Lithium battery core group

Abstract

The utility model discloses a lithium battery core group, which relates to the technical field of lithium batteries and comprises a shell with a cavity inside; the compartment is arranged in the cavity of the shell and is used for accommodating a battery cell; and the elastic fixing device is arranged in the compartment, and the battery cell is connected with the compartment through the elastic fixing device. According to the technical scheme provided by the utility model, the battery cells are fixed by adopting the compartments and the elastic fixing devices, so that the technical problem that the assembly structure of the existing lithium battery cell group has defects and cannot effectively meet different performance requirements of the lithium battery cell group is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to lithium battery technical field especially relates to a lithium battery core group. BACKGROUND

[0002] Lithium battery core group is the core part in lithium battery system, combine by one or more electric core through series connection, parallel connection or series and parallel connection mode to satisfy specific voltage and capacity requirement. With the progress of science and technology, the demand for energy is also higher and higher, and the energy of single electric core is limited, in order to meet the higher energy demand application scene, usually assemble multiple electric core to increase the total energy of battery group. The current lithium battery core group assembly generally adopts the structure of layer by layer packaging, uses nylon adhesive tape or daubs insulating silica gel on the surface to connect and protect.

[0003] But the assembly structure of the existing lithium battery core group has defects, and cannot effectively meet the different performance requirements of the lithium battery core group. UTILITY MODEL CONTENT

[0004] The utility model discloses a lithium battery core group, which aims to solve the technical problem of the existing lithium battery core group assembly structure defects, which cannot effectively meet the different performance requirements of the lithium battery core group.

[0005] To achieve the above purpose, the utility model provides a lithium battery core group, which comprises:

[0006] A shell has a cavity inside;

[0007] A compartment is provided in the cavity of the shell for accommodating electric cores; and

[0008] An elastic fixing device is provided in the compartment, and the electric core is connected to the compartment through the elastic fixing device.

[0009] In an embodiment, the top of the compartment is provided with a hatch, and the elastic fixing device comprises an elastic buckle provided in the compartment with the opening of the elastic buckle facing the hatch direction of the compartment, and the elastic buckle is in interference fit with the electric core.

[0010] In an embodiment, at least two compartments are provided along the length direction of the shell, and each compartment is provided with an elastic fixing device and an electric core.

[0011] In an embodiment, the lithium battery core group further comprises a heat dissipation structure provided on the inner surface of the shell, and the compartment is in heat transfer connection with the shell through the heat dissipation structure.

[0012] In an embodiment, the heat dissipation structure comprises heat dissipation fins arranged on the inner wall of the shell and abutting against the compartments.

[0013] In an embodiment, the heat dissipation structure comprises a heat conduction channel arranged between two adjacent compartments, and the heat conduction channel is filled with a heat conduction material.

[0014] In an embodiment, the lithium battery core group further comprises a connecting sheet arranged in the cavity of the shell, and the electrodes of each of the battery cores are fixed to the connecting sheet by laser welding.

[0015] In an embodiment, the connecting sheet comprises a conductive layer and insulating layers arranged on opposite sides of the conductive layer, wherein a connecting hole is arranged on one of the insulating layers close to the battery core, and each of the battery cores is provided with a connecting hole corresponding to the electrode of the battery core to connect the electrode of the battery core to the conductive layer.

[0016] In an embodiment, one side of the shell is provided with an outlet communicating with the cavity, and the lithium battery core group further comprises a connecting interface arranged at the outlet of the shell, and one end of the connecting sheet extends to the outside of the shell through the connecting interface.

[0017] In an embodiment, the lithium battery core group further comprises a threaded terminal connected to the connecting interface to adapt to different specifications of external circuits.

