Battery cell structure and battery module

Abstract

The utility model discloses a battery cell structure and a battery module, and relates to the technical field of batteries. The battery cell structure comprises a shell, a plastic part, a pole group assembly and a cover plate assembly, the shell comprises a top plate, the shell is provided with an opening relative to the top plate, and two groups of connecting assemblies are arranged on the top plate; the plastic part comprises a first insulating part and a second insulating part which are connected, the first insulating part and the second insulating part are located on the two opposite sides of the top plate respectively, and the first insulating part is located between the two connecting assemblies and the top plate; the pole group assembly is arranged in the shell, the pole group assembly comprises a pole group body and two pole lug structures, the second insulation part is located between the pole group body and the top plate, and the two pole lug structures penetrate through the plastic part and are electrically connected with the corresponding connecting assemblies; the cover plate assembly is connected with the shell and blocks the opening. According to the battery cell structure, the influence of the welding cover plate on the tab structure can be avoided, the electrical property of the battery cell structure is ensured, and the safety of the battery cell structure is improved.

Description

Technical Field

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

[0002] With the rapid advancement of new energy battery technology, the market penetration of new energy vehicles is gradually increasing, and people are focusing on the range of new energy vehicles. In response to these issues, how to improve the energy density of batteries has become a technical challenge that power battery manufacturers need to continuously overcome.

[0003] In the prior art, to improve space utilization within the battery cell structure, the tabs are typically connected to the poles after passing through the cover plate, eliminating the need for a busbar and preventing the poles from encroaching on the space within the battery cell structure. However, the distance between the cover plate and the tabs is small, and the high temperature, gases, and spatter generated during cover plate welding can affect the tabs, compromising the electrical performance and, consequently, the safety of the battery cell structure. Utility Model Content

[0004] The purpose of the utility model is to provide a battery cell structure and a battery module, which can avoid the influence of the welding cover plate on the tab structure, ensure the electrical performance of the battery cell structure, and improve the safety of the battery cell structure.

[0005] To achieve this purpose, the present invention adopts the following technical solutions:

[0006] A battery cell structure, comprising:

[0007] A housing, the housing comprising a top plate, the housing having an opening relative to the top plate, and two sets of connection components being provided on the top plate;

[0008] a plastic part, comprising a first insulating portion and a second insulating portion connected to each other, wherein the first insulating portion and the second insulating portion are respectively located on opposite sides of the top plate, and the first insulating portion is located between the two groups of the connecting components and the top plate;

[0009] A pole group assembly is disposed in the housing, the pole group assembly comprising a pole group body and two pole lug structures, the second insulating portion is located between the pole group body and the top plate, and the two pole lug structures are both disposed through the plastic part and electrically connected to the corresponding connecting assembly;

[0010] A cover plate assembly is connected to the shell and blocks the opening.

[0011] As an optional solution to the above-mentioned battery cell structure, the pole ear structure includes a connecting portion and a transition portion, the dimension of the transition portion in the thickness direction of the pole group assembly gradually decreases in the direction approaching the connecting portion, and the second insulating portion is provided with a shaping portion on the side facing the pole group assembly, the shaping portion is provided with a through hole corresponding to the connecting portion, the connecting portion is passed through the through hole, and the shaping portion is configured to abut the transition portion to shape the transition portion.

[0012] As an optional solution for the above-mentioned battery cell structure, the shaping portion includes two shaping surfaces that are spaced apart and arranged at an angle, the through hole is located between the two shaping surfaces, the distance between the two shaping surfaces gradually decreases in the direction approaching the through hole, and the shaping surface is configured to press against the surface of the transition portion on one side of the connecting portion.

[0013] As an optional solution of the above-mentioned battery cell structure, the battery cell structure further includes a support plate, which is arranged in the shell and located between the electrode group assembly and the cover plate assembly.

[0014] As an optional solution to the above-mentioned battery cell structure, the connecting assembly also includes a pole and a connecting plate. The first insulating part is provided with a connecting groove, and the connecting plate is arranged in the connecting groove. The pole ear structure passes through the partially bent part of the plastic part and is electrically connected to the pole through the connecting plate.

[0015] As an optional solution to the above-mentioned battery core structure, the depth of the connecting groove is less than or equal to the thickness of the connecting sheet.

