A battery module, a battery pack and an electric device

Abstract

The application provides a battery module, a battery pack and a power utilization device. The battery module comprises a battery cell assembly and a first circuit board. A plurality of battery cells in the battery cell assembly are arranged along a first direction. The first circuit board is arranged along the first direction with the battery cell assembly. A first conductive part of the first circuit board is arranged on a path of a main circuit of the battery module. The first conductive part is configured to be disconnected in response to extrusion of the battery cell assembly. When overcharging or other abnormalities of the battery module cause excessive expansion of the battery cells, the expansion of the battery cell assembly along the first direction extrudes the first conductive part, disconnects the first conductive part, cuts off the main circuit, and realizes overcharging protection of the battery module, which is beneficial to improve the safety of the module.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery module, battery pack and electrical equipment. Background Technology

[0002] Rechargeable batteries are batteries that can be reused after being discharged by recharging to reactivate the active materials. They are widely used in electronic devices such as mobile phones, laptops, power tools, and two-wheeled vehicles.

[0003] In the development of battery technology, battery pack safety has always been a major concern. Overcharging is one of the main causes of battery thermal runaway, and preventing overcharging has become an important research direction in the industry. Summary of the Invention

[0004] In view of the above problems, this application provides a battery pack that is beneficial to improving the safety of the battery pack.

[0005] To achieve the above objectives, this application adopts the following technical solution:

[0006] In a first aspect, this application provides a battery module including a cell assembly and a first circuit board. The cell assembly includes a plurality of cells arranged along a first direction. Along the first direction, the cell assembly and the first circuit board are arranged. The first circuit board includes a first conductive element disposed on the path of the main circuit of the battery module. The first conductive element is configured to disconnect in response to compression of the cell assembly to shut off the main circuit.

[0007] According to some embodiments of the present application, the battery module provided includes a first circuit board, and the first conductive element is printed on the substrate.

[0008] According to some embodiments of this application, the battery module includes a substrate comprising a first component, a second component, and a third component, wherein the first component is connected to the second component via the third component; a first conductive element covers at least a portion of the third component, and the third component is configured to disconnect in response to compression of the battery cell assembly.

[0009] According to some embodiments of the present application, the third component includes a first recess, which faces the cell assembly along the first direction; wherein, along the first direction, the thickness of the first recess is less than the thickness of the first component, and the thickness of the first recess is less than the thickness of the second component.

[0010] According to some embodiments of the present application, the battery module has at least one first hole, which penetrates the third component along the first direction.

[0011] According to some embodiments of this application, the battery module further includes a fourth component located between the cell assembly and the first conductive element; wherein the fourth component is configured to disconnect the first conductive element when squeezed by the cell assembly.

[0012] According to some embodiments of the present application, the fourth component includes a main body and a protrusion; along the first direction, the protrusion protrudes from the main body and extends toward the first conductive element; wherein, along the first direction, the projection of the protrusion overlaps with the projection of the first conductive element.

[0013] According to some embodiments of the present application, the battery module provided has a first conductive element that can cover the entire surface of the substrate, which is beneficial to further increase the current carrying capacity of the first conductive element.

[0014] According to some embodiments of the present application, the battery module includes a first conductive element comprising a copper foil printed on a substrate, wherein the substrate and the copper foil are connected by a bonding agent such as epoxy resin.

[0015] According to some embodiments of the battery module provided in this application, the first conductive element can be formed by soldering connecting wires and conductive sheets on a printed circuit board. The first conductive element has good current carrying capacity, which is beneficial to improving the safety of the battery module. For example, the conductive sheet can be a copper busbar.

[0016] According to some embodiments of the present application, the battery module can be made of a material with lower strength in a portion of the first conductive element, so that the portion of the first conductive element will break when it is squeezed.

[0017] Secondly, this application also provides a battery pack, which includes the battery module provided by any of the above-mentioned technical solutions, and the battery pack further includes a housing, wherein at least a portion of the battery module is located within the housing.

