Battery pack and electric equipment

Abstract

The utility model provides a battery pack and electric equipment, the battery pack includes box body, a plurality of battery module and a plurality of first connecting piece, the plurality of battery modules are distributed in the box body at interval and are all connected with the bottom of the box body, the battery module has a first end face departing from the bottom of the box body, the first connecting piece is clamped between every two adjacent battery modules, and the first connecting piece is connected with the first end face of the box body. The first connecting piece is used for fixing the two adjacent battery modules into a whole, the first connecting piece is provided with a second end face deviating from the bottom of the box body, the second end face is located between the first end face and the bottom of the box body, the distance between the second end face and the first end face is L1, and L1 is larger than or equal to 20 mm and smaller than or equal to 30 mm, so that shear stress transmitted to the tops of the battery modules is small, and the service life of the battery modules is prolonged. Therefore, the stress can be prevented from excessively pulling the welding seam of the battery cell, and finally the welding seam of the battery cell of the battery module is prevented from cracking.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to battery packs and electrical equipment. Background Technology

[0002] A battery pack typically includes a housing and multiple battery modules housed within the housing. Each battery module comprises multiple battery cells arranged sequentially. In related technologies, adhesive is used to fill the gaps between adjacent battery modules to bond and secure them together, thereby improving the rigidity of the battery pack. However, during use, when the battery pack vibrates, problems arise such as the adhesive tearing the weld seams of the battery cells, leading to leakage. Utility Model Content

[0003] The present invention provides a battery pack and electrical equipment, which aims to solve the problems in related technologies where, when the battery pack vibrates, the adhesive parts tear the weld seams of the battery cells, leading to leakage of the battery cells.

[0004] In a first aspect, embodiments of the present invention provide a battery pack.

[0005] In one embodiment, the battery pack includes:

[0006] Box;

[0007] Multiple battery modules are spaced apart inside the housing and are all connected to the bottom of the housing. Each battery module has a first end face that faces away from the bottom of the housing.

[0008] Multiple first connectors are provided, with each first connector sandwiched between two adjacent battery modules. The first connectors are used to fix two adjacent battery modules into one unit. Each first connector has a second end face facing away from the bottom of the housing. The second end face is located between the first end face and the bottom of the housing, and the distance between the second end face and the first end face is L1, where 20mm≤L1≤30mm.

[0009] In one embodiment, the first connector is bonded and fixed to two adjacent battery modules; and / or,

[0010] The battery pack also includes structural adhesive, and the battery module is bonded and fixed to the bottom of the housing by the structural adhesive.

[0011] In one embodiment, the first connector includes expanding foam.

[0012] In one embodiment, the distance between two adjacent battery modules is L2, wherein 3mm≤L2≤10mm.

[0013] In one embodiment, the plurality of battery modules include a plurality of first battery modules, and the sidewalls of the plurality of first battery modules are disposed opposite to the sidewalls of the housing;

[0014] The battery pack also includes a plurality of second connectors, and the first battery module is bonded and fixed to the corresponding side wall of the housing through the second connectors.

[0015] In one embodiment, the second connector includes expanding foam.

[0016] In one embodiment, the first battery module has a third end face disposed opposite to the bottom of the housing;

[0017] The second connector has a fourth end face that is disposed away from the bottom of the housing. The fourth end face is located between the third end face and the bottom of the housing. The distance between the fourth end face and the third end face is L3, wherein 20mm≤L3≤30mm.

[0018] In one embodiment, the battery module includes a plurality of battery cells arranged at intervals in sequence;

[0019] The battery pack also includes multiple elastic connectors, with the elastic connectors sandwiched between two adjacent battery cells.

[0020] In one embodiment, the elastic connector is bonded and fixed between two adjacent battery cells.

[0021] In one embodiment, the resilient connector includes foam.

[0022] In one embodiment, the battery cell includes a housing and an insulating film covering the housing. The insulating film includes a membrane segment disposed corresponding to the sidewall of the housing, and the membrane segment is provided with a notch. The first connector and / or the elastic connector between two adjacent battery cells are adapted to pass through the notch and connect to the housing of the two battery cells.