[0016] As an optional solution to the above-mentioned battery cell structure, the cover plate assembly further includes a fixing ring, and the fixing ring is configured to fix the pole on the top plate.

[0017] As an optional solution to the above-mentioned battery cell structure, the fixing ring includes a fixing section, a transition section and a pressing section, a flange is protruded from the outer periphery of the pole, the fixing section is fixedly connected to the top plate, and the flange is arranged between the pressing section and the top plate.

[0018] As an optional solution to the above-mentioned battery core structure, the fixing ring sleeve is provided with an insulating ring, and the insulating ring covers the transition section, the pressing section and part of the fixing section.

[0019] A battery module comprises a plurality of the battery core structures described above, wherein the plurality of the battery core structures are connected in series or in parallel.

[0020] Beneficial effects of the utility model:

[0021] The utility model provides a battery cell structure and battery module. In this battery cell structure, the bottom of the housing has an opening for inserting the electrode assembly into the housing, and a cover plate is then welded to the housing to seal the opening. The two tabs of the battery cell structure extend through the top plate of the housing and connect to corresponding connection assemblies. This ensures that welding the cover plate does not affect the tab structure and eliminates the need for a current collector, freeing up space for the electrode assembly. This improves internal space utilization and thus increases energy density.

[0022] This battery cell structure can prevent the welding cover plate from affecting the tab structure, thereby ensuring the electrical performance of the battery cell structure and improving the safety of the battery cell structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is an exploded view of the battery cell structure provided by the present utility model;

[0024] Figure 2 This is a top view of the battery core structure provided by the utility model;

[0025] Figure 3 yes Figure 2 Cross-sectional view at AA in the middle;

[0026] Figure 4 yes Figure 3 A partial enlarged view of point B in the middle;

[0027] Figure 5 This is a first structural diagram of the insulating plastic and the shaping plastic provided by the utility model;

[0028] Figure 6 This is a schematic structural diagram of the electrode assembly provided by the present invention;

[0029] Figure 7 This is a second structural diagram of the insulating plastic and the shaping plastic provided by the utility model.

[0030] In the picture:

[0031] 1. Shell; 11. Top plate; 12. Opening; 13. Explosion-proof valve; 14. Liquid injection hole;

[0032] 2. Pole group assembly; 21. Pole group body; 22. Pole ear structure; 221. Connecting portion; 222. Transition portion;

[0033] 3. Connecting assembly; 31. Pole; 32. Connecting piece; 33. Fixing ring; 331. Fixing section; 332. Transition section; 333. Pressing section; 34. Insulating ring; 35. Sealing ring;

[0034] 4. Plastic part; 41. First insulating portion; 42. Second insulating portion; 43. Connecting groove; 44. Shaping surface; 45. Through hole;

[0035] 5. Cover plate assembly;

[0036] 6. Protective film;

[0037] 7. Support plate. DETAILED DESCRIPTION

[0038] The following describes in detail embodiments of the present invention. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention, and should not be construed as limiting the present invention.

[0039] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The terms "first position" and "second position" refer to two different positions.

[0040] Unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," and "fixed" should be interpreted broadly. For example, they may refer to fixed or removable connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components or the interaction between two components. Those skilled in the art will understand the specific meanings of these terms in this utility model based on specific circumstances.

[0041] Unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first feature being in direct contact with the second feature, or may include the first feature being in contact with the second feature through another feature between them instead of being in direct contact. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0042] The technical solution of the present invention will be further described below with reference to the accompanying drawings and through specific implementation methods.

[0043] With the rapid advancement of new energy battery technology, the market penetration of new energy vehicles is gradually increasing, and people are focusing on the range of new energy vehicles. In response to these issues, how to improve the energy density of batteries has become a technical challenge that power battery manufacturers need to continuously overcome.

[0044] As the power source for new energy vehicles, the battery pack directly impacts their range and safety. The battery pack consists of a housing and multiple battery cells, which are arranged in series or parallel. To maximize the volume utilization within the housing and thus the energy density of the battery pack, the cells are typically arranged in square or blade configurations. Both configurations offer the advantage of being able to be tightly packed, ensuring the maximum possible number of cells can be accommodated within the battery pack.

