Patent Description:
In related art, restricted by machining technologies, tabs need to meet certain lengths in a process of manufacturing a secondary battery. The tabs with longer lengths will be folded into a certain space by a tab folding process. When the secondary battery packaged is used, it may be possibly bumped and impacted duo to a usage environment, resulting in an extrusion deformation of some tabs and breaking away from original positions. The tabs are reversely inserted into a battery cell to contact with pole pieces with opposite polarities, resulting in an internal short circuit. After the internal short circuit occurs, the battery is easy to smoke, catch fire, and even explode, resulting in a safety problem. For example, the document <CIT> discloses a relevant insulating pallet disposed between a cell body and tab bodies in a battery cell and has an insulation member made of a soft material deformed adaptively pressed against it.

An object of the present application is to prevent a contact between a positive pole tab and a negative pole tab of a battery cell, and prevent the positive pole tab and the negative pole tab from being reversely inserted into the battery cell.

Another object of the present application is to provide a top cover assembly stably and electrically connected with the battery cell, so as to prevent the contact between the positive pole tab and the negative pole tab of the battery cell.

Another object of the present application is to provide a battery having good quality and a high safety factor.

In order to achieve above purposes, the present application adopts following technical solutions:
In a first aspect, a tab limiting sheet is provided in the embodiment, the tab limiting sheet is insulated and disposed between a cell body and two tab bodies of a battery cell, wherein the two tab bodies are arranged at intervals along a first direction, including:.

Beneficial effects of the present application are that: when the battery cell is deformed and the two tab bodies are close to each other, the two tab bodies will squeeze the first mounting part and the second mounting part. An acting force received by the first mounting part and the second mounting part is transmitted to the elastic element. The elastic element produces a corresponding deformation under pressure to absorb part of a deformation caused by a position movement of the two tab bodies. When the battery cell is continuously deformed and the two tab bodies are continuously close to each other, the first supporting part and the second supporting part are also close to each other. When a distance between the two tab bodies is close to a safe distance, the first supporting part is tightly abutted against the second supporting part to limit the two tab bodies to be further close to each other, thereby preventing the short circuit inside the battery caused by the contact between the two tab bodies. An arrangement of the tab limiting sheet not only prevents the two tab bodies from being contacted, but also prevents a single tab body from being inversely inserted into the cell body.

The present application will now be described in further detail with reference to accompanying drawings and embodiments.

<NUM>, limiting group; <NUM>, tab limiting sheet; <NUM>, first mounting part; <NUM>, first side surface; <NUM>, first mounting groove; <NUM>, connecting assembly; <NUM>, elastic element; <NUM>, first arm body; <NUM>, second arm body; <NUM>, elastic part; <NUM>, first support element; <NUM>, first supporting part; <NUM>, second supporting part; <NUM>, second support element; <NUM>, third supporting part; <NUM>, fourth supporting part; <NUM>, first reinforcing arm; <NUM>, second reinforcing arm; <NUM>, second mounting part; <NUM>, second side surface; <NUM>, second mounting groove; <NUM>, tab body; <NUM>, first connecting part; <NUM>, bending part; <NUM>, second connecting part; <NUM>, top cover assembly; <NUM>, connecting sheet; <NUM>, pole post; <NUM>, cell body.

In order to make a technical problem solved, technical solutions adopted, and technical effects achieved by the present application clearer, the technical solutions of embodiments of the present application will be further described in detail with reference to accompanying drawings. Apparently, the described embodiments are merely a part of the embodiments of the present application, not all the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present application belong to a protecting scope of the present application.

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 with each other or indirectly connected with 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.