[0018] In the technical scheme provided by the utility model, the shell is the basic structure of the lithium battery core group, and can provide physical protection and structural support. The shell has a cavity design inside, which can accommodate the compartments and other internal components. The compartment is an independent structure arranged inside the cavity of the shell, and is used for isolating and fixing the battery core. By arranging the compartments, the battery cores can be kept at a proper distance from each other, reducing mutual contact and improving the thermal management efficiency of the lithium battery core group. Moreover, when the battery core needs to be placed in the compartment, the elastic fixing device can deform to a certain extent, thereby tightly holding the battery core and providing stable support and fixation for the battery core. In addition, when the volume of the battery core changes during the charging and discharging process, the elastic fixing device can follow the thermal expansion or contraction of the battery core to correspondingly deform to increase or decrease, thereby ensuring the firmness of fixation while also providing a certain buffering effect. It can be understood that the elastic fixing device will increase when the battery core expands, and the elastic fixing device will decrease when the battery core contracts. The technical scheme provided by the utility model embodiment replaces the layer-by-layer packaging assembly structure, and can effectively meet the different performance requirements of the lithium battery core group. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description, obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained according to the structures shown in these drawings without creative labor.

[0020] Figure 1 The embodiment of the lithium battery core group provided by the present application is a three-dimensional structure schematic diagram Figure 1 ;

[0021] Figure 2 The embodiment of the lithium battery core group provided by the present application is a three-dimensional structure schematic diagram Figure 2 ;

[0022] Figure 3 The embodiment of the lithium battery core group provided by the present application is a cross-sectional structure schematic diagram

[0023] Figure 4 The embodiment of the connecting sheet provided by the present application is a structure schematic diagram.

[0024] Explanation of reference numerals:

[0025] 10, shell; 20, compartment; 30, core; 40, elastic fixing device; 50, heat dissipation fin; 60, heat conduction channel; 70, connecting sheet; 71, conductive layer; 72, insulating layer; 80, connecting interface.

[0026] The realization, functional characteristics and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application, obviously, the described embodiments are only some embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the present application.

[0028] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, …), the directional indications are only used to explain the relative position relationship, movement condition and the like between the components in a certain posture, if the certain posture changes, the directional indications also change accordingly.

[0029] In addition, if the description of "first", "second" and the like is involved in the embodiments of the utility model, the description of "first", "second" and the like is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can be explicitly or implicitly included at least one feature. In addition, if "and / or" or "and / or" appears throughout the text, it means that the three parallel schemes are included, for example, "A and / or B" includes A scheme, or B scheme, or A and B scheme. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, also not within the protection scope required by the utility model.

[0030] With the development of society, the demand for energy is also increasing, the energy of a single cell is limited, in order to meet the application scene of higher energy demand, at present, generally adopt layer by layer packaging structure, assemble multiple cells together, use nylon tape or daub insulating silicone on the surface for connection and protection. However, the above assembly structure has some defects, the firmness is low after packaging, when subjected to external force impact or long time vibration, the cell is easy to displace; and the heat dissipation performance is poor, since the layout inside the cell group is compact, the heat is difficult to effectively dissipate, which will affect the performance and service life of lithium battery; at the same time, the connecting parts between the cells and the external circuit are easy to loosen or have poor contact in the long-term use process.

[0031] Therefore, the utility model embodiment provides a lithium battery cell group, independent compartments are arranged in the shell, and elastic fixing devices are arranged in the compartments, when the cells are put into the compartments, the elastic fixing devices can tightly hold the cells, which can not only ensure the stability of the cells, but also play a certain buffering role, reducing the risk of damage of the cells when subjected to external force impact.

[0032] In order to better understand the above technical solutions, the above technical solutions will be described in detail below in combination with the drawings.

[0033] As shown in Figure 1 , Figure 2 , Figure 3 The utility model embodiment provides a lithium battery cell group, which comprises:

[0034] The shell 10 has a cavity inside;

[0035] The compartment 20 is arranged in the cavity of the shell 10 and is used for accommodating the cell 30; and

[0036] The elastic fixing device 40 is arranged in the compartment 20, and the battery cell 30 is connected with the compartment 20 through the elastic fixing device 40.