[0018] According to some embodiments of this application, the battery pack in which the first circuit board is fixed to the housing.

[0019] According to some embodiments of this application, the battery pack further includes a connector configured to connect to an electrical device; the first conductive element includes a first portion, a second portion, and a third portion, the first portion and the second portion being connected through the third portion, the first portion being connected between the connector and the third portion, the second portion being connected between the third portions of the cell assembly, and the third portion being configured to disconnect when squeezed by the cell assembly.

[0020] According to some embodiments of this application, the battery pack further includes a first electrical connector, the first electrical connector including a first segment and a second segment that are separated from each other, the first segment connecting the cell assembly and the second part, and the second segment connecting the connector and the first part.

[0021] According to some embodiments of the present application, the battery pack further includes a second circuit board and an insulating support, the second circuit board and the insulating support being disposed within the housing; along the first direction, the second circuit board and the connector are disposed on the side of the insulating support away from the cell assembly, and the first circuit board is disposed on the side of the insulating support close to the cell assembly.

[0022] According to some embodiments of the present application, the battery pack provided has an opening in the insulating bracket, and the second segment passes through the opening and connects to the connector.

[0023] According to some embodiments of the present application, the second circuit board is electrically connected to multiple cells in the cell assembly, and a battery management system (BMS) component can be installed on it. The BMS component includes multiple electronic components, which can realize functions such as data acquisition, control, protection, communication, power calculation, signal transmission, and power transmission of the cells in the cell assembly 1. It can intelligently manage and maintain multiple cells, which is beneficial to improving the performance and service life of the battery pack.

[0024] According to some embodiments of the present application, a battery pack includes a first circuit board located between an insulating support and a cell assembly. The battery pack includes fasteners that securely connect the insulating support, the first circuit board, and the housing, further restricting the movement of the first circuit board as the cell assembly expands. In a third aspect, the present application also provides an electrical device comprising a load and a battery pack provided by any of the above-described technical solutions; the battery pack supplies power to the load.

[0025] The technical solutions provided by the embodiments of this disclosure have at least the following beneficial effects:

[0026] This application provides a battery module including a cell assembly and a first circuit board. Multiple cells in the cell assembly are arranged along a first direction. The first circuit board and the cell assembly are also arranged along the first direction. A first conductive element on the first circuit board is disposed on the path of the main circuit of the battery module. The first conductive element is configured to disconnect in response to compression by the cell assembly. With this structure, when the battery module experiences overcharging or other abnormalities causing excessive cell expansion, the expansion of the cell assembly along the first direction will compress the first conductive element, causing it to disconnect and cutting off the main circuit. This achieves overcharge protection for the battery module and improves the module's safety.

[0027] This application also provides a battery pack in which the battery module is disposed within a housing. Since the battery pack includes the housing and the battery module provided by the above-described technical solution, the battery pack has overcharge protection function and has good safety.

[0028] This application also provides an electrical device that has a high level of safety because it includes the battery pack provided by the above-described technical solution.

[0029] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0030] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0031] Figure 1 This is a schematic diagram of the structure of a battery module provided in some embodiments of this application;

[0032] Figure 2 This is a schematic diagram of the structure of a first circuit board provided in some embodiments of this application;

[0033] Figure 3 This is a schematic diagram of the structure of a first circuit board provided in some embodiments of this application;

[0034] Figure 4 This is a schematic diagram of another structure of the first circuit board provided in some embodiments of this application;

[0035] Figure 5 This is a schematic diagram of a portion of the internal structure of a battery pack provided in some embodiments of this application;

[0036] Figure 6 yes Figure 5 Enlarged view of point A in the middle;

[0037] Figure 7 A perspective view of a first circuit board provided in some embodiments of this application;

[0038] Figure 8 A schematic diagram from one perspective of a first circuit board provided in other embodiments of this application;

[0039] Figure 9 This is a partial structural schematic diagram of a battery pack provided in some embodiments of this application;

[0040] Figure 10 This is a schematic diagram showing the disassembled structure of a battery module provided in some embodiments of this application.

