Immersed battery pack

Abstract

The utility model provides an immersed battery pack. The immersed battery pack comprises a battery cell module, a shell, a first connecting piece and a second connecting piece, the battery cell module is provided with an output row; the shell comprises an inner wall surface and an outer wall surface opposite to the inner wall surface, and a through hole penetrating through the inner wall surface and the outer wall surface is formed in the shell; the first connecting piece is connected with the output row, and part of the first connecting piece can extend into the through hole from one side of the inner wall surface; the second connecting piece is positioned on one side of the outer wall surface; the second connecting piece is electrically connected with the first connecting piece in the through hole, or the first connecting piece penetrates through the through hole to be electrically connected with the second connecting piece. The first connecting piece and the external second connecting piece are electrically connected in the through hole or at the periphery of the shell, and the joint of the first connecting piece and the external second connecting piece is not immersed in the cooling liquid any more, so that the risk of back-twist is overcome, the reliability of electric connection is improved, and the contact internal resistance is kept constant without influencing the overcurrent capacity.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, and more particularly to an immersion battery pack. BACKGROUND

[0002] For the immersion battery pack, a cooling liquid is filled in a shell, and a battery cell module is immersed in the cooling liquid, so that the cooling liquid fully cools the battery cell module. High-voltage output of the immersion battery pack mainly relies on a copper bar and a connector. The copper bar is arranged in the shell and connected with output terminals of the battery cell module, and the connector is fixed on the shell in a manner of being mounted from outside of the shell, and part of the connector extends into the shell and is connected with the copper bar through a bolt, so that the connector serves as a high-voltage output port of the immersion battery pack.

[0003] However, in the conventional immersion battery pack, the connector and the copper bar are connected at a position immersed in the cooling liquid. During vibration of the immersion battery pack, the bolt is prone to untwisting under the action of the cooling liquid, which not only reduces the reliability of the electrical connection, but also causes the cooling liquid to seep between the copper bar and the connector, thereby increasing the contact resistance and affecting the overcurrent capacity. CONTENT OF THE UTILITY MODEL

[0004] Embodiments of the present application provide an immersion battery pack to solve the technical problems of reduced electrical connection reliability and increased contact resistance and affected overcurrent capacity caused by bolt untwisting in the related art.

[0005] Embodiments of the present application provide an immersion battery pack, comprising:

[0006] a battery cell module having output terminals;

[0007] a shell including an inner wall surface and an outer wall surface opposite to the inner wall surface, the shell being provided with a through hole penetrating through the inner wall surface and the outer wall surface;

[0008] a first connecting member electrically connected with the output terminals, part of the first connecting member being capable of extending into the through hole from one side of the inner wall surface; and

[0009] a second connecting member located at one side of the outer wall surface, the second connecting member being electrically connected with the first connecting member in the through hole, or the first connecting member being electrically connected with the second connecting member through the through hole.

[0010] In one of the embodiments, the first connecting member is surface-welded with the output terminals, or the first connecting member is integrally formed with the output terminals in an integral structure.

[0011] In one of the embodiments, the shell comprises a box body and a box cover, the box cover is connected with the box body in a predetermined direction and cooperatively defines the accommodation space; the through hole is formed in the box cover and extends along the predetermined direction.

[0012] In one of the embodiments, the immersion battery pack comprises a first nut, the first connecting member and the second connecting member are fastened by the first nut.

[0013] In one of the embodiments, the part of the first connecting member extending into the through hole is provided with an accommodation groove, the first nut is embedded in the accommodation groove and electrically connected with the first connecting member.

[0014] In one of the embodiments, the opening end surface of the accommodation groove is higher than the upper end surface of the first nut, or the opening end surface of the accommodation groove is flush with the upper end surface of the first nut; and / or, an insulation protective layer is arranged between the outer peripheral surface of the part of the first connecting member extending into the through hole and the inner peripheral surface of the through hole.

[0015] In one of the embodiments, the second connecting member comprises an output body and a first connecting bolt, the first connecting bolt is threadedly connected with the first nut to press the output body against the first connecting member.

[0016] In one of the embodiments, the inner wall surface has a sealing surface surrounding the through hole; the immersion battery pack comprises a sealing ring, the sealing ring is clamped between the sealing surface and the first connecting member.

