Energy storage device

Abstract

The invention belongs to the technical field of energy storage, and relates to an energy storage device, which comprises a battery pack comprising a plurality of battery cells arranged in sequence along a first direction; the signal acquisition assembly comprises a circuit board, a plurality of connecting bars and a plurality of conductive pieces, the circuit board is located on one side of the connecting bars in the second direction, the second direction is perpendicular to the first direction, the connecting bars are connected with the pole columns of the two adjacent battery cells, the first ends of the conductive pieces are connected to the connecting bars, and the second ends of the conductive pieces are connected to the circuit board; wherein the conductive piece is movably connected with the connecting bar and / or the circuit board. The conductive part is movably connected with at least one of the connecting bar or the circuit board, and the movable connection can adapt to the expansion deformation or displacement change of the battery cells in one or more directions, so that the electrical connection between the conductive part and the connecting bar is prevented from being disconnected, or the electrical connection between the conductive part and the circuit board is prevented from being disconnected.

Description

Technical Field

[0001] The present application relates to the field of energy storage technology, and in particular to an energy storage device. Background Art

[0002] Battery energy storage module is a key technology in the field of new energy. In the prior art, battery energy storage module is usually implemented by battery pack. Battery pack usually includes several battery modules. The battery module can be composed of a frame structure and several batteries arranged in the frame structure. The BMS system of the battery pack collects the voltage and temperature of each battery in the battery module through the signal acquisition component. The signal acquisition component usually includes an aluminum bar, a circuit board, and a nickel sheet connecting the aluminum bar and the circuit board. After the aluminum bar and the poles of the adjacent battery cells are welded, the voltage and temperature information of the poles of the battery cells can be transmitted to the circuit board through the aluminum bar and the nickel sheet, thereby completing the sampling of the voltage information of the poles of the battery cells by the external circuit.

[0003] During the recycling process of the battery pack, the volume will expand due to the charge and discharge cycle and the change of ambient temperature (for example, the expansion force of lithium-ion battery can reach 5%-10%), which can easily lead to stress concentration in the battery module structure, causing the nickel connecting sheet to break or poor interface contact. Summary of the invention

[0004] Based on this, it is necessary to provide an energy storage device to address the potential safety hazards in signal acquisition circuits.

[0005] An energy storage device comprises: a battery pack, comprising a plurality of battery cells arranged in sequence along a first direction; a signal acquisition component, the signal acquisition component comprising a circuit board, a plurality of connection rows and a plurality of conductive members, the circuit board being located on one side of the connection row in a second direction, the second direction being perpendicular to the first direction, the connection row connecting poles of two adjacent battery cells, a first end of the conductive member being connected to the connection row, and a second end of the conductive member being connected to the circuit board, wherein the conductive member is movably connected to the connection row and / or the circuit board.

[0006] In some embodiments, the first end of the conductive member is slidably connected to the connection row in the first direction and / or the second direction, and the second end of the conductive member is fixed to the circuit board.

[0007] In some embodiments, an elastic portion is provided on a side of the circuit board, and the second end of the conductive member is fixed to the elastic portion.

[0008] In some embodiments, the connecting row is provided with a guide groove, the first end of the conductive member is provided with a sliding block, the sliding block is arranged in the guide groove, the size of the guide groove in the first direction is larger than the size of the sliding block in the first direction, and / or the size of the guide groove in the second direction is larger than the size of the sliding block in the second direction.

[0009] In some embodiments, a guide rail is provided in the guide groove, and a first gap and a second gap are respectively provided between the two sides of the guide rail and the groove wall of the guide groove; the sliding block includes a first hook and a second hook respectively connected to the two sides of the lower surface of the first end, the first hook is inserted into the first gap and hooks the guide rail, and the first hook is inserted into the second gap and hooks the guide rail.

[0010] In some embodiments, the guide rail is a flexible member, or a buffer layer is provided between the guide rail and the first hook portion, or a buffer layer is provided between the guide rail and the second hook portion.

[0011] In some embodiments, the first hook and the second hook are spaced apart and form a guide channel in a third direction with the lower surface of the first end, the guide channel and the guide rail are relatively slidably matched in the first direction and the second direction, and the third direction is perpendicular to both the first direction and the second direction.

[0012] In some embodiments, the guide groove passes through the edge of the connection row in the second direction.

[0013] In some embodiments, the conductive member is made of nickel, the connecting bar is made of aluminum, and a conductive layer is disposed on the surface of the connecting bar at the periphery of the guide groove.

