Battery cell structure and secondary battery

Abstract

The utility model provides a battery cell structure and a secondary battery. The battery cell structure comprises a battery cell main body, the battery cell main body comprises positive plates, positive tabs, negative plates, negative tabs and diaphragms, the positive plates and the negative plates are alternately stacked, the positive tabs and the negative tabs are respectively connected with the positive plates and the negative plates, and the positive tabs and the negative tabs are respectively arranged on two opposite sides of the battery cell main body along a first direction; the top cover is positioned on one side of the battery cell main body along the second direction, a positive pole and a negative pole are arranged on the top cover, the connecting pieces comprise positive connecting pieces and negative connecting pieces, the positive connecting pieces comprise a third positive connecting piece and a first positive connecting piece, and the negative connecting pieces comprise a third negative connecting piece and a first negative connecting piece; and the coating piece coats the outer surface of the battery cell main body, and the third positive connecting piece and the third negative connecting piece are positioned on the outer side of the coating piece. According to the utility model, the risk of corrosion of the aluminum shell possibly caused by contact between the falling cathode material of the battery cell and the aluminum shell in the prior art can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of new energy, and in particular to a battery core structure and a secondary battery. Background Art

[0002] With the rapid development of new energy technologies, there are more and more types of new energy batteries. With the widespread application of secondary batteries in various fields, the improvement of their performance and the guarantee of their safety have become important research topics. The energy density of secondary batteries is one of the key indicators to measure their performance, and the coating thickness is an important factor affecting the energy density. With the increase of the energy density of secondary batteries, the coating thickness also gradually increases, which brings higher requirements for the conductivity and peeling force of secondary batteries. During the long-term charging and discharging process of secondary batteries, the negative electrode material will undergo a process of expansion and contraction. This physical change may cause the negative electrode material to fall off, the so-called "powder falling" phenomenon. Negative electrode powder falling not only reduces the performance of the battery, but also may cause safety hazards. When the battery shell adopts an aluminum shell, since the positive electrode of the battery cell is conductively connected to the shell, when the negative electrode material partially falls off, if the fallen negative electrode material contacts the aluminum shell, it may cause corrosion of the aluminum shell, thereby affecting the safety of the battery.

[0003] As can be seen from the above, in the prior art, there is a problem that the negative electrode material of the battery cell may come into contact with the aluminum shell after it falls off, which may cause corrosion of the aluminum shell. Utility Model Content

[0004] The main purpose of the utility model is to provide a battery cell structure and a secondary battery to solve the problem in the prior art that the negative electrode material of the battery cell may come into contact with the aluminum shell after it falls off, which may cause corrosion of the aluminum shell.

[0005] In order to achieve the above-mentioned purpose, according to one aspect of the utility model, a battery cell structure is provided, including: a battery cell body, the battery cell body including a positive electrode sheet, a positive electrode ear, a negative electrode sheet, a negative electrode ear and a separator, the positive electrode sheet and the negative electrode sheet are alternately stacked, and a separator is arranged between the positive electrode sheet and the negative electrode sheet, the positive electrode ear and the negative electrode ear are respectively connected to the positive electrode sheet and the negative electrode sheet, and the positive electrode ear and the negative electrode ear are respectively arranged on opposite sides of the battery cell body along a first direction; a top cover and a connecting member, the top cover is located at the battery cell body along a second direction On one side, a positive electrode column and a negative electrode column are arranged on the top cover, the connector includes a positive connector and a negative connector, the positive connector includes a third positive connector electrically connected to the positive electrode column and a first positive connector electrically connected to the positive electrode ear, the negative connector includes a third negative connector electrically connected to the negative electrode column and a first negative connector electrically connected to the negative electrode ear; a covering member, the covering member covers the outer surface of the battery cell body and covers the first positive connector and the first negative connector, and the third positive connector and the third negative connector are located on the outside of the covering member.

[0006] Furthermore, the positive connector also includes a second positive connector, the negative connector also includes a second negative connector, the first positive connector, the second positive connector and the third positive connector are connected in sequence, the first negative connector, the second negative connector and the third negative connector are connected in sequence, and the second positive connector and the second negative connector are both soft connectors and respectively pass through the covering.

[0007] Furthermore, the second positive connector and the second negative connector each include a soft metal core and an insulating protective layer, and the insulating protective layer covers the soft metal core.

[0008] Furthermore, the insulating protective layer is fixedly connected to the covering member.

