Conductive sheet, power battery module and power battery box

Abstract

The present invention discloses a conductive sheet, a power battery module and a power battery box. The conductive sheet comprises a substrate; the substrate is provided with a plurality of through holes, and the substrate is provided with a strip-shaped flange located in the through holes for electrical connection; the substrate is provided with a conductive sleeve; the conductive sleeve is used to form an electrical connection with a conductive core. The strip-shaped flange of the conductive sheet provided by the present invention can provide a reliable electrical connection for the battery cell in the power battery, and the conductive sleeve of the conductive sheet can also form a reliable electrical connection with the conductive core.

Description

[0001] This application is a divisional application of a Chinese patent application with an application date of November 16, 2016, application number 201611032443.4, and invention name “Power battery module and power battery box having a power battery module”. Technical Field

[0002] The present invention relates to the field of power batteries, and in particular to a conductive sheet, a power battery module and a power battery box. Background Art

[0003] As people's environmental awareness grows, electric vehicles are becoming more and more popular as a means of transportation. With the growth of electric vehicles, the traditional solution of using lead-acid batteries is no longer applicable. Not only can the safety, installation consistency and disassembly convenience of power battery packs not be guaranteed, but the subsequent recycling and treatment will cause serious pollution and be inconvenient to organize production and subsequent maintenance.

[0004] The power battery pack usually includes a plurality of battery cells. During the driving process of the electric vehicle, the power battery pack needs to withstand relatively severe bumps, which can easily cause the electrical connection failure of the components in the power battery pack and the electrical connection of the power battery pack is unreliable. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome the defect of unreliable electrical connection in the existing power battery pack and provide a conductive sheet, a power battery module and a power battery box.

[0006] The present invention provides a conductive sheet, comprising a substrate; the substrate is provided with a plurality of through holes, the substrate is formed with strip-shaped flanges located in the through holes for electrical connection; the substrate is provided with a conductive sleeve; the conductive sleeve is used to form an electrical connection with a conductive core.

[0007] Preferably, the substrate is formed by combining a copper bar and a nickel sheet, and the strip flange is formed by extending the nickel sheet.

[0008] Preferably, the end of the strip-shaped flange is provided with a raised convex point.

[0009] Preferably, the strip-shaped flange is provided with a long hole extending along the length direction of the strip-shaped flange, and each end of the strip-shaped flange is provided with two protrusions which are respectively located on both sides of the long hole.

[0010] Preferably, the elongated hole has a straight section, and the strip-shaped flange forms two parallel straight arms.

[0011] Preferably, the protrusion is arranged to be located at the center of the through hole, and the protrusion height of the protrusion is 0.2-0.4 mm and the diameter thereof is 1-1.5 mm.

[0012] Preferably, an arc groove is formed at the connection between the strip-shaped flange and the base.

[0013] Preferably, the conductive sleeve and the conductive core form a power battery connection structure; one or more elastic conductive parts are provided in the conductive sleeve; the conductive core comprises a core tube and a conductive core body in the core tube; the core body and the conductive sleeve are detachably sleeved, and the core body is in contact with the elastic conductive part when sleeved.

[0014] Preferably, when the core body is sleeved with the conductive sleeve, the elastic conductive member is clamped by the outer wall of the core body and the inner wall of the conductive sleeve.

[0015] Preferably, the inner wall of the conductive sleeve is provided with one or more conductive annular grooves, the elastic conductive member is arranged in the conductive annular grooves, and the elastic conductive member is interference fit with the conductive annular grooves.

[0016] Preferably, the elastic conductive member is an annular conductive spring.

[0017] Preferably, the conductive sleeve comprises a sleeve, the sleeve comprises a sleeve, and inner walls at both ends of the sleeve are respectively provided with one or more elastic conductive members.

[0018] Preferably, the inner wall of the conductive sleeve is provided with at least one first sealing ring groove, the first sealing ring groove is provided between the elastic conductive part and the opening of the conductive sleeve core body, and a first sealing ring is provided in the first sealing ring groove.

[0019] Preferably, an annular limiting ring is further provided on the outer wall at the middle position of the sleeve.

