Battery monomer, battery module and battery pack
By incorporating heat-conducting fins and heat dissipation components within the battery cell, the problem of untimely cooling of the battery cell is solved, effectively dissipating internal heat, extending the battery cell's lifespan, and improving safety performance.
Patent Information
- Application Number
- CN202423178881.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-20
- Publication Date
- 2025-12-26
- Estimated Expiration
- 2034-12-20
AI Technical Summary
The existing cooling structure of battery cells cannot dissipate heat in time, resulting in heat concentration inside the cells, which shortens the cycle life of the battery cells and reduces safety performance.
A heat-conducting fin and a heat sink are installed inside the casing of the battery cell. The heat-conducting fin is located between the electrode groups, and the heat sink is sealed inside the casing and thermally connected to the heat-conducting fin to achieve direct cooling of the inside of the battery cell.
By combining heat-conducting sheets and heat dissipation components, heat inside the casing is effectively absorbed and transferred, extending the cycle life of individual battery cells and improving safety performance.
Smart Images
Figure CN223728830U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to battery technology field especially relates to a battery monomer, battery module and battery package. BACKGROUND
[0002] At present, the cooling mode of the battery monomer is to set the cooling structure such as the heat sink or liquid cooling system on the outside of the battery monomer, and the cooling structure absorbs heat outside the battery monomer to cool the battery monomer.
[0003] With the increase of the charging power of the battery monomer, the heat generation of the battery monomer will grow exponentially, and if the cooling structure cannot cool the outside of the battery monomer in time, it will cause the heat concentration in the inside of the battery monomer, and then make the inside temperature of the battery monomer too high, eventually shorten the cycle life of the battery monomer and reduce the safety performance of the battery monomer.
[0004] Therefore, it is urgent to provide a battery monomer, battery module and battery package to solve the above technical problems. INVENTION CONTENTS
[0005] The first purpose of the utility model is to provide a battery monomer, which can cool the inside of the battery monomer.
[0006] To achieve this purpose, the utility model adopts the following technical scheme:
[0007] The battery monomer comprises:
[0008] A shell;
[0009] A pole group, the pole group is arranged in the shell, and the pole group comprises a first pole sheet and a second pole sheet;
[0010] A cooling structure, the cooling structure comprises a heat conduction sheet and a heat dissipation piece, the heat conduction sheet is located between the first pole sheet and the second pole sheet, the heat dissipation piece is sealed and arranged in the shell, and the heat dissipation piece in the shell is in heat conduction connection with the heat conduction sheet.
[0011] Optionally, the heat conduction sheet comprises a metal layer and a graphene layer, and the metal layer is fixedly attached to the graphene layer.
[0012] Optionally, the number of the graphene layers is two, and the metal layer is arranged between the two graphene layers.
[0013] Optionally, the metal layer comprises a heat absorption part and a heat conduction part connected with each other, the heat absorption part is fixedly attached to the graphene layer and located between the first pole sheet and the second pole sheet, and the heat conduction part extends out of the pole group and is in heat conduction connection with the heat dissipation piece.
[0014] Optionally, the cooling structure further comprises a connecting piece, the connecting piece is a heat conduction element, the connecting piece is located in the shell, and the heat conduction part and the heat dissipation piece are connected with the connecting piece.
[0015] Optionally, the shell comprises two shell layers, the two shell layers are oppositely arranged, edges of the shell layers are sealing parts, the sealing parts of the two shell layers are sealingly connected, a cavity is formed between the two shell layers, the pole group is arranged in the cavity, the heat dissipation piece comprises a connecting part, a heat dissipation part and a sealing part, the connecting part is located in the cavity and is in heat conduction connection with the heat conduction sheet, the heat dissipation part is located outside the cavity, the heat dissipation part is connected with the connecting part through the sealing part, and the sealing part is sealingly fixed between the two sealing parts.
[0016] Optionally, the cooling structure further comprises a first adhesive layer, the sealing part is embedded in the first adhesive layer and is sealingly fixed between the two sealing parts through the first adhesive layer.
[0017] Optionally, the pole group further comprises a diaphragm, the diaphragm is arranged between the first pole sheet and the heat conduction sheet and between the second pole sheet and the heat conduction sheet.
