Battery module and battery pack
By using a layered stacked battery module structure and a design that replaces small cells with large cells, the problems of low battery module production efficiency and high risk of poor soldering are solved, resulting in a high energy density and low cost battery module with cell voltage and thermal management capabilities.
Patent Information
- Application Number
- CN202423243848.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-27
- Publication Date
- 2026-01-30
- Estimated Expiration
- 2034-12-27
AI Technical Summary
The large number of cells in existing battery modules leads to low production efficiency, high cost, high risk of poor soldering, difficulty in monitoring cell consistency, and inability of the battery management system to accurately control voltage status.
The battery module structure is stacked in layers. Through the bracket design of the upper and lower battery modules, the cells are connected in series and voltage is monitored by connecting pieces. Large cells are used to replace small cells to reduce the number of cells. Thermal conductive film and insulating film are used to optimize space utilization and thermal management.
It improves battery energy density, reduces the number of cells and production costs, reduces welding defect rate, enables voltage and thermal management of each cell, and improves the reliability and production efficiency of battery modules.
Smart Images
Figure CN223858305U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a battery field especially relates to a battery module and battery package. BACKGROUND
[0002] Current battery module usually uses the arrangement mode of single layer battery module, and multiple small electric cores are connected through series connection and parallel connection. Since the number of series and parallel connection of electric cores in the battery module is numerous, not only the operation efficiency of the whole production process is low, but also the operation cost rises. More seriously, the more the number of electric cores is, the higher the risk of false welding is, and the probability p of the whole battery module being bad caused by false welding of electric cores is N* q produced by continuous work of equipment.
[0003] The electric core parallel connection technology is widely used in the battery module, but also improves the requirement for the consistency of electric cores. The battery management system (BMS) is limited by the technical bottleneck, can only monitor the voltage of each string of electric cores, and cannot be accurate to the voltage state of each electric core, if a section of electric core is abnormal, the voltage cannot be sensitively and quickly transmitted to the BMS, and the BMS cannot effectively control the battery module to realize safety protection. SUMMARY
[0004] The utility model aims at providing a kind of battery module and battery package, optimize space utilization, it is favorable to improve battery energy density.In addition, it is also convenient to reduce the number of electric core used, and then it is favorable to reduce the bad rate of battery module welding.
[0005] In order to realize the above-mentioned purpose, the utility model provides a kind of battery module, including upper layer battery module and lower layer battery module;
[0006] The upper layer battery module includes upper layer support and a plurality of electric cores in upper layer, the upper layer support includes first support and second support, the first support and the second support are oppositely arranged, a plurality of first grooves are formed in the first support and penetrate downward, a plurality of second grooves are formed in the second support and penetrate upward, the first groove and the second groove are one-to-one correspondingly arranged, and are respectively used to accommodate two ends of a plurality of upper layer electric cores;
[0007] The lower layer battery module includes lower layer support and a plurality of electric cores in lower layer, the lower layer support includes third support and fourth support, the third support and the fourth support are oppositely arranged, a plurality of third grooves are formed in the third support and penetrate downward, a plurality of fourth grooves are formed in the fourth support and penetrate upward, the third groove and the fourth groove are one-to-one correspondingly arranged, and are respectively used to accommodate two ends of a plurality of lower layer electric cores;
[0008] The second support is fixedly arranged on the third support, so that the upper layer battery module is stacked on the lower layer battery module.
[0009] Optionally, the upper end face and the lower end face of the upper layer battery module and the upper end face and the lower end face of the lower layer battery module are provided with a plurality of connecting pieces, the connecting pieces are used to connect the end electrodes of two battery cells, and each battery cell is electrically connected together through the connecting pieces on the upper end face and the lower end face of the upper layer battery module and the upper end face and the lower end face of the lower layer battery module.
[0010] Optionally, the bottom wall of the first groove is formed with a first through hole penetrating upward and downward, the bottom wall of the second groove is formed with a second through hole penetrating upward and downward, and the connecting piece is welded with the end electrode of the battery cell in the upper layer through the first through hole and the second through hole;
[0011] The bottom wall of the third groove is formed with a third through hole penetrating upward and downward, the bottom wall of the fourth groove is formed with a fourth through hole penetrating upward and downward, and the connecting piece is welded with the end electrode of the battery cell in the lower layer through the third through hole and the fourth through hole.
