Battery pack

Abstract

The application relates to the technical field of batteries, in particular to a battery pack, which comprises a first shell, a second shell, a third shell and a battery module, the first shell, the second shell and the third shell enclose a containing space; the battery module is located in the containing space; a structural reinforcement part of the first shell and a structural reinforcement part of the second shell are arranged corresponding to the side surface of the battery module; and the third shell is arranged corresponding to the bottom surface of the battery module. The application reduces the number of parts of the shell assembly for assembling the battery module, simplifies the structure of the bottom shell, and finally reduces the production cost of the battery pack while ensuring the normal work of the battery pack.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more particularly to a battery pack. Background Technology

[0002] Currently, the casings of battery modules used in energy storage and power battery fields generally adopt a split assembly structure, mainly composed of multiple components such as an upper flat tube, two independent end plates, a lower flat tube, and a bottom tray. These components are secured together using a large number of bolts and screws. Existing technology has the following drawbacks: a large number and variety of components, high material procurement, warehousing, and management costs, and the need to install multiple components step-by-step, requiring a large number of fasteners, resulting in a cumbersome assembly process. All of these factors are detrimental to controlling the production cost of battery module casings. Summary of the Invention

[0003] This application provides a battery pack that simplifies the structure and assembly process of the battery pack by reducing the number of components in the housing assembly used to assemble the battery module, thereby reducing the production cost of the battery pack while ensuring its normal operation.

[0004] In a first aspect, embodiments of this application provide a battery pack, including a battery module and a housing assembly. The battery module includes multiple battery cells, at least two battery cells are sequentially bonded along a first direction to form two wide surfaces parallel to the first direction, and at least two battery cells are sequentially bonded along a second direction to form two narrow surfaces parallel to the second direction. The direction between the terminal surface and the bottom surface of the battery cell is a third direction, which is perpendicular to the plane formed by the first and second directions. The housing assembly includes a first housing, a second housing, and a third housing. The first housing is bent to form a cavity for accommodating the battery module. The cavity is opposite to one wide surface and also opposite to the two narrow surfaces. The cavity includes a first opening, a second opening, and a third opening. The first opening is opposite to another wide surface, the second opening is opposite to the bottom surface, and the third opening is opposite to the terminal surface. The second housing covers the first opening and is connected to the first housing, and the third housing covers the second opening and is connected to the first housing. Both the first housing and the second housing are provided with structural reinforcement.

[0005] This application uses three main components—a first shell, a second shell, and a third shell—to assemble the battery module housing. The first and second shells, with their two wide cell faces and two narrow cell faces, feature reinforced structures to meet the structural strength requirements of the battery pack. The third shell, corresponding to the bottom surface, does not require additional reinforcement, which simplifies the structure of the housing assembly and reduces the production cost of the battery pack.

[0006] In one possible implementation, the first housing includes a first part, a second part, and a third part. The second and third parts are integrally bent into opposite ends of the first part along a first direction. A structural reinforcement portion of the first part faces a wide surface in a second direction, a structural reinforcement portion of the second part faces a narrow surface in the first direction, and a structural reinforcement portion of the third part faces another narrow surface in the first direction. The second housing is connected to at least one of the second and third parts, and its structural reinforcement portion faces another wide surface in the second direction. The third housing is connected to at least one of the second and third parts, and its third surface faces the bottom surface in a third direction. The first, second, and third housings enclose a receiving space, where the battery module is located. This embodiment reduces the number of components in the housing assembly and simplifies the assembly process by combining independent end plates on both sides with an upper flat tube to form the first housing. The structural reinforcement portions of the first and second housings correspond to the four sides of the battery module. Specifically, the structural reinforcement portions of the first and second parts correspond to the two wide surfaces of the battery module, and the structural reinforcement portions of the second and third parts correspond to the two narrow surfaces of the battery module. Since the third housing corresponds to the bottom surface of the battery module, where the thermal expansion effect is relatively weak, and the first and second housings provide strong structural support, the third housing does not require structural reinforcement. Therefore, this design helps reduce the housing's production cost while ensuring its function of accommodating and protecting the battery module, ultimately reducing the battery pack's production cost while ensuring its normal operation.

[0007] In one possible implementation, the first part includes a first substrate and a first protrusion, with at least a portion of the first protrusion protruding from the first substrate along a second direction. The first protrusion disperses the uniform load and localized concentrated stress borne by the first substrate, improving the bending and impact resistance of the first substrate and preventing the risk of electrode damage and short circuits caused by the inward indentation of the center of the first substrate and compression of the battery module cells. This is beneficial for improving the bending and deformation resistance of the first casing, ultimately ensuring the long-term normal operation of the battery pack.

[0008] In one possible implementation, the first protrusion includes a first reinforcing rib, which protrudes from the first substrate along a second direction. The first reinforcing rib and the second portion are located on different sides of the first substrate along the second direction. The first reinforcing rib protrudes in a direction away from the battery module, ensuring the flatness of the contact surface between the first substrate and the battery module while improving the structural strength of the first substrate. This helps to further improve the bending and deformation resistance of the first housing, ultimately ensuring the long-term normal operation of the battery pack.