[0041] 1. Battery cell assembly; 11. Battery cell; 2. First circuit board; 21. First conductive element; 210. Conductive sheet; 211. First part; 212. Second part; 213. Third part; 22. Substrate; 221. First component; 222. Second component; 223. Third component; 2231. First recess; 2232. First hole; 3. Fourth component; 31. Main body; 32. Protrusion; 4. Housing; 5. Connector; 51. Connecting terminal; 52. Base; 61. First segment; 62. Second segment; 621. First connecting segment; 622. Second connecting segment; 7. Second electrical connector; 8. Second circuit board; 9. Insulating bracket; 91. Opening; 100. Conductive element; 101. Fastener. Detailed Implementation

[0042] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0043] It should be noted that, unless otherwise stated, the technical or scientific terms used in the embodiments of this application should have the ordinary meaning understood by those skilled in the art to which the embodiments of this application pertain.

[0044] Furthermore, technical terms such as "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. In the description of the embodiments of this application, "a plurality of" means two or more, unless otherwise explicitly defined.

[0045] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0046] In the description of the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0047] Currently, judging from market trends, battery applications are becoming increasingly widespread. Batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also extensively in electric vehicles such as electric bicycles and motorcycles, as well as power tools, communication equipment, and many other fields. With the continuous expansion of battery applications, market demand is also constantly increasing.

[0048] The technical solution of a battery module, battery pack, and electrical equipment provided in this application will be further described below through specific embodiments.

[0049] like Figure 1 As shown, some embodiments of this application provide a battery module, which includes a cell assembly 1 and a first circuit board 2. The cell assembly 1 includes a plurality of cells 11 arranged along a first direction. The cell assembly 1 and the first circuit board 2 are arranged along the first direction. The first circuit board 2 includes a first conductive element 21, which is disposed on the path of the main circuit of the battery module. The first conductive element 21 is configured to disconnect in response to the compression of the cell assembly 1, so as to shut off the main circuit and cut off the power input or output in the battery module.

[0050] In the first direction, when the cell assembly 1 expands, it squeezes the first conductive element 21. The expansion of multiple cells 11 arranged along the first direction will accumulate in the first direction. The cell assembly 1 will generate expansion displacement in the first direction. The first conductive element 21 will be squeezed and disconnected, thus shutting off the main circuit.

[0051] The battery cell assembly 1 includes a plurality of battery cells 11. Each battery cell 11 includes a battery cell housing, electrode terminals disposed in the battery cell housing, and an electrode assembly disposed within the battery cell housing. The electrode terminals are connected to the electrode assembly and extend from the battery cell housing. In some embodiments, the electrode assembly includes a positive electrode plate, a negative electrode plate, and a separator film located between the positive and negative electrode plates. The battery cells 11 include, but are not limited to, lithium-ion battery cells 11, sodium-ion battery cells 11, etc. The battery cells 11 mainly rely on the movement of metal ions such as lithium ions and sodium ions between the positive and negative electrode plates to operate.

[0052] In some embodiments, cell 11 includes pouch cell.

[0053] In some embodiments, cell 11 includes a prismatic cell.

[0054] In some embodiments, the cell housing includes an aluminum-plastic film.

[0055] In some embodiments, the multiple battery cells 11 can be connected in series, parallel, or in a mixed manner. A mixed connection means that the multiple battery cells 11 are connected in both series and parallel. The multiple battery cells 11 can be directly connected in series, parallel, or in a mixed manner, and then arranged along a first direction to directly form a battery cell assembly 1. Alternatively, the multiple battery cells 11 can be electrically connected and arranged along the first direction to form modules, and then the multiple modules can be connected in series, parallel, or in a mixed manner to form a whole to form a battery cell assembly 1.