[0017] In one of the embodiments, the inner wall surface is provided with a first limiting flange and a second limiting flange, the first limiting flange extends annularly along the inner ring of the sealing surface, the second limiting flange extends annularly along the outer ring of the sealing surface, the first limiting flange and the second limiting flange cooperatively define a limiting groove matching the shape of the sealing ring.

[0018] In one of the embodiments, the battery cell module comprises a support, the support comprises a body and a connecting column protruding from the body, the output row is arranged on the body, the connecting column penetrates the output row; the immersion battery pack comprises a second connecting bolt, the second connecting bolt penetrates the shell and the sealing ring at the sealing surface and is fixedly connected with the connecting column.

[0019] In one of the embodiments, the connecting column clamps the sealing ring together with the sealing surface at a position spaced apart from the first connecting member.

[0020] In one of the embodiments, the first support surface of the first connecting member clamping the sealing ring is arranged in the same plane as the second support surface of the connecting column clamping the sealing ring.

[0021] In one of the embodiments, the connecting column comprises a column body and a second nut, the column body is integrally connected with the body, the second nut is embedded in the column body, and the second connecting bolt is threadedly connected with the second nut; and / or the immersion battery pack comprises an insulation ring, the insulation ring is arranged on the output row away from the body and is sleeved on the periphery of the connecting column.

[0022] In one of the embodiments, the through hole, the first connecting member and the second connecting member are multiple, the multiple first connecting members correspondingly extend into the multiple through holes, and the multiple second connecting members are electrically connected with the multiple first connecting members one by one.

[0023] The immersion battery pack provided by the embodiments has the beneficial effects that the first connecting member is arranged and electrically connected with the output row, the first connecting member can extend into the through hole of the shell and be electrically connected with the second connecting member outside the shell, and the output row, the first connecting member and the second connecting member outside the shell are sequentially electrically connected to realize charging or discharging. Further, the first connecting member and the second connecting member outside the shell are electrically connected in the through hole or on the periphery of the shell, so that the connection between the two is not immersed in the cooling liquid, which not only overcomes the risk of connection separation caused by bolt untwisting in the conventional scheme, improves the electrical connection reliability of the two, but also overcomes the problem that the cooling liquid seeps into the connection between the two when the bolt is untwisted in the conventional scheme, which increases the contact resistance and affects the overcurrent capacity, and ensures that the contact resistance between the first connecting member and the second connecting member remains constant without affecting the overcurrent capacity. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0025] Figure 1 The structure schematic diagram of the immersion battery pack provided by the embodiments of the present application is shown in the figure.

[0026] Figure 2 The structure schematic diagram of the immersion battery pack provided by the embodiments of the present application is shown in the figure. Figure 1 The structure schematic diagram of the immersion battery pack provided by the embodiments of the present application is shown in the figure.

[0027] Figure 3Figure 1 is a schematic view of a partial cross-sectional view of an immersed battery pack as shown in Figure 1;

[0028] Figure 4 Figure 1 is a schematic view of a partial cross-sectional view of an immersed battery pack as shown in Figure 1; Figure 3 Figure 1 is a schematic view of a partial cross-sectional view of an immersed battery pack as shown in Figure 1;

[0029] Figure 5 Figure 1 is a schematic view of a partial cross-sectional view of an immersed battery pack as shown in Figure 1; Figure 3 Figure 1 is a schematic view of a partial cross-sectional view of an immersed battery pack as shown in Figure 1;

[0030] Figure 6 Figure 1 is a schematic view of a partial cross-sectional view of an immersed battery pack as shown in Figure 1; Figure 5 Figure 1 is a schematic view of a partial cross-sectional view of an immersed battery pack as shown in Figure 1;

[0031] Figure 7 Figure 1 is a schematic view of a partial cross-sectional view of an immersed battery pack as shown in Figure 1; Figure 6 Figure 1 is a schematic view of a partial cross-sectional view of an immersed battery pack as shown in Figure 1;

[0032] In the drawings, each of the following reference signs represents the following meaning:

[0033] 10, immersed battery pack; 20, battery cell module; 21, output row; 22, support; 221, body; 222, connecting column; 223, second support surface; 224, column body; 224a, embedding groove; 225, second nut; 225a, embedded part; 225b, shoulder; 225c, threaded hole; 30, shell; 31, inner wall surface; 311, sealing surface; 32, outer wall surface; 33, accommodation space; 34, through hole; 35, box body; 36, box cover; 371, first limiting flange; 372, second limiting flange; 373, limiting groove; 38, through hole; 40, first connecting piece; 41, connecting surface; 42, accommodation groove; 421, open end surface; 43, first support surface; 44, first connecting part; 45, second connecting part; 50, first nut; 51, insertion groove; 52, upper end surface; 60, insulating protective layer; 70, sealing ring; 80, second connecting bolt; 90, insulating ring; 91, second connecting piece; 92, output body; 93, first connecting bolt. DETAILED DESCRIPTION

[0034] In order to make the technical problems, technical solutions and beneficial effects of the present application clearer, the present application will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present application and not to limit the present application.

[0035] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0036] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate directions or positions based on the directions or positions shown in the drawings, and are used only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0037] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0038] Please refer to Figures 1 to 7 , now the immersion battery pack 10 provided by the embodiment of the present application will be described. The immersion battery pack 10 includes a cell module 20, a shell 30, a first connecting piece 40 and a second connecting piece 91. Among them, the cell module 20 has an output row 21, the shell 30 includes an inner wall surface 31 and an outer wall surface 32 opposite to the inner wall surface 31, and the shell 30 is provided with a through hole 34 penetrating the inner wall surface 31 and the outer wall surface 32. The first connecting piece 40 is electrically connected with the output row 21, and part of the first connecting piece 40 can extend into the through hole 34 from the side of the inner wall surface 31. The second connecting piece 91 is located on the side of the outer wall surface 31, and is electrically connected with the first connecting piece 40 in the through hole 34, or the first connecting piece 40 is electrically connected with the second connecting piece 91 through the through hole 34.

[0039] It can be understood that the cell module 20 includes a plurality of cells (not shown), and the plurality of cells are electrically connected together and finally electrically connected with the output row 21. In the present application, the output row 21 is specifically an aluminum row. It can be understood that the cell module 20 is accommodated in the accommodation space 33 surrounded by the inner wall surface 31.

[0040] For the first connecting piece 40 and the second connecting piece 91, among them, the first connecting piece 40 is built-in in the shell 30, and the second connecting piece 91 is built-out in the shell 30, after part of the first connecting piece 40 extends into the through hole 34 from the side of the inner wall surface 31 of the shell 30, if the part of the first connecting piece 40 does not protrude from the outer wall surface 32, the second connecting piece 91 extends into the through hole 34 to be electrically connected with the first connecting piece 40 in the through hole 34; if the part of the first connecting piece 40 protrudes from the outer wall surface 32 by penetrating the entire through hole 34, the first connecting piece 40 can be electrically connected with the second connecting piece 91 at the periphery of the shell 30.

[0041] For the second connecting piece 91, the end away from the first connecting piece 40 can be electrically connected with the external charging pile, so that the charging pile can charge the submerged battery pack 10. Alternatively, the end of the second connecting piece 91 away from the first connecting piece 40 can be connected with a high-voltage connector, so as to realize high-voltage output. In this way, through the sequential electrical connection of the output row, the first connecting piece 40 and the second connecting piece 91, the submerged battery pack 10 can be charged or discharged.

[0042] In the above-mentioned submerged battery pack 10, by providing the first connecting piece 40 and connecting the first connecting piece 40 with the output row 21 to realize electrical conduction, at the same time, the first connecting piece 40 can also extend into the through hole 34 provided in the shell 30 and be electrically connected with the second connecting piece 91 located outside the shell 30, so that the output row 21, the first connecting piece 40 and the external second connecting piece 91 are sequentially electrically connected to realize charging or discharging. Further, since the first connecting piece 40 and the external second connecting piece 91 are electrically connected in the through hole 34 or on the periphery of the shell 30, the connection between the two will not be submerged in the cooling liquid, not only overcoming the risk of connection separation caused by bolt untwisting in the conventional scheme, but also improving the electrical connection reliability of the two, and also overcoming the problem that when the bolt is untwisted in the conventional scheme, the cooling liquid seeps into the connection between the two, causing the contact resistance to increase and affecting the overcurrent capacity. The contact resistance between the first connecting piece 40 and the second connecting piece 91 is maintained constant without affecting the overcurrent capacity.