[0023] Secondly, this application also provides an electrical device, which includes a battery pack as described above.

[0024] The beneficial effects of the embodiments of this utility model are as follows:

[0025] In this embodiment of the invention, since the weld seam of the battery cell is located at the top of the battery module, and the distance between the second end face of the first connector and the first end face of the battery module is limited to between 20mm and 30mm, an unconnected free area is formed at the upper end of the battery module. When the battery pack vibrates, shear stress is generated at the connection point of the battery module through the first connector. Due to the existence of the free area, the shear stress transmitted to the top of the battery module is smaller, thereby preventing excessive stretching of the cell weld seam by the stress and ultimately avoiding the problem of cell leakage caused by cracking of the cell weld seam. This design also enhances the structural stability of the battery module and significantly improves the safety and reliability of the battery pack during use. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the battery pack provided in an embodiment of the present invention;

[0028] Figure 2 yes Figure 1 A magnified view of part A shown below;

[0029] Figure 3 yes Figure 1 A magnified view of part B shown;

[0030] Figure 4 yes Figure 1 A schematic diagram of the battery pack (partial structure) shown;

[0031] Figure 5 yes Figure 4 A top view of the battery pack (partial structure) shown;

[0032] Figure 6 yes Figure 5 A magnified view of the area at point C is shown below;

[0033] Figure 7 This is a schematic diagram of the battery cell structure provided in an embodiment of this utility model.

[0034] Explanation of reference numerals in the attached figures:

[0035] 100. Battery pack; 10. Housing; 20. Battery module; 21. First end face; 22. First battery module; 23. Battery cell; 231. Housing; 232. Insulating film; 233. Notch; 30. First connector; 31. Second end face; 40. Structural adhesive; 50. Second connector; 60. Elastic connector. Detailed Implementation

[0036] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of the present utility model and are not intended to limit the present utility model. In the present utility model, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0037] A battery pack typically includes a housing and multiple battery modules housed within the housing. Each battery module comprises multiple battery cells arranged sequentially. In related technologies, adhesive is used to fill the gaps between adjacent battery modules to bond and secure them together, thereby improving the rigidity of the battery pack. However, during use, when the battery pack vibrates, problems arise such as the adhesive tearing the weld seams of the battery cells, leading to leakage.

[0038] In view of this, the present invention proposes a battery pack, Figures 1 to 7 This is a schematic diagram of an embodiment of the battery pack provided by this utility model. The battery pack provided by this utility model avoids the problem of cell weld cracking caused by battery pack vibration, resulting in cell leakage. The battery pack will be described in detail below with reference to the main accompanying drawings.

[0039] Reference Figure 1 and Figure 2The battery pack 100 includes a housing 10, multiple battery modules 20, and multiple first connectors 30. The multiple battery modules 20 are spaced apart inside the housing 10 and are all connected to the bottom of the housing 10. Each battery module 20 has a first end face 21 facing away from the bottom of the housing 10. A first connector 30 is sandwiched between two adjacent battery modules 20. The first connector 30 is used to fix two adjacent battery modules 20 into one unit. The first connector 30 has a second end face 31 facing away from the bottom of the housing 10. The second end face 31 is located between the first end face 21 and the bottom of the housing 10, and the distance between the second end face 31 and the first end face 21 is L1, where 20mm≤L1≤30mm.

[0040] In this embodiment of the invention, since the weld of the battery cell 23 is located at the top of the battery module 20, and the distance between the second end face 31 of the first connector 30 and the first end face 21 of the battery module 20 is limited to between 20mm and 30mm, an unconnected free area is formed at the upper end of the battery module 20. When the battery pack 100 vibrates, shear stress will be generated at the connection point of the battery module 20 through the first connector 30. Due to the existence of the free area, the shear stress transmitted to the top of the battery module 20 will be smaller, thereby preventing excessive stretching of the weld of the battery cell 23 by the stress, and ultimately avoiding the problem of leakage of the battery cell 23 due to cracking of the weld of the battery cell 23 in the battery module 20. This design also enhances the structural stability of the battery module 20 and significantly improves the safety and reliability of the battery pack 100 during use.

