Cell Sampling Device, Battery Pack and Battery System

Abstract

The present invention provides a battery cell sampling device, a battery pack and a battery system, including a first guiding component, a second guiding component, a plurality of tab supporting components and a circuit component. Among them, the first guiding component has a first slide rail, and the second guiding component has a second slide rail; both ends of each tab supporting component can slide along the first slide rail and the second slide rail respectively, and under their guidance, a plurality of tab supporting components can be stacked one by one; the second guiding component is arranged to be able to fix the tab supporting component when each tab supporting component slides to the stacking position; the plurality of tab supporting components are used to support the tabs of a plurality of battery cells one by one at the stacking position, and the tab supporting component is arranged to be able to electrically conduct the tab of the corresponding battery cell with the circuit component at the stacking position, and the circuit component is used to detect specified parameters of the plurality of battery cells. The solution of the present invention is convenient to operate and has high working efficiency, and can realize the automation of battery cell assembly and welding.

Description

Technical Field

[0001] The present invention relates to the field of battery manufacturing, and in particular, to a cell sampling device, a battery pack, and a battery system. Background Art

[0002] In the new energy battery industry, when soft-pack cells are stacked into a battery module, the electrical connection of the cells and the voltage and temperature sampling are mainly operated and realized on the tab surface of the battery module. When the cells need to be "connected end to end", the tab surface inside the battery module also loses the operating space. At this time, limited by the space, it will be difficult to operate or automate the voltage and temperature sampling of the cells.

[0003] An existing cell sampling device arranges a Printed Circuit Board Assembly (PCBA) in the gap on one side of the cell tab, and uses the sampling pieces connected on the PCBA to realize voltage sampling by welding with the tabs. However, since the cell module is manufactured layer by layer in an alternating manner of stacking and welding, before welding the sampling pieces, in order to avoid blocking the tabs, the sampling pieces need to be pre-fixed aside, and after stacking the cells of this layer, the corresponding sampling pieces are released and placed on the tabs for welding. This method is cumbersome to operate, has low efficiency and relies on manual labor, and is difficult to automate. Summary of the Invention

[0004] The present invention aims to at least solve one of the technical problems existing in the prior art, and provides a cell sampling device, a battery pack, and a battery system, which are convenient to operate, have high working efficiency, and can realize the automation of cell assembly and welding.

[0005] To achieve the object of the present invention, a cell sampling device is provided for detecting specified parameters of a plurality of stacked cells, including a first guiding component, a second guiding component, a plurality of tab supporting components, and a circuit component. Among them,

[0006] The first guiding component has a first slide rail, and the second guiding component has a second slide rail; both ends of each of the tab supporting components can slide along the first slide rail and the second slide rail respectively, and under their guidance, a plurality of the tab supporting components can be stacked one by one; the second guiding component is configured to fix the tab supporting component when each of the tab supporting components slides to the stacking position.

[0007] A plurality of the tab supporting components are used to support the tabs of a plurality of the cells one by one at the stacking position, and the tab supporting components are configured to electrically conduct the corresponding tabs of the cells with the circuit component at the stacking position, and the circuit component is used to detect the specified parameters of a plurality of the cells.

[0008] Optionally, both the first slide rail and the second slide rail include a linear slide rail arranged along the cell stacking direction and a plurality of inclined slide rails; wherein, the plurality of inclined slide rails are arranged at intervals along the cell stacking direction, and one ends of the plurality of inclined slide rails are all communicated with the linear slide rail, and the other ends of the plurality of inclined slide rails extend obliquely relative to the linear slide rail;

[0009] The ear support assembly can slide into the corresponding inclined slide rail under the guidance of the linear slide rail and slide to the stacking position under the guidance of the corresponding inclined slide rail.

[0010] Optionally, the first guiding assembly includes a first bracket, and the second guiding assembly includes a second bracket; the first bracket and the second bracket are arranged opposite to each other along a first direction and are used for being fixedly connected to the battery box body; the first direction is parallel to a plane perpendicular to the cell stacking direction;

[0011] The first slide rail and the second slide rail are respectively arranged on the first bracket and the second bracket.

[0012] Optionally, a clamping structure is arranged on the second bracket and is used for clamping with the ear support assembly when the ear support assembly slides to the stacking position.

[0013] Optionally, a receiving space with an opening is arranged in the second bracket, and the second slide rail and the clamping structure are both located in the receiving space; one end of the ear support assembly can slide along the second slide rail in the receiving space through the opening.

[0014] Optionally, the clamping structure includes a plurality of elastic clamping members;

[0015] On the inner surface of the second bracket located in the receiving space, a side wall forming the second slide rail is arranged, and a notch is formed at a position corresponding to the inclined slide rail of the side wall, and the elastic clamping member is arranged at the notch and is used for clamping the ear support assembly by generating elastic deformation when one end of the ear support assembly slides along the second slide rail past the elastic clamping member.

[0016] Optionally, one end of the elastic clamping member is connected to one end of the side wall at the notch, the other end of the elastic clamping member is a free end, and when the elastic clamping member is in an original state, it protrudes into the inclined slide rail relative to the inner surface of the side wall, and a hollowed-out part is arranged at a position corresponding to the notch on the second bracket to make the other end of the elastic clamping member a free end.

[0017] Optionally, there are two first slide rails, which are oppositely arranged on both sides of the first bracket along a second direction parallel to a plane perpendicular to the stacking direction of the battery cells and perpendicular to the first direction; there are two second slide rails, which are located in the accommodation space and are opposite to each other along the second direction.

[0018] One end of the tab support assembly is provided with two first sliding members, and the two first sliding members can slide along the two first slide rails respectively; the other end of the tab support assembly is provided with two second sliding members, and the two second sliding members slide along the two second slide rails respectively.

[0019] Optionally, the second bracket includes a first split body and a second split body, which are butted along the second direction to form the accommodation space; the two second slide rails are respectively arranged on two opposite surfaces of the first split body and the second split body.

[0020] Optionally, both the first bracket and the second bracket include a bracket body and a fixing member. Among them, the bracket body is provided with an installation hole penetrating the bracket body along the stacking direction of the battery cells, and a bushing is nested in the installation hole.

[0021] The fixing member passes through the bushing and is used for fixedly connecting with the battery box body.

[0022] Optionally, the bracket body is further provided with a first positioning member, and the first positioning member is used for cooperating with a second positioning member on the battery box body to define the relative position between the bracket body and the battery box body.

[0023] Optionally, the circuit assembly includes a fixing plate, a flexible plate and an external socket. Among them, the fixing plate is arranged in the accommodation space, and the fixing plate has a first plate surface and a second plate surface facing away from each other. Among them, the first plate surface faces the opening of the accommodation space; a part of the flexible plate is attached to the second plate surface, and one end of the flexible plate extends to the outside of the accommodation space and is connected with the external socket; a circuit for detecting specified parameters of a plurality of the battery cells is integrated on the flexible plate, and the circuit transmits electrical signals through the external socket.