[0043] Specifically in the present application, the first connecting piece 40 protrudes out of the outer wall surface 32 through the entire through hole 34, so that the first connecting piece 40 can be electrically connected with the second connecting piece 91 on the periphery of the shell 30. In this way, the second connecting piece 91 and the first connecting piece 40 are more conducive to stable electrical connection together.

[0044] Specifically in the present application, the first connecting piece 40 is face-welded with the output row 21. It can be understood that the first connecting piece 40 has a connecting surface 41, which can be face-to-face attached with the surface of the output row 21 and stably connected together by welding. In this way, the first connecting piece 40 and the output row 21 can be stably connected in a larger area range, completely without the need to use bolts, screws or other auxiliary elements, avoiding the risk of reduced connection reliability and reduced overcurrent capacity caused by bolt untwisting, thereby improving the electrical connection reliability and reducing the contact resistance to improve the overcurrent capacity.

[0045] Further, in the present application, the connecting surface 41 and the surface of the output row 21 are both planar, and in other embodiments, both can also be curved, as long as they can be face-to-face attached together to realize stable connection.

[0046] In another embodiment, the first connecting piece 40 is integrally formed with the output row 21 as an integral structure, so that the first connecting piece 40 and the output row 21 do not need to be connected by using bolts, screws or other auxiliary elements, avoiding the risk of reduced connection reliability and reduced overcurrent capacity caused by bolt loosening, thereby improving the electrical connection reliability and reducing the contact resistance and improving the overcurrent capacity.

[0047] In the present application, the shell 30 includes a box body 35 and a box cover 36, the box cover 36 is connected with the box body 35 in a predetermined direction and cooperatively defines a containing space 33. The through hole 34 is formed in the box cover 36 and extends in the predetermined direction. It can be understood that by forming the through hole 34 in the box cover 36, the first connecting piece 40 connected with the output row 21 can extend into the through hole 34 during the connection of the box cover 36 and the box body 35. Since the side where the box cover 36 is located in the submerged battery pack 10 is often defined as the top, and the side away from the box cover 36 is the bottom, the submerged battery pack 10 of the present application can realize charging or high-voltage external output from the top. It should be pointed out that, as shown in the figure, the direction of the Z axis is the predetermined direction. Figure 1

[0048] Since the shell 30 is divided into the box body 35 and the box cover 36, in the conventional charging and discharging mode, the connector is only suitable for being installed on the side surface of the box body 35 and cannot be fixed on the box cover 36 to output through the top (if the connector is fixed on the box cover 36, the connector cannot be connected with the copper row), so that in the shell 30, a space for connecting the copper row, the connector and the output row 21 on one side of the battery cell module 20 needs to be reserved in advance, and the space also needs to be filled with cooling liquid, which will inevitably increase the use amount of the cooling liquid and increase the cost and weight of the battery pack. In the present application, the top charging and discharging mode can avoid reserving space on one side of the battery cell module 20, thereby reducing the use amount of the cooling liquid and reducing the cost and weight of the battery pack.

[0049] In addition, after the battery cell module 20 is placed in the containing space 33, the signal acquisition assembly, the bracket 22 and the connecting row are often arranged in the top space of the containing space 33 close to the box cover 36, and the output row 21 is often installed on the bracket 22 and electrically connected with the connecting row. In the present application, the top charging and discharging mode can arrange the connection between the first connecting piece 40 and the output row 21, the sealing structure at the through hole 34 of the box cover 36, etc. in the top space, so that the top space can be fully utilized, thereby further reducing the use amount of the cooling liquid in the top space, reducing the cost and weight of the battery pack, and the output row 21 does not need to extend from the top space to the side surface, so that a shorter output row 21 can meet the requirements, thereby further reducing the cost.