[0014] In some embodiments, the first end of the conductive member is rotated on the connecting row.

[0015] In some embodiments, a connecting hole is provided on the connecting row, and a pin shaft portion is connected to the second end of the conductive member; the pin shaft portion and the connecting hole can cooperate to move relatively in a third direction, the third direction is perpendicular to the first direction and the second direction, and the pin shaft portion and the connecting hole are configured to be able to swing relative to each other.

[0016] In some embodiments, a connecting hole is opened on the connecting row, the first end of the conductive member is connected to a pin shaft portion, a baffle is provided at the end of the pin shaft portion, the pin shaft portion is passed through the connecting hole, and the baffle and the first end are located on both sides of the connecting row.

[0017] In some embodiments, the first end of the conductive member is movably connected to a fixing portion, and the fixing portion is fixed to the connection row.

[0018] In some embodiments, the first end of the conductive member is connected to the fixing portion via a spring.

[0019] In some embodiments, the conductive member has an arched portion between the first end and the second end, an elastic member is disposed in the receiving groove formed by the arched portion, and both ends of the elastic member are respectively connected to the groove wall of the receiving groove in the second direction.

[0020] In the above energy storage device, the conductive member and at least one of the connecting row or the circuit board are configured to be movably connected, and the movable connection can adapt to the expansion deformation or displacement change of the battery cell in one or more directions, thereby avoiding disconnection of the electrical connection between the conductive member and the connecting row, or avoiding disconnection of the electrical connection between the conductive member and the circuit board. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Schematic diagram of the structure of the energy storage device according to an embodiment of the present application.

[0022] Figure 2 This is a schematic diagram of the structure when the energy storage device of an embodiment of the present application is placed on a bottom plate.

[0023] Figure 3 This is a schematic diagram of the structure of the energy storage device after the module cover is installed in an embodiment of the present application.

[0024] Figure 4 This is a schematic diagram of the partial structure of the signal acquisition circuit of Example 1 of the present application.

[0025] Figure 5 This is a schematic diagram of the structure of the conductive part in the signal acquisition circuit of the first embodiment of the present application.

[0026] Figure 6 This is a schematic diagram of the structure of the connection row in the signal acquisition circuit of Example 1 of the present application.

[0027] Figure 7 This is a schematic diagram of the partial structure of the signal acquisition circuit of the second embodiment of the present application.

[0028] Figure 8 This is a schematic diagram of the structure of the conductive part in the signal acquisition circuit of the second embodiment of the present application.

[0029] Fig. 9 This is a schematic diagram of the structure of the connection row in the signal acquisition circuit of the second embodiment of the present application.

[0030] Fig.10 This is a schematic diagram of the partial structure of the signal acquisition circuit of Example 3 of the present application.

[0031] Fig.11 This is a schematic diagram of the structure of the conductive part in the signal acquisition circuit of Example 3 of the present application.

[0032] Fig.12 This is a schematic diagram of the structure of the connection row in the signal acquisition circuit of Example 3 of the present application.

[0033] Fig.13 This is a schematic diagram of the local structure of the conductive component in the signal acquisition circuit of the fourth embodiment of the present application.

[0034] Fig.14 This is a schematic diagram of the local structure of the conductive component in the signal acquisition circuit of Example 5 of the present application.

[0035] Fig.15 This is a schematic diagram of the partial structure of the signal acquisition circuit of Example 6 of the present application.

[0036] Fig.16 This is a schematic diagram of the structure of the conductive parts in the signal acquisition circuit of Example 6 of the present application.

[0037] Fig.17 This is a schematic diagram of the structure of the conductive parts in the signal acquisition circuit of Example 7 of the present application.

[0038] Reference numerals:

[0039] 100, energy storage device; 10, battery pack; 110, battery cell; 112, pole; 20, signal acquisition component; 210, circuit board; 211, elastic part; 220, connection row; 221, through hole; 222, guide groove; 2221, first gap; 2222, second gap; 223, guide rail; 224, connection hole; 230, conductive member; 231, first end; 2311, pin shaft; 2312 , blocking piece; 232, second end; 233, sliding block; 2331, first hook; 2332, second hook; 234, elastic element; 235, fixing portion; 236, spring; 237, arched portion; 2371, accommodating groove; 2372, first side wall; 2373, second side wall; 2374, top wall; 238, elastic member; 30, end plate; 40, steel belt; 50, bottom plate; 60, module cover. DETAILED DESCRIPTION

[0040] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0041] In the description of the present application, it should be understood that if the 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. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0042] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0043] See also Figures 1 to 4 The present application proposes an energy storage device 100 , including a battery pack 10 and a signal acquisition component 20 .