[0009] In one possible implementation, the first protrusion further includes a second reinforcing rib, which protrudes from the first substrate along a first direction, with a portion of the second reinforcing rib located in the second portion. The second reinforcing rib enhances the bending and deformation resistance of the first portion under lateral impact, and the portion of the second reinforcing rib protruding from the second portion along the first direction enhances the structural strength of the second portion. This is beneficial for further improving the bending and deformation resistance of the first casing, ultimately ensuring the long-term normal operation of the battery pack.

[0010] In one possible implementation, there are at least two first reinforcing ribs, spaced apart, with a second reinforcing rib positioned between them along a third direction. This allows the stress generated by a lateral impact on the second reinforcing ribs to be concentrated and transmitted to the area of ​​the first portion with stronger structural strength, while less stress is exerted on other weaker areas of the first substrate. This helps to further improve the bending and deformation resistance of the first casing, ultimately ensuring the long-term normal operation of the battery pack.

[0011] In one possible implementation, the second part includes a second substrate and a second protrusion. The second protrusion protrudes from the second substrate along a first direction. The second protrusion and the third part are located on different sides of the second substrate along the first direction. The second protrusion has a through hole and a clearance space, and the clearance space communicates with the space outside the second protrusion through the through hole. The opening and clearance space of the second protrusion can provide an access point and a hooking point for the hooking component of the transfer device, respectively. This can reduce the transfer difficulty and cost of the housing assembly while enhancing the structural strength of the second part, ultimately reducing the production cost of the battery pack.

[0012] In one possible implementation, the second housing includes a main board and a bending portion. A groove is provided in the middle region of the main board, with the opening of the groove facing the first portion. The bending portion protrudes from the main board along a second direction and is located on at least one of the opposite sides of the main board in a third direction. The opening of the groove faces the first portion, meaning the groove wall protrudes outwards away from the receiving space, ensuring the flatness of the contact surface between the main board and the battery module while improving the structural strength of the middle region of the second housing. The groove is centrally located, and the bending portion is situated beside the groove, which helps improve the bending and deformation resistance of the side region of the second housing, ultimately ensuring the long-term normal operation of the battery pack.

[0013] In one possible implementation, the bending portion includes a connecting end and a free end. The connecting end is located on the main board, and the free end is bent toward the groove in a third direction. The bending portion protrudes from the main board and its end is folded inward, forming a double-layer folded edge reinforcing rib structure, further improving the bending and deformation resistance of the second shell.

[0014] In one possible implementation, the third housing is plate-shaped. The second portion has a first positioning part and a second positioning part extending along a first direction and away from the third portion. The first positioning part is connected to the second housing, and the second positioning part is connected to the third housing. The third housing is a one-piece plate structure. Since the third housing corresponds to the bottom of the battery module, the thermal expansion effect at the bottom of the battery module is weak, and the first and second housings provide strong structural support, the third housing can use a one-piece plate structure instead of a traditional irregular bottom tray, which helps to reduce the production cost of the housing assembly.

[0015] In one possible implementation, the battery pack further includes a data acquisition integration component and an insulation component. The data acquisition integration component is located on the side of the battery module facing away from the third housing and is used to acquire physical data of the battery module. Part of the insulation component is located between the battery module and the first housing, part of the insulation component is located between the battery module and the second housing, and part of the battery module is located on the side of the data acquisition integration component facing away from the third housing. The data acquisition integration component can acquire key data such as the temperature and voltage of the battery module in real time to achieve real-time monitoring of the battery module's status. The insulation component provides electrical isolation between the battery module / data acquisition integration component and the external environment, both of which contribute to the long-term safe operation of the battery pack.

[0016] In one possible implementation, the insulation component includes a first insulating sheet and a second insulating sheet. There are at least four first insulating sheets, located between the first part and the battery module, between the second part and the battery module, between the third part and the battery module, and between the second housing and the battery module. The second insulating sheet is laid on the side of the data acquisition integration component facing away from the battery module. The first insulating sheet provides electrical isolation between the four-sided mating structure of the first and second housings and the battery module, while the second insulating sheet provides electrical isolation between the data acquisition integration component and the outer casing of the battery pack, thus further ensuring the long-term safe operation of the battery pack. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the battery pack structure provided in the embodiments of this application; Figure 2 This is a schematic diagram of the battery pack structure without the casing provided in the embodiments of this application; Figure 3 yes Figure 2 The diagram shows the structure of the battery pack with the casing removed from another perspective. Figure 4 yes Figure 2 The diagram shows the structure of the battery pack with the casing removed from another perspective. Figure 5 yes Figure 2 The diagram shows the structure of the battery pack with the casing removed from another perspective. Figure 6 This is a schematic diagram of the mating structure of the first housing and the second housing provided in an embodiment of this application; Figure 7 This is a schematic diagram of the mating structure of the first and third housings provided in an embodiment of this application; Figure 8 This is a schematic diagram of the mating structure between the second insulating sheet and the data acquisition integration component provided in an embodiment of this application; Figure 9 yes Figure 2 The side view of the battery pack with the casing removed is shown. Figure 10 yes Figure 2 The image shows another side view of the battery pack with the casing removed.

