Single battery and application thereof

Abstract

The invention provides a single battery and application thereof. The single battery comprises a battery cell, a current collecting component and a shell, a tab extends out of at least one end surface of the battery cell; the current collecting component is arranged on the surface of the tab and is electrically connected with the tab; an accommodating space is formed in the shell and is used for accommodating the battery cell and the current collecting component; a gap exists between at least part of the edge area of the current collecting component and the shell, the gap is filled with a tab, and the current collecting component is electrically connected with the shell through the tab filled in the gap. According to the single battery structure designed by the invention, the tab can be filled into the gap between the current collecting component and the shell, and the current collecting component can be connected with the shell by taking the tab as a medium, so that the single battery structure is scratch-resistant and high in shell-entering compatibility, and the problems of explosion points, overcurrent and the like caused by the concentricity problem of the current collecting component can be effectively avoided; short circuit in the battery is prevented, and the over-current capability of the battery core and the shell is ensured.

Description

Technical Field

[0001] The invention belongs to the technical field of batteries, and in particular relates to a single cell and application thereof. Background Art

[0002] The current collecting component of the existing cylindrical battery is arranged in such a way that the current collecting component is electrically connected to the tabs and then to the shell. Specifically, the tabs extend from one side of the battery cell and are evenly distributed on the end face of the battery cell. Since there is an assembly gap between the battery cell and the shell, the current collecting component will be slightly larger than the battery cell and can be connected with the shell. However, due to the machining error of the current collecting component, the concentricity of the current collecting component cannot be guaranteed, and the outer diameter size does not match the shell well. There will inevitably be a gap between the edge of the current collecting component and the shell, resulting in a burst point between the edge of the current collecting component and the shell, generating welding slag, and causing internal short circuit problems in the battery. At the same time, the gap between the edge of the current collecting component and the shell will also affect the current carrying capacity of the battery cell and the shell.

[0003] Therefore, it is necessary to provide a single cell to avoid problems such as battery explosion and overcurrent caused by the failure to ensure the concentricity of the current collecting component. Summary of the invention

[0004] In view of the deficiencies in the prior art, the object of the present invention is to provide a single cell and its application, wherein the pole tab of the single cell is filled into the gap between the current collecting component and the shell, so that the current collecting component can be electrically connected to the shell through the pole tab as a medium, thereby preventing problems such as explosion point and overcurrent caused by the gap between the current collecting component and the shell, avoiding short circuit inside the battery, and ensuring the overcurrent capacity of the battery cell and the shell.

[0005] In order to achieve the purpose of the invention, the present invention adopts the following technical solutions:

[0006] The present invention provides a single battery, which comprises a battery core, a current collecting component and a shell;

[0007] A pole ear extends out from at least one end surface of the battery cell;

[0008] The current collecting member is arranged on the surface of the electrode tab and is electrically connected to the electrode tab;

[0009] The housing is provided with a containing space for containing the battery core and the current collecting component;

[0010] There is a gap between at least a portion of the edge region of the current collecting component and the shell, and the gap is filled with a pole lug, and the current collecting component is electrically connected to the shell through the pole lug filled in the gap.

[0011] Preferably, the edge area of ​​the current collecting component includes a first edge area and a second edge area, there is a gap between the first edge area and the shell, and the first edge area is electrically connected to the shell through a pole ear, and the second edge area is in contact with the shell and electrically connected.

[0012] Preferably, an edge region of the current collecting member is bent in a direction away from the battery core to form a bent portion, and the bent portion is electrically connected to the housing.

[0013] Preferably, there is a gap between any edge region of the current collecting member and the shell, the gap is filled with a pole lug, and the current collecting member is electrically connected to the shell via the pole lug filled in the gap.

[0014] Preferably, the battery core is provided with a central hole, and the central hole passes through the battery core;

[0015] The pole lug includes a first pole lug region and a second pole lug region along the radial direction of the central hole, wherein the second pole lug region is located in a direction away from the central hole from the first pole lug region; the first pole lug and / or the second pole lug is electrically connected to the current collecting member.