[0009] Furthermore, the insulating protective layer is connected to the covering member by hot-melt connection.

[0010] Furthermore, a liquid injection hole is provided on the top cover, and a through hole is correspondingly provided on the covering member. The through hole is provided corresponding to the liquid injection hole, and the through hole is used for injecting electrolyte.

[0011] Furthermore, the first direction is the width direction of the battery cell body, and the second direction is the length direction of the battery cell body.

[0012] Furthermore, the battery cell body is a laminated battery cell, and there are multiple positive electrode sheets, negative electrode sheets, positive electrode ears and negative electrode ears. Multiple positive electrode ears and multiple positive electrode sheets are arranged in a one-to-one correspondence, and multiple negative electrode ears and multiple negative electrode sheets are arranged in a one-to-one correspondence.

[0013] Further, the size of the positive electrode tab along the second direction is the same as the size of the positive electrode sheet along the second direction, and the size of the negative electrode tab along the second direction is the same as the size of the negative electrode sheet along the second direction.

[0014] According to another aspect of the utility model, a secondary battery is provided, comprising the above-mentioned battery cell structure.

[0015] According to the technical solution of the utility model, the battery cell structure includes: a battery cell body, a covering, a top cover and a connecting member, the battery cell body includes a positive electrode sheet, a positive electrode ear, a negative electrode sheet, a negative electrode ear and a diaphragm, the positive electrode sheets and the negative electrode sheets are alternately stacked, and a diaphragm is arranged between the positive electrode sheets and the negative electrode sheets, the positive electrode ear and the negative electrode ear are respectively connected to the positive electrode sheet and the negative electrode sheet, the positive electrode ear and the negative electrode ear are respectively arranged on two opposite sides of the battery cell body along a first direction, the top cover is located on one side of the battery cell body along a second direction, the top cover is provided with a positive electrode column and a negative electrode column, the connecting member includes a positive connecting member and a negative connecting member, the positive connecting member includes a third positive connecting member electrically connected to the positive electrode column and a first positive connecting member electrically connected to the positive electrode ear, the negative connecting member includes a third negative connecting member electrically connected to the negative electrode column and a first negative connecting member electrically connected to the negative electrode ear The first negative connector of the electrical connection, the covering member covers the outer surface of the battery body, and covers the first positive connector and the first negative connector, and the third positive connector and the third negative connector are located on the outside of the covering member. By arranging the covering member on the outer surface of the battery body, the covering member completely fits the outer surface of the battery body and avoids the third positive connector and the third negative connector, while being able to achieve electrical connection between the battery body and the positive electrode column and the negative electrode column, even if the negative electrode sheet of the battery body is continuously charged and discharged, the negative electrode material that has fallen off will be covered inside the covering member, and the covering member can have a certain storage effect on the fallen negative electrode material, thereby reducing the risk of corrosion of the aluminum shell caused by the contact between the negative electrode material of the battery cell and the aluminum shell after falling off in the prior art. In addition, the positive electrode ear, the negative electrode ear, the first positive connector, and the first negative connector are all covered by the covering member, which can prevent the positive electrode ear, the negative electrode ear, the first positive connector, and the first negative connector from contacting the shell to cause a short circuit of the secondary battery, thereby improving safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0017] Figure 1 An exploded schematic diagram showing a battery cell structure in a specific embodiment of the utility model; and

[0018] Figure 2 A schematic structural diagram of a covering member in a specific embodiment of the utility model is shown;

[0019] Figure 3 A structural schematic diagram showing an angle of a battery cell structure in a specific embodiment of the utility model;

[0020] Figure 4 A schematic structural diagram showing a cell structure from another angle in a specific embodiment of the utility model;

[0021] Figure 5 A schematic diagram of the assembly structure of a battery cell structure and a covering member in a specific embodiment of the utility model is shown;

[0022] Figure 6 A schematic structural diagram of a second positive connector and a second negative connector in a specific embodiment of the utility model is shown.

