Cover plate assembly, battery cell and battery pack

Abstract

A cover plate assembly, a battery cell and a battery pack. The cover plate assembly comprises a cover main body, heat conduction sheets and posts; the cover main body has a first surface and a second surface which are oppositely arranged; the heat conduction sheets are in contact with the first surface; each post comprises an adapter plate and a sub-post body, the adapter plates being in contact with the second surface, each sub-post body comprising a conduction column and a connection part, the connection parts abutting against the surfaces of the heat conduction sheets away from the first surface, and each conduction column passing through a heat conduction sheet and the cover main body to be connected to an adapter plate. The provided cover plate assembly enables the heat conduction sheets to effectively dissipate heat of the sub-post bodies, so as to effectively reduce the temperature rising speed of the sub-post bodies; and enables the heat conduction sheets to perform direct heat exchange with the first surface of the cover main body, such that the distance between the heat conduction sheets and the adapter plates is closer, thus effectively reducing the temperature rising speed of the adapter plates.

Description

Cover assembly, battery cells and battery packs

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to the Chinese patent application with application number 202420242498.1 and title “Cover assembly, battery cell and battery pack” filed with the China Patent Office on January 31, 2024, and the Chinese patent application with application number 202420243501.1 and title “Cover assembly, battery cell and battery pack”, the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The present disclosure relates to the field of battery technology, and in particular to a cover plate assembly, a battery cell, and a battery pack. Background Art

[0004] As the popularity of new energy vehicles continues to rise, consumers are becoming increasingly anxious about recharging, especially regarding the efficiency of recharging for long-distance trips. To further improve the efficiency of recharging new energy vehicles and enhance the user experience, fast-charging power batteries have become a mainstream trend in current battery development. Currently, the main limitation to fast charging is the heat generation caused by high-rate charging and discharging. To avoid battery safety incidents, the system will reduce the charging power when the temperature reaches a critical value.

[0005] The battery cell's cover plate assembly consists of a cover body and a terminal. One end of the terminal extends through the cover body and connects to the battery cell's main body. Related technologies use a solution that places the other end of the terminal in direct contact with a cooling plate for heat exchange. This solution dissipates heat only through the top of the terminal, resulting in a small heat dissipation area and poor heat dissipation. This results in inefficient heat dissipation for the battery system, limiting its fast-charging capabilities. Summary of the Invention

[0006] In order to solve the above technical problems or at least partially solve the above technical problems, the present disclosure provides a cover plate assembly, a battery cell and a battery pack.

[0007] The present application discloses a cover plate assembly, comprising:

[0008] The cover body has a first surface and a second surface that are oppositely disposed;

[0009] a heat conducting sheet, provided on the first surface;

[0010] The pole includes a transfer pole piece and a sub-pole body, the transfer pole piece is arranged on the second surface, the sub-pole body includes a guide column and a connecting portion, the connecting portion abuts the surface of the thermal conductive plate away from the first surface, the guide column is connected to the surface where the connecting portion abuts the thermal conductive plate, the guide column extends along the thickness direction of the cover body, and the end of the guide column away from the connecting portion is connected to the transfer pole piece.

[0011] Optionally, an orthographic projection area of ​​the connecting portion on the first surface is smaller than an orthographic projection area of ​​the heat conducting sheet on the first surface.

[0012] Optionally, one of the poles includes a transfer pole piece and two spaced-apart sub-pole bodies, and each of the sub-pole bodies includes the guide column and the connecting portion.

[0013] Optionally, a first limiting groove is formed on the cover body, the heat conducting plate is arranged in the first limiting groove, and the heat conducting plate protrudes from the first limiting groove by a distance of 0-3 mm.

[0014] Optionally, the heat conducting sheet is an elastic sheet, the connecting portion abuts against one end of the heat conducting sheet, and the other end of the heat conducting sheet has a pre-direction force moving toward the first surface.

[0015] Optionally, there are two poles, namely a positive pole and a negative pole, the sub-pole of the positive pole is connected to the end of the corresponding thermal conductive sheet away from the negative pole, and the sub-pole of the negative pole is connected to the end of the corresponding thermal conductive sheet away from the positive pole;

[0016] Alternatively, the sub-pole column of the positive electrode is connected to one end of the corresponding thermal conductive sheet close to the negative electrode, and the sub-pole column of the negative electrode is connected to one end of the corresponding thermal conductive sheet close to the positive electrode.

[0017] Optionally, the adapter electrode is an elastic piece, one end of the adapter electrode is connected to the guide post, and the other end of the adapter electrode away from the guide post has a pre-direction force moving toward the first surface.

[0018] Optionally, the heat conducting sheet and the connecting portion jointly define a cooling gap, a surface of the connecting portion facing the cooling gap is a first heat dissipation surface, and the first heat dissipation surface is a plane.

[0019] Optionally, a first plastic component is provided between the heat conducting sheet and the cover body, and at least a portion of the heat conducting sheet is embedded in the first plastic component in a direction away from the first surface.

[0020] Optionally, a first limiting groove is provided on the cover body, the first plastic part is arranged in the first limiting groove, a second limiting groove is provided on the first plastic part, the opening of the second limiting groove is opened on the surface of the first plastic part away from the first surface, and the heat conducting plate is arranged in the second limiting groove.

[0021] Optionally, the first limiting groove includes a first sunken platform and a second sunken platform, and the orthographic projection of the first sunken platform on the first surface is located within the orthographic projection of the second sunken platform on the first surface;

[0022] The first plastic part includes a first limiting portion, a second limiting portion and a flange portion. The first limiting portion defines the second limiting groove. The second limiting portion is connected to the surface of the first limiting portion facing the second surface and is clamped in the first sinking platform. The flange portion is arranged around the outer peripheral side of the first limiting portion and is clamped in the second sinking platform.

[0023] Optionally, a positioning step is provided on the heat conducting plate, and the positioning step includes a first positioning surface and a second positioning surface, the first positioning surface is parallel to the first surface, the second positioning surface is perpendicular to the first positioning surface, the connecting portion abuts against the first positioning surface, and the connecting portion abuts against the second positioning surface.

[0024] The present application also discloses a battery cell, comprising: a shell, the shell defining a accommodating cavity with an opening; a battery cell body, the battery cell body being arranged in the accommodating cavity and having a pole ear; a cover assembly provided according to the above disclosure, the cover assembly is sealed at the opening of the accommodating cavity, and the adapter electrode is connected to the pole ear.

[0025] The present application also discloses a battery pack, comprising: a plurality of battery cells, wherein the battery cells are battery cells provided according to the above disclosure; a cooling plate, abutting against the surface of the heat conductive plate away from the first surface, and the cooling plate abutting against the connecting portion.

[0026] Optionally, the surface of the connecting portion away from the guide column is a connecting surface, and the battery pack further includes: a tab, which is connected to the connecting surfaces of the poles of opposite polarity of two adjacent battery cells, and part of the cooling plate is clamped between the tab and the heat conducting plate.

[0027] Optionally, the surface of the connecting portion away from the guide column is a connecting surface, and the battery pack further includes: a tab, which is connected to the connecting surfaces of the two connecting portions of the same pole, the cooling plate is clamped between the tab and the thermal conductive plate, and the connecting surfaces of the poles of opposite polarities of two adjacent battery cells are connected through the tab.

[0028] Optionally, the battery cell has two poles, which are respectively a positive pole and a negative pole; the connecting part of the tab and the positive pole is made of the same material; and / or the connecting part of the tab and the negative pole is made of the same material.