[0037] In the technical scheme adopted in the embodiment, the shell 10 is the basic structure of the lithium battery cell group and can provide physical protection and structural support. The shell 10 has a cavity design inside and can accommodate the compartment 20 and other internal components. The compartment 20 is an independent structure arranged inside the cavity of the shell 10 and is used for isolating and fixing the battery cell 30. Through the arrangement of the compartment 20, the battery cells 30 can be kept at a proper distance from each other, reducing mutual contact and improving the thermal management efficiency of the lithium battery cell group. Moreover, when the battery cell 30 needs to be placed in the compartment 20, the elastic fixing device 40 can be deformed to a certain extent, thereby tightly holding the battery cell 30 and providing stable support and fixation for the battery cell 30. In addition, when the volume of the battery cell 30 changes during the charging and discharging process, the elastic fixing device 40 can follow the thermal expansion or contraction of the battery cell 30 to deform correspondingly. Thus, the fixed firmness can be ensured, and a certain buffering effect can also be achieved. It can be understood that the elastic fixing device 40 will be larger when the battery cell 30 is thermally expanded, and the elastic fixing device 40 will be smaller when the battery cell 30 is contracted. The technical scheme proposed in the embodiment of the utility model can effectively meet the needs of the lithium battery cell group for different performances by replacing the layer-by-layer packaging assembly structure.

[0038] Specifically, the lithium battery cell group includes a shell 10, a compartment 20, and an elastic fixing device 40.

[0039] The shell 10 is made of a high-strength metal alloy material with good thermal conductivity, such as aluminum alloy, which can provide physical protection and structural support.

[0040] The compartment 20 is arranged inside the cavity of the shell 10 and is used for isolating and fixing the battery cell 30. It can be understood that the battery cell 30 is placed in the compartment 20, which can keep the battery cells 30 at a proper distance from each other, reducing mutual interference and potential risks. The compartment 20 also helps the modularization of the lithium battery cell group, facilitating the maintenance and replacement of the battery cell 30.

[0041] The elastic fixing device 40 is used for fixing the battery cell 30, and ensures that the battery cell 30 does not move or vibrate due to expansion or contraction during charging and discharging. It can be understood that the battery cell 30 can be stably fixed in the cabin 20 by the elastic fixing device 40, thereby improving the overall stability and reliability of the lithium battery cell group. The elastic fixing device 40 can be a rubber ring or a silica gel ring, which is fixedly connected to the inner side wall of the cabin 20. When the battery cell 30 is placed in the cabin 20, the rubber ring or the silica gel ring will be deformed due to the extrusion of the force, so as to adapt to the shape of the battery cell 30. When the battery cell 30 is completely placed in the cabin 20, the rubber ring or the silica gel ring abuts against the outer circumferential surface of the battery cell 30, thereby achieving the fixation of the battery cell 30. Moreover, since the battery cell 30 is fixed by the elastic fixing device 40, the maintenance and replacement process can be simplified.

[0042] Further, referring to Figure 2 、 Figure 3 In an embodiment of the present application, the top of the cabin 20 is provided with a hatch, and the elastic fixing device 40 comprises an elastic buckle, which is arranged in the cabin 20 and the opening of the elastic buckle faces the hatch direction of the cabin 20. The elastic buckle is in interference fit with the battery cell 30.

[0043] In the technical scheme adopted in this embodiment, the elastic fixing device 40 can also be an elastic buckle. The battery cell 30 passes through the hatch at the top of the cabin 20, so that the battery cell 30 corresponds to the opening of the elastic buckle. The two sides of the elastic buckle are deformed to a certain extent in the direction away from each other under the action of the extrusion force of the battery cell 30 and the elastic force of the elastic buckle, so that the elastic buckle can tightly hold the battery cell 30 and reduce displacement during battery operation. It can be understood that a protruding part is arranged on the inner side of the opening of the elastic buckle. When one end of the battery cell 30 abuts against the elastic buckle, the other end can abut against the protruding part, so that the battery cell 30 is not easy to slide out of the opening of the elastic buckle when vibration occurs. In this embodiment, the hatch is arranged, so that the staff can easily put the battery cell 30 into the cabin 20 or take it out from the cabin 20, and use the elastic buckle for fixation or release.

[0044] Further, referring to Figure 2 In an embodiment of the present application, the cabin 20 is arranged at intervals along the length direction of the shell 10, and at least two cabins 20 are arranged. Each cabin 20 is correspondingly provided with an elastic fixing device 40 and a battery cell 30.