[0018] Figure label: 1000-battery pack; 100 - Housing assembly; 200 - Battery module; 201 - Wide face; 202 - Narrow face; 203 - Chamber; 204 - First opening; 205 - Second opening; 206 - Third opening; 300 - Data acquisition integration assembly; 500 - Housing; 400 - Insulating assembly; 401 - First insulating sheet; 402 - Second insulating sheet; 10-First housing; 11-First part; 111-First substrate; 112-First protrusion; 1121-First reinforcing rib; 1122-Second reinforcing rib; 113-First side; 114-Second side; 12-Second part; 121-Second substrate; 122-Second protrusion; 1221-Through hole; 1222-Allowance space; 1223-Connecting part; 1224-Arched part; 123-First positioning part; 124-Second positioning part; 13-Third part; 20 - Second housing; 21 - Main board; 211 - Groove; 212 - First connecting hole; 213 - Second connecting hole; 22 - Bending part; 221 - Connecting end; 222 - Free end; 30 - Third housing; 31 - Flat plate; 311 - Third connecting hole. Detailed Implementation

[0019] For ease of understanding, the relevant technical terms involved in the embodiments of this application will be explained and described below.

[0020] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the term "connection" should be interpreted broadly. For example, "connection" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. The directional terms mentioned in the embodiments of this application, such as "top," "bottom," "inner," "outer," and "side," are only for reference to the directions in the accompanying drawings. Therefore, the directional terms used are for better and clearer explanation and understanding of the embodiments of this application, and are not intended to indicate or imply that the referred device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application. The term "and / or" as used in this application refers to any combination and all possible combinations of one or more of the associated listed items, and includes such combinations.

[0021] Currently, battery module casings used in energy storage and power battery fields generally adopt a split assembly structure, mainly composed of multiple components such as an upper flat tube, two independent end plates, a lower flat tube, and a bottom tray. These components are secured together using numerous bolts and screws. Existing technology has the following drawbacks: a large number and variety of components, resulting in high material procurement, warehousing, and management costs; the need for sequential assembly of multiple components, requiring a large number of fasteners and leading to cumbersome assembly processes; the ease with which multi-component split assembly can lead to accumulated machining and assembly tolerances, resulting in poor component fit accuracy; the overall structural strength of the casing relies entirely on the fastener tightening force, and under conditions such as vehicle bumps and equipment vibrations, screws are prone to loosening, posing safety hazards such as casing deformation and module failure; and the overall material, processing, and assembly costs are high, hindering cost reduction through large-scale production. All of these factors are detrimental to controlling the production cost of battery module casings.

[0022] Figure 1 This is a schematic diagram of the structure of the battery pack 1000 provided in an embodiment of this application. Figure 2 This is a structural diagram of the battery pack 1000 with the casing 500 removed, as provided in the embodiments of this application. Figure 1 and Figure 2As shown, this application proposes a battery pack 1000, which includes a housing assembly 100, a battery module 200, and a casing 500. The casing 500 is used to house the housing assembly 100 and the battery module 200. The battery module 200 may include multiple battery cells, at least two battery cells being sequentially bonded together along a first direction to form two wide surfaces 201 parallel to the first direction, and at least two battery cells being sequentially bonded together along a second direction to form two narrow surfaces 202 parallel to the second direction. The direction between the terminal surface and the bottom surface of the battery cell is a third direction, the first direction being perpendicular to the second direction, and the third direction being perpendicular to the plane formed by the first and second directions. Schematic, the first direction may be the length direction of the battery pack 1000, the second direction may be the width direction of the battery pack 1000, and the third direction may be the height direction of the battery pack 1000. The housing assembly 100 may include a first housing 10, a second housing 20, and a third housing 30. The first housing 10 is bent to form a cavity 203 for accommodating the battery module. The cavity 203 faces a wide surface 201 and two narrow surfaces 202. The cavity 203 may include a first opening 204, a second opening 205, and a third opening 206. The first opening 204 may face the other wide surface 201, the second opening 205 may face the bottom surface, and the third opening 206 may face the terminal surface. The second housing 20 covers the first opening 204 and is connected to the first housing 10. The third housing 30 covers the second opening 205 and is connected to the first housing 10. Both the first housing 10 and the second housing 20 are provided with structural reinforcement. Schematic, the structural reinforcement may be any one or more combinations of reinforcing ribs, reinforcing beams, or concave-convex reinforcing grooves, or any other arbitrary reinforcing structure, as long as it can improve the bending and impact resistance of the first housing 10 and the second housing 20. This application uses three main components—a first housing 10, a second housing 20, and a third housing 30—to form the battery module 200 housing. The first housing 10 and the second housing 20 have reinforcing structures for the two wide faces 201 and two narrow faces 202 of the battery cells, meeting the structural strength requirements of the battery pack 1000. The third housing 30, corresponding to the bottom surface, does not require additional reinforcing members, which helps to simplify the structure of the housing assembly 100 and reduce the production cost of the battery pack 1000.

