Immersed battery pack

Abstract

The invention 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, the battery cell module is accommodated in an accommodating space defined by 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 field of battery technology, and more specifically, to an immersion battery pack. Background Art

[0002] For the immersed battery pack, the coolant is filled inside the shell, and the battery module is immersed in the coolant, so that the coolant can fully cool the battery module. The high-voltage output of the immersed battery pack mainly relies on the copper busbar and the connector. The copper busbar is placed inside the shell and electrically connected to the output busbar of the battery module, and the connector is fixed to the shell by installing it from the outside of the shell, and part of the connector extends into the shell and is connected to the copper busbar by bolts, so that the connector serves as the high-voltage output port of the immersed battery pack.

[0003] However, in conventional immersed battery packs, the connection between the connector and the copper busbar is also immersed in the coolant. During the vibration of the immersed battery pack, the bolts are easily twisted back under the action of the coolant, which not only reduces the reliability of the electrical connection, but also causes the coolant to penetrate between the copper busbar and the connector, resulting in an increase in the contact internal resistance and affecting the current carrying capacity. Summary of the invention

[0004] The purpose of the embodiments of the present application is to provide an immersed battery pack to solve the technical problems existing in the related art, such as reduced electrical connection reliability and increased contact internal resistance resulting from bolt back-twisting, which affects the current carrying capacity.

[0005] The present application provides an immersed battery pack, comprising:

[0006] A battery cell module having an output row;

[0007] The shell comprises an inner wall surface and an outer wall surface opposite to the inner wall surface, the battery cell module is accommodated in the accommodation space surrounded by the inner wall surface, and the shell is provided with a through hole penetrating the inner wall surface and the outer wall surface;

[0008] A first connecting member electrically connected to the output row; a portion of the first connecting member can extend into the through hole from one side of the inner wall surface; and

[0009] The second connecting member is located at one side of the outer wall surface; the second connecting member is electrically connected to the first connecting member in the through hole, or the first connecting member passes through the through hole to be electrically connected to the second connecting member.

[0010] In one embodiment, the first connecting member and the output row are welded surface to surface, or the first connecting member and the output row are integrally formed to form an integrated structure.

[0011] In one embodiment, the housing includes a box body and a box cover, the box cover is connected to the box body in a predetermined direction and together they enclose the accommodating space; the through hole is formed in the box cover and extends along the predetermined direction.

[0012] In one of the embodiments, the submerged battery pack includes a first nut, and the first connecting member and the second connecting member are locked by the first nut.

[0013] In one of the embodiments, a portion of the first connecting member extending into the through hole is provided with a receiving groove, and the first nut is embedded in the receiving groove and electrically connected to the first connecting member.

[0014] In one embodiment, the opening end surface of the accommodating groove is higher than the upper end surface of the first nut, or the opening end surface of the accommodating groove is flush with the upper end surface of the first nut; and / or an insulating protective layer is provided between the outer circumferential surface of the portion of the first connecting member extending into the through hole and the inner circumferential surface surrounding the through hole.

[0015] In one embodiment, the second connecting member includes an output body and a first connecting bolt, and the first connecting bolt is threadably matched 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 immersed battery pack includes a sealing ring, and the sealing ring is clamped between the sealing surface and the first connecting member.

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

[0018] In one of the embodiments, the battery cell module includes a bracket, the bracket includes a main body and a connecting column protruding from the main body, the output row is placed on the main body, and the connecting column passes through the output row; the immersed battery pack includes a second connecting bolt, the second connecting bolt passes through the outer shell and the sealing ring at the sealing surface, and is fixedly connected to the connecting column.

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

[0020] In one of the embodiments, a first supporting surface on the first connecting member that clamps the sealing ring is coplanar with a second supporting surface on the connecting column that clamps the sealing ring.

[0021] In one embodiment, the connecting column includes a column body and a second nut, the column body is integrally connected to the main body, the second nut is embedded in the column body, and the second connecting bolt is threadedly connected to the second nut; and / or, the immersion battery pack includes an insulating ring, which is placed on a side of the output row away from the main body and is sleeved on the periphery of the connecting column.

[0022] In one embodiment, the through holes, the first connecting members and the second connecting members are all multiple, the multiple first connecting members extend into the multiple through holes one by one, and the multiple second connecting members are electrically connected to the multiple first connecting members one by one.