[0018] The second object of the utility model provides a battery module, which can cool the inside of a battery monomer.
[0019] To achieve the object, the utility model adopts the following technical scheme:
[0020] The battery module comprises the battery monomer.
[0021] The third object of the utility model provides a battery pack, which can cool the inside of a battery monomer.
[0022] To achieve the object, the utility model adopts the following technical scheme:
[0023] The battery pack comprises the battery module.
[0024] The utility model has the advantages of:
[0025] The battery monomer provided by the utility model is provided with a cooling structure, the cooling structure comprises a heat conduction sheet and a heat dissipation piece, the heat conduction sheet is arranged in a shell, and the heat conduction sheet is located between a first pole sheet and a second pole sheet of a pole group, the heat dissipation piece is sealingly arranged in the shell, and the heat dissipation piece in the shell is in heat conduction connection with the heat conduction sheet, in actual application, the heat conduction sheet absorbs heat in the shell, especially heat emitted by the first pole sheet and the second pole sheet, and the heat conduction sheet transmits the heat to the heat dissipation piece, and the heat dissipation piece transmits the heat out of the shell, thereby realizing direct cooling of the inside of the battery monomer, which is favorable for prolonging the cycle life of the battery monomer and improving the safety performance of the battery monomer. BRIEF DESCRIPTION OF DRAWINGS
[0026] Figure 1 It is the structural schematic view of the battery monomer provided by the utility model;
[0027] Figure 2It is the assembling structure schematic view of the pole group and cooling structure provided by the utility model;
[0028] Figure 3 It is the structure schematic view of the heat conduction sheet provided by the utility model;
[0029] Figure 4 It is the assembling structure schematic view of the connecting piece, the first adhesive layer and the heat dissipation piece provided by the utility model;
[0030] Figure 5 It is the assembling structure schematic view of the packaging part and the heat dissipation piece provided by the utility model.
[0031] In the drawing,
[0032] 1, shell;11, shell layer;111, packaging part;112, edge sealing;113, second adhesive layer;21, first pole piece;22, second pole piece;23, diaphragm;31, heat conduction sheet;311, metal layer;3111, heat absorbing part;3112, heat conducting part;312, graphene layer;32, heat dissipation piece;33, connecting piece;34, first adhesive layer;4, pole lug. Specific implementation
[0033] The utility model will be further explained in detail below in combination with the drawings and examples.It can be understood that the specific examples described here are only used to explain the utility model, and not limited to the utility model.In addition, it should be noted that in order to facilitate the description, only the part related to the utility model is shown in the drawing, not all the structures.
[0034] In the description of the utility model, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated;It can be mechanical connection, or electrical connection;It can be directly connected, or indirectly connected through intermediate medium, or it can be the communication or interaction relationship between two elements.For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.
[0035] In the utility model, unless otherwise explicitly specified and limited, the first feature is "on" or "below" the second feature, which can include the direct contact of the first and second features, or the contact of the first and second features through another feature between them.In addition, the first feature "on", "above" and "above" the second feature includes the first feature directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature.The first feature "below", "below" and "below" the second feature includes the first feature directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.
[0036] In the description of the present embodiment, the terms "upper", "lower", "right", "left", and the like, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of description and simplification of operation, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only used to distinguish in the description, and have no special meaning.
[0037] The present embodiment provides a battery monomer capable of cooling the inside of the battery monomer.
[0038] Specifically, as shown in Figure 1 and Figure 2 , the battery monomer includes a shell 1, a pole group, and a cooling structure, wherein the pole group is arranged in the shell 1, the pole group includes a first pole piece 21 and a second pole piece 22, the cooling structure includes a heat-conducting sheet 31 and a heat-dissipating piece 32, the heat-conducting sheet 31 is located between the first pole piece 21 and the second pole piece 22, the heat-dissipating piece 32 is sealed and penetrates the shell 1, and the heat-dissipating piece 32 located in the shell 1 is in thermal conductive connection with the heat-conducting sheet 31.