[0041] It should be noted that the distance between the second end face 31 and the first end face 21 can be selected as needed. For example, the distance between the second end face 31 and the first end face 21 can be 20mm, 22mm, 25mm, 27mm, 29mm or 30mm, etc. Specifically, this application does not limit this.

[0042] Reference Figure 4 and Figure 5 In one embodiment, the first connector 30 is bonded and fixed to two adjacent battery modules 20. This bonding and fixing of adjacent battery modules 20 with the first connector 30 significantly enhances the connection strength between the battery modules 20, thereby improving the rigidity and structural stability of the entire battery pack 100. Using the first connector 30 for bonding and fixing greatly simplifies the assembly process and reduces production costs.

[0043] It should be noted that, in other embodiments, the first connector 30 can also snap-fit, screw-fit, or weld two adjacent battery modules 20 together. Specifically, this application does not limit this.

[0044] Specifically, the first connector 30 includes expanding foam. As a high-strength adhesive, the expanding foam can firmly bond adjacent battery modules 20 together, forming a stable connection structure. This connection method offers higher connection strength and better durability compared to traditional mechanical connections (such as bolts and rivets), effectively preventing displacement or loosening of the battery modules 20 under vibration or impact conditions, thus ensuring the overall stability and safety of the battery pack 100. Using expanding foam as the first connector 30 greatly simplifies the assembly process of the battery pack 100. Compared to traditional connection methods, expanding foam eliminates the need for complex drilling, tapping, and other processing steps, as well as additional fasteners and installation tools, thereby reducing production costs and assembly difficulty. Furthermore, the use of expanding foam can reduce the overall weight of the battery pack 100, which is beneficial for improving energy efficiency and driving range in applications such as electric vehicles. The foam-like structure formed after the expanding foam cures has certain heat insulation and sound insulation effects. This helps reduce the heat and noise generated by the battery pack 100 during operation, improving ride comfort and safety in applications such as electric vehicles. The foam has a certain degree of elasticity, which can absorb and disperse vibration energy and reduce stress concentration in the battery pack 100 in a vibration environment. This helps to reduce the risk of the weld of the cell 23 cracking due to vibration, thereby improving the reliability and safety of the battery pack 100.

[0045] It should be noted that the type of the first connector 30 can be selected as needed. For example, the first connector 30 may also include structural adhesive 40 or double-sided tape, etc. Specifically, this application does not limit the specific type of the first connector 30.

[0046] Reference Figure 1 and Figure 5 In one embodiment, the distance between two adjacent battery modules 20 is L2, where 3mm ≤ L2 ≤ 10mm. Thus, a distance between two adjacent battery modules 20 in the range of 3mm to 10mm not only facilitates airflow between the battery modules 20, thereby improving heat dissipation, but also increases the volumetric energy density of the battery pack 100. When the battery pack 100 is subjected to vibration or impact, a distance between two adjacent battery modules 20 in the range of 3mm to 10mm can provide a certain buffering effect, reducing direct collisions and stress concentration between the battery modules 20, thereby improving the overall structural stability of the battery pack 100. A distance between two adjacent battery modules 20 in the range of 3mm to 10mm can prevent short circuits caused by contact between metal components of the battery modules 20, improving the safety of the battery pack 100.

[0047] Furthermore, the distance between two adjacent battery modules 20 directly affects the volume utilization rate of the battery pack 100. When the distance between two adjacent battery modules 20 is greater than 10mm, the volume of the battery pack 100 will increase, reducing the volumetric energy density; when the distance between two adjacent battery modules 20 is less than 3mm, it may affect the heat dissipation and safety of the battery modules 20.

[0048] It should be noted that the distance between two adjacent battery modules 20 is between 3mm and 10mm, which also facilitates the filling of expanding foam.