[0023] The beneficial effect of the immersion battery pack provided by the embodiment of the present application is that electrical conduction is achieved by providing a first connector and connecting the first connector to the output row, and at the same time, the first connector can also extend into the through hole provided by the shell and electrically connect to the second connector located outside the shell, so that the output row, the first connector and the external second connector are electrically connected in sequence to achieve charging or discharging. Furthermore, since the first connector and the external second connector are electrically connected in the through hole or on the periphery of the shell, the connection between the two will no longer be immersed in the coolant, which not only overcomes the risk of connection separation caused by bolt back-twisting in the conventional solution, so that the reliability of the electrical connection between the two is improved, but also can overcome the problem of coolant seeping into the connection between the two when the bolt is back-twisted in the conventional solution, resulting in an increase in contact internal resistance and affecting the flow capacity, ensuring that the contact internal resistance between the first connector and the second connector remains constant without affecting the flow capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0025] Figure 1 A schematic diagram of the structure of an immersion battery pack provided in an embodiment of the present application;

[0026] Figure 2 for Figure 1 An enlarged schematic diagram of the structure at A in the submerged battery pack shown;

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

[0028] Figure 4 for Figure 3 Schematic diagram of the exploded structure of the submerged battery pack shown;

[0029] Figure 5 for Figure 3 A partial cross-sectional view of the submerged battery pack;

[0030] Figure 6 for Figure 5 A schematic diagram of the structure enlarged at B in the middle;

[0031] Figure 7 for Figure 6 A schematic diagram of the inner side structure of the middle box cover;

[0032] Among them, the reference numerals in the figure are:

[0033] 10. Immersed battery pack; 20. Cell module; 21. Output row; 22. Bracket; 221. Body; 222. Connecting column; 223. Second supporting surface; 224. Column; 224a. Embedding groove; 225. Second nut; 225a. Embedding portion; 225b. Shoulder; 225c. Threaded hole; 30. Shell; 31. Inner wall surface; 311. Sealing surface; 32. Outer wall surface; 33. Accommodating space; 34. Through hole; 35. Box body; 36. Box cover; 371. First limit Positioning flange; 372, second limiting flange; 373, limiting groove; 38, perforation; 40, first connecting member; 41, connecting surface; 42, accommodating groove; 421, opening end surface; 43, first supporting surface; 44, first connecting part; 45, second connecting part; 50, first nut; 51, slot; 52, upper end surface; 60, insulating protective layer; 70, sealing ring; 80, second connecting bolt; 90, insulating ring; 91, second connecting member; 92, output body; 93, first connecting bolt. DETAILED DESCRIPTION

[0034] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used 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", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0037] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0038] Please also read Figures 1 to 7 , the immersed battery pack 10 provided in the embodiment of the present application is now described. The immersed battery pack 10 includes a battery cell module 20, a shell 30, a first connector 40 and a second connector 91. Among them, the battery 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, the battery cell module 20 is accommodated in a accommodating space 33 surrounded by the inner wall surface 31, and the shell 30 is provided with a through hole 34 that penetrates the inner wall surface 31 and the outer wall surface 32. The first connector 40 is electrically connected to the output row 21, and part of the first connector 40 can extend into the through hole 34 from one side of the inner wall surface 31. The second connector 91 is located on one side of the outer wall surface 31, and it is electrically connected to the first connector 40 in the through hole 34, or the first connector 40 is electrically connected to the second connector 91 through the through hole 34.

[0039] It can be understood that the battery cell module 20 includes a plurality of battery cells (not shown), the plurality of battery cells are electrically connected together, and finally electrically connected to the output bar 21. In the present application, the output bar 21 is specifically an aluminum bar.

[0040] Regarding the first connecting member 40 and the second connecting member 91, wherein the first connecting member 40 is built into the outer shell 30, and the second connecting member 91 is placed outside the outer shell 30, after part of the first connecting member 40 extends into the through hole 34 from one side of the inner wall surface 31 of the outer shell 30, if the part of the first connecting member 40 does not protrude from the outer wall surface 32, the second connecting member 91 extends into the through hole 34 to be electrically connected to the first connecting member 40 in the through hole 34; if the part of the first connecting member 40 passes through the entire through hole 34 and protrudes from the outer wall surface 32, the first connecting member 40 can be electrically connected to the second connecting member 91 at the periphery of the outer shell 30.

[0041] For the second connector 91, one end thereof away from the first connector 40 can be electrically connected to an external charging pile, so that the charging pile can charge the immersion battery pack 10. Alternatively, one end of the second connector 91 away from the first connector 40 can be connected to a high-voltage connector to achieve high-voltage output. In this way, the immersion battery pack 10 can be charged or discharged by sequentially electrically connecting the output row 21, the first connector 40 and the second connector 91.

