Battery module, battery pack, and electric device

Abstract

The application provides a battery module, a battery pack and a power utilization device to improve the technical problem of long production time of the battery pack. The battery module comprises a box body, a battery cell, foamed glue and a busbar. The box body comprises a bottom plate and a side plate arranged around the bottom plate, and the bottom plate and the side plate define a first accommodating cavity. At least one pair of grooves are arranged on the box body and sequentially distributed along a first direction. Each groove is arranged through the side plate. The first direction intersects with the depth direction of the first accommodating cavity. The battery cell is arranged in the first accommodating cavity. Two ends of the battery cell are respectively supported and matched with the pair of grooves. The foamed glue is arranged in the first accommodating cavity and fills the space between the battery cell and the box body. The busbar is arranged outside the first accommodating cavity and connected with the battery cell through the groove. When the battery module is prepared, the busbar can be connected with the battery cell through the groove outside the first accommodating cavity in the process of foaming the foamed glue from the foamed glue raw material. Therefore, the production time of the battery module can be greatly shortened, and the production efficiency can be improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to a battery module, battery pack, and power-consuming device. Background Technology

[0002] In related technologies, the battery cells are typically welded to the aluminum busbars first, then placed into the battery pack housing and filled with expanding foam. The foam then expands. However, this method involves welding the battery cells to the aluminum busbars and expanding the expanding foam in separate steps, resulting in a longer production time for the battery pack. Utility Model Content

[0003] The embodiments of this application provide a battery module, a battery pack, and an electrical device, which can improve the technical problem of long production time for battery packs.

[0004] In a first aspect, embodiments of this application provide a battery module, comprising:

[0005] The box body includes a bottom plate and a side plate surrounding the bottom plate, the bottom plate and the side plate defining a first receiving cavity; the box body has at least one pair of grooves distributed sequentially along a first direction, each groove penetrating the side plate, the first direction intersecting the depth direction of the first receiving cavity;

[0006] A battery cell is disposed within the first receiving cavity, and both ends of the battery cell are respectively supported and engaged with a pair of grooves;

[0007] Expanding foam is disposed within the first receiving cavity and fills the space between the battery cell and the housing; and

[0008] A busbar is located outside the first receiving cavity and connected to the battery cell through the groove.

[0009] Since the foaming adhesive is located inside the first receiving cavity and the busbar is located outside the first receiving cavity, when manufacturing the battery module, the battery cell can be placed inside the first receiving cavity first, and the end of the battery cell can be supported and matched with the groove on the side plate of the box. Then, the foaming adhesive material is added to the first receiving cavity. During the process of foaming the foaming adhesive material to form foaming adhesive, the busbar can be connected to the battery cell through the groove outside the first receiving cavity at the same time. This can greatly shorten the production time of the battery module and improve production efficiency.

[0010] The prepared battery modules can be packed into the battery pack housing to obtain the battery pack. Thanks to the improved production efficiency of the battery modules, the production efficiency of the battery pack is also improved.

[0011] In one embodiment, the battery cell includes a battery cell body and terminals. The battery cell body has two opposite ends, and the ends of the battery cell body abut against the side plate. The terminals protrude from the two ends of the battery cell body, extend into the groove, and are limited and engaged with the groove. The busbar is connected to the terminals.

[0012] When the battery cell is installed on the housing, the battery cell body is completely located within the first receiving cavity, and the end of the battery cell body abuts against the side plate, i.e., the inner surface of the first receiving cavity. The terminals protruding from the two ends of the battery cell body extend into the grooves. In this way, the battery cell body can be used to seal the grooves on the side plate. When the foaming material is added to the first receiving cavity, it can prevent the foaming material from flowing out of the first receiving cavity through the grooves. With the terminals and grooves providing limiting cooperation, the battery cell can be positioned, reducing the risk of battery cell shaking, and thus facilitating the connection of the busbar to the terminals from the outside of the housing.

[0013] In one embodiment, the battery cell body includes a housing and an electrode assembly disposed within the housing, wherein the electrode post passes through the housing and is electrically connected to the electrode assembly.