[0020] Preferably, the core body includes a first core body and second core bodies at both ends thereof, the diameter of the second core body is smaller than that of the first core body, the diameter of the first core body is adapted to the inner diameter of the core tube, and the second core body is connected to the sleeve of the conductive sleeve.

[0021] Preferably, the core barrel comprises a barrel body, and at least one second sealing ring is respectively disposed on the inner walls at both ends of the barrel body and on the outer wall of the second core body.

[0022] Preferably, a second sealing ring groove is provided on the inner wall of the cylinder at the junction of the first core body and the second core body, both ends of the second sealing ring groove have protrusions on the inner wall of the cylinder, and the second sealing ring is confined in the second sealing ring groove.

[0023] The present invention further provides a power battery module, comprising a battery cell. The power battery module further comprises the conductive sheet as described above, wherein the conductive sheet is used to electrically connect the battery cell.

[0024] The present invention further provides a power battery box, wherein the battery module is placed in the box, and is characterized in that a plurality of battery modules as described above that are fixedly arranged side by side constitute the battery module.

[0025] Preferably, the conductive sleeve is electrically connected to a conductive sleeve on another battery module through a conductive core to achieve electrical conduction between the plurality of battery modules.

[0026] On the basis of being in accordance with the common sense in the art, the above-mentioned preferred conditions can be arbitrarily combined to obtain the preferred embodiments of the present invention.

[0027] The positive and progressive effects of the present invention are:

[0028] The strip-shaped flange of the conductive sheet provided by the present invention can provide a reliable electrical connection for the battery cell in the power battery, and the conductive sleeve of the conductive sheet can also form a reliable electrical connection with the conductive core. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic structural diagram of an embodiment of a power battery box of the present invention.

[0030] Figure 2 yes Figure 1 Schematic diagram of the internal structure of the power battery box shown.

[0031] Figure 3 It is a schematic structural diagram of an embodiment of a module box of the present invention.

[0032] Figure 4 yes Figure 3 Schematic diagram of the inverted structure of the module box shown.

[0033] Figure 5 It is a schematic structural diagram of an embodiment of a copper-nickel conductive sheet of the present invention.

[0034] Figure 6 yes Figure 5 A partial enlarged schematic diagram of area A in the middle.

[0035] Figure 7 It is a schematic structural diagram of an embodiment of a copper-nickel conductive sheet with a conductive sleeve of the present invention.

[0036] Figure 8 It is a schematic structural diagram of an embodiment of a copper-nickel conductive sheet with a female plug of the present invention.

[0037] Fig. 9 It is a schematic diagram of the three-dimensional structure of an embodiment of the conductive sleeve of the present invention.

[0038] Fig.10 yes Fig. 9 A schematic diagram of the three-dimensional structure of the conductive sleeve is shown.

[0039] Fig.11 yes Fig. 9 A plan view of the conductive sleeve shown.

[0040] Fig.12 yes Fig.11 The conductive sleeve is shown in a cross-sectional view along line AA.

[0041] Fig.13 yes Fig.10 A schematic structural diagram of the sleeve of the conductive sleeve shown.

[0042] Fig.14 yes Fig.13 The sleeve is shown in a cross-sectional view along line BB.

[0043] Fig.15 It is a schematic diagram of the three-dimensional structure of an embodiment of the conductive core of the present invention.

[0044] Fig.16 yes Fig.15 Schematic diagram of the three-dimensional structure of the conductive core shown.

[0045] Fig.17 yes Fig.15 Schematic plan view of the conductive core shown.

[0046] Fig.18 yes Fig.17 A cross-sectional view of the conductive core along line AA is shown.

[0047] Fig.19 yes Fig.16 A schematic plan view of the core barrel of the conductive core shown.

[0048] Fig. 20 yes Fig.19 The cross-sectional view of the core barrel along line BB is shown.

[0049] Fig.21 It is a three-dimensional structural schematic diagram of an embodiment of the connection structure of the power battery module of the present invention.

[0050] Fig. 22 yes Fig.21 A schematic diagram of the three-dimensional structural decomposition of the connection structure of the power battery module shown.