[0029] The technical solution provided by the embodiments of the present disclosure has the following advantages over the prior art:

[0030] According to the cover plate assembly provided in the embodiment of the present disclosure, the heat conducting plate is connected to the first surface of the cover body through the sub-pole column, and the connection point between the heat conducting plate and the sub-pole column is located in the middle of the sub-pole column, so that the heat conducting plate can effectively dissipate heat from the sub-pole column, effectively reducing the heating rate of the sub-pole column, and can directly exchange heat with the first surface of the cover body, so that the distance between the heat conducting plate and the adapter plate is closer, effectively reducing the heating rate of the adapter plate.

[0031] According to the battery cell provided in the embodiment of the present disclosure, by setting the above-mentioned cover plate assembly, the heat conductive sheet is stopped against the first surface of the cover body, and the heat conductive sheet is connected to the sub-pole column. In this way, the distance between the heat conductive sheet and the pole ear can be closer, thereby improving the heat dissipation effect of the heat conductive sheet on the pole ear through the sub-pole column and the adapter pole sheet, so that the heat conductive sheet can effectively dissipate heat for the pole column and the cover body. When the battery cell is charged, the temperature rise rate of the pole column during the charging process can be effectively reduced, the fast charging time of the battery cell can be extended, the overall charging time of the battery cell can be shortened, and the charging efficiency of the battery cell can be improved.

[0032] According to the battery pack provided by the embodiment of the present disclosure, by arranging the above-mentioned battery cells and inserting the cooling plate into the cooling notch, the cooling plate can dissipate heat to the pole and the heat conducting plate at the same time, thereby improving the heat exchange efficiency between the cooling plate and the cover plate assembly, improving the heat dissipation effect of the cooling plate on the cover plate assembly, reducing the temperature rise rate of the pole during charging, extending the fast charging time of the battery cells, shortening the overall charging time of the battery cells, and improving the charging efficiency of the battery cells, thereby extending the fast charging time of the battery pack, shortening the overall charging time of the battery pack, and improving the charging efficiency of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0034] In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0035] FIG1 is a schematic structural diagram of a cover plate assembly according to some embodiments of the present disclosure;

[0036] FIG2 is a schematic diagram of the arrangement of cells in a battery pack according to some embodiments of the present disclosure;

[0037] FIG3 is a schematic diagram of a partial structure of a battery pack according to some embodiments of the present disclosure;

[0038] FIG4 is a perspective view of a cover plate assembly according to some embodiments of the present disclosure;

[0039] FIG5 is an exploded view of the cover plate assembly in FIG4 ;

[0040] FIG6 is a perspective view of the heat conducting sheet in FIG4 ;

[0041] FIG7 is a side view of the heat conducting sheet in FIG4 ;

[0042] FIG8 is a perspective view of the transfer electrode in FIG4 ;

[0043] FIG9 is a side view of the transfer electrode in FIG4 ;

[0044] FIG10 is a schematic diagram of the first plastic part in FIG4 ;

[0045] FIG11 is a schematic diagram of a partial structure of a battery pack according to some other embodiments of the present disclosure;

[0046] FIG12 is an exploded view of a portion of the battery pack shown in FIG11 ;

[0047] FIG13 is a perspective view of the battery cell in FIG11 ;

[0048] FIG14 is an exploded view of the battery cell in FIG13 ;

[0049] FIG15 is an exploded view of the cover plate assembly in FIG13 ;

[0050] FIG16 is a perspective view of the transfer electrode in FIG15;

[0051] FIG17 is a perspective view of the first plastic part in FIG15 ;

[0052] FIG18 is a schematic structural diagram of the first plastic part in FIG7 ;

[0053] FIG19 is a perspective view of the sub-pole column in FIG15;

[0054] FIG20 is a perspective view of the cover body in FIG15;

[0055] FIG21 is a schematic diagram of a partial structure of a battery pack according to some further embodiments of the present disclosure.

[0056] Among them, 100, battery cell; 10, cover plate assembly; 1, cover body; 11, first surface; 12, first limiting groove; 121, first sink; 122, second sink; 2, pole; 21, sub-pole column; 211, connecting part; 2111, first heat dissipation surface; 2112, connecting surface; 212, guide column; 22, adapter pole; 3, thermal conductive plate; 31, positioning step; 32, first positioning surface; 33, second positioning surface; 34, cooling notch; 35, pre-bent structure; 4, first plastic part; 41, first limiting part; 411, second limiting groove; 42, second limiting part; 43, flange; 5, second plastic part; 20, shell; 61, shell; 62, battery cell body; 621, pole ear; 63, connecting piece; 300, cooling plate; 400, bar piece. Specific embodiments

[0057] In order to more clearly understand the above-mentioned objectives, features and advantages of the present disclosure, the scheme of the present disclosure will be further described below. It should be noted that the embodiments of the present disclosure and the features therein can be combined with each other in the absence of conflict.

[0058] In the following description, many specific details are set forth to facilitate a full understanding of the present disclosure, but the present disclosure may also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present disclosure, rather than all of the embodiments.

[0059] 1 and 2 , the battery cell 100 includes a shell 20, a battery cell body, and a cover assembly 10. The shell 20 defines a receiving cavity with an opening. The battery cell body is disposed in the receiving cavity, and the battery cell body includes two tabs. The two tabs are spaced apart along the length direction of the cover assembly 10, and the two tabs are a positive tab and a negative tab, respectively.

[0060] The cover plate assembly 10 includes a cover body 1 and two poles 2. The two poles 2 are arranged on the sheet body along the length direction of the cover plate assembly 10, and the two poles 2 correspond one-to-one to the positive electrode tab and the negative electrode tab. The sheet body is sealed at the opening of the accommodating cavity, and the poles 2 are connected to the tabs.

[0061] Referring to Figures 2 and 3, the present application discloses a cover assembly 10, comprising a cover body 1, a heat conducting plate 3, and a terminal 2. The cover body 1 has a first surface 11 and a second surface opposite each other; the heat conducting plate 3 is disposed on the first surface 11; the terminal 2 includes a transfer plate 22 and a sub-terminal body 21, with the transfer plate 22 disposed on the second surface. For example, the transfer plate 22 is used to connect to the tab of the battery cell. For example, the cover assembly 10 further comprises a second plastic component 5, which is sandwiched between the transfer plate 22 and the cover body 1 to ensure insulation between the transfer plate 22 and the cover body 1.

[0062] The sub-pole column 21 includes a guide column 212 and a connecting portion 211. The connecting portion 211 abuts against the surface of the thermal conductive sheet 3 away from the first surface 11. The guide column 212 is connected to the surface where the connecting portion 211 abuts against the thermal conductive sheet 3, and the guide column 212 extends along the thickness direction of the cover body 1. The end of the guide column 212 away from the connecting portion 211 is connected to the transfer plate 22, that is, the guide column 212 passes through the thermal conductive sheet 3 and the cover body 1; for example, when multiple battery cells 100 are arranged in a battery pack, the bar 400 in the battery pack is connected to the end of the connecting portion 211 away from the guide column 212 to converge the multiple battery cells 100 together.

[0063] The orthographic projection area of ​​the connecting portion 211 on the first surface 11 is smaller than the orthographic projection area of ​​the heat conducting plate 3 on the first surface 11 . The gap defined by the heat conducting plate 3 and the connecting portion 211 is a cooling gap 34 , and the projection plane is parallel to the first surface 11 .

