Battery pack

Abstract

The utility model relates to the technical field of battery packs, and particularly discloses a battery pack. The battery pack comprises a box shell and at least one connecting plug, wherein the box shell is fixedly connected with the connecting plug through a plurality of locking pieces; the connecting plug comprises a shell and a connecting bar; the shell is provided with an assembly surface, a sealing ring is embedded in the assembly surface, the sealing ring protrudes out of the shell, a first hole penetrates through the sealing ring, and the sealing ring is clamped between the inner wall of the box shell and the shell; the connecting bar is connected to the shell in a penetrating mode and penetrates through the first hole. According to the battery pack, the structures of the shell, the sealing ring and the connecting row are improved, so that the sealing and waterproof capability of the connecting plug is guaranteed, and the condition of liquid leakage of the connecting plug mounted on the box shell is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of battery packs, in particular to a battery pack. Background Art

[0002] Batteries, as a more environmentally friendly energy source, have seen rapid development in recent years and are widely used in electric vehicles. To provide sufficient power for electric vehicles, multiple batteries are typically connected in series and parallel to form a battery pack, which is then installed in the vehicle. The battery pack consists of a housing and connectors extending from the housing. The battery pack is electrically connected to the vehicle structure via the connectors.

[0003] Currently, most battery packs on the market achieve waterproofing through the insertion of connectors into the housing, typically secured with bolts. However, when the battery pack uses an immersion-type liquid cooling solution, the waterproof seal at the connectors cannot be guaranteed, leading to the risk of leakage. Utility Model Content

[0004] The purpose of the utility model is to provide a battery pack to ensure the sealing and waterproof capability of the plug connector and to avoid leakage of the plug connector installed on the box shell.

[0005] To achieve this purpose, the present invention adopts the following technical solutions:

[0006] A battery pack includes a box shell and at least one plug connector, wherein the box shell and the plug connector are fixedly connected by a plurality of locking parts; the plug connector includes a shell and a connecting bar; the shell has an assembly surface, the assembly surface is embedded with a sealing ring, the sealing ring protrudes from the shell, the sealing ring is penetrated by a first hole, and the sealing ring is clamped between the inner wall of the box shell and the shell; the connecting bar is connected to the shell, and the connecting bar passes through the first hole.

[0007] As an optional technical solution for the battery pack, the side surfaces of the connecting row are concavely provided with a plurality of grooves, and the shell is convexly provided with protrusions, the number of the protrusions is the same as the number of the grooves, and each of the protrusions matches and fills one of the grooves.

[0008] As an optional technical solution for the battery pack, the assembly surface is concavely provided with a limiting groove, the sealing ring is inserted into the limiting groove, and the sealing ring and the limiting groove are interference fit.

[0009] As an optional technical solution for the battery pack, the sealing ring is further penetrated by a plurality of second holes, all of which are circumferentially arranged around the first hole. The shell is also provided with connecting parts, the number of which is the same as the number of the second holes, and each of the connecting parts is inserted into one of the second holes. The locking member passes through the sealing ring and is fixed to the shell.

[0010] As an optional technical solution for the battery pack, the shell is a cuboid, the assembly surface is a rectangle, and there are four connecting parts, which are distributed at the four corners of the assembly surface.

[0011] As an optional technical solution for the battery pack, the locking part includes a locking bolt; the connecting portion is recessed with a blind hole, an embedded nut is embedded in the blind hole, and the locking bolt extends into the blind hole and cooperates with the embedded nut thread.

[0012] As an optional technical solution for the battery pack, the connecting bar insert is injection molded into the shell; and / or the embedded nut insert is injection molded into the shell.

[0013] As an optional technical solution for the battery pack, the battery pack also includes a battery assembly and an immersion liquid. The box shell is filled with the immersion liquid, the battery assembly is installed in the box shell, and two plug connectors are provided. The two plug connectors are respectively connected to the two ends of the battery assembly. The plug connector is installed in the box shell and partially extends out of the box shell.

[0014] As an optional technical solution for the battery pack, the box shell is also provided with two mounting holes and several positioning holes, each of the locking members passes through one of the positioning holes, and each of the plug connectors is connected to one of the mounting holes; the shell also includes a sleeve, which extends in a direction perpendicular to the assembly surface, the inner wall of the sleeve matches and fits with the surface of the connecting row, and the outer wall of the sleeve fits with the hole wall of the mounting hole.

[0015] As an optional technical solution for the battery pack, a reinforcement plate is provided at each end of the battery assembly, the thickness of the reinforcement plate is greater than the thickness of the connecting bar, and the reinforcement plate and the connecting bar are fixed by pressure riveting.

