covers on a side of the current collecting plate100away from the battery cell200and seal an opening of the housing300. When pressure inside the housing300becomes too large, the explosion-proof sheet400is damaged to relieve the pressure, thus avoiding danger of battery explosion.

However, during the manufacturing processes of the battery, especially in encapsulating of the battery, a pressure is applied to encapsulating positions, which may press the current collecting plate100and force the current collecting plate100to press the battery cell200. With the fragility of the battery cell200, it is easy for the current collecting plate100to press and damage the battery cell200, thus reducing yield rate.

As shown inFIG.2toFIG.5, the current collecting plate100provided by the embodiments includes an electrode tab connector1attached to the lower end face of the battery cell200. The electrode tab connector1is configured to electrically connect to a negative electrode tab disposed on the lower end face of the battery cell200. A plurality of battery cell escaping slots11are defined on an outer peripheral wall of the electrode tab connector1, wherein the plurality of battery cell escaping slots11are spaced from each other. An electrode tab protruding end12is provided between adjacent two battery cell escaping slots11, and an isolation space is defined between the electrode tab protruding end12and the battery cell200, thereby reducing a bonding area between the outer peripheral wall of the electrode tab connector1and the battery cell200. When encapsulating the battery, the electrode tab connector1is prevented from pressing and damaging the battery cell200due to the pressure at the encapsulating positions, thereby improving yield rate.

Exemplarily, as shown inFIG.4, a chamfer121is provided on a corner of the electrode tab protruding end12, and the chamfer121is deburred. The appearance of the electrode tab connector1is improved in entire, and it prevents a sharp part of the electrode tab connector1from injuring operators.

In the embodiments, as shown inFIG.1toFIG.3, an annular slot210is provided on the outer peripheral wall of the battery cell200to define the isolation space between the electrode tab protruding end12and the battery cell200, thereby preventing the electrode tab connector1from damaging the battery cell200.

Exemplarily, as shown inFIG.4, the electrode tab connector1is recessed towards a direction away from the battery cell200to form a reinforcing protrusion13. By providing the reinforcing protrusion13, structure strength of the current collecting plate100is improved, and the reinforcing protrusion13can be used as a welding boundary during laser welding with the current collecting plate100.

Exemplarily, the reinforcing protrusion13is arc-shaped. A plurality of reinforcing protrusions13are provided, and the reinforcing protrusions13are spaced from each other along a peripheral direction of the electrode tab connector1. In the embodiments, three reinforcing protrusions are provided. In other embodiments, the number of the reinforcing protrusions13may be determined based on needs. The number of the reinforcing protrusions13may be two, four, or more.

Exemplarily, as shown inFIG.4, an escaping hole14is defined at a center of the electrode tab connector1. The reinforcing protrusions13are spaced from each other along a peripheral direction of the escaping hole14. The escaping hole14rightly aligns to a via through a middle of the battery cell200to facilitate a wielding tool to wield devices onto a top of the battery after penetrating the escaping hole14and the via in the battery cell200.

Moreover, as shown inFIGS.2to5, the current collecting plate100further includes a housing connector2connected to the electrode tab connector1and configured to electrically connect to the housing300, wherein the housing connector2provided on a side of each of the battery cell escaping slots11away from the battery cell200and directly faces the battery cell escaping slots11. It should be noted that, in the embodiments, three battery cell escaping slots11are provided. Correspondingly, three housing connectors2are provided. The housing connectors2and the electrode tab protruding ends12are staggered along the periphery direction of the electrode tab connector1. In other embodiments, the number of the battery cell escaping slots11and the number of the housing connectors2may be determined as required.

Exemplarily, the outer peripheral wall of the electrode tab connector1is stamped and bent towards a direction away from the battery cell200to form the housing connector2, and the battery cell escaping slots11is provided on a side of the housing connector2towards the battery cell200. It is easy to manufacture the current collecting plate100, the current collecting plate100is integrally formed, and structure strength of the current collecting plate100can be improved.

Exemplarily, as shown inFIG.4, a height of the reinforcing protrusion13in a direction away from the battery cell200is lower than a height of the housing connector2in a direction away from the battery cell200. It avoids abutting of the reinforcing protrusion13against the explosion-proof sheet400when sealing the housing300with the explosion-proof sheet400, and avoids damages to the explosion-proof sheet400caused by the abutting, thereby guaranteeing explosion accuracy of the explosion-proof sheet400.

Exemplarily, as shown inFIG.5, a buffer corrugation21is provided on the housing connector2. As such, the stability of the housing connector2is ensured, and the housing connector2has elasticity of a certain extend for buffering. After the housing connector2of the current collecting plate100is welded to the housing300, the buffer corrugation21can effectively absorb pressure during the encapsulating of the battery, thereby reducing pressure to the current collecting plate100from the housing300, reducing pressure to the battery cell200from the current collecting plate100, and improving the safety of the battery.

According to the battery provided by the embodiments, the current collecting plate100is applied. When encapsulating the battery, the electrode tab connector1is prevented from pressing and damaging the battery cell200due to the pressure at the encapsulating positions, thereby improving yield rate.

A battery module is further provided by the embodiments, and the battery is applied. When encapsulating the battery, the electrode tab connector1is prevented from pressing and damaging the battery cell200due to the pressure at the encapsulating positions, thereby improving yield rate.

A battery pack is further provided by the embodiments, and the battery pack includes at least one battery module. When encapsulating the battery, the electrode tab connector1is prevented from pressing and damaging the battery cell200due to the pressure at the encapsulating positions, thereby improving yield rate.