Battery top cover and secondary battery

Abstract

The utility model provides a kind of battery top cover and secondary battery, battery top cover includes cover, pole, lower plastic and tab protection plate, pole is passed through the both ends of cover in the thickness direction of cover, lower plastic and tab protection plate are located in the same side of cover in the thickness direction of cover;The material of tab protection plate is insulating material;The shielding portion of tab protection plate is located at the outside of at least one side of pole in the width direction of cover, shielding portion extends to exceed lower plastic in the thickness direction of cover towards the direction away from cover direction.This utility model forms physical isolation barrier between tab and the shell of battery by setting tab protection plate extending away from cover direction in the lateral direction of pole along the width direction of cover, effectively prevent tab from directly contacting with the shell of battery due to deviation or vibration, even in the case of cell insulating film failure, tab is also in contact with insulating tab protection plate, avoid seal failure and life reduction caused by electrolyte corrosion shell of battery.

Description

Technical Field

[0001] This utility model relates to the field of batteries, and in particular to a battery top cover and a secondary battery. Background Technology

[0002] In existing technology, a connectorless solution for prismatic batteries involves directly welding the cell's tabs to the top cover terminals to form an electrical connection. During welding, the tabs are bent to allow welding to the terminals via their larger surfaces. Due to misalignment in the pre-welded tab positioning, the bent tabs can easily come into contact with the aluminum casing on their outer edge in the battery's width direction. When the tabs contact the aluminum casing, any residual electrolyte or other chemicals on the tabs can corrode the aluminum casing, not only compromising its integrity but also causing seal failure, allowing external air and moisture to enter the battery.

[0003] Currently, battery cells are wrapped with an insulating film to isolate the cell from the aluminum casing. The end of the insulating film facing the top cover is fixed to the lower plastic on the top cover to seal the cell. The insulating film also separates the tabs from the aluminum casing. However, when the battery is subjected to factors such as prolonged vibration, the connection between the insulating film and the lower plastic can detach, causing the tabs to be exposed and potentially come into contact with the aluminum casing, causing corrosion. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the defects in the prior art where the tabs and the battery casing are prone to contact, which leads to corrosion of the battery casing, reduces battery sealing and battery casing lifespan, and provides a battery top cover and a secondary battery.

[0005] The present invention solves the above-mentioned technical problems through the following technical solution:

[0006] A battery top cover includes a cover plate, terminals, a lower plastic insert, and a tab protection plate. The terminals pass through both ends of the cover plate in the thickness direction of the cover plate, and the lower plastic insert and the tab protection plate are disposed on the same side of the cover plate in the thickness direction of the cover plate.

[0007] The electrode protection plate is made of insulating material; the electrode protection plate includes a shielding portion, which is disposed outside at least one side of the electrode post in the width direction of the cover plate, and the shielding portion extends beyond the lower plastic along the thickness direction of the cover plate in a direction away from the cover plate.

[0008] In this solution, a tab protection plate extending away from the cover plate is provided laterally along the width direction of the electrode post, forming a physical isolation barrier between the tab and the battery casing. This effectively prevents the tab from directly contacting the battery casing due to displacement or vibration. Even if the cell insulation film fails, the tab will still contact the insulating tab protection plate, avoiding sealing failure and reduced lifespan caused by electrolyte corrosion of the battery casing.

[0009] Preferably, the battery top cover satisfies one or more of the following conditions:

[0010] a. Define the length of the cover plate as x1, and the length of the blocking part along the length direction of the cover plate as x2; wherein... ;

[0011] b. Define the width of the cover plate as y1, and the distance between the blocking portion and the edge of the corresponding side of the pole post in the width direction of the cover plate as y2; wherein, ;

[0012] c. The height of the shielding part in the thickness direction of the cover plate is greater than or equal to 2mm;

[0013] d. The wall thickness of the shielding part is 0.1~5mm.

[0014] In this solution, by limiting multiple dimensions of the tab protection plate, it is ensured that the tab protection plate can completely separate the battery casing and the tabs, thereby improving the isolation effect on the tabs.

[0015] Preferably, the tab protection plate is integrally formed with the lower plastic, and the tab protection plate can be bent relative to the lower plastic in a direction away from the cover plate.

[0016] In this solution, the one-piece molding process simplifies the assembly process and improves structural stability.