[0024] On the fixing plate and on one side of the first plate surface, a plurality of first conductive members are further arranged. Each first conductive member is electrically connected to the circuit, and when the corresponding tab support assembly slides to the stacking position, it is inserted into the tab support assembly to be electrically connected to the tab of the corresponding battery cell through the tab support assembly.

[0025] Optionally, the first conductive member is an elastic member with a socket.

[0026] Each of the tab support assemblies includes a support body, and a second conductive member is provided on the support body of at least one of the tab support assemblies. The second conductive member is configured to be in electrical contact with the tab of the corresponding battery cell when the tab support assembly slides to the stacking position. One end of the second conductive member is provided with a first insertion portion, and the first insertion portion can be inserted into the insertion opening of the corresponding elastic member and be in electrical contact with the elastic member when the tab support assembly slides to the stacking position.

[0027] Optionally, a third conductive member, a temperature sensor, and two connectors are provided on the support body of at least one of the tab support assemblies. The third conductive member is configured to be in electrical contact with the tab of the corresponding battery cell when the tab support assembly slides to the stacking position. One end of the third conductive member is provided with a second insertion portion. The second insertion portion and the two connectors are arranged at intervals in sequence along the battery cell stacking direction, and can be inserted into the insertion openings of the corresponding three elastic members and be in electrical contact with the three elastic members respectively when the tab support assembly slides to the stacking position.

[0028] The detection end of the temperature sensor is in contact with the third conductive member, and the second insertion portion is electrically connected to the third conductive member. The two electrode ends of the temperature sensor are electrically connected to the two connectors respectively. The two connectors are fixed to the third conductive member and are electrically insulated from the third conductive member.

[0029] Optionally, the other two second insertion portions each have pads provided on the support body. The two electrode ends of the temperature sensor each have welding tabs, and the welding tabs are welded to the pads.

[0030] Optionally, a plurality of insulating partitions are further provided on the second bracket and located in the accommodation space. The plurality of insulating partitions are located on the opposite side of the opening of the accommodation space and are arranged at intervals along the battery cell stacking direction. One insulating partition is provided between every two adjacent first conductive members.

[0031] Optionally, the battery cell sampling device further includes a protective cover, which covers the first guiding assembly, the second guiding assembly, and the stacked plurality of tab support assemblies, and is clamped with the adjacent tab support assembly and the second guiding assembly.

[0032] Optionally, at least one limiting protrusion is provided on the surface of the protective cover adjacent to the tab support assembly, and the limiting protrusion abuts against the tab of the battery cell on the adjacent tab support assembly.

[0033] As another technical solution, the present invention further provides a battery pack, including a battery box body and a stack of battery cells disposed in the battery box body. The stack of battery cells includes at least one battery cell group, and the battery cell group includes a plurality of stacked battery cells. The battery pack further includes the above-mentioned battery cell sampling device provided by the present invention, and the battery cell sampling device is disposed in the battery box body.

[0034] As another technical solution, the present invention further provides a battery system, including the above-mentioned battery pack provided by the present invention and a battery management module for regulating the battery pack.

[0035] The present invention has the following beneficial effects:

[0036] For the battery cell sampling device provided by the present invention, through the first slide rail of the first guiding component and the second slide rail of the second guiding component, both ends of each ear support component slide along the first slide rail and the second slide rail. Under their guidance, a plurality of ear support components can be stacked one by one. When each ear support component slides to the stacking position, the second guiding component is used to fix the ear support component to ensure the stability of the stacking structure. At the same time, each ear support component is used to support the corresponding battery cell ear, so as to facilitate welding of the two, realizing electrical conduction between the ear and the circuit component, so that the circuit component can detect specified parameters (such as voltage and temperature) of a plurality of battery cells. The battery cell sampling device provided by the present invention can be manufactured layer by layer in the way of stacking one ear support component, stacking one layer of battery cells and performing welding in a cycle. Under the guiding action of the first slide rail and the second slide rail, the above manufacturing process can be completed by a manipulator without manual operation, thereby improving the operation convenience, improving the work efficiency, and realizing the automation of battery cell assembly and welding.

[0037] For the battery pack provided by the present invention, by adopting the above-mentioned battery cell sampling device provided by the present invention, the operation convenience can be improved, the work efficiency can be improved, and the automation of battery cell assembly and welding can be realized.

[0038] For the battery system provided by the present invention, by adopting the above-mentioned battery pack provided by the present invention, the operation convenience can be improved, the work efficiency can be improved, and the automation of battery cell assembly and welding can be realized. Description of the Drawings

[0039] Figure 1 It is a structural diagram of the battery cell sampling device provided by an embodiment of the present invention;

[0040] Figure 2 It is a partial exploded view of the battery cell sampling device provided by an embodiment of the present invention;

[0041] Figure 3A It is a structural diagram of the first guiding component adopted by an embodiment of the present invention in one direction;

[0042] Figure 3B Structural diagram of the first guiding component adopted in the embodiment of the present invention in another direction;

[0043] Figure 4A Structural diagram of the second guiding component adopted in the embodiment of the present invention in one direction;

[0044] Figure 4B Exploded view of the second guiding component adopted in the embodiment of the present invention in one direction;

[0045] Figure 4C Exploded view of the second guiding component adopted in the embodiment of the present invention in another direction;

[0046] Figure 4D is Figure 4C Enlarged view of area I in;

[0047] Figure 4E Enlarged view of the position of a hollow part on the second bracket adopted in the embodiment of the present invention;

[0048] Figure 5 Structural diagram of the circuit component adopted in the embodiment of the present invention;

[0049] Figure 6A Assembly diagram of the circuit component and the second guiding component adopted in the embodiment of the present invention;

[0050] Figure 6B Exploded assembly diagram of the circuit component and the second guiding component adopted in the embodiment of the present invention;

[0051] Figure 7A Structural diagram of the ear support component installed with the second conductive part in one direction adopted in the embodiment of the present invention;

[0052] Figure 7B Structural diagram of the ear support component installed with the second conductive part in another direction adopted in the embodiment of the present invention;

[0053] Figure 7C Structural diagram of the second conductive part adopted in the embodiment of the present invention;

[0054] Figure 7D Top view of the cell sampling device provided by the embodiment of the present invention;

[0055] Figure 7E is Figure 7D Enlarged view of area B in;

[0056] Figure 8A Structural diagram of the ear support component installed with the third conductive part in one direction adopted in the embodiment of the present invention;

[0057] Figure 8B Structural diagram of the third conductive member adopted in the embodiment of the present invention;

[0058] Figure 8C Structural diagram of the tab support assembly with the third conductive member installed in another direction in the embodiment of the present invention;

[0059] Figure 8D Structural diagram of the temperature sensor adopted in the embodiment of the present invention;

[0060] Figure 9 Structural diagram of the protective cover adopted in the embodiment of the present invention;

[0061] Figure 10A Process diagram of an installation step of the battery cell sampling device provided in the embodiment of the present invention;

[0062] Figure 10B Process diagram of another installation step of the battery cell sampling device provided in the embodiment of the present invention;

[0063] Figure 10C Process diagram of yet another installation step of the battery cell sampling device provided in the embodiment of the present invention;

[0064] Figure 11 Structural diagram of the battery module of the battery pack provided in the embodiment of the present invention;

[0065] Figure 12 Partial enlarged view of the battery module of the battery pack provided in the embodiment of the present invention. Detailed implementation manners

[0066] To enable those skilled in the art to better understand the technical solutions of the present invention, the battery cell sampling device, battery pack, and battery system provided by the present invention will be described in detail below with reference to the accompanying drawings.