[0023] Combination Figure 1 and Figure 2As shown, in one possible embodiment, the first housing 10 includes a first portion 11, a second portion 12, and a third portion 13. The second portion 12 and the third portion 13 are integrally bent into opposite ends of the first portion 11 along a first direction. The second portion 12 and the third portion 13 are located on the same side of the first portion 11 in a second direction. Schematably, the first housing 10 may be U-shaped. The opposite sides of the first portion 11 in a third direction are a first side 113 and a second side 114, respectively. The structural reinforcement of the first portion 11 faces a wide surface 201 in the second direction, the structural reinforcement of the second portion 12 faces a narrow surface 202 in the first direction, and the structural reinforcement of the third portion 13 faces another narrow surface 202 in the first direction. The second housing 20 is connected to at least one of the second portion 12 and the third portion 13, that is, the second housing 20 may be connected to both the second portion 12 and the third portion 13 simultaneously, or the second housing 20 may be connected only to the second portion 12, or the second housing 20 may be connected only to the third portion 13. The structural reinforcement of the second housing 20 is opposite to another wide surface 201 in the second direction, that is, the second housing 20 can be arranged opposite to the first part 11. Schematic, the first part 11 and the second housing 20 can be parallel to the two wide surfaces 201 of the battery module 200, respectively. The third housing 30 is located on the first side 113 in the third direction. The third housing 30 is connected to at least one of the second part 12 and the third part 13. The third housing 30 can be arranged opposite to the bottom surface of the battery module in the third direction. The first housing 10, the second housing 20, and the third housing 30 enclose a receiving space. The battery module 200 is located in the receiving space and can include an electrode column surface and a bottom surface arranged opposite to each other in the third direction. The bottom surface can abut against the third housing 30. This application uses three main components—the first housing 10, the second housing 20, and the third housing 30—to form the housing of the battery module 200. The independent end plates on both sides and the upper flat tube are combined to form the first housing 10, reducing the number of parts in the housing assembly 100 and simplifying the assembly process of the housing assembly 100. The structural reinforcements of the first housing 10 and the second housing 20 are provided on the four sides of the battery module. Specifically, the structural reinforcements of the first part 11 and the second housing 20 correspond to the two wide surfaces 201 of the battery module 200, that is, the two end faces of the battery module 200 in the second direction. The structural reinforcements of the second part 12 and the third part 13 correspond to the two narrow surfaces 202 of the battery module 200, that is, the two end faces of the battery module 200 in the first direction. Since the third housing 30 corresponds to the bottom surface of the battery module 200, the thermal expansion effect at the bottom of the battery module 200 is relatively weak, and the first housing 10 and the second housing 20 provide strong structural support, the third housing 30 does not need to be designed with structural reinforcements, which helps to reduce the production cost of the third housing 30.Therefore, the above configuration helps to reduce the production cost of the housing assembly 100 while ensuring the housing assembly 100 can accommodate the battery module 200, and ultimately reduces the production cost of the battery pack 1000 while ensuring the normal operation of the battery pack 1000.

[0024] Combination Figure 1 and Figure 2 As shown, in one possible implementation, the battery pack 1000 may further include a data acquisition integration component 300 and an insulation component 400. The data acquisition integration component 300 is disposed on the side of the battery module 200 facing away from the third housing 30, i.e., the data acquisition integration component 300 may be disposed on the terminal surface. The data acquisition integration component 300 can be used to acquire physical data of the battery module 200. Part of the insulation component 400 is located between the battery module 200 and the first housing 10, part of the insulation component 400 is located between the battery module 200 and the second housing 20, and part of the battery module 200 is located on the side of the data acquisition integration component 300 facing away from the third housing 30. The insulation component 400 can be used to achieve electrical isolation between the battery module 200, the data acquisition integration component 300 and other components of the battery pack 1000.

[0025] Combination Figure 1 and Figure 2 As shown, in one possible implementation, the first part 11 may include a first substrate 111 and a first protrusion 112, with at least a portion of the first protrusion 112 protruding from the first substrate 111 along a second direction. The first protrusion 112 disperses the uniform load and localized concentrated stress borne by the first substrate 111, improving the bending and impact resistance of the first substrate 111 and preventing the risk of electrode damage and short circuits caused by the inward indentation of the center of the first substrate 111 and the compression of the battery cell of the battery module 200. This is beneficial to improving the bending and deformation resistance of the first housing 10, ultimately ensuring the long-term normal operation of the battery pack 1000.

[0026] Combination Figure 1 and Figure 2 As shown, in one possible implementation, the first protrusion 112 may include a first reinforcing rib 1121. The first reinforcing rib 1121 protrudes from the first substrate 111 along a second direction. The first reinforcing rib 1121 and the second portion 12 are located on different sides of the first substrate 111 in the second direction, that is, the first reinforcing rib 1121 protrudes in a direction away from the battery module 200. This can ensure the flatness of the contact surface between the first substrate 111 and the battery module 200 while improving the structural strength of the first substrate 111. This is beneficial to further improve the bending and deformation resistance of the first housing 10, and ultimately ensure the long-term normal operation of the battery pack 1000.

[0027] Combination Figure 1 and Figure 2As shown, in one possible embodiment, the first protrusion 112 further includes a second reinforcing rib 1122. The second reinforcing rib 1122 protrudes from the first substrate 111 along a first direction, and a portion of the second reinforcing rib 1122 is located in the second portion 12. The second reinforcing rib 1122 enhances the bending and deformation resistance of the first portion 11 under lateral impact, and the portion of the second reinforcing rib 1122 protrudes from the second portion 12 along the first direction, enhancing the structural strength of the second portion 12. This is beneficial for further improving the bending and deformation resistance of the first housing 10, ultimately ensuring the long-term normal operation of the battery pack 1000.