[0050] In combination with​Figures 1 to 5 As shown, specifically in the present application, the submerged battery pack 10 comprises a first nut 50, the first connecting piece 40 and the second connecting piece 91 are locked through the first nut 50. By setting the first nut 50, the second connecting piece 91 can be quickly and electrically connected with the first connecting piece 40.

[0051] Further, the part of the first connecting piece 40 extending into the through hole 34 is provided with a receiving groove 42, and the first nut 50 is embedded in the receiving groove 42 and electrically connected with the first connecting piece 40. It can be understood that by embedding the first nut 50 in the receiving groove 42 of the first connecting piece 40, not only the stable electrical connection between the first nut 50 and the first connecting piece 40 can be achieved, but also the second connecting piece 91 can be quickly and electrically connected with the first nut 50.

[0052] In addition, it can be understood that if the first connecting piece 40 is directly electrically connected with the second connecting piece 91, the first connecting piece 40 needs to be replaced in the case of wear on the mating surface of the two connections. Thus, it will result in high maintenance cost. By setting the first nut 50 and connecting it with the second connecting piece 91, only the first nut 50 needs to be replaced when the connection reliability of the first nut 50 and the second connecting piece 91 is reduced, which can greatly reduce the maintenance cost compared with replacing the first connecting piece 40.

[0053] Further, the receiving groove 42 is in the shape of a polygonal prism, and the outer peripheral surface of the first nut 50 is also in the shape of a polygonal prism identical to that of the receiving groove 42, so that the first nut 50 cannot move relative to the receiving groove 42 in the circumferential direction after being embedded in the receiving groove 42, thereby ensuring the connection stability of the first nut 50 and the first connecting piece 40. Further, the first nut 50 is provided with a slot 51, and the second connecting piece 91 can extend into the slot 51, thereby being electrically connected with the first nut 50 in a plug-in manner.

[0054] Specifically in the present application, the opening end face 421 of the receiving groove 42 is flush with the upper end face 52 of the first nut 50. In other embodiments, the opening end face 421 of the receiving groove 42 is higher than the upper end face 52 of the first nut 50. Thus, the upper end face 52 of the first nut 50 does not protrude from the opening end face 421 of the receiving groove 42, so that when the second connecting piece 91 is connected with the first nut 50, it can also be in contact with the opening end face 421 of the receiving groove 42, thereby ensuring the reliability of the electrical connection. Further, the first connecting piece 40 extends into the through hole 34 and protrudes from the outer wall surface 32, and the opening end face 421 of the receiving groove 42 protrudes from the outer wall surface 32, which can further facilitate the contact with the second connecting piece 91 and ensure the reliability of the electrical connection.

[0055] In combination Figure 2 With Figure 3As shown, in particular in the present application, the second connecting member 91 comprises an output body 92 and a first connecting bolt 93, the first connecting bolt 93 is threadedly engaged with the first nut 50 to press the output body 92 against the first connecting member 40. It can be understood that after the output body 92 is pressed against the first connecting member 40, the surface of the output body 92 can be tightly attached to the opening end face 421 of the accommodating groove 42 of the first connecting member 40, so that the reliability of the electrical connection can be improved. For the first connecting bolt 93, it can be threadedly engaged with the first nut 50 after penetrating through the output body 92, so that the output body 92 and the first connecting member 40 are stably electrically connected, or the first connecting bolt 93 can be integrally connected with the output body 92, and after the first connecting bolt 93 is threadedly engaged with the first nut 50, the output body 92 and the first connecting member 40 are stably electrically connected.

[0056] In particular in the present application, an insulating protective layer 60 is arranged between the outer circumferential surface of the part of the first connecting member 40 extending into the through hole 34 and the inner circumferential surface surrounding the through hole 34. It can be understood that the insulating protective layer 60 plays an insulating protective role between the first connecting member 40 and the shell 30, avoiding the shell 30 from being electrified. For the insulating protective layer 60, it is in a cylindrical shape and is sleeved on the outer circumferential surface of the first connecting member 40, so as to completely cover the part of the first connecting member 40 extending into the through hole 34.