[0023] The above drawings include the following reference numerals:

[0024] 10. Battery cell body; 11. Positive electrode sheet; 12. Positive electrode ear; 13. Negative electrode sheet; 14. Negative electrode ear; 20. Cover; 201. Through hole; 30. Top cover; 31. Positive electrode column; 32. Negative electrode column; 40. Connector; 41. Positive connector; 411. First positive connector; 412. Second positive connector; 413. Third positive connector; 42. Negative connector; 421. First negative connector; 422. Second negative connector; 423. Third negative connector; 50. Soft metal core; 60. Insulating protective layer. DETAILED DESCRIPTION

[0025] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present utility model will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0026] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0027] In the present invention, unless otherwise specified, the directional words used, such as "up, down, top, bottom", usually refer to the directions shown in the drawings, or to the components themselves in the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned directional words are not used to limit the present invention.

[0028] Obviously, the embodiments described above are only some embodiments of the utility model, not all embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0029] In order to solve the problem in the prior art that the negative electrode material of the battery cell may come into contact with the aluminum shell after falling off, which may cause corrosion of the aluminum shell, the utility model provides a battery cell structure and a secondary battery. Among them, the secondary battery described below includes the battery cell structure described below.

[0030] like Figures 1 to 5As shown, the cell structure includes a cell body 10, a covering member 20, a top cover 30 and a connector 40. The cell body 10 includes a positive electrode sheet 11, a positive electrode tab 12, a negative electrode sheet 13, a negative electrode tab 14 and a separator, the positive electrode sheets 11 and the negative electrode sheets 13 are alternately stacked, and a separator is arranged between the positive electrode sheets 11 and the negative electrode sheets 13, the positive electrode tab 12 and the negative electrode tab 14 are respectively connected to the positive electrode sheet 11 and the negative electrode sheet 13, and the positive electrode tab 12 and the negative electrode tab 14 are respectively arranged on two opposite sides of the cell body 10 along the first direction. The top cover 30 is located on one side of the battery body 10 along the second direction. The top cover 30 is provided with a positive electrode column 31 and a negative electrode column 32. The connector 40 includes a positive connector 41 and a negative connector 42. The positive connector 41 includes a third positive connector 413 electrically connected to the positive electrode column 31 and a first positive connector 411 electrically connected to the positive electrode tab 12. The negative connector 42 includes a third negative connector 423 electrically connected to the negative electrode column 32 and a first negative connector 421 electrically connected to the negative electrode tab 14. The covering member 20 covers the outer surface of the battery body 10 and covers the first positive connector 411 and the first negative connector 421. The third positive connector 413 and the third negative connector 423 are located on the outer side of the covering member 20. It is particularly noted that in this embodiment, the battery body 10 can be a wound battery cell or a laminated battery cell, which is not limited here.

[0031] By setting the covering member 20 on the outer surface of the battery cell body 10, the covering member 20 completely fits the outer surface of the battery cell body 10 and avoids the third positive connector 413 and the third negative connector 423, while realizing the electrical connection between the battery cell body 10 and the positive electrode column 31 and the negative electrode column 32, even if the negative electrode sheet 13 has the negative electrode material falling off during the battery cell structure continuously undergoing the charging and discharging process, the falling negative electrode material will be covered inside the covering member 20, and the covering member 20 can have a certain storage effect on the falling negative electrode material, reducing the risk of aluminum shell corrosion caused by contact with the aluminum shell after the battery cell negative electrode material falls off in the prior art. In addition, the positive electrode ear 12, the negative electrode ear 14, the first positive connector 411, and the first negative connector 421 are all covered by the covering member 20, which can prevent the positive electrode ear 12, the negative electrode ear 14, the first positive connector 411, and the first negative connector 421 from contacting the shell to cause a short circuit of the secondary battery, etc., thereby improving safety.

[0032] It should be noted that in this embodiment, the first direction is the width direction of the battery body 10, and the second direction is the length direction of the battery body 10. Alternatively, the first direction is the length direction of the battery body 10, and the second direction is the width direction of the battery body 10.

[0033] In this embodiment, the connector 40 extends from the battery body 10 and is connected to the top cover 30 , and the top cover 30 is connected to a shell (not shown) of the secondary battery. Optionally, the connection between the top cover 30 and the shell is welding.

[0034] In this embodiment, the positive electrode column 31 and the negative electrode column 32 are arranged at intervals on the top cover 30, and the positive electrode column 31 and the positive electrode ear 12 of the battery cell body 10 are connected by the positive connector 41, and the negative electrode column 32 and the negative electrode ear 14 of the battery cell body 10 are connected by the negative connector 42, thereby completing the connection between the top cover 30 and the battery cell body 10. At the same time, the positive electrode ear 12 and the negative electrode ear 14 are arranged on both sides of the battery cell body 10, and the positive connector 41 and the negative connector 42 extend in the same direction for easy installation.