[0064] According to the cover plate assembly 10 provided in the embodiment of the present disclosure, the heat conducting sheet 3 is connected to the first surface 11 of the cover body 1 through the sub-pole column 21, and the orthographic projection area of ​​the connecting portion 211 on the first surface 11 is smaller than the orthographic projection area of ​​the heat conducting sheet 3 on the first surface 11. The connection point between the heat conducting sheet 3 and the sub-pole column 21 is located in the middle of the sub-pole column 21, so that the heat conducting sheet 3 can effectively dissipate heat from the sub-pole column 21, effectively reducing the heating rate of the sub-pole column 21, and can directly exchange heat with the first surface 11 of the cover body 1, so that the distance between the heat conducting sheet 3 and the adapter electrode 22 is closer, effectively reducing the heating rate of the adapter electrode 22.

[0065] 5 , according to some embodiments provided in the present disclosure, a first limiting groove 12 is provided on the cover body 1, and the heat conducting plate 3 is provided in the first limiting groove 12; this can reduce the space occupied by the heat conducting plate 3 and the cover body 1 as a whole in the thickness direction of the cover body 1, so that the distance between the connecting portion 211 and the first surface 11 in the thickness direction of the cover body 1 is made smaller, making the overall structure of the battery cell 100 more compact.

[0066] 5 , according to some embodiments provided by the present disclosure, the heat conducting sheet 3 protrudes from the first limiting groove 12, and the distance the heat conducting sheet 3 protrudes from the first limiting groove 12 is 0-3 mm. Optionally, the distance the heat conducting sheet 3 protrudes from the first surface 11 can be 0, 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, 2 mm, 2.1 mm, 2.2 mm, 2.3 mm, 2.4 mm, 2.5 mm, 2.6 mm, 2.7 mm, 2.8 mm, 2.9 mm, or 3 mm.

[0067] When the distance that the heat conducting plate 3 protrudes from the first surface 11 is greater than 0 and less than or equal to 3 mm, part of the heat conducting plate 3 is embedded in the first limiting groove 12. This allows the heat conducting plate 3 to reliably abut against the cooling plate 300, effectively ensuring the heat exchange efficiency between the heat conducting plate 3 and the cooling plate 300.

[0068] When the distance that the heat conducting sheet 3 protrudes from the first surface 11 can be 0, the heat conducting sheet 3 is completely embedded in the first limiting groove 12, and the second heat dissipation surface of the heat conducting sheet 3 is coplanar with the first surface 11. In this way, while ensuring effective contact between the water-cooling plate 300 and the second heat dissipation surface and heat exchange efficiency between the heat conducting sheet 3 and the water-cooling plate 300, the distance between the connecting portion 211 and the first surface 11 in the thickness direction of the cover body 1 is further reduced, making the overall structure of the battery cell 100 more compact.

[0069] 4 to 6 , according to some embodiments provided by the present disclosure, a first plastic part 4 is sandwiched between the heat conducting sheet 3 and the cover body 1, and at least a portion of the heat conducting sheet 3 is embedded in the first plastic part 4 in the direction away from the first surface 11. The first plastic part 4 can seal the gap between the cover body 1 and the pole 2 to ensure the sealing effect of the cover assembly 30. Moreover, the first plastic part 4 can undergo elastic deformation in the thickness direction of the cover body 1, and can absorb part of the assembly error, so that the production precision requirements of the heat conducting sheet 3 and the cooling plate 300 are not too high, thereby reducing the production cost of the heat conducting sheet 3 and the cooling plate 300 and reducing the production cost of the cover assembly 10. When the cooling plate 300 is inserted into the cooling notch 34, the first plastic part 4 provides extrusion force for the heat conducting sheet 3, so that the heat conducting sheet 3 and the cooling plate 300 are in reliable contact, ensuring heat dissipation efficiency.

[0070] For example, the cover plate assembly 30 further includes a first thermally conductive adhesive, which is disposed on the surface of the thermally conductive sheet 3 facing away from the first surface. Optionally, the first thermally conductive adhesive can be a soft sheet or a solid paste. This allows the first thermally conductive adhesive to fill the gap between the thermally conductive sheet 3 and the cooling plate 300, reducing or avoiding the risk of poor heat exchange efficiency between the thermally conductive sheet 3 and the cooling plate 300 due to processing errors or assembly errors, resulting in a small contact surface or even no contact between the thermally conductive sheet 3 and the cooling plate 300. This ensures that a high heat exchange efficiency is reliably maintained between the thermally conductive sheet 3 and the cooling plate 300, thereby improving the reliability of the battery pack.

[0071] 5 , according to some embodiments provided in the present disclosure, a first limiting groove 12 is provided on the cover body 1 , the first plastic part 4 is provided in the first limiting groove 12 , a second limiting groove 411 is provided on the first plastic part 4 , the opening of the second limiting groove 411 is provided on the surface of the first plastic part 4 facing away from the first surface 11 , and the heat conducting sheet 3 is provided in the second limiting groove 411 .

[0072] In this way, the cover body 1 can limit the first plastic part 4 through the first limiting groove 12, so that the first plastic part 4 is reliably positioned relative to the cover body 1. The first plastic part 4 can limit the heat conducting plate 3 through the second limiting groove 411, so that the heat conducting plate 3 is reliably positioned relative to the first plastic part 4, thereby improving the reliability of the cover assembly 10.

[0073] For example, when the pole 2 is a positive pole, the first plastic part 4 is an insulating part. Through the above structure, the positions of the thermal conductive sheet 3, the first plastic part 4 and the cover body 1 are reliably positioned, which can effectively ensure the insulation protection between the connecting part 211 and the cover body, thereby improving the reliability of the battery cell 100.

[0074] 5 , according to some embodiments provided by the present disclosure, the first limiting groove 12 includes a first sunken platform 121 and a second sunken platform 122 , the first sunken platform 121 is located within the projection range of the second sunken platform 122 on the projection plane, and the projection plane is parallel to the first surface 11 ;

[0075] The first plastic component 4 includes a first limiting portion 41, a second limiting portion 42, and a flange portion 43. The first limiting portion 41 defines a second limiting groove 411. The second limiting portion 42 is connected to the surface of the first limiting portion 41 facing the second surface, and the second limiting portion 42 is disposed on the first sinking platform 121. The flange portion 43 is disposed around the outer peripheral side of the first limiting portion 41, and the flange portion 43 is disposed on the second sinking platform 122.

[0076] By providing the flange portion 43, when the second limiting portion 42 is deformed under pressure, the flange portion 43 can play a role of insulation protection, effectively reducing or avoiding the risk of the cooling plate 300 squeezing the second limiting portion 42 and causing insulation failure of the first plastic part 4, further improving the reliability of the first plastic part 4.

[0077] 5-7 , according to some embodiments provided by the present disclosure, a positioning step 31 is provided on the heat conducting plate 3 , and the positioning step 31 includes a first positioning surface 32 and a second positioning surface 33 . The first positioning surface 32 is parallel to the first surface 11 , and the second positioning surface 33 is perpendicular to the first positioning surface 32 . The connecting portion 211 abuts against the first positioning surface 32 and the second positioning surface 33 .

[0078] The second positioning surface 33 of the heat conducting sheet 3 can limit the connection portion 211, ensuring that the connection portion 211 is securely positioned relative to the heat conducting sheet 3. When the cooling plate 300 is inserted into the cooling notch 34, the cooling plate 300 can reliably abut against the first heat dissipation surface 2111 of the connection portion 211, ensuring efficient heat exchange between the cooling plate 300 and the connection portion 211.