[0042] In the above-mentioned immersion battery pack 10, electrical conduction is achieved by providing the first connector 40 and connecting the first connector 40 to the output row 21. At the same time, the first connector 40 can also extend into the through hole 34 opened in the shell 30 and electrically connect to the second connector 91 located outside the shell 30, so that the output row 21, the first connector 40 and the external second connector 91 are electrically connected in sequence to achieve charging or discharging. Furthermore, since the first connector 40 and the external second connector 91 are electrically connected in the through hole 34 or on the periphery of the shell 30, the connection between the two will no longer be immersed in the coolant, which not only overcomes the risk of connection separation caused by bolt back-twisting in the conventional solution, so that the reliability of the electrical connection between the two is improved, but also overcomes the problem that the coolant seeps into the connection between the two when the bolt is back-twisted in the conventional solution, resulting in an increase in the contact internal resistance and affecting the flow capacity, ensuring that the contact internal resistance between the first connector 40 and the second connector 91 remains constant without affecting the flow capacity.

[0043] Specifically in the present application, the first connector 40 passes through the entire through hole 34 and protrudes from the outer wall surface 32, so that the first connector 40 can be electrically connected to the second connector 91 at the periphery of the housing 30. Such a configuration is more conducive to the stable electrical connection between the second connector 91 and the first connector 40.

[0044] Specifically in the present application, the first connector 40 is welded to the output row 21. It can be understood that the first connector 40 has a connecting surface 41, and the connecting surface 41 can be face-to-face fitted with the surface of the output row 21, and stably connected together by welding, so that the first connector 40 and the output row 21 can be stably connected over a large area, without the need to use other auxiliary components such as bolts and screws, avoiding the risk of reduced connection reliability and reduced flow capacity caused by bolt back-twisting, thereby improving electrical connection reliability, and reducing contact internal resistance to improve flow capacity.

[0045] Furthermore, in the present application, the connection surface 41 and the surface of the output row 21 are both planar. In other embodiments, both may also be curved surfaces, and it is only necessary to ensure that the two can fit together face to face to achieve a stable connection.

[0046] In another embodiment, the first connecting member 40 and the output row 21 are integrally formed to form an integrated structure. In this way, there is no need to use other auxiliary components such as bolts and screws to connect the first connecting member 40 and the output row 21, thereby avoiding the risk of reduced connection reliability and reduced current capacity due to bolt back-twisting, thereby improving the electrical connection reliability and reducing the contact internal resistance to improve the current capacity.

[0047] In the present application, the housing 30 includes a box body 35 and a box cover 36, and the box cover 36 is connected to the box body 35 in a predetermined direction, and together they enclose a storage space 33. A through hole 34 is provided on the box cover 36, and extends in a predetermined direction. It can be understood that by providing the through hole 34 on the box cover 36, during the process of the box cover 36 being connected to the box body 35, the first connecting member 40 connected to the output row 21 can extend into the through hole 34. Since the side of the submerged battery pack 10 where the box cover 36 is located 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 be charged or output high voltage from the top. It should be pointed out that if Figure 1 As shown, the direction of the Z axis is the predetermined direction.

[0048] Since the outer shell 30 is divided into two parts, the box body 35 and the box cover 36, in the conventional charging and discharging method, the connector is only suitable for installation on the side 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 to the copper busbar). In this way, inside the outer shell 30, on one side of the battery module 20, it is necessary to reserve space in advance for the connection of the copper busbar, the connector and the output bus 21, and the space also needs to be filled with coolant, which will inevitably increase the amount of coolant used, increasing the cost and weight of the battery pack. In this application, the top charging and discharging method is adopted, so there is no need to reserve additional space on one side of the battery module 20, thereby reducing the amount of coolant used, reducing the cost and weight of the battery pack.

[0049] In addition, after the battery cell module 20 is placed in the accommodation space 33, its signal acquisition components, brackets 22, connecting rows and other structural parts are often arranged in the top space near the box cover 36 in the accommodation space 33, and the output row 21 is also often installed on the bracket 22 and electrically connected to the connecting row. In the present application, the top charging and discharging method is adopted, so that the connection between the first connector 40 and the output row 21, the sealing structure at the through hole 34 on the box cover 36, etc. can be arranged in the top space, so that the top space can be fully utilized, thereby further reducing the use of coolant 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, so that only a shorter length of the output row 21 is needed to meet the demand, thereby further reducing the cost.