[0044] The battery pack 10 includes a plurality of battery cells 110 arranged in sequence along a first direction X. The signal acquisition component 20 includes a circuit board 210, a plurality of connection bars 220, and a plurality of conductive members 230. The circuit board 210 is located on one side of the connection bar 220 in a second direction Y, and the second direction Y is perpendicular to the first direction X. The connection bar 220 connects the poles 112 of two adjacent battery cells 110, the first end 231 of the conductive member 230 is connected to the connection bar 220, and the second end 232 of the conductive member 230 is connected to the circuit board 210, wherein the conductive member 230 is movably connected to the connection bar 220 and / or the circuit board 210.

[0045] In the present application, the energy storage device 100 is further provided with end plates 30 on both sides of the battery pack 10 in the first direction X. The two end plates 30 fix the multiple battery cells 110 in the middle. A BMS system can be placed on the end plate 30. The BMS system can collect information such as voltage and temperature of each battery cell 110 through the signal acquisition component 20. Further, the multiple battery packs 10 can be fixed by a steel belt 40. The steel belt 40 surrounds the multiple battery cells 110.

[0046] Furthermore, the energy storage device 100 of the present application may further include a bottom plate 50. The bottom plate 50 is disposed below the battery pack 10. Furthermore, multiple battery packs 10 may be placed on one bottom plate 50 at the same time. Furthermore, the energy storage device 100 may further include a module cover 60, which is disposed above the signal acquisition component 20 and covers multiple battery packs 10.

[0047] In the present application, the first direction X is specifically set as the length direction of the energy storage device 100, the second direction Y is the width direction of the energy storage device 100, and the third direction Z is the width direction of the energy storage device 100. Among them, multiple battery cells 110 are stacked and arranged in their thickness direction, the thickness direction of the battery cell 110 is along the first direction X, and the length direction of the battery cell 110 is along the second direction Y. The height direction of the battery cell 110 is consistent with the height direction of the energy storage device 100, and both are along the third direction Z.

[0048] The battery cell 110 is specifically a secondary battery, and can be a pouch-type secondary battery, a square secondary battery, or a cylindrical secondary battery. The battery cell 110 is filled with an electrolyte, which contains electrolytes and is a carrier for ion transmission in the battery. It is generally composed of lithium salts and organic solvents. During the charging and discharging process of the lithium battery, lithium ions move back and forth between the positive electrode and the negative electrode. The electrolyte is the medium for the back and forth migration and transmission of lithium ions, which generates a potential difference between the positive and negative electrodes of the battery, thereby generating current, and thus enabling the battery to work normally.

[0049] The signal acquisition assembly 20 is used to connect the battery cell 110 with the BMS system so that the BMS system can collect information such as voltage and temperature of each battery cell 110. The signal acquisition assembly 20 includes a circuit board 210, a plurality of connection bars 220, and a plurality of conductive members 230. Each connection bar 220 is used to connect the poles 112 of two adjacent battery cells 110 in a first direction X. The connection bar 220 is provided with a through hole 221 (see Figure 4 ). After the through hole 221 is matched with the pole 112, it is welded and connected. A plurality of conductive members 230 respectively connect a connection row 220 with the circuit board 210.

[0050] As described in the background technology, during the recycling of the battery pack, the battery cell 110 will expand in volume due to the charge and discharge cycle and changes in ambient temperature, or change in displacement due to external forces such as vibration. This may cause the signal acquisition circuit to break easily due to stress concentration or poor contact interface, posing a safety hazard.

[0051] In view of the above problems, the present application improves the signal acquisition component 20. Specifically, refer to Figure 4 In the present application, the connection between the conductive member 230 and the connection row 220 is set as a movable connection, and / or the connection between the conductive member 230 and the circuit board 210 is set as a movable connection.

[0052] Specifically, the first end 231 of the conductive member 230 may be movably connected to the connection row 220 ; the second end 232 of the conductive member 230 may be connected to the circuit board 210 ; or the first end 231 of the conductive member 230 may be movably connected to the connection row 220 , and the second end 232 of the conductive member 230 may also be movably connected to the circuit board 210 .

