Battery structure

Abstract

The present invention relates to the technical field of battery devices, and discloses a battery structure, which includes: a shell; a pole group, which is arranged in the shell; a cover plate, which is arranged at the opening of the shell to seal the pole group in the shell; a pole ear, which is extended from at least one side end face of the pole group, and the pole ear is electrically connected to the pole column, and the pole column is arranged on the shell or the cover plate; a support assembly, which is arranged in the shell, and the support assembly abuts against the pole ear, so that at least a part of the pole ear is directly or indirectly in contact with the inner surface of the shell and / or the inner surface of the cover plate. The battery structure provided by the present invention can make the heat of the pole ear be transferred to the shell, which is convenient for the pole ear to dissipate heat and is convenient to meet the use conditions of high rate and large current. The pole ear is directly transferred to the shell, which reduces the need for the pole ear to conduct heat to the pole group for heat dissipation, shortens the heat transfer path, and improves the heat dissipation efficiency of the pole ear.

Description

Technical Field

[0001] The present invention relates to the technical field of battery devices, and in particular to a battery structure. Background Art

[0002] High-rate fast charging of batteries has gradually become a market application trend. However, the problem brought by fast charging is the increase in heat generation. Taking square cells as an example, the internal pole group and pole column cover are generally connected through pole ears and current collectors. In the high-rate fast charging scenario, high temperatures are easily generated at the connection point between the pole ears and the current collector. The main reason is that the main heat dissipation path at this location is from the pole ears to the pole group, and from the current collector to the pole column. The long heat transfer path is not easy to dissipate heat, which makes it difficult to support high-rate and high-current fast charging. Summary of the invention

[0003] In view of this, the present invention provides a battery structure to solve the problem of poor heat dissipation at the tab position.

[0004] The present invention provides a battery structure, comprising:

[0005] case;

[0006] A pole group is arranged in the shell;

[0007] A cover plate is arranged at the opening of the shell to seal the electrode group in the shell;

[0008] The pole ear is formed by extending at least one end surface of the pole group, and the pole ear is electrically connected to the pole column, and the pole column is arranged on the shell or the cover plate;

[0009] The support assembly is arranged in the shell, and the support assembly abuts against the pole ear, so that at least a part of the pole ear is directly or indirectly in contact with the inner surface of the shell and / or the inner surface of the cover plate.

[0010] Beneficial effects: The battery structure provided by the present invention, by arranging a support assembly in the shell, makes the support assembly abut against the pole ear, so that at least part of the pole ear is directly or indirectly in contact with the inner surface of the shell or the inner surface of the cover plate, so that the heat of the pole ear can be transferred to the shell, which is convenient for the pole ear to dissipate heat, and is convenient for meeting the use conditions of high rate and large current, so that the heat dissipation performance of the battery structure is improved. The pole ear can directly transfer heat to the shell, reducing the need for the pole ear to conduct heat dissipation to the pole group, shortening the heat transfer path, and improving the heat dissipation efficiency of the pole ear.

[0011] In an optional embodiment, it further includes: an insulating heat-conducting member, which is arranged between the inner surface of the pole ear and the shell body, and / or, is arranged between the inner surface of the pole ear and the cover plate.

[0012] Beneficial effect: The insulating heat-conducting member is made of insulating material. By providing insulation, the short circuit connection between the tab and the shell, or the short circuit connection between the tab and the cover plate can be avoided. By making the insulating heat-conducting member itself insulating, the use of separate insulating materials can be reduced, thereby reducing the overall quality of the battery structure.

[0013] In an optional embodiment, the tab is bent to form a groove, and the support assembly is arranged in the groove formed by the bending of the tab;

[0014] At least one outer surface of the support assembly is arranged in contact with the tab.

[0015] Beneficial effect: By bending the tab to form a groove, the support assembly is arranged in the groove formed by the bending of the tab, so that the tab can be stretched open, so that the tab fits with the inner surface of the shell and / or the inner surface of the cover plate, ensuring a firm fit and improving the heat dissipation efficiency. At the same time, at least one outer surface of the support assembly is arranged to fit with the tab, which can further increase the contact area between the support assembly and the tab and improve the heat dissipation efficiency.

[0016] In an optional embodiment, the electrode tab includes a lead-out portion connected to the electrode group and a connecting portion connected to the electrode column, and a bending portion is formed between the lead-out portion and the connecting portion;

[0017] The bent portion is arranged along the thickness direction of the battery structure close to the inner surface of the second side of the shell.