[0017] Preferably, the tab protection plate is injection molded with the lower plastic.

[0018] In this solution, the tab protection plate and the lower plastic can be molded from the same material, simplifying the molding process and reducing molding costs.

[0019] Preferably, a bending auxiliary structure is provided at the boundary between the tab protection plate and the lower plastic.

[0020] In this design, the bending auxiliary structure can reduce the bending difficulty of the tab protection plate and avoid fracture caused by stress concentration during bending.

[0021] Preferably, the bending aid structure is an indentation or a semi-tangent.

[0022] In this scheme, the above-mentioned structure is simple and easy to manufacture.

[0023] Preferably, the lower plastic and the tab protection plate are separately disposed, and the tab protection plate further includes a connecting part. The connecting part abuts against the end of the lower plastic away from the cover plate in the thickness direction. The connecting part is provided with a positioning hole, which is through both ends in the thickness direction of the cover plate, and the pole passes through the positioning hole.

[0024] In this design, the split structure facilitates the replacement of damaged tab protection plates. Positioning holes, in conjunction with the electrode posts, resolve installation misalignment issues associated with the split components.

[0025] Preferably, each pole post includes two tab connection portions, the two tab connection portions are spaced apart in the width direction of the cover plate, and are both located on the side of the cover plate where the tab protection plate is provided in the thickness direction of the cover plate. The tab protection plate is provided on the side of the two tab connection portions that are opposite to each other in the width direction of the cover plate.

[0026] In this design, the tab can be bent in two parts from both sides of the cover plate in the width direction to reduce the thickness of the tab on one side, thereby increasing the gap between the tab on one side and the battery casing and reducing the possibility of contact between the tab and the battery casing.

[0027] A secondary battery includes a cell, a casing, and a battery top cover as described above. The casing and the battery top cover form a receiving space for accommodating the cell. The tabs of the cell are connected to the terminals. A tab protection plate is disposed within the receiving space. A shielding portion is located between the casing and the cell in the width direction of the cover plate.

[0028] In this design, the tab protection plate is located between the casing and the cell, directly blocking the contact path between the tab and the casing, significantly improving battery sealing and casing life.

[0029] Preferably, the battery cell includes a battery cell assembly and an insulating film, the insulating film covering the outer surface of the battery cell assembly, and the shielding portion being bonded to the insulating film.

[0030] In this design, the connection between the tab protection plate and the insulating film increases the fixation position of the battery top cover and the cell, preventing positional changes in the battery top cover and cell due to failure of the connection between the insulating film and the lower plastic. This reduces the possibility of the tabs being exposed from the insulating film, thereby improving the isolation effect on the tabs. Furthermore, the connection between the tab protection plate and the insulating film prevents the tab protection plate from shifting, ensuring contact between the tabs and the protection plate even after the tabs are exposed from the insulating film.

[0031] The positive and progressive effects of this utility model are as follows: By providing a tab protection plate extending away from the cover plate along the width direction of the electrode post, a physical isolation barrier is formed between the tab and the battery casing, effectively preventing the tab from directly contacting the battery casing due to displacement or vibration. Even if the cell insulation film fails, the tab will still contact the insulating tab protection plate, avoiding the sealing failure and reduced lifespan caused by electrolyte corrosion of the battery casing. Attached Figure Description

[0032] Figure 1 This is a three-dimensional structural diagram of the secondary battery according to Embodiment 1 of this utility model.

[0033] Figure 2 This is a schematic diagram of the internal structure of the secondary battery in Embodiment 1 of this utility model.

[0034] Figure 3 This is a schematic diagram of the connection between the battery top cover and the electrode tab in Embodiment 1 of this utility model.

[0035] Figure 4 This is a schematic diagram of the battery top cover of Embodiment 1 of this utility model.

[0036] Figure 5 This is a schematic diagram of the structure of the battery top cover and the battery cell in Embodiment 1 of this utility model.

[0037] Figure 6 This is another structural diagram of the battery top cover and the battery cell in Embodiment 1 of this utility model.

[0038] Figure 7 This is a schematic diagram of the bending auxiliary structure of Embodiment 2 of this utility model.

[0039] Figure 8 This is a schematic diagram of the bending auxiliary structure of Embodiment 3 of this utility model.

[0040] Figure 9 This is a schematic diagram of the tab protection plate of Embodiment 4 of this utility model.