[0053] Taking the first end 231 of the conductive member 230 being movably connected to the connecting row 220 as an example, the movably connected means in the present application that the first end 231 of the conductive member 230 can have a degree of freedom in at least one direction relative to the connecting row 220. In this way, the degree of freedom in at least one direction is such that: when the battery cell 110 undergoes expansion deformation and displacement changes in the same direction, the connecting row 220 also undergoes displacement changes. At this time, the first end 231 of the conductive member 230 can move relative to the connecting row 220, thereby buffering and releasing the stress acting on the first end 231 of the conductive member 230, avoiding disconnection of the electrical connection with the connecting row 220, thereby greatly improving the signal reliability and safety of the signal acquisition component 20, and further improving the life of the product. When the second end 232 of the conductive member 230 is set to be movably connected to the circuit board 210, the same effect is achieved and will not be repeated.

[0054] In the energy storage device 100 of each embodiment of the present application, the conductive member 230 and at least one of the connecting bar 220 or the circuit board 210 are configured to be movably connected, and the movable connection can adapt to the expansion deformation or displacement change of the battery cell 110 in one or more directions, thereby avoiding the disconnection of the electrical connection between the conductive member 230 and the connecting bar 220, or avoiding the disconnection of the electrical connection between the conductive member 230 and the circuit board 210.

[0055] The following is further described in detail with reference to the accompanying drawings.

[0056] In some embodiments, the first end 231 of the conductive member 230 is slidably connected to the connection row 220 in the first direction X and / or the second direction Y, and the second end 232 of the conductive member 230 is fixed to the circuit board 210 .

[0057] Specifically, refer to Figures 4 to 6 In the first embodiment, the first end 231 of the conductive member 230 is slidably connected to the connection row 220 along the first direction X, and the second end 232 of the conductive member 230 is fixed to the circuit board 210. The second end 232 of the conductive member 230 is fixed to the circuit board 210 by, for example, welding.

[0058] The first end 231 of the conductive member 230 is slidably matched with the connecting bar 220 in the first direction X. If the battery cell 110 is deformed, displaced, etc. in the first direction X, the conductive member 230 can slide relative to the connecting bar 220, thereby buffering and releasing the force acting on the first end 231 of the conductive member 230, avoiding disconnection of the electrical connection with the connecting bar 220, thereby greatly improving the reliability and safety of the signal acquisition component 20.

[0059] refer to Figures 7 to 9 In the second embodiment, the first end 231 of the conductive member 230 is connected to the connection row 220 by sliding along the second direction Y, and the second end 232 of the conductive member 230 is fixed to the circuit board 210. When the first end 231 of the conductive member 230 can slide in the second direction Y relative to the connection row 220, it can adapt to the expansion deformation, displacement change, etc. of the battery cell 110 in the second direction Y.

[0060] In other embodiments, when the first end 231 of the conductive member 230 can slide along the first direction X and the second direction Y relative to the connecting row 220 , it can simultaneously adapt to the expansion deformation, displacement change, etc. of the battery cell 110 in the first direction X and the second direction Y.

[0061] In some embodiments, an elastic portion 211 is disposed on a side of the circuit board 210 , and the second end 232 of the conductive member 230 is fixed to the elastic portion 211 .

[0062] Specifically, refer to Figure 4 The edge of the circuit board 210 is provided with a gap, and the gap forms a cantilever elastic part 211 on the side of the circuit board 210. The second end 232 of the conductive member 230 is fixed to the elastic part 211 by welding, for example.

[0063] In this way, when the battery cell 110 expands, deforms or changes its displacement in the second direction Y, the elastic portion 211 of the circuit board 210 can also be stretched and deformed in the second direction Y, and can cooperate with the sliding fit of the conductive member 230 and the connecting row 220, thereby enhancing the ability of the signal acquisition component 20 to resist the risk of breakage in the second direction Y.

[0064] In some embodiments, the connecting row 220 is provided with a guide groove 222, and the first end 231 of the conductive member 230 is provided with a sliding block 233, and the sliding block 233 is arranged in the guide groove 222, and the size of the guide groove 222 in the first direction X is larger than the size of the sliding block 233 in the first direction X, and / or, the size of the guide groove 222 in the second direction Y is larger than the size of the sliding block 233 in the second direction Y.