[0079] For example, the cover plate assembly 30 further includes a second thermally conductive adhesive, which is disposed on the first heat dissipation surface 2111. Optionally, the second thermally conductive adhesive can be a soft sheet or a solid paste. This allows the second thermally conductive adhesive to fill the gap between the connection portion 211 and the cooling plate 300, reducing or avoiding the risk of poor heat exchange efficiency between the connection portion 211 and the cooling plate 300 due to processing errors or assembly errors resulting in a small contact surface or even no contact between the connection portion 211 and the cooling plate 300. This ensures that a high heat exchange efficiency is reliably maintained between the connection portion 211 and the cooling plate 300, thereby improving the reliability of the battery pack.

[0080] 4 to 7 , according to some embodiments provided by the present disclosure, the heat conducting sheet 3 is an elastic sheet, the connecting portion 211 abuts against one end of the heat conducting sheet 3 in the extension direction, and the end of the heat conducting sheet 3 away from the connecting portion 211 has a pre-force to move toward the first surface 11. For example, the heat conducting sheet 3 may be provided with a pre-bent structure 35 in the middle portion of the heat conducting sheet 3 in the extension direction. When the connecting portion 211 abuts against the heat conducting sheet 3, the connecting portion 211 may squeeze the pre-bent structure 35 to move toward the first surface 11, so that the pre-bent structure 35 has a pre-force to move away from the first surface 11, thereby making the end of the heat conducting sheet 3 away from the connecting portion 211 have a pre-force to move toward the first surface 11. This can prevent the two ends of the heat conducting sheet 3 from warping, ensure that the heat conducting sheet 3 abuts against the first surface 11 reliably, and improve the reliability of the cover assembly 10.

[0081] 4-5 , according to some embodiments provided by the present disclosure, there are two poles 2, and the two poles 2 are respectively a positive pole and a negative pole, the sub-pole body 21 of the positive pole is connected to the end of the corresponding heat conducting plate 3 away from the negative pole, and the sub-pole body 21 of the negative pole is connected to the end of the corresponding heat conducting plate 3 away from the positive pole, that is, the cooling notch 34 of the positive pole is arranged opposite to the cooling notch 34 of the positive pole; in this way, the cooling plate 300 can be clamped between the connection part 211 of the same positive pole and the connection part 211 of the positive pole, so that the cooling plate 300 is passed through the two poles 2 of the same battery cell 100 for heat dissipation, reducing the number of cooling plates 300 set, and making the overall structure of the battery pack simpler.

[0082] According to some embodiments provided by the present disclosure, the sub-pole body 21 of the positive electrode column is connected to the end of the corresponding heat conductive sheet 3 close to the negative electrode column, and the sub-pole body 21 of the negative electrode column is connected to the end of the corresponding heat conductive sheet 3 close to the positive electrode column, that is, the cooling notch 34 of the positive electrode column is arranged opposite to the cooling notch 34 of the positive electrode column. In this way, the cooling plate 300 for cooling the positive electrode column can be arranged on the side of the positive electrode column away from the positive electrode column, avoiding the explosion-proof valve between the positive electrode column and the positive electrode column, so that the cooling plate 300 for cooling the positive electrode column is arranged on the side of the positive electrode column away from the positive electrode column, avoiding the explosion-proof valve between the positive electrode column and the positive electrode column, avoiding the cooling plate 300 from interfering with the explosion-proof valve and causing the explosion-proof valve of the battery cell 100 to fail, thereby improving the reliability of the battery cell 100.

[0083] 1-3 , according to some embodiments provided by the present disclosure, there are two poles 2, and the two poles 2 are respectively a positive pole and a positive pole, and the cooling notch 34 of the positive pole and the cooling notch 34 of the positive pole are opened in the same direction; for example, the connection parts 211 of the two poles 2 are both stopped at one end of the thermal conductive plate 3 in the thickness direction of the battery cell 100, and the cooling notch 34 of the positive pole and the cooling notch 34 of the positive pole are both opened in the width direction of the battery cell 100.

[0084] When assembling the battery pack, two adjacent battery cells 100 can be arranged symmetrically so that the positive pole of one of the two adjacent battery cells 100 and the negative pole of the other are arranged relative to each other in the thickness direction of the battery cell 100. This makes it convenient to use the bar 400 to connect the positive pole and the negative pole of the two adjacent battery cells 100 together, so that one cooling plate 300 can simultaneously perform heat exchange on all poles on the two battery cells 100, which can reduce the number of cooling plates 300 set, improve the heat exchange efficiency, and make the overall structure of the battery pack simpler.

[0085] 4-7 , according to some embodiments provided by the present disclosure, the thermal conductive sheet 3 is an elastic sheet. In the extension direction of the thermal conductive sheet 3, the connecting portion 211 abuts against the middle of the thermal conductive sheet 3. The cooling notches 34 are located on either side of the connecting portion 211. Both ends of the thermal conductive sheet 3, away from the connecting portion 211, are preloaded with a force that forces the sheet 3 toward the first surface 11. This prevents warping of the ends of the thermal conductive sheet 3, ensures a secure abutment between the thermal conductive sheet 3 and the first surface 11, and improves the reliability of the cover assembly 10.

[0086] Moreover, when the battery cell 100 provided with the above-mentioned cover plate assembly 10 is placed in the battery pack, cooling plates 300 can be passed through the cooling gaps 34 on both sides of the guide column 212 to increase the heat exchange area between the pole 2 and the cooling plate 300, improve the heat dissipation effect of the pole 2, reduce the heating rate of the pole 2 during charging, extend the fast charging time of the battery cell 100, shorten the overall charging time of the battery cell 100, and improve the charging efficiency of the battery cell 100.

[0087] 4, 5, 8, and 9, according to some embodiments provided by the present disclosure, the guide post 212 is connected to one end of the adapter electrode 22 in the extension direction. The adapter electrode 22 is an elastic sheet, and the end of the adapter electrode 22 away from the guide post 212 has a pre-directed force to move toward the first surface 11. For example, the adapter electrode 22 can be provided with a pre-bent structure 35 in the middle portion of its extension direction. When the connecting portion 211 abuts against the adapter electrode 22, the connecting portion 211 can squeeze the pre-bent structure 35 toward the second surface, so that the pre-bent structure 35 has a pre-directed force to move away from the second surface, thereby causing the end of the adapter electrode 22 away from the connecting portion 211 to have a pre-directed force to move toward the second surface. This can prevent the two ends of the adapter electrode 22 from warping, so that the adapter electrode 22 can be reliably stopped against the second surface, and prevent the ends of the adapter electrode 22 from warping and interfering with the core body and causing damage to the core body, thereby improving the reliability of the cover assembly 10 and the reliability of the battery cell 100.

[0088] 4 and 5 , according to some embodiments of the present disclosure, the surface of the connecting portion 211 facing the cooling notch 34 is a first heat dissipation surface 2111, which is a flat surface. When the cooling plate 300 is inserted into the cooling notch 34, this increases the contact area between the connecting portion 211 and the cooling plate 300, improving the heat dissipation efficiency between the cooling plate 300 and the first heat dissipation surface 2111, and enhancing the cooling effect of the cooling plate 300 on the pole 2.

[0089] 1-3 , the present application further discloses a battery cell 100, comprising: a shell 20, the shell 20 defining a receiving cavity with an opening; a battery cell body, the battery cell body being disposed in the receiving cavity and having a pole ear; and a cover plate assembly 10 provided in accordance with the above disclosure, the cover plate assembly 10 being sealed at the opening of the receiving cavity, and the adapter electrode 22 being connected to the pole ear.