[0067] Please refer to Figure 1 , the embodiment of the present invention provides a battery cell sampling device 200 for detecting specified parameters of a plurality of stacked battery cells 1. The specified parameters may include, for example, voltage, temperature, and the like. In practical applications, one or more specified parameters that can be obtained by electrically conducting with the tabs 1a of the battery cells 1 can be selected according to specific needs, and the embodiment of the present invention has no particular limitation on this. Taking the battery cell 1 as a double-ended battery cell (i.e., the positive tab and the negative tab are respectively located on both sides of the battery cell) as an example, as Figure 1 shown, the battery cell sampling device 200 can be arranged between two adjacent groups of battery cell groups (each battery cell group includes a plurality of stacked battery cells, Figure 1 only the lowest-layer battery cells in two groups of battery cell groups are shown), and is used to detect the specified parameters of a plurality of stacked battery cells 1 by welding with the tabs 1a of two adjacent battery cells 1.

[0068] Please refer to Figures 2 to 4C , the cell sampling device 200 includes a first guiding component 21, a second guiding component 22, a plurality of tab supporting components 3 and a circuit component 4. Among them, the first guiding component 21 has a first sliding rail 212, and the second guiding component 22 has a second sliding rail 222; both ends of each tab supporting component 3 can slide along the first sliding rail 212 and the second sliding rail 222 respectively, and under their guidance, the plurality of tab supporting components 3 can be stacked one by one to form a Figure 2 stacked structure as shown. The second guiding component 22 is configured to be able to fix the tab supporting component 3 when each tab supporting component 3 slides to the stacking position (i.e., Figure 2 the position where the tab supporting components 3 stacked together are located in); the plurality of tab supporting components 3 are used to support the tabs 1a of the plurality of cells 1 one by one at the stacking position, and the tab supporting component 3 is configured to be able to electrically conduct the corresponding tab 1a of the cell 1 with the circuit component 4 at the stacking position, and the circuit component 4 is used to detect the specified parameters of the plurality of cells 1.

[0069] Under the guiding action of the first sliding rail 212 and the second sliding rail 222, the stacking position of the plurality of tab supporting components 3 can be automatically positioned, and in combination with the use of the second guiding component 22 to fix the tab supporting component 3 when each tab supporting component 3 slides to the stacking position, it can play a role in limiting and fixing the tab supporting component 3 and ensure the stability of the stacked structure. At the same time, each tab supporting component 3 is used to support the tab 1a of the corresponding cell 1 to facilitate welding of the two, so that the tab 1a can be electrically conducted with the circuit component 4 by means of the tab supporting component 3, enabling the circuit component 4 to detect the specified parameters (such as voltage and temperature) of the plurality of cells 1.

[0070] The cell sampling device 200 provided by the embodiment of the present invention can be manufactured layer by layer in the way of stacking one tab supporting component 3, stacking one layer of cells 1 and performing welding cycles. Under the guiding action of the first sliding rail 212 and the second sliding rail 222, the above manufacturing process can be completed by a manipulator without manual operation, thereby improving the operation convenience, improving the work efficiency, and realizing the automation of cell assembly and welding.

[0071] In some alternative embodiments, both the first slide rail 212 and the second slide rail 222 include a linear slide rail 212a disposed along the battery cell stacking direction (i.e., the direction Z), and a plurality of inclined slide rails 212b; wherein, the plurality of inclined slide rails 212b are spaced along the battery cell stacking direction (i.e., the direction Z), and one ends of the plurality of inclined slide rails 212b are all communicated with the linear slide rail 212a, and the other ends of the plurality of inclined slide rails 212b extend obliquely relative to the linear slide rail 212a; the tab support assembly 3 can slide into the corresponding inclined slide rail 212b under the guidance of the linear slide rail 212a, and slide to the stacking position under the guidance of the corresponding inclined slide rail 212b. Specifically, taking the battery cell stacking direction as the vertical direction as an example, the plurality of tab support assemblies 3 sequentially descend through the linear slide rail 212a and slide into the corresponding inclined slide rail 212b, and then slide obliquely to the stacking position at the corresponding height under the guidance of the inclined slide rail 212b, so that the plurality of tab support assemblies 3 can be stacked one by one from bottom to top. The upper end of the above-mentioned linear slide rail 212a is open, so that one end of the tab support assembly 3 can enter the linear slide rail 212a, and the end of the above-mentioned inclined slide rail 212b far from the linear slide rail 212a is closed, which can make the tab support assembly 3 slide to the end of the inclined slide rail 212b, playing a role in limiting the tab support assembly 3. Since the above-mentioned inclined slide rail 212b can make the tab support assembly 3 move obliquely relative to the vertical direction, it is convenient to use the second guiding assembly 22 to fix the tab support assembly 3 when each tab support assembly 3 slides to the stacking position. Optionally, the inclined slide rail 212b can be one or a combination of a circular arc slide rail, an inclined linear slide rail, and a broken line slide rail.

[0072] It should be noted that, in actual applications, the tab support assembly can slide along the inclined slide rail to its end far from the linear slide rail, that is, reach the above-mentioned stacking position, or it can also reach the above-mentioned stacking position before sliding to the end of the inclined slide rail far from the linear slide rail, as long as the tab support assembly can be stacked on the previous tab support assembly.

[0073] It should also be noted that the first slide rail 212 and the second slide rail 222 are not limited to the combination of the linear slide rail 212a and the inclined slide rail 212b. In actual applications, only a linear slide rail or any other structure can be used as long as the tab support assembly can be guided to the stacking position at the corresponding height.

[0074] In addition, it should be noted that the battery cell stacking direction can be the vertical direction (i.e., the direction Z), or the horizontal direction or any other direction, and the embodiments of the present invention have no special limitations on this.

[0075] In some alternative embodiments, such as Figures 3A to 4EAs shown, the above-mentioned first guiding component 21 includes a first bracket 211, and the second guiding component 22 includes a second bracket 221; the first bracket 211 and the second bracket 221 are oppositely arranged along the first direction (i.e., the X direction), and are used for fixedly connecting with a battery box body (not shown in the figure); the first direction (i.e., the X direction) is parallel to a plane perpendicular to the battery cell stacking direction (i.e., the Z direction); a first sliding rail 212 and a second sliding rail 222 are respectively arranged on the first bracket 211 and the second bracket 221.

[0076] In some alternative embodiments, a clamping structure is arranged on the second bracket 221, and the clamping structure is used for clamping with the ear support component 3 when the ear support component 3 slides to the stacking position. By adopting the clamping method to fix the ear support component 3, it is beneficial to be completed by a manipulator without manual operation, so that the assembly automation can be realized.