[0012] Optionally, the two battery cells in the same layer connected by the same connecting piece are placed in opposite directions, and a plurality of battery cells in the upper layer and a plurality of battery cells in the lower layer are connected in series through the connecting pieces, wherein one connecting piece of the upper layer battery module and one connecting piece of the lower layer battery module are welded together to realize the series connection of the upper layer battery module and the lower layer battery module.
[0013] Optionally, the upper end face of the upper layer battery module, the lower end face of the lower layer battery module, and the lower end face of the upper layer battery module and the upper end face of the lower layer battery module are provided with heat-conducting adhesive sheets, and the heat-conducting adhesive sheets are connected or contacted with the connecting pieces, respectively.
[0014] Optionally, the lower end face of the upper layer battery module and the upper end face of the lower layer battery module are further provided with an insulating sheet.
[0015] Optionally, at least part of the heat-conducting adhesive sheets are fixed with the thermal sensitive heads of NTC, the upper layer support and the lower layer support are provided with through holes penetrating upward and downward, and the through holes are used for passing the lead wires of NTC.
[0016] Optionally, the second support protrudes downward with a first plug-in column, the third support is formed with a first insertion hole, and the first plug-in column is adapted to be plugged into the first insertion hole; and / or,
[0017] The second support is formed with a second insertion hole, the third support protrudes upward with a second plug-in column, and the second plug-in column is adapted to be plugged into the second insertion hole.
[0018] Optionally, the structure of the first support and the structure of the fourth support are the same; and / or,
[0019] The structure of the second support and the structure of the third support are the same.
[0020] To achieve the above object, the utility model provides a battery pack, including the battery module as mentioned above.
[0021] In the embodiment of the utility model, the battery module includes upper layer battery module and lower layer battery module, the upper layer battery module includes upper layer support and a plurality of electricities in upper layer, the lower layer battery module includes lower layer support and a plurality of electricities in lower layer, the upper layer support includes first support and second support, and a plurality of first recesses and a plurality of second recesses that are arranged one by one are formed on the first support and the second support respectively to accommodate a plurality of electricities in upper layer, the lower layer support includes third support and fourth support, and a plurality of third recesses and a plurality of fourth recesses that are arranged one by one are formed on the third support and the fourth support respectively to accommodate a plurality of electricities in lower layer, and the second support is fixedly arranged on the third support to realize the connection between the upper layer battery module and the lower layer battery module. The utility model discloses a battery module is arranged in layers and is stacked, and space utilization is optimized, which is conducive to improving the battery energy density. In addition, since the arrangement mode is changed, large electricities can be used instead of small electricities, and then the number of electricities used by the battery module can be reduced, and the defective rate of the battery module welding can be reduced. BRIEF DESCRIPTION OF DRAWINGS
[0022] Figure 1 It is a three-dimensional structure schematic view of the battery module in the embodiment of the utility model.
[0023] Figure 2 It is a three-dimensional structure schematic view of the upper layer support and the lower layer support in the embodiment of the utility model.
[0024] Figure 3 It is an exploded structure schematic view of the battery module in the embodiment of the utility model.
[0025] Figure 4 It is a three-dimensional structure schematic view of the battery module in another embodiment of the utility model. DETAILED DESCRIPTION
[0026] To achieve the above object, the utility model provides a battery pack, including the battery module as mentioned above.
[0027] For the above purposes, features and advantages of the present application to be more apparent and understandable, the specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, a number of specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be practiced in a number of different manners other than those described herein, and those skilled in the art can make similar improvements without departing from the spirit of the present application, therefore the present application is not limited to the specific embodiments disclosed below.
[0028] In the description of the present application, 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 mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.
[0029] In the present application, unless otherwise explicitly specified and limited, the "upper" or "lower" of the first feature to the second feature can include the direct contact of the first and second features, or can include the contact of the first and second features through another feature between them. Moreover, the "upper", "upper" and "upper" of the first feature to the second feature include the vertical and oblique above of the first feature to the second feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The "below", "below" and "below" of the first feature to the second feature include the vertical and oblique below of the first feature to the second feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.
[0030] In the description of the present embodiment, the terms "upper", "lower", "left", "right" and other orientation or position relationship are based on the orientation or position relationship shown in the drawings, only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, therefore it 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.
[0031] Please refer to Figures 1 to 4 The utility model discloses a kind of battery module 1, including upper layer battery module 10 and lower layer battery module 20.
[0032] The upper layer battery module 10 comprises an upper layer support 11 and a plurality of battery cells 30 located at the upper layer.