[0049] Reference Figure 3 In one embodiment, the battery pack 100 further includes structural adhesive 40, which is used to bond and fix the battery module 20 to the bottom of the housing 10. Thus, the structural adhesive 40, as a high-strength adhesive, can firmly bond the battery module 20 to the bottom of the housing 10, providing stable mechanical support. Compared with traditional metal connectors, the use of structural adhesive 40 can significantly reduce the weight of the battery pack 100, which is beneficial to improving the driving range and energy efficiency of electric vehicles. The bonding process of structural adhesive 40 is relatively simple, which helps to improve production efficiency. Structural adhesive 40 has a certain degree of elasticity, which can absorb and disperse vibration energy to a certain extent, reducing stress concentration in the battery pack 100 in a vibration environment and improving its shock resistance.

[0050] Reference Figure 5 In one embodiment, the plurality of battery modules 20 includes a plurality of first battery modules 22, the sidewalls of which are disposed opposite to the sidewalls of the housing 10. The battery pack 100 also includes a plurality of second connectors 50, and the first battery modules 22 are bonded and fixed to the corresponding sidewalls of the housing 10 via the second connectors 50. Thus, bonding and fixing the sidewalls of the first battery modules 22 to the sidewalls of the housing 10 via the second connectors 50 helps prevent the battery modules 20 from shifting or loosening under vibration or impact conditions, significantly improving the overall rigidity and structural stability of the battery pack 100. The bonding and fixing via the second connectors 50 ensures good contact between the battery modules 20 and the housing 10, allowing heat from the battery modules 20 to be transferred to the housing 10, thereby improving the heat dissipation efficiency of the battery modules 20 and extending the battery's lifespan. Using the second connectors 50 for bonding and fixing greatly simplifies the assembly process, which helps reduce production costs and improve production efficiency. Compared with traditional metal connectors, the use of the second connector 50 can significantly reduce the weight of the battery pack 100, which is beneficial to improving the driving range and energy efficiency of electric vehicles.

[0051] Specifically, the second connector 50 includes expanding foam. As a high-strength adhesive, expanding foam can firmly bond the battery module 20 to components such as the side walls of the housing 10, forming a stable connection structure. This connection method has higher connection strength and better durability compared to traditional mechanical connections (such as bolts and rivets), effectively preventing the battery module 20 from shifting or loosening under vibration or impact conditions, thus ensuring the overall stability and safety of the battery pack 100. Using expanding foam as the second connector 50 greatly simplifies the assembly process of the battery pack 100. Compared to traditional connection methods, expanding foam eliminates the need for complex drilling, tapping, and other processing steps, as well as additional fasteners and installation tools, thereby reducing production costs and assembly difficulty. Furthermore, the use of expanding foam can reduce the overall weight of the battery pack 100, which is beneficial for improving energy efficiency and driving range in applications such as electric vehicles. The foam-like structure formed after the expanding foam cures has certain heat insulation and sound insulation effects. This helps reduce the heat and noise generated by the battery pack 100 during operation, improving ride comfort and safety in applications such as electric vehicles. The foam has a certain degree of elasticity, which can absorb and disperse vibration energy, reducing stress concentration in the battery pack 100 in a vibrating environment. This helps reduce the risk of the weld seam of the battery cell 23 cracking due to vibration, thereby improving the reliability and safety of the battery pack 100.

[0052] It should be noted that the type of the second connector 50 can be selected as needed. For example, the second connector 50 may also include structural adhesive 40 or double-sided adhesive, etc. Specifically, this application does not limit this.