[0045] In the technical scheme adopted in this embodiment, the internal space of the shell 10 can be reasonably utilized, and the uniform distribution of the battery cells 30 in the shell 10 is ensured, which is beneficial to the thermal management and structural stability of the lithium battery cell group. In this embodiment, one elastic fixing device 40 and one battery cell 30 are arranged in one compartment 20, so that each battery cell 30 is independently fixed, the mutual influence between the battery cells 30 can be reduced, and the overall performance of the battery cell group can be improved. In addition, the spacing between the compartments 20 facilitates the effective dissipation of heat inside the lithium battery cell group.

[0046] Further, in an embodiment of the utility model, the lithium battery cell group further comprises a heat dissipation structure, the heat dissipation structure is arranged on the inner surface of the shell 10, and the compartments 20 are in heat transfer connection with the shell 10 through the heat dissipation structure.

[0047] In the technical scheme adopted in this embodiment, the heat of the battery cells 30 can be effectively transferred from the compartments 20 to the shell 10 through the heat dissipation structure, and then dissipated to the environment through the shell 10, so that the heat transfer efficiency can be improved, the heat generated by the battery cells 30 during charging and discharging can be effectively and quickly managed and dissipated, the performance of the battery cells 30 can be maintained, and the service life of the battery cells 30 can be prolonged, thereby improving the overall performance and reliability of the battery cell group. The heat dissipation structure can be a multilayer metal heat conduction sheet with high heat conduction performance, and the opposite sides of the multilayer metal heat conduction sheet are respectively in abutment with the outer side wall of the compartment 20 and the inner wall of the shell 10.

[0048] Further, referring to Figure 2 In an embodiment of the utility model, the heat dissipation structure comprises heat dissipation fins 50 arranged on the inner wall of the shell 10 and in abutment with the compartments 20, and the heat dissipation fins 50 are arranged along the inner circumferential surface of the shell 10.

[0049] In the technical scheme adopted in this embodiment, the heat dissipation structure can further comprise heat dissipation fins 50. The heat dissipation area can be increased, so that the heat transfer efficiency of the lithium battery cell group can be improved, and the risk of local overheating can be reduced. When the battery cells 30 generate heat during operation, the heat can be conducted to the heat dissipation fins 50 through the compartment 20 wall, then conducted to the shell 10, and dissipated to the external environment through the shell 10. The material of the heat dissipation fins 50 is generally a material with high thermal conductivity, such as aluminum or copper, to improve the heat dissipation efficiency. The shape, thickness, height and spacing of the heat dissipation fins 50 can be reasonably designed according to the actual installation of the internal components of the shell 10, which is not limited herein.

[0050] Further, referring to Figure 2 In an embodiment of the utility model, the heat dissipation structure comprises a heat conduction channel arranged between two adjacent compartments 20, and the heat conduction channel is filled with a heat conduction material.

[0051] In the technical scheme adopted in the embodiment, the heat conduction channel is arranged, so that heat can be rapidly diffused in the whole core group, and the heat dissipation efficiency is improved. The heat conduction material filled in the heat conduction channel can be a material with high thermal conductivity, such as graphene, which can effectively absorb and conduct heat and improve the heat dissipation efficiency.

[0052] Further, referring to Figure 4 In an embodiment of the utility model, the lithium battery core group further includes a connecting sheet 60 arranged in the cavity of the shell 10, and the electrodes of each core 30 are fixed by laser welding with the connecting sheet 60.

[0053] In the technical scheme adopted in the embodiment, the connecting sheet 60 is arranged to connect the plurality of cores 30 in series, so as to improve the performance of the lithium battery. The electrodes of the connecting sheet 60 and the core 30 are connected by laser welding, so as to ensure the firmness and low resistance of the connection.

[0054] Further, referring to Figure 1 In an embodiment of the utility model, the connecting sheet 60 includes a conductive layer 61 and an insulating layer 62 arranged on opposite sides of the conductive layer 61, wherein a connecting hole is arranged on one of the insulating layers 62 close to the core 30, and one connecting hole is arranged corresponding to each core 30, so that the electrodes of the core 30 are connected with the conductive layer 61.