[0016] As an optional technical solution for the battery pack, the battery assembly includes multiple busbars and several battery cells. All of the battery cells are connected in series in sequence. Two adjacent battery cells are connected by a busbar, and the battery cells located at the edge are connected to the reinforcement plate through a busbar.

[0017] As an optional technical solution for the battery pack, the shell is integrally injection molded.

[0018] Beneficial effects of the utility model:

[0019] The battery pack adopts a structural layout in which a sealing ring is clamped between the inner wall of the box shell and the shell, which optimizes the connection method of the plug connector on the box shell and ensures the sealing ability and waterproof effect of the plug connector. The battery pack with the above structural definition is simple and reliable, with good sealing effect, high connection stability, convenient assembly and disassembly, and long service life. By embedding the sealing ring on the assembly surface of the plug connector, the fixed installation of the sealing ring on the shell is achieved; according to the definition of the connecting row passing through the first hole, the relative position relationship between the connecting row and the sealing ring is determined, thereby achieving the design purpose of waterproofing between the shell and the box shell by using the sealing ring; combined with the definition of the sealing ring protruding from the shell, it is helpful to achieve relative position fixation through the interference fit between the sealing ring and the shell. Based on this, by improving the structure of the shell, the sealing ring and the connecting row, the sealing and waterproof ability of the plug connector can be guaranteed, and leakage of the plug connector installed on the box shell can be avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic structural diagram of the plug connector provided by an embodiment of the present invention from a first perspective;

[0021] Figure 2 This is a schematic structural diagram of the plug connector provided by an embodiment of the present invention from a second perspective;

[0022] Figure 3 This is an exploded view of the plug connector provided by an embodiment of the present invention from a second perspective;

[0023] Figure 4 yes Figure 2 Cross-sectional view of the middle AA plane;

[0024] Figure 5 This is a schematic structural diagram of a battery pack provided by an embodiment of the present utility model;

[0025] Figure 6 This is a schematic structural diagram of the plug connector, reinforcement plate and busbar provided in an embodiment of the present utility model;

[0026] Figure 7 It is a structural schematic diagram of the box shell provided by an embodiment of the utility model.

[0027] In the picture:

[0028] 100. Plug connector; 110. Connecting bar; 111. Rivet hole; 112. Bolt hole; 113. Groove; 120. Housing; 121. Blind hole; 122. Limiting groove; 123. Connecting part; 124. Sleeve; 130. Embedded nut; 140. Sealing ring; 141. First hole; 142. Second hole; 200. Reinforcement plate; 300. Busbar; 400. Battery cell; 500. Box housing; 510. Positioning hole; 520. Mounting hole; 600. Immersion liquid; 700. Locking piece. DETAILED DESCRIPTION

[0029] The following is a clear and complete description of the technical solution of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0030] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and are not intended to indicate or imply that the devices or elements referred to must have a specific position, be constructed and operated in a specific position, and therefore should not be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions, and the first feature being "above", "above" and "above" the second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is at a higher level than the second feature. The first feature being "below", "below" and "below" the second feature includes the first feature being directly below and obliquely below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0031] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0032] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0033] like Figures 1 to 7 As shown, this embodiment provides a battery pack, including a box housing 500 and at least one plug connector 100, the box housing 500 and the plug connector 100 being fixedly connected via a plurality of locking members 700; the plug connector 100 including a housing 120 and a connecting bar 110; the housing 120 having an assembly surface, the assembly surface being embedded with a sealing ring 140, the sealing ring 140 protruding from the housing 120, the sealing ring 140 having a first hole 141 extending therethrough, and the sealing ring 140 being sandwiched between the inner wall of the box housing 500 and the housing 120; the connecting bar 110 being connected to the housing 120 and passing through the first hole 141. Specifically, the connecting bar 110 is a copper bar.

[0034] The battery pack adopts a structural layout in which the sealing ring 140 is sandwiched between the inner wall of the box shell 500 and the shell 120, which optimizes the connection method of the plug connector 100 on the box shell 500 and ensures the sealing ability and waterproof effect of the plug connector 100. The battery pack with the above structural definition is simple and reliable, with good sealing effect, high connection stability, convenient assembly and disassembly, and long service life. By embedding the sealing ring 140 on the assembly surface of the plug connector 100, the sealing ring 140 is fixedly installed on the shell 120; according to the definition of the connection row 110 passing through the first hole 141, the relative position relationship between the connection row 110 and the sealing ring 140 is determined, thereby achieving the design purpose of waterproofing the shell 120 and the box shell 500 by using the sealing ring 140; combined with the definition that the sealing ring 140 protrudes from the shell 120, it is helpful to achieve relative position fixation through the interference fit between the sealing ring 140 and the shell 120. Therefore, by improving the structures of the housing 120 , the sealing ring 140 and the connecting bar 110 , the sealing and waterproofing capability of the plug connector 100 is ensured, and leakage of the plug connector 100 installed on the box housing 500 is avoided.