[0090] According to the battery cell 100 provided in the embodiment of the present disclosure, by setting the above-mentioned cover plate assembly 10, the heat conductive sheet 3 is stopped against the first surface 11 of the cover body 1, and the heat conductive sheet 3 is connected to the sub-pole column 21, so that the heat conductive sheet 3 can effectively dissipate heat from the pole column 2 and the cover body 1. When the battery cell 100 is charged, the heating rate of the pole column 2 during the charging process can be effectively reduced, the fast charging time of the battery cell 100 can be extended, the overall charging time of the battery cell 100 can be shortened, and the charging efficiency of the battery cell 100 can be improved.

[0091] This application also discloses a battery pack, comprising: a plurality of battery cells 100 and a cooling plate 300, wherein the battery cells 100 are provided according to the above disclosure; the cooling plate 300 abuts against the surface of the thermal conductive sheet 3 away from the first surface 11, and the cooling plate 300 abuts against the connecting portion 211, that is, the cooling plate 300 abuts against the first heat dissipation surface 2111 of the connecting portion 211. For example, the cooling plate 300 may be a liquid cooling plate; specifically, the cooling plate 300 may be a water cooling plate or an oil cooling plate.

[0092] According to the battery pack provided by the embodiment of the present disclosure, by setting the above-mentioned battery cell 100 and inserting the cooling plate 300 into the cooling gap 34, the cooling plate 300 can dissipate heat for the pole 2 and the heat conducting plate 3 at the same time, thereby improving the heat exchange efficiency between the cooling plate 300 and the cover plate assembly 10, improving the heat dissipation effect of the cooling plate 300 on the cover plate assembly 10, reducing the heating rate of the pole 2 during charging, extending the fast charging time of the battery cell 100, shortening the overall charging time of the battery cell 100, and improving the charging efficiency of the battery cell 100, thereby extending the fast charging time of the battery pack, shortening the overall charging time of the battery pack, and improving the charging efficiency of the battery pack.

[0093] 1-3 , according to some embodiments provided by the present disclosure, the surface of the connecting portion 211 away from the guide post 212 is a connecting surface 2112 , and the battery pack further includes: a tab 400 , which is connected to the connecting surface 2112 of the poles 2 of opposite polarity of two adjacent battery cells 100 , and a portion of the cooling plate 300 is sandwiched between the tab 400 and the thermal conductive sheet 3 . For example, in the height direction of the battery cell, the cooling plate 300 does not protrude from the connecting portion 211 , so that the battery pack can be made smaller in the height direction of the battery cell 300 , making the battery pack as a whole more compact. For example, the tab 400 can abut against a side surface of the cooling plate 300 away from the cover body 1 to improve the heat exchange efficiency between the tab 400 and the cooling plate 300 and improve the cooling effect of the cooling plate 300 on the tab 400 .

[0094] In this way, the cooling plate 300 can dissipate heat from the bar 400, reduce the temperature rise rate of the bar 400 during the charging process of the battery pack, avoid the local temperature of the bar 400 being too high, and cause the fast charging mode of the battery cell 100 to stop, extend the fast charging time of the battery cell 100, shorten the overall charging time of the battery cell 100, and improve the charging efficiency of the battery cell 100.

[0095] 1-4 , according to some embodiments provided by the present disclosure, a battery cell 100 has two electrodes 2, one of which is a positive electrode and the other is a positive electrode. The tab 400 is made of the same material as the connection portion 211 of the positive electrode. For example, when the connection portion 211 of the positive electrode is copper, the tab 400 is a copper tab; when the connection portion 211 of the positive electrode is aluminum, the tab 400 is an aluminum tab. This allows the tab 400 and the connection portion 211 of the positive electrode to be welded together using the same material, reducing the difficulty of welding the tab 400 to the connection portion 211 of the positive electrode, and lowering the production cost of the battery pack.

[0096] For example, the connection portion 211 and the guide post 212 of the positive electrode post are both made of aluminum. The connection portion 211 of the positive electrode post is made of aluminum, and the guide post 212 of the positive electrode post is made of copper. Optionally, the connection portion 211 and the guide post 212 of the positive electrode post can be connected together by screws. Optionally, the connection portion 211 and the guide post 212 of the positive electrode post can also be connected together by interference fit. This can promote the charging and discharging of the battery cell 100, ensure the overcurrent capacity of the bar 400, reduce the cost of the bar 400, reduce the weight of the bar 400, reduce the weight of the battery pack, and improve the overall performance of the battery pack.

[0097] In other embodiments of the present application, referring to Figure 14, the battery cell 100 includes a shell 61, a battery cell body 62, a connecting piece 63 and a cover assembly 10, the shell 61 defines a accommodating cavity with an opening, the battery cell body 62 is arranged in the accommodating cavity, and the battery cell body 62 includes two pole ears 621, the two pole ears 621 are spaced apart along the length direction of the cover assembly 10, and the two pole ears 621 are respectively a positive pole ear 621 and a negative pole ear 621.

[0098] The cover plate assembly 10 includes a cover body 1 and two poles 2. The two poles 2 are arranged on the cover body 1 along the length direction of the cover plate assembly 10, and the two poles 2 correspond one-to-one to the positive pole tab 621 and the negative pole tab 621. The cover body 1 is sealed at the opening of the accommodating cavity, and the connecting piece 63 connects the pole 2 and the pole tab 621.

[0099] 13-15 , the present application discloses a cover plate assembly 10, comprising a cover body 1, a heat conducting plate 3 and a pole 2, wherein the cover body 1 has a first surface 11 and a second surface arranged opposite to each other; for example, when the cover plate assembly 10 is arranged in the battery cell 100, the surface of the cover body 1 facing the accommodating cavity is the first surface 11, and the surface of the cover body 1 facing away from the accommodating cavity is the second surface.

[0100] The thermally conductive sheet 3 is provided on the first surface 11; for example, the thermally conductive sheet 3 is used to connect to the battery pack's cooling plate 300 to dissipate heat from the electrode 2 and the cover body 1. Referring to Figure 19 , the electrode 2 includes a transition electrode 22 and two spaced-apart sub-electrode columns 21. The transition electrode 22 is provided on the second surface, for example, for connecting to the tab 621 of the battery cell body 62. For example, the two sub-electrode columns 21 can be spaced apart along the length of the battery cell 100 or along the width of the battery cell 100. Each sub-pole column 21 includes a guide post 212 and a connecting portion 211. The connecting portion 211 abuts the surface of the thermal conductive sheet 3 away from the first surface 11. The guide post 212 is connected to the surface where the connecting portion 211 abuts the thermal conductive sheet 3. The guide post 212 extends along the thickness direction of the cover body 1. The end of the guide post 212 away from the connecting portion 211 is connected to the adapter plate 22. In other words, the guide post 212 penetrates the thermal conductive sheet 3 and the cover body 1. The two connecting portions 211 and the thermal conductive sheet 3 together define a cooling gap 23. When assembling the battery pack, the cooling plate 300 can be inserted into the cooling gap 23 so that the cooling plate 300 can simultaneously exchange heat with the connecting portion 211 and the thermal conductive sheet, thereby improving heat exchange efficiency.

[0101] For example, referring to Figures 11-15 , the cooling notch 23 extends parallel to the spacing between two poles 2 on the same cover body 1. For example, when two poles 2 are spaced apart on the cover body 1 along the length of the battery cell 100, the cooling notch 23 extends parallel to the width of the battery cell 100. When the battery cell 100 is assembled into the battery pack, the cooling plate 300 can be positioned within the cooling notches 23 of the two poles 2 on the same battery cell 100. This allows both poles 2 of the same battery cell 100 to dissipate heat through the same cooling plate 300, reducing the number of cooling plates 300 required and simplifying the overall structure of the battery pack.