[0050] Combination Figures 1 to 5 As shown, specifically in the present application, the submerged battery pack 10 includes a first nut 50, and the first connector 40 and the second connector 91 are locked by the first nut 50. By providing the first nut 50, the second connector 91 can be quickly and easily electrically connected to the first connector 40.

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

[0052] In addition, it can be understood that if the first connecting member 40 is directly electrically connected to the second connecting member 91, then when the mating surfaces of the two connecting members are worn, the first connecting member 40 needs to be replaced, which will result in high maintenance costs. However, by providing the first nut 50 and connecting it to the second connecting member 91, after the connection reliability between the first nut 50 and the second connecting member 91 is reduced, only the first nut 50 needs to be replaced during maintenance, which can greatly reduce the maintenance cost compared to replacing the first connecting member 40.

[0053] Furthermore, the receiving groove 42 is in the shape of a polygonal column, and the outer peripheral surface of the first nut 50 is also in the shape of a polygonal column of the same shape as the receiving groove 42, so that after the first nut 50 is embedded in the receiving groove 42, it cannot move relative to the receiving groove 42 in the circumferential direction, thereby ensuring the connection stability between the first nut 50 and the first connecting member 40. Furthermore, a slot 51 is provided on the first nut 50, and the second connecting member 91 can be inserted into the slot 51, so as to be electrically connected to the first nut 50 by plugging and unplugging.

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

[0055] Combination Figure 2 and Figure 3As shown, specifically in the present application, the second connecting member 91 includes an output body 92 and a first connecting bolt 93, and the first connecting bolt 93 is threadedly matched 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 presses the first connecting member 40, the surface of the output body 92 can be closely attached to the open end surface 421 of the receiving groove 42 on 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 matched with the first nut 50 after passing through the output body 92, so that the output body 92 and the first connecting member 40 can achieve a stable electrical connection, or the first connecting bolt 93 can be connected to the output body 92 as an integral structure, and after the first connecting bolt 93 and the first nut 50 are threadedly matched, the output body 92 and the first connecting member 40 can achieve a stable electrical connection.

[0056] Specifically, in the present application, an insulating protective layer 60 is provided between the outer circumference of the portion of the first connector 40 extending into the through hole 34 and the inner circumference surrounding the through hole 34. It can be understood that the insulating protective layer 60 plays an insulating protective role between the first connector 40 and the housing 30 to prevent the housing 30 from being charged. The insulating protective layer 60 is cylindrical and is sleeved on the outer circumference of the first connector 40, so as to completely cover the portion of the first connector 40 extending into the through hole 34.

[0057] Combination 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 immersed battery pack 10 includes a sealing ring 70, which is clamped between the sealing surface 311 and the first connector 40. By providing the sealing surface 311 around the through hole 34 and using the first connector 40 and the sealing surface 311 to clamp the sealing ring 70 together, sealing can be achieved at the through hole 34, thereby preventing the coolant in the accommodating space 33 from overflowing through the through hole 34.

[0058] Furthermore, 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 along the inner circle of the sealing surface 311 in an annular shape, and the second limiting flange 372 extends along the outer circle of the sealing surface 311 in an annular shape. The first limiting flange 371 and the second limiting flange 372 jointly define a limiting groove 373 (such as a groove 373) that matches the shape of the sealing ring 70. Figure 7As shown in ). It can be understood that the sealing ring 70 can be installed exactly 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 can jointly play a role in pre-positioning the seal, and the bottom of the limiting groove 373 is the sealing surface 311 that is close to 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] Combination Figures 1 to 6 As shown, in the embodiment of the present application, the battery 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 placed on the body 221, the connecting column 222 penetrates the output row 21, and the immersion battery pack 10 includes a second connecting bolt 80, the second connecting bolt 80 penetrates the outer shell 30 and the sealing ring 70 at the sealing surface 311, and is fixedly connected to the connecting column 222. By providing the connecting column 222 to the bracket 22, the second connecting bolt 80 can be fixedly connected to the connecting column 222 after penetrating the outer shell 30 in an external manner, thereby fixing the relative position of the outer shell 30 and the bracket 22, thereby ensuring that the components installed on the bracket 22 will not move in the accommodating space 33. Furthermore, the through hole 38 on the housing 30 for the second connecting bolt 80 to pass through corresponds to the sealing surface 311 , so that the sealing ring 70 can seal the second connecting bolt 80 and the housing 30 at the through hole 38 to prevent the coolant in the accommodating space 33 from overflowing through the through hole 38 .