[0057] In combination with Figures 1 to 7 As shown, in the embodiment of the present application, the inner wall surface 31 has a sealing surface 311 surrounding the through hole 34, and the immersion type battery pack 10 comprises a sealing ring 70 clamped between the sealing surface 311 and the first connecting member 40. By arranging the sealing surface 311 around the through hole 34 and clamping the sealing ring 70 by the first connecting member 40 and the sealing surface 311 together, sealing can be achieved at the through hole 34, so as to avoid the cooling liquid in the accommodating space 33 from overflowing through the through hole 34.

[0058] Further, the inner wall surface 31 is provided with a first limiting flange 371 and a second limiting flange 372, the first limiting flange 371 extends in a ring shape along the inner circle of the sealing surface 311, and the second limiting flange 372 extends in a ring shape along the outer circle of the sealing surface 311, the first limiting flange 371 and the second limiting flange 372 together define a limiting groove 373 matching the shape of the sealing ring 70 (as shown in the figure). Figure 7It can be understood that the sealing ring 70 can be just installed in the space defined by the first limiting flange 371 and the second limiting flange 372, so that the first limiting flange 371 and the second limiting flange 372 jointly play a predetermined role in sealing, and the groove bottom of the limiting groove 373 is the sealing surface 311 abutting against the sealing ring 70. It can be understood that for the first limiting flange 371, it can be a plurality of protrusions arranged at intervals along the inner circle of the sealing surface 311, or it can be a ring body formed by connecting a plurality of protrusions together. Similarly, for the second limiting flange 372, it can be a plurality of protrusions arranged at intervals along the outer circle of the sealing surface 311, or it can be a ring body formed by connecting a plurality of protrusions together.

[0059] In combination Figures 1 to 6 As shown in FIG. 1, in the embodiment of the present application, the battery cell module 20 includes a bracket 22, the bracket 22 includes a body 221 and a connecting column 222 protruding from the body 221, the output row 21 is arranged on the body 221, the connecting column 222 penetrates the output row 21, the immersion battery pack 10 includes a second connecting bolt 80, the second connecting bolt 80 penetrates the shell 30 and the sealing ring 70 at the sealing surface 311 and is fixedly connected with the connecting column 222. By arranging the connecting column 222 on the bracket 22, the second connecting bolt 80 can be fixedly connected with the connecting column 222 in an external manner after penetrating the shell 30, so as to fix the relative position of the shell 30 and the bracket 22, thereby ensuring that each device mounted on the bracket 22 will not move in the accommodation space 33. Further, the through hole 38 of the shell 30 for the second connecting bolt 80 to penetrate corresponds to the sealing surface 311, so that the sealing ring 70 can seal the second connecting bolt 80 and the shell 30 at the through hole 38, avoiding the cooling liquid in the accommodation space 33 from overflowing through the through hole 38.

[0060] It should be noted that the output row 21 is arranged on the body 221, and the output row 21 needs to be holed to avoid the connecting column 222, so that the body 221 and the first connecting piece 40 are respectively located on opposite sides of the output row 21. In the process of connecting the second connecting bolt 80 and the connecting column 222, the connecting column 222 can drive the body 221, the output row 21 and the first connecting piece 40 to move towards the sealing surface 311, so that the first connecting piece 40 presses the sealing ring 70 against the sealing surface 311. In this way, the sealing can be realized by pressing the sealing ring 70 against the sealing surface 311 by the first connecting piece 40 while realizing the charging and discharging by the first connecting piece 40.

[0061] In the present application, the second connecting bolts 80 are multiple, and the multiple second connecting bolts 80 are uniformly distributed on the same circumference with the center of the through hole 34 as the center. By uniformly arranging multiple second connecting bolts 80 around the through hole 34, the uniform stress of the sealing surface 311 around the through hole 34 can be realized to improve the sealing performance, and the problem of local sealing performance reduction due to uneven stress and deformation can be avoided. Specifically, the second connecting bolts 80 are two, the number of the through holes 38 opened on the shell 30 is also two, and the two second connecting bolts 80 are correspondingly arranged in the two through holes 38. In other embodiments, the number of the second connecting bolts 80 can also be three, four, five, or other numbers.