[0055] In the technical scheme adopted in the embodiment, the connecting sheet 60 includes the conductive layer 61 and the insulating layer 62. The conductive layer 61 is the core part of the connecting sheet 60, which is usually made of copper, aluminum or other conductive materials, and can connect the electrodes of the core 30 with the external circuit. The insulating layer 62 is used to isolate the conductive layer 61 from the shell 10 or other cores 30, so as to reduce the risk of short circuit. The insulating layer 62 is usually made of plastic, rubber or other insulating materials, and has good electrical insulation performance. It can be understood that the conductive layer 61 is arranged between the two insulating layers 62, so that the risk of short circuit can be reduced even if the connecting sheet 60 is subjected to extrusion or impact, and the safety of the battery core group is improved.

[0056] Further, referring to Figure 2 , ​ In an embodiment of the utility model, one side of the shell 10 is provided with an outlet communicating with the cavity, and the lithium battery core group further includes a connecting interface 70 arranged at the outlet of the shell 10, and one end of the connecting sheet 60 extends to the outside of the shell 10 through the connecting interface 70.

[0057] In the technical scheme adopted in the embodiment, the connecting interface 70 is arranged, so that the lithium battery core group can be connected with the external circuit. In the embodiment, the connecting sheet 60 is an electrical bridge between the internal core 30 and the external circuit.

[0058] Further, in an embodiment of the utility model, the lithium battery core group further comprises a threaded terminal, and the threaded terminal is connected with the connecting interface 70 to adapt to external circuits of different specifications.

[0059] In the technical scheme adopted in this embodiment, the threaded terminal is provided, and different specifications of threaded sizes can be selected according to requirements to adapt to different external circuit connections. The use of the threaded terminal enables the lithium battery core group to be adapted to various devices and application scenarios. In addition, a sealing element is arranged at the connecting interface 70, and the sealing element can be a sealing ring or sealing silica gel, which can reduce the entry of dust and water vapor.

[0060] The above description is merely exemplary embodiments of the utility model, and does not limit the patent range of the utility model, and any equivalent structural transformation made by using the utility model specification and the attached drawings, or direct / indirect application in other related technical fields is included in the patent protection range of the utility model.

Claims

1. A lithium battery cell pack, characterized by, The lithium battery core group comprises: a shell with a cavity inside; compartment, the compartment is arranged in the cavity of the shell, for accommodating the battery core; and elastic fixing device, the elastic fixing device is arranged in the compartment, and the battery core is connected with the compartment through the elastic fixing device.

2. The lithium battery cell pack of claim 1, wherein, The top of the compartment is provided with a hatch, the elastic fixing device comprises an elastic buckle arranged in the compartment, and the opening of the elastic buckle is directed to the hatch direction of the compartment, and the elastic buckle is in interference fit with the battery core.

3. The lithium battery cell pack of claim 1, wherein, The compartments are arranged at intervals along the length direction of the shell, and each compartment is provided with one elastic fixing device and one battery core.

4. The lithium battery cell pack of claim 3, wherein, The lithium battery core group further comprises a heat dissipation structure arranged on the inner surface of the shell, and the compartments are in heat transfer connection with the shell through the heat dissipation structure.

5. The lithium battery cell pack of claim 4, wherein, The heat dissipation structure comprises heat dissipation fins arranged on the inner wall of the shell and abutting against the compartments, and the heat dissipation fins are arranged along the inner circumferential surface of the shell.

6. The lithium battery cell pack of claim 4, wherein, The heat dissipation structure comprises a heat conduction channel arranged between two adjacent compartments, and the heat conduction channel is filled with heat conduction material.

7. The lithium battery cell pack of claim 3, wherein, The lithium battery core group further comprises a connecting sheet arranged in the cavity of the shell, and the electrodes of each battery core are fixed by laser welding with the connecting sheet.

8. The lithium battery cell pack of claim 7, wherein, The connecting sheet comprises a conductive layer and an insulating layer arranged on the opposite sides of the conductive layer, wherein a connecting hole is arranged on one of the insulating layers close to the battery core, and each battery core is provided with a connecting hole to connect the electrodes of the battery core with the conductive layer.

9. The lithium battery cell pack of claim 7, wherein, One side of the shell is provided with an outlet communicating with the cavity, and the lithium battery core group further comprises a connecting interface arranged in the outlet of the shell, one end of the connecting sheet extends to the outside of the shell through the connecting interface.

10. The lithium battery cell pack of claim 9, wherein, The lithium battery core group further comprises a threaded terminal connected with the connecting interface to adapt to different specifications of external circuits.

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