[0041] Figure 10 This is a schematic diagram of the battery top cover of Embodiment 4 of this utility model.

[0042] Explanation of reference numerals in the attached figures:

[0043] Cell 1

[0044] Insulating film 11

[0045] Ear 12

[0046] Shell 2

[0047] Battery top cover 3

[0048] Cover plate 31

[0049] 32 pole

[0050] Electrode Connection 321

[0051] Lower plastic 33

[0052] Tab Protection Board 34

[0053] Shielding part 341

[0054] Connecting part 342

[0055] Positioning hole 343

[0056] Storage space 4

[0057] Bending auxiliary structure 5 Detailed Implementation

[0058] The present invention will be described more clearly and completely below with reference to the accompanying drawings, using a preferred embodiment.

[0059] Example 1

[0060] like Figure 1 and Figure 2 As shown, this embodiment discloses a secondary battery, including a battery cell 1, a housing 2, and a battery top cover 3. The upper end of the housing 2 has an opening, and the battery top cover 3 is connected to the housing 2 and seals the opening of the housing 2. The housing 2 and the battery top cover 3 form a receiving space 4 for accommodating the battery cell 1. The battery cell 1 is placed in the receiving space 4, and the battery cell 1 is sealed by the cooperation of the housing 2 and the battery top cover 3.

[0061] Specifically, such as Figures 1-3 As shown, the battery cell 1 includes a battery cell assembly and an insulating film 11. The insulating film 11 covers the outer surface of the battery cell assembly to isolate the housing 2 from the battery cell assembly and prevent the battery cell assembly from corroding the housing 2. The battery top cover 3 includes a cover plate 31, terminals 32, and a lower plastic 33. The cover plate 31 covers the opening on the housing 2, and the terminals 32 pass through the cover plate 31 in the thickness direction of the cover plate 31. Figure 2 The two ends in the X direction of the pole post 32 are such that one end of the pole post 32 ( Figure 2 The lower end of the middle electrode post 32 extends into the receiving space 4 to connect with the electrode tab 12 of the cell assembly, and the other end of the electrode post 32 ( Figure 2 The upper end of the middle electrode post 32 is located outside the housing space 4 for connection with other electrical equipment. The lower plastic 33 is disposed on the side of the cover plate 31 facing the housing space 4 to isolate the battery cell assembly from other parts of the cover plate 31. The end of the insulating film 11 of the battery cell 1 facing the cover plate 31 is fixedly connected to the lower plastic 33 by means of heat fusion or the like to achieve sealing of the side of the battery cell assembly facing the cover plate 31.

[0062] like Figure 2 , Figures 4-6 As shown, the battery top cover 3 also includes a tab protection plate 34. The tab protection plate 34 and the lower plastic 33 are located on the same side of the cover plate 31 in the thickness direction of the cover plate 31, that is, the tab protection plate 34 is also located within the receiving space 4. In this embodiment, the tab protection plate 34 is made of insulating material and is used to isolate the shell 2 and the tabs 12 of the cell 1 to prevent the electrolyte on the tabs 12 from corroding the shell 2, prevent the secondary battery from failing to seal, and improve the service life of the secondary battery.

[0063] Specifically, such as Figure 2 , Figures 4-6 As shown, the electrode protection plate 34 includes a shielding part 341, which is disposed on the electrode post 32 in the width direction of the cover plate 31. Figure 2 The shielding portion 341 is located between the housing 2 and the battery cell 1 in the width direction of the cover plate 31, at least one side of the outer side of the cover plate 31 in the Y direction. The shielding portion 341 extends beyond the lower plastic 33 in the thickness direction of the cover plate 31 in a direction away from the cover plate 31.

[0064] In this embodiment, a tab protection plate 34 extending away from the cover plate 31 is provided laterally on the pole post 32 along the width direction of the cover plate 31, forming a physical isolation barrier between the tab 12 and the housing 2. This directly blocks the contact path between the tab 12 and the housing 2, effectively preventing the tab 12 from directly contacting the battery housing 2 due to offset or vibration. Even if the connection between the insulating film 11 and the lower plastic 33 of the cell 1 fails, the tab 12 will still contact the insulating tab protection plate 34, avoiding the sealing failure and life reduction caused by electrolyte corrosion of the battery housing 2, and significantly improving the battery sealing performance and the life of the housing 2.