[0018] Beneficial effect: By arranging the bending portion along the thickness direction of the battery structure close to the inner surface of the second side of the shell, it is convenient for the support assembly to extrude the pole ear so that more areas of the pole ear are in contact with the inner surface of the shell and / or the inner surface of the cover plate, thereby improving the heat dissipation efficiency.

[0019] In an optional embodiment, along the thickness direction of the battery structure, the support assembly has a second support surface abutting against the bent portion, and a first support surface abutting against the inner surface of the first side of the shell;

[0020] And / or, the tab is formed by stacking a plurality of single tabs, and as the single tabs are stacked, after the lead-out portion is formed, the tab is adapted to be inclined in the thickness direction;

[0021] And / or, the support assembly is further formed with an inclined guide surface that fits the lead-out portion, and the angle between the inclined guide surface and the second support surface is β, wherein β satisfies: 90°<β<180°.

[0022] Beneficial effect: By forming the support component with an inclined guide surface that fits the lead-out portion, the fit effect between the support component and the tab can be ensured, the contact area is increased, and the uniformity of heat dissipation can be ensured. At the same time, excessive squeezing of the tab by the support component can be avoided, and the occurrence of local single-piece tab breakage can be avoided.

[0023] In an optional embodiment, the support assembly includes: a support shell and an inner core filled in the support shell;

[0024] The support shell is made of thermally conductive flexible material, and the inner core is made of elastic material;

[0025] Wherein, the material of the support shell includes graphene or boron nitride;

[0026] The materials of the inner core include foam;

[0027] When the supporting shell is graphene, the outer surface of the supporting shell is also covered with an insulating film.

[0028] Beneficial effects: By making the support component composited with multiple materials, and coating the support shell outside the inner core, and making the material of the support shell include graphene or boron nitride, the heat dissipation effect can be improved and good conductivity can be ensured. And the material of the inner core includes foam, and the flexible deformation of the foam can be used to achieve better fit between the support component and the tab, increase the contact area, and ensure uniform heat dissipation.

[0029] In an optional embodiment, the support assembly includes: a support shell and an inner core filled in the support shell;

[0030] The supporting shell is made of insulating sealing material;

[0031] The inner core is made of phase change material, and the inner core is sealed inside the supporting shell;

[0032] The material of the inner core includes paraffin wax.

[0033] Beneficial effect: By making the inner core of phase change material, the high specific heat capacity of the phase change material can be utilized to quickly absorb the heat generated by the tab and improve the heat dissipation efficiency.

[0034] In an optional embodiment, the pole lug is arranged on the pole lug lead-out surface of the pole group;

[0035] Along the long side parallel to the lead-out surface of the tab, the length of the tab is W, which satisfies:

[0036] W>0.3H, where H is the length of the lead-out surface of the tab. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0038] Figure 1 It is a three-dimensional schematic diagram of the battery structure of the present invention;

[0039] Figure 2 is a cross-sectional schematic diagram of the battery structure of the present invention;

[0040] Figure 3 for Figure 2 Zoom in on A Figure 1 ;

[0041] Figure 4 It is an exploded schematic diagram of the battery structure of the present invention;

[0042] Figure 5 for Figure 2 Zoom in on A Figure 2 .

[0043] Description of reference numerals:

[0044] 1. Shell; 11. Explosion-proof unit; 2. Cover plate; 21. Pole; 3. Pole group; 31. Pole ear lead-out surface;

[0045] 4. Tab; 41. Lead-out portion; 42. Connecting portion; 43. Bending portion;

[0046] 5. Support assembly; 51. Support shell; 511. First support surface; 512. Second support surface; 513. Inclined guide surface; 52. Inner core; 7. Insulating heat conductive member. DETAILED DESCRIPTION

[0047] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0048] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0049] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0050] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0051] Combine the following Figures 1 to 4 , describing an embodiment of the present invention.

[0052] According to an embodiment of the present invention, there is provided a battery structure, comprising:

[0053] Shell 1;

[0054] The pole group 3 is arranged in the housing 1;

[0055] A cover plate 2 is arranged on the opening of the housing 1 to seal the electrode group 3 in the housing 1;

[0056] The pole ear 4 is formed by extending from at least one end surface of the pole group 3. The pole ear 4 is electrically connected to the pole 21. The pole 21 is arranged on the housing 1 or the cover plate 2.

[0057] The support assembly 5 is disposed in the housing 1 , and abuts against the pole lug 4 , so that at least a portion of the pole lug 4 is directly or indirectly in contact with the inner surface of the housing 1 and / or the inner surface of the cover plate 2 .