[0056] In some embodiments, the main circuit may be a power circuit or a driving circuit, and the main circuit of the battery module includes a charging circuit and / or a discharging circuit. Optionally, the charging port and the discharging port of the battery module are different ports, in which case the path of the charging circuit of the battery module is different from the path of the discharging circuit of the battery module. Optionally, the charging port and the discharging port of the battery module are the same port, in which case the path of the charging circuit of the battery module is the same path.

[0057] The first conductive element 21 is configured to break when squeezed by the battery cell assembly 1. This can mean that a portion of the first conductive element 21 has a weak structure, so that when the first conductive element 21 is squeezed by the battery cell assembly 1, the weak structure breaks, causing the first conductive element 21 to break into at least two parts.

[0058] In some embodiments, a portion of the first conductive element 21 can be machined by cutting, drilling, or other mechanical processes to give that portion a weaker structural strength, so that the first conductive element 21 will break when it is compressed. Alternatively, a portion of the first conductive element 21 can be made of a material with lower strength to give that portion a weaker structural strength, so that the first conductive element 21 will break when it is compressed.

[0059] In some embodiments, such as Figure 2 As shown, the first circuit board 2 includes a substrate 22, and a first conductive element 21 is printed on the substrate 22. For example, the substrate 22 may include one of a phenolic paper laminate, an epoxy paper laminate, a polyester glass mat laminate, or an epoxy glass cloth laminate.

[0060] The substrate 22 can be an insulating device for supporting the first conductive element 21. The first conductive element 21 is printed on the substrate 22, so that the first circuit board 2 composed of the first conductive element 21 and the substrate 22 has good integrity. In other embodiments, the first conductive element 21 can also be connected to the substrate 22 by means of welding, bolts or other connecting parts.

[0061] For example, the first circuit board 2 may be a printed circuit board, the substrate 22 has good insulation properties, and the first conductive element 21 may be a connecting wire on the printed circuit board.

[0062] In some embodiments, the first conductive element 21 is printed on the surface of the substrate 22, and the first conductive element 21 and the substrate 22 are arranged in a row.

[0063] In some embodiments, a portion of the first conductive element 21 is printed inside the substrate 22, and a portion of the first conductive element 21 is printed on the surface of the substrate 22. The portion of the first conductive element 21 is covered by the substrate 22 material, and the substrate 22 can protect the first conductive element 21 located inside the substrate 22.

[0064] In some embodiments, the first conductive element 21 includes a copper foil printed on a substrate 22, for example, by connecting the substrate and the copper foil with a bonding agent such as epoxy resin.

[0065] In some embodiments, the first conductive element 21 covers the surface of the basic 22 that is away from the cell assembly 1. In some embodiments, the first conductive element 21 may be formed by soldering connecting wires and conductive sheets on a printed circuit board. The first conductive element 21 has good current carrying capacity, which is beneficial to improving the safety of the battery module. For example, the conductive sheet may be a copper busbar.

[0066] In some embodiments, such as Figure 2 As shown, the substrate 22 includes a first component 221, a second component 222, and a third component 223, with the first component 221 connected to the second component 222 via the third component 223. A first conductive element 21 covers at least a portion of the third component 223, which is configured to disconnect in response to compression of the cell assembly 1.

[0067] By connecting the third component 223 between the first component 221 and the second component 222, the first component 221, the second component 222 and the third component 223 are made into a whole. In some embodiments, the third component 223 may be an integrally formed structure by mechanical processing such as stamping or cutting of the blank of the substrate 22; or it may be connected into an integral structure of the substrate 22 by welding, bonding or other means.

[0068] In some embodiments, the first conductive element 21 covers at least a portion of the third member 223, and the third member 223 is configured to disconnect in response to compression of the cell assembly 1, such that when the third member 223 disconnects in response to compression of the cell assembly 1, the first conductive element 21 covering it also disconnects, thereby turning off the main circuit. Along a first direction, the projection of the first conductive element 21 overlaps with the projection of the third member 223, such that disconnection of the third member 223 can cause the first conductive element 21 to disconnect.