As shown in <FIG>, and <FIG>, a tab limiting sheet <NUM> provided by the present application is configured to be insulated and disposed between a cell body <NUM> and two tab bodies <NUM> of a battery cell. The two tab bodies <NUM> are disposed on the battery cell. One of the two tab bodies <NUM> is connected with a positive pole of the cell body <NUM>, and another one of the two tab bodies <NUM> is connected with a negative pole of the cell body <NUM>. The two tab bodies <NUM> on the battery cell are arranged at intervals along a first direction. The first direction is an X-direction shown in the figures. The tab limiting sheet <NUM> includes a first mounting part <NUM>, a connecting assembly <NUM>, and a second mounting part <NUM>, which are sequentially connected along the first direction. The first mounting part <NUM> and the second mounting part <NUM> are respectively configured to abut against the two tab bodies <NUM> tightly. The connecting assembly <NUM> includes an elastic element <NUM> and a first support element <NUM>. The elastic element <NUM> are connected between the first mounting part <NUM> and the second mounting part <NUM>. The first support element <NUM> includes a first supporting part <NUM> and a second supporting part <NUM>, which are independent of each other. The first supporting part <NUM> is connected with the first mounting part <NUM>, and the second supporting part <NUM> is connected with the second mounting part <NUM>. When the elastic element <NUM> is in a natural state, the first supporting part <NUM> and the second supporting part <NUM> are spaced in the first direction. When the elastic element <NUM> is squeezed to a maximum deformation state, the first supporting part <NUM> is tightly abutted against the second supporting part <NUM>. When the battery cell is deformed and the two tab bodies <NUM> are close to each other, the two tab bodies <NUM> will squeeze the first mounting part <NUM> and the second mounting part <NUM>. An acting force received by the first mounting part <NUM> and the second mounting part <NUM> is transmitted to the elastic element <NUM>. The elastic element <NUM> produces a corresponding deformation under pressure to absorb part of a deformation caused by a position movement of the two tab bodies <NUM>. When the battery cell is continuously deformed and the two tab bodies <NUM> are continuously close to each other, the first supporting part <NUM> and the second supporting part <NUM> are also close to each other. When a distance between the two tab bodies <NUM> is close to a safe distance, the first supporting part <NUM> is tightly abutted against the second supporting part <NUM> to limit the two tab bodies <NUM> to be further close to each other, thereby preventing a short circuit inside the battery caused by a contact between the two tab bodies <NUM>.

Referring to <FIG>, in this embodiment, the tab body <NUM> includes a first connecting part <NUM>, a bending part <NUM>, and a second connecting part <NUM>, which are connected at an included angle sequentially. The first connecting part <NUM> is connected with the cell body <NUM>. A spacing area is provided between the second connecting part <NUM> and the cell body <NUM>. The tab limiting sheet <NUM> is disposed in the spacing area. The first mounting part <NUM> and the second mounting part <NUM> of the tab limiting sheet <NUM> are respectively opposite to the bending parts <NUM> of the two tab bodies <NUM>. An arrangement of the tab limiting sheet <NUM> not only prevents the two second connecting parts <NUM> of the two tab bodies <NUM> from contacting, but also prevents the first connecting part <NUM>, the bending part <NUM>, and the second connecting part <NUM> of the tab body <NUM> from being reversely inserted into the cell body <NUM>. Certainly, the tab limiting sheet <NUM> is made of an insulating material. A length of the tab body <NUM> is related to a size (especially a thickness) of the cell body <NUM>. In this embodiment, the length of the tab body <NUM> ranges from <NUM> to <NUM>. A length of the second connecting part <NUM> does not exceed <NUM>/<NUM> of the thickness of the cell body <NUM>.

Referring to <FIG>, specifically, the connecting assembly <NUM> includes two elastic elements <NUM>. The first support element <NUM> is located between two adjacent elastic elements <NUM>. By disposing the first support element <NUM> located between the two adjacent elastic elements <NUM>, a force of the tab limiting sheet <NUM> may be balanced to prevent the elastic elements <NUM> from being concentrated on one side of the tab limiting sheet <NUM>, which ensures that when the first supporting part <NUM> and the second supporting part <NUM> are tightly abutted, the elastic elements <NUM> may not be further deformed, thereby preventing a contract between the two tab bodies <NUM>.