[0028] Figure 3 yes Figure 2 The diagram shown is a structural schematic of the battery pack 1000 with the casing 500 removed, viewed from another angle. Figure 2 and Figure 3 As shown, in one possible implementation, a portion of the second reinforcing rib 1122 can protrude along the first direction onto the third part 13 to enhance the structural strength of the third part 13, which is beneficial to enhancing the first housing 10's resistance to bending and deformation under impact from all directions, and ultimately ensuring the long-term normal operation of the battery pack 1000.

[0029] Combination Figure 2 and Figure 3 As shown, in one possible implementation, there are at least two first reinforcing ribs 1121, spaced apart, with a second reinforcing rib 1122 located between the at least two first reinforcing ribs 1121 along a third direction. This allows the stress generated by lateral impact on the second reinforcing rib 1122 to be concentrated and transmitted to the area of ​​the first part 11 with stronger structural strength, while acting less on other weak areas of the first substrate 111. This is beneficial for further improving the bending and deformation resistance of the first housing 10, ultimately ensuring the long-term normal operation of the battery pack 1000. Schematic, the two first reinforcing ribs 1121 can be aligned with the arched portions 1224 of the second reinforcing rib 1122 on the second part 12 or the third part 13, respectively. This is beneficial for improving the transmission efficiency of stress generated by lateral impact on the second reinforcing rib 1122 to the first reinforcing rib 1121, and further improving the impact resistance of the side panels of the first housing 10.

[0030] Combination Figure 2 and Figure 3As shown, in one possible implementation, the second part 12 may include a second substrate 121 and a second protrusion 122. The second protrusion 122 protrudes from the second substrate 121 along a first direction. The second protrusion 122 and the third part 13 are located on different sides of the second substrate 121 in the first direction, that is, the second protrusion 122 protrudes in a direction away from the battery module 200. This can ensure the flatness of the contact surface between the second substrate 121 and the battery module 200 while improving the structural strength of the second substrate 121. The second protrusion 122 may have a through hole 1221 and a clearance space 1222. The clearance space 1222 communicates with the space outside the second protrusion 122 through the through hole 1221. The opening of the second protrusion 122 and the clearance space 1222 can respectively provide an access point and a hooking point for the hooking part of the transfer device. This can reduce the transfer difficulty of the housing assembly 100 while enhancing the structural strength of the second part 12, reducing the transfer cost of the housing assembly 100, and ultimately reducing the production cost of the battery pack 1000. Specifically, the second protrusion 122 includes an integrally formed connecting portion 1223 and an arched portion 1224. The connecting portion 1223 is fitted to the second substrate 121, which helps to increase the contact area between the second protrusion 122 and the second substrate 121 and reduce the pressure on the second substrate 121 when it is subjected to impact. The arched portion 1224 is bent and formed in the connecting portion 1223 along the first direction. The arched portion 1224 and the second substrate 121 enclose a clearance space 1222. The through hole 1221 is located on the side of the arched portion 1224 away from the second substrate 121, which helps the hook of the transfer device to easily pass through the through hole 1221 into the clearance space 1222 to hook the second part 12. In another possible embodiment, the third part 13 may also include the second substrate 121 and the second protrusion 122. This allows both ends of the housing assembly 100 in the first direction to be hooked by the transfer device, which helps to reduce the transfer difficulty of the housing assembly 100 and reduce the transfer cost of the battery pack 1000.

[0031] Figure 4 yes Figure 2 The diagram shown is a structural schematic of the battery pack 1000 with the casing 500 removed, viewed from another angle. Figure 2 , Figure 3 and Figure 4As shown, in one possible implementation, the second housing 20 may include a main board 21 and a bending portion 22. The main board 21 has a groove 211 in its middle region, with the opening of the groove 211 facing the first portion 11. The bending portion 22 protrudes from the main board 21 along a second direction and is located on at least one of the opposite sides of the main board 21 in a third direction. The opening of the groove 211 faces the first portion 11, meaning the groove wall of the groove 211 protrudes outwards from the receiving space, ensuring the flatness of the contact surface between the main board 21 and the battery module 200 while improving the structural strength of the middle region of the second housing 20. The groove 211 is centrally located, and the bending portion 22 is located beside the groove 211, which helps to improve the bending and deformation resistance of the side region of the second housing 20. The combined use of the concave-convex structural reinforcement and the bending structural reinforcement improves the protective effect of the second housing 20 on the battery module 200, ultimately ensuring the long-term normal operation of the battery pack 1000. Schematic, the second housing 20 may be a bent plate. In another possible implementation, there may be two bends 22, which may be located on the two sides of the motherboard 21 in the third direction.

[0032] Combination Figure 2 , Figure 3 and Figure 4 As shown, in one possible implementation, the bending portion 22 may include a connecting end 221 and a free end 222. The connecting end 221 is located on the main board 21, and the free end 222 bends towards the groove 211 along a third direction. The bending portion 22 protrudes from the main board 21 and its end is folded inward, forming a double-layer folded edge reinforcing rib structure, further improving the bending and deformation resistance of the second housing 20. Specifically, the length and width of the main board 21 in the third direction can be 121mm ± 0.5mm. The length and width of the groove 211 in the third direction can be 20mm ± 0.1mm. The length and thickness of the free end 222 in the second direction can be 2mm ± 0.02mm. The distance between the two free ends 222 in the third direction can be 121mm ± 0.4mm.