[0069] In some embodiments, the first conductive element 21 may cover the entire surface of the substrate 22, which is beneficial to further increase the current carrying capacity of the first conductive element 21.

[0070] In some embodiments, the third member 223 includes a first recess 2231, which is disposed facing the cell assembly 1. Along a first direction, the first recess 2231 faces the cell assembly 1; wherein, along the first direction, the thickness of the first recess 2231 is less than the thickness of the first member 221, and the thickness of the first recess 2231 is less than the thickness of the second member 222, such that the first recess 2231 is the region with the smallest thickness on the substrate 22 in the first direction, and the substrate 22 breaks at the first recess 2231 when acted upon by the cell assembly 1 in the first direction.

[0071] The first recess 2231 can be formed on the third component 223 by mechanical processing such as cutting and drilling, which can reduce the structural strength of this part of the area, making the structural strength of this part of the area less than the structural strength of other parts of the substrate 22, so that the third component 223 will break when it is squeezed.

[0072] In some embodiments, the first recess 2231 may be a V-shaped groove with a relatively sharp bottom structure, which makes the part with the first recess 2231 easy to break under the action of external force.

[0073] In some embodiments, along the second direction, the length of the third member 223 is less than the length of the first member 221, and the length of the third member 223 is less than the length of the second member 222. When the cell assembly 1 expands, the cell assembly 1 compresses the third member 223, and the third member 223 breaks under the action of the cell assembly 1. The second direction can be a direction perpendicular to the first direction.

[0074] In some embodiments, such as Figure 4 As shown, the third component 223 has at least one first hole 2232, which penetrates the third component 223 along a first direction. The first hole 2232 can be formed on the substrate 22 by mechanical processing such as drilling, which can reduce the structural strength of this area, so that the third component 223 will break when the substrate 22 is compressed. In some embodiments, multiple first holes 2232 can be provided, and the multiple first holes 2232 are spaced apart along a second direction. When the battery cell assembly 1 expands, the battery cell assembly 1 compresses the third component 223, and the third component 223 breaks under the action of the battery cell assembly 1. The second direction can be a direction perpendicular to the first direction.

[0075] In some embodiments, when the first circuit board 2 is a printed circuit board, the thickness of the printed circuit board can be set to 1.6 mm, and the thickness of the first conductive element 21 disposed thereon can be set to 100 μm. A weak structure can be formed by providing a first recess 2231 on the third member 223. Along the second direction, the width of the third member 223 can be set to a range of 8 mm to 22 mm. For example, along the second direction, the width of the third member 223 can be set to 10 mm or 20 mm. The first recess 2231 can be disposed on the side of the printed circuit board near the cell assembly 1, and the depth of the first recess 2231 can be set to a range of 0.9 mm to 1.3 mm. For example, the depth of the first recess 2231 can be set to 1 mm or 1.2 mm.

[0076] In some embodiments, the thickness of the printed circuit board is set to 1.6 mm, and the thickness of the first conductive element 21 disposed thereon is set to 100 μm. A weak structure can also be formed by providing a first hole 2232 on the third component 223. Along the second direction, the width of the third component 223 can be set to a range of 18 mm to 32 mm. Exemplarily, along the second direction, the width of the third component 223 can be set to 20 mm or 30 mm. The first hole 2232 can be disposed on the side of the printed circuit board near the cell assembly 1. The first hole 2232 can be a through-hole penetrating the printed circuit board, and the diameter of the first hole 2232 can be set to a range of 0.8 mm to 1.7 mm. Exemplarily, the diameter of the first hole 2232 can be set to 1 mm or 1.5 mm.

[0077] In some embodiments, such as Figure 5 As shown, the battery module also includes a fourth component 3. Along the first direction, the fourth component 3 is located between the cell assembly 1 and the first conductive element 21. The fourth component 3 is configured to disconnect the first conductive element 21 when it is squeezed by the cell assembly 1.