[0065] Specifically, refer to Figures 4 to 6In the first embodiment, the connecting row 220 is provided with a rectangular guide groove 222, and the guide groove 222 penetrates the connecting row 220 along the thickness direction of the connecting row 220. The thickness direction of the connecting row 220 is consistent with the height direction of the energy storage device 100. A protruding sliding block 233 is provided on the lower surface of the first end 231 of the conductive member 230. The sliding block 233 is embedded in the guide groove 222 from top to bottom. Moreover, the groove width of the guide groove 222 in the first direction X is greater than the size of the sliding block 233 in the first direction X. With this arrangement, the sliding block 233 and the guide groove 222 can slide relative to each other in the first direction X. In addition, when the groove width of the guide groove 222 in the second direction Y is greater than the size of the sliding block 233 in the second direction Y, the sliding block 233 and the guide groove 222 can also slide relative to each other in the second direction Y.

[0066] In the first embodiment, the second end 232 of the conductive member 230 is fixed, and the sliding block 233 can be inserted into the guide groove 222 on the surface of the connecting row 220 to achieve sliding fit, and the structure is simple.

[0067] Optionally, a guide rail 223 is provided in the guide groove 222, and a first gap 2221 and a second gap 2222 are respectively provided between the two sides of the guide rail 223 and the groove wall of the guide groove 222; the sliding block 233 includes a first hook 2331 and a second hook 2332 respectively connected to the two sides of the lower surface of the first end 231, the first hook 2331 is inserted into the first gap 2221 and hooks the guide rail 223, and the first hook 2331 is inserted into the second gap 2222 and hooks the guide rail 223.

[0068] In the first embodiment, the first gap 2221 and the second gap 2222 are arranged in the second direction Y. The first hook 2331 and the second hook 2332 extend from opposite sides of the lower surface of the first end 231. When the first end 231 of the conductive member 230 is assembled to the connecting row 220, the first hook 2331 can be inserted from the first gap 2221 and hook the guide rail 223, and the first hook 2331 can be inserted from the second gap 2222 and hook the guide rail 223. The lower surface of the first end 231 is supported by the surface of the connecting row 220.

[0069] With this design, the first end 231 of the conductive member 230 is slidably connected through the cooperation between the first hook 2331 and the second hook 2332 and the guide groove 222 , and the first end 231 of the conductive member 230 and the connection row 220 will not separate in the third direction Z.

[0070] Furthermore, the guide rail 223 is a flexible member, or a buffer layer is provided between the guide rail 223 and the first hook portion 2331 , or a buffer layer is provided between the guide rail 223 and the second hook portion 2332 .

[0071] Optionally, the guide rail 223 is hollow inside, or has a plurality of through slots to enable elastic deformation in the third direction Z. Optionally, the material of the buffer layer is foam, which can be bonded to the first hook 2331 .

[0072] This setting can absorb the adverse vibrations generated by the energy storage device during intense operation and has an active protection function when it is subjected to external impact.

[0073] Furthermore, the first hook 2331 and the second hook 2332 are spaced apart and form a guide channel with the lower surface of the first end 231 in the third direction Z. The guide channel and the guide rail 223 are relatively slidably matched in the first direction X and the second direction Y.

[0074] Specifically, taking the first embodiment as an example, the dimensions of the first hook 2331 and the second hook 2332 in the first direction X are smaller than the dimensions of the guide rail 223 in the first direction X, so that the first hook 2331 and the second hook 2332 can slide left and right relative to the connection row 220 in the first direction X. At the same time, the first hook 2331 and the second hook 2332 are spaced apart from the groove wall of the adjacent guide groove 222 and the guide rail 223 in the second direction Y, so that the first hook 2331 and the second hook 2332 can also slide left and right relative to the connection row 220 in the second direction Y.

[0075] refer to Figures 7 to 9 In the second embodiment, the guide groove 222 penetrates the edge of the connection row 220 in the second direction Y. For the connection row 220, the size in the first direction X is relatively large, and the size in the second direction Y is relatively small, so the guide groove 222 is conveniently made to penetrate the edge of the connection row 220 in the second direction Y. This arrangement can facilitate the sliding part to be inserted into the guide groove 222 from one side of the connection row 220 in the second direction Y.

[0076] Further, in the second embodiment, a guide rail 223 is also provided in the guide groove 222, and a first gap 2221 and a second gap 2222 are respectively provided between the guide rail 223 and the two groove walls of the guide groove 222 in the first direction X. In addition, the first hook 2331 and the second hook 2332 are arranged at intervals in the first direction X, and both form a guide channel with the lower surface of the first end 231 in the third direction Z, and the guide channel and the guide rail 223 are relatively slidably matched in the first direction X and the second direction Y. Specifically, the first hook 2331 and the second hook 2332 are arranged at intervals with the groove wall of the adjacent guide groove 222 in the first direction X, and are arranged at intervals with the guide rail 223. In this way, the first hook 2331 and the second hook 2332 can slide left and right in the first direction X relative to the connection row 220; at the same time, the first hook 2331 and the second hook 2332 can also slide left and right in the second direction Y relative to the connection row 220.