Furthermore, the elastic element <NUM> includes a first arm body <NUM>, an elastic part <NUM>, and a second arm body <NUM>. The elastic part <NUM> is connected between the first arm body <NUM> and the second arm body <NUM>. The first arm body <NUM> is located at a side of the elastic part <NUM> adjacent to the first mounting part <NUM>. By disposing the first arm body <NUM>, the elastic part <NUM>, and the second arm body <NUM>, the deformation and an elasticity of the elastic element <NUM> may be controlled by adjusting a shape and a type of the elastic element <NUM>, so that the first mounting part <NUM> and the second mounting part <NUM> may provide an appropriate acting force for the two tab bodies <NUM> of the battery cell, thereby preventing the contract between the two tab bodies <NUM>, and further preventing the tab bodies <NUM> from being torn and broken.

Referring to <FIG>, in this embodiment, the first arm body <NUM> and the second arm body <NUM> form an included angle. A distance from an end of the first arm body <NUM> adjacent to the first mounting part <NUM> to the first supporting part <NUM> is defined as L1, a distance from an end of the first arm body <NUM> away from the first mounting part <NUM> to the first supporting part <NUM> is defined as L2, and L2 is greater than L1. A distance from an end of the second arm body <NUM> adjacent to the second mounting part <NUM> to the first supporting part <NUM> is defined as L3, a distance from an end of the second arm body <NUM> away from the second mounting part <NUM> to the first supporting part <NUM> is defined as L4, and L4 is grester than L3. At the same time, both the first arm body <NUM> and the second arm body <NUM> extend towards a direction away from the first supporting element <NUM>. When the elastic element <NUM> is squeezed, the elastic part <NUM> may be bent and extended outwards. At the same time, a movement of the elastic part <NUM> may not result in positional interference between the first supporting part <NUM> and the second supporting part <NUM>, which ensures that the first supporting part <NUM> and the second supporting part <NUM> may be tightly abutted. When the elastic part <NUM> is bent and extended outwards, there is a resilient force which may reversely support the tab bodies <NUM>, so that the tab bodies <NUM> are tensioned, and redundant parts of the tab bodies <NUM> are prevented from contacting with the cell body <NUM> of the battery cell to cause the short circuit of the battery.

In this embodiment, ends of the first arm bodies <NUM> of the two elastic elements <NUM> adjacent to the first mounting part <NUM> are connected with an end of the first supporting part <NUM> to form a first common end connected with the first mounting part <NUM>. Ends of the second arm bodies <NUM> of two elastic elements <NUM> adjacent to the second mounting part <NUM> are connected with an end of the second supporting part <NUM> to form a second common end connected with the second mounting part <NUM>. By disposing the first common end and the second common end, the ends of the two elastic elements <NUM> and the ends of the first supporting element <NUM> are connected. When the elastic elements <NUM> or the first support member <NUM> is squeezed, the first common end and the second common end may disperse a force of end areas of the elastic elements <NUM> and the first support element <NUM>, and maintain a connection strength between the elastic elements <NUM> and the first support element <NUM> and the first mounting part <NUM> and the second mounting part <NUM>, thereby preventing the ends of the elastic elements <NUM> and the ends of the first support element <NUM> from being broken.

Specifically, a cross-sectional size of the elastic part <NUM> is less than both a cross-sectional size of the first arm body <NUM> and a cross-sectional size of the second arm body <NUM>. In this embodiment, the tab limiting sheet <NUM> is integrally formed. That is, a material of the elastic part <NUM>, a material of the first arm body <NUM>, and a material of the second arm body <NUM> are same. Therefore, a deformability of the elastic part <NUM> may be increased by decreasing the cross-sectional size of the elastic part <NUM> to reduce a strength of the elastic part <NUM>, so that the elastic element <NUM> may absorb a part of the deformation of the tab bodies <NUM>. Certainly, in other embodiments, the tab limiting sheet <NUM> may be formed by splicing. In this case, a shape of the elastic part <NUM> is not limited to shapes provided by the embodiment. The elastic part <NUM> may be independently made of a material with good elastic performance.