[0016] Preferably, the tabs in the first tab area are bent toward the end face of the cell away from the center hole and extend into the gap between the current collecting member and the shell, and the current collecting member is electrically connected to the shell through the tabs in the first tab area.

[0017] Preferably, the tabs in the second tab area are bent toward the end face of the cell away from the center hole and extend into the gap between the current collecting member and the shell, and the current collecting member is electrically connected to the shell through the tabs in the second tab area.

[0018] Preferably, at least one notch is provided on the edge of the current collecting member.

[0019] In a second aspect, the present invention provides a battery, comprising the single cell as described in the first aspect.

[0020] In a third aspect, the present invention provides an electrical device, wherein the electrical device comprises the battery as described in the second aspect.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] Due to the machining error of the current collecting component, there will be a gap between the current collecting component and the shell. The present invention fills the pole ear in the gap, and the current collecting component is electrically connected to the shell through the pole ear as a medium, so as to avoid the gap between the shell and the current collecting component due to the concentricity problem of the current collecting component and the shell, causing problems such as explosion point and overcurrent, prevent short circuit inside the battery, ensure overcurrent between the battery cell and the shell, and at the same time, it can also prevent scratches and improve the compatibility with the shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic cross-sectional view of a single cell provided in Example 1 of the present invention.

[0024] Figure 2 This is the overall appearance diagram of the battery cell provided in Example 1 of the present invention.

[0025] Figure 3 This is a schematic structural diagram of the current collecting component provided in Example 1 of the present invention.

[0026] Figure 4 This is a schematic diagram of a battery cell with a current collecting component provided in Example 1 of the present invention.

[0027] Figure 5 This is a partial enlarged view of the battery cell with the current collecting component provided in Example 1 of the present invention.

[0028] Figure 6 This is a schematic structural diagram of the current collecting component provided in Example 2 of the present invention.

[0029] Figure 7 This is a partial enlarged view of a battery cell with a current collecting component provided in Example 2 of the present invention.

[0030] Among them, 1-battery core, 2-shell, 3-current collecting component, 31-first edge area, 32-second edge area, 4-ear, 5-center hole. DETAILED DESCRIPTION

[0031] The technical solution of the present invention is further described below by specific implementation methods. It should be understood by those skilled in the art that the implementation methods are only to help understand the present invention and should not be regarded as specific limitations of the present invention.

[0032] In a first specific embodiment, the present invention provides a single battery, the single battery comprising a battery cell, a current collecting member and a housing;

[0033] A pole ear extends out from at least one end surface of the battery cell;

[0034] The current collecting member is arranged on the surface of the electrode tab and is electrically connected to the electrode tab;

[0035] The housing is provided with a containing space for containing the battery core and the current collecting component;

[0036] There is a gap between at least a portion of the edge region of the current collecting component and the shell, and the gap is filled with a pole lug, and the current collecting component is electrically connected to the shell through the pole lug filled in the gap.

[0037] The shell of the single cell described in the present invention accommodates the battery cell and the current collecting component inside, at least one end face of the battery cell extends out of the pole ear, and the current collecting component is arranged on the surface of the pole ear. Due to the machining error of the current collecting component, there will be a gap between the current collecting component and the shell when the current collecting component is arranged. The present invention fills the pole ear in the gap, and the current collecting component is electrically connected to the shell through the pole ear as a medium, so as to avoid the gap between the shell and the current collecting component due to the concentricity problem of the current collecting component and the shell, thereby avoiding the explosion point and overcurrent caused by the gap between the shell and the current collecting component, preventing short circuit inside the battery, ensuring the overcurrent of the battery cell and the shell, and at the same time, it can also prevent the scratch problem caused by the mismatch between the current collecting component and the shell, thereby improving the compatibility of the current collecting component into the shell.

[0038] Preferably, the edge area of ​​the current collecting component includes a first edge area and a second edge area, there is a gap between the first edge area and the shell, and the first edge area is electrically connected to the shell through a pole ear, and the second edge area is in contact with the shell and electrically connected.