[0077] In some alternative embodiments, as Figure 4A shown, a receiving space 227 with an opening 221c is arranged in the second bracket 221, the opening 221c faces the first bracket 211 in the above-mentioned first direction (i.e., the X direction), both the above-mentioned second sliding rail 222 and the clamping structure are located in the receiving space 227, and one end of the ear support component 3 can slide along the second sliding rail 222 in the receiving space 227 through the opening 221c. By arranging both the second sliding rail 222 and the clamping structure in the receiving space 227, the second bracket 221 can protect the internal components and connection structures thereof, improve the connection stability, and at the same time can also save the occupied space.

[0078] In some alternative embodiments, as Figure 3A and Figure 3B shown, there are two first sliding rails 212, and they are oppositely arranged on both sides of the first bracket 211 along the second direction (i.e., the Y direction), the second direction (i.e., the Y direction) is parallel to a plane perpendicular to the battery cell stacking direction (i.e., the Z direction), and is perpendicular to the above-mentioned first direction (i.e., the X direction); there are two second sliding rails 222, and they are located in the receiving space 227 and are opposite to each other along the second direction (i.e., the Y direction). In this way, the guiding effect of the first sliding rail 212 and the second sliding rail 222 can be further strengthened, and the movement stability of the ear support component 3 can be ensured.

[0079] In some alternative embodiments, both the first bracket 211 and the second bracket 221 include a bracket body and a fixing member. Among them, an installation hole penetrating the bracket body along the battery cell stacking direction (i.e., the Z direction) is arranged on the bracket body, and a bushing is nested in the installation hole; the fixing member passes through the bushing and is used for fixedly connecting with the battery box body. Specifically, as Figure 3A and Figure 3BAs shown, for the first bracket 211, the bracket body can be columnar, and is arranged along the battery cell stacking direction (i.e., the Z direction), and is fixedly connected to the battery box body. There are two first slide rails 212, which are respectively recessed channels formed on two opposite side surfaces of the first bracket 211, and the two first slide rails 212 are symmetrically arranged with respect to the axis of the first bracket 211 in the battery cell stacking direction (i.e., the Z direction). Each first slide rail 212 includes a linear slide rail 212a and a plurality of inclined slide rails 212b communicated therewith. The plurality of inclined slide rails 212b are arranged at equal intervals along the battery cell stacking direction (i.e., the Z direction). And, optionally, the track widths of the linear slide rails 212a are the same, the track widths of the respective inclined slide rails 212b are the same, and are the same as the track width of the linear slide rail 212a. The above-mentioned bushing 213 of the first bracket 211 is hollow cylindrical, and is nested inside the bracket body, and penetrates through the bracket body along the battery cell stacking direction (i.e., the Z direction). By means of the bushing 213, the strength of the bracket body can be improved, thereby improving the assembly stability.

[0080] In some alternative embodiments, as Figure 3A and Figure 3B shown, for the first bracket 211, a first positioning member 214 is further provided on the bracket body. The first positioning member 214 is used to cooperate with a second positioning member on the battery box body to define the relative position between the bracket body and the battery box body. Specifically, the above-mentioned second positioning member is provided with a threaded hole and a positioning hole on the mounting surface of the battery box body. The threaded hole is coaxially arranged with the above-mentioned bushing. The above-mentioned fixing member is a fastening screw. After the fastening screw passes through the bushing 213, it is screwed into the threaded hole, thereby realizing the locking of the bracket body and the battery box body and realizing a rigid connection. When installing the first bracket 211, the above-mentioned first positioning member 214 is inserted into the above-mentioned positioning hole, and the two cooperate to define the relative position between the bracket body and the battery box body, and at the same time, the rotation of the bracket body can be restricted, that is, it plays a role of positioning and anti-rotation.

[0081] As Figures 4A to 4EAs shown, for the second bracket 221, the bracket body can be in the shape of a strip plate, and is arranged along the battery cell stacking direction (i.e., the Z direction), and is fixedly connected to the battery box body. The bracket body of the second bracket 221 has the above-mentioned accommodation space 227. There are two second slide rails 222, which are located in the above-mentioned accommodation space 227 and are opposite to each other along the second direction (i.e., the Y direction). Optionally, for the convenience of assembly, the second bracket (i.e., the bracket body) 221 includes a first split body 221a and a second split body 221b, and the two are butted along the second direction (i.e., the Y direction) to form the above-mentioned accommodation space 227. Optionally, the first split body 221a and the second split body 221b can be fixed together by welding or bonding, etc.; the two second slide rails 222 are respectively arranged on two opposite surfaces of the first split body 221a and the second split body 221b. Optionally, side walls 225 forming the second slide rails 222 are arranged on two opposite surfaces of the first split body 221a and the second split body 221b, and the side walls 225 enclose the second slide rails 222. The two second slide rails 222 are symmetrically arranged with respect to the axis of the second bracket 221 in the battery cell stacking direction (i.e., the Z direction). Each second slide rail 222 includes a linear slide rail 212a and a plurality of inclined slide rails 212b communicated with it, and the plurality of inclined slide rails 212b are arranged at equal intervals along the battery cell stacking direction (i.e., the Z direction). The structures, functions and connection methods with the battery box body of the above-mentioned bushing 223, fixing member and first positioning member 214 arranged on the second bracket 221 are the same as those of the first bracket 211, and will not be elaborated here.

[0082] In some alternative embodiments, such as Figure 4C and Figure 4D As shown, the above-mentioned clamping structure includes a plurality of elastic clamping members 2214; a notch 225a is provided at the position of the side wall 225 corresponding to the inclined slide rail 212b, and the elastic clamping member 2214 is arranged at the notch 225a for clamping the ear support assembly 3 by generating elastic deformation when one end of the ear support assembly 3 slides along the second slide rail 222 past the elastic clamping member 2214.

[0083] In some alternative embodiments, such as Figures 4C to 4EAs shown, one end of the above elastic clamping member 2214 is connected to one end of the above side wall 225 at the notch 225a. The other end of the elastic clamping member 2214 is a free end. When the elastic clamping member 2214 is in its original state, it protrudes obliquely into the sliding rail 212b relative to the inner surface of the side wall 225. And at the position corresponding to the notch 225a on the second bracket 221, a hollow portion 2213 is provided to make the other end of the elastic clamping member 2214 a free end. Optionally, the track widths of the linear sliding rails 212a are the same, and the track widths of other regions of each of the oblique sliding rails 212b except the region where the elastic clamping member 2214 is located are the same and are the same as the track width of the linear sliding rail 212a. Moreover, the track width of the region where the elastic clamping member 2214 is located is smaller than the track widths of other regions. In this way, when one end of the tab support assembly 3 slides along the oblique sliding rail 212b and passes through the elastic clamping member 2214, it will squeeze the elastic clamping member 2214 to cause elastic deformation so that one end of the tab support assembly 3 can pass through. After passing through, the elastic clamping member 2214 will reset, thereby realizing the fixation of the tab support assembly 3.