[0051] Fig.23 yes Fig.21 A plan view schematically showing the connection structure of the power battery module shown.

[0052] Fig.24 yes Fig.23 The connection structure of the power battery module is shown in a cross-sectional view along line AA. DETAILED DESCRIPTION

[0053] The embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other at will.

[0054] The embodiment of the present invention takes a vehicle-mounted power battery box as an example, including a box body and a battery module located in the box body, the battery module including a plurality of stacked module boxes, the module box containing a plurality of battery cells (i.e., battery cells) and at least one conductive battery cell (i.e., a power battery module connection structure, which is used to be electrically connected to an adjacent power battery module). The module box includes an upper cover and a lower cover, and the outer sides of the upper cover and the lower cover are respectively snap-connected with a conductive sheet and an insulating plate. There are two grooves on each side of the left and right sides of the module box, which are used to snap into the card strip when grouping, and the grooves are correspondingly provided with convex rods that cooperate with the card strip. There are also two grooves on the top edge of the module box, which are used to snap into the card strip when grouping, and a signal acquisition board is fixed on the card strip. The copper-nickel conductive sheet is pre-fixed with a tower spring, which is folded into the top edge groove. After the signal acquisition board is snapped into the groove with the card strip, it contacts the tower spring to achieve electrical connection.

[0055] like Figure 1 and 2 As shown, a power battery box according to an embodiment of the present invention generally includes: a box body 1 , a battery module and a clamping strip 3 .

[0056] A plurality of power battery modules 2 fixedly arranged side by side constitute a battery module. The power battery module 2 is equipped with a plurality of battery cells. The battery modules are arranged side by side in the box 1. The clamping strip 3 clamps and fixes the power battery module 2 into one. The power battery module 2 is an integral structure including at least a module box, battery cells, conductive battery cells, conductive sheets, and insulating sheets.

[0057] like Figure 3 and Figure 4 As shown, a module box of a power battery module 2 of the present invention comprises: an upper cover 21 and a lower cover 22; the upper cover 21 is formed with one or more upper slots 211 for mounting battery cells 106; the lower cover 22 is formed with a lower slot 221 for mounting battery cells corresponding to the upper slot 211; the upper cover 21 and the lower cover 22 are snapped together. One or more conductive battery cells can be mounted in the slot.

[0058] A protruding buckle 231 is formed on the upper cover 21, a latch tongue 232 is formed on the lower cover 22, and a latch groove 233 matching the buckle 231 is formed on the latch tongue 232. The upper cover 21 and the lower cover 22 are clamped together by the buckle 231 and the latch groove 233 on the latch tongue 232. The positions of the buckle and the latch tongue can be interchanged; the clamping method is not limited to the buckle, the latch tongue and the latch groove of this embodiment; the upper and lower covers can also be fixed in a detachable manner other than clamping.

[0059] The outer side of the upper cover 21 (i.e., the upper surface of the upper cover) is provided with an upper conductive sheet 241 connected to the electrode on one side of the battery cell 106, and the outer side of the lower cover 22 (i.e., the lower surface of the lower cover) is provided with a lower conductive sheet 242 connected to the electrode on the other side of the battery cell 106. The outer side of the upper conductive sheet 241 (i.e., the upper surface of the upper conductive sheet) is covered with an upper insulating sheet 251, and the outer side of the lower conductive sheet 242 (i.e., the lower surface of the lower conductive sheet) is covered with a lower insulating sheet 252. Among them, the conductive sheet is used to realize the series and parallel connection between multiple battery cells, and the insulating sheet is used to prevent the conductive sheets from contacting each other after multiple modules are stacked, so it is set to a size that can at least completely cover the conductive sheet. In the figure, since the conductive sheet is covered by the insulating sheet, only its edge is shown.

[0060] In this embodiment, the conductive sheet is limited on the upper cover and the lower cover by multiple snap fasteners on the edges of the outer sides of the upper cover and the lower cover, and is welded and fixedly connected to the positive or negative pole of the battery cell in the module box. The insulating sheet is also limited on the upper cover and the lower cover by multiple snap fasteners on the edges of the outer sides of the upper cover and the lower cover.