[0060] It should be pointed out that the output row 21 is placed on the main body 221, and a hole needs to be opened in the output row 21 to avoid the connecting column 222, so that the main body 221 and the first connecting member 40 are respectively located on opposite sides of the output row 21. During the connection between the second connecting bolt 80 and the connecting column 222, the connecting column 222 can drive the main body 221, the output row 21 and the first connecting member 40 to approach the sealing surface 311, so that the first connecting member 40 presses the sealing ring 70 against the sealing surface 311. In this way, the first connecting member 40 can be used to press the sealing ring 70 to achieve sealing while realizing charging and discharging through the first connecting member 40.

[0061] In the present application, there are multiple second connecting bolts 80, and the multiple second connecting bolts 80 are evenly distributed on the same circumference with the center of the through hole 34 as the center. By evenly arranging multiple second connecting bolts 80 around the through hole 34, it is possible to achieve uniform force on the sealing surface 311 around the through hole 34 to improve the sealing performance, and avoid the problem of local sealing performance reduction caused by deformation due to uneven force. Specifically, there are two second connecting bolts 80, and the number of through holes 38 opened on the housing 30 is also two, and the two second connecting bolts 80 are correspondingly penetrated 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] Combination Figures 1 to 6 As shown, specifically in the embodiment of the present application, the connection column 222 and the sealing surface 311 clamp the sealing ring 70 together at a position spaced apart from the first connection member 40. The first support surface 43 is defined as the first connection member 40 that clamps the sealing ring 70, and the second support surface 223 is defined as the connection column 222 that clamps the sealing ring 70. Then, the partial sealing surface 311 cooperates with the first support surface 43 to clamp the partial sealing ring 70 around the through hole 34, and the partial sealing surface 311 cooperates with the second support surface 223 to clamp the partial sealing ring 70 around the second connection bolt 80. In this way, when only one sealing ring 70 is required, sealing around the through hole 34 and the through hole 38 can be achieved, thereby reducing the difficulty of sealing and improving the reliability of sealing.

[0063] Specifically in the present application, the first support surface 43 and the second support surface 223 are arranged in the same plane, which can achieve relatively stable support and clamping of the sealing ring 70. In other embodiments, the first support surface 43 and the second support surface 223 can also be arranged in parallel but not in the same plane. In this case, the sealing ring 70 needs to be arranged in a stepped shape so as to be able to fit with both the first support surface 43 and the second support surface 223 at the same time.

[0064] In the present application, the first connecting member 40 is an integrally formed structure and includes a first connecting portion 44 and a second connecting portion 45. The first connecting portion 44 is columnar and extends into the through hole 34. The second connecting portion 45 is connected to one end of the first connecting portion 44 and extends toward the outer periphery of the first connecting portion 44 and protrudes from the outer peripheral surface of the first connecting portion 44, so that the first connecting member 40 is in a "T" shape as a whole. The side of the second connecting portion 45 that protrudes from the first connecting portion 44 and faces the sealing surface 311 is the first supporting surface 43, and the side of the second connecting portion 45 that faces away from the first connecting portion 44 is the connecting surface 41, and the output row 21 is connected to the connecting surface 41, so that the second connecting portion 45 on the first connecting member 40 provides an annular first supporting surface 43 that can cooperate with the sealing surface 311 to clamp the sealing ring 70.

[0065] Combination Figures 4 to 6 As shown, specifically in the present application, the connecting column 222 includes a column 224 and a second nut 225, the column 224 is integrally connected with the body 221, the second nut 225 is embedded in the column 224, and the second connecting bolt 80 is threadedly connected with the second nut 225. It can be understood that by dividing the connecting column 222 into two parts that are embedded in each other, when the connecting mating surface between the second connecting bolt 80 and the second nut 225 is worn, only the second nut 225 needs to be replaced, thereby reducing the maintenance cost. In addition, the column 224 and the body 221 can be formed in one go by injection molding or vacuum molding to obtain a plastic part connected in one body, and the second nut 225 can be embedded in the embedding groove 224a provided on the column 224 by hot pressing.

[0066] Furthermore, the second nut 225 includes an embedding portion 225a and a shoulder portion 225b. The embedding portion 225a can be embedded in the embedding groove 224a on the column 224, and the shoulder portion 225b is connected to the embedding portion 225a and pressed against the end face of the column 224, so that the side of the shoulder portion 225b facing away from the column 224 provides a second supporting surface 223 that can cooperate with the sealing surface 311 to clamp the sealing ring 70.