[0033] Figure 5 yes Figure 2 The diagram shown is a structural schematic of the battery pack 1000 with the casing 500 removed, viewed from another angle. Figure 2 , Figure 3 , Figure 4 and Figure 5As shown, in one possible implementation, the insulating component 400 may include a first insulating sheet 401 and a second insulating sheet 402. The number of first insulating sheets 401 is at least four, and these at least four first insulating sheets 401 are respectively located between the first part 11 and the battery module 200, between the second part 12 and the battery module 200, between the third part 13 and the battery module 200, and between the second housing 20 and the battery module 200. Specifically, at least one first insulating sheet 401 may be disposed between the first part 11 and the battery module 200, at least one second insulating sheet 402 may be disposed between the first part 11 and the battery module 200, and at least one first insulating sheet 401 may be disposed between the first part 11 and the battery module 200. The first insulating sheets 401 are used to electrically isolate the four-sided mating structure of the first housing 10 and the second housing 20 from the battery module 200. The second insulating sheet 402 can be laid on the side of the data acquisition integration component 300 facing away from the battery module 200. The second insulating sheet 402 can be used to electrically isolate the data acquisition integration component 300 from the outer shell of the battery pack 1000. Both the first insulating sheet 401 and the second insulating sheet 402 help ensure the long-term safe operation of the battery pack 1000.

[0034] Figure 6 This is a schematic diagram of the mating structure of the first housing 10 and the second housing 20 provided in the embodiments of this application, combined with... Figure 4 and Figure 6As shown, in one possible implementation, the main board 21 of the second housing 20 is provided with a first connecting hole 212 and a second connecting hole 213, and the number of both the first connecting hole 212 and the second connecting hole 213 can be two. Both the first connecting hole 212 and the second connecting hole 213 can be used to achieve a detachable connection with the first positioning part 123 of the second part 12 under the cooperation of fasteners. Schematic, both the first connecting hole 212 and the second connecting hole 213 can be threadedly connected to the positioning groove of the first positioning part 123 by riveting nuts. Specifically, the first connecting hole 212 can be racetrack-shaped, that is, it is composed of two semi-circular through holes 1221 located at both ends and a rectangular through hole 1221 located within the two semi-circular through holes 1221. Schematic, the radius of the two semi-circular through holes 1221 is 3mm ± 0.1mm, that is, the diameter is 6mm ± 0.2mm. The length of the rectangular through hole 1221 in the first direction can be 3mm ± 0.1mm. The second connecting hole 213 can be circular, with a radius of 3mm ± 0.1mm (i.e., a diameter of 6mm ± 0.2mm). The distance between the two first connecting holes 212 can be 85mm ± 0.5mm, and the distance between the two second connecting holes 213 can also be 85mm ± 0.5mm. The distance between the first connecting holes 212 and the second connecting holes 213 in the first direction can be 420mm ± 0.3mm. The distance between the second connecting hole 213 and the side of the motherboard 21 furthest from the first connecting hole 212 in the first direction can be 11.5mm ± 0.3mm.

[0035] Combination Figure 4 and Figure 6 As shown, in one possible implementation, the length of the second housing 20 in the second direction, i.e., the thickness of the second housing 20, can be 10 mm ± 0.3 mm. The length of the second housing 20 in the first direction, i.e., the length of the second housing 20, can be 443 mm ± 0.5 mm.

[0036] Figure 7 This is a schematic diagram of the mating structure of the first housing 10 and the third housing 30 provided in the embodiments of this application, combined with... Figure 2 and Figure 7As shown, in one possible implementation, the third housing 30 can be plate-shaped. The second part 12 is provided with a first positioning part 123 and a second positioning part 124 extending along a first direction and away from the third part 13. The first positioning part 123 is fastened to the second housing 20, and the second positioning part 124 is fastened to the third housing 30. This simplifies the connection structure between the first housing 10, the second housing 20, and the third housing 30, streamlines the assembly process of the battery pack 1000, and facilitates the adaptation of the battery pack 1000 to automated production. The third housing 30 is an integral plate structure. Since the third housing 30 corresponds to the bottom of the battery module 200, the thermal expansion effect at the bottom of the battery module 200 is relatively weak, and the first housing 10 and the second housing 20 provide strong structural support, the third housing 30 can use an integral plate structure instead of a traditional irregular bottom tray, which helps to reduce the production cost of the housing assembly 100. Specifically, the third housing 30 may include a flat plate 31, which has two third connecting holes 311. The flat plate 31 can be threadedly connected to the first positioning part 123 of the second part 12 and the second positioning part 124 of the third part 13 through the two third connecting holes 311, respectively. The third connecting holes 311 may have countersunk stepped holes, that is, through holes 1221 with two different diameters. The through holes 1221 penetrate the flat plate 31, completely passing through both sides of the flat plate 31. The through holes 1221 are used for fasteners to pass through, such as positioning pins and bolts. When screws are installed, the countersunk stepped holes allow the screw head to be completely embedded in the surface of the flat plate 31 without protruding from it, which helps to ensure the subsequent assembly and fit of the third housing 30 with other components, i.e., a flat contact surface. Schematic, the diameter of the through hole 1221 of the third connecting hole 311 can be 5mm ± 0.02mm, the diameter of the countersunk step hole of the third connecting hole 311 can be 7.4mm ± 0.02mm, the distance between the two third connecting holes 311 in the first direction can be 426mm ± 0.3mm, and the length of the plate 31 in the first direction can be 436mm ± 0.3mm. The length of the plate 31 of the third housing 30 in the third direction, i.e., the thickness of the plate 31 of the third housing 30, can be 1.5mm ± 0.01mm. The length of the plate 31 of the third housing 30 in the second direction, i.e., the width of the plate 31 of the third housing 30, can be 118mm ± 0.5mm.