[0084] Specifically, the above elastic clamping member 2214 can be an extension section 2214a of the above side wall 225. This extension section 2214a is integrally connected to one end of the above side wall 225 at the notch 225a, and the other end is in a free state. And the thickness of this extension section 2214a is greater than the thickness of other regions of the side wall 225, so that the corresponding track width of this extension section 2214a is locally reduced, that is, smaller than the track widths of other regions of the side wall, so that the track width can be changed by generating elastic deformation when one end of the tab support assembly 3 passes through. In addition, the above hollow portion 2213 can make the above extension section 2214a in a free state and reduce the strength of the extension section 2214a to form a structure that can generate elastic deformation.

[0085] In some alternative embodiments, such as Figure 7A and Figure 7BAs shown, one end of the tab support assembly 3 is provided with two first sliding members 32, which can slide along the two first slide rails 212 respectively; the other end of the tab support assembly 3 is provided with two second sliding members 33, which can slide along the two second slide rails 222 respectively. Specifically, each tab support assembly 3 includes a support body 31, one end of which has two first mounting portions 35 arranged opposite to each other along the second direction (i.e., the Y direction), and the two first sliding members 32 are respectively arranged on the opposing surfaces of the two first mounting portions 35. The first sliding members 32 are, for example, cylinders, and the diameter of the cylinders can be equal to or slightly smaller than the track width of the first slide rails 212. The two first mounting portions 35 are arranged opposite to each other on both sides of the first bracket 211 in the second direction (i.e., the Y direction) and respectively opposite to the two first slide rails 212. The two first sliding members 32 can slide into the two first slide rails 212 respectively. The other end of the support body 31 has a second mounting portion 36, and the second mounting portion 36 is respectively provided with two second sliding members 33 on two surfaces facing away from each other in the second direction (i.e., the Y direction). The second sliding member 33 is, for example, a cylinder, and the diameter of the cylinder can be equal to or slightly smaller than the track width of the second slide rail 222. The second mounting portions 36 on the two second sliding members 33 can slide into the two second slide rails 222 respectively. When the second sliding member 33 slides along the oblique slide rail 212b through the above-mentioned elastic clip 2214, the elastic clip 2214 will be squeezed to cause elastic deformation until the second sliding member 33 passes, and the elastic clip 2214 will reset. At this time, the second sliding member 33 will be blocked from returning, thereby achieving the fixation of the second sliding member 33. Optionally, as Figure 4E As shown, the hollow portion 2213 is provided with a positioning recess 2213 a. When the second sliding member 33 passes through the elastic clamping member 2214 , it will slide into the positioning recess 2213 a, thereby defining the terminal position of the sliding path of the second sliding member 33 .

[0086] Optional, such as Figure 7A and Figure 7B As shown, except for the tab support assembly 3 placed at the bottom layer, the support bodies 31 of the remaining tab support assemblies 3 are also provided with baffles 38. The baffles 38 are located above the tabs 1a in the lower layer and between two adjacent battery cells 1. They are used to act as a thermal barrier between the two, preventing the adjacent battery cells 1 from being directly affected when thermal runaway occurs in one battery cell 1, thereby reducing the harm caused by thermal runaway and slowing the development of thermal runaway. The support body 31 of the tab support assembly 3 placed at the bottom layer is not provided with the above-mentioned baffles 38 because it needs to be installed on the battery case.

[0087] In some optional embodiments, such as Figures 5 to 6BAs shown, the circuit component 4 includes a fixed plate 41, a flexible plate 42, and an external socket 43. Among them, the fixed plate 41 is disposed in the accommodation space 227, and the fixed plate 41 has a first plate surface and a second plate surface facing away from each other. Among them, the first plate surface faces the opening 221c of the accommodation space 227; as Figure 4C shown, the second plate surface is attached to one side plate 2211 of the second split body 221b. A part of the flexible plate 42 is attached to the second plate surface, and one end 42a of the flexible plate 42 extends to the outside of the accommodation space 227 and is connected to the external socket 43; a circuit (not shown in the figure) for detecting specified parameters of a plurality of battery cells 1 is integrated on the flexible plate 42, and this circuit transmits electrical signals through the external socket 43; on the fixed plate 41 and on one side of the first plate surface, a plurality of first conductive members 44 are further provided, and each first conductive member 44 is electrically connected to the circuit, and when the corresponding ear support assembly 3 slides to the stacking position, it is inserted into the ear support assembly 3 to be electrically connected to the ear 1a of the corresponding battery cell 1 through the ear support assembly 3. Specifically, the above-mentioned circuit includes electronic components and circuits for realizing the detection of specified parameters of a plurality of battery cells 1, and this circuit is integrated in the flexible plate 42. A part of the flexible plate 42 is attached to the fixed plate 41, and the fixed plate 41 is used to improve the overall strength of the circuit component 4 so as to be fixed in the accommodation space 227. When the corresponding ear support assembly 3 slides to the stacking position, the above-mentioned first conductive member 44 is inserted into the ear support assembly 3, and is used to electrically conduct the battery cell ear in electrical contact with the ear support assembly 3 to the circuit, so that the circuit can collect the specified parameters (such as voltage) of the battery cell ear. The above-mentioned external socket 43 is, for example, a socket, which is installed at one end of the flexible plate 42 extending to the outside of the accommodation space 227 and is used for externally transmitting electrical signals to realize the output of the detected data.

[0088] In some alternative embodiments, as Figure 5 shown, the above-mentioned first conductive member 44 is an elastic member having a socket 44a; as Figures 7A to 7C shown, a second conductive member 37 is provided on the support body 31 of at least one ear support assembly 3, and the second conductive member 37 is used to be in electrical contact with the ear 1a of the corresponding battery cell 1 when the ear support assembly 3 slides to the stacking position. Taking the battery cell 1 as a double-ended battery cell (that is, the positive electrode ear and the negative electrode ear are respectively located on both sides of the battery cell) as an example, in the same layer, the ears 1a of two adjacent battery cells 1 are sequentially stacked on the upper surface of the second conductive member 37, and the ears 1a of the two battery cells 1 are electrically conducted to the second conductive member 37 by welding.

[0089] One end of the second conductive member 37 is provided with a first insertion portion 371, as Figure 7EAs shown, when the first plugging portion 371 slides the ear support assembly 3 to the stacking position, it can be inserted into the socket 44a of the corresponding elastic member and be in electrical contact with the elastic member. Optionally, both the second conductive member 37 and the first plugging portion 371 are in sheet form, and they can be integrally formed or welded together. The second conductive member 37 is flatly arranged on the support body 31 of the ear support assembly 3 and protrudes relative to the upper surface of the support body 31 to facilitate electrical contact with the cell ear. The first plugging portion 371 extends from one end of the support body 31, and the farther it is from the support body 31, the narrower its width is, so as to facilitate insertion into the socket 44a of the elastic member.