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

[0068] Specifically in the present application, the immersed battery pack 10 includes an insulating ring 90, which is placed on the side of the output row 21 away from the main body 221 and is sleeved on the periphery of the connecting column 222. The setting of the insulating ring 90 can increase the electrical safety distance.

[0069] Specifically, for the second nut 225, after the embedded portion 225a is embedded in the column 224, it can be insulated from the output row 21 by the action of the plastic column 224 and cannot conduct electricity, while the shoulder 225b is set to be thicker because it needs to support the sealing ring 70 and bear more functions of connecting with the second connecting bolt 80. By providing the insulating ring 90, the electrical safety distance between the shoulder 225b and the output row 21 can be increased.

[0070] In the present application, there are two through holes 34, two first connecting members 40 and two second connecting members 91, the two first connecting members 40 extend into the two through holes 34 one by one, the two second connecting members 91 are electrically connected to the two first connecting members 40 one by one, and the two second connecting members 91 can be used as the positive and negative electrodes of the immersion battery pack 10 respectively.

[0071] In other embodiments, the number of through holes 34, first connectors 40 and second connectors 91 can be other, as long as the number of the three is equal. For example, when multiple battery modules 20 are arranged in the housing 30, the required number of through holes 34, first connectors 40 and second connectors 91 can be arranged.

[0072] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. An immersion battery pack, characterized in that: include: A battery cell module having an output row; The shell comprises an inner wall surface and an outer wall surface opposite to the inner wall surface, the battery cell module is accommodated in the accommodation space surrounded by the inner wall surface, and the shell is provided with a through hole penetrating the inner wall surface and the outer wall surface; A first connecting member electrically connected to the output row; a portion of the first connecting member can extend into the through hole from one side of the inner wall surface; and The second connecting member is located at one side of the outer wall surface; the second connecting member is electrically connected to the first connecting member in the through hole, or the first connecting member passes through the through hole to be electrically connected to the second connecting member.

2. The submerged battery pack according to claim 1, characterized in that: The first connecting member and the output row are welded surface to surface, or the first connecting member and the output row are integrally formed to form an integrated structure.

3. The submerged battery pack according to claim 1, characterized in that: The shell comprises a box body and a box cover, wherein the box cover is matched and connected with the box body along a predetermined direction and together encloses the accommodation space; the through hole is arranged in the box cover and extends along the predetermined direction.

4. The submerged battery pack according to claim 1, characterized in that: The submerged battery pack includes a first nut, and the first connecting member and the second connecting member are locked by the first nut.

5. The submerged battery pack according to claim 4, characterized in that: A receiving groove is formed in the portion of the first connecting member extending into the through hole, and the first nut is embedded in the receiving groove and electrically connected to the first connecting member.

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

7. The submerged battery pack according to claim 5, characterized in that: The second connecting member includes an output body and a first connecting bolt, and the first connecting bolt is threadably matched with the first nut to press the output body against the first connecting member.

8. The submerged battery pack according to claim 1, characterized in that: The inner wall surface has a sealing surface surrounding the through hole; the immersed battery pack includes a sealing ring, and the sealing ring is clamped between the sealing surface and the first connecting member.

9. The submerged 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 a ring shape along the inner circle of the sealing surface, the second limiting flange extends in a ring shape along the outer circle of the sealing surface, and the first limiting flange and the second limiting flange jointly define a limiting groove matching the shape of the sealing ring.

10. The submerged battery pack according to claim 8, characterized in that: The battery cell module includes a bracket, which includes a main body and a connecting column protruding from the main body, the output row is placed on the main body, and the connecting column passes through the output row; the immersed 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 column.

11. The submerged battery pack according to claim 10, characterized in that: The connecting column and the sealing surface clamp the sealing ring together at a position spaced apart from the first connecting member.

12. The submerged battery pack according to claim 11, characterized in that: The first supporting surface on the first connecting member that clamps the sealing ring is coplanarly arranged with the second supporting surface on the connecting column that clamps the sealing ring.

13. The submerged battery pack according to claim 10, characterized in that: The connecting column includes a column body and a second nut, the column body is integrally connected to the main body, the second nut is embedded in the column body, and the second connecting bolt is threadedly connected to the second nut; and / or, the immersion battery pack includes an insulating ring, which is placed on a side of the output row away from the main body and is sleeved on the periphery of the connecting column.

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

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