[0039] As mentioned above, due to machining errors, the current collecting component cannot be processed to be completely fitted with the shell, and there may be a partial gap between the two, or the two are not fitted at all, and there is a gap between any edge area of ​​the current collecting component and the shell; when there is a gap between some edge areas of the current collecting component and the shell, the present invention prevents the current collecting component from fitting with the shell. The present invention divides the edge area with the gap into a first edge area, and divides the edge area of ​​the current collecting component that can fit with the shell into a second edge area. At this time, the electrode ear is filled in the gap between the first edge area and the shell, and the first edge area is electrically connected to the shell through the electrode ear to avoid the existence of a gap between the current collecting component and the shell. The second edge area can directly fit with the shell, and therefore can directly contact the shell for electrical connection.

[0040] The present invention preferably has a situation where there is a gap only in part of the edge areas of the current collecting component and the shell, that is, it is preferred that there is a gap between the first edge area of ​​the current collecting component and the shell, the first edge area is electrically connected to the shell through the pole ear, and the second edge area is in contact with the shell. Because in this case the second edge area can directly contact and be electrically connected to the shell, the electrical connection of the single cell is better. At the same time, the pole ear of the present invention is filled in the gap between the first edge area and the shell, which can play the role of embedding and fixing the current collecting component and preventing scratches, thereby further improving the structural strength of the single cell.

[0041] Preferably, an edge region of the current collecting member is bent in a direction away from the battery core to form a bent portion, and the bent portion is electrically connected to the housing.

[0042] The present invention further preferably has the second edge region of the current collecting component bent away from the battery cell to form a bent portion, so that the bent portion fits the shell for electrical connection, thereby improving the tightness of the fit between the current collecting component and the shell and facilitating the electrical connection between the shell and the current collecting component.

[0043] Preferably, the diameter of the bent portion is less than or equal to the inner wall diameter of the shell, so that the current collecting component and the shell are fitted together.

[0044] Preferably, there is a gap between any edge region of the current collecting member and the shell, the gap is filled with a pole lug, and the current collecting member is electrically connected to the shell via the pole lug filled in the gap.

[0045] When the radial dimension of the current collecting component is smaller than the dimension of the shell and cannot fit the shell at all, there will be a gap between any edge area of ​​the current collecting component and the shell. The present invention fills the electrode ear in the gap, which can avoid the existence of a gap between the current collecting component and the shell, avoid scratches between the current collecting component and the shell, and realize electrical connection between the current collecting component and the shell through the electrode ear.

[0046] When the pole ear of the present invention is filled in the gap between any edge area of ​​the current collecting component and the shell, the pole ear is fitted and electrically connected to the shell. The pole ear can also be bent in the same way as the edge area of ​​the current collecting component is bent, so that the edge area of ​​the pole ear is bent in the direction away from the battery cell to form a bent portion, and the bent portion is welded to the shell to achieve electrical connection.

[0047] Preferably, at least one notch is provided on the edge of the current collecting member.

[0048] The edge of the current collecting component of the present invention is provided with a notch, which can make the current collecting component easy to deform, so that it is easier to fit the shell; and, since the current collecting component will generate stress inside during the bending or welding process, the stress concentration will cause the current collecting disk to crack and deform, and the notch is set at the edge of the current collecting component of the present invention, which can release the stress in time and avoid uncontrollable deformation and cracking. It should be noted that the notch here does not belong to the first edge area mentioned above. Although there is a gap between the notch and the shell, the gap here is designed and processed. When the current collecting component and the shell are welded, it can be predicted and avoided, and will not cause problems such as explosion points.

[0049] Preferably, the battery core is provided with a central hole, and the central hole passes through the battery core;

[0050] The pole lug includes a first pole lug region and a second pole lug region along the radial direction of the central hole, wherein the second pole lug region is located in a direction away from the central hole from the first pole lug region; the first pole lug and / or the second pole lug is electrically connected to the current collecting member.