[0014] The battery cell body includes a housing and an electrode assembly. The electrode assembly is located inside the housing and is protected by the housing. The electrode post passes through the housing and assists the electrode assembly in making electrical connections with the structure outside the housing.

[0015] In one embodiment, the battery module further includes a battery management system module and a first fixing frame, one end of the first fixing frame being inserted and fixed to the foam; the other end of the first fixing frame is exposed outside the foam and supports the battery management system module, and the busbar includes a first busbar, which connects the terminal post and the battery management system module.

[0016] In the battery module, the battery cell is electrically connected to the battery management system module through the first busbar. The battery management system module can manage and control the operation of the battery cell. At the same time, the battery management system module is supported by a first fixing frame, and the first fixing frame is fixed with foam adhesive, so that the battery module has a simple and reliable structure.

[0017] In one embodiment, the battery module further includes a second fixing frame, one end of which is inserted and fixed to the expanding foam; the other end of the second fixing frame is exposed outside the expanding foam and supports the first busbar.

[0018] In the battery module, a second fixing frame can be set to support the first busbar, and foam adhesive can be used to fix the second fixing frame, thus making the battery module structure simple and reliable.

[0019] In one embodiment, the number of battery cells is multiple, and the busbar further includes a second busbar that connects to the terminals of different battery cells.

[0020] The busbar includes a first busbar and a second busbar. The first busbar is used to connect the battery cell and the battery management system module to realize the electrical connection between the battery cell and the battery management system module, while the second busbar is used to connect different battery cells to realize the electrical connection between the battery cells.

[0021] In one embodiment, the battery cell further includes an explosion-proof valve disposed on at least one end of the battery cell body and corresponding to the groove position.

[0022] The explosion-proof valve is used to discharge the high-temperature fluid inside the battery cell body in the event of thermal runaway. The explosion-proof valve is positioned in the groove, which helps the battery cell body discharge the high-temperature fluid to the outside of the casing, reducing the risk of thermal runaway spreading.

[0023] In one embodiment, the housing is an insulating component.

[0024] The casing is an insulating component, which can reduce the risk of short circuit between the battery cell and the casing.

[0025] In one embodiment, the wall thickness of the box body is 0.1 mm to 0.5 mm.

[0026] If the box wall thickness is too small, the box strength will be reduced, making it unable to properly accommodate and support the battery cells and foam. However, if the box is too thick, the energy density of the battery module will decrease.

[0027] In one embodiment, the battery cell is a cylindrical battery cell.

[0028] Cylindrical cells have a lower volume expansion rate in the later stages of cycling, which makes it less likely for the foam to be squeezed and cause deformation of the battery module.

[0029] Secondly, embodiments of this application provide a battery pack, comprising:

[0030] The housing has a second receiving cavity; and

[0031] The battery module as described above is disposed within the second receiving cavity.

[0032] Thirdly, embodiments of this application provide an electrical device including the battery pack described above. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 This is a three-dimensional structural diagram of the battery module provided in an embodiment of this application;

[0035] Figure 2 This is a perspective view of the housing in the battery module provided in an embodiment of this application;

[0036] Figure 3 This is a top view of the battery module provided in an embodiment of this application;

[0037] Figure 4 yes Figure 3 Sectional view along line AA;

[0038] Figure 5 yes Figure 3 Enlarged view of section B;

[0039] Figure 6 This is a cross-sectional structural diagram of the battery pack provided in an embodiment of this application.

[0040] Explanation of reference numerals in the attached figures:

[0041] 10. Battery module; 1. Box body; 11. Base plate; 12. Side plate; 13. First receiving cavity; 14. Groove; 2. Battery cell; 21. Battery cell body; 22. Terminal post; 23. Explosion-proof valve; 3. Foam; 4. Busbar; 41. First busbar; 42. Second busbar; 5. Battery management system module; 6. First fixing frame; 7. Second fixing frame; 20. Battery pack; 201. Box body; 202. Second receiving cavity. Detailed Implementation

[0042] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0043] Furthermore, it should be understood that the specific embodiments described herein are for illustrative and explanatory purposes only and are not intended to limit the scope of this application. In this application, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in its actual use or operation, specifically the directions shown in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0044] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0045] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0046] The terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0047] In the description of the embodiments of this application, the words "example" or "for example" are used to indicate exemplification, illustration, or description. Any embodiment or design described as "example" or "for example" in the embodiments of this application is not to be construed as being more preferred or having more advantages than another embodiment or design. The use of the words "example" or "for example" is intended to present relative concepts in a clear manner.