[0058] In this embodiment, a square-shell battery is taken as an example, and the shell 1 is enclosed to form four surfaces. Along the length direction of the battery structure, an opening is formed at one end of the shell 1, or openings are formed at both ends. By covering the opening of the shell 1 with a cover plate 2 and sealingly connecting the cover plate 2 to the shell 1, the electrode group 3 can be enclosed in the shell 1.

[0059] A pole lug 4 is formed by extending from at least one end surface of the pole group 3 . In this embodiment, the pole group 3 has two pole lugs 4 , namely a positive pole lug and a negative pole lug.

[0060] The electrode tab 4 is electrically connected to the electrode post 21 , so that the electrode group 3 can be connected to an external circuit for charging and discharging.

[0061] Optionally, the pole lug 4 is connected to the pole post 21 by welding.

[0062] Optionally, the pole 21 is arranged on the housing 1 or the cover plate 2 .

[0063] The battery structure provided by the embodiment of the present invention is provided with a support assembly 5 in the housing 1, so that the support assembly 5 is in contact with the pole lug 4, so that the pole lug 4 is at least partially in direct or indirect contact with the inner surface of the housing 1 or the inner surface of the cover plate 2, so that the heat of the pole lug 4 can be transferred to the housing 1, which is convenient for the pole lug 4 to dissipate heat, and is convenient for meeting the use conditions of high rate and large current, so that the heat dissipation performance of the battery structure is improved. The pole lug 4 can directly transfer heat to the housing 1, reducing the need for the pole lug 4 to conduct heat dissipation to the pole group 3, shortening the heat transfer path, and improving the heat dissipation efficiency of the pole lug 4.

[0064] At the same time, by quickly dissipating the heat of the pole ear 4, high temperature can be avoided inside the battery structure, the temperature curve inside the battery structure can be smoother, the service life of the pole group can be improved, the melting of plastic parts caused by high temperature can be avoided, and the internal short circuit of the battery structure caused by excessive melting can be prevented, thereby improving the safety of the battery structure.

[0065] The tab 4 may be directly bonded to the inner surface of the housing 1 or the inner surface of the cover plate 2 , or may be indirectly bonded by providing a heat conducting member.

[0066] Since the tab 4 is conductive, the tab 4 and the housing 1 need to be insulated at the joint position to avoid short circuit between the tab 4 and the housing 1. Similarly, the tab 4 and the cover plate 2 need to be insulated at the joint position to avoid short circuit between the tab 4 and the cover plate 2.

[0067] In some embodiments, in combination Figure 3 As shown, the battery structure further includes: an insulating heat-conducting member 7, which is disposed between the pole tab 4 and the inner surface of the shell 1, and / or, the insulating heat-conducting member 7 is disposed between the pole tab 4 and the inner surface of the cover plate 2.

[0068] The insulating heat-conducting member 7 is made of an insulating material, and by providing insulation, a short circuit connection between the tab 4 and the housing 1 or a short circuit connection between the tab 4 and the cover plate 2 can be avoided. By making the insulating heat-conducting member 7 itself insulating, the use of separate insulating materials is reduced, thereby reducing the overall quality of the battery structure.

[0069] Optionally, the insulating heat conductive member 7 is made of a heat conductive material, which can enable the pole ear 4 to form a good contact surface with the shell 1 to achieve a more effective heat conduction path; or, enable the pole ear 4 to form a good contact surface with the cover plate 2 to achieve a more effective heat conduction path.

[0070] Optionally, the insulating heat-conducting member 7 may be made of a thermally conductive pad, thermally conductive paste, thermally conductive glue or other materials.

[0071] In some embodiments, in combination Figure 3As shown, the pole ear 4 is bent to form a groove, and the support assembly 5 is arranged in the groove formed by the bending of the pole ear 4;

[0072] At least one outer surface of the support assembly 5 is disposed in close contact with the pole lug 4 .

[0073] By bending the pole ear 4 to form a groove, the support assembly 5 is arranged in the groove formed by the bending of the pole ear 4, which can stretch the pole ear 4 so that the pole ear 4 fits with the inner surface of the shell 1 and / or the inner surface of the cover plate 2, ensuring a firm fit and improving the heat dissipation efficiency.

[0074] At the same time, at least one outer surface of the support assembly 5 is arranged in close contact with the pole lug 4, which can further increase the contact area between the support assembly 5 and the pole lug 4 and improve the heat dissipation efficiency.

[0075] Optionally, multiple outer surfaces of the support assembly 5 corresponding to the tab 4 are arranged in contact with the tab 4, so as to ensure that each area of ​​the tab 4 can dissipate heat and ensure uniform heat dissipation, so as to improve the heat conduction effect of the tab 4 in a limited space.