Referring to <FIG>, In an embodiment, the first arm body <NUM> and the second arm body <NUM> are in an arc shape, and the two elastic elements <NUM> in the connecting assembly <NUM> are combined to form a circle shape or an ellipse shape. Referring to <FIG>, in another embodiment, the first arm body <NUM> and the second arm body <NUM> are in a straight-line shape, and the two elastic elements <NUM> in the connecting assembly <NUM> are combined to form a diamond shape. Certainly, the first arm body <NUM> and the second arm body <NUM> may also be in a wavy shape or other irregular patterns, and a pattern formed by a combination of the two elastic elements <NUM> in the connecting assembly <NUM> further correspondingly changes. The shapes of the first arm body <NUM> and the second arm body <NUM> may affect an elasticity of the first arm body <NUM> and the second arm body <NUM>. For example, the elasticity of the first arm body <NUM> and second arm body <NUM> in the arc shape is greater than the elasticity of the first arm body <NUM> and second arm body <NUM> in the straight-line shape. Therefore, the shapes of the first arm body <NUM> and the second arm body <NUM> may be designed according to actual needs. Since the first arm body <NUM> and the second arm body <NUM> have the elasticity, when the tab bodies <NUM> squeeze the tab limiting sheet <NUM>, the first arm body <NUM> and the second arm body <NUM> have a resilience force to support the tab bodies <NUM>, so that the tab bodies <NUM> are tensioned, thereby preventing the second connecting parts <NUM> of the tab bodies <NUM> from being reversely inserted into the cell body <NUM> to cause the short circuit of the battery.

The shape of the first arm body <NUM> and the shape of the second arm body <NUM> may be same, and the size of the first arm body <NUM> and the size of the second arm body <NUM> may further be same, which ensures that a deformation of the first arm body <NUM> and a deformation of the second arm body <NUM> are same, thereby preventing the tab limiting sheet <NUM> from being bent due to an overlarge local deformation.

Specifically, the tab limiting sheet <NUM> includes one or more limiting groups <NUM> spaced in the first direction. Each of the limiting group <NUM> includes one or more connecting assemblies <NUM> arranged in the first direction. The limiting group <NUM> in <FIG> and <FIG> includes two connecting assemblies <NUM>. The limiting group <NUM> in <FIG> includes one connection assembly <NUM>. A first reinforcing arm <NUM> is connected between the two adjacent connecting assemblies <NUM> in one limiting group <NUM>. <FIG> are both provided with two limiting groups <NUM>. All the limiting groups <NUM> are arranged at intervals along a second direction. The second direction is perpendicular to the first direction, and the second direction is a width direction of the tab bodies <NUM>. By disposing the limiting groups <NUM> arranged at intervals along the second direction, there are a plurality of dispersed force points between the connecting assemblies <NUM> and the first mounting part <NUM> and between the connection assemblies <NUM> and the second mounting part <NUM>, so that the tab limiting sheet <NUM> may uniformly support the tab bodies <NUM>, and a possibility that the tab bodes <NUM> is torn is reduced. When a size of the battery is larger, a plurality of connection assemblies <NUM> in each of the limit groups <NUM> may be increased. In this embodiment, a size of the first reinforcing arm <NUM> may be adjusted according to actual needs. Referring to <FIG>, in this embodiment, the quantity of the connecting assemblies <NUM> in each of the limiting groups <NUM> is N. A distance between the first supporting part <NUM> and the second supporting part <NUM> is Z. A maximum deformation of the tab limiting sheet <NUM> is N*Z. Wherein the N*Z ranges from <NUM> to <NUM>. A value of the N*Z is less than <NUM>, so that the tab bodies <NUM> are propped out to contact with an aluminum shell to cause the short circuit. The value of the N*Z is greater than <NUM>, so that a probability that the second connecting part <NUM> of the tab bodies <NUM> is inversely inserted into the cell body <NUM> is improved.

Specifically, the tab limiting sheet <NUM> includes a second reinforcing arm <NUM> connected between two first reinforcing arms <NUM> in two adjacent limiting groups <NUM>. By disposing the second reinforcing arm <NUM>, the connecting assemblies <NUM> in the two adjacent limiting groups <NUM> may be connected, so that a strength of the tab limiting sheet <NUM> may be ensured, a force of the connecting assemblies <NUM> is balanced, and the tab limiting sheet <NUM> is prevented from being bent due to an overlarge deformation of the single connecting assembly <NUM>.