[0037] Figure 8 This is a schematic diagram of the mating structure between the second insulating sheet 402 and the data acquisition integration component 300 provided in the embodiments of this application. Figure 2 , Figure 5 and Figure 8 As shown, in one possible implementation, the second insulating sheet 402 can be laid on the side of the data acquisition integration assembly 300 away from the battery module 200, and the second insulating sheet 402 can be used to electrically isolate the data acquisition integration assembly 300 from the outer shell of the battery pack 1000.

[0038] Figure 9 yes Figure 2 The side view shown is of the battery pack 1000 with the casing 500 removed, combined with... Figure 2 and Figure 9 As shown, in one possible embodiment, the length of the second part 12 of the first housing 10 in the second direction can be 135.4 mm ± 0.3 mm. The length of the first part 11 of the first housing 10 in the first direction can be 429 mm ± 0.5 mm. The distance between the rivet nut on the second positioning part 124 of the second part 12 of the first housing 10 and the first positioning part 123 in the second direction can be 67.7 mm ± 0.3 mm. The second positioning part 124 of the third part 13 of the first housing 10 also has a rivet nut, meaning there can be two rivet nuts, and the thread fit size of the rivet nuts can be 5 mm ± 0.01 mm. The length of the through hole 1221 of the second protrusion 122 in the second direction can be 20.6 mm ± 0.1 mm. The distance between the through holes 1221 of the two second protrusions 122 in the third direction can be 85 mm ± 0.1 mm. The through hole 1221 can be racetrack-shaped, consisting of two semi-circular through holes 1221 located at both ends and a rectangular through hole 1221 located between the two semi-circular through holes 1221. Schematic, the radius of each of the two semi-circular through holes 1221 is 4mm ± 0.1mm, i.e., the diameter is 8mm ± 0.2mm. The protrusion height of the first reinforcing rib 1121 can be 8mm ± 0.1mm, and the protrusion height of the second reinforcing rib 1122 in the second direction can also be 8mm ± 0.1mm.

[0039] Figure 10 yes Figure 2 The image shown is a view of the battery pack 1000 with the casing 500 removed, combined with... Figure 2 , Figure 4 and Figure 10As shown, in one possible implementation, the distance between the two furthest connecting holes on the first positioning part 123 in the third direction can be 140mm ± 0.2mm. The distance between the middle connecting hole and the two side connecting holes on the first positioning part 123 in the third direction can be 70mm ± 0.1mm. The distance between the two end connecting holes on the first positioning part 123 and their respective adjacent ends in the third direction can be 22.6mm ± 0.3mm. The distance between the connecting holes on the two first positioning parts 123 in the first direction can be 462.8mm ± 0.8mm. The distance between the positioning grooves on the two first positioning parts 123 in the first direction can be 420mm ± 0.5mm. The distance between the two positioning grooves on the first positioning part 123 in the third direction can be 85mm ± 0.2mm. The distance between the rivet nuts on the two second positioning parts 124 in the first direction can be 426mm ± 0.5mm. The thread adaptation size of the rivet nuts on the second positioning parts 124 can be 4mm ± 0.01mm.

[0040] See Figure 2 , Figure 4 and Figure 9 The assembly process of the battery pack 1000 can be as follows: First, at least three first insulating sheets 401 are respectively set on the side of the first part 11, the second part 12 and the third part 13 facing the receiving space, and the third housing 30 is connected to the two second positioning parts 124 of the U-shaped plate, i.e. the first housing 10; the battery module 200 is placed into the receiving space and placed on the bottom plate 31, i.e. the third housing 30; at least one first insulating sheet 401 is set on the side of the battery module 200 away from the receiving space and exposed; the bending plate, i.e. the second housing 20, is connected to the two first positioning parts 123 of the first housing 10; the acquisition integration component 300 is set on the terminal surface of the battery module 200, and the second insulating sheet 402 is laid on the side of the acquisition integration component 300 away from the third housing 30. Align the lower end of the first housing 10 with the second housing 20 and the third housing 30 through the positioning groove, and lock them together using clips and a few screws to complete the assembly of the battery module 200, the data acquisition integration component 300, the insulation component 400, and the housing component 100. Finally, place them in the housing 500 to complete the assembly of the battery pack 1000.