[0090] In this way, the ear 1a of the cell 1 can be electrically connected to the above circuit in sequence through the second conductive member 37, the first plugging portion 371 thereon, and the elastic member. Optionally, the elastic member may include two symmetrically arranged elastic sheets, and the two elastic sheets are bent to form a structure similar to a double "V" shape. For the convenience of installation, the sizes of the two "V" shapes are different. Specifically, pins are provided at one end of the two elastic sheets close to the fixing plate 41. The pins pass through the fixing plate 41 and the flexible plate 42 along the thickness direction of the fixing plate 41 and are welded to the flexible plate 42 on the side where the flexible plate 42 is located to fix the elastic sheet on the fixing plate 41. At the same time, the part of the elastic sheet located in the flexible plate 42 is electrically connected to the circuit located in the flexible plate 42.

[0091] The fixing plate 41, a part of the flexible plate 42, and the first conductive member 44 in the above circuit assembly 4 are all assembled in the accommodation space 227 of the second bracket 221. In this way, the second bracket 221 can play a certain role in fixing and limiting these components. Optionally, as Figure 4C shown, on the second bracket 221 and located in the accommodation space 227, a plurality of insulating partitions 228 are also provided. The plurality of insulating partitions 228 are located on the side opposite to the opening 221c of the accommodation space 227 and are spaced along the cell stacking direction (i.e., the Z direction); an insulating partition 228 is provided between every two adjacent first conductive members 44. By separating two adjacent first conductive members 44 with the insulating partition 228, electrical insulation can be achieved between the two, and at the same time, a certain limiting effect can be exerted on the first conductive member 44. Optionally, the insulating partition 228 is integrally connected to the second split body 221b, and a plurality of sockets 2212 spaced along the cell stacking direction (i.e., the Z direction) are provided on the first split body 221a. When the first split body 221a and the second split body 221b are butted, the plurality of insulating partitions 228 are inserted into the plurality of sockets 2212 one by one to improve the structural stability of the insulating partition 228.

[0092] In some alternative embodiments, when it is necessary to detect the voltage of the battery cell, the second conductive member 37 may be disposed on the support body 31 of at least one tab support assembly 3. The tab 1a of the battery cell 1 may be electrically connected to the above-mentioned circuit in sequence through the second conductive member 37, the first insertion portion 371 thereon, and the elastic member, so that the circuit can collect the voltage signal of the battery cell tab. In practical applications, it may be set according to needs to dispose the second conductive member 37 on the support bodies 31 of all or a part of the tab support assemblies 3. If it is also necessary to detect the battery cell temperature, the second conductive member 37 may be disposed on the support bodies 31 of a part of the tab support assemblies 3. As Figures 8A to 8D shown, a third conductive member 39, a temperature sensor 5 and two connectors (391b, 391c) are disposed on the support body 31' of another part of the tab support assembly 3'. The temperature sensor 5 can detect the voltage and temperature of the battery cell tab through the third conductive member 39. Specifically, the third conductive member 39 is configured to be in electrical contact with the corresponding tab 1a of the battery cell 1 when the tab support assembly 3 slides to the stacking position; a second insertion portion 391a is disposed at one end of the third conductive member 39, and the second insertion portion 391a and the two connectors (391b, 391c) can be inserted into the sockets 44a of the corresponding three elastic members when the tab support assembly 3 slides to the stacking position, and are respectively in electrical contact with the three elastic members. Optionally, the third conductive member 39, the second insertion portion 391a and the two connectors (391b, 391c) are all in sheet form, and the third conductive member 39 may be integrally connected or welded to the second insertion portion 391a to achieve electrical connection, and electrical insulation is provided between the second insertion portion 391a and the two connectors (391b, 391c). The third conductive member 39 is disposed flat on the support body 31' of the tab support assembly 3' and protrudes relative to the upper surface of the support body 31' to facilitate electrical contact with the battery cell tab. The second insertion portion extends from one end of the support body 31', and the width thereof becomes narrower as it is farther away from the support body 31' to facilitate insertion into the socket 44a of the above-mentioned elastic member.

[0093] As Figure 8C and Figure 8DAs shown, the detection end of the temperature sensor 5 is in contact with the third conductive member 39, and is used to indirectly obtain the temperature of the electrode tab of the battery cell by detecting the temperature of the third conductive member 39; the second plugging portion 391a is electrically connected to the third conductive member 39, so as to be electrically conductive with the electrode tab of the battery cell through the third conductive member 39. In this way, the electrode tab 1a of the battery cell 1 can be electrically connected to the above circuit in sequence through the third conductive member 39, the second plugging portion 391a thereon, and the elastic member. The two electrode ends of the temperature sensor 5 are respectively electrically connected to two plugging members (391b, 391c). The two plugging members (391b, 391c) are fixed to the third conductive member 39 and are electrically insulated from the third conductive member 39. The third conductive member 39 is used to electrically connect the two electrode ends of the temperature sensor 5 to the circuit, so that the circuit can supply power to the temperature sensor 5 and receive the temperature signal fed back by the temperature sensor 5.

[0094] In some alternative embodiments, as Figures 8A to 8D shown, the above two plugging members (391b, 391c) both have pads 312 provided on the support body 31'; the two electrode ends of the temperature sensor 5 both have solder tabs 52, and the solder tabs 52 are welded to the pads 312. Specifically, as Figure 8D shown, the above temperature sensor 5 is composed of, for example, a thermistor 51, two metal sheets respectively connected to both ends thereof, and an insulating layer 53 wrapped outside these components. The two metal sheets are smaller in size at one end close to the thermistor 51 and larger in size at one end far from the thermistor 51, forming the above two solder tabs 52. The temperature sensor 5 can be assembled with the support body 31' of the electrode tab support assembly 3' before assembling the battery cell. During assembly, the detection end of the temperature sensor 5 (i.e., the end where the thermistor 51 is located) is attached to the surface of the third conductive member 39 and can be fixed using thermal conductive silicone grease. The two solder tabs 52 are respectively attached to and welded to the two pads 312 on the support body 31', thereby realizing the assembly of the temperature sensor 5.

[0095] In some alternative embodiments, as Figure 9As shown, the cell sampling device 200 further includes a protective cover 6. The protective cover 6 is disposed on the first guiding component 21, the second guiding component 22, and the stacked plurality of ear support components 3, and is clamped to the adjacent ear support component 3 and the second guiding component 22. Specifically, the protective cover 6 includes a strip-shaped cover plate 61. A plurality of first buckles 62 are provided on the strip-shaped cover plate 61, and a plurality of second buckles 311 are provided at corresponding positions on the first bracket 211, the second bracket 221, and each ear support component 3 (or 3'). By correspondingly buckling the plurality of first buckles 62 with the plurality of second buckles 311 one by one, the strip-shaped cover plate 61 is clamped to the first bracket 211, the second bracket 221, and the adjacent ear support component 3 (or 3'). Optionally, the plurality of second buckles 311 may be card slots, and are respectively disposed on two sides of the first bracket 211, the second bracket 221, and each ear support component 3 in the second direction (i.e., the Y direction); the plurality of first buckles 62 may be disposed on the surface of the strip-shaped cover plate 61 opposite to the first bracket 211, the second bracket 221, and each ear support component 3 (or 3'), and are arranged in two rows along two sides in the second direction (i.e., the Y direction), and the two rows of first buckles 62 may be respectively buckled with the corresponding second buckles 311. Additionally, optionally, at least one limiting protrusion 63 is provided on the surface of the protective cover 6 adjacent to the ear support component 3 (or 3'), and the limiting protrusion 63 abuts against the ear 1a of the cell 1 on the adjacent ear support component 3. Optionally, limiting plates 611 are further provided on two sides of the strip-shaped cover plate 61 along the second direction (i.e., the Y direction), and the limiting plates 611 are attached to two sides of the first bracket 211, the second bracket 221, and each ear support component 3 in the second direction (i.e., the Y direction) to limit the position of the strip-shaped cover plate 61.