[0045] In this embodiment, the cell structure is described using a square shell cell as an example. To facilitate electrical connection, the positive and negative poles of the cell structure are located on the same side of the cell structure.

[0046] like Figure 1 As shown, in this embodiment, the battery cell structure includes a shell 1, an electrode group assembly 2 and a cover assembly 5. The shell 1 has an opening 12, the electrode group assembly 2 is arranged in the shell 1, and the cover assembly 5 is connected to the shell 1 and blocks the opening 12, so that the shell 1 forms a closed internal space, which can not only prevent the overflow of the electrolyte, but also protect the electrode group assembly 2.

[0047] However, to improve space utilization within the cell structure, the tabs are typically connected to the poles after passing through the cover, eliminating the need for a busbar and preventing the poles from encroaching on the cell structure's internal space. However, the distance between the cover welding location and the tabs is small, and the high temperature, gases, and spatter from welding the cover can affect the tabs, impacting the cell's electrical performance and, ultimately, its safety.

[0048] like Figures 1 to 4 As shown, to solve the above problems, this embodiment provides a battery cell structure in which the housing 1 includes a top plate 11, and the opening 12 is arranged opposite to the top plate 11. Two sets of connecting components 3 are provided on the top plate 11. The electrode group assembly 2 includes an electrode group body 21 and two tab structures 22 provided on the electrode group body 21. The electrode group body 21 includes a plurality of positive electrode sheets and a plurality of negative electrode sheets arranged in a stacked manner, and adjacent positive electrode sheets and negative electrode sheets are separated by a diaphragm to prevent short circuits. The two tab structures 22 are both provided through the top plate 11 and are electrically connected to the corresponding connecting components 3. Specifically, the connecting component 3 includes a pole 31, and the tab structure 22 is electrically connected to the pole 31.

[0049] In this cell structure, the bottom of the housing 1 has an opening 12 for inserting the electrode assembly 2 into the housing 1. The cover plate is then welded to the housing 1 to close the opening 12. The two tabs of the cell structure extend through the top plate 11 of the housing 1 and connect to the corresponding connection assembly 3. This ensures that welding of the cover plate does not affect the tab structure 22 and eliminates the need for a busbar structure, freeing up space for the electrode assembly 2. This improves internal space utilization and thus increases energy density.

[0050] The battery cell structure can avoid the influence of the welding cover plate on the tab structure 22, thereby ensuring the electrical performance of the battery cell structure and improving the safety of the battery cell structure.

[0051] like Figure 1 、 Figure 4 and Figure 5 As shown, the battery cell structure also includes a plastic part 4, which includes a first insulating part 41 and a second insulating part 42 connected to each other. The first insulating part 41 and the second insulating part 42 are respectively located on opposite sides of the top plate 11. The first insulating part 41 is located between the two groups of connecting components 3 and the top plate 11, and the second insulating part 42 is located between the pole group body 21 and the top plate 11.

[0052] The battery cell structure replaces the traditional upper plastic and lower plastic structures with the first insulating part 41 and the second insulating part 42 of the plastic part 4, simplifying the structure. The connected first insulating part 41 and the second insulating part 42 can play a fixing role from both sides of the top plate 11, and also eliminates the structure for fixing the upper plastic and the lower plastic, saving the assembly process, thereby improving efficiency and reducing costs.

[0053] like Figure 2 As shown, the top plate 11 is provided with an explosion-proof valve 13 and a liquid injection hole 14. The explosion-proof valve 13 is used to discharge high-temperature, high-pressure gas generated within the housing 1 in the event of thermal runaway of the battery cell structure, preventing the battery cell structure from exploding and causing serious consequences. The liquid injection hole 14 is used to inject electrolyte into the housing 1 after the cover plate assembly 5 is secured to the housing 1, enabling the battery cell structure to function properly.

[0054] In some embodiments, the top plate 11 is provided with a mounting hole, and the explosion-proof valve 13 is provided in the mounting hole. In some embodiments, in order to reduce costs, the explosion-proof valve 13 can also be formed on the top plate 11 by engraving the line, and the engraved line can be on the inside of the top plate 11 or on the outside of the top plate 11.

