Current collecting assembly and battery module

Abstract

The utility model relates to the technical field of batteries, in particular to a current collecting assembly and a battery module. The current collecting assembly comprises a substrate, a cover plate and a covering part. A first through hole is formed in the substrate; the cover plate covers the substrate, a second through hole is formed in the cover plate, and the second through hole is communicated with the first through hole; the covering part comprises a first part, the first part is arranged on the side, away from the substrate, of the cover plate, and the first part covers the second through hole. According to the current collecting assembly and the battery module provided by the embodiment of the invention, the first part of the covering part covers the second through hole, and a high-temperature substance can enter one side, deviating from the battery cell assembly, of the current collecting assembly from the gap between the first part and the cover plate; and the second through holes corresponding to the other cells without thermal runaway are always covered by the first part, so that the high-temperature substances cannot flow to the other cells without thermal runaway through the first through holes and the second through holes, the problem that the high-temperature substances sprayed out of the cells fall back to the cells can be solved, and the problem of thermal runaway diffusion of the cells is solved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a current collecting assembly and a battery module. Background Art

[0002] The battery module usually includes a fireproof board and multiple battery cells. The fireproof board cover is set above the multiple battery cells. An explosion-proof valve is set on the top of each battery cell. The fireproof board has a through hole corresponding to the explosion-proof valve. When the battery cell is thermally runaway, the high-temperature material sprayed out by the explosion-proof valve will be sprayed out from the through hole of the fireproof board, so that the high-temperature material will fall above the fireproof board when it falls back, which can prevent the high-temperature material from falling back to the battery cell.

[0003] However, since the fireproof plate is provided with through holes corresponding to the explosion-proof valve of each battery cell, part of the high-temperature material that falls back to the top of the fireproof plate still falls back to the battery cell, causing the spread of thermal runaway. Utility Model Content

[0004] The embodiments of the present application aim to provide a current collecting assembly and a battery module, so as to at least improve the problem of high-temperature substances ejected from the battery cells falling back into the battery cells.

[0005] In order to solve the above technical problems, the embodiments of the present application adopt the following technical solutions:

[0006] In a first aspect, an embodiment of the present application provides a current collecting assembly, which includes a substrate, a cover plate and a covering member; the substrate is provided with a first through hole; the cover plate is covered on the substrate, the cover plate is provided with a second through hole, and the second through hole is connected to the first through hole; the covering member includes a first part, the first part is arranged on a side of the cover plate away from the substrate, and the first part covers the second through hole.

[0007] In some embodiments, the covering member further includes a second portion, two ends of the second portion are respectively connected to the cover plate and the first portion, and the second portion is deformable.

[0008] In some embodiments, the covering member also includes a third part, which is arranged on the side of the cover plate facing away from the substrate, and the third part is provided with a third through hole, which is connected to the second through hole, the first part is located in the third through hole, and the two ends of the second part are respectively connected to the first part and the third part.

[0009] In some embodiments, a first mounting groove and a second mounting groove are provided on a side of the substrate facing the cover plate, two fourth through holes are provided on the bottom wall of the first mounting groove, and the two fourth through holes are spaced apart along the first direction, and a fifth through hole is provided on the bottom wall of the second mounting groove; the current collecting assembly also includes a first conductor and a second conductor, the first conductor is arranged in the first mounting groove, the second conductor includes a connecting part and a lead-out part, the connecting part is arranged in the second mounting groove, and the lead-out part is arranged in the connecting part; wherein, along the first direction, the width of the first conductor is smaller than the width of the first mounting groove, and / or, along the first direction, the width of the connecting part is smaller than the width of the second mounting groove.

[0010] In some embodiments, a first elastic portion is provided in the middle of the first conductive member along the first direction; and / or the connecting portion and the lead-out portion are spaced apart along the first direction, and the second conductive member further includes a second elastic portion, and two ends of the second elastic portion are respectively connected to the connecting portion and the lead-out portion.

[0011] In some embodiments, at least one of the two side walls of the first mounting groove that are relatively arranged along the second direction is provided with a first protrusion, and the first protrusion abuts against the side of the first guiding member that is away from the bottom wall of the first mounting groove; and / or, at least one of the two side walls of the second mounting groove that are relatively arranged along the second direction is provided with a second protrusion, and the second protrusion abuts against the side of the connecting portion that is away from the bottom wall of the second mounting groove; wherein the second direction is perpendicular to the first direction, and the second direction is parallel to the substrate.

[0012] In some embodiments, the first guiding member is provided with a first limiting hole, and the bottom wall of the first mounting groove is provided with a first limiting column, which is arranged in the first limiting hole, and along the first direction, the width of the first limiting column is smaller than the width of the first limiting hole; and / or, the connecting portion is provided with a second limiting hole, and the bottom wall of the second mounting groove is provided with a second limiting column, which is arranged in the second limiting hole, and along the first direction, the width of the second limiting column is smaller than the width of the second limiting hole.

[0013] In some embodiments, the lead-out portion is provided with a first connection hole along a direction perpendicular to the substrate, and the first connection hole extends along the first direction; and / or the connection portion is provided with a welding portion, and along the thickness direction of the connection portion, the thickness of the welding portion is less than the thickness of other portions of the connection portion.

[0014] In some embodiments, the current collecting assembly also includes a conductive member and a collection buckle, the conductive member is provided with a clamping hole; the collection buckle includes a clamping portion and a stop portion, the clamping portion is passed through the clamping hole, the stop portion is arranged at the front end of the clamping portion, and the stop portion is used to abut against the edge of the clamping hole to prevent the clamping portion from leaving the clamping hole.