[0048] To facilitate understanding of the present application, the spline curves and arrows used in the reference numerals in the accompanying drawings are explained below: spline curves without arrows indicate solid parts, that is, parts with solid structures; spline curves with arrows indicate virtual parts, that is, parts without solid structures.

[0049] Firstly, please see Figures 1 to 6 This application provides a battery module 10. The battery module 10 includes a housing 1, a battery cell 2, a foam 3, and a busbar 4. The housing 1 includes a bottom plate 11 and a side plate 12 surrounding the bottom plate 11, which defines a first receiving cavity 13. At least one pair of grooves 14 are provided on the housing 1, which are arranged sequentially along a first direction. Each groove 14 passes through the side plate 12, and the first direction intersects the depth direction of the first receiving cavity 13. The battery cell 2 is disposed in the first receiving cavity 13, and its two ends are respectively supported and engaged with a pair of grooves 14. The foam 3 is disposed in the first receiving cavity 13 and fills the space between the battery cell 2 and the housing 1. The busbar 4 is located outside the first receiving cavity 13 and is connected to the battery cell 2 through the grooves 14.

[0050] The box 1 can be understood as a container used to house the battery cell 2 and the expanding foam 3. Specifically, the box 1 includes a base plate 11 and side plates 12. The side plates 12 are arranged around the base plate 11 and together with the base plate 11 define a first receiving cavity 13, within which the battery cell 2 and the expanding foam 3 are disposed. As an example, the side plates 12 include four sub-side plates connected end to end, which stand upright on one side surface of the base plate 11, forming a square box 1. The material of the box 1 includes, but is not limited to, at least one of metal and plastic. Optionally, the material of the box 1 is plastic, which is not only lightweight but also has poor conductivity, thus reducing the risk of short circuits other than those caused by the battery cell 2.

[0051] The box body 1 has at least one pair of grooves 14. Optionally, the box body 1 may have one pair, two pairs, three pairs, four pairs, or five pairs of grooves 14, or even more. Each pair of grooves 14 includes two grooves 14, which are designated as the first groove and the second groove for easy distinction. The two grooves 14 in each pair, namely the first groove and the second groove, are sequentially distributed on the box body 1 along a first direction. This first direction intersects the depth direction of the first receiving cavity 13. Optionally, the first direction is perpendicular to the depth direction of the first receiving cavity 13. Each groove 14 is provided through the side plate 12; that is, both the first groove and the second groove are formed on the side plate 12. As an example, the box body 1 is square, and the side panel 12 includes a first sub-side panel, a second sub-side panel, a third sub-side panel, and a fourth sub-side panel connected end to end. The first, second, third, and fourth sub-side panels are all vertically arranged on one side of the base plate 11, wherein the first and third sub-side panels are parallel and spaced apart and opposite to each other, and the second and fourth sub-side panels are parallel and spaced apart and opposite to each other. The box body 1 is provided with four pairs of grooves 14, each pair of grooves 14 corresponding to the first and third sub-side panels respectively. Of course, in other examples, the box body 1 can also be circular.

[0052] The battery cell 2, also known as a battery unit, has two opposing ends, namely the first end and the second end. The battery module 10 contains at least one battery cell 2. Optionally, there may be multiple battery cells 2, all of which are disposed within the first receiving cavity 13. When the battery cell 2 is disposed within the first receiving cavity 13, both ends of the battery cell 2 are supported and engaged with a pair of grooves 14, i.e., the first end is supported and engaged with one of the pair of grooves 14, and the second end with the other. Since the pair of grooves 14 are sequentially distributed along a first direction, when the battery cell 2 is correctly placed within the first receiving cavity 13, the battery cell 2 should extend along the first direction. When both ends of the battery cell 2 are supported and engaged with the pair of grooves 14, the battery cell 2 can be positioned on the side plate 12 of the housing 1. Optionally, the two ends of the battery cell 2 are supported and engaged with the pair of grooves 14, and the battery cell 2 is spaced apart from the bottom plate 11 of the housing 1.