[0078] In some embodiments, the fourth component 3 may be a component for cutting the first conductive element 21. It is disposed between the cell assembly 1 and the first conductive element 21 and can cut the first conductive element 21 under the action of the cell assembly 1, thereby disconnecting the first conductive element 21.

[0079] In some embodiments, the fourth component 3 is an insulating component, which further strengthens the insulation between the first conductive component 21 and the battery cell assembly 1.

[0080] In some embodiments, the fourth component 3 is connected to the cell assembly 1, and the fourth component 3 moves as the cell assembly 1 expands. The fourth component 3 presses the first conductive element 21, causing the first conductive element 21 to disconnect.

[0081] In some embodiments, along the first direction, the projection of the fourth component 3 is located within the range of the third component 223. When the fourth component 3 moves along the first direction under the drive of the battery cell assembly 1, it can squeeze the third component 223, causing the third component 223 to disconnect. The first conductive element 21 disconnects in response to the disconnection of the third component 223.

[0082] In some embodiments, the fourth component 3 may be made of a material with greater strength than the third component 223, which is beneficial for the fourth component 3 to compress the third component 223.

[0083] In some embodiments, such as Figure 6 As shown, the fourth component 3 includes a main body 31 and a protrusion 32. Along the first direction, the protrusion 32 protrudes from the main body 31 and extends toward the first conductive member 21. The projection of the protrusion 32 overlaps with the projection of the first conductive member 21 along the first direction.

[0084] In some embodiments, the fourth component 3 can be connected to the cell assembly 1 via the main body 31. By providing a protrusion 32 on the side of the main body 31 facing the first conductive member 21 and extending toward the first conductive member 21, the protrusion 32 can act on the first conductive member 21 when the fourth component 3 moves.

[0085] In some embodiments, the projection of the protrusion 32 along the first direction overlaps with the projection of the first conductive member 21, and when the fourth member 3 moves along the first direction, the protrusion 32 can act on the first conductive member 21.

[0086] Some embodiments of this application also provide a battery pack, which includes a housing 4 and a battery module provided by the above-described technical solution, with at least a portion of the battery module located within the housing 4.

[0087] The housing 4 can be a component used to form a space for accommodating the various components in the battery pack. The space formed can be used to accommodate the cell assembly 1, the first circuit board 2, and other components. The housing 4 can be a split structure, which includes a first housing and a second housing that are interconnected.

[0088] In some embodiments, the first housing and the second housing can be connected to each other by snap-fitting, by adhesive bonding, or by fastening with fasteners such as bolt assemblies.

[0089] In some embodiments, the first circuit board 2 is fixed to the housing 4. For example, the first circuit board 2 can be fixed to the housing 4 by means of bolts, rivets, clips, or other connectors, or by means of adhesives such as glue or double-sided tape. By fixing the first circuit board 2 to the housing 4, the movement of the first circuit board 2 with the expansion of the battery cell assembly 1 is restricted, which is beneficial for the first conductive element 21 to disconnect when it is squeezed.

[0090] In some embodiments, the battery pack further includes a connector 5 configured to connect to an electrical device. The connector 5 may be a wiring component on the battery pack, used for electrical connection between the battery pack and external devices, enabling the battery pack to output and input electrical energy. In some embodiments, the connector 5 includes a connection terminal 51 and a base 52. The connection terminal 51 is connected to the base 52. The connection terminal 51 may be a wiring terminal in the connector 5, enabling quick connection between the battery pack and external devices, improving the ease of connection. The base 52 may be a component connected to the housing 4 or other components in the battery pack. Connecting the connection terminal 51 to the base 52 not only protects the connection terminal 51 from the base 52 but also ensures a secure connection between the connection terminal 51 and the housing 4 or other components in the battery pack.

[0091] In some embodiments, such as Figure 7 and Figure 8 As shown, the first conductive element 21 includes a first part 211, a second part 212, and a third part 213. The first part 211 and the second part 212 are connected through the third part 213. The first part 211 is connected between the connector 5 and the third part 213. The second part 212 is connected between the battery cell assembly 1 and the third part 213. The third part 213 is configured to disconnect when squeezed by the battery cell assembly 1, thereby disconnecting the electrical connection between the first part 211 and the second part 212 and disconnecting the connection between the connector 5 and the battery cell assembly 1.