[0015] In a second aspect, an embodiment of the present application provides a battery module, wherein the battery module includes a current collecting assembly as described in any one of the above items.

[0016] In the current collecting assembly and battery module of the embodiment of the present application, the first part of the covering member covers the second through hole, and the high-temperature material can enter the side of the current collecting assembly away from the battery cell assembly from the gap between the first part and the cover plate; and the second through holes corresponding to other battery cells that have not experienced thermal runaway are always covered by the first part, so the high-temperature material cannot flow through the first through hole and the second through hole to other battery cells that have not experienced thermal runaway, which can improve the problem of high-temperature material sprayed from the battery cell falling back to the battery cell and improve the problem of thermal runaway spreading of the battery cell.

[0017] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] One or more embodiments are exemplarily described by corresponding drawings, which do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and the figures in the drawings do not constitute proportional limitations unless otherwise stated.

[0019] Figure 1 is a schematic structural diagram of a battery module according to an embodiment of the present application;

[0020] Figure 2 is an exploded view of a battery module of an embodiment of the present application;

[0021] Figure 3 yes Figure 2 Schematic diagram of the structure of the middle current collecting assembly;

[0022] Figure 4 yes Figure 2 Exploded view of the middle header assembly;

[0023] Figure 5 yes Figure 2 A three-dimensional cross-sectional view of the middle current collecting assembly;

[0024] Figure 6is an exploded view of a partial structure of a current collecting assembly according to an embodiment of the present application;

[0025] Figure 7 yes Figure 6 The structural diagram of the acquisition buckle;

[0026] Figure 8 yes Figure 6 A cross-sectional view of the buckle structure is collected in the figure.

[0027] The reference numerals in the specific implementation manner are as follows:

[0028] 100. Battery module;

[0029] 1. First shell; 2. Second shell;

[0030] 3. Battery cell assembly; 31. Battery cell; 311. Pole; 312. Explosion-proof valve;

[0031] 4. Current collecting components;

[0032] 41, substrate; 411, first through hole; 412, connecting column; 413, wire hole; 414, first mounting groove; 4141, first convex portion; 4142, first limiting column; 415, fourth through hole; 416, second mounting groove; 4161, second convex portion; 4162, second limiting column; 417, fifth through hole;

[0033] 42. Cover plate; 421. Second connecting hole; 422. Second through hole;

[0034] 43. Covering member; 431. First portion; 432. Second portion; 433. Third portion; 4331. Third through hole;

[0035] 44, guide member; 441, first guide member; 4411, first elastic part; 4412, first limiting hole; 442, second guide member; 4421, connecting part; 4422, lead-out part; 4423, second elastic part; 4424, second limiting hole; 4425, first connecting hole; 4426, welding part; 4427, groove; 443, clamping hole;

[0036] 45, collection buckle; 451, clamping part; 4511, first wall; 4512, second wall; 4513, third wall; 4514, sixth through hole; 452, stopper; 453, clamping part;

[0037] X, first direction; Y, second direction. DETAILED DESCRIPTION

[0038] In order to facilitate the understanding of the present application, the present application is described in more detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application. It should be noted that when an element is described as "fixed to" another element, it can be directly on the other element, or there can be one or more centered elements therebetween. When an element is described as "connected to" another element, it can be directly connected to the other element, or there can be one or more centered elements therebetween.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0040] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0041] In the description of the embodiments of the present application, the use of words such as "first" and "second" to define components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above words have no special meanings and therefore cannot be understood as limiting the scope of protection of the present application. In the description of the embodiments of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0042] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in this specification includes any and all combinations of one or more of the related listed items.

[0043] In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0044] The present application embodiment provides a battery module 100, such as Figure 1 and Figure 2 As shown, the battery module 100 can be in the shape of a cuboid. The battery module 100 includes a first shell 1, a second shell 2, a battery cell assembly 3 and a current collecting assembly 4. Among them, the first shell 1 is in the shape of a rectangular plate, the second shell 2 is in the shape of a shell with an opening at one end, the second shell 2 is covered on one side of the first shell 1, and the battery cell assembly 3 and the current collecting assembly 4 are both arranged between the first shell 1 and the second shell 2 to protect the battery cell assembly 3 and the current collecting assembly 4. Optionally, the first shell 1 is a liquid cooling plate, which can take away the heat of the battery cell assembly 3 and reduce the temperature of the battery cell assembly 3.

[0045] For the above-mentioned battery cell assembly 3, if Figure 2 As shown, the battery cell assembly 3 includes a plurality of stacked battery cells 31. The battery cell 31 may be in the shape of a rectangular parallelepiped, and a plurality of battery cells 31 are stacked along the thickness direction thereof. Among them, the battery cells 31 of the battery cell assembly 3 are electrically connected in series, and the battery cells 31 are secondary batteries, for example, they may be lithium-ion battery cells 31. The battery module 100 may include a plurality of battery cell assemblies 3, and the plurality of battery cell assemblies 3 are arranged in a direction parallel to the first housing 1, and the arrangement direction of the battery cell assembly 3 may be perpendicular to the stacking direction of the battery cells 31. The plurality of battery cell assemblies 3 may be electrically connected in series or in parallel. In some embodiments, the number of battery cells 31 in the battery cell assembly 3 is thirteen, and the thirteen battery cells 31 are electrically connected in series.

[0046] For the convenience of description, the direction in which the battery cells 31 are stacked is defined as a first direction X, and the direction in which the plurality of battery cell assemblies 3 are arranged is defined as a second direction Y.