Referring to <FIG>, In an embodiment, a second support element <NUM> is further disposed between the two adjacent limiting groups <NUM>. The second support element <NUM> includes a third supporting part <NUM> and a fourth supporting part <NUM>, which are independent with each other. The third supporting part <NUM> is connected with the first mounting part <NUM>, and the fourth supporting part <NUM> is connected with the second mounting part <NUM>. When the elastic element <NUM> is in the natural state, the third supporting part <NUM> and the fourth supporting part <NUM> are spaced in the first direction. When the elastic element <NUM> is squeezed to the maximum deformation state, the third supporting part <NUM> is tightly abutted against the fourth supporting part <NUM>. At the same time, one first support element <NUM> or one second support element <NUM> is disposed between the adjacent two elastic elements <NUM>. When the elastic element <NUM> is squeezed to the maximum deformation state, the third supporting part <NUM> and the fourth supporting part <NUM> are tightly abutted, and the third supporting part <NUM> and the fourth supporting part <NUM> are tightly abutted. Therefore, both sides of the elastic element <NUM> have a supporting force, so that the two sides of the elastic element <NUM> are balanced in force, thereby preventing the elastic element <NUM> from being continuously deformed after being pressed. In this embodiment, in the natural state, the distance between the first supporting part <NUM> and the second supporting part <NUM> is Z, and a distance between the third supporting part <NUM> and the fourth supporting part <NUM> is also Z.

Continue to refer to <FIG>, the quantity of the connecting assemblies <NUM> in each of the limiting groups <NUM> is defined as N, and N is greater than <NUM>. A second reinforcing arm <NUM> is connected between the first reinforcing arms <NUM> in the two adjacent limiting groups. A quantity of second support elements <NUM> are disposed along the first direction. Along the first direction, the second reinforcing arm <NUM> is connected with the third supporting part <NUM> and the fourth supporting part <NUM> on two adjacent second supporting parts <NUM>. By disposing the third supporting part <NUM> and the fourth supporting part <NUM> on the second reinforcing arm <NUM>, a structure of the tab limiting sheet <NUM> may be simplified, a manufacturing difficulty of the tab limiting sheet <NUM> may be decreased, and a strength of the third supporting part <NUM> and the fourth supporting part <NUM> may further be ensured, thereby the second supporting part <NUM> may provide a strength support for the tab bodies <NUM>.

Referring to <FIG>, furthermore, the first mounting part <NUM> is provided with a first side surface <NUM> away from the second mounting part <NUM>. The first side surface <NUM> is recessed to define a first mounting groove <NUM> configured to mount the tab bodies <NUM>. The second mounting part <NUM> is provided with a second side surface <NUM> away from the first mounting part <NUM>. The second side surface <NUM> is recessed to define a second mounting groove <NUM> configured to mount the tab bodies <NUM>. By providing the first mounting groove <NUM> and the second mounting groove <NUM>, the two tab bodies <NUM> may be respectively mounted in the first mounting groove <NUM> and the second mounting groove <NUM>. Groove walls of the first mounting groove <NUM> and the second mounting groove <NUM> may limit the tab bodies <NUM>, so as to prevent the tab bodies <NUM> from being separated from the tab limiting sheet <NUM>.

In this embodiment, the tab body <NUM> has a plurality of layers. The quantity of the layers of the tab body <NUM> ranges from <NUM> to <NUM>. The multi-layer tab body <NUM> has a certain thickness, so that the groove walls of the first mounting groove <NUM> and the second mounting groove <NUM> may respectively limit and clamp the tab bodies <NUM>, thereby preventing the tab limiting sheet <NUM> from sliding left and right in a process of assembling the battery.

In an embodiment, a transition arc surface is provided between the groove wall of the first mounting groove <NUM> and the first side surface <NUM>, and a transition arc surface is further provided between the groove wall of the second mounting groove <NUM> and the second side surface <NUM>, which may prevent a sharp angle structure from scratching the tab bodies <NUM>.