[0035] In this embodiment, there is a gap between the housing 120 and the box housing 500. The above definition avoids the situation where the housing 120 abuts against the box housing 500, so that the sealing ring 140 can deform as expected to fill the gap, which helps to improve the sealing ability of the sealing ring 140.

[0036] In this embodiment, the sealing ring 140 is further penetrated by a plurality of second holes 142, all of which are circumferentially arranged around the first hole 141, and the shell 120 is further provided with connecting portions 123, the number of connecting portions 123 being the same as the number of the second holes 142, and each connecting portion 123 is inserted into a second hole 142, and the locking member 700 passes through the sealing ring 140 and is fixed to the shell 120.

[0037] By ensuring that all connecting portions 123 are inserted into second holes 142, the relative position between sealing ring 140 and housing 120 is fixed, reducing the risk of accidental displacement of sealing ring 140 and ensuring the seal between sealing ring 140 and housing 120. Furthermore, the circumferential arrangement of all second holes 142 around first hole 141 aligns the relative position of locking member 700 and connecting row 110, optimizing the stress on housing 120 and improving the structural layout of plug connector 100.

[0038] The design of using a locking piece 700 to fix the connection between the box shell 500 and the plug connector 100 allows the plug connector 100 to be locked to the box shell 500 from the outside of the box shell 500, thereby reducing the difficulty of disassembling and assembling the locking piece 700, avoiding direct contact between the locking piece 700 and the liquid in the box shell 500, thereby greatly reducing the risk of rust damage to the locking piece 700, and avoiding the problem of liquid leakage at the connection between the locking piece 700 and the box shell 500.

[0039] In this embodiment, the housing 120 is a cuboid with a rectangular mounting surface. Four connecting portions 123 are provided, located at the four corners of the mounting surface. By defining the shape of the housing 120 and the locations of the connecting portions 123 as described above, the specific structure of the housing 120 and the locations of the connecting portions 123 can be determined. This allows the connection position of the locking member 700 and the plug connector 100 to be planned, simplifying the specific structure of the plug connector 100 and improving the stress response of the housing 120, thereby extending the service life of the plug connector 100.

[0040] Exemplarily, the locking member 700 includes a locking bolt; the connecting portion 123 is recessed with a blind hole 121, and an embedded nut 130 is embedded in the blind hole 121. The locking bolt extends into the blind hole 121 and is threadedly engaged with the embedded nut 130. Specifically, the embedded nut 130 is an M4×8 nut. The design of connecting the locking bolt and the embedded nut 130 enables a detachable connection between the locking member 700 and the plug connector 100, thereby ensuring the installation stability of the plug connector 100 on the box housing 500. By opening the blind hole 121 at the position corresponding to the embedded nut 130 on the assembly surface, the locking of the plug connector 100 and the box housing 500 is achieved entirely on the assembly surface, thereby reducing the locations of leakage on the plug connector 100 and thus reducing the risk of leakage.

[0041] In one implementation of this embodiment, the connecting bar 110 and the embedded nut 130 are both insert-molded into the housing 120. The above definition improves the connection stability of the connecting bar 110 and the embedded nut 130 on the housing 120, ensures the fixed position, reduces the risk of the connecting bar 110 and the embedded nut 130 falling off, ensures the long-term stable operation of the plug connector 100, reduces the risk of battery pack leakage and damage, and helps to extend the service life of the battery pack.

[0042] In another implementation of this embodiment, only the connecting bar 110 is insert-molded into the housing 120 . In yet another implementation of this embodiment, only the embedded nut 130 is insert-molded into the housing 120 .

[0043] In this embodiment, the side of the connecting bar 110 is provided with a plurality of grooves 113, and the housing 120 is provided with protrusions. The number of protrusions is the same as the number of grooves 113, and each protrusion matches and fills one groove 113. Specifically, the connecting bar 110 is a rectangular parallelepiped, with two grooves 113 on each side of the connecting bar 110. The structural coordination of the grooves 113 and the protrusions increases the pulling force between the connecting bar 110 and the housing 120, reduces the risk of accidental relative displacement of the connecting bar 110 and the housing 120, helps to improve the sealing effect between the connecting bar 110 and the housing 120, and prolongs the service life of the plug connector 100.