[0047] like Figure 2 As shown, two poles 311 are arranged on one side of the battery cell 31 away from the first housing 1 , and the two poles 311 are arranged along the second direction Y. The two poles 311 have different polarities, and the two poles 311 are electrically connected to the current collecting assembly 4 , so as to be electrically connected to the power bus (not shown) through the current collecting assembly 4 .

[0048] like Figure 2 As shown, the battery cell 31 is provided with an explosion-proof valve 312, which is used to release the high-temperature material in the battery cell 31 when the battery cell 31 has thermal runaway, so as to improve the problem of explosion of the battery cell 31. The explosion-proof valve 312 is located on the side of the battery cell 31 away from the first housing 1 and between the two poles 311.

[0049] For the above-mentioned current collecting assembly 4, as Figure 2As shown, the current collecting assembly 4 is arranged on the side of the battery cell assembly 3 away from the first housing 1, and the current collecting assembly 4 electrically connects the multiple battery cells 31 in the battery cell assembly 3 in series. When the number of battery cell assemblies 3 is multiple, the number of current collecting assemblies 4 is also multiple, and one current collecting assembly 4 corresponds to the first battery cell assembly 3 to electrically connect the battery cells 31 in each battery cell assembly 3 in series. Among them, the current collecting assemblies 4 can also be electrically connected in series or in parallel to connect multiple battery cell assemblies 3 in series or in parallel. In some embodiments, the number of battery cell assemblies 3 is four, and the four battery cell assemblies 3 are electrically connected in series.

[0050] like Figure 3 and Figure 4 As shown, the current collecting assembly 4 includes a substrate 41, a cover plate 42, and a cover 43. The cover plate 42 is covered on the substrate 41, and the cover 43 is covered on the side of the cover plate 42 away from the substrate 41. Among them, the substrate 41 is arranged on the side of the battery cell assembly 3 away from the first housing 1, and the substrate 41 is parallel to the first direction X and the second direction Y, and the cover plate 42 is located on the side of the substrate 41 away from the battery cell assembly 3. Optionally, the substrate 41 is detachably arranged on the battery cell assembly 3 by screws.

[0051] For the above substrate 41, Figure 4 As shown, the substrate 41 is provided with a first through hole 411, and the first through hole 411 may be substantially circular. Figure 6 As shown, the first through hole 411 corresponds to the position of the explosion-proof valve 312 of the battery cell 31, that is, when observing along the direction in which the current collecting assembly 4 and the battery cell assembly 3 are arranged, the explosion-proof valve 312 and the first through hole 411 at least partially overlap, so that when the explosion-proof valve 312 sprays out high-temperature substances, the high-temperature substances can be sprayed out through the first through hole 411 to the side of the substrate 41 away from the battery cell assembly 3. It can be understood that the number of first through holes 411 is multiple, and each first through hole 411 corresponds to an explosion-proof valve 312. Further, when observing along the direction in which the current collecting assembly 4 and the battery cell assembly 3 are arranged, the explosion-proof valve 312 is located in the first through hole 411, so that the substrate 41 does not block the explosion-proof valve 312, thereby improving the passability of high-temperature substances through the first through hole 411. Optionally, the substrate 41 is made of flame-retardant material.

[0052] like Figure 4 and Figure 6 As shown, a connecting column 412 is provided on one side of the base plate 41 facing the cover plate 42, and a second connecting hole 421 is provided on the cover plate 42 corresponding to the connecting column 412. The connecting column 412 is used for screws to pass through the second connecting hole 421 and connect with the connecting column 412, so as to detachably connect the cover plate 42 to the base plate 41. Optionally, the number of the connecting column 412 and the second connecting hole 421 are both multiple, so as to enhance the stability of the connection between the cover plate 42 and the base plate 41.

[0053] like Figure 4 and Figure 6 As shown, the base plate 41 is provided with a wire hole 413 for passing wires through, thereby facilitating fixing the cables to the base plate 41 and improving the problem of the cables being messy and easy to shake.

[0054] For the above-mentioned cover plate 42, if Figure 4 As shown, the cover plate 42 is provided with a second through hole 422, and the second through hole 422 is connected to the first through hole 411. Therefore, when the explosion-proof valve 312 sprays high-temperature substances, the high-temperature substances can enter the side of the cover plate 42 away from the battery cell assembly 3 from the first through hole 411 and the second through hole 422, so as to improve the problem that the high-temperature substances enter between the substrate 41 and the cover plate 42 and damage the components between the substrate 41 and the cover plate 42. The falling high-temperature substances will also fall back to the cover plate 42, thereby separating the high-temperature substances from the battery cell 31, and improving the problem that the high-temperature substances sprayed from the battery cell 31 fall back to the battery cell 31. The battery cell 31 here includes the battery cell 31 that sprays high-temperature substances due to thermal runaway, and also includes the battery cell 31 that does not have thermal runaway, so the problem of thermal runaway diffusion of the battery cell 31 can be improved. It can be understood that the number of the second through holes 422 is multiple, and each second through hole 422 corresponds to a first through hole 411. Further, when observing along the direction in which the current collecting assembly 4 and the battery cell assembly 3 are arranged, the first through hole 411 is located in the second through hole 422, or the first through hole 411 and the second through hole 422 completely overlap, so that the cover plate 42 does not block the explosion-proof valve 312, thereby improving the permeability of high-temperature substances through the second through hole 422. Optionally, the cover plate 42 is made of a flame-retardant material, such as a fireproof board.

[0055] For the above-mentioned cover 43, if Figure 4 and Figure 5As shown, the cover 43 includes a first portion 431, which is disposed on a side of the cover plate 42 facing away from the substrate 41, and covers the second through hole 422. It can be understood that due to the existence of the first through hole 411 and the second through hole 422, some high-temperature substances still flow to the battery cell 31 through the first through hole 411 and the second through hole 422. In the present embodiment, the first part 431 is located on the side of the cover plate 42 away from the battery cell 31, and the first part 431 covers the second through hole 422. When the battery cell 31 sprays out high-temperature material, the high-temperature material enters the first through hole 411 and the second through hole 422, and applies a thrust to the first part 431, so that the first part 431 leaves the second through hole 422 or tilts up, and the high-temperature material can enter the side of the current collecting assembly 4 away from the battery cell assembly 3 from the gap between the first part 431 and the cover plate 42, which does not affect the high-temperature material entering the side of the current collecting assembly 4 away from the battery cell assembly 3; and the second through holes 422 corresponding to other battery cells 31 that have not experienced thermal runaway are always covered by the first part 431, so the high-temperature material cannot flow through the first through hole 411 and the second through hole 422 to other battery cells 31 that have not experienced thermal runaway, which can improve the problem of the high-temperature material sprayed from the battery cell 31 falling back to the battery cell 31 and improve the problem of thermal runaway diffusion of the battery cell 31. Optionally, the first part 431 is made of a flame retardant material, such as a fireproof board. Optionally, the first part 431 is a mica tape, and the first part 431 can be pasted on the edge of the second through hole 422 to facilitate the installation of the first part 431.

[0056] Furthermore, if Figure 5As shown, the cover 43 also includes a second part 432, the two ends of which are connected to the cover plate 42 and the first part 431 respectively, and the second part 432 is deformable. The deformability means that when the first part 431 is pushed by the high-temperature material ejected from the battery cell 31, the second part 432 will be deformed, so that the first part 431 leaves the second through hole 422 or tilts up, and the high-temperature material can enter the side of the current collecting assembly 4 away from the battery cell assembly 3 from the gap between the first part 431 and the cover plate 42. When the battery cell 31 no longer ejects high-temperature material, the first part 431 is no longer pushed by the high-temperature material ejected from the battery cell 31, and the first part 431 is re-covered on the second through hole 422 under the action of gravity, preventing the high-temperature material from flowing back to the battery cell 31 through the first through hole 411 and the second through hole 422, further improving the problem of the high-temperature material ejected from the battery cell 31 falling back to the battery cell 31. Optionally, the second part 432 is an elastic member. When the first part 431 is no longer pushed by the high-temperature material ejected from the battery cell 31, the first part 431 is re-covered on the second through hole 422 under the elastic force of the second part 432. Optionally, the second part 432 is made of a flame retardant material and is a flexible material, such as a fireproof film. Optionally, the second part 432 is a mica tape, and one end of the second part 432 connected to the cover plate 42 is directly adhered to the cover plate 42.

[0057] In some other embodiments, the first part 431 is hingedly connected to the cover plate 42, and when the first part 431 is pushed by the high-temperature substance ejected from the battery cell 31, the first part 431 leaves the second through hole 422 or tilts up; when the first part 431 is no longer pushed by the high-temperature substance ejected from the battery cell 31, the first part 431 is re-covered on the second through hole 422 under the action of gravity.

[0058] Furthermore, if Figure 5As shown, the cover 43 also includes a third part 433, which is arranged on the side of the cover plate 42 away from the substrate 41, and the third part 433 is provided with a third through hole 4331, which is connected to the second through hole 422, and the first part 431 is located in the third through hole 4331, and the two ends of the second part 432 are respectively connected to the first part 431 and the third part 433. By setting the third part 433, the connection between the second part 432 and the cover plate 42 is facilitated. It can be understood that the number of the third through holes 4331 is multiple, and each third through hole 4331 corresponds to a second through hole 422. Further, when observing along the direction in which the current collector assembly 4 and the battery cell assembly 3 are arranged, the second through hole 422 is located in the third through hole 4331, or the second through hole 422 and the third through hole 4331 completely overlap, so that the third part 433 does not block the explosion-proof valve 312, and improves the passability of high-temperature substances through the third through hole 4331. Optionally, the third part 433 is made of a flame retardant material, such as a fireproof board. Optionally, the third part 433 is a mica tape, and the third part 433 can be attached to the cover plate 42, so as to facilitate the installation of the third part 433.

[0059] In some embodiments, the first portion 431, the second portion 432 and the third portion 433 are integrally formed, for example, the first portion 431, the second portion 432 and the third portion 433 are formed by punching a mica tape. The shape of the first portion 431 may be the same as the shape of the cross section of the third through hole 4331, and the size of the first portion 431 is smaller than the size of the cross section of the third through hole 4331.

[0060] In some embodiments, the first through hole 411 , the second through hole 422 , and the third through hole 4331 are all waist-shaped holes, and the axes of the first through hole 411 , the second through hole 422 , and the third through hole 4331 coincide with each other.

[0061] In some embodiments, Figure 3 As shown, the current collecting assembly 4 also includes a conductive member 44, which is arranged on the substrate 41. The conductive member 44 is used to electrically connect two adjacent battery cells 31, or the conductive member 44 is used to extend from the substrate 41 to facilitate the electrical connection of the current collecting assembly 4 with the power bus. Optionally, the substrate 41 and the cover plate 42 are made of insulating materials, such as plastic materials, to increase the insulation between the conductive members 44. Optionally, the conductive member 44 is made of a material with strong conductivity, such as copper or aluminum.

[0062] like Figure 4 and Figure 6As shown, a first mounting groove 414 is provided on one side of the substrate 41 facing the cover plate 42, and two fourth through holes 415 are provided on the bottom wall of the first mounting groove 414, and the fourth through holes 415 are used for the pole 311 to extend into the first mounting groove 414. The fourth through holes 415 correspond to the positions of the poles 311 of the battery cells 31. Since the battery cells 31 are stacked along the first direction X, the two fourth through holes 415 are arranged at intervals along the first direction X, and each pole 311 of two adjacent battery cells 31 can extend into the first mounting groove 414 through the two fourth through holes 415, respectively. The conductive member 44 includes a first conductive member 441, which is disposed in the first mounting groove 414. The first conductive member 441 can be electrically connected to the two poles 311 in the first mounting groove 414 to electrically connect the two adjacent battery cells 31. It can be understood that the polarities of the two poles 311 extending into the first mounting groove 414 are different.

[0063] like Figure 4 and Figure 6 As shown, a second mounting groove 416 is provided on one side of the substrate 41 facing the cover plate 42, and a fifth through hole 417 is provided on the bottom wall of the second mounting groove 416. The fifth through hole 417 is used for the pole 311 to extend into the second mounting groove 416. The fifth through hole 417 corresponds to the position of the pole 311 of the battery cell 31, and one pole 311 of one battery cell 31 can extend into the second mounting groove 416 through the fifth through hole 417. The conductive member 44 includes a second conductive member 442, and the second conductive member 442 includes a connecting portion 4421 and a lead-out portion 4422. The connecting portion 4421 is disposed in the second mounting groove 416, and the connecting portion 4421 can be electrically connected to the pole 311 in the second mounting groove 416. The lead-out portion 4422 is disposed in the connecting portion 4421 to electrically connect the lead-out portion 4422 to the battery cell 31, and the lead-out portion 4422 can be electrically connected to the power bus. Further, as Figure 4 As shown, along the first direction X, the lead-out portion 4422 extends out of the substrate 41 , thereby facilitating electrical connection with the power bus.

[0064] like Figure 4 and Figure 6As shown, along the first direction X, the width of the first conductor 441 is less than the width of the first mounting groove 414. The "width" here does not specifically refer to the width of an object, but may also be the length or height of an object, in order to illustrate the two-dimensional size of an object along a certain direction. Since the width of the first mounting groove 414 is greater than the width of the first conductor 441, the first conductor 441 can adjust its position in the first mounting groove 414 along the first direction X to eliminate the position deviation between the first conductor 441 and the pole 311. For example, if the position of the substrate 41 installed in the battery cell assembly 3 along the first direction X has a deviation, then the position of the pole 311 in the first mounting groove 414 has a deviation along the first direction X, and by adjusting the position of the first conductor 441 in the first mounting groove 414 along the first direction X, the first conductor 441 can be connected to the pole 311 normally to eliminate the position deviation between the first conductor 441 and the pole 311.

[0065] like Figure 6 As shown, along the first direction X, the width of the connecting portion 4421 is smaller than the width of the second installation slot 416. Similarly, the connecting portion 4421 can be adjusted in the second installation slot 416 along the first direction X to eliminate the position deviation between the second conductive member 442 and the pole 311.

[0066] like Figure 6 As shown, a first elastic portion 4411 is provided in the middle of the first conductive member 441 along the first direction X. By applying an external force to the first elastic portion 4411, the length of the first conductive member 441 along the first direction X can be changed to adapt to different spacings between the two poles 311 extending into the first mounting groove 414. For example, the thicknesses of the battery cells 31 of different capacities may be different, resulting in different spacings between the two poles 311 extending into the first mounting groove 414 along the first direction X. By adjusting the length of the first conductive member 441 along the first direction X, the battery cells 31 of different capacities or different thicknesses can be adapted. For another example, a heat insulation layer needs to be provided between the battery cells 31, or the thickness dimension of the battery cells 31 has a tolerance, resulting in different spacings between the two poles 311 extending into the first mounting groove 414 along the first direction X. By adjusting the length of the first conductor 441 along the first direction X, the position deviation of the pole 311 and the first conductor 441 along the first direction X can be eliminated, and heat insulation layers of different thicknesses can be provided between the battery cells 31. In addition, when the battery cell 31 expands, the pole 311 will pull the first conductor 441, causing the first elastic part 4411 to deform to increase the length of the first conductor 441 along the first direction X, release the stress generated by the expansion of the battery cell 31, and improve the problem of disconnection between the pole 311 and the first conductor 441 due to the expansion of the battery cell 31. Optionally, the first elastic part 4411 is a curved part formed by bending the middle part of the first conductor 441 along the first direction X.

[0067] like Figure 6 As shown, the connection part 4421 and the lead part 4422 are arranged at intervals along the first direction X, and the second conductive member 442 further includes a second elastic part 4423, and the two ends of the second elastic part 4423 are respectively connected to the connection part 4421 and the lead part 4422. When the position of the power bus and the substrate 41 along the first direction X deviates, by applying an external force to the second elastic part 4423, the length of the lead part 4422 extending out of the substrate 41 can be changed, and the position deviation of the power bus and the lead part 4422 along the first direction X can be eliminated. In addition, when the battery cell 31 expands, the pole 311 will pull the connection part 4421, so that the second elastic part 4423 is deformed to change the length of the second conductive member 442 along the first direction X, release the stress generated by the expansion of the battery cell 31, improve the problem of disconnection between the pole 311 and the connection part 4421 caused by the expansion of the battery cell 31, and improve the problem of disconnection between the lead part 4422 and the power bus caused by the expansion of the battery cell 31. Optionally, the connecting portion 4421 , the lead-out portion 4422 and the second elastic portion 4423 are integrally formed, and the second elastic portion 4423 is a bent portion formed by bending the middle portion of the second connecting member 442 along the first direction X.

[0068] like Figure 6 As shown, at least one of the two side walls of the first mounting groove 414 that are arranged opposite to each other along the second direction Y is provided with a first convex portion 4141, and the first convex portion 4141 abuts against the side of the first conductive member 441 that is away from the bottom wall of the first mounting groove 414. By abutting the first convex portion 4141 against the first conductive member 441, the first conductive member 441 can be prevented from being separated from the first mounting groove 414, so as to facilitate the welding connection or screw connection between the first conductive member 441 and the pole 311. There are multiple first convex portions 4141 to enhance the limiting effect on the first conductive member 441. When the first conductive member 441 is in the shape of a rectangular sheet, multiple first convex portions 4141 can be respectively arranged adjacent to the four corners of the first conductive member 441 to improve the problem that one end of the first conductive member 441 is separated from the first mounting groove 414. Further, the first protrusion 4141 and the two side walls of the first installation groove 414 along the first direction X have a preset distance; along the first direction X, the preset distance is greater than the difference between the width of the first installation groove 414 and the width of the first guide member 441, so when the position of the first guide member 441 in the first installation groove 414 is adjusted along the first direction X, the first protrusion 4141 always abuts against the first guide member 441, and does not affect the limiting effect of the first protrusion 4141 on the first guide member 441.

[0069] like Figure 6As shown, at least one of the two side walls of the second mounting groove 416 that are arranged opposite to each other along the second direction Y is provided with a second protrusion 4161, and the second protrusion 4161 abuts against the side of the connecting portion 4421 that is away from the bottom wall of the second mounting groove 416. By the second protrusion 4161 abutting against the connecting portion 4421, the connecting portion 4421 can be prevented from being separated from the second mounting groove 416, so that the connecting portion 4421 is welded or screwed to the pole 311. There are multiple second protrusions 4161 to enhance the limiting effect on the connecting portion 4421. When the connecting portion 4421 is in the shape of a rectangular sheet, multiple second protrusions 4161 can be respectively arranged adjacent to the four corners of the connecting portion 4421 to improve the problem that one end of the connecting portion 4421 is separated from the first mounting groove 414. Furthermore, the second protrusion 4161 and the two side walls of the second mounting groove 416 along the first direction X have a preset distance; along the first direction X, the preset distance is greater than the difference between the width of the second mounting groove 416 and the width of the connecting portion 4421. When the connecting portion 4421 is adjusted in the position of the second mounting groove 416 along the first direction X, the second protrusion 4161 always abuts against the connecting portion 4421, and does not affect the limiting position of the connecting portion 4421 by the second protrusion 4161.

[0070] like Figure 6 As shown, the first guide member 441 is provided with a first limiting hole 4412, and the bottom wall of the first installation groove 414 is provided with a first limiting column 4142, and the first limiting column 4142 is arranged in the first limiting hole 4412. When installing the first guide member 441, the first limiting column 4142 can be inserted into the first limiting hole 4412, so as to facilitate the installation of the first guide member 441; after the first guide member 441 is installed, the first limiting column 4142 is inserted into the first limiting hole 4412, which can reduce the shaking of the first guide member 441 along the first direction X and the second direction Y. Further, along the first direction X, the width of the first limiting column 4142 is smaller than the width of the first limiting hole 4412, so that the first limiting column 4142 can move in translation in the first limiting hole 4412 along the first direction X, and the first guide member 441 can adjust its position in the first installation groove 414 along the first direction X. Optionally, the first limiting hole 4412 is a waist-shaped hole.

[0071] like Figure 6As shown, the connecting portion 4421 is provided with a second limiting hole 4424, and the bottom wall of the second mounting groove 416 is provided with a second limiting column 4162, and the second limiting column 4162 is arranged in the second limiting hole 4424. When installing the second guide member 442, the second limiting column 4162 can be inserted into the second limiting hole 4424, so as to facilitate the installation of the second guide member 442; after the second guide member 442 is installed, the second limiting column 4162 is inserted into the second limiting hole 4424, which can reduce the shaking of the connecting portion 4421 along the first direction X and the second direction Y. Further, along the first direction X, the width of the second limiting column 4162 is smaller than the width of the second limiting hole 4424, so that the second limiting column 4162 can move in translation in the second limiting hole 4424 along the first direction X, and the connecting portion 4421 can adjust its position in the second mounting groove 416 along the first direction X. Optionally, the second limiting hole 4424 is a waist-shaped hole.

[0072] like Figure 6 As shown, the lead-out portion 4422 is provided with a first connection hole 4425 in a direction perpendicular to the substrate 41, that is, the first connection hole 4425 is provided in the thickness direction of the lead-out portion 4422. The first connection hole 4425 is used to penetrate a screw to connect the lead-out portion 4422 to the power bus by means of a screw. Furthermore, the first connection hole 4425 extends along the first direction X, so that the position of the power bus relative to the lead-out portion 4422 along the first direction X can be adjusted. Even if the power bus and the lead-out portion 4422 have a position deviation along the first direction X, the power bus and the lead-out portion 4422 can still be connected normally, thereby improving the fault tolerance of the connection between the power bus and the lead-out portion 4422.

[0073] like Figure 6 As shown, the connection part 4421 is provided with a welding part 4426, and along the thickness direction of the connection part 4421, the thickness of the welding part 4426 is less than the thickness of other parts of the connection part 4421. The welding part 4426 is used for welding connection with the pole 311. The thickness of the welding part 4426 is thinner than other parts, which is conducive to reducing the difficulty of welding connection between the connection part 4421 and the pole 311, and other parts of the connection part 4421 can still meet the original current overcurrent requirements. Optionally, a groove 4427 is provided on the side of the connection part 4421 away from the battery cell 31 to form the welding part 4426. It can be understood that the groove 4427 corresponds to the position of the pole 311, that is, when observed along the direction of arrangement of the connection part 4421 and the battery cell 31, the pole 311 is located in the groove 4427. Optionally, the groove 4427 has the same shape as the pole 311, and the size of the groove 4427 is greater than or equal to the size of the pole 311 to ensure that the welding portion 4426 can completely cover the pole 311. Optionally, the groove 4427 is formed by thinning the connecting portion 4421 through a cold heading process.

[0074] like Figure 6 As shown, the conductive part 44 is provided with a snap-in hole 443, and the first conductive part 441 and the second conductive part 442 are both provided with a snap-in hole 443; the current collecting component 4 also includes a collection buckle 45, and the collection buckle 45 is used to snap-in and connect with the snap-in hole 443, so that the collection buckle 45 can be pre-positioned, which is convenient for welding the collection buckle 45 and the conductive part 44; after welding, the snap-in connection between the collection buckle 45 and the snap-in hole 443 can also increase the connection strength between the collection buckle 45 and the conductive part 44, and improve the reliability of the connection. Among them, the collection buckle 45 is used to connect a collection cable (not shown), and the number of the snap-in holes 443 can be multiple, for example, the number of the snap-in holes 443 is two, and the conductive part 44 can be connected to two collection cables, and the two collection cables can be used to collect the temperature information of the conductive part 44 and the voltage information of the battery cell 31 respectively. Optionally, the collection buckle 45 is made of a material with strong conductivity, such as copper or aluminum.

[0075] like Figure 7 As shown, the collection buckle 45 includes a clamping portion 451, which is inserted into the clamping hole 443 to clamp the collection buckle 45 to the clamping hole 443. There may be friction between the clamping portion 451 and the inner wall of the clamping hole 443 to prevent the clamping portion 451 from being separated from the clamping hole 443. Optionally, the clamping hole 443 is rectangular, and the clamping portion 451 is in the shape of a cuboid.

[0076] like Figure 7 and Figure 8 As shown, the clamping portion 451 includes a first wall 4511, a second wall 4512 and a third wall 4513 connected in sequence, the first wall 4511 is parallel to the second wall 4512, and the first wall 4511 and the third wall 4513 are respectively against the opposite sides of the inner wall of the clamping hole 443 to clamp the collection buckle 45 to the clamping hole 443. Optionally, the second wall 4512 is perpendicular to the first wall 4511 and the third wall 4513. Optionally, the first wall 4511, the second wall 4512 and the third wall 4513 are integrally formed, and the clamping portion 451 is formed by bending the collection buckle 45.

[0077] like Figure 8 As shown, the collection buckle 45 further includes a stopper 452, which is arranged at the front end of the clamping portion 451 and is used to abut against the edge of the clamping hole 443. The front end of the clamping portion 451 refers to the end of the clamping portion 451 that first enters the clamping hole 443 when the clamping portion 451 is inserted into the clamping hole 443. When the clamping portion 451 is fully inserted into the preset position, the front end of the clamping portion 451 extends out of the clamping hole 443, and the stopper 452 is arranged at the front end of the clamping portion 451 and is used to abut against the edge of the clamping hole 443, thereby preventing the clamping portion 451 from leaving the clamping hole 443.

[0078] like Figure 8 As shown, the clamping portion 451 is provided with a sixth through hole 4514, and the stopper 452 is disposed in the through hole, one end of the stopper 452 is connected to the clamping portion 451, and the other end of the stopper 452 extends toward the direction of the guide member 44, and the other end of the stopper 452 protrudes from the sixth through hole 4514. When the clamping portion 451 penetrates into the clamping hole 443, the inner wall of the clamping hole 443 presses the stopper 452, so that the stopper 452 retracts into the sixth through hole 4514; when the front end of the clamping portion 451 passes through the clamping hole 443, the stopper 452 protrudes from the sixth through hole 4514 again, so that the stopper 452 can abut against the edge of the clamping hole 443, preventing the clamping portion 451 from leaving the clamping hole 443. Optionally, the first wall 4511 and the third wall 4513 are both provided with a sixth through hole 4514 , and the two sixth through holes 4514 are both provided with a stopper 452 to enhance the effect of preventing the clamping portion 451 from leaving the clamping hole 443 .

[0079] like Figure 8 As shown, the acquisition buckle 45 also includes a clamping portion 453, which is used to clamp the core of the acquisition cable to electrically connect the acquisition cable to the acquisition buckle 45, and facilitate the welding connection between the acquisition cable and the acquisition buckle 45.

[0080] In the current collecting assembly 4 and the battery module 100 of the embodiment of the present application, the first part 431 of the cover 43 covers the second through hole 422, and the high-temperature material can enter the current collecting assembly 4 from the gap between the first part 431 and the cover plate 42 to the side of the battery cell assembly 3 away from the current collecting assembly 4; and the second through hole 422 corresponding to the other battery cells 31 that have not experienced thermal runaway is always covered by the first part 431, so the high-temperature material cannot flow through the first through hole 411 and the second through hole 422 to the other battery cells 31 that have not experienced thermal runaway, which can improve the problem of the high-temperature material ejected from the battery cell 31 falling back to the battery cell 31 and improve the problem of thermal runaway diffusion of the battery cell 31. The first conductor 441 can adjust its position in the first installation groove 414 along the first direction X to eliminate the position deviation between the first conductor 441 and the pole 311; the connecting portion 4421 can adjust its position in the second installation groove 416 along the first direction X to eliminate the position deviation between the second conductor 442 and the pole 311. The length of the first conductive member 441 along the first direction X can be changed to adapt to the different spacings between the two poles 311 extending into the first mounting groove 414, and release the stress caused by the expansion of the battery cell 31; the length of the lead-out portion 4422 extending out of the substrate 41 can be changed to eliminate the position deviation between the power bus and the lead-out portion 4422 along the first direction X, and release the stress caused by the expansion of the battery cell 31. The acquisition buckle 45 is connected to the clamping hole 443 by clamping, and the acquisition buckle 45 can be pre-positioned, which facilitates the welding of the acquisition buckle 45 and the conductive member 44, and can also increase the connection strength between the acquisition buckle 45 and the conductive member 44, thereby improving the reliability of the connection.

[0081] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Under the concept of the present application, the technical features in the above embodiments or different embodiments may also be combined, the steps may be implemented in any order, and there are many other changes in different aspects of the present application as described above, which are not provided in detail for the sake of simplicity. Although the present application has been described in detail with reference to the aforementioned embodiments, a person of ordinary skill in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A current collecting assembly, characterized in that: include: A substrate is provided with a first through hole; A cover plate, which is disposed on the substrate, and the cover plate is provided with a second through hole, wherein the second through hole is connected to the first through hole; The covering member comprises a first portion, wherein the first portion is arranged on a side of the cover plate away from the substrate, and the first portion covers the second through hole.

2. The current collecting assembly according to claim 1, characterized in that: The covering member further comprises a second part, two ends of which are respectively connected to the cover plate and the first part, and the second part is deformable.

3. The current collecting assembly according to claim 2, characterized in that: The covering member also includes a third part, which is arranged on a side of the cover plate facing away from the substrate, and the third part is provided with a third through hole, which is connected to the second through hole, the first part is located in the third through hole, and the two ends of the second part are respectively connected to the first part and the third part.

4. The current collecting assembly according to claim 1, characterized in that: The substrate is provided with a first mounting groove and a second mounting groove on one side facing the cover plate, the bottom wall of the first mounting groove is provided with two fourth through holes, the two fourth through holes are spaced apart along the first direction, and the bottom wall of the second mounting groove is provided with a fifth through hole; The current collecting assembly further includes a first conductive member and a second conductive member, the first conductive member is arranged in the first mounting groove, the second conductive member includes a connecting portion and a lead-out portion, the connecting portion is arranged in the second mounting groove, and the lead-out portion is arranged in the connecting portion; Wherein, along the first direction, the width of the first connecting member is smaller than the width of the first mounting groove, and / or, along the first direction, the width of the connecting portion is smaller than the width of the second mounting groove.

5. The current collecting assembly according to claim 4, characterized in that: Along the first direction, a first elastic portion is disposed in the middle of the first connecting member; And / or, the connecting portion and the lead-out portion are spaced apart along the first direction, and the second conductive member further comprises a second elastic portion, and two ends of the second elastic portion are respectively connected to the connecting portion and the lead-out portion.

6. The current collecting assembly according to claim 4, characterized in that: At least one of the two side walls of the first installation slot that are opposite to each other along the second direction is provided with a first protrusion, and the first protrusion abuts against a side of the first connecting member that is away from the bottom wall of the first installation slot; And / or, at least one of the two side walls of the second installation groove that are arranged opposite to each other along the second direction is provided with a second protrusion, and the second protrusion abuts against a side of the connecting portion that is away from the bottom wall of the second installation groove; The second direction is perpendicular to the first direction, and the second direction is parallel to the substrate.

7. The current collecting assembly according to claim 4, characterized in that: The first guide member is provided with a first limiting hole, the bottom wall of the first installation slot is provided with a first limiting column, the first limiting column is arranged in the first limiting hole, and along the first direction, the width of the first limiting column is smaller than the width of the first limiting hole; And / or, the connecting portion is provided with a second limiting hole, the bottom wall of the second mounting groove is provided with a second limiting column, the second limiting column is arranged in the second limiting hole, and along the first direction, the width of the second limiting column is smaller than the width of the second limiting hole.

8. The current collecting assembly according to claim 4, characterized in that: The lead-out portion is provided with a first connection hole along a direction perpendicular to the substrate, and the first connection hole extends along the first direction; And / or, the connection portion is provided with a welding portion, and along the thickness direction of the connection portion, the thickness of the welding portion is smaller than the thickness of other portions of the connection portion.

9. The current collecting assembly according to any one of claims 1 to 8, characterized in that: The current collecting assembly also includes: The connecting piece is provided with a clamping hole; The collection buckle includes a clamping part and a stopping part, wherein the clamping part is passed through the clamping hole, the stopping part is arranged at the front end of the clamping part, and the stopping part is used to abut against the edge of the clamping hole to prevent the clamping part from leaving the clamping hole.

10. A battery module, characterized in that: Comprising the current collecting assembly as claimed in any one of claims 1 to 9.

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