[0061] In order to realize the series connection of each module in the battery module, the conductive sheet and the insulating sheet are also provided with a plurality of corresponding through holes (six in this embodiment, such as Figure 3 , 4 As shown), the conductive battery cell can be configured into the shape of a battery cell, disposed in the upper slot body and the lower slot body, and electrically connected to the conductive battery cell in the adjacent module through a conductive member, thereby realizing a path between modules.

[0062] The lower cover 22 is provided with pillars 26 for supporting the upper cover 21, which evenly support the upper cover 21. The pillars are hollow, and the space where they are located can also help prevent overheating of the battery area. There can be multiple pillars, including but not limited to pillars that only support the upper cover, pillars with engaging parts at the top and engaging with the corresponding parts of the upper cover for detachable fixing, etc.

[0063] A plurality of grooves 27 are formed on the surrounding sides of the upper cover 21 and the lower cover 22, including positioning grooves for aligning and positioning multiple power battery modules 2 up and down when the multiple power battery modules 2 are stacked, and clamping strip grooves for clamping and fixing the multiple power battery modules 2 after they are stacked, wherein a protruding rod 271 is formed in the clamping strip groove so as to be clamped and connected with the clamping strip having a clamping hole.

[0064] Figure 5-8 An embodiment of the conductive sheet of the present invention is shown.

[0065] like Figure 5 As shown, the conductive sheet includes a substrate 41, which is formed by welding a copper bar and a nickel sheet, for example, by laser welding. The substrate 41 is provided with a plurality of through holes 42 (such as Figure 6As shown), the through holes 42 correspond one-to-one to the battery cells (not shown) arranged in the module box.

[0066] Figure 6 yes Figure 5 The partially enlarged schematic diagram of the middle area A shows the structure of a through hole 42. The substrate 41 is formed with a strip flange 43 located in the through hole 42. The strip flange 43 is formed by extending the nickel sheet and preferably extends to the center of the through hole. The strip flange 43 is symmetrically arranged in the through hole 42, and arc grooves are formed at the connection with the substrate 41. The strip flange 43 is used to form an electrical connection with the positive and negative electrodes of the battery cell by welding or other means. The end of each strip flange 43 has two bumps 44 (such as Figure 6 As shown), the four protrusions 44 at the center of the through hole are arranged to protrude toward the positive and negative surfaces of the battery cell, becoming electrical connection points welded to the positive and negative electrodes of the battery cell.

[0067] The strip flange 43 may also be provided with a long hole 45 extending along the length direction of the strip flange 43 to reduce the strength of the strip flange and make it easier for the end protrusions of the strip flange to be pressed tightly against the positive and negative surfaces of the battery cell; at the same time, if a current overload occurs, the strip flange with the long hole is more likely to melt, thereby improving safety; in addition, due to the long hole, the welding current is dispersed over a small area and is more easily concentrated on the four protrusions 44.

[0068] The convex point can be formed by stamping, and the height of the convex point is preferably 0.2-0.4 mm, and the diameter is preferably 1-1.5 mm, so as to facilitate processing and ensure electrical connection after welding. The long strip hole can have a straight section, so that the strip flange forms two parallel straight arms, and both sides of the straight arm are straight lines, so as to ensure that the straight arm is easier to fuse when the current is overloaded.

[0069] In order to adapt to the electrical connection between copper-nickel conductive sheets or the electrical connection with the signal acquisition board, the copper-nickel conductive sheets may include a variety of different forms. For example, some copper busbars are equipped with conductive sleeves, which are connected to the conductive core to complete the conduction between modules; some copper busbars are equipped with conductive columns, and some copper busbars are equipped with conductive column sleeves, both of which are installed in adjacent modules to achieve conduction between modules; some copper busbars are equipped with female plugs, which are connected to the wiring harness heads, and some copper busbars are pre-fixed with tower springs to achieve electrical connection with the signal acquisition board.

[0070] Figure 7 The figure is a schematic structural diagram of an embodiment of a copper-nickel conductive sheet with a conductive sleeve of the present invention, wherein reference numeral 7 represents a tower spring, and reference numeral 5 represents a conductive sleeve.