[0035] like Figure 1 As shown, the positive connector 41 also includes a second positive connector 412, the negative connector 42 also includes a second negative connector 422, the first positive connector 411, the second positive connector 412 and the third positive connector 413 are connected in sequence, the first negative connector 421, the second negative connector 422 and the third negative connector 423 are connected in sequence, and the second positive connector 412 and the second negative connector 422 are both soft connectors and respectively pass through the covering 20.

[0036] Specifically, the first positive connector 411, the third positive connector 413, the first negative connector 421 and the third negative connector 423 are all made of hard materials, and the second positive connector 412 and the second negative connector 422 are both soft connectors. Through this arrangement, a soft connection can be achieved between the top cover 30 and the battery cell body 10. Compared with the traditional hard connection method of using hard metal connecting sheets, the use of soft connectors can greatly reduce the space inside the shell occupied by the connector 40, thereby increasing the utilization rate of the space inside the shell.

[0037] like Figure 6 As shown, the second positive connector 412 and the second negative connector 422 each include a soft metal core 50 and an insulating protection layer 60 , wherein the insulating protection layer 60 covers the soft metal core 50 .

[0038] Specifically, the two ends of the soft metal core 50 are connected to the battery body 10 and the top cover 30 respectively, and the insulating protective layer 60 wraps the entire soft metal core 50 to prevent the soft metal core 50 from being electrically conductive with the shell, and the insulating protective layer 60 has a certain thickness and flexibility, so that during the installation of the top cover 30, even if the second positive connector 412 and the second negative connector 422 are bent multiple times, the insulating protective layer 60 will not be broken. Optionally, the insulating protective layer 60 is made of silicone or PE material.

[0039] In this embodiment, the insulating protection layer 60 is fixedly connected to the covering member 20 .

[0040] Specifically, the insulating protective layer 60 is fixedly connected to the covering member 20 , which can fix the covering member 20 to a certain extent, and prevent the negative electrode material from falling out of the gap between the covering member 20 and the insulating protective layer 60 and contacting the aluminum shell.

[0041] Furthermore, in this embodiment, the insulating protection layer 60 is connected to the covering member 20 by thermal melting.

[0042] In this embodiment, a liquid injection hole is provided on the top cover 30, and a through hole 201 is correspondingly provided on the covering member 20. The through hole 201 is provided corresponding to the liquid injection hole, and the through hole 201 is used for injecting electrolyte.

[0043] Specifically, the injection hole on the top cover 30 is matched with the through hole 201 , and the electrolyte enters the interior of the battery core structure through the through hole 201 , thereby achieving the infiltration of the electrolyte into the battery core body 10 .

[0044] In another embodiment of the present application which is not shown in the figure, the first positive connector 411 , the third positive connector 413 , the first negative connector 421 and the third negative connector 423 are welding sheets or metal sheets.

[0045] Furthermore, the first positive connector 411 and the positive electrode ear 12 and the second negative connector 422 and the negative electrode ear 14 are welded by ultrasonic welding, and the third positive connector 413 and the positive electrode column 31, and the third negative connector 423 and the negative electrode column 32 are welded by laser welding. In this embodiment, the first positive connector 411 is connected to the positive electrode ear 12 by spot welding, that is, a plurality of welding points are provided on the first positive connector 411, and optionally, the first positive connector 411 and the positive electrode ear 12 are fully welded. Similarly, the connection method between the second negative connector 422 and the negative electrode ear 14 is the same as the above-mentioned connection method.

[0046] In this embodiment, the positive electrode tab 12 and the negative electrode tab 14 are arranged on both sides of the battery cell body 10 along the width direction, that is, the length direction of the tabs coincides with the length direction of the battery cell body 10 .

[0047] In this embodiment, the battery body 10 is a laminated battery, and there are multiple positive electrode sheets 11, negative electrode sheets 13, positive electrode ears 12, and negative electrode ears 14. Multiple positive electrode ears 12 are arranged in a one-to-one correspondence with multiple positive electrode sheets 11, and multiple negative electrode ears 14 are arranged in a one-to-one correspondence with multiple negative electrode sheets 13. Further, the length of the positive electrode ear 12 is the same as the length of the positive electrode sheet 11, and the length of the negative electrode ear 14 is the same as the length of the negative electrode sheet 13.