[0051] The battery cell described in the present invention can be exemplarily formed by winding a multi-layer structure of a positive electrode sheet, a separator, a negative electrode sheet, a separator, a positive electrode sheet... and so on. The reel during winding forms the center hole. After each layer of the positive electrode sheet or the negative electrode sheet in the multi-layer structure has a pole ear led out, there are pole ears at different positions of the end face of the battery cell. The present invention sets the pole ear area close to the center hole as the first pole ear area, which is the pole ear led out of the pole sheet close to the center position of the battery cell. The present invention sets the pole ear area away from the center hole as the second pole ear area, which is the pole ear led out of the pole sheet away from the center of the battery cell.

[0052] Preferably, the radius of the first pole lug region is half of the radius of the second pole lug region.

[0053] Preferably, the tabs in the first tab area are bent toward the end face of the cell away from the center hole and extend into the gap between the current collecting member and the shell, and the current collecting member is electrically connected to the shell through the tabs in the first tab area.

[0054] Preferably, the tabs in the second tab area are bent toward the end face of the cell away from the center hole and extend into the gap between the current collecting member and the shell, and the current collecting member is electrically connected to the shell through the tabs in the second tab area.

[0055] The pole lug filled in the gap between the current collecting component and the shell of the present invention can be the pole lug of the first pole lug area or the pole lug of the second pole lug area. When the pole lug length of the first pole lug area is longer and larger than the pole lug of the second pole lug area, its longer length can be utilized. Preferably, the pole lug of the first pole lug area is filled in the gap. Moreover, when the pole lug of the first pole lug area is filled in the gap, since the pole lug of the first pole lug area is close to the central hole of the battery cell, it can cover the pole lug of the second pole lug area when filling the gap, thereby overlapping with the pole lug of the second pole lug area, which is beneficial to the overcurrent of the battery.

[0056] When the length of the pole lug in the second pole lug area is longer, it is preferred that the pole lug in the second pole lug area is filled in the gap, and at this time the pole lug in the second pole lug area is closer to the gap, and the required pole lug length can be shorter, thereby saving pole lug material; in addition, when the pole lug in the second pole lug area is filled in the gap, the pole lug in the first pole lug area and the pole lug in the second pole lug area are electrically connected by overlapping.

[0057] Since the pole ear of the present invention extends out at one end of the battery cell, the present invention achieves filling in the gap by bending the pole ear toward the end face of the battery cell. When bending the pole ear, the prior art usually flattens it from the outside to the inside, that is, flattens it from the gap to the center hole, to avoid overlapping of the pole ear and the shell, while the present invention preferably flattens the pole ear from the inside to the outside, that is, flattens it from the center hole to the shell, thereby ensuring that the pole ear can extend into the gap.

[0058] Exemplarily, the electrical connection method of the present invention includes welding.

[0059] In a second embodiment, the present invention provides a battery, comprising the single cell as described in the first embodiment.

[0060] In a third embodiment, the present invention provides an electrical device, wherein the electrical device comprises the battery as described in the second embodiment.

[0061] The technical solution of the present invention is further illustrated by specific embodiments below.

[0062] Example 1

[0063] The present embodiment provides a single battery, which includes a battery cell 1, a current collecting member 3 and a shell 2. The shell 2 is provided with a containing space for containing the battery cell 1 and the current collecting member 3. The battery cell 1 is cylindrical, and a center hole 5 is provided at the center of the battery cell 1. The center hole 5 penetrates the battery cell 1. The schematic cross-sectional view of the single battery along the penetration direction of the center hole 5 is as shown in FIG. Figure 1 As shown;

[0064] The overall appearance of the battery cell 1 is shown in FIG. Figure 2As shown, at least one end face of the battery cell 1 extends with a pole ear 4, and the pole ear 4 is bent in a direction away from the center hole 5 of the end face of the battery cell 1, and the bending is performed by flattening the pole ear 4 from the direction of the center hole 5 to the direction of the shell 2 to ensure that the pole ear 4 can be filled in the gap;

[0065] The current collecting component 3 is a current collecting disk, and its structural schematic diagram is as follows: Figure 3 As shown, three notches are provided on the edge;