[0071] The tower spring 7 is mounted on a bending piece 47 extending outward from the base 41 and bending in a direction perpendicular to the base 41. The bending piece 47 is folded into the top groove of the module box and contacts with contact points pre-placed on the signal acquisition board, such as tower springs, conductive discs, etc., to achieve electrical connection between the copper-nickel conductive sheet and the signal acquisition board, and is used for collecting temperature signals, voltage signals, etc. of the power battery.

[0072] The conductive sleeve 5 is installed on the elongated piece 46 extending outward from the base 41, including a conductive sleeve and a conductive spring built into the conductive sleeve, and realizes electrical connection with the conductive sleeve on another module through a conductive core, thereby realizing conduction between modules. The conductive spring can be a ring structure wound by a conductive coil, which is elastic and can maintain electrical connection during bumps. Among them, the conductive core can be set at the position of a certain battery cell in the power battery module 2, one end of which can be set to be connected to the conductive sleeve, and the other end can be set to be connected to a separate conductive sleeve, the other end of the separate conductive sleeve is also connected to the conductive core on another power battery module 2, and the electrical connection between the two modules is realized through the conductive sleeve on another power battery module 2.

[0073] Figure 8 The figure is a schematic structural diagram of an embodiment of a copper-nickel conductive sheet with a female plug according to the present invention, wherein reference numeral 7 represents a tower spring, and reference numeral 9 represents a female plug.

[0074] The relevant structure and function of the tower spring 7 are as described above. The female plug 9 is arranged on the protruding piece of the base 41, and one power battery module 2 has a pair of positive and negative female plugs 9. The female plug 9 is used to insert the wiring harness head to achieve electrical connection between two power battery modules 2, or between the power battery module 2 and the high-voltage module. The wiring harness head (not shown) includes a housing, a plug, a plug seat, a compression spring and a conductive spring, which are inserted into the female plug 9 to achieve electrical connection.

[0075] In another embodiment, a conductive column disposed downward is installed on the bottom conductive sheet of a power battery module 2, and a conductive column sleeve disposed downward is installed on the top conductive sheet of the adjacent power battery module 2 below, and the two are sleeved to achieve electrical conduction between the modules. The conductive column sleeve includes a conductive sleeve and a conductive spring therein.

[0076] Figure 9-14 An embodiment of the conductive sleeve of the present invention is shown. The conductive sleeve is a component of the conductive battery core. The conductive cores of two adjacent power battery modules 2 are respectively connected to a conductive sleeve to achieve electrical connection between the two power battery modules 2.

[0077] like Figure 9-14As shown, the conductive sleeve 5 comprises a sleeve 52, which comprises a tubular sleeve 521, an annular limiting ring 522 is provided in the middle of the outer wall of the sleeve 521, and a conductive ring groove array composed of annular conductive ring grooves 523 and a sealing ring groove array composed of annular first sealing ring grooves 524 are respectively provided at both ends of the inner wall of the sleeve 521, a detachable annular conductive spring 53 is respectively provided in the conductive ring groove 523, and a detachable annular first sealing ring 54 is respectively provided in the first sealing ring groove 524. The conductive spring and the conductive ring groove are preferably interference fit, and the first sealing ring and the first sealing ring groove are preferably interference fit.

[0078] The sleeve 52 is made of copper, the first sealing ring 54 is made of rubber, and the conductive spring 53 is a silver-plated spring.

[0079] When in use, two conductive cores can be sleeved at both ends, and the conductive core includes a core tube and a conductive core body in the core tube. When sleeved, the core body contacts the conductive spring in the conductive sleeve. The limiting ring on the outer wall of the sleeve is used to limit the end edges of the conductive cores sleeved at both ends.