[0096] With the aid of the above protective cover 6, metal components such as the ear 1a can be protected, mainly for insulation, dust prevention, and anti-touch protection. Preferably, by making the limiting protrusion 63 abut against the ear of the cell on the adjacent ear support component 3, the jumping of the ear and the ear support component can be avoided, playing a certain role in fixing and limiting.

[0097] In practical applications, such as Figure 1As shown, for example, the above-mentioned first guiding component 21, second guiding component 22, multiple tab support components 3 and protective cover 6 can be installed at the tab connection position between two adjacent groups of battery cell groups (each battery cell group is composed of multiple stacked battery cells 1). After these components are assembled with the multiple battery cells, the combined structure formed by the above-mentioned first guiding component 21, second guiding component 22, multiple tab support components 3 and protective cover 6 can form a fire wall at the above-mentioned tab connection position. The above-mentioned fire wall can well block or delay the diffusion of high-temperature flames and gases. Thus, when one or more battery cells in the battery cell group undergo thermal runaway, the above-mentioned fire wall can play a role in thermal blocking, preventing the directly adjacent other battery cell group from being affected, thereby reducing the harm caused by thermal runaway and delaying the development speed of thermal runaway. Optionally, flame-retardant and high-temperature-resistant materials such as high-temperature plastics, high-temperature-resistant metals, mica sheets, etc. can be attached to the surface of the whole or part of the above-mentioned combined structure; or, the above-mentioned materials can also be added to the inside of the above-mentioned combined structure.

[0098] When assembling the battery cells, as Figures 10A to 10C shown, first, as Figure 10A shown, install the above-mentioned first bracket 211, second bracket 221 and circuit component 4 in the battery box 12; then, layer by layer install the tab support component 3 and battery cell 1, and according to the need of the temperature sampling point position, select to install the tab support component 3 with the above-mentioned second conductive part 37 or the tab support component 3' with the above-mentioned third conductive part 39. When installing each tab support component, as Figure 10B shown, the first sliding part 32 and the second sliding part 33 at both ends of the tab support component respectively enter the linear slide rail 212a in the first slide rail 212 and the second slide rail 222, and the first sliding part 32 and the second sliding part 33 at both ends of the tab support component both slide into the inclined slide rail 212b at the corresponding height until reaching the corresponding stacking position, as Figure 10C shown in the position, at this time the second sliding part 33 slides along the inclined slide rail 212b past the elastic clamping part 2214, and the elastic clamping part 2214 can prevent the second sliding part 33 from retreating, thereby realizing the fixation of the second sliding part 33. At the same time, the first insertion part 371 on the above-mentioned second conductive part 37 or each second insertion part 391a on the third conductive part 39 is inserted into the socket 44a of the corresponding elastic part.

[0099] In summary, the cell sampling device provided by the embodiment of the present invention enables both ends of each tab support assembly to slide along the first slide rail of the first guiding assembly and the second slide rail of the second guiding assembly. Under the guidance of the two, multiple tab support assemblies can be stacked one by one. When each tab support assembly slides to the stacking position, the second guiding assembly is used to fix the tab support assembly to ensure the stability of the stacking structure. At the same time, each tab support assembly is used to support the corresponding cell tab, facilitating welding of the two, so as to electrically connect the tab to the circuit assembly, enabling the circuit assembly to detect specified parameters (such as voltage and temperature) of multiple cells.

[0100] The cell sampling device provided by the embodiment of the present invention can be manufactured layer by layer in the way of stacking one tab support assembly, stacking one layer of cells, and performing welding cycles. Under the guiding action of the first slide rail and the second slide rail, the above manufacturing process can be completed by a manipulator without manual operation, thereby improving the operation convenience, enhancing the work efficiency, and realizing the automation of cell assembly and welding.

[0101] As another technical solution, please refer to Figure 11 and Figure 12 , the embodiment of the present invention also provides a battery pack, which includes a battery box body (not shown in the figure) and a cell stack disposed in the battery box body. The cell stack includes at least one cell group 100, and the cell group 100 includes multiple stacked cells. Moreover, it further includes the above-mentioned cell sampling device 200 provided by the embodiment of the present invention, and the cell sampling device 200 is disposed in the battery box body.

[0102] In some optional embodiments, taking the cell as a double-ended cell (i.e., the positive tab and the negative tab are respectively located on both sides of the cell) as an example, multiple cell groups 100 are connected end to end to form a cell stack. After assembly, the cell stack and the above-mentioned cell sampling device 200 constitute a battery module, and the battery module is located between two parallel liquid cooling plates 300 in the battery box body. Of course, in actual applications, the above-mentioned cell group 100 can also be one group, or the above-mentioned cell can also be a single-ended cell. The above-mentioned cell sampling device provided by the embodiment of the present invention is applicable.

[0103] The battery pack provided by the embodiment of the present invention can improve the operation convenience, enhance the work efficiency, and realize the automation of cell assembly and welding by adopting the above-mentioned cell sampling device provided by the embodiment of the present invention.

[0104] As another technical solution, the embodiment of the present invention also provides a battery system, which includes the above-mentioned battery pack provided by the embodiment of the present invention and a battery management module for regulating the battery pack.

[0105] The battery system provided by the present invention can improve the operation convenience, enhance the working efficiency and realize the automation of battery cell assembly and welding by adopting the above-mentioned battery pack provided by the embodiments of the present invention.

[0106] It can be understood that the above embodiments are merely exemplary embodiments adopted to illustrate the principle of the present invention. However, the present invention is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also regarded as the protection scope of the present invention.

Claims

1. A battery cell sampling device for detecting specified parameters of a plurality of stacked battery cells, characterized in that, It includes a first guiding component, a second guiding component, a plurality of tab supporting components, and a circuit component. Among them, the first guiding component has a first sliding rail, and the second guiding component has a second sliding rail; both ends of each of the tab supporting components can slide along the first sliding rail and the second sliding rail respectively, and can be guided by the two to stack the plurality of tab supporting components one by one; the second guiding component is configured to fix the tab supporting component when each of the tab supporting components slides to the stacking position; the plurality of tab supporting components are used to support the tabs of the plurality of battery cells one by one at the stacking position, and the tab supporting components are configured to electrically connect the corresponding tabs of the battery cells with the circuit component at the stacking position, and the circuit component is used to detect specified parameters of the plurality of battery cells.