[0062] In combination Figures 1 to 6 As shown, specifically in the embodiment of the present application, the connecting column 222 clamps the sealing ring 70 together with the sealing surface 311 at a position spaced from the first connecting piece 40. Defining the first support surface 43 on the first connecting piece 40 clamping the sealing ring 70, and the second support surface 223 on the connecting column 222 clamping the sealing ring 70, part of the sealing surface 311 clamps part of the sealing ring 70 around the through hole 34 in cooperation with the first support surface 43, and part of the sealing surface 311 clamps part of the sealing ring 70 around the second connecting bolt 80 in cooperation with the second support surface 223. In this way, in the case of only one sealing ring 70, the sealing of the through hole 34 and the through hole 38 can be realized, the sealing difficulty is reduced, and the sealing reliability is improved.

[0063] Specifically in the present application, the first support surface 43 and the second support surface 223 are coplanar, which can provide relatively stable support and clamping for the sealing ring 70. In other embodiments, the first support surface 43 and the second support surface 223 can also be parallel but not coplanar, at this time, the sealing ring 70 needs to be arranged in a stepped shape to be able to adapt to both the first support surface 43 and the second support surface 223.

[0064] In the present application, for the first connecting piece 40, it is an integral structure including the first connecting part 44 and the second connecting part 45, the first connecting part 44 is columnar and extends into the through hole 34, the second connecting part 45 is connected to one end of the first connecting part 44 and extends to the outer periphery of the first connecting part 44 to protrude from the outer peripheral surface of the first connecting part 44, so that the first connecting piece 40 as a whole is in the shape of “T”, the side of the second connecting part 45 protruding from the first connecting part 44 and facing the sealing surface 311 is the first support surface 43, and the side of the second connecting part 45 away from the first connecting part 44 is the connecting surface 41, and the output row 21 is connected to the connecting surface 41. Thus, the second connecting part 45 of the first connecting piece 40 provides an annular first support surface 43 capable of clamping the sealing ring 70 in cooperation with the sealing surface 311.

[0065] In combinationFigures 4 to 6 As shown, in particular in the present application, the connecting post 222 comprises a post body 224 and a second nut 225, the post body 224 is integrally connected with the body 221, and the second nut 225 is embedded in the post body 224, and the second connecting bolt 80 is threadedly connected with the second nut 225. It can be understood that by dividing the connecting post 222 into two parts embedded with each other, in the case of wear on the connecting surface of the second connecting bolt 80 and the second nut 225, only the second nut 225 needs to be replaced, thereby reducing the maintenance cost. In addition, the post body 224 and the body 221 can be integrally formed into a plastic part by injection molding or suction molding, and the second nut 225 can be embedded in the embedding groove 224a formed on the post body 224 by hot pressing.

[0066] Further, the second nut 225 comprises an embedded part 225a and a shoulder part 225b, the embedded part 225a can be embedded in the embedding groove 224a on the post body 224, and the shoulder part 225b is connected with the embedded part 225a and is pressed on the end face of the post body 224, thereby the side of the shoulder part 225b away from the post body 224 provides a second supporting surface 223 capable of clamping and sealing the sealing ring 70 in cooperation with the sealing surface 311.

[0067] Further, the second nut 225 is provided with a threaded hole 225c penetrating from the shoulder part 225b to the embedded part 225a, and the second connecting bolt 80 can be threadedly connected with the second nut 225 in the threaded hole 225c. Further, the second connecting bolt 80 and the second nut 225 are both metal parts, which can improve the connection reliability.

[0068] In particular in the present application, the submerged battery pack 10 comprises an insulating ring 90, which is arranged on the output row 21 away from the body 221 and is sleeved on the periphery of the connecting post 222. The arrangement of the insulating ring 90 can increase the electrical safety distance.

[0069] In particular, for the second nut 225, after the embedded part 225a is embedded in the post body 224, it can be insulated and cannot conduct electricity between the post body 224 made of plastic material and the output row 21, and the shoulder part 225b is provided with a larger thickness because it needs to support the sealing ring 70 and bear more connection with the second connecting bolt 80. By arranging the insulating ring 90, the electrical safety distance between the shoulder part 225b and the output row 21 can be increased.

[0070] In the present application, the through hole 34, the first connecting part 40 and the second connecting part 91 are both two, the two first connecting parts 40 are respectively inserted into the two through holes 34, the two second connecting parts 91 are respectively electrically connected with the two first connecting parts 40, and the two second connecting parts 91 can be respectively used as the positive electrode and the negative electrode of the submerged battery pack 10.