[0102] For example, referring to FIG21 , the extension direction of the cooling notch 23 is parallel to the spacing direction between the two electrodes 2 on the same cover body 1. For example, when the two electrodes 2 are spaced apart on the cover body 1 along the length of the battery cell 100, the extension direction of the cooling notch 23 is parallel to the width direction of the battery cell 100. When the two cooling plates 300 are inserted into the two cooling notches 23, the cooling plates 300 can avoid the explosion-proof valve between the positive electrode and the negative electrode 2, preventing the cooling plates 300 from interfering with the explosion-proof valve and causing the explosion-proof valve of the battery cell 100 to fail, thereby improving the reliability of the battery cell 100.

[0103] According to the cover plate assembly 10 provided in the embodiment of the present disclosure, by setting the pole 2 to include two spaced-apart sub-pole columns 21, the central area of ​​the pole 2 can be left empty, the area of ​​heat dissipation between the pole 2 and the air is increased, and the heat dissipation efficiency of the pole 2 is improved; by setting a heat conductive sheet 3 on the first surface 11, by setting a heat conductive sheet 3 on the first surface 11, and fixing the heat conductive sheet 3 on the first surface 11 by using two sub-pole columns 21, the connection point between the heat conductive sheet 3 and the sub-pole column 21 is located in the middle of the sub-pole column 21, the heat conductive sheet 3 can effectively dissipate heat for the sub-pole column 21, effectively reduce the heating rate of the sub-pole column 21, and can directly exchange heat with the first surface 11 of the cover body 1, so that the distance between the heat conductive sheet 3 and the adapter pole 22 is closer, effectively reducing the heating rate of the adapter pole 22.

[0104] 14 and 15 , according to some embodiments provided by the present disclosure, the cover assembly 10 further includes a second plastic part 5 , which is sandwiched between the adapter electrode 22 and the cover body 1 . This ensures insulation between the adapter electrode 22 and the cover body 1 and improves the reliability of the cover assembly 10 .

[0105] 15 , according to some embodiments provided in the present disclosure, a first limiting groove 12 is provided on the cover body 1, and the heat conducting plate 3 is provided in the first limiting groove 12; this can reduce the space occupied by the heat conducting plate 3 and the cover body 1 as a whole in the thickness direction of the cover body 1, so that the distance between the connecting portion 211 and the first surface 11 in the thickness direction of the cover body 1 is made smaller, making the overall structure of the battery cell 100 more compact.

[0106] 15 , according to some embodiments provided by the present disclosure, the heat conducting sheet 3 protrudes from the first limiting groove 12, and the distance the heat conducting sheet 3 protrudes from the first limiting groove 12 is 0-3 mm. Optionally, the distance the heat conducting sheet 3 protrudes from the first surface 11 can be 0, 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, 2 mm, 2.1 mm, 2.2 mm, 2.3 mm, 2.4 mm, 2.5 mm, 2.6 mm, 2.7 mm, 2.8 mm, 2.9 mm, or 3 mm.

[0107] When the distance that the heat conducting plate 3 protrudes from the first surface 11 is greater than 0 and less than or equal to 3 mm, part of the heat conducting plate 3 is embedded in the first limiting groove 12. This allows the heat conducting plate 3 to reliably abut against the cooling plate 300, effectively ensuring the heat exchange efficiency between the heat conducting plate 3 and the cooling plate 300.

[0108] When the distance that the heat conducting sheet 3 protrudes from the first surface 11 can be 0, the heat conducting sheet 3 is completely embedded in the first limiting groove 12, and the second heat dissipation surface of the heat conducting sheet 3 is coplanar with the first surface 11. In this way, while ensuring effective contact between the water-cooling plate 300 and the second heat dissipation surface and heat exchange efficiency between the heat conducting sheet 3 and the water-cooling plate 300, the distance between the connecting portion 211 and the first surface 11 in the thickness direction of the cover body 1 is further reduced, making the overall structure of the battery cell 100 more compact.

[0109] 13 to 17 , according to some embodiments provided by the present disclosure, a first plastic part 4 is sandwiched between the heat conducting sheet 3 and the cover body 1, and at least a portion of the heat conducting sheet 3 is embedded in the first plastic part 4 in the direction away from the first surface 11. The first plastic part 4 can seal the gap between the cover body 1 and the pole 2 to ensure the sealing effect of the cover assembly 30. Moreover, the first plastic part 4 can undergo elastic deformation in the thickness direction of the cover body 1, and can absorb part of the assembly error, so that the production precision requirements of the heat conducting sheet 3 and the cooling plate 300 are not too high, thereby reducing the production cost of the heat conducting sheet 3 and the cooling plate 300 and reducing the production cost of the cover assembly 10. When the cooling plate 300 is inserted into the cooling notch 23, the first plastic part 4 provides extrusion force for the heat conducting sheet 3, so that the heat conducting sheet 3 and the cooling plate 300 are in reliable contact, ensuring heat dissipation efficiency.

[0110] 17 , 18 and 20 , according to some embodiments provided in the present disclosure, a first limiting groove 12 is provided on the cover body 1 , the first plastic part 4 is clamped in the first limiting groove 12 , a second limiting groove 411 is provided on the first plastic part 4 , an opening of the second limiting groove 411 is provided on the surface of the first plastic part 4 facing away from the first surface 11 , and the heat conducting sheet 3 is clamped in the second limiting groove 411 .

[0111] In this way, the cover body 1 can limit the first plastic part 4 through the first limiting groove 12, so that the first plastic part 4 is reliably positioned relative to the cover body 1. The first plastic part 4 can limit the heat conducting plate 3 through the second limiting groove 411, so that the heat conducting plate 3 is reliably positioned relative to the first plastic part 4, thereby improving the reliability of the cover assembly 10.

[0112] For example, when the pole 2 is a positive pole, the first plastic part 4 is an insulating part. Through the above structure, the positions of the thermal conductive sheet 3, the first plastic part 4 and the cover body 1 are reliably positioned, which can effectively ensure the insulation protection between the connecting part 211 and the cover body, thereby improving the reliability of the battery cell 100.

[0113] 17 , 18 and 20 , according to some embodiments provided by the present disclosure, the first limiting groove 12 includes a first sink 121 and a second sink 122, the first sink 121 is located within the projection range of the second sink 122 on the projection plane, and the projection plane is parallel to the first surface 11; the first plastic part 4 includes a first limiting portion 41, a second limiting portion 42 and a flange portion 43, the first limiting portion 41 defines a second limiting groove 411, the second limiting portion 42 is connected to the surface of the first limiting portion 41 facing the second surface and is clamped in the first sink 121, and the flange portion 43 is surrounded by the outer peripheral side of the first limiting portion 41 and is clamped in the second sink 122.

[0114] By providing the flange portion 43, when the second limiting portion 42 is deformed under pressure, the flange portion 43 can play a role of insulation protection, effectively reducing or avoiding the risk of the cooling plate 300 squeezing the second limiting portion 42 and causing insulation failure of the first plastic part 4, further improving the reliability of the first plastic part 4.

[0115] 15 and 16 , according to some embodiments provided in the present disclosure, a positioning step 31 is provided on the heat conducting plate 3. The positioning step 31 includes a first positioning surface 32 and a second positioning surface 33. The first positioning surface 32 is parallel to the first surface 11, and the second positioning surface 33 is perpendicular to the first positioning surface 32. The connecting portion 211 abuts against the first positioning surface 32 and the second positioning surface 33.