[0065] Furthermore, the shielding part 341 can be bonded and fixed to the insulating film 11 of the battery cell 1 by means of tape or the like, thereby increasing the fixed position of the battery top cover 3 and the battery cell 1, preventing positional changes of the battery top cover 3 and the battery cell 1 due to failure of the connection between the insulating film 11 and the lower plastic 33, reducing the possibility of the tab 12 being exposed to the insulating film 11, and thus improving the isolation effect on the tab 12. Moreover, the tab protection plate 34 is connected to the insulating film 11, which can prevent the position of the tab protection plate 34 from moving, so as to ensure that the tab 12 can still contact the tab protection plate 34 after it is exposed to the insulating film 11.

[0066] like Figure 2 and Figure 4As shown, in this embodiment, the electrode post 32 includes a positive electrode post and a negative electrode post. Each electrode post 32 includes two tab connection portions 321. The two tab connection portions 321 are spaced apart in the width direction of the cover plate 31 and are both located on the side of the cover plate 31 where the tab protection plate 34 is provided in the thickness direction of the cover plate 31. That is, both tab connection portions 321 are located within the receiving space 4. The two tab connection portions 321 of a single electrode post 32 are used to connect with the tabs 12 of the same electrode. The tabs 12 of the same electrode can be divided into two parts and bent in batches from both sides of the width direction of the cover plate 31 to reduce the thickness of the tab 12 on one side, thereby increasing the gap between the tab 12 on one side and the battery casing 2 and reducing the possibility of the tab 12 contacting the battery casing 2.

[0067] In this embodiment, as Figure 2 As shown, the two tabs 321 of a single electrode post 32 are provided with tab protection plates 34 on opposite sides of the cover plate 31 in the width direction, so as to ensure that the two tabs 12 of the same electrode will not directly contact the housing 2, which significantly improves the battery sealing and the life of the housing 2.

[0068] In other alternative embodiments, when the tabs 12 of the same electrode are all bent from the same side of the cover plate 31 in the width direction to connect with the pole post 32, the tab protection plate 34 can be provided only on the side where the tab 12 is bent, or the tab protection plate 34 can be provided on both sides of the cover plate 31 in the width direction.

[0069] like Figure 6 As shown, the length of the cover plate 31 is defined as x1, and the blocking part 341 is in the length direction of the cover plate 31 ( Figure 6 The length along the Z direction (in the image) is x2; where, This embodiment ensures that the tab protection plate 34 can cover the offset of the tab 12 in the length direction of the cover plate 31 by limiting the length dimension of the shielding part 341, thereby improving the isolation effect on the tab 12, reducing material waste, and lowering costs. Furthermore, the preferred range of x2 is 15~40mm.

[0070] like Figure 2 As shown, the width of the cover plate 31 is defined as y1, and the distance between the blocking part 341 and the edge of the pole post 32 on the corresponding side in the width direction of the cover plate 31 is y2; wherein, This embodiment limits the distance between the blocking portion 341 and the edge of the corresponding side of the pole post 32 in the width direction of the cover plate 31, ensuring both the interception of the offset pole tab 12 and the welding space between the pole tab 12 and the pole post 32. Furthermore, the preferred range for y2 is 5~30mm.

[0071] like Figure 6As shown, the distance between the end of the cell 1 away from the cover plate 31 in the thickness direction and the end face of the cover plate 31 away from the lower plastic 33 in the thickness direction is defined as c1, and the height of the shielding part 341 in the thickness direction of the cover plate 31 is defined as c2; where 2≦c2≦c1. This embodiment, by limiting the height of the shielding part 341 in the thickness direction of the cover plate 31, ensures that the tab protection plate 34 can completely cover the maximum outward protrusion height of the tab 12 after bending, completely separating the battery casing 2 and the tab 12, thus improving the isolation effect on the tab 12. Further, the preferred range of c2 is 15~40mm.

[0072] In this embodiment, the wall thickness of the shielding part 341 is 0.1~5mm, more preferably 0.1~1mm, so as to ensure the separation effect while avoiding the shielding part 341 occupying too much space in the width direction of the cover plate 31, preventing the battery cell 1 housing space 4 from being occupied too much, thereby ensuring the power of the battery cell 1.