[0053] Foam 3 is a solid, obtained by foaming and curing a foaming raw material. As an example, foam 3 is a polyurethane foam. The foaming raw material of polyurethane foam includes a polyurethane prepolymer, a foaming agent, and a catalyst. The foaming raw material can react with moisture in the air or moisture in the matrix to produce gases (such as carbon dioxide, nitrogen, etc.). These gases expand rapidly in the colloid, forming a large number of tiny bubbles. As the number and expansion of the bubbles increase, the colloid gradually becomes fluffy and soft, eventually forming a foamed material, i.e., foam. In other examples, foam 3 can also be selected from at least one of acrylic foam, polyester foam, silicone foam, and amino silicone foam. When the type of foam 3 changes, the composition of the foaming raw material will also change accordingly.

[0054] In preparing the expanding foam 3, the expanding foam raw material is added to the first receiving cavity 13. At this time, the first receiving cavity 13 also contains a battery cell 2. Both ends of the battery cell 2 are supported and engaged with a pair of grooves 14. The expanding foam raw material foams within the first receiving cavity 13, and the foam formed fills the gap between the battery cell 2 and the housing 1. When there are multiple battery cells 2, the foam also fills the gaps between the battery cells 2. After the foam solidifies, the expanding foam 3 is obtained. The battery cell 2 is partially or completely encased in the expanding foam 3, which supports and fixes the battery cell 2.

[0055] Busbar 4 is a conductive component and is connected to battery cell 2. Busbar 4 is located outside the first receiving cavity 13, specifically on the outer side of the housing 1. Since both ends of battery cell 2 are supported and engaged with a pair of grooves 14, busbar 4 can be connected to battery cell 2 through the grooves 14. Optionally, busbar 4 is a metal component and is welded to battery cell 2. As an example, busbar 4 is an aluminum busbar.

[0056] In summary, since the expanding foam 3 is located inside the first receiving cavity 13 and the busbar 4 is located outside the first receiving cavity 13, when manufacturing the battery module 10, the battery cell 2 can be placed inside the first receiving cavity 13 first, and the end of the battery cell 2 can be supported and engaged with the groove 14 on the side plate 12 of the box body 1. Then, the expanding foam material is added to the first receiving cavity 13. During the process of the expanding foam material foaming to form the expanding foam 3 inside the first receiving cavity 13, the busbar 4 can be connected to the battery cell 2 simultaneously outside the first receiving cavity 13 through the groove 14. This can greatly shorten the production time of the battery module 10 and improve production efficiency.

[0057] The battery module 10 obtained can be installed into the housing 201 of the battery pack 20 to obtain the battery pack 20. Thanks to the improved production efficiency of the battery module 10, the production efficiency of the battery pack 20 is also improved.

[0058] As an example, in related technologies, during the normal production process of a battery pack, the process of foaming the foaming material to form foam takes 10 minutes, and the process of welding the battery cell to the busbar takes 15 minutes. However, in the embodiment of this application, since the formation process of the foaming material 3 and the connection process of the battery cell 2 to the busbar 4 can be carried out simultaneously, at least 10 minutes can be saved, thereby improving the production efficiency of the battery pack 20.

[0059] For some embodiments of this application, please refer to Figure 1 and Figure 5 The battery cell 2 includes a battery cell body 21 and a terminal post 22. The battery cell body 21 has two opposite ends. The end of the battery cell body 21 abuts against the side plate 12. The terminal post 22 protrudes from the two ends of the battery cell body 21. The terminal post 22 extends into the groove 14 and is limited and matched with the groove 14. The busbar 4 is connected to the terminal post 22.

[0060] The battery cell body 21 has two protruding terminals 22 at opposite ends. The terminal 22 at one end of the battery cell body 21 is the positive terminal, and the terminal 22 at the other end of the battery cell body 21 is the negative terminal. The battery cell 2 is connected to the busbar 4 specifically by connecting the terminal 22 to the busbar 4.