[0080] When using, Fig.14 As shown, a pair of conductive ring grooves 523 and a sealing ring groove 524 are respectively provided at both ends of the inner wall of the sleeve 521. Of course, the number of the conductive ring grooves 523 and the first sealing ring grooves 524 can be increased or decreased as needed. When connecting the battery, due to the elasticity of the conductive spring 53 itself, it is preferably set to a ring structure wound by a conductive coil (the conductive coil is wound along a ring path). The conductive coil forms a ring-shaped hollow channel, so it can be compressed and deformed when subjected to external force, so that even in a bumpy environment, the core body of the conductive core and the conductive spring slide relative to each other, which will not affect the electrical connection between the two, thereby improving the axial and radial follow-up of the two, and will not cause power failure, sparking and other phenomena, and the connection is reliable and practical.

[0081] Figure 15-20 An embodiment of the conductive core of the present invention is shown. The conductive core is a component of the conductive battery. The conductive cores of two adjacent power battery modules 2 are respectively connected to a conductive sleeve to achieve electrical connection between the two power battery modules 2.

[0082] like Figures 15 to 20As shown, the conductive core 6 comprises a core barrel 62 and a core body 63. The core barrel 62 comprises a cylindrical barrel body 621, and the inner wall ends of the barrel body 621 are respectively provided with a sealing ring groove array consisting of an annular second sealing ring groove 622, and a separable second sealing ring 64 is respectively provided in the second sealing ring groove 622, and the core body 63 comprises a cylindrical first core body 631, and the two ends of the first core body 631 are respectively provided with a cylindrical second core body 632, and the diameter of the second core body 632 is smaller than that of the first core body 631, and the diameter of the first core body 631 is adapted to the inner diameter of the barrel body 621, and the diameter of the second core body 632 is adapted to the inner diameter of the second sealing ring 64, wherein the second sealing ring is preferably interference fit with the second sealing ring groove, and preferably interference fit with the second core body.

[0083] The two ends of the cylinder 621 are respectively provided with a trumpet-shaped card interface 623, which facilitates the plugging operation of the core 63 and the conductive sleeve 521. The sealing ring is preferably interference-fitted with the sealing ring groove, and is preferably interference-fitted with the second core.

[0084] The core 63 is made of copper, and the second sealing ring 64 is made of rubber.

[0085] When in use, any end of the conductive core can be sleeved with a conductive sleeve, and the inner wall of the conductive sleeve has a conductive spring. When sleeved, the second core 632 contacts the conductive spring in the conductive sleeve.

[0086] When in use, the conductive core is used as a battery and is placed in the cover box to serve as a conductive path. Fig.18 As shown, the user directly inserts the two second sealing rings 64 into the corresponding sealing ring grooves 622 respectively, and the inner wall of the second sealing ring 64 is in close contact with the outer wall of the second core body 632 of the core body 63, thereby sealing the interior of the core body 63 to prevent erosion by external water vapor, with obvious effects and strong practicality.

[0087] Of course, the number of the sealing ring grooves 622 can be increased or decreased as needed to adapt to different working environments.

[0088] Figure 21-24 An embodiment of the connection structure of the power battery module 2 (ie, the conductive battery cell) of the present invention is shown.

[0089] like Figure 21 to Figure 24 As shown, the connection structure comprises a conductive sleeve 5 and a conductive core 6, and the conductive core 6 is plug-connected to the conductive sleeve 5.

[0090] The following describes how to use this connection structure.

[0091] like Fig.23 and Fig.24As shown, a conductive sleeve 5 is placed between two connected conductive cores 6, and the core body 63 is directly inserted into the corresponding sleeve, so that the second core body 632 of the core body 63 is in close contact with a pair of conductive springs 53, and the first sealing ring 54 and the second sealing ring 64 form a double sealing structure. Among them, the inner and outer diameters of the conductive spring 53 are respectively interference fit with the inner wall of the sleeve 521 and the outer wall of the second core body 632, so that the conductive spring 53 is clamped after assembly; the inner and outer diameters of the first sealing ring 54 are respectively interference fit with the inner wall of the sleeve 521 and the outer wall of the second core body 632, so that the first sealing ring 54 is clamped after assembly; the inner and outer diameters of the second sealing ring 64 are respectively interference fit with the outer wall of the second core body 632 and the inner wall of the cylinder 621, so that the second sealing ring 64 is clamped after assembly. After assembly, the two ends of the limit ring are respectively pressed against the ends of the two core cylinders.