[0066] The schematic cross-sectional view of the battery cell 1 provided with the current collecting member 3 along the direction in which the central hole 5 penetrates is as follows: Figure 4 As shown, a partial enlarged view of a battery cell with a current collecting component is shown in Figure 5 As shown, the current collecting member 3 is arranged on the surface of the pole ear 4, and there is a gap between any edge area of ​​the current collecting member 3 and the shell 2, and the pole ear 4 is filled in the gap, and the current collecting member 3 is electrically connected to the shell 2 through the pole ear 4 filled in the gap; the edge area of ​​the pole ear 4 filled in the gap is bent in a direction away from the battery core 1 to form a bending portion, and the bending portion is welded to the shell 2 to realize the electrical connection between the pole ear 4 and the shell 2;

[0067] The pole lug 4 includes a first pole lug area and a second pole lug area along the radial direction of the center hole 5, the second pole lug area is located in the direction of the first pole lug area away from the center hole 5, and the radius of the first pole lug area is half of the radius of the second pole lug area; when the pole lug 4 in the second pole lug area is bent toward the direction of the end face of the battery cell 1 away from the center hole 5, it extends to the gap between any edge area of ​​the current collecting component 3 and the shell 2, and the pole lug 4 in the first pole lug area and the pole lug 4 in the second pole lug area are electrically connected by overlapping.

[0068] The radial dimension of the current collecting component 3 of this embodiment is smaller than the inner diameter dimension of the shell 2. The current collecting component 3 and the shell 2 are not fitted at all. There is a gap between any edge area of ​​the current collecting component 3 and the shell 2. Figure 4 It can be seen that the tab 4 is filled in the gap between any edge region of the current collecting component 3 and the housing 2 , which can avoid problems such as explosion points and overcurrent caused by the gap.

[0069] In addition, in this embodiment, the pole lug 4 of the second pole lug region is filled in the gap. Since the pole lug 4 of the second pole lug region is closer to the gap, the material of the pole lug 4 can be saved.

[0070] Example 2

[0071] This embodiment provides a single battery, which includes a battery cell 1, a current collecting member 3 and a shell 2, wherein a housing space is provided in the shell 2 for accommodating the battery cell 1 and the current collecting member 3; the battery cell 1 is cylindrical, and a center hole 5 is provided at the center of the battery cell 1, and the center hole 5 passes through the battery cell 1;

[0072] A pole lug 4 extends from at least one end face of the battery cell 1, and the pole lug 4 is bent in a direction away from the center hole 5 at the end face of the battery cell 1;

[0073] The structural schematic diagram of the current collecting component 3 is as follows Figure 6 As shown, the current collecting component 3 is a current collecting plate, and there are 6 notches on the edge, and the edge of the current collecting component 3 other than the notches is bent and warped, and the edge area of ​​the current collecting component 3 includes a first edge area 31 and a second edge area 32, wherein the edge of the notch is the first edge area 31, and the edge bending and warping area other than the notch is the second edge area 32;

[0074] A partial enlarged view of the battery cell 1 provided with the current collecting member 3 is shown in FIG. Figure 7 As shown, the current collecting member 3 is arranged on the surface of the pole ear 4, there is a gap between the first edge area 31 and the shell 2, the pole ear 4 is filled in the gap between the first edge area 31 and the shell 2, so that the first edge area 31 is electrically connected to the shell 2 through the pole ear 4, the second edge area 32 is in contact with the shell 2, and the second edge area 32 is bent and warped in a direction away from the battery cell 1, and the bent portion formed by the bending and warping is in contact with the shell 2 and is electrically connected through welding;

[0075] The pole lug 4 includes a first pole lug area and a second pole lug area along the radial direction of the center hole 5, the second pole lug area is located in the direction of the first pole lug area away from the center hole 5, and the radius of the first pole lug area is half of the radius of the second pole lug area; when the pole lug 4 in the second pole lug area is bent in the direction of the end face of the battery cell 1 away from the center hole 5, it will adaptively extend to the gap between the first edge area 31 and the shell 2, and the pole lug 4 in the first pole lug area and the pole lug 4 in the second pole lug area are electrically connected by overlapping;

[0076] There is a gap between some edge areas of the current collecting component 3 of the present embodiment and the shell 2, and some areas can be directly fitted and contacted with the shell 2. Therefore, the pole ear 4 of the present embodiment is filled in the gap between the first edge area 31 having a gap with the shell 2, so that the first edge area 31 is electrically connected to the shell 2 through the pole ear 4, and the second edge area 32 is directly fitted and contacted with the shell 2 and electrically connected, so that the electrical connection of the single battery is better, and the pole ear 4 can also play a fitting role to improve the structural strength of the single battery.