[0039] The battery monomer is provided with a cooling structure, the cooling structure includes a heat-conducting sheet 31 and a heat-dissipating piece 32, the heat-conducting sheet 31 is arranged in the shell 1, and the heat-conducting sheet 31 is located between the first pole piece 21 and the second pole piece 22 of the pole group, the heat-dissipating piece 32 is sealed and penetrates the shell 1, and the heat-dissipating piece 32 located in the shell 1 is in thermal conductive connection with the heat-conducting sheet 31. In actual application, the heat-conducting sheet 31 absorbs the heat inside the shell 1, especially the heat emitted by the first pole piece 21 and the second pole piece 22, and the heat-conducting sheet 31 transmits the heat to the heat-dissipating piece 32, and the heat-dissipating piece 32 transmits the heat out of the shell 1, thereby realizing direct cooling of the inside of the battery monomer, which is conducive to prolonging the cycle life of the battery monomer and improving the safety performance of the battery monomer.
[0040] In the present embodiment, one of the first pole piece 21 and the second pole piece 22 is a positive pole piece, and the other is a negative pole piece. In other embodiments, the first pole piece 21 and the second pole piece 22 can both be positive pole pieces, or the first pole piece 21 and the second pole piece 22 can both be negative pole pieces.
[0041] Further, the pole group further includes a diaphragm 23, and the diaphragm 23 is arranged between the first pole piece 21 and the heat-conducting sheet 31 and between the second pole piece 22 and the heat-conducting sheet 31, so as to prevent short circuit between the first pole piece 21 and the heat-conducting sheet 31 and between the second pole piece 22 and the heat-conducting sheet 31.
[0042] Optionally, as shown in Figure 3As shown, the heat-conducting sheet 31 comprises a metal layer 311 and a graphene layer 312, the metal layer 311 is fixedly attached to the graphene layer 312, the graphene has better heat-conducting performance than the metal, and the fixed attachment of the metal layer 311 to the graphene layer 312 to form the heat-conducting sheet 31 can make the heat-conducting sheet 31 have excellent heat-conducting performance, thereby improving the cooling efficiency of the first pole piece 21 and the second pole piece 22.
[0043] In this embodiment, the metal layer 311 is a copper layer, and of course, in other embodiments, the metal layer 311 can also be an aluminum layer or an iron layer, etc.
[0044] Further, the number of graphene layers 312 is two, and the metal layer 311 is sandwiched between the two graphene layers 312, and both sides of the heat-conducting sheet 31 are graphene layers 312, which not only improves the heat-conducting performance of the heat-conducting sheet 31, but also improves the heat-conducting uniformity on both sides of the heat-conducting sheet 31, further improving the cooling efficiency of the first pole piece 21 and the second pole piece 22.
[0045] Optionally, as shown in Figure 2 and Figure 3 , the metal layer 311 comprises a heat-absorbing part 3111 and a heat-conducting part 3112 connected to each other, the heat-absorbing part 3111 is fixedly attached to the graphene layer 312 and located between the first pole piece 21 and the second pole piece 22, and the heat-conducting part 3112 extends out of the pole group and is in heat-conducting connection with the heat-dissipating member 32. This structural design can reduce the thickness of the pole group and make full use of the internal space of the shell 1, which is conducive to improving the energy density of the battery monomer.
[0046] Optionally, as shown in Figure 2 and Figure 4 , the cooling structure further comprises a connecting member 33, the connecting member 33 is a heat-conducting element, the connecting member 33 is located in the shell 1, and the heat-conducting part 3112 and the heat-dissipating member 32 are connected to the connecting member 33 to realize the heat-conducting connection between the heat-conducting sheet 31 and the heat-dissipating member 32.
[0047] In this embodiment, the number of heat-conducting sheets 31 is multiple, for example, the number of heat-conducting sheets 31 can be two, three or five, etc., and the number of heat-dissipating members 32 is multiple, for example, the number of heat-dissipating members 32 can be two, five or ten, etc., and the multiple heat-conducting sheets 31 are connected to one side of the connecting member 33, and the multiple heat-dissipating members 32 are connected to the other side of the connecting member 33, thereby realizing the heat-conducting connection between the multiple heat-conducting sheets 31 and the multiple heat-dissipating members 32. It can be seen that the arrangement of the connecting member 33 simplifies the connection structure of the multiple heat-conducting sheets 31 and the multiple heat-dissipating members 32, which has the effects of reducing assembly difficulty and improving production efficiency. Of course, in other embodiments, the number of one of the heat-conducting sheet 31 and the heat-dissipating member 32 can be multiple, and the number of the other one can be one, and the specific number of the heat-conducting sheet 31 and the heat-dissipating member 32 can be determined according to the cooling demand of the battery monomer, which is not limited here.