[0048] Specifically, multiple positive electrode sheets 11 and multiple negative electrode sheets 13 are arranged in an alternating manner, and multiple positive electrode ears 12 and multiple negative electrode ears 14 are arranged on both sides of the battery cell body 10. The positive electrode ears 12 and the negative electrode ears 14 are respectively arranged on both sides of the longer sides of the battery cell body 10. This can increase the flow area, thereby greatly reducing the internal resistance of the battery cell structure.

[0049] In this embodiment, the plurality of positive electrode tabs 12 and the plurality of negative electrode tabs 14 are all welded and bent in the same direction.

[0050] Specifically, after the multiple positive tabs 12 and the multiple negative tabs 14 are bent, the battery body 10 as a whole is a roughly rectangular parallelepiped structure, and the covering member 20 is provided with multiple covering surfaces, and the multiple covering surfaces are arranged one by one corresponding to each surface of the battery body 10. Further, the covering member 20 is a mylar film, and after the connector 40 is connected to the battery body 10, the covering member 20 covers the entire battery body 10 and covers the part where the connector 40 is connected to the tabs, and the gaps between the covering surfaces are connected by heat welding. The specific covering method and connection method of the covering member 20 are conventional designs in the field and are not described in detail here.

[0051] The utility model also provides a secondary battery, comprising the above-mentioned battery core structure.

[0052] Furthermore, the secondary battery further includes a shell, which is welded to the top cover 30 , and optionally, the shell is an aluminum shell.

[0053] Taking the battery cell body 10 as a laminated battery cell as an example, the specific processing process is that multiple positive electrode sheets 11 and multiple negative electrode sheets 13 are alternately stacked, and the pole ears on both sides are folded downward, and then the first positive connector 411 and the first negative connector 421 are welded to the positive ear 12 and the negative ear 14, and the entire battery cell body 10, the first positive connector 411 and the first negative connector 421 are wrapped with the covering 20, the second positive connector 412 and the second negative connector 422 of the connector 40 pass through the covering 20, the third positive connector 413 and the third negative connector 423 are located outside the covering 20 and connected to the top cover 30, and finally the top cover 30 is welded to the shell, and the final secondary battery is obtained through processes such as drying, liquid injection, formation, and capacity division.

[0054] From the above description, it can be seen that the above-mentioned embodiments of the utility model achieve the following technical effects: by setting the battery cell structure including the battery cell body 10, the covering member 20, the top cover 30 and the connecting member 40, the battery cell body 10 includes the positive electrode sheet 11, the positive electrode ear 12, the negative electrode sheet 13, the negative electrode ear 14 and the diaphragm, the positive electrode sheet 11 and the negative electrode sheet 13 are alternately stacked, and a diaphragm is arranged between the positive electrode sheet 11 and the negative electrode sheet 13, the positive electrode ear 12 and the negative electrode ear 14 are respectively connected to the positive electrode sheet 11 and the negative electrode sheet 13, and the positive electrode ear The positive electrode tab 12 and the negative electrode tab 14 are respectively arranged on two opposite sides of the battery body 10 along the first direction, the top cover 30 is located on one side of the battery body 10 along the second direction, and the positive electrode column 31 and the negative electrode column 32 are arranged on the top cover 30. The connector 40 includes a positive connector 41 and a negative connector 42, the positive connector 41 includes a third positive connector 413 electrically connected to the positive electrode column 31 and a first positive connector 411 electrically connected to the positive electrode tab 12, and the negative connector 42 includes a third negative connector 423 electrically connected to the negative electrode column 32 and a first negative connector 424 electrically connected to the negative electrode column 32. The first negative connector 421 electrically connected to the tab 14, the covering member 20 covers the outer surface of the battery body 10, and covers the first positive connector 411 and the first negative connector 421, and the third positive connector 413 and the third negative connector 423 are located on the outside of the covering member 20. It is particularly noted that in this embodiment, the battery body 10 can be a wound battery cell or a laminated battery cell, which is not limited here. By arranging the covering member 20 on the outer surface of the battery body 10, the covering member 20 completely fits the appearance of the battery body 10 The surface of the battery cell 10 and the third positive connector 413 and the third negative connector 423 are avoided. While the electrical connection between the battery cell body 10 and the positive electrode column 31 and the negative electrode column 32 can be realized, even if the negative electrode material of the negative electrode sheet 13 falls off during the battery cell structure continuously undergoes charge and discharge, the fallen negative electrode material will be wrapped inside the wrapping member 20. The wrapping member 20 can have a certain storage effect on the fallen negative electrode material, reducing the risk of corrosion of the aluminum shell caused by the contact between the negative electrode material of the battery cell and the aluminum shell after the fall off in the prior art. The positive electrode ear 12, the negative electrode ear 14, the first positive connector 411, and the first negative connector 421 are all covered by the wrapping member 20, which can prevent the positive electrode ear 12, the negative electrode ear 14, the first positive connector 411, and the first negative connector 421 from contacting the shell to cause a short circuit in the secondary battery, etc., thereby improving safety.