[0077] In addition, in this embodiment, the pole lug 4 of the second pole lug region is filled in the gap. Since the pole lug 4 of the second pole lug region is closer to the gap, the material of the pole lug 4 can be saved.

[0078] Example 3

[0079] This embodiment provides a single cell battery, which is different from the single cell battery in Embodiment 1 in that: the pole lugs in the first pole lug area are bent in a direction away from the center hole of the end face of the battery cell, and extend to the gap between any edge area of ​​the current collecting component and the shell, and the pole lugs in the first pole lug area cover the pole lugs in the second pole lug area when extending to the gap, so that the pole lugs in the first pole lug area and the pole lugs in the second pole lug area are electrically connected, and the rest are the same as Embodiment 1.

[0080] The difference between the single cell provided in this embodiment and that in Embodiment 1 is that in this embodiment, the pole lugs in the first pole lug area are filled in the gap between any edge area of ​​the current collecting component and the shell. Compared with the situation in Embodiment 1 where the pole lugs in the second pole lug area are filled in the gap, in this embodiment, the pole lugs in the first pole lug area are close to the center hole of the battery cell and can cover the pole lugs in the second pole lug area when filling the gap, thereby overlapping with the pole lugs in the second pole lug area, which is beneficial to the overcurrent of the battery.

[0081] Example 4

[0082] This embodiment provides a single cell battery. The difference between the single cell battery and the embodiment 2 is that the pole lugs in the first pole lug area are bent in the direction away from the center hole of the end face of the battery cell, and extend into the gap between the first edge area of ​​the current collecting component and the shell. When the pole lugs in the first pole lug area extend to the gap, they cover the pole lugs in the second pole lug area, so that the pole lugs in the first pole lug area and the pole lugs in the second pole lug area are electrically connected. The rest are the same as the embodiment 2.

[0083] The difference between the single cell provided in this embodiment and that in Embodiment 2 is that the pole lugs in the first pole lug area are filled in the gap between the first edge region of the current collecting component and the shell. Compared with Embodiment 2, the pole lugs in the first pole lug area can cover the pole lugs in the second pole lug area when the pole lugs in the first pole lug area are filled in the gap, thereby achieving overlap of the pole lugs in the two areas, which is beneficial to the flow of current in the battery.

[0084] Comparative Example 1

[0085] The present comparative example provides a single battery, the single battery comprising a battery cell, a current collecting member and a shell, wherein a housing space is provided in the shell for accommodating the battery cell and the current collecting member; the battery cell is cylindrical, and a center hole is provided at the center of the battery cell, and the center hole penetrates the battery cell;

[0086] A pole ear extends from one end face of the battery cell, and the pole ear is bent in a direction away from the center hole of the battery cell end face, and the bending method is to flatten the pole ear from the direction of the shell to the direction of the center hole to ensure that the pole ear does not contact the shell;

[0087] The current collecting component is a current collecting disk, and a portion of the edge region of the current collecting component can contact the shell to achieve electrical connection through welding, while another portion of the edge region of the current collecting component has a gap with the shell, and the pole ear is not in the gap.

[0088] In this comparative example, since the current collecting component cannot be completely fitted with the shell, there is a gap between the current collecting component and the shell, and the pole ear does not contact the shell and does not exist in the gap. Therefore, there will be a burst point between the current collecting component and the shell, generating welding slag, causing internal short circuit problems in the battery, and affecting the current carrying capacity of the battery cell and the shell. In Examples 1-4 of the present invention, the pole ear is filled in the gap between the current collecting component and the shell, which can avoid a series of problems caused by the gap.

[0089] Performance Testing

[0090] The safety performance of the single cells provided in the above embodiments and comparative examples was tested by packaging the cells with welding slag and then conducting a vibration test, disassembling the battery to observe whether the pole pieces were burned or peeled off.