[0055] like Figure 1 、 Figure 4 and Figure 6As shown, multiple positive electrode sheets are connected to foils, and the distal ends of the multiple foils are fixed together by ultrasonic welding to form the connection portion 221 of the tab structure 22. The portion of the foils not welded together forms the transition portion 222 of the tab structure 22. Similarly, multiple negative electrode sheets are connected to foils, and the distal ends of the multiple foils are fixed together by ultrasonic welding to form the connection portion 221 of the tab structure 22. The portion of the foils not welded together forms the transition portion 222 of the tab structure 22. Moreover, the dimension of the transition portion 222 in the thickness direction of the electrode assembly 2 gradually decreases as it approaches the connection portion 221.

[0056] However, since the foil material of the transition portion 222 is in a loose and uncontrolled state, it will affect the electrical performance of the battery cell structure and is likely to protrude and touch the housing 1 to cause a short circuit, thereby affecting the safety of the battery cell structure.

[0057] To address the above-mentioned issues, a shaping portion is provided on the side of the second insulating portion 42 facing the electrode assembly 2. The shaping portion has a through-hole 45 formed therein corresponding to the connecting portion 221. The connecting portion 221 is passed through the through-hole 45, and the shaping portion is configured to abut the transition portion 222 to shape the transition portion 222. Because the connecting portion 221 of the electrode tab of the electrode assembly 2 is passed through the through-hole 45 of the plastic part 4, the shaping portion can abut the transition portion 222 to shape the transition portion 222, thereby keeping the shape of the transition portion 222 in a controlled state, preventing the transition portion 222 from bending or protruding and easily contacting the housing 1 to cause a short circuit, thereby ensuring the electrical performance of the battery cell structure and improving the safety of new energy vehicles.

[0058] like Figure 4 and Figure 7 As shown, the shaping portion includes two shaping surfaces 44 spaced apart from each other. The shaping surfaces 44 are configured to press against the surface of the transition portion 222 located on one side of the connecting portion 221. The through hole 45 is located between the two shaping surfaces 44. Generally speaking, the transition portion 222 is symmetrical about the connecting portion 221. Therefore, the two shaping surfaces 44 on both sides of the through hole 45 can respectively shape the portion of the transition portion 222 located on one side of the connecting portion 221, thereby ensuring the shaping effect of the transition portion 222 and preventing the transition portion 222 from bending or bulging.

[0059] In this embodiment, the two shaping surfaces 44 are arranged at an angle, and the distance between the two shaping surfaces 44 gradually decreases as they approach the through hole 45. The inclination direction of the surface of the transition portion 222 is substantially the same as the inclination direction of the shaping surfaces 44, so that the shaping surfaces 44 can shape the transition portion 222 along the direction of the transition portion 222. This allows the transition portion 222 to be shaped while ensuring a small amount of deformation, thereby ensuring a good shaping effect while preventing damage to the transition portion 222 due to excessive deformation.

[0060] It is understood that the relative position between the shaping plastic and the electrode assembly 2 must be relatively accurate to avoid the connection portion 221 having to be bent to be inserted into the through hole 45, resulting in unequal distances between the two shaping surfaces 44 and the transition portion 222, which would affect the shaping effect. To achieve this purpose, the shaping plastic is provided with a snap-fit ​​groove, and the second insulating portion 42 is disposed in the snap-fit ​​groove and has an interference fit with the snap-fit ​​groove.

[0061] like Figure 1 、 Figure 3 and Figure 6 As shown, to increase the battery cell's electrical capacity, the cell structure includes at least two electrode assembly assemblies 2. Each plastic component 4 is provided with a shaping portion and a through-hole 45 corresponding to each electrode assembly 2. Multiple electrode assembly assemblies 2 can increase electrical capacity. Compared to the increased thickness of a single electrode assembly 2, multiple electrode assembly assemblies 2 can reduce the difficulty of lamination, improve product yield, and reduce costs. The plastic component 4 can shape the transition portion 222 of the tab structure 22 of the multiple electrode assembly assemblies 2, thereby ensuring the electrical performance of the cell structure.

[0062] like Figure 3 and Figure 6 As shown, in this embodiment, the battery cell structure includes two sets of electrode group assemblies 2, that is, there are four pole ear structures 22. After the connecting parts 221 of the four pole ear structures 22 pass through the plastic part 4 and the top plate 11, the pole ear structures 22 with the same electrical properties of the two sets of electrode group assemblies 2 are connected to the same connecting assembly 3, that is, the two sets of electrode group assemblies 2 are connected in parallel.