[0033] The lower layer battery module 20 comprises a lower layer support 21 and a plurality of battery cells 30 located at the lower layer.
[0034] The second support 13 is fixedly arranged on the third support 22, so that the upper layer battery module 10 is stacked on the lower layer battery module 20.
[0035] In the embodiment of the utility model, the battery module 1 comprises an upper layer battery module 10 and a lower layer battery module 20, the upper layer battery module 10 comprises an upper layer support 11 and a plurality of battery cells 30 located at the upper layer, the lower layer battery module 20 comprises a lower layer support 21 and a plurality of battery cells 30 located at the lower layer, the upper layer support 11 comprises a first support 12 and a second support 13, a plurality of first recesses 14 and a plurality of second recesses 15 are formed on the first support 12 and the second support 13 respectively and are arranged in one-to-one correspondence to accommodate the plurality of battery cells 30 at the upper layer, the lower layer support 21 comprises a third support 22 and a fourth support 23, a plurality of third recesses 24 and a plurality of fourth recesses 25 are formed on the third support 22 and the fourth support 23 respectively and are arranged in one-to-one correspondence to accommodate the plurality of battery cells 30 at the lower layer, and the second support 12 is fixedly arranged on the third support 13 to realize the connection of the upper layer battery module 10 and the lower layer battery module 20. The utility model discloses a battery module 1 is arranged in layers, which optimizes the space utilization and is conducive to improving the battery energy density. In addition, since the arrangement mode is changed, large battery cells can be used instead of small battery cells, thereby the number of battery cells 30 used by the battery module 1 can be reduced, and the defective rate of the battery module 1 welding can be reduced.
[0036] In addition, under the same battery energy, the structure of the battery module 1 of the utility model is conducive to reducing the size and material of each support structure, the cost is lower, and the cost of each support mold opening is also lower.
[0037] In some embodiments, the upper end face and the lower end face of the upper battery module 10 and the upper end face and the lower end face of the lower battery module 20 are connected with a plurality of connecting pieces 40, the connecting pieces 40 are used to connect the end electrodes of two battery cells 30, and each battery cell 30 is electrically connected together by the connecting pieces 40 on the upper end face and the lower end face of the upper battery module 10 and the upper end face and the lower end face of the lower battery module 20.
[0038] The two ends of the upper battery cell 30 are respectively welded with a connecting piece 40 on the upper end face and the lower end face of the upper support 11, and the two ends of the lower battery cell 30 are respectively welded with a connecting piece 40 on the upper end face and the lower end face of the lower support 21.
[0039] Please refer to Figure 2 Specifically, the bottom wall of the first recess 14 is formed with a first through hole 16 penetrating upward and downward, the bottom wall of the second recess 15 is formed with a second through hole 17 penetrating upward and downward, and the connecting piece 40 is welded with the end electrode of the upper battery cell 30 through the first through hole 16 and the second through hole 17.
[0040] The bottom wall of the third recess 24 is formed with a third through hole 26 penetrating upward and downward, the bottom wall of the fourth recess 25 is formed with a fourth through hole 27 penetrating upward and downward, and the connecting piece 40 is welded with the end electrode of the lower battery cell 30 through the third through hole 26 and the fourth through hole 27.
[0041] Specifically, the two battery cells 30 on the same layer connected by the same connecting piece 40 are placed in opposite directions, and the plurality of upper battery cells 30 and the plurality of lower battery cells 30 are respectively connected in series by the connecting pieces 40, wherein one connecting piece 40 of the upper battery module 10 and one connecting piece 40 of the lower battery module 20 are welded together to realize the series connection of the upper battery module 10 and the lower battery module 20. The battery cells 30 of the upper battery module 10 and the lower battery module 20 are connected in series by the connecting pieces 40, which is conducive to reducing the number of battery cells 30 and enabling the BMS to monitor the voltage of each battery cell 30, facilitating battery management and improving the reliability of the battery module 1.
[0042] Specifically, the connecting piece 40 is a nickel piece.
[0043] Please refer to Figure 2 In some embodiments, the second support 13 protrudes downward with a first plug-in column 131, the third support 22 is formed with a first insertion hole 221, and the first plug-in column 131 is adapted to be plugged into the first insertion hole 221.
[0044] In some embodiments, the second support 13 is formed with a second insertion hole 132, the third support 22 protrudes upward with a second plug-in column 232, and the second plug-in column 232 is adapted to be plugged into the second insertion hole 132.