[0091] The test results are shown in Table 1:

[0092] Table 1

[0093]

[0094]

[0095] It can be seen from Table 1 that:

[0096] The present invention has been proved through safety performance tests that Examples 1-4, by filling the pole ear in the gap between the shell and the current collecting component, have fewer pole piece burn and peeling phenomena than Example 1, and have a small risk of falling off, which can avoid short circuit of the single cell and improve the current carrying capacity of the battery; it can be seen from Examples 1 and 2 that the second edge area of ​​the current collecting component can directly contact the shell, and Example 2 has higher safety performance and makes the current carrying capacity more excellent; it can be seen from the comparison between Example 1 and Example 3, and between Example 2 and Example 4 that the pole ear in the first pole ear area is filled in the gap, and the risk of pole piece falling off is small.

[0097] In summary, the present invention provides a single cell battery and its application, wherein the pole ear of the single cell battery is filled into the gap between the current collecting component and the shell, so that the current collecting component can be electrically connected to the shell through the pole ear as a medium, thereby preventing problems such as explosion point and overcurrent caused by the gap between the current collecting component and the shell, avoiding short circuit inside the battery, and ensuring the overcurrent capacity of the battery cell and the shell.

[0098] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention are within the protection scope and disclosure scope of the present invention.

Claims

1. A single cell battery, characterized in that: The single cell battery comprises a battery core (1), a current collecting component (3) and a shell (2); A pole lug (4) extends from at least one end surface of the battery cell (1); The current collecting component (3) is arranged on the surface of the pole lug (4) and is electrically connected to the pole lug (4); The housing (2) is provided with a containing space for containing the battery core (1) and the current collecting component (3); There is a gap between at least part of the edge region of the current collecting component (3) and the shell (2), and the gap is filled with a pole lug (4), and the current collecting component (3) is electrically connected to the shell (2) via the pole lug (4) filled in the gap.

2. The single cell according to claim 1, characterized in that: The edge region of the current collecting member (3) comprises a first edge region and a second edge region, a gap exists between the first edge region and the shell (2), and the first edge region is electrically connected to the shell (2) via a pole ear (4), and the second edge region is in contact with and electrically connected to the shell (2).

3. The single cell according to claim 2, characterized in that: The edge region of the current collecting component (3) is bent in a direction away from the battery core (1) to form a bent portion, and the bent portion is electrically connected to the housing (2).

4. The single cell according to claim 1, characterized in that: There is a gap between any edge region of the current collecting component (3) and the shell (2), the gap is filled with a pole lug (4), and the current collecting component (3) is electrically connected to the shell (2) via the pole lug (4) filled in the gap.

5. The single cell according to claim 1, characterized in that: The battery core (1) is provided with a central hole (5), and the central hole (5) passes through the battery core (1); The pole lug (4) comprises a first pole lug region and a second pole lug region along the radial direction of the central hole (5), wherein the second pole lug region is located in a direction away from the central hole (5) from the first pole lug region; the first pole lug and / or the second pole lug are electrically connected to the current collecting member (3).

6. The single cell according to claim 5, characterized in that: The pole lug (4) of the first pole lug region is bent in a direction away from the center hole (5) at the end face of the battery cell (1) and extends into a gap between the current collecting component (3) and the shell (2); the current collecting component (3) is electrically connected to the shell (2) via the pole lug (4) of the first pole lug region.

7. The single cell according to claim 5, characterized in that: The pole lug (4) of the second pole lug region is bent in a direction away from the center hole (5) at the end face of the battery cell (1) and extends into a gap between the current collecting component (3) and the shell (2); the current collecting component (3) is electrically connected to the shell (2) via the pole lug (4) of the second pole lug region.

8. The single cell according to claim 1, characterized in that: The edge of the current collecting component (3) is provided with at least one notch.

9. A battery, characterized in that: The battery comprises a single cell as claimed in any one of claims 1 to 8.

10. An electrical device, characterized in that: The electric device comprises the battery as claimed in claim 9.

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