[0061] When the battery cell 2 is installed on the housing 1, the battery cell body 21 is completely located inside the first receiving cavity 13, and the end of the battery cell body 21 abuts against the side plate 12, that is, the inner surface of the first receiving cavity 13. The pole posts 22 protruding from the two ends of the battery cell body 21 extend into a pair of grooves 14 respectively. In this way, the battery cell body 21 can be used to block the grooves 14 on the side plate 12. When the foaming material is added into the first receiving cavity 13, it can prevent the foaming material from flowing out of the first receiving cavity 13 through the grooves 14. With the pole posts 22 and the grooves 14 limiting the fit, the battery cell 2 can be positioned, reducing the risk of the battery cell 2 shaking, and thus facilitating the connection of the bus 4 to the pole posts 22 from the outside of the housing 1.

[0062] In some embodiments of this application, the battery cell body 21 includes a housing and an electrode assembly disposed within the housing, with the electrode post 22 passing through the housing and electrically connected to the electrode assembly.

[0063] Electrode assemblies typically include a positive electrode and a negative electrode disposed opposite each other. Optionally, the electrode assembly also includes a separator disposed between the positive and negative electrodes to prevent short circuits caused by contact between the positive and negative electrodes. Of course, in some embodiments, the electrode assembly includes a solid electrolyte membrane disposed between the positive and negative electrodes to facilitate ion conduction. Here, the electrode assembly can be a wound structure or a stacked structure.

[0064] The electrode assembly is housed within the housing, which protects the electrode assembly. The housing can be either rigid or flexible.

[0065] The electrode post 22 is a structure that connects the auxiliary electrode assembly to the circuit outside the housing. The electrode post 22 is installed on the housing, with one end inside the housing and electrically connected to the electrode assembly, and the other end exposed outside the housing.

[0066] In detail, the terminal 22 includes a positive terminal and a negative terminal, wherein the positive terminal is electrically connected to the positive electrode plate and the negative terminal is electrically connected to the negative electrode plate.

[0067] The battery cell body 21 includes a housing and an electrode assembly. The electrode assembly is located inside the housing and is protected by the housing. The electrode post 22 passes through the housing and assists the electrode assembly in making electrical connections with the structure outside the housing.

[0068] For some embodiments of this application, please refer to Figure 1 and Figure 4The battery module 10 also includes a battery management system module 5 and a first fixing frame 6. One end of the first fixing frame 6 is inserted and fixed to the foam 3; the other end of the first fixing frame 6 is exposed outside the foam 3 and supports the battery management system module 5. The busbar 4 includes a first busbar 41, which connects the terminal post 22 to the battery management system module 5.

[0069] Battery cell 2 is electrically connected to battery management system module 5 via first bus 41. Battery management system module 5 can manage and control the operation of battery cell 2. As an example, battery management system module 5 includes a BMS board.

[0070] In the battery module 10, the battery management system module 5 is supported by a first fixing frame 6, and the first fixing frame 6 is fixed by foam adhesive 3, so that the structure of the battery module 10 is simple and reliable.

[0071] As an example, the first fixing frame 6 is an L-shaped or T-shaped support piece. When preparing the expanding foam 3, one end of the first fixing frame 6 is inserted into the first receiving cavity 13, and the depth of the first fixing frame 6 inserted into the first receiving cavity 13 is controlled. Expanding foam material is added into the first receiving cavity 13, so that the foam formed by the expanding foam material wraps around one end of the first fixing frame 6. After the foam solidifies, solid expanding foam 3 is obtained, and one end of the first fixing frame 6 is fixed by the expanding foam 3.

[0072] For some embodiments of this application, please refer to Figure 1 and Figure 4 The battery module 10 also includes a second fixing frame 7, one end of which is inserted and fixed to the foam 3; the other end of the second fixing frame 7 is exposed outside the foam 3 and supports the first busbar 41.

[0073] In the battery module 10, the first busbar 41 can also be supported by a second fixing frame 7, and the second fixing frame 7 can be fixed by foam 3, so that the structure of the battery module 10 is simple and reliable.