[0071] In other embodiments, the number of the through holes 34, the first connecting pieces 40 and the second connecting pieces 91 can also be other numbers, as long as the number of the three is equal. For example, when a plurality of battery cell modules 20 are arranged in the shell 30, the required number of through holes 34, first connecting pieces 40 and second connecting pieces 91 can be arranged.

[0072] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A submersible battery pack, characterized in that, include: The battery cell module has an output port; The outer casing includes an inner wall surface and an outer wall surface opposite to the inner wall surface, and the outer casing has a through hole penetrating the inner wall surface and the outer wall surface; A first connector is electrically connected to the output outlet; a portion of the first connector can extend into the through hole from one side of the inner wall surface. and The second connector is located on one side of the outer wall surface; the second connector is electrically connected to the first connector within the through hole, or the first connector passes through the through hole and is electrically connected to the second connector.

2. The immersion battery pack according to claim 1, characterized in that, The first connector is welded to the output row surface, or the first connector and the output row are integrally formed into a single structure.

3. The immersion battery pack according to claim 1, characterized in that, The outer shell includes a box body and a box cover. The box cover is connected to the box body in a predetermined direction and together they form an accommodating space. The through hole is opened in the box cover and extends in the predetermined direction.

4. The immersion battery pack according to claim 1, characterized in that, The submersible battery pack includes a first nut, and the first connector and the second connector are fastened together by the first nut.

5. The immersion battery pack according to claim 4, characterized in that, The portion of the first connector that extends into the through hole has a receiving groove, and the first nut is embedded in the receiving groove and electrically connected to the first connector.

6. The immersion battery pack according to claim 5, characterized in that, The opening end face of the receiving groove is higher than the upper end face of the first nut, or the opening end face of the receiving groove is flush with the upper end face of the first nut; and / or, an insulating protective layer is provided between the outer peripheral surface of the portion of the first connector extending into the through hole and the inner peripheral surface surrounding the through hole.

7. The immersion battery pack according to claim 5, characterized in that, The second connector includes an output body and a first connecting bolt, wherein the first connecting bolt is threadedly engaged with the first nut to press the output body against the first connector.

8. The immersion battery pack according to claim 1, characterized in that, The inner wall surface has a sealing surface surrounding the through hole; the submersible battery pack includes a sealing ring that is clamped between the sealing surface and the first connector.

9. The immersion battery pack according to claim 8, characterized in that, The inner wall surface is provided with a first limiting flange and a second limiting flange. The first limiting flange extends in an annular shape along the inner ring of the sealing surface, and the second limiting flange extends in an annular shape along the outer ring of the sealing surface. The first limiting flange and the second limiting flange together define a limiting groove that matches the shape of the sealing ring.

10. The immersion battery pack according to claim 8, characterized in that, The battery cell module includes a bracket, which includes a body and a connecting post protruding from the body. The output row is placed on the body, and the connecting post passes through the output row. The submersible battery pack includes a second connecting bolt, which passes through the outer shell and the sealing ring at the sealing surface and is fixedly connected to the connecting post.

11. The immersion battery pack according to claim 10, characterized in that, The connecting post, at a position spaced apart from the first connecting member, clamps the sealing ring together with the sealing surface.

12. The immersion battery pack according to claim 11, characterized in that, The first support surface on the first connector that clamps the sealing ring is coplanar with the second support surface on the connecting post that clamps the sealing ring.

13. The immersion battery pack according to claim 10, characterized in that, The connecting post includes a post body and a second nut. The post body is integrally connected to the main body, the second nut is embedded in the post body, and the second connecting bolt is threadedly connected to the second nut; and / or, the submersible battery pack includes an insulating ring, which is placed on the output row on the side opposite to the main body and is sleeved around the connecting post.

14. The immersion battery pack according to any one of claims 1 to 13, characterized in that, There are multiple through holes, the first connector and the second connector. The multiple first connectors extend into the multiple through holes in a one-to-one correspondence. The multiple second connectors are electrically connected to the multiple first connectors in a one-to-one correspondence.

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