Specifically, the bending parts <NUM> of the two tab bodies <NUM> are respectively attached to bottoms of the first mounting groove <NUM> and the second mounting groove <NUM>. The second connecting parts <NUM> of the two tab bodies <NUM> are respectively located on upper surfaces of the first mounting part <NUM> and the second mounting part <NUM>. When the battery is assembled, for example, when the cell is folded, the two tab bodies <NUM> may move inwards and compress the first mounting part <NUM> and the second mounting part <NUM> to exert inward forces on the mounting parts. Meanwhile, the forces exerted on the first mounting part <NUM> and the second mounting part <NUM> are respectively transmitted to the first arm body <NUM> and the second arm body <NUM>. When the first arm body <NUM> and the second arm body <NUM> are subjected to compressive forces, the elastic part <NUM> will be bent and extended outwards, and the elastic part <NUM> generates a corresponding elastic deformation for cushioning the forces, so that the first arm body <NUM> and the second arm body <NUM> will not be broken due to the excessive forces.

While the elastic part <NUM> is bent outward, the first supporting part <NUM> and the second supporting part <NUM> (the third supporting part <NUM> and the fourth supporting part <NUM>) gradually approach each other. When the first supporting part <NUM> and the second supporting part <NUM> (the third supporting part <NUM> and the fourth supporting part <NUM>) are in contact, the tab bodies <NUM> on both sides of the tab limiting sheet <NUM> stop getting close inwards. There is no gap between the first supporting part <NUM> and the second supporting part <NUM> (the third supporting part <NUM> and the fourth supporting part <NUM>), the first mounting portion <NUM> and the second mounting portion <NUM> are reversely acted on the tab bodies <NUM> by the compression force of the tab bodies <NUM> to support the tab bodies <NUM>.

The first mounting part <NUM>, the second mounting part <NUM>, the first arm body <NUM>, the elastic part <NUM>, the second arm body <NUM>, the first supporting part <NUM>, the second supporting part <NUM> and the like enable the tab limiting sheet <NUM> to be hollowed out. In this way, material cost may be reduced, and a self-weight of the tab limiting sheet <NUM> is reduced. Under a condition that a weight of the secondary battery is constant, a weight of an active material on the tab bodies <NUM> is increased by reducing the weight of the tab limiting sheet <NUM>, thereby increasing an energy density of the battery.

In this embodiment, a distance from the bottom of the first mounting groove <NUM> to the bottom of the second mounting groove <NUM> is D, a distance between the two tab bodies <NUM> is defined as X1, and a thickness of the cell body <NUM> is defined as X2, wherein X1 is less than D, and D is less than X2. If D is greater than X2, the tab bodies <NUM> are propped out to contact with an aluminum shell, resulting in the short circuit. If D is less than X1, the supporting force of the tab bodies <NUM> is insufficient, so that the tab bodies <NUM> may not be completely flattened, and a risk that the tab bodies <NUM> are reversely inserted is not reduced.

The embodiments further provide a top cover assembly <NUM>. As shown in <FIG>, the top cover assembly <NUM> includes a top cover, a pole post <NUM>, and the tab limiting sheet <NUM> in any embodiment mentioned above. The pole post <NUM> is disposed on the top cover and connected with the tab bodies <NUM> of the battery cell. The arrangement of the tab limiting sheet <NUM> may prevent the contract between the second connecting parts <NUM> of the two tab bodies <NUM>, and may prevent the first connecting part <NUM>, the bending part <NUM>, and the second connecting part <NUM> of the tab bodies <NUM> from being inversely inserted into the cell body <NUM>. Therefore, the arrangement of the tab limiting sheet <NUM> may ensure a connection stability of the second connecting part <NUM> and the pole post <NUM>, and may prevent the short circuit between the positive pole and the negative pole of the battery cell caused to the short circuit of the battery.

In an embodiment, the top cover assembly <NUM> further includes a connecting sheet <NUM>. The second connecting part <NUM> of the tab bodies <NUM> is connected with the pole column <NUM> through the connecting sheet <NUM>, so that the length of the second connecting part <NUM> may be shortened, a possibility that the two second connecting parts <NUM> are contacted is reduced, and the probability that the second connecting part <NUM> is inversely inserted into the cell body <NUM> is further reduced.