[0092] The first part 211, the second part 212 and the third part 213 all refer to the partial structures in the first conductive element 21. By connecting the first part 211 and the second part 212 through the third part 213, the different partial structures in the first conductive element 21 can be connected into a whole.

[0093] In some embodiments, the first part 211 is disposed on the first component 221, the second part 212 is disposed on the second component 222, and the third part 213 is disposed on the third component 223, which facilitates the processing and manufacturing of the first circuit board 2.

[0094] In some embodiments, the battery pack further includes a connection portion 100. Optionally, the connection portion 100 is connected between the positive terminal of the cell assembly 1 and the positive terminal of the connection terminal 51; alternatively, the connection portion 100 is connected between the negative terminal of the cell assembly 1 and the negative terminal of the connection terminal 51.

[0095] In some embodiments, such as Figure 8 and Figure 9 As shown, the first electrical connector includes a first segment 61 and a second segment 62 that are separated from each other. The first segment 61 connects the battery cell assembly 1 and the second part 212, and the second segment 62 connects the connector 5 and the first part 211. Optionally, the second segment 62 and the connecting terminal 51 are soldered together. Optionally, the second segment 62 and the connecting terminal 51 are connected via a connecting part 100.

[0096] In some embodiments, such as Figure 9 and Figure 10 As shown, the second segment 62 includes a first connecting segment 621 and a second connecting segment 622 that are separately disposed. The first connecting segment 621 and the second connecting segment 622 are connected to each other. The first connecting segment 621 is connected to the first part 211, and the second connecting segment 622 is connected to the connecting terminal 51 or the connecting part 100 that is electrically connected to the connecting terminal 51, which is beneficial to the connection between the first part 211 and the connector 5.

[0097] In some embodiments, the battery pack further includes a second electrical connection 7. Optionally, such as... Figure 9 As shown, the first electrical connector 6 is connected between the positive terminal of the battery cell assembly 1 and the positive terminal of the connection terminal 51, and the second electrical connector 7 is connected between the negative terminal of the battery cell assembly 1 and the negative terminal of the connection terminal 51. Optionally, the first electrical connector 6 is connected between the negative terminal of the battery cell assembly 1 and the negative terminal of the connection terminal 51, and the second electrical connector 7 is connected between the positive terminal of the battery cell assembly 1 and the positive terminal of the connection terminal 51.

[0098] The battery pack also includes a second circuit board 8 and an insulating support 9. Along the first direction, the second circuit board 8 and the connector 5 are located on the side of the insulating support 9 away from the cell assembly 1, and the first circuit board 2 is located on the side of the insulating support 9 close to the cell assembly 1.

[0099] The second circuit board 8 is electrically connected to multiple battery cells 11 in the battery cell assembly 1. A Battery Management System (BMS) component can be mounted on the BMS component. The BMS component includes multiple electronic components capable of data acquisition, control, protection, communication, power calculation, signal transmission, and energy transmission of the battery cells 11 in the battery cell assembly 1. This enables intelligent management and maintenance of the multiple battery cells 11, which is beneficial for improving the performance and lifespan of the battery pack. In some embodiments, the second circuit board 8 may include a printed circuit board with multiple wires (not shown) connected to the electronic components in the BMS component. In some embodiments, the second circuit board 8 may include a flexible circuit board 7 with multiple wires connected to the electronic components in the BMS component.

[0100] The insulating bracket 9 and the housing 4 are fixedly connected to support and carry other components in the battery pack. The first circuit board 2 is located between the insulating bracket 9 and the cell assembly 1. The battery pack includes a fastener 9, which fixes the insulating bracket 9, the first circuit board 2 and the housing 4, further restricting the movement of the first circuit board 2 as the cell assembly 1 expands, and facilitating the disconnection of the first circuit board 2 when it is compressed.