[0063] In this embodiment, a protective film 6 is provided on the outside of the electrode assembly 2. The protective film 6 enables the positive electrode sheet and the negative electrode sheet to be stacked more tightly together, protects the electrode sheets, and prevents the electrode sheets from contacting the housing 1 and causing short circuits or leakage. It is worth noting that if the battery cell structure includes multiple electrode assembly assemblies 2, the protective film 6 can be provided on the outside of each electrode assembly 2, or all electrode assembly assemblies 2 can be provided with the protective film 6.

[0064] In this embodiment, the cell structure further includes a support plate 7, which is disposed within the housing 1 and between the electrode assembly 2 and the cover plate assembly 5. The support plate 7 separates the electrode assembly 2 from the cover plate assembly 5, providing support and protection for the electrode assembly 2 while also preventing the electrode assembly from directly contacting the cover plate assembly 5, causing deformation and impacting electrical performance. It is worth noting that the support plate 7 can be disposed between the electrode assembly 2 and the protective film 6, or between the protective film 6 and the cover plate assembly 5.

[0065] like Figure 1 and Figure 4As shown, the connection assembly 3 also includes a pole 31 and a connecting piece 32. The first insulating portion 41 defines a connecting groove 43, and the connecting piece 32 is disposed within the connecting groove 43. The tab structure 22 passes through the portion of the plastic part 4 and is then bent and electrically connected to the pole 31 via the connecting piece 32. After the connecting portion 221 passes through the plastic part 4, it is bent toward the connecting piece 32 and welded to the connecting piece 32. The pole 31 is then fixed to the top plate 11 to electrically connect the pole 31 and the connecting piece 32. This avoids the problem of the connecting portion 221 being blocked by the pole 31 when directly connecting to the pole 31, making welding difficult. This reduces assembly difficulty and improves product yield.

[0066] It is worth noting that the connecting piece 32 is provided with a protruding connecting post, which can abut against the connecting post when the pole 31 is set on the top plate 11, thereby achieving electrical connection between the top plate 11 and the connecting piece 32. The depth of the connecting groove 43 is less than or equal to the thickness of the connecting piece 32, ensuring that the connecting portion 221 of the tab structure 22 only needs to be bent once to be attached to the connecting piece 32, facilitating welding, greatly reducing the possibility of the connecting portion 221 breaking or affecting electrical performance due to multiple bending.

[0067] like Figure 1 and Figure 4 As shown, the connection assembly 3 further includes a fixing ring 33, which is configured to fix the pole 31 to the top plate 11. It is understandable that since the pole 31 needs to be insulated from the top plate 11, it is not possible to directly weld the pole 31 to the top plate 11, so the fixing ring 33 is required for indirect fixation.

[0068] Specifically, the fixing ring 33 includes a fixing section 331, a transition section 332, and a press-fit section 333. A flange is provided on the outer periphery of the pole 31. The fixing section 331 is fixedly connected to the top plate 11, and the flange is disposed between the press-fit section 333 and the top plate 11. Because the fixing ring 33 is fixedly connected to the top plate 11 via the fixing section 331, the press-fit section 333 can press the flange of the pole 31 onto the top plate 11, ensuring that the pole 31 does not separate from the top plate 11.

[0069] It is worth noting that to ensure the reliability of the connection between the fixing ring 33 and the top plate 11, the fixing ring 33 is welded to the top plate 11, so it is necessary to ensure insulation between the fixing ring 33 and the pole 31. To achieve this purpose, the fixing ring 33 is covered with an insulating ring 34, which can isolate the pole 31 from the fixing ring 33.

[0070] like Figure 4As shown, the insulating ring 34 covers the transition section 332, the pressing section 333, and a portion of the fixed section 331. The insulating ring 34 covers the transition section 332 and the pressing section 333 to prevent the fixed ring 33 from contacting the pole 31. The insulating ring 34 covers a portion of the fixed section 331 so that a portion of the fixed section 331 is exposed for welding to the top plate 11, facilitating operation.