In other embodiments, the top cover assembly <NUM> may not be provided with the connecting sheet <NUM>. At this time, the tab bodies <NUM> are directly connected to the pole column <NUM>. Since no connecting sheet <NUM> is provided, the tab body <NUM> with longer length are required to meet a connection condition. Illustratively, the length of the tab body <NUM> ranges from <NUM> to <NUM>. Since the length of the tab body <NUM> in the battery without the connecting sheet <NUM> is longer, the tab bodies <NUM> are easier to be reversely inserted into the cell body <NUM> due to external influence. Therefore, a probability that the tab bodies <NUM> are reversely inserted into the cell body <NUM> may be greatly reduced due to the arrangement of the tab limiting sheet <NUM>, thereby preventing the internal short circuit of the battery. Certainly, no matter whether the top cover assembly <NUM> includes the connecting sheet <NUM> or not, the tab limiting sheet <NUM> may be arranged to limit and fix the tab bodies <NUM>.

The embodiments further provide a battery. As shown in <FIG> and <FIG>, the battery includes a battery cell and the top cover assembly <NUM> in the embodiments mentioned above. The battery cell includes a cell body <NUM> and the two tab bodies <NUM>. A first connecting part <NUM> of the tab bodies <NUM> is connected to the cell body <NUM>. The spacing area is formed between the second connecting part <NUM> and the cell body <NUM>. The tab limiting sheet <NUM> of the top cover assembly <NUM> is arranged in the spacing area. The first mounting part <NUM> and the second mounting part <NUM> of the tab limiting sheet <NUM> are respectively opposite to the bending parts <NUM> of the two tab bodies <NUM>. The arrangement of the tab limiting sheet <NUM> may ensure that the two tab bodies <NUM> are spaced, and may further ensure that the second connecting part <NUM> of the tab bodies <NUM> and the cell body <NUM> are spaced. Therefore, a probability of the short circuit in the battery provided with the tab limiting sheet <NUM> is low. Even if the battery cell is expanded, bumped and the like, the tab body <NUM> of the positive pole may not be connected with the tab body <NUM> of the negative pole to cause the short circuit, thereby improving a safety coefficient of the battery.

In description of the embodiment, it should be understood that orientational or positional relationships represented by directional terms mentioned in the present application, such as up, down, left, right, etc., are orientational or positional relationships based on the drawings, and are merely for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element is intended to have a particular orientation, or is constructed and operated in a particular orientation, and therefore, should not be interpreted as a limitation of the present application. In addition, the terms "first" and "second" are only used to distinguish between the descriptions, and have no special meaning.

In the description of this specification, descriptions of the reference terms "an embodiment", "example", etc. mean that specific features, structures, materials, or features described in connection with the embodiments or examples are included in at least one embodiment or example of the present application. In this specification, schematic expressions of the above terms do not necessarily refer to the same embodiments or examples.

In addition, it should be understood that although the specification is described in accordance with embodiments, not each embodiment contains only an independent technical solution, the description is set forth in such a manner as to be clear only, and the specification should be taken as a whole by those skilled in the art, and the technical solutions in the various embodiments may be suitably combined to form other embodiments that will be understood by those skilled in the art.

Claim 1:
A tab limiting sheet (<NUM>), insulated and disposed between a cell body (<NUM>) and two tab bodies (<NUM>) of a battery cell arranged at intervals along a first direction, characterized in that the tab limiting sheet (<NUM>) comprises:
a first mounting part (<NUM>) and a second mounting part (<NUM>) respectively to abut against the two tab bodies (<NUM>) tightly; and
a connecting assembly (<NUM>), wherein the first mounting part (<NUM>), the connecting assembly (<NUM>), and the second mounting part (<NUM>) are sequentially connected along the first direction, and the connecting assembly (<NUM>) comprises:
an elastic element (<NUM>), connected between the first mounting part (<NUM>) and the second mounting part (<NUM>); and
a first support element (<NUM>), comprising a first supporting part (<NUM>) connected with the first mounting part (<NUM>) and a second supporting part (<NUM>) connected with the second mounting part (<NUM>);
wherein when the elastic element (<NUM>) is in a natural state, the first supporting part (<NUM>) and the second supporting part (<NUM>) are spaced in the first direction, and when the elastic element (<NUM>) is squeezed to a maximum deformation state, the first supporting part (<NUM>) is tightly abutted against the second supporting part (<NUM>).