[0045] Through the cooperation of the plug-in convex column and the plug-in hole, quick plug-in assembly is facilitated, and when problems occur, the battery module 1 can be conveniently disassembled and repaired. It can be understood that the plug-in convex column can be arranged in one of the second support 13 and the third support 22, and the plug-in hole matched therewith can be arranged in the other one, or both of them can be provided with the plug-in convex column and the plug-in hole. The utility model does not limit this.
[0046] Specifically, the structure of the first support 12 is the same as that of the fourth support 23.
[0047] Using the supports with the same structure is beneficial to reduce the cost of mold manufacturing. Of course, the utility model does not limit this.
[0048] Specifically, the structure of the second support 13 is the same as that of the third support 22.
[0049] Using the supports with the same structure is beneficial to reduce the cost of mold manufacturing. Of course, the utility model does not limit this.
[0050] Please refer to Figure 3 In some embodiments, the upper end face of the upper layer battery module 10, the lower end face of the lower layer battery module 20, and the lower end face of the upper layer battery module 10 and the upper end face of the lower layer battery module 20 are all provided with the heat-conducting sheet 50, which is connected or contacted with the connecting sheet 40.
[0051] Due to the stacking arrangement of the battery module 1, the end face area of the upper layer battery module 10 and the lower layer battery module 20 and the area of the heat-conducting sheet 50 are reduced, and the heat change is quickly conducted.
[0052] Specifically, the lower end face of the upper layer battery module 10 and the upper end face of the lower layer battery module 20 are also provided with the insulating sheet 60. The insulating sheet 60 and the heat-conducting sheet 50 are arranged between the lower end face of the upper layer battery module 10 and the upper end face of the lower layer battery module 20, which not only accelerates the heat conduction of the end face of the battery cell 30, but also realizes the insulation of the upper layer battery module 10 and the lower layer battery module 20.
[0053] Specifically, the heat-conducting sheet 50 is formed with the first avoiding hole 51 allowing the wire harness and the plug-in convex column to pass through, and the insulating sheet 60 is formed with the second avoiding hole 61 allowing the wire harness and the plug-in convex column to pass through.
[0054] In some embodiments, at least part of the heat-conducting sheet 50 is fixed with the thermal sensitive head (not shown in the figure) of NTC, and the upper layer support 11 and the lower layer support 21 are provided with the wire passing hole 60 penetrating upward and downward, which is used for the lead wire of NTC to pass through. Through the arrangement of the wire passing hole 60, the wire harness of BMS can be allowed to pass through, the wire harness is fixed, and the wire harness is protected from being extruded.
[0055] In a specific example, by leading out two temperature sensor NTC leads from the BMS board, and connecting the thermal sensitive heads of the two NTCs to the heat-conducting adhesive sheet 50 on the upper end face of the upper battery module 10 and the lower end face of the lower battery module 20 respectively, the thermal changes of each battery cell 30 can be quickly conducted to the NTCs on the heat-conducting adhesive sheet 50, so that the thermal management of each battery cell 30 of the battery module 1 can be realized.
[0056] Referring to Figure 1 In some embodiments, the total number of battery cells 30 is 14, and the number of battery cells 30 in the upper layer and the lower layer is 7.
[0057] Referring to Figure 4 In some embodiments, the total number of battery cells 30 is 13, and the number of battery cells 30 in the upper layer is 7 and the number of battery cells 30 in the lower layer is 6.
[0058] It should be understood that the utility model uses large battery cells with higher battery energy density to replace small battery cells, for example, the battery module 1 with 48V13Ah, the battery energy of 13 large battery cells = 48V13Ah = 65 small battery cells, under the condition of not changing the overall size of the battery module 1, using fewer battery cells 30 to achieve the same battery energy. The cost of each small battery cell is 5 yuan, the cost of using 65 small battery cells is 65*5 = 325 (yuan), the cost of each large battery cell is 19 yuan, and the cost of using 13 large battery cells is 13*19 = 266 (yuan), which can reduce the battery cell cost by 78 yuan, thereby reducing the production cost of the battery module 1. And because the number of battery cells 30 is reduced, it is beneficial to improve the production efficiency of the battery pack, and also greatly reduces the failure rate of the welding of the battery module 1.
[0059] In addition, in the same volume space, when 14 large battery cells are used, the battery energy is higher than that of the battery module 1 using 65 small battery cells, effectively improving the energy density of the battery.