[0077] In the second embodiment, when the guide groove 222 on the connecting row 220 passes through the edge of the connecting row 220 in the second direction Y, the first hook 2331 and the second hook 2332 can be configured to be able to partially slide out of the guide groove 222; thereby, the space outside the connecting row 220 can be utilized to realize the relative sliding of the conductive member 230 and the connecting row 220 in the second direction Y.

[0078] In some embodiments, reference Figure 4 and Figure 5 An elastic element 234 is disposed between the first hook portion 2331 or the second hook portion 2332 and the groove wall of the guide groove 222 .

[0079] Taking the sliding fit of the conductive member 230 and the connecting row 220 in the first direction X as an example, the elastic element 234 can be arranged on the side of the first hook 2331 facing away from the second hook 2332. In this way, in the second direction Y, the elastic element 234 is arranged between the first hook 2331 and the groove wall of the guide groove 222. The elastic element 234 makes the first hook 2331 and the guide rail 223 in close contact in the second direction Y. When the conductive member 230 slides relative to the connecting row 220 in the first direction X, the elastic element 234 is compressed or stretched, and can adapt to the sliding of the conductive member 230. When the conductive member 230 and the connecting row 220 slide in the second direction Y, the elastic element 234 can be arranged in the same way, which will not be repeated.

[0080] In this embodiment, the elastic element 234 causes the first hook portion 2331 or the second hook portion 2332 to be pressed against the guide rail 223 , so that the conductive member 230 and the connection row 220 can maintain reliable mechanical contact while sliding relative to each other.

[0081] In some embodiments, the conductive member 230 is made of nickel, the connecting bar 220 is made of aluminum, and the surface of the connecting bar 220 is provided with a conductive layer located outside the guide groove 222. The conductive layer is, for example, a copper foil layer or a nickel foil layer with a thickness of 18 μm-35 μm. The conductive layer reduces the contact resistance between the first end 231 and the connecting bar 220, so that when the two slide relative to each other, they can maintain a relatively reliable electrical connection.

[0082] In some embodiments, the maximum relative movable range between the first end 231 of the conductive element 230 and the connection row 220 is 0.6-4 mm; the maximum relative movable range between the second end 232 of the conductive element 230 and the circuit board 210 is 0.6-4 mm.

[0083] In this embodiment, the maximum relative range of the conductive member 230 and the connecting bar 220 or the circuit board 210 is 0.6-4 mm, so as to adapt to the displacement change of the expansion and deformation of the common specification battery cell 110. For details, see Table 1 below.

[0084] Table 1

[0085] In Table 1, the size (L) of the battery cell 110 is its size along the second direction Y, W is its size along the first direction X, and H is its size along the third direction Z. As can be seen from Table 1, the expansion deformation of the battery cell 110 of common specifications and sizes in different directions within its working range is usually within a maximum of 0.52 mm.

[0086] To this end, in this embodiment, the maximum relative displacement between the conductive member 230 and the circuit board 210 or the connecting row 220 in different directions is set to 0.6-4mm. On the basis of adapting to the displacement changes of the expansion and deformation of the common specification battery cell 110, the relative activity range is reduced as much as possible to maintain the stability of the contact interface.

[0087] In some embodiments, reference Figures 10 to 12 In the third embodiment, the first end 231 of the conductive member 230 is rotated on the connection row 220. In the specific configuration, a connection hole 224 may be provided on one of the first end 231 and the connection row 220, and a pin shaft portion 2311 may be provided on the other of the two. Through the cooperation between the pin shaft portion 2311 and the connection hole 224, the first end 231 and the connection row 220 can rotate relative to each other within a certain range. In this embodiment, specifically, a pin shaft portion 2311 is provided on the lower surface of the first end 231, and a penetrating connection hole 224 is provided on the connection row 220.

[0088] The first end 231 of the conductive member 230 can rotate relative to the connecting row 220. No matter the battery cell 110 expands, deforms, or changes its displacement in the first direction X or the second direction Y, the conductive member 230 can move accordingly, thereby buffering and releasing the stress acting on the first end 231 of the conductive member 230.

[0089] Furthermore, the pin shaft portion 2311 and the connection hole 224 can move relative to each other in the third direction Z; and the pin shaft portion 2311 and the connection hole 224