[0101] In some embodiments, the insulating bracket 9 can be a plastic component. The plastic material provides the insulating bracket 9 with a certain buffering capacity, enabling it to absorb external impacts. In some embodiments, the insulating bracket 9 can be connected to the housing 4 using connecting bolts, rivets, or other fasteners, facilitating the connection between the insulating bracket 9 and the housing 4.

[0102] In some embodiments, the insulating bracket 9 is provided with an opening 91, through which the second segment 62 passes and connects to the connector 5.

[0103] Some embodiments of this application also provide an electrical device that includes a load and a battery pack provided by the above-described technical solution, the battery pack being used to power the load. Because this electrical device includes the battery pack provided by the above-described technical solution, it has higher safety.

[0104] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery module, characterized in that, include: A battery cell assembly includes multiple battery cells arranged along a first direction; A first circuit board is arranged along the first direction, the battery cell assembly and the first circuit board are arranged together, the first circuit board includes a first conductive element disposed on the path of the main circuit of the battery module, the first conductive element is configured to disconnect in response to the compression of the battery cell assembly to shut off the main circuit; The first circuit board includes a substrate, and the first conductive element is printed on the substrate; the substrate includes a first component, a second component, and a third component, and the first component is connected to the second component through the third component; The first conductive element covers at least a portion of the third member, which is configured to disconnect in response to compression of the cell assembly; When the third component responds to the pressure of the cell assembly to disconnect, the first conductive element covering the third component disconnects, causing the first conductive element to shut off the main circuit.

2. The battery module as described in claim 1, characterized in that, The third component includes a first recess, which faces the cell assembly along the first direction. Wherein, along the first direction, the thickness of the first recess is less than the thickness of the first component, and the thickness of the first recess is less than the thickness of the second component.

3. The battery module as described in claim 1, characterized in that, The substrate is provided with at least one first hole, which penetrates the third component along the first direction.

4. The battery module as described in any one of claims 1 to 3, characterized in that, It also includes a fourth component, which is located between the cell assembly and the first conductive element; The fourth component is configured to disconnect the first conductive element when it is squeezed by the cell assembly.

5. The battery module as described in claim 4, characterized in that, The fourth component includes a main body and a protrusion; Along the first direction, the protrusion protrudes from the main body and extends toward the first conductive element; Wherein, along the first direction, the projection of the protrusion overlaps with the projection of the first conductive element.

6. A battery pack, characterized in that, The battery pack includes the battery module as described in any one of claims 1-5, and the battery pack further includes a housing, with at least a portion of the battery module located within the housing.

7. The battery pack as described in claim 6, characterized in that, The first circuit board is fixed to the housing.

8. The battery pack as described in claim 6, characterized in that, It also includes connectors configured to connect to electrical equipment; The first conductive element includes a first part, a second part, and a third part, the first part and the second part being connected through the third part, the first part being connected between the connector and the third part, the second part being connected between the third parts of the cell assembly, and the third part being configured to disconnect when squeezed by the cell assembly.

9. The battery pack according to claim 8, characterized in that, The battery pack further includes a first electrical connector, which includes a first segment and a second segment that are separated from each other. The first segment connects the cell assembly and the second part, and the second segment connects the connector and the first part.

10. The battery pack according to claim 9, characterized in that, The battery pack also includes a second circuit board and an insulating bracket, the second circuit board and the insulating bracket being disposed within the housing; Along the first direction, the second circuit board and the connector are disposed on the side of the insulating bracket away from the cell assembly, and the first circuit board is disposed on the side of the insulating bracket close to the cell assembly.

11. The battery pack according to claim 10, characterized in that, The insulating bracket has an opening, and the second segment passes through the opening and connects to the connector.

12. An electrical appliance, characterized in that, Includes a load and a battery pack as described in any one of claims 6 to 11; The battery pack supplies power to the load.

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