[0048] The pole group provided by the embodiment is a laminated pole group, that is, the number of the first pole pieces 21 and the second pole pieces 22 is both multiple, and the first pole pieces 21 and the second pole pieces 22 are alternately stacked, one or more heat-conducting pieces 31 can be arranged between adjacent one first pole piece 21 and second pole piece 22, or no heat-conducting piece 31 can be arranged, which is determined according to the cooling requirement of the pole group, and is not specifically limited here.
[0049] In other embodiments, the pole group can also be a non-laminated structure, for example, the pole group is a winding pole group, at this time, the number of the first pole pieces 21 and the second pole pieces 22 is both one, the first pole pieces 21 and the second pole pieces 22 are alternately distributed along the direction of the axis of the pole group to the outer wall of the pole group, and the heat-conducting piece 31 is located between any one first pole piece 21 and the second pole piece 22 adjacent thereto.
[0050] In the embodiment, the heat-dissipating pieces 32 are columnar structures, and the plurality of heat-dissipating pieces 32 are arranged at intervals to improve the heat-dissipating efficiency. The connecting pieces 33 are plate-like or sheet-like structures to reduce the internal space of the shell 1 occupied by the connecting pieces 33, and also ensure the connection reliability of the connecting pieces 33 and the heat-conducting pieces 31 and the connection reliability of the connecting pieces 33 and the heat-dissipating pieces 32.
[0051] In the embodiment, the heat-dissipating pieces 32 and the connecting pieces 33 are both copper materials, which have good heat conductivity and good structural strength. Of course, in other embodiments, the heat-dissipating pieces 32 and the connecting pieces 33 can also be aluminum, iron or other materials.
[0052] In the embodiment, the heat-conducting part 3112 and the connecting piece 33 can be fixed by welding or heat-conducting adhesive, and the heat-dissipating piece 32 and the connecting piece 33 can be fixed by welding or heat-conducting adhesive.
[0053] The battery cell provided by the embodiment is a soft-pack battery, specifically, as shown in Figure 1 and Figure 5As shown, the shell 1 includes two shell layers 11, the two shell layers 11 are oppositely arranged, the edges of the shell layers 11 are the packaging portions 111, the packaging portions 111 of the two shell layers 11 are sealingly connected to form the sealing edges 112, a cavity is formed between the two shell layers 11, the pole group is arranged in the cavity, the heat dissipation piece 32 includes a connecting portion, a heat dissipation portion and a sealing portion, the connecting portion is located in the cavity and is in thermal conductive connection with the heat conduction sheet 31, the heat dissipation portion is located outside the cavity, the heat dissipation portion is connected with the connecting portion through the sealing portion, and the sealing portion is sealingly fixed between the two packaging portions 111, so that the heat dissipation piece 32 is sealingly arranged in the shell 1. Of course, in other embodiments, the battery monomer can also be of other structural forms, as long as the heat dissipation piece 32 is sealingly arranged in the shell 1, for example, the shell 1 is a stainless steel shell, a through hole is formed in the wall of the stainless steel shell, the heat dissipation piece 32 is arranged in the through hole, and sealing glue is filled between the heat dissipation piece 32 and the hole wall of the through hole.
[0054] Further, as shown in Figure 4 and Figure 5 The cooling structure further includes a first glue layer 34, the sealing portion is embedded in the first glue layer 34 and is sealingly fixed between the two packaging portions 111 through the first glue layer 34. In actual assembly, the first glue layer 34 is located between the two packaging portions 111 and is tightly sealed against the two packaging portions 111.