[0073] In other alternative embodiments, the dimensions of the shielding part 341 can be designed to other values ​​according to actual needs, as long as it can completely isolate the tab 12 and the housing 2.

[0074] In this embodiment, the four shielding parts 341 are the same size. In other alternative embodiments, the dimensions of the four shielding parts 341 can be the same or different, as long as they can completely isolate the tab 12 and the housing 2.

[0075] like Figure 4 As shown, in this embodiment, the tab protection plate 34 and the lower plastic 33 are integrally formed, specifically by injection molding from the same material. The tab protection plate 34 has a thin wall thickness, and the plastic is flexible, allowing it to be bent relative to the lower plastic 33 in a direction away from the cover plate 31, thus being positioned between the insulating film 11 and the housing 2 of the battery cell 1. In this embodiment, the tab protection plate 34 can be bent at any position, thereby adapting to battery cells 1 of different sizes and improving its applicability.

[0076] The one-piece molding process simplifies the assembly process and improves structural stability. Molding from the same material simplifies the molding process and reduces molding costs. In other alternative embodiments, the tab protection plate 34 and the lower plastic 33 can be integrally molded from different materials.

[0077] In this embodiment, the secondary battery has only one battery top cover 3, and both the positive and negative terminals of the secondary battery are located on the same battery top cover 3. In other alternative embodiments, the tab protection plate 34 described above is also applicable to secondary batteries with two battery top covers 3 (i.e., the positive and negative terminals are located on different battery top covers).

[0078] Example 2

[0079] like Figure 7 As shown, based on Embodiment 1, this embodiment further discloses that a bending auxiliary structure 5 is provided at the boundary between the tab protection plate 34 and the lower plastic 33. The bending auxiliary structure 5 can reduce the bending difficulty of the tab protection plate 34 and avoid breakage caused by bending stress concentration.

[0080] like Figure 7 As shown, the bending aid structure 5 in this embodiment is an indentation. Specifically, the indentation in this embodiment is a groove structure with a triangular cross-section, which is simple in structure and easy to process. In other alternative embodiments, the cross-section of the indentation can also be other shapes, such as semicircles, rectangles, or other structures that can assist in bending.

[0081] Compared to the tab protection plate 34 in Embodiment 1, which can be bent at any position, the tab protection plate 34 in this embodiment is preferably bent at the position where the bending auxiliary structure 5 is provided. Figure 7 Only one bending auxiliary structure 5 is shown in the diagram. In practice, multiple bending auxiliary structures can be set along the curve. Figure 7 The bending auxiliary structure 5 is set at intervals in the M1 direction.

[0082] Example 3

[0083] like Figure 8 As shown, based on Embodiment 1, this embodiment further discloses that a bending auxiliary structure 5 is provided at the boundary between the tab protection plate 34 and the lower plastic 33. The bending auxiliary structure 5 can reduce the bending difficulty of the tab protection plate 34 and avoid breakage caused by bending stress concentration.

[0084] like Figure 8 As shown, the bending auxiliary structure 5 in this embodiment is a semi-tangent, specifically a plurality of discontinuous micro-cuts formed along the length direction of the cover plate 31. The structure is simple and easy to process.

[0085] Compared to the tab protection plate 34 in Embodiment 1, which can be bent at any position, the tab protection plate 34 in this embodiment is preferably bent at the position where the bending auxiliary structure 5 is provided. Figure 8 Only one bending auxiliary structure 5 is shown in the diagram. In practice, multiple bending auxiliary structures can be set along the curve. Figure 8 The bending auxiliary structure 5 is set at intervals in the M2 direction.

[0086] Example 4

[0087] The battery top cover 3 in this embodiment is basically the same as that in embodiment 1, except that:

[0088] like Figure 9 and Figure 10As shown, in this embodiment, the lower plastic 33 and the tab protection plate 34 are separately configured. The tab protection plate 34 also includes a connecting part 342. The shielding part 341 is connected to the connecting part 342. The connecting part 342 abuts against the end of the lower plastic 33 away from the cover plate 31 in the thickness direction. The connecting part 342 is provided with a positioning hole 343, which passes through both ends of the cover plate 31 in the thickness direction. The pole post 32 passes through the positioning hole 343. The separate design facilitates the replacement of the damaged tab protection plate 34. The positioning hole 343 cooperates with the pole post 32 for positioning, solving the problem of installation deviation of the separate components.