[0116] The heat conducting plate 3 can limit the connection portion 211 via the second positioning surface 33, ensuring that the connection portion 211 is securely positioned relative to the heat conducting plate 3. When the cooling plate 300 is inserted into the cooling notch 23, the cooling plate 300 can reliably abut against the first heat dissipation surface 2111 of the connection portion 211, ensuring efficient heat exchange between the cooling plate 300 and the connection portion 211.

[0117] For example, the cover plate assembly 30 further includes a first thermally conductive adhesive, which is disposed on the surface of the thermally conductive sheet 3 facing away from the first surface. Optionally, the first thermally conductive adhesive can be a soft sheet or a solid paste. This allows the first thermally conductive adhesive to fill the gap between the thermally conductive sheet 3 and the cooling plate 300, reducing or avoiding the risk of poor heat exchange efficiency between the thermally conductive sheet 3 and the cooling plate 300 due to processing errors or assembly errors, resulting in a small contact surface or even no contact between the thermally conductive sheet 3 and the cooling plate 300. This ensures that a high heat exchange efficiency is reliably maintained between the thermally conductive sheet 3 and the cooling plate 300, thereby improving the reliability of the battery pack.

[0118] 13-15 , according to some embodiments of the present disclosure, the surface of the connecting portion 211 facing the cooling notch 23 is a first heat dissipation surface 2111, which is a flat surface. When the cooling plate 300 is inserted into the cooling notch 23, this increases the contact area between the connecting portion 211 and the cooling plate 300, improving the heat dissipation efficiency between the cooling plate 300 and the first heat dissipation surface 2111, and enhancing the cooling effect of the cooling plate 300 on the pole 2.

[0119] For example, the cover plate assembly 30 further includes a second thermally conductive adhesive, which is disposed on the first heat dissipation surface 2111. Optionally, the second thermally conductive adhesive can be a soft sheet or a solid paste. This allows the second thermally conductive adhesive to fill the gap between the connection portion 211 and the cooling plate 300, reducing or avoiding the risk of poor heat exchange efficiency between the connection portion 211 and the cooling plate 300 due to processing errors or assembly errors resulting in a small contact surface or even no contact between the connection portion 211 and the cooling plate 300. This ensures that a high heat exchange efficiency is reliably maintained between the connection portion 211 and the cooling plate 300, thereby improving the reliability of the battery pack.

[0120] 11-15 and 21 , the present application further discloses a battery cell 100 , comprising: a shell 61 , the shell 61 defining a receiving cavity with an opening; a battery cell body 62 , the battery cell body 62 being disposed in the receiving cavity and having a pole ear 621 ; and a cover plate assembly 10 according to the above disclosure, the cover plate assembly 10 is sealed at the opening of the receiving cavity, and the adapter electrode 22 is connected to the pole ear 621 .

[0121] According to the battery cell 100 provided in the embodiment of the present disclosure, by providing the above-mentioned cover plate assembly 10, the central area of ​​the pole 2 can be vacated, the area of ​​heat dissipation between the pole 2 and the air is increased, and the heat dissipation efficiency of the pole 2 is improved; by providing a heat conducting plate 3 on the first surface 11, and using two sub-pole columns 21 to fix the heat conducting plate 3 on the first surface 11, the connection point between the heat conducting plate 3 and the sub-pole column 21 is located in the middle of the sub-pole column 21, the heat conducting plate 3 can effectively dissipate heat for the sub-pole column 21, effectively reduce the heating rate of the sub-pole column 21, and can directly exchange heat with the first surface 11 of the cover body 1, so that the distance between the heat conducting plate 3 and the adapter plate 22 is closer, effectively reducing the heating rate of the adapter plate 22; when the battery cell 100 is charged, the heating rate of the pole 2 during the charging process can be effectively reduced, the fast charging time of the battery cell 100 can be extended, the overall charging time of the battery cell 100 can be shortened, and the charging efficiency of the battery cell 100 can be improved.

[0122] 11-15 and 21 , the present application further discloses a battery pack, comprising: a plurality of battery cells 100, wherein the battery cells 100 are provided according to the above disclosure; and a cooling plate 300, which is disposed between two sub-pole columns 21 of the pole column 2. For example, the cooling plate 300 may be a liquid cooling plate; specifically, the cooling plate 300 may be a water cooling plate or an oil cooling plate.

[0123] For example, a thermally conductive adhesive is applied between the thermally conductive sheet 3 and the cooling plate 300. The adhesive can be a soft sheet or a solid paste. The thermally conductive adhesive can fill the gap between the thermally conductive sheet 3 and the cooling plate 300, reducing or avoiding the risk of poor heat exchange efficiency between the thermally conductive sheet 3 and the cooling plate 300 due to machining or assembly errors, resulting in a small contact surface or even no contact. This ensures that the thermally conductive sheet 3 and the cooling plate 300 maintain a high heat exchange efficiency, thereby improving the reliability of the battery pack.

[0124] For example, thermal conductive glue is coated between the connection part 211 and the cooling plate 300; the thermal conductive glue can fill the gap between the connection part 211 and the cooling plate 300, reducing or avoiding the risk of a small contact surface or even no contact between the connection part 211 and the cooling plate 300 due to processing errors or assembly errors, which ultimately leads to poor heat exchange efficiency between the connection part 211 and the cooling plate 300, ensuring that a high heat exchange efficiency is reliably maintained between the connection part 211 and the cooling plate 300, thereby improving the reliability of the battery pack.

[0125] According to the battery pack provided by the embodiment of the present disclosure, by setting the above-mentioned battery cell 100 and passing the cooling plate 300 between the two sub-pole columns 21, the cooling plate 300 can simultaneously contact the heat conducting plate 3 and the two sub-pole columns 21, thereby improving the heat exchange efficiency between the cooling plate 300 and the pole column 2 and the cover plate assembly 10, improving the heat dissipation effect of the cooling plate 300 on the cover plate assembly 10, reducing the heating rate of the pole column 2 during charging, extending the fast charging time of the battery cell 100, shortening the overall charging time of the battery cell 100, and improving the charging efficiency of the battery cell 100, thereby extending the fast charging time of the battery pack, shortening the overall charging time of the battery pack, and improving the charging efficiency of the battery pack.

[0126] 13-15 , according to some embodiments provided by the present disclosure, the surface of the connecting portion 211 away from the guide post 212 is a connecting surface 2112. The battery pack further includes a tab 400, which is connected to the connecting surfaces 2112 of two connecting portions 211 of the same terminal 2. The cooling plate 300 is sandwiched between the tab 400 and the thermal conductive sheet 3. The connecting surfaces 2112 of the oppositely polar terminals 2 of two adjacent battery cells 100 are connected via the tab 400. For example, the tab 400 may abut against a side surface of the cooling plate 300 away from the cover body 1 to improve the heat exchange efficiency between the tab 400 and the cooling plate 300, thereby enhancing the cooling effect of the cooling plate 300 on the tab 400.

[0127] In this way, the cooling plate 300 can dissipate heat from the bar 400, reduce the temperature rise rate of the bar 400 during the charging process of the battery pack, avoid the local temperature of the bar 400 being too high, and cause the fast charging mode of the battery cell 100 to stop, extend the fast charging time of the battery cell 100, shorten the overall charging time of the battery cell 100, and improve the charging efficiency of the battery cell 100.