[0092] On the other hand, Fig.18 and Fig. 20 As shown, both ends of the sealing ring groove 622 have protrusions on the inner wall of the cylinder 621, so that the front and rear ends of the sealing ring 64 are limited in the sealing ring groove 622, and the benefits brought include: because the outer end is limited, it abuts against the end edge protrusion formed by the first core body being wider than the second core body, and the core body is axially limited in the core barrel, but has a certain axial buffer displacement; the first core body and the cylinder body are preferably clearance-matched, and the sealing ring can be used to achieve a certain radial buffer displacement of the core body in the core barrel. During the assembly of the conductive sleeve and the conductive core, the sleeve connection can be achieved even if the two are not completely aligned. Of course, the conductive sleeve and the conductive core can preferably be provided with a beveled card interface at the interface where they are sleeved, such as Fig. 20 The card interface 623 in the middle. In other embodiments, the first core body can also be interference fit with the core barrel to limit the position.

[0093] The conductive sleeve, core body and conductive spring of this embodiment are made of conductive materials. Through the conductive springs at both ends of the conductive sleeve, the core bodies of the two conductive cores can be electrically connected. The conductive spring 53 of this embodiment is configured to be elastic, and is preferably configured to be an annular structure wound by a conductive coil (the conductive coil is wound along an annular path). The conductive coil forms an annular hollow channel, so it can be compressed and deformed when subjected to external force, so that even in a bumpy environment, the core body 63 and the conductive spring 53 slide relative to each other, and it will not affect the electrical connection of the two adjacent conductive cores N, thereby improving the axial and radial follow-up of the two, and will not cause power failure, sparking and other phenomena, and the connection is reliable.

[0094] It should be noted that the number of the first sealing ring 54, the second sealing ring 64 and the conductive spring 53 can be increased or decreased as needed. The array described in this embodiment refers to two or more related components arranged in parallel. The overall structure and internal detailed structure of the conductive sleeve and the conductive core are not limited to a circular shape, but can also be a square structure. In this case, the detailed structure such as the conductive spring can be a square ring. The conductive spring 53 is not limited to a ring-shaped spring structure, and other elastic conductive elements can also be used, such as providing a long strip of spring leaves on the inner wall of the sleeve 521, or providing a plurality of groups of elastic conductive balls on the inner wall of the sleeve 521. In short, as long as the conductive element can maintain elastic close contact with the core 63, it can be used.

[0095] The sleeve and the core in this embodiment may be made of copper, the first sealing ring and the second sealing ring may be made of rubber, and the conductive spring may be a silver-plated spring.

[0096] The connection structure of this embodiment can be made into the shape of a battery cell and installed in the slot of the module box, and can be used for the electrical connection between two power battery module 2 boxes composed of battery cells, and can also be used for the electrical connection of other structures in the battery box.

[0097] The electrical connection method of the power battery module 2 of the present invention can be, but is not limited to: the battery tank body in the module box is pre-divided into multiple areas, the positive and negative poles of the battery cells in each area are in the same direction, two conductive sheets are respectively welded to the positive and negative poles of all the battery cells in this area to form a parallel structure of these battery cells, and then the adjacent ones on the same side are connected.

[0098] The two conductive sheets are integrated (such as Figure 5 The conductive sheet (the left half area is connected to the positive electrodes of multiple batteries, and the right half area is connected to the negative electrodes of multiple batteries) or is connected to form a series connection between multiple parallel structures, thereby electrically connecting the battery cells in the entire power battery module 2. The entire power battery module 2 will lead out a positive terminal and a negative terminal, which can be used as the positive terminal or negative terminal through a conductive column, a conductive column sleeve, a conductive sleeve, a female plug, etc. extending from the conductive sheet. If the positive and negative terminals of two adjacent power battery modules 2 are in adjacent positions, they can be connected in series through a pair of conductive columns and a conductive column sleeve; if they are not in adjacent positions (located on the upper and lower sides of the module box respectively), they can be connected in series through the connection structure of the conductive sleeve and the conductive core.