[0055] Further, the opposite sides of the two packaging portions 111 are provided with second glue layers 113, and the packaging portions 111 of the two shell layers 11 are sealingly connected through the second glue layers 113 to form the sealing edges 112. When assembling the battery monomer, the first glue layer 34 is arranged between the two second glue layers 113, and then the two packaging portions 111 are tightly sealed, so that the first glue layer 34 is sealingly bonded with the two second glue layers 113.
[0056] In this embodiment, the first glue layer 34 and the second glue layer 113 are both polypropylene (PP) layers. In actual production, the first pole piece 21 and the second pole piece 22 of the pole group are respectively spot-welded with one pole lug 4, the pole group is arranged between the two shell layers 11, and the first glue layer 34 embedded with the sealing portion is arranged between the two second glue layers 113, and then the two packaging portions 111 are tightly sealed through the ultrasonic heat pressing process. Of course, in other embodiments, the first glue layer 34 and the second glue layer 113 can also be polyurethane rubber layers or chloroprene rubber layers, etc. The above ultrasonic heat pressing process is a relatively common production process in the art, which will not be described in detail here.
[0057] The battery module provided by the embodiment can quickly cool the battery monomer, and thus the battery monomer has a longer cycle life and higher safety performance, the service life of the battery module using the battery monomer is prolonged, and the safety performance of the battery module is improved.
[0058] The battery pack provided by the embodiment has a longer service life and higher safety performance.
[0059] Obviously, the above-mentioned embodiments of the utility model are only examples for clearly explaining the utility model, and are not the limitation of the embodiments of the utility model. For the ordinary skilled in the art, various obvious changes, re-adjustments and replacements can be made without departing from the protection scope of the utility model. Here, all the embodiments need not and cannot be exhausted. Any modification, equivalent replacement and improvement made within the spirit and principle of the utility model should be included in the protection scope of the utility model claim.
Claims
1. A battery cell, characterized by The application relates to a battery cell. The battery cell comprises a shell (1), a pole group arranged in the shell (1), and a cooling structure. The cooling structure comprises a heat-conducting sheet (31) and a heat-dissipating piece (32). The heat-conducting sheet (31) comprises a metal layer (311) and a graphene layer (312).
2. The battery cell of claim 1, wherein, The metal layer (311) is fixedly connected with the graphene layer (312).
3. The battery cell of claim 2, wherein, The metal layer (311) comprises a heat-absorbing part (3111) and a heat-conducting part (3112).
4. The battery cell of claim 2, wherein, The heat-absorbing part (3111) is fixedly connected with the graphene layer (312) and arranged between the first pole sheet (21) and the second pole sheet (22).
5. The battery cell of claim 4, wherein, The heat-conducting part (3112) is arranged outside the pole group and is in heat-conducting connection with the heat-dissipating piece (32).
6. The battery cell of any one of claims 1-5, wherein, The cooling structure further comprises a connecting piece (33) which is a heat-conducting element.
7. The battery cell of claim 6, wherein, The connecting piece (33) is arranged in the shell (1).
8. The battery cell of any one of claims 1-5, wherein, The heat-conducting part (3112) and the heat-dissipating piece (32) are connected with the connecting piece (33).
9. A battery module, characterized by The shell (1) comprises two shell layers (11) which are oppositely arranged.
10. A battery pack characterized by, The edges of the shell layers (11) are sealing parts (111). The sealing parts (111) of the two shell layers (11) are sealingly connected. The pole group is arranged in a cavity formed between the two shell layers (11). The heat-dissipating piece (32) comprises a connecting part, a heat-dissipating part and a sealing part. The connecting part is arranged in the cavity and is in heat-conducting connection with the heat-conducting sheet (31). The heat-dissipating part is arranged outside the cavity. The heat-dissipating part is connected with the connecting part through the sealing part. The sealing part is sealingly fixed between the two sealing parts (111). The cooling structure further comprises a first adhesive layer (34). The sealing part is embedded in the first adhesive layer (34) and is sealingly fixed between the two sealing parts (111) through the first adhesive layer (34). The pole group further comprises a diaphragm (23). The diaphragm (23) is arranged between the first pole sheet (21) and the heat-conducting sheet (31) and between the second pole sheet (22) and the heat-conducting sheet (31). The battery cell comprises the battery cell of any one of claims 1-8. The battery module comprises the battery cell of claim 9.