[0071] In this embodiment, the connection assembly 3 also includes a sealing ring 35, which is disposed outside the first insulating portion 41 and between the terminal post 31 and the top plate 11, thereby providing a sealed connection between the terminal post 31 and the top plate 11. The sealing ring 35 seals the gap between the top plate 11 and the terminal post 31 to prevent electrolyte overflow and ensure the safety of the battery cell structure. It is worth noting that while the plastic component 4 can also provide a certain degree of sealing, its relatively high hardness results in poor sealing performance, while the sealing ring 35 can ensure a sufficient sealing effect.

[0072] The above contents are only preferred embodiments of the present invention. For ordinary technicians in this field, according to the concept of the present invention, there may be changes in the specific implementation methods and application scope. The content of this specification should not be understood as limiting the present invention.

Claims

1. A battery cell structure, characterized in that: include: A housing (1), the housing (1) comprising a top plate (11), the housing (1) being provided with an opening (12) relative to the top plate (11), and two groups of connection components (3) being provided on the top plate (11); A plastic part (4) comprising a first insulating portion (41) and a second insulating portion (42) connected to each other, wherein the first insulating portion (41) and the second insulating portion (42) are respectively located on opposite sides of the top plate (11), and the first insulating portion (41) is located between the two groups of the connecting components (3) and the top plate (11); A pole group assembly (2) is arranged in the housing (1), the pole group assembly (2) comprising a pole group body (21) and two pole ear structures (22), the second insulating portion (42) being located between the pole group body (21) and the top plate (11), the two pole ear structures (22) both being passed through the plastic part (4) and electrically connected to the corresponding connecting assembly (3); A cover plate assembly (5) is connected to the housing (1) and blocks the opening (12).

2. The battery cell structure according to claim 1, characterized in that: The pole ear structure (22) comprises a connecting portion (221) and a transition portion (222), the dimension of the transition portion (222) in the thickness direction of the pole group assembly (2) gradually decreases in a direction close to the connecting portion (221), a shaping portion is provided on a side of the second insulating portion (42) facing the pole group assembly (2), a through hole (45) is provided in the shaping portion corresponding to the connecting portion (221), the connecting portion (221) is passed through the through hole (45), and the shaping portion is configured to abut the transition portion (222) to shape the transition portion (222).

3. The battery core structure according to claim 2, characterized in that: The shaping portion comprises two shaping surfaces (44) spaced apart and arranged at an angle, the through hole (45) being located between the two shaping surfaces (44), the distance between the two shaping surfaces (44) gradually decreasing in a direction approaching the through hole (45), and the shaping surface (44) being configured to press against a surface of the transition portion (222) located on one side of the connecting portion (221).

4. The battery core structure according to claim 1, characterized in that: The battery core structure further comprises a support plate (7), wherein the support plate (7) is arranged in the housing (1) and located between the electrode group assembly (2) and the cover plate assembly (5).

5. The battery core structure according to claim 1, characterized in that: The connecting assembly (3) further comprises a pole (31) and a connecting piece (32); the first insulating portion (41) is provided with a connecting groove (43); the connecting piece (32) is arranged in the connecting groove (43); the tab structure (22) passes through a portion of the plastic part (4) and is bent, and then electrically connected to the pole (31) via the connecting piece (32).

6. The battery core structure according to claim 5, characterized in that: The depth of the connecting groove (43) is less than or equal to the thickness of the connecting piece (32).

7. The battery cell structure according to claim 5, characterized in that: The cover plate assembly (5) further comprises a fixing ring (33), wherein the fixing ring (33) is configured to fix the pole (31) on the top plate (11).

8. The battery cell structure according to claim 7, characterized in that: The fixing ring (33) comprises a fixing section (331), a transition section (332) and a pressing section (333); a flange is provided on the outer periphery of the pole (31); the fixing section (331) is fixedly connected to the top plate (11); and the flange is provided between the pressing section (333) and the top plate (11).

9. The battery core structure according to claim 8, characterized in that: The fixing ring (33) is sleeved with an insulating ring (34), and the insulating ring (34) covers the transition section (332), the pressing section (333) and part of the fixing section (331).

10. A battery module, characterized in that: The battery module comprises a plurality of battery cell structures according to any one of claims 1 to 9, and the plurality of battery cell structures are connected in series or in parallel.

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