[0044] For example, the assembly surface is recessed with a limiting groove 122, and the sealing ring 140 is inserted into the limiting groove 122, and the sealing ring 140 and the limiting groove 122 have an interference fit. Through the interference fit between the sealing ring 140 and the limiting groove 122, the relative position between the sealing ring 140 and the housing 120 can be fixed by means of dimensional interference fit and positioning of the limiting groove 122, thereby ensuring a tight fit between the sealing ring 140 and the housing 120, which helps to ensure the waterproof effect of the sealing ring 140 between the housing 120 and the box housing 500.

[0045] The housing 120 is made of plastic. In this embodiment, the housing 120 is integrally injection molded. This solution achieves this by first assembling the connector bar 110 and the embedded nut 130 in place in a mold, followed by injection molding. This ensures a seamless fit between the housing 120, the embedded nut 130, and the connector bar 110, effectively reducing the risk of leakage. The aforementioned protrusions are obtained by completely filling the grooves 113 during injection molding.

[0046] In this embodiment, the outer surface of the embedded nut 130 has an anti-slip layer. The provision of the anti-slip layer can increase the contact area between the outer surface of the embedded nut 130 and the housing 120, thereby reducing the risk of the embedded nut 130 moving or rotating relative to the housing 120, thereby ensuring the stable operation of the embedded nut 130 and extending the service life of the plug connector 100.

[0047] The battery pack also includes a battery assembly and an immersion liquid 600. The box shell 500 is filled with the immersion liquid 600. The battery assembly is installed in the box shell 500. Two plug connectors 100 are provided. The two plug connectors 100 are respectively connected to the two ends of the battery assembly. The plug connectors 100 are installed in the box shell 500 and partially extend out of the box shell 500.

[0048] By sealing the plug connector 100 on the box housing 500 , the plug connector 100 can be used to achieve waterproofing of a single socket in the case of immersion liquid cooling, thereby preventing leakage of the immersion liquid 600 in the box housing 500 .

[0049] In this embodiment, the housing 500 is further provided with two mounting holes 520 and a plurality of positioning holes 510. Each locking member 700 passes through a positioning hole 510, and each plug connector 100 is connected to a mounting hole 520. The housing 120 also includes a sleeve 124, which extends in a direction perpendicular to the assembly surface. The inner wall of the sleeve 124 matches and fits with the surface of the connecting bar 110, and the outer wall of the sleeve 124 fits with the wall of the mounting hole 520. The provision of the mounting holes 520 and positioning holes 510 enables smooth connection between the plug connector 100 and the locking member 700 on the housing 500, ensures a tight fit between the sleeve 124 and the housing 500, and between the connecting bar 110 and the sleeve 124, further ensuring waterproofing and a fixed relative position between the connecting bar 110 and the housing 500, and helping to ensure the long-term stable operation of the battery pack.

[0050] The end of the connecting bar 110 extending out of the box housing 500 is penetrated by a bolt hole 112 , and the end located inside the box housing 500 is penetrated by a rivet hole 111 .

[0051] Exemplarily, a reinforcement plate 200 is provided at each end of the battery assembly. The thickness of the reinforcement plate 200 is greater than the thickness of the connecting bar 110, and the reinforcement plate 200 is fixed to the connecting bar 110 by pressure riveting. Specifically, the reinforcement plate 200 is a CCS output stage reinforcement plate. In this embodiment, the reinforcement plate 200 is riveted to the connecting bar 110 using a pressure riveting process, and then welded to the connecting bar 110. The above design reduces the difficulty of welding the battery assembly and the plug connector 100. The relative position relationship between the connecting bar 110 and the reinforcement plate 200 can be determined by the pressure riveting hole 111, thereby facilitating the determination of the subsequent welding position. Combined with the limitation that the thickness of the reinforcement plate 200 is greater than the thickness of the connecting bar 110, the current capacity of the battery pack is enhanced to achieve a better reinforcement effect.

[0052] The reinforcement plate 200 and the connection bar 110 are locked together by welding, and the welded connection structure is safe and reliable. The above improvement replaces the conventional bolt locking structure, thereby avoiding the problem of loosening and back-twisting of the bolts in the immersion liquid 600 of the battery pack.

[0053] Furthermore, the battery assembly includes multiple busbars 300 and several battery cells 400. All battery cells 400 are connected in series, with adjacent battery cells 400 connected via a busbar 300. Battery cells 400 located at the edge are connected to the reinforcing plate 200 via a busbar 300. This structure, in which the battery cells 400 are connected in series via busbars 300, achieves structural integration of the battery assembly, ensures stable operation of the battery assembly, reduces production costs, and reduces the space occupied by the battery assembly.