[0053] In one embodiment, the first battery module 22 has a third end located away from the bottom of the housing 10, and the second connector 50 has a fourth end face located away from the bottom of the housing 10. The fourth end face is located between the third end and the bottom of the housing 10, and the distance between the fourth end face and the third end is L3, where 20mm ≤ L3 ≤ 30mm. Since the weld of the cell 23 is located at the top of the battery module 20, by limiting the distance between the third end and the fourth end face to between 20mm and 30mm, an unconnected free area is formed at the upper end of the battery module 20. When the battery pack 100 vibrates, shear stress will be generated at the connection point of the battery module 20 through the second connector 50. However, due to the existence of the free area, a smaller shear stress will be transmitted to the top of the battery module 20, thereby preventing the stress from excessively stretching the weld of the cell 23, and ultimately avoiding the problem of leakage of the cell 23 due to cracking of the weld of the cell 23 in the battery module 20. This design also enhances the structural stability of the battery module 20 and significantly improves the safety and reliability of the battery pack 100 during use.

[0054] Reference Figure 6In one embodiment, the battery module 20 includes a plurality of battery cells 23 arranged at intervals in sequence, and the battery pack 100 also includes a plurality of elastic connectors 60, with an elastic connector 60 sandwiched between two adjacent battery cells 23. Thus, the elastic connectors 60 act as buffers and absorb expansion forces between the battery cells 23. During the use of the battery module 20, the battery cells 23 will expand to a certain extent due to charging, discharging, and temperature changes. The elastic connectors 60 can absorb and disperse this expansion force, preventing direct compression and deformation between the battery cells 23, thereby reducing the expansion force at the end of the battery module 20's lifespan and helping to extend the battery module 20's lifespan. The presence of the elastic connectors 60 ensures that the spacing between adjacent battery cells 23 remains uniform. Even if the battery cells 23 undergo slight dimensional changes during charging and discharging, the elastic connectors 60 can adapt to these changes through their elastic deformation, maintaining a stable spacing between the battery cells 23, thereby reducing the internal stress caused by uneven expansion of the battery cells 23. The elastic connector 60 not only buffers and absorbs expansion forces, but also enhances the structural stability of the battery module 20 through its elastic deformation. When the battery pack 100 is subjected to external impact or vibration, the elastic connector 60 can absorb some energy, preventing relative movement and collisions between the cells 23, thereby maintaining the overall structural stability of the battery module 20. By sandwiching the elastic connector 60 between the cells 23, a more compact and stable battery module 20 structure can be formed. This structure helps to improve the rigidity of the entire battery pack 100, making it more robust and durable when facing external impacts or vibrations.

[0055] In one embodiment, the elastic connector 60 is bonded and fixed to two adjacent battery cells 23. This bonding and fixing allows for a strong connection between the elastic connector 60 and the battery cells 23. This connection is not only stable and reliable but also effectively prevents the battery cells 23 from loosening or shifting due to vibration or impact during use, which helps improve the overall structural stability of the battery module 20. The bonding and fixing method simplifies the assembly process of the battery module 20, reduces production costs, and improves assembly efficiency. During the use of the battery module 20, the dimensions of the battery cells 23 may undergo slight changes due to charging, discharging, and temperature variations. Through bonding and fixing, the elastic connector 60 can adapt to these dimensional changes, maintaining close contact with the battery cells 23. This helps prevent internal stress concentration and relative displacement between the battery cells 23 caused by dimensional changes.

[0056] It should be noted that the type of elastic connector 60 can be selected as needed. For example, in the embodiments of this application, the elastic connector 60 includes foam. In other embodiments, the elastic connector 60 may also include rubber pads, polyurethane foam boards, or silicone pads, etc. Specifically, this application does not limit this.

[0057] Reference Figure 7 In one embodiment, the battery cell 23 includes a housing 231 and an insulating film 232 covering the housing 231. The insulating film 232 includes film segments corresponding to the sidewalls of the housing 231. By providing notches 233 in the film segments, a first connector 30 and / or an elastic connector 60 between two adjacent battery cells 23 can pass through the notches 233 and connect to the housings 231 of the two battery cells 23. In this way, the first connector 30 and / or the elastic connector 60, through direct bonding with the rigid housing 231, can more effectively transmit and disperse stress, thereby enhancing the connection strength between the battery cells 23 and avoiding the problem of connection loosening or failure due to deformation of the insulating film 232.