[0076] Since the tab 4 is formed by stacking a number of single tabs, as the single tabs are stacked, in order to ensure that the tab 4 is arranged close to the inner surface of the second side of the shell 1 along the thickness direction of the battery structure, it is necessary to make the multiple single tabs tilt toward the second side close to the shell 1. At the same time, since the tab 4 also needs to be welded with the pole 21, it will naturally form a groove shape after the tab is formed. Therefore, by arranging the support assembly 5 in the groove formed by the bending of the tab 4, the kneading method of the tab 4 can be reasonably utilized, which is convenient for welding the tab 4 with the cover plate 2, and at the same time, the heat dissipation area of ​​the tab 4 is increased.

[0077] In some embodiments, in combination Figure 5 As shown, the pole lug 4 includes a lead-out portion 41 connected to the pole group 3 and a connecting portion 42 connected to the pole 21, and a bending portion 43 is formed between the lead-out portion 41 and the connecting portion 42;

[0078] The bent portion 43 is disposed along the thickness direction of the battery structure close to the inner surface of the second side of the housing 1 .

[0079] By arranging the bending portion 43 along the thickness direction of the battery structure close to the inner surface of the second side of the shell 1, it is convenient for the support assembly 5 to extrude the pole ear 4 so that more areas of the pole ear 4 are in contact with the inner surface of the shell 1 and / or the inner surface of the cover plate 2, thereby improving the heat dissipation efficiency.

[0080] In some embodiments, in combination Figure 5 As shown, along the thickness direction of the battery structure, the support assembly 5 has a second support surface 512 abutting against the bent portion 43, and a first support surface 511 abutting against the inner surface of the first side of the housing 1;

[0081] The tab 4 is formed by stacking a plurality of single tabs. As the single tabs are stacked, after the lead-out portion 41 is formed, the tab 4 is adapted to be inclined along the thickness direction.

[0082] The support assembly 5 is further formed with an inclined guide surface 513 that fits the lead-out portion 41 , and the angle between the inclined guide surface 513 and the second support surface 512 is β, wherein β satisfies: 90°<β<180°.

[0083] By forming the support assembly 5 with an inclined guide surface 513 that fits the lead-out portion 41, the fit between the support assembly 5 and the tab 4 can be ensured, the contact area can be increased, and the uniformity of heat dissipation can be ensured. At the same time, the support assembly 5 can be prevented from over-extruding the tab 4, and the occurrence of local single-piece tab breakage can be avoided.

[0084] In some embodiments, in combination Figure 4 As shown, the support assembly 5 includes: a support shell 51 and an inner core 52 filled in the support shell 51;

[0085] The support shell 51 is made of a thermally conductive flexible material, and the inner core 52 is made of an elastic material;

[0086] Wherein, the material of the support shell 51 includes graphene or boron nitride;

[0087] The material of the inner core 52 includes foam;

[0088] When the supporting shell 51 is graphene, the outer surface of the supporting shell 51 is also covered with an insulating film.

[0089] By making the support component 5 composite with multiple materials, covering the support shell 51 outside the inner core 52, and making the material of the support shell 51 include graphene or boron nitride, the heat dissipation effect can be improved and good conductivity can be ensured. And making the material of the inner core 52 include foam, the flexible deformation of the foam can be used to achieve better fit between the support component 5 and the tab 4, increase the contact area, and ensure uniform heat dissipation.

[0090] When the support shell 51 is graphene, since graphene has conductive properties, an insulating film needs to be coated on the outer surface of the support shell 51 to prevent the tab 4 from being short-circuited with the shell 1 .

[0091] As a modified embodiment, the support assembly 5 includes: a support shell 51 and an inner core 52 filled in the support shell 51;

[0092] The supporting shell 51 is made of insulating sealing material;

[0093] The inner core 52 is made of phase change material and is sealed inside the supporting shell 51;

[0094] The material of the inner core 52 includes paraffin.

[0095] By making the inner core 52 of phase change material, the high specific heat capacity of the phase change material can be utilized to quickly absorb the heat generated by the tab, thereby increasing the heat dissipation efficiency.

[0096] When the material of the inner core 52 is paraffin, since the paraffin melts when heated, the support shell 51 needs to be made of an insulating sealing material so as to seal the paraffin inside the support shell 51 to prevent it from flowing out, and at the same time facilitate the heat transfer of the support shell 51 to the inside. At this time, the support shell 51 can also be made of a heat-conducting material to improve the heat conduction efficiency of the support shell 51 to the tab 4.