[0089] In this embodiment, the connecting part 342 is not further fixed to the lower plastic 33. Instead, after the battery cell 1 and the battery top cover 3 are assembled, it is directly pressed between the lower plastic 33 and the battery cell 1, and fixed by the pressing force. In other alternative embodiments, the connecting part 342 can be further fixed to the lower plastic 33 by means of bonding or other methods.

[0090] like Figure 10 As shown, in this embodiment, the tab protection plates 34 on the corresponding sides of the two tab connection portions 321 in a single terminal post 32 are separate structures, individually sleeved on the corresponding tab connection portions 321. The connection portions 342 of the two tab protection plates 34 are spaced apart to expose the explosion-proof holes and other structures on the battery top cover 3. In other alternative embodiments, the tab protection plates 34 on the corresponding sides of the two tab connection portions 321 in a single terminal post 32 can also be integrated, with through holes opened at corresponding positions on the tab protection plates 34 to expose the explosion-proof holes and other structures on the battery top cover 3.

[0091] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship of the device or component shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0092] While specific embodiments of this utility model have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of this utility model is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of this utility model, but all such changes and modifications fall within the scope of protection of this utility model.

Claims

1. A battery top cover, characterized in that, The battery top cover includes a cover plate, terminal posts, a lower plastic part, and a tab protection plate. The terminal posts pass through both ends of the cover plate in the thickness direction of the cover plate. The lower plastic part and the tab protection plate are located on the same side of the cover plate in the thickness direction of the cover plate. The electrode protection plate is made of insulating material; the electrode protection plate includes a shielding portion, which is disposed outside at least one side of the electrode post in the width direction of the cover plate, and the shielding portion extends beyond the lower plastic along the thickness direction of the cover plate in a direction away from the cover plate.

2. The battery top cover as described in claim 1, characterized in that, The battery top cover satisfies one or more of the following conditions: a. Define the length of the cover plate as x1, and the length of the blocking part along the length direction of the cover plate as x2; wherein... ; b. Define the width of the cover plate as y1, and the distance between the blocking portion and the edge of the corresponding side of the pole post in the width direction of the cover plate as y2; wherein, ; c. The height of the shielding part in the thickness direction of the cover plate is greater than or equal to 2mm; d. The wall thickness of the shielding part is 0.1~5mm.

3. The battery top cover as described in claim 1, characterized in that, The tab protection plate is integrally formed with the lower plastic, and the tab protection plate can be bent relative to the lower plastic in a direction away from the cover plate.

4. The battery top cover as described in claim 3, characterized in that, The electrode protection plate is injection molded with the lower plastic.

5. The battery top cover as described in claim 3, characterized in that, A bending auxiliary structure is provided at the boundary between the tab protection plate and the lower plastic.

6. The battery top cover as described in claim 5, characterized in that, The bending auxiliary structure is an indentation or a semi-tangent.

7. The battery top cover as described in claim 1, characterized in that, The lower plastic and the tab protection plate are separately disposed. The tab protection plate also includes a connecting part. The connecting part abuts against the end of the lower plastic away from the cover plate in the thickness direction. The connecting part is provided with a positioning hole. The positioning hole passes through both ends of the cover plate in the thickness direction. The pole passes through the positioning hole.

8. The battery top cover as described in any one of claims 1-7, characterized in that, Each electrode post includes two electrode tab connection parts, which are spaced apart in the width direction of the cover plate and are both located on the side of the cover plate where the electrode tab protection plate is provided in the thickness direction of the cover plate. The electrode tab protection plate is provided on the side of the cover plate where the two electrode tab connection parts are opposite to each other in the width direction of the cover plate.

9. A secondary battery, characterized in that, The secondary battery includes a cell, a casing, and a battery top cover as described in any one of claims 1-8. The casing and the battery top cover form a receiving space for accommodating the cell. The tabs of the cell are connected to the terminals. The tab protection plate is disposed within the receiving space. The shielding portion is located between the casing and the cell in the width direction of the cover plate.

10. The secondary battery as described in claim 9, characterized in that, The battery cell includes a battery cell assembly and an insulating film. The insulating film covers the outer surface of the battery cell assembly, and the shielding portion is bonded to the insulating film.

Images