[0058] It should be noted that the shape of the notch 233 can be set as needed; for example, the notch 233 can be square, circular, or annular. Specifically, this application does not limit this. Furthermore, the number of notches 233 can be set as needed. For example, one notch 233 can be provided, or multiple notches 233 can be provided. Specifically, this application does not limit this.

[0059] It should be noted that in the embodiments of this application, the expanding foam has high fluidity when uncured. By filling the gaps between two adjacent battery modules 20 or between the first battery module 22 and the side wall of the housing 10 with expanding foam, the gaps between the two adjacent battery modules 20 and between the first battery module 22 and the side wall of the housing 10 can be minimized, thereby increasing the energy density of the battery pack 100. Furthermore, the density of the expanding foam after foaming is approximately 0.3 g / cm³, thus improving the energy density of the battery pack 100. Of course, in other embodiments, the density of the expanding foam after foaming can be selected as needed. This application does not limit this.

[0060] Secondly, the embodiments of this utility model also propose an electrical device, which includes a battery pack 100 as described above. The specific structure of the battery pack 100 is as described in the above embodiments. Since this electrical device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0061] It should be noted that the electrical equipment can be vehicles, energy storage power supplies, consumer electronics, medical equipment, or smart cities, etc. Specifically, this application does not limit this.

[0062] The embodiments of this utility model have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this utility model. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A battery pack, characterized in that, include: Box; Multiple battery modules are spaced apart inside the housing and are all connected to the bottom of the housing. Each battery module has a first end face that faces away from the bottom of the housing. Multiple first connectors are provided, with each first connector sandwiched between two adjacent battery modules. The first connectors are used to fix two adjacent battery modules into one unit. Each first connector has a second end face facing away from the bottom of the housing. The second end face is located between the first end face and the bottom of the housing, and the distance between the second end face and the first end face is L1, where 20mm≤L1≤30mm.

2. The battery pack according to claim 1, characterized in that, The first connector is bonded and fixed to two adjacent battery modules; and / or, The battery pack also includes structural adhesive, and the battery module is bonded and fixed to the bottom of the housing by the structural adhesive.

3. The battery pack according to claim 2, characterized in that, The first connector includes expanding foam.

4. The battery pack according to claim 1, characterized in that, The distance between two adjacent battery modules is L2, where 3mm≤L2≤10mm.

5. The battery pack according to claim 1, characterized in that, The plurality of battery modules include a plurality of first battery modules, and the sidewalls of the plurality of first battery modules are disposed opposite to the sidewalls of the housing; The battery pack also includes a plurality of second connectors, and the first battery module is bonded and fixed to the corresponding side wall of the housing through the second connectors.

6. The battery pack according to claim 5, characterized in that, The second connector includes expanding foam.

7. The battery pack according to claim 5, characterized in that, The first battery module has a third end face that is located away from the bottom of the housing; The second connector has a fourth end face that is disposed away from the bottom of the housing. The fourth end face is located between the third end face and the bottom of the housing. The distance between the fourth end face and the third end face is L3, wherein 20mm≤L3≤30mm.

8. The battery pack according to any one of claims 1 to 7, characterized in that, The battery module includes multiple battery cells arranged at intervals in sequence; The battery pack also includes multiple elastic connectors, with the elastic connectors sandwiched between two adjacent battery cells.

9. The battery pack according to claim 8, characterized in that, The elastic connector is bonded and fixed between the two adjacent battery cells.

10. The battery pack according to claim 8, characterized in that, The elastic connector includes foam.

11. The battery pack according to claim 8, characterized in that, The battery cell includes a housing and an insulating film covering the housing. The insulating film includes a membrane segment disposed corresponding to the side wall of the housing. The membrane segment is provided with a notch. The first connector and / or the elastic connector between two adjacent battery cells are adapted to pass through the notch and connect to the housing of the two battery cells.

12. An electrical appliance, characterized in that, Includes the battery pack as described in any one of claims 1 to 11.

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