[0099] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A conductive sheet, characterized in that: The conductive sheet comprises a substrate, a plurality of through holes are formed on the substrate, and a strip-shaped flange is formed on the substrate and is located in the through holes for electrical connection; a conductive sleeve is provided on the substrate; the conductive sleeve is used to form an electrical connection with a conductive core, and the conductive core comprises a core tube and a conductive core body in the core tube; the conductive sleeve comprises a sleeve, and the sleeve comprises a sleeve, and one or more elastic conductive parts are respectively provided on the inner walls at both ends of the sleeve; the core body and the conductive sleeve are detachably sleeved; and when sleeved, the core body is in contact with the elastic conductive part.

2. The conductive sheet according to claim 1, wherein: The substrate is formed by combining a copper bar and a nickel sheet, and the strip flange is formed by extending the nickel sheet.

3. The conductive sheet according to claim 1, wherein: The end of the strip-shaped flange is provided with a raised convex point.

4. The conductive sheet according to claim 3, characterized in that: The strip-shaped flange is provided with a long hole extending along the length direction of the strip-shaped flange, and the end of each strip-shaped flange is provided with two convex points which are respectively located at two sides of the long hole.

5. The conductive sheet according to claim 4, characterized in that: The long strip hole has a straight section, and the strip-shaped flange forms two parallel straight arms.

6. The conductive sheet according to claim 5, characterized in that: The convex point is arranged to be located at the center of the through hole, and the convex height of the convex point is 0.2-0.4 mm, and the diameter thereof is 1-1.5 mm.

7. The conductive sheet according to claim 6, wherein: A circular arc groove is formed at the connection between the strip-shaped flange and the base.

8. The conductive sheet according to claim 1, wherein: The conductive sleeve and the conductive core form a power battery connection structure.

9. The conductive sheet according to claim 8, characterized in that: When the core body is sleeved with the conductive sleeve, the elastic conductive member is clamped by the outer wall of the core body and the inner wall of the conductive sleeve.

10. The conductive sheet according to claim 9, characterized in that: The inner wall of the conductive sleeve is provided with one or more conductive annular grooves, the elastic conductive member is arranged in the conductive annular grooves, and the elastic conductive member is interference-fitted with the conductive annular grooves.

11. The conductive sheet according to any one of claims 8 to 10, characterized in that: The elastic conductive member is an annular conductive spring.

12. The conductive sheet according to claim 1, wherein: The inner wall of the conductive sleeve is provided with at least one first sealing ring groove, the first sealing ring groove is provided between the elastic conductive part and the opening of the conductive sleeve sleeve core body, and a first sealing ring is provided in the first sealing ring groove.

13. The conductive sheet according to claim 1, wherein: An annular limiting ring is also provided on the outer wall at the middle position of the sleeve.

14. The conductive sheet according to claim 12 or 13, characterized in that: The core body comprises a first core body and second core bodies at both ends thereof, the diameter of the second core body is smaller than that of the first core body, the diameter of the first core body is adapted to the inner diameter of the core barrel, and the second core body is connected to the sleeve of the conductive sleeve.

15. The conductive sheet according to claim 14, characterized in that: The core barrel comprises a barrel body, and at least one second sealing ring is respectively arranged on the inner walls at both ends of the barrel body and on the outer wall of the second core body.

16. The conductive sheet according to claim 15, characterized in that: A second sealing ring groove is provided on the inner wall of the cylinder at the junction of the first core body and the second core body, both ends of the second sealing ring groove have protrusions on the inner wall of the cylinder, and the second sealing ring is confined in the second sealing ring groove.

17. A power battery module, comprising a battery cell, characterized in that: The power battery module further comprises a conductive sheet as described in any one of claims 1 to 16, wherein the conductive sheet is used to electrically connect the battery cells.

18. A power battery box, comprising a box body and a battery module, wherein the battery module is placed in the box body, characterized in that: A plurality of battery modules as claimed in claim 17 that are fixedly arranged side by side constitute a battery module.

19. The power battery box according to claim 18, characterized in that: The conductive sleeve is electrically connected to a conductive sleeve on another battery module through a conductive core, thereby achieving electrical conduction between the plurality of battery modules.

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