[0128] According to some embodiments provided by the present disclosure, the battery cell 100 has two electrodes 2, one positive electrode and one negative electrode. The tab 400 is made of the same material as the connection portion 211 of the positive electrode. For example, when the connection portion 211 of the positive electrode is copper, the tab 400 is a copper sheet; when the connection portion 211 of the positive electrode is aluminum, the tab 400 is an aluminum sheet. This ensures that the tab 400 and the connection portion 211 of the positive electrode are welded together using the same material, reducing the difficulty of welding the tab 400 to the connection portion 211 of the positive electrode, thereby reducing the production cost of the battery pack.

[0129] According to some embodiments provided by the present disclosure, the battery cell 100 has two poles 2, which are respectively a positive pole and a negative pole; the tab 400 is made of the same material as the connection portion 211 of the negative pole. For example, when the connection portion 211 of the negative pole is copper, the tab 400 is a copper sheet; when the connection portion 211 of the negative pole is aluminum, the tab 400 is an aluminum sheet. This allows the tab 400 to be welded to the connection portion 211 of the negative pole using the same material, which can reduce the difficulty of the process of connecting the tab 400 to the connection portion 211 of the negative pole by welding, thereby reducing the production cost of the battery pack.

[0130] For example, the connection portion 211 and the guide post 212 of the positive electrode post are both made of aluminum, the connection portion 211 of the negative electrode post is made of aluminum, and the guide post 212 of the negative electrode post is made of copper; optionally, the connection portion 211 and the guide post 212 of the negative electrode post can be connected together by threads. Optionally, the connection portion 211 and the guide post 212 of the negative electrode post can also be connected together by an interference fit. This can promote the charging and discharging of the battery cell 100, ensure the current capacity of the tab 400, reduce the cost of the tab 400, reduce the weight of the tab 400, reduce the weight of the battery pack, and improve the overall performance of the battery pack.

[0131] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0132] The foregoing description is intended only to provide specific embodiments of the present disclosure, intended to enable those skilled in the art to understand and implement the present disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present disclosure. Therefore, the present disclosure is not intended to be limited to the embodiments described herein, but rather to be construed in the broadest manner consistent with the principles and novel features disclosed herein.

Claims

1. A cover plate assembly, characterized in that: include: The cover body has a first surface and a second surface that are oppositely disposed; a heat conducting sheet, provided on the first surface; The pole includes a transfer pole piece and a sub-pole body, the transfer pole piece is arranged on the second surface, the sub-pole body includes a guide column and a connecting portion, the connecting portion abuts the surface of the thermal conductive plate away from the first surface, the guide column is connected to the surface where the connecting portion abuts the thermal conductive plate, the guide column extends along the thickness direction of the cover body, and the end of the guide column away from the connecting portion is connected to the transfer pole piece.

2. The cover plate assembly according to claim 1, wherein: An orthographic projection area of the connecting portion on the first surface is smaller than an orthographic projection area of the heat conducting sheet on the first surface.

3. The cover plate assembly according to claim 1, wherein: One of the poles includes a transfer pole piece and two spaced-apart sub-pole bodies, and each of the sub-pole bodies includes the guide column and the connecting portion.

4. The cover plate assembly according to any one of claims 1 to 3, characterized in that: A first limiting groove is formed on the cover body, the heat conducting plate is arranged in the first limiting groove, and the heat conducting plate protrudes from the first limiting groove by a distance of 0-3 mm.

5. The cover plate assembly according to any one of claims 1 to 4, characterized in that: The heat conducting sheet is an elastic sheet, the connecting portion abuts against one end of the heat conducting sheet, and the other end of the heat conducting sheet has a pre-direction force moving toward the first surface.

6. The cover plate assembly according to any one of claims 1 to 5, characterized in that: There are two poles, namely a positive pole and a negative pole, the sub-pole of the positive pole is connected to the end of the corresponding thermal conductive sheet away from the negative pole, and the sub-pole of the negative pole is connected to the end of the corresponding thermal conductive sheet away from the positive pole; Alternatively, the sub-pole column of the positive electrode is connected to one end of the corresponding thermal conductive sheet close to the negative electrode, and the sub-pole column of the negative electrode is connected to one end of the corresponding thermal conductive sheet close to the positive electrode.

7. The cover plate assembly according to any one of claims 1 to 6, characterized in that: The transfer electrode is an elastic piece, one end of the transfer electrode is connected to the guide post, and the other end of the transfer electrode away from the guide post has a pre-direction force moving toward the first surface.

8. The cover plate assembly according to any one of claims 1 to 7, characterized in that: The heat conducting sheet and the connecting portion jointly define a cooling gap, and a surface of the connecting portion facing the cooling gap is a first heat dissipation surface, which is a plane.

9. The cover plate assembly according to any one of claims 1 to 8, characterized in that: A first plastic component is provided between the heat conducting sheet and the cover body. In a direction away from the first surface, at least a portion of the heat conducting sheet is embedded in the first plastic component.

10. The cover plate assembly according to claim 9, wherein: A first limiting groove is provided on the cover body, the first plastic part is provided in the first limiting groove, a second limiting groove is provided on the first plastic part, an opening of the second limiting groove is provided on the surface of the first plastic part away from the first surface, and the heat conducting sheet is provided in the second limiting groove.

11. The cover plate assembly according to any one of claims 10, wherein: The first limiting groove includes a first sunken platform and a second sunken platform, and the orthographic projection of the first sunken platform on the first surface is located within the orthographic projection of the second sunken platform on the first surface; The first plastic part includes a first limiting portion, a second limiting portion and a flange portion. The first limiting portion defines the second limiting groove. The second limiting portion is connected to the surface of the first limiting portion facing the second surface and is clamped in the first sinking platform. The flange portion is arranged around the outer peripheral side of the first limiting portion and is clamped in the second sinking platform.

12. The cover plate assembly according to any one of claims 1 to 11, characterized in that: The heat conducting plate is provided with a positioning step, and the positioning step includes a first positioning surface and a second positioning surface. The first positioning surface is parallel to the first surface, and the second positioning surface is perpendicular to the first positioning surface. The connecting portion abuts against the first positioning surface, and the connecting portion abuts against the second positioning surface.

13. A battery cell, characterized in that: include: a housing defining a receiving cavity having an opening; A battery cell body, the battery cell body being disposed in the accommodating cavity and having a tab; According to any one of claims 1-12, the cover assembly is sealed at the opening of the accommodating cavity, and the adapter electrode is connected to the electrode ear.

14. A battery pack, characterized in that: include: A plurality of battery cells, wherein the battery cells are the battery cells according to claim 13; The cooling plate contacts the surface of the heat conducting sheet away from the first surface, and the cooling plate contacts the connecting portion.

15. The battery pack according to claim 14, characterized in that: The surface of the connecting portion away from the guide column is a connecting surface, and the battery pack further includes: a tab, which is connected to the connecting surfaces of the poles of opposite polarity of two adjacent battery cells, and part of the cooling plate is sandwiched between the tab and the heat conducting plate.

16. The battery pack according to claim 14, wherein: The surface of the connecting portion away from the guide column is a connecting surface, and the battery pack further includes: a tab, which is connected to the connecting surfaces of the two connecting portions of the same pole, the cooling plate is clamped between the tab and the heat conducting plate, and the connecting surfaces of the poles of opposite polarities of two adjacent battery cells are connected through the tab.

17. The battery pack according to claim 15 or 16, characterized in that: The battery cell has two poles, which are respectively a positive pole and a negative pole; The material of the connecting portion of the tab and the positive electrode column is the same; and / or, the material of the connecting portion of the tab and the negative electrode column is the same.

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