[0074] As an example, the second fixing frame 7 is an L-shaped or T-shaped support piece. When preparing the expanding foam 3, one end of the second fixing frame 7 is inserted into the first receiving cavity 13, and the depth of the second fixing frame 7 inserted into the first receiving cavity 13 is controlled. Expanding foam material is added into the first receiving cavity 13, so that the foam of the expanding foam material wraps around one end of the second fixing frame 7. After the foam solidifies, solid expanding foam 3 is obtained, and one end of the second fixing frame 7 is fixed by the expanding foam 3.

[0075] During the process of fixing the first fixing frame 6 and the second fixing frame 7 together with the expanding foam 3, the depth to which one end of the first fixing frame 6 and one end of the second fixing frame 7 extend into the first receiving cavity 13 can be controlled by the first tooling. As an example, the first tooling is a plate mounted above the box body 1, and the plate is provided with multiple hooks extending toward the first receiving cavity 13. The first fixing frame 6 and the second fixing frame 7 are respectively hung on different hooks, so that the first fixing frame 6 and the second fixing frame 7 are suspended above the bottom plate 11 of the box body 1.

[0076] For some embodiments of this application, please refer to Figure 1 There are multiple battery cells 2. The busbar 4 also includes a second busbar 42, which connects to the terminals 22 of different battery cells 2.

[0077] As can be seen, the busbar 4 includes a first busbar 41 and a second busbar 42. The first busbar 41 is used to connect the battery cell 2 and the battery management system module 5 to realize the electrical connection between the battery cell 2 and the battery management system module 5, while the second busbar 42 is used to connect different battery cells 2 to realize the electrical connection between the battery cells 2.

[0078] It should be noted that when there is only one cell 2, the cell 2 is electrically connected to the battery management system module 5 through the first bus 41; when there are multiple cells 2, it is not necessary to connect all cells 2 to the battery management system module 5, but only a portion, such as one cell 2, can be connected to the battery management system module 5.

[0079] Different battery cells 2 are electrically connected through a second busbar 42. Different battery cells 2 can be connected in series or in parallel, which is not limited here.

[0080] For some embodiments of this application, please refer to Figure 1 The battery cell 2 also includes an explosion-proof valve 23, which is disposed on at least one end of the battery cell body 21 and corresponds to the position of the groove 14.

[0081] An explosion-proof valve 23 may be provided on one end of the battery cell body 21, or an explosion-proof valve 23 may be provided on both ends of the battery cell body 21.

[0082] The explosion-proof valve 23 is used to discharge the high-temperature fluid inside the cell body 21 when the cell 2 experiences thermal runaway. The explosion-proof valve 23 corresponds to the groove 14, which facilitates the discharge of the high-temperature fluid from the cell body 21 to the outside of the housing 1, reducing the risk of thermal runaway propagation.

[0083] In some embodiments of this application, the housing 1 is an insulating component.

[0084] Optionally, the material of the box body 1 is an organic polymer, including but not limited to at least one of polyethylene, polyvinyl chloride, polytetrafluoroethylene and polyethylene terephthalate (PET).

[0085] The housing 1 is an insulating component, which can reduce the risk of short circuit between the battery cell 2 and the housing 1.

[0086] In some embodiments of this application, the wall thickness of the box 1 is 0.1 mm to 0.5 mm.

[0087] If the wall thickness of the box 1 is too small, it will reduce the strength of the box 1, making it unable to properly accommodate and support the battery cell 2 and the foam 3. However, if the box 1 is too thick, it will cause the energy density of the battery module 10 to decrease.

[0088] As an example, the wall thickness of box 1 is any one of 0.1mm, 0.2mm, 0.3mm, 0.4mm and 0.5mm or a range between any two.

[0089] In some embodiments of this application, cell 2 is a cylindrical cell.

[0090] Cylindrical cells have a lower volume expansion rate in the later stages of cycling, which makes it less likely for the foam 3 to be squeezed, thus preventing deformation of the battery module 10.

[0091] Secondly, please see Figure 6 This application provides a battery pack 20, comprising:

[0092] The housing 201 has a second receiving cavity 202; and

[0093] The battery module 10 is disposed within the second receiving cavity 202.