[0041] In summary, this application provides a battery pack that simplifies the structure and assembly process by reducing the number of components in the housing assembly used to assemble the battery module, ultimately reducing the production cost of the battery pack while ensuring its normal operation. Specifically, it offers the following advantages: Cost reduction and efficiency improvement: Significantly reduces the types and quantities of components, lowering material management, processing, and procurement costs; significantly reduces the amount of fasteners used, simplifies the assembly process, improves assembly efficiency, and adapts to automated production lines; High structural reliability: The U-shaped plate, i.e., the first housing, is integrally formed, eliminating weak points in the connection of multiple components. Combined with the structural reinforcement design, the overall rigidity, vibration resistance, and impact resistance of the housing are superior to traditional split structures, making it less prone to loosening and deformation over long-term use; High assembly precision: Integrated components reduce the accumulation of processing tolerances, ensure precise component alignment, and improve the overall consistency of the module; Strong versatility: The simple structure and wide adaptability allow it to be applied to energy storage batteries and power battery modules of different specifications, making it highly valuable for widespread adoption.

[0042] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit it. 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 of the technical features. Such 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.

Claims

1. A battery pack, characterized in that, include: A battery module includes multiple battery cells, at least two of the battery cells are sequentially bonded together along a first direction to form two wide surfaces parallel to the first direction, and at least two of the battery cells are sequentially bonded together along a second direction to form two narrow surfaces parallel to the second direction. The direction between the terminal surface of the battery cell and the bottom surface of the battery cell is a third direction, which is perpendicular to the plane formed by the first direction and the second direction. The housing assembly includes a first housing, a second housing, and a third housing. The first housing is bent to form a cavity for accommodating the battery module. The cavity faces one of the wide surfaces and two of the narrow surfaces. The cavity includes a first opening, a second opening, and a third opening. The first opening faces the other wide surface, the second opening faces the bottom surface, and the third opening faces the terminal post surface. The second housing covers the first opening and is connected to the first housing. The third housing covers the second opening and is connected to the first housing. Both the first housing and the second housing are provided with structural reinforcement.

2. The battery pack according to claim 1, characterized in that, The first housing includes a first part, a second part, and a third part. The second part and the third part are integrally bent and formed at opposite ends of the first part along the first direction. The structural reinforcement of the first part faces a wide surface in the second direction, the structural reinforcement of the second part faces a narrow surface in the first direction, and the structural reinforcement of the third part faces another narrow surface in the first direction. The second housing is connected to at least one of the second part and the third part, and the structural reinforcement of the second housing faces another wide surface in the second direction. The third housing is connected to at least one of the second part and the third part, and the third housing faces the bottom surface in the third direction. The first housing, the second housing, and the third housing enclose a receiving space, and the battery module is located in the receiving space.

3. The battery pack according to claim 2, characterized in that, The first part includes a first substrate and a first protrusion, at least a portion of the first protrusion protruding from the first substrate along the second direction.

4. The battery pack according to claim 3, characterized in that, The first protrusion includes a first reinforcing rib, which protrudes from the first substrate along the second direction, and the first reinforcing rib and the second portion are located on different sides of the first substrate in the second direction.

5. The battery pack according to claim 4, characterized in that, The first protrusion further includes a second reinforcing rib, which protrudes from the first substrate along the first direction, with a portion of the second reinforcing rib located in the second portion.

6. The battery pack according to claim 5, characterized in that, The number of the first reinforcing ribs is at least two, and the at least two first reinforcing ribs are spaced apart. The second reinforcing rib is located between the at least two first reinforcing ribs along the third direction.

7. The battery pack according to claim 2, characterized in that, The second part includes a second substrate and a second protrusion. The second protrusion protrudes from the second substrate along the first direction. The second protrusion and the third part are located on different sides of the second substrate in the first direction. The second protrusion has a through hole and a clearance space. The clearance space communicates with the space outside the second protrusion through the through hole.

8. The battery pack according to claim 2, characterized in that, The second housing includes a main board and a bending portion. The main board has a groove in the middle region, the opening of the groove facing the first portion. The bending portion protrudes from the main board along the second direction and is located on at least one of the opposite sides of the main board in the third direction.

9. The battery pack according to claim 8, characterized in that, The bending portion includes a connecting end and a free end. The connecting end is located on the motherboard, and the free end bends toward the groove along the third direction.

10. The battery pack according to claim 2, characterized in that, The third housing is plate-shaped. The second part is provided with a first positioning part and a second positioning part extending along the first direction and away from the third part. The first positioning part is connected to the second housing, and the second positioning part is connected to the third housing.

11. The battery pack according to claim 2, characterized in that, The battery pack further includes a data acquisition integration component and an insulation component. The data acquisition integration component is disposed on the side of the battery module away from the third housing and is used to acquire physical data of the battery module. Part of the insulation component is located between the battery module and the first housing, part of the insulation component is located between the battery module and the second housing, and part of the battery module is located on the side of the data acquisition integration component away from the third housing.

12. The battery pack according to claim 11, characterized in that, The insulating component includes a first insulating sheet and a second insulating sheet. The number of the first insulating sheets is at least four. The at least four first insulating sheets are respectively located between the first part and the battery module, between the second part and the battery module, between the third part and the battery module, and between the second housing and the battery module. The second insulating sheet is laid on the side of the acquisition integration component away from the battery module.

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