[0097] In some embodiments, in combination Figure 4 As shown, the pole lug 4 is arranged on the pole lug lead-out surface 31 of the pole group 3;

[0098] Along the long side parallel to the tab lead-out surface 31, the length of the tab 4 is W, which satisfies:

[0099] W>0.3H, wherein H is the length of the tab lead surface 31 .

[0100] In order to achieve a better heat conduction effect, by ensuring the length of the pole ear 4, the pole ear 4 can have a larger heat dissipation area.

[0101] In some embodiments, in combination Figure 1 As shown, the battery structure further includes: an explosion-proof unit 11 , which is not arranged on the same housing 1 or cover plate 2 together with the pole 21 .

[0102] The explosion-proof unit 11 may specifically be an explosion-proof valve.

[0103] By not providing the explosion-proof unit 11 and the pole 21 on the same housing 1 or cover plate 2 at the same time, it can be ensured that the explosion-proof unit 11 and the pole 21 are not on the same surface, so that the pole lug 4 is independently arranged on the surface of one side, which helps to make the pole lug 4 larger in size to ensure heat dissipation efficiency.

[0104] The pole 21 includes a positive pole and a negative pole; as an implementation form, the positive pole and the negative pole are not in the same plane, so as to ensure that a single surface of the battery structure has a single output pole, so that the corresponding pole lug 4 can be larger. For example, in this embodiment, the positive pole and the negative pole are respectively located at the two ends of the pole group 3 along the length direction, that is, the two faces of the shortest edge of the battery structure. As another implementation form, the positive pole and the negative pole are arranged in the same plane. For example, the positive pole and the negative pole can be simultaneously arranged on the surface formed by the longest edge of the battery structure. The length of the pole lugs corresponding to the positive pole and the negative pole are both less than half of the longest edge. At this time, the length of the pole lug 4 can also be guaranteed.

[0105] Obviously, the above embodiments are only examples for clear explanation, and are not intended to limit the implementation methods. Although the embodiments of the present invention are described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the present invention.

Claims

1. A battery structure, characterized in that: include: case; A pole group is arranged in the shell; A cover plate, which is arranged at the opening of the shell to seal the electrode group in the shell; A pole ear, formed by extending from at least one end surface of the pole group, the pole ear is electrically connected to a pole, and the pole is arranged on the housing or the cover plate; A support assembly is disposed in the housing, the support assembly abuts against the pole lug, so that at least a portion of the pole lug is directly or indirectly in contact with the inner surface of the housing and / or the inner surface of the cover plate; The electrode tab includes a lead-out portion connected to the electrode group and a connecting portion connected to the electrode column, and a bending portion is formed between the lead-out portion and the connecting portion; the bending portion is arranged along the thickness direction of the battery structure close to the inner surface of the second side of the shell; Along the thickness direction of the battery structure, the support assembly has a second support surface abutting against the bent portion, and a first support surface abutting against the inner surface of the first side of the shell; The tab is formed by stacking a plurality of single tabs, and as the single tabs are stacked, after the lead-out portion is formed, the tab is adapted to be inclined in the thickness direction; The support assembly is further formed with an inclined guide surface that fits the lead-out portion, and the angle between the inclined guide surface and the second support surface is β, wherein β satisfies: 90°<β<180°; The support assembly comprises: a support shell and an inner core filled in the support shell; the support shell is made of a thermally conductive flexible material, and the inner core is made of an elastic material; the material of the support shell comprises graphene or boron nitride; the material of the inner core comprises foam; when the support shell is graphene, the outer surface of the support shell is also covered with an insulating film; Alternatively, the support assembly includes: a support shell and an inner core filled in the support shell; the support shell is made of an insulating sealing material; the inner core is made of a phase change material, and the inner core is sealed in the support shell; the material of the inner core includes paraffin.

2. The battery structure according to claim 1, characterized in that: Also includes: The insulating heat-conducting member is arranged between the inner surface of the pole ear and the shell body, and / or between the inner surface of the pole ear and the cover plate.

3. The battery structure according to claim 1, characterized in that: The tab is bent to form a groove, and the support assembly is arranged in the groove formed by the bending of the tab; At least one outer surface of the support assembly is disposed in contact with the tab.

4. The battery structure according to any one of claims 1 to 3, characterized in that: The pole lug is arranged on the pole lug lead-out surface of the pole group; Along the long side parallel to the lead-out surface of the tab, the length of the tab is W and satisfies: W>0.3H, wherein H is the length of the lead-out surface of the tab.

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