[0094] The battery pack 20 includes the battery module 10 described above, and therefore the battery pack 20 has all the beneficial effects of the battery module 10 described above, which will not be elaborated here.

[0095] In some embodiments of this application, the battery pack 20 is a low-voltage battery pack, and the output voltage of the low-voltage battery pack is less than or equal to 48V. As an example, the battery pack 20 can be a 12V low-voltage battery pack, a 24V low-voltage battery pack, or a 48V low-voltage battery pack.

[0096] In some embodiments of this application, the low-voltage battery pack is a starter battery pack. A starter battery pack, also known as a starting power supply, is a power device used to provide initial power to a device or system to start its operation. As an example, a starter battery pack includes an automotive starter power supply.

[0097] Thirdly, embodiments of this application provide an electrical device including the aforementioned battery pack 20.

[0098] The power supply device includes the aforementioned battery pack 20, and the power supply device has all the beneficial effects of the aforementioned battery pack 20, which will not be repeated here.

[0099] It should be noted that the electrical device includes, but is not limited to, at least one of vehicles and processing tools. For example, vehicles include cars, aircraft, etc.; processing tools include electric drills, electric screwdrivers, etc.

[0100] The embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. 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 application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A battery module (10), characterized in that, include: The box body (1) includes a bottom plate (11) and a side plate (12) surrounding the bottom plate (11). The bottom plate (11) and the side plate (12) define a first receiving cavity (13). The box body (1) has at least one pair of grooves (14) arranged sequentially along a first direction. Each groove (14) is disposed through the side plate (12). The first direction intersects the depth direction of the first receiving cavity (13). The battery cell (2) is disposed in the first receiving cavity (13), and the two ends of the battery cell (2) are respectively supported and engaged with a pair of grooves (14); Expanding foam (3) is disposed within the first receiving cavity (13) and fills the space between the battery cell (2) and the housing (1); and The busbar (4) is located outside the first receiving cavity (13) and connected to the battery cell (2) through the groove (14).

2. The battery module (10) according to claim 1, characterized in that, The battery cell (2) includes a battery cell body (21) and a terminal post (22). The battery cell body (21) has two opposite ends. The ends of the battery cell body (21) abut against the side plate (12). The terminal post (22) protrudes from the two ends of the battery cell body (21). The terminal post (22) extends into the groove (14) and is limited and matched with the groove (14). The busbar (4) is connected to the terminal post (22).

3. The battery module (10) according to claim 2, characterized in that, The battery cell body (21) includes a housing and an electrode assembly disposed within the housing, and the electrode post (22) passes through the housing and is electrically connected to the electrode assembly.

4. The battery module (10) according to claim 2, characterized in that, The battery module (10) further includes a battery management system module (5) and a first fixing frame (6). One end of the first fixing frame (6) is inserted and fixed to the foam (3). The other end of the first fixing frame (6) is exposed outside the foam (3) and supports the battery management system module (5). The busbar (4) includes a first busbar (41), which connects the terminal post (22) to the battery management system module (5).

5. The battery module (10) according to claim 4, characterized in that, The battery module (10) also includes a second fixing frame (7), one end of which is inserted and fixed to the foam (3); the other end of the second fixing frame (7) is exposed outside the foam (3) and supports the first busbar (41).

6. The battery module (10) according to claim 4, characterized in that, The number of the battery cells (2) is multiple, and the busbar (4) further includes a second busbar (42), which connects the terminals (22) of different battery cells (2).

7. The battery module (10) according to claim 2, characterized in that, The battery cell (2) also includes an explosion-proof valve (23), which is disposed on at least one end of the battery cell body (21) and corresponds to the position of the groove (14).

8. The battery module (10) according to any one of claims 1 to 7, characterized in that, The box body (1) is an insulating component; and / or, The wall thickness of the box body (1) is 0.1 mm to 0.5 mm; and / or, The battery cell (2) is a cylindrical battery cell.

9. A battery pack (20), characterized in that, include: The housing (201) has a second receiving cavity (202); as well as The battery module (10) as described in any one of claims 1 to 8 is disposed within the second receiving cavity (202).

10. An electrical device, characterized in that, Includes the battery pack (20) as described in claim 9.

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