[0054] Among them, the specific structure and setting method of the busbar 300 and the battery cell 400 are common knowledge in this field and are well known to technical personnel in this field. The connection method between the busbar 300 and the battery cell 400 and the connection method between the busbar 300 and the reinforcement plate 200 are conventional technical means in this field and are mastered by technical personnel in this field, so they will not be elaborated here.

[0055] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. Those skilled in the art will appreciate that other variations or modifications can be made based on the above description. It is not necessary and impossible to enumerate all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A battery pack, characterized in that: The invention comprises a box shell (500) and at least one plug connector (100), wherein the box shell (500) and the plug connector (100) are fixedly connected via a plurality of locking members (700); the plug connector (100) comprises a shell (120) and a connecting bar (110); the shell (120) has an assembly surface, a sealing ring (140) is embedded in the assembly surface, the sealing ring (140) protrudes from the shell (120), a first hole (141) is passed through the sealing ring (140), and the sealing ring (140) is sandwiched between the inner wall of the box shell (500) and the shell (120); the connecting bar (110) is connected to the shell (120), and the connecting bar (110) passes through the first hole (141).

2. The battery pack according to claim 1, wherein: The side surface of the connection row (110) is concavely provided with a plurality of grooves (113), and the housing (120) is convexly provided with protrusions, the number of the protrusions is the same as the number of the grooves (113), and each of the protrusions matches and fills one of the grooves (113).

3. The battery pack according to claim 1, wherein: The assembly surface is concavely provided with a limiting groove (122), the sealing ring (140) is inserted into the limiting groove (122), and the sealing ring (140) and the limiting groove (122) are interference-fitted.

4. The battery pack according to claim 1, wherein: The sealing ring (140) is further provided with a plurality of second holes (142), all of which are circumferentially arranged around the first hole (141). The housing (120) is further provided with connecting portions (123), the number of the connecting portions (123) being the same as the number of the second holes (142), and each of the connecting portions (123) is plugged into one of the second holes (142). The locking member (700) passes through the sealing ring (140) and is fixed to the housing (120).

5. The battery pack according to claim 4, characterized in that: The housing (120) is a cuboid, the assembly surface is rectangular, four connecting portions (123) are provided, and the four connecting portions (123) are distributed at the four corners of the assembly surface.

6. The battery pack according to claim 4, characterized in that: The locking member (700) includes a locking bolt; the connecting portion (123) is recessed with a blind hole (121), an embedded nut (130) is embedded in the blind hole (121), and the locking bolt extends into the blind hole (121) and is threadedly engaged with the embedded nut (130).

7. The battery pack according to claim 6, characterized in that: The connecting row (110) is insert-molded in the housing (120); and / or The embedded nut (130) is insert-molded in the housing (120).

8. The battery pack according to claim 1, wherein: The battery pack further comprises a battery assembly and an immersion liquid (600), wherein the box shell (500) is filled with the immersion liquid (600), the battery assembly is installed in the box shell (500), two plug connectors (100) are provided, and the two plug connectors (100) are respectively connected to the two ends of the battery assembly, and the plug connectors (100) are installed in the box shell (500) and partially extend out of the box shell (500).

9. The battery pack according to claim 8, characterized in that: The box shell (500) is further provided with two mounting holes (520) and a plurality of positioning holes (510), each of the locking members (700) passes through one of the positioning holes (510), and each of the plug connectors (100) is connected to one of the mounting holes (520); the shell (120) further includes a sleeve (124), the sleeve (124) extending in a direction perpendicular to the assembly surface, the inner wall of the sleeve (124) matching and fitting with the surface of the connecting row (110), and the outer wall of the sleeve (124) fitting with the hole wall of the mounting hole (520).

10. The battery pack according to claim 8, wherein: A reinforcing plate (200) is provided at each end of the battery assembly. The thickness of the reinforcing plate (200) is greater than the thickness of the connecting bar (110). The reinforcing plate (200) and the connecting bar (110) are fixed by pressure riveting.

11. The battery pack according to claim 10, characterized in that: The battery assembly comprises a plurality of busbars (300) and a plurality of battery cells (400), all of the battery cells (400) are sequentially connected in series, two adjacent battery cells (400) are connected via one busbar (300), and the battery cells (400) located at the edge are connected to the reinforcing plate (200) via one busbar (300).

12. The battery pack according to any one of claims 1 to 11, characterized in that: The housing (120) is integrally injection-molded.

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