[0060] It should be understood that in the actual design process, the battery module 1 can increase the number of layers of the battery module 1 by increasing the combination of the second support 13 and the third support 22 connected and the number of layers of the battery cell 30 as needed, and the utility model does not elaborate on this.
[0061] The utility model also discloses a battery pack, which comprises the battery module 1 as described above. The battery pack has high energy density and is suitable for the field of electric bicycles.
[0062] The above disclosed is only a preferred example of the utility model, and its role is to facilitate the understanding and implementation of the skilled in the art, and of course cannot limit the scope of the utility model right, therefore, the equivalent changes made according to the utility model patent range still belong to the scope covered by the utility model.
Claims
1. A battery module, characterized by, The battery module comprises an upper layer battery module and a lower layer battery module. The upper layer battery module comprises an upper layer support and a plurality of battery cells in the upper layer. The upper layer support comprises a first support and a second support. The first support and the second support are oppositely arranged.
2. The battery module of claim 1, wherein, A plurality of first grooves are formed on the first support and penetrate downward.
3. The battery module of claim 2, wherein, A plurality of second grooves are formed on the second support and penetrate upward. The first grooves and the second grooves are arranged in one-to-one correspondence.
4. The battery module of claim 2 or 3, wherein, The first grooves and the second grooves are respectively used for accommodating two ends of the plurality of battery cells in the upper layer.
5. The battery module of claim 2, wherein, The lower layer battery module comprises a lower layer support and a plurality of battery cells in the lower layer.
6. The battery module of claim 5, wherein, The lower layer support comprises a third support and a fourth support.
7. The battery module of claim 5, wherein, The third support and the fourth support are oppositely arranged. A plurality of third grooves are formed on the third support and penetrate downward. A plurality of fourth grooves are formed on the fourth support and penetrate upward. The third grooves and the fourth grooves are arranged in one-to-one correspondence. The third grooves and the fourth grooves are respectively used for accommodating two ends of the plurality of battery cells in the lower layer. The second support is fixedly arranged on the third support. The upper layer battery module is stacked on the lower layer battery module. The upper end surface and the lower end surface of the upper layer battery module and the upper end surface and the lower end surface of the lower layer battery module are provided with a plurality of connecting pieces. The connecting pieces are used for connecting end electrodes of the two battery cells. The connecting pieces are electrically connected together through the connecting pieces on the upper end surface and the lower end surface of the upper layer battery module and the upper end surface and the lower end surface of the lower layer battery module. The bottom wall of the first groove is formed with a first through hole penetrating upward and downward. The bottom wall of the second groove is formed with a second through hole penetrating upward and downward. The connecting pieces are welded with end electrodes of the battery cells in the upper layer through the first through hole and the second through hole. The bottom wall of the third groove is formed with a third through hole penetrating upward and downward. The bottom wall of the fourth groove is formed with a fourth through hole penetrating upward and downward. The connecting pieces are welded with end electrodes of the battery cells in the lower layer through the third through hole and the fourth through hole. The two battery cells in the same layer connected by the same connecting piece are placed in opposite directions. The plurality of battery cells in the upper layer and the plurality of battery cells in the lower layer are connected in series through the connecting pieces. One connecting piece of the upper layer battery module and one connecting piece of the lower layer battery module are welded together to realize series connection of the upper layer battery module and the lower layer battery module. The upper end surface of the upper layer battery module, the lower end surface of the lower layer battery module, and the upper end surface of the upper layer battery module and the lower end surface of the lower layer battery module are provided with heat-conducting adhesive pieces. The heat-conducting adhesive pieces are connected or contacted with the connecting pieces. The lower end surface of the upper layer battery module and the upper end surface of the lower layer battery module are further provided with insulating pieces. NTC thermal sensitive heads are fixed on at least part of the heat-conducting adhesive pieces. The upper layer support and the lower layer support are provided with through holes penetrating upward and downward. The through holes are used for passing through leads of the NTC.
8. The battery module of claim 1, wherein The second support protrudes downward with a first plug protrusion, the third support is formed with a first plug hole, and the first plug protrusion is adapted to be plugged into the first plug hole; and / or, The second support is formed with a second plug hole, the third support protrudes upward with a second plug protrusion, and the second plug protrusion is adapted to be plugged into the second plug hole.
9. The battery module of claim 8, wherein: The first support and the fourth support have the same structure; and / or The second support and the third support have the same structure.
10. A battery pack, characterized by, A battery module as claimed in any one of claims 1 to 9.