[0055] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0056] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0057] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be subject to various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A battery cell structure, characterized in that: include: A battery cell body (10), the battery cell body (10) comprising a positive electrode sheet (11), a positive electrode ear (12), a negative electrode sheet (13), a negative electrode ear (14) and a separator, the positive electrode sheet (11) and the negative electrode sheet (13) are alternately stacked, and the separator is arranged between the positive electrode sheet (11) and the negative electrode sheet (13), the positive electrode ear (12) and the negative electrode ear (14) are respectively connected to the positive electrode sheet (11) and the negative electrode sheet (13), and the positive electrode ear (12) and the negative electrode ear (14) are respectively arranged on two opposite sides of the battery cell body (10) along a first direction; A top cover (30) and a connector (40), wherein the top cover (30) is located on one side of the battery cell body (10) along the second direction, and a positive electrode column (31) and a negative electrode column (32) are arranged on the top cover (30), and the connector (40) comprises a positive connector (41) and a negative connector (42), wherein the positive connector (41) comprises a third positive connector (413) electrically connected to the positive electrode column (31) and a first positive connector (411) electrically connected to the positive electrode ear (12), and the negative connector (42) comprises a third negative connector (423) electrically connected to the negative electrode column (32) and a first negative connector (421) electrically connected to the negative electrode ear (14); A covering member (20), the covering member (20) covering the outer surface of the battery cell body (10) and covering the first positive connector (411) and the first negative connector (421), the third positive connector (413) and the third negative connector (423) being located outside the covering member (20).

2. The battery cell structure according to claim 1, characterized in that: The positive connector (41) further includes a second positive connector (412), and the negative connector (42) further includes a second negative connector (422). The first positive connector (411), the second positive connector (412) and the third positive connector (413) are connected in sequence, and the first negative connector (421), the second negative connector (422) and the third negative connector (423) are connected in sequence. The second positive connector (412) and the second negative connector (422) are both soft connectors and respectively pass through the covering member (20).

3. The battery cell structure according to claim 2, characterized in that: The second positive connector (412) and the second negative connector (422) both include a soft metal core (50) and an insulating protective layer (60), wherein the insulating protective layer (60) covers the soft metal core (50).

4. The battery cell structure according to claim 3, characterized in that: The insulating protective layer (60) is fixedly connected to the covering member (20).

5. The battery cell structure according to claim 4, characterized in that: The insulating protective layer (60) is connected to the covering member (20) by thermal melting.

6. The battery cell structure according to claim 1, characterized in that: The top cover (30) is provided with a liquid injection hole, and the covering member (20) is correspondingly provided with a through hole (201), the through hole (201) being provided corresponding to the liquid injection hole, and the through hole (201) is used for injecting electrolyte.

7. The battery cell structure according to claim 1, characterized in that: The first direction is the width direction of the battery cell body (10), and the second direction is the length direction of the battery cell body (10).

8. The battery cell structure according to claim 7, characterized in that: The battery cell body (10) is a laminated battery cell, and the positive electrode sheet (11), the negative electrode sheet (13), the positive electrode ear (12) and the negative electrode ear (14) are all multiple, and the multiple positive electrode ears (12) and the multiple positive electrode sheets (11) are arranged in a one-to-one correspondence, and the multiple negative electrode ears (14) and the multiple negative electrode sheets (13) are arranged in a one-to-one correspondence.

9. The battery cell structure according to claim 8, characterized in that: The size of the positive electrode tab (12) along the second direction is the same as the size of the positive electrode sheet (11) along the second direction, and the size of the negative electrode tab (14) along the second direction is the same as the size of the negative electrode sheet (13) along the second direction.

10. A secondary battery, characterized in that: A battery cell structure comprising any one of claims 1 to 9.

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