2. The cell sampling device according to claim 1, wherein Both the first sliding rail and the second sliding rail include a linear sliding rail arranged along the battery cell stacking direction, and a plurality of inclined sliding rails; among them, the plurality of inclined sliding rails are arranged at intervals along the battery cell stacking direction, and one ends of the plurality of inclined sliding rails are all communicated with the linear sliding rail, and the other ends of the plurality of inclined sliding rails extend obliquely relative to the linear sliding rail; The tab supporting component can slide into the corresponding inclined sliding rail under the guidance of the linear sliding rail, and slide to the stacking position under the guidance of the corresponding inclined sliding rail.

3. The cell sampling device according to claim 2, characterized in that The first guiding component includes a first bracket, and the second guiding component includes a second bracket; the first bracket and the second bracket are arranged opposite to each other along a first direction, and are used for fixedly connecting with the battery box body; the first direction is parallel to the plane perpendicular to the battery cell stacking direction; The first sliding rail and the second sliding rail are respectively arranged on the first bracket and the second bracket.

4. The cell sampling device according to claim 3, wherein A clamping structure is arranged on the second bracket, and the clamping structure is used to clamp with the tab supporting component when the tab supporting component slides to the stacking position.

5. The cell sampling device according to claim 4, wherein, An accommodating space with an opening is arranged in the second bracket, and both the second sliding rail and the clamping structure are located in the accommodating space; one end of the tab supporting component can slide along the second sliding rail in the accommodating space through the opening.

6. The cell sampling device according to claim 5, characterized in that, The clamping structure includes a plurality of elastic clamping pieces; On the inner surface of the second bracket located in the accommodating space, there are side walls forming the second sliding rail, and there are notches at the positions corresponding to the inclined sliding rails of the side walls. The elastic clamping pieces are arranged at the notches, and are used to clamp the tab supporting component by generating elastic deformation when one end of the tab supporting component slides along the second sliding rail past the elastic clamping pieces.

7. The cell sampling device according to claim 6, wherein, One end of the elastic clamping piece is connected to one end of the side wall at the notch, and the other end of the elastic clamping piece is a free end. When the elastic clamping piece is in the original state, it protrudes into the inclined sliding rail relative to the inner surface of the side wall, and a hollowed-out part is arranged at the position corresponding to the notch on the second bracket to make the other end of the elastic clamping piece a free end.

8. The cell sampling device according to claim 5, wherein There are two first slide rails, which are oppositely arranged on both sides of the first bracket along the second direction. The second direction is parallel to the plane perpendicular to the cell stacking direction and perpendicular to the first direction. There are two second slide rails, which are located in the accommodating space and are opposite to each other along the second direction. Two first sliding members are provided at one end of the ear support assembly. The two first sliding members can slide along the two first slide rails respectively. Two second sliding members are provided at the other end of the ear support assembly. The two second sliding members slide along the two second slide rails respectively.

9. The cell sampling device according to claim 8, wherein The second bracket includes a first part and a second part, which are butted along the second direction to form the accommodating space. The two second slide rails are respectively arranged on two opposite surfaces of the first part and the second part.

10. The cell sampling device according to claim 3, wherein, Both the first bracket and the second bracket include a bracket body and a fixing member. Among them, an installation hole penetrating the bracket body along the cell stacking direction is provided on the bracket body, and a bushing is nested in the installation hole. The fixing member passes through the bushing and is used for fixedly connecting with the battery box body.

11. The cell sampling device according to claim 10, characterized in that, A first positioning member is further provided on the bracket body. The first positioning member is used for cooperating with a second positioning member on the battery box body to define the relative position between the bracket body and the battery box body.

12. The cell sampling device according to claim 5, wherein, The circuit assembly includes a fixing plate, a flexible board and an external socket. Among them, the fixing plate is arranged in the accommodating space, and the fixing plate has a first board surface and a second board surface facing away from each other. The first board surface faces the opening of the accommodating space. A part of the flexible board is attached to the second board surface, and one end of the flexible board extends to the outside of the accommodating space and is connected to the external socket. A circuit for detecting specified parameters of multiple cells is integrated on the flexible board, and the circuit transmits electrical signals through the external socket. On the fixing plate, and on one side of the first board surface, a plurality of first conductive members are further provided. Each first conductive member is electrically connected to the circuit, and when the corresponding ear support assembly slides to the stacking position, it is inserted into the ear support assembly to be electrically connected to the ear of the corresponding cell through the ear support assembly.

13. The cell sampling device according to claim 12, wherein The first conductive member is an elastic member with a socket. Each ear support assembly includes a support body. A second conductive member is provided on the support body of at least one ear support assembly. The second conductive member is used for being electrically contacted with the ear of the corresponding cell when the ear support assembly slides to the stacking position. A first insertion part is provided at one end of the second conductive member. The first insertion part can be inserted into the socket of the corresponding elastic member and be electrically contacted with the elastic member when the ear support assembly slides to the stacking position.

14. The cell sampling device according to claim 13, characterized in that, On the support body of at least one of the tab support assemblies, a third conductive member, a temperature sensor, and two plug connectors are provided. The third conductive member is configured to be in electrical contact with the tab of the corresponding battery cell when the tab support assembly slides to the stacking position; one end of the third conductive member is provided with a second plug portion. The second plug portion and the two plug connectors are arranged at intervals in sequence along the battery cell stacking direction, and can be inserted into the sockets of the corresponding three elastic members and be in electrical contact with the three elastic members respectively when the tab support assembly slides to the stacking position. The detection end of the temperature sensor is in contact with the third conductive member, and the second plug portion is electrically connected to the third conductive member; the two electrode ends of the temperature sensor are electrically connected to the two plug connectors respectively. The two plug connectors are fixed to the third conductive member and are electrically insulated from the third conductive member.

15. The cell sampling device according to claim 14, wherein, The other two second plug portions each have pads provided on the support body; the two electrode ends of the temperature sensor each have welding tabs, and the welding tabs are welded to the pads.

16. The cell sampling device according to claim 12, characterized in that, On the second bracket and in the accommodation space, a plurality of insulating partitions are further provided. The plurality of insulating partitions are located on the opposite side of the opening of the accommodation space and are arranged at intervals along the battery cell stacking direction; one insulating partition is provided between every two adjacent first conductive members.

17. The cell sampling device according to claim 1, wherein The battery cell sampling device further includes a protective cover, which covers the first guiding assembly, the second guiding assembly, and the stacked plurality of tab support assemblies, and is clamped with the adjacent tab support assembly and the second guiding assembly.

18. The battery cell sampling device according to claim 17, wherein, At least one limiting protrusion is provided on the surface of the protective cover adjacent to the tab support assembly, and the limiting protrusion abuts against the tab of the battery cell on the adjacent tab support assembly.

19. A battery pack, comprising a battery box body and a battery cell stack disposed in the battery box body, the battery cell stack including at least one battery cell group, the battery cell group including a plurality of stacked battery cells; characterized in that, It further includes the battery cell sampling device according to any one of claims 1-18, and the battery cell sampling device is arranged in the battery box.

20. A battery system, characterized in that, It includes the battery pack according to claim 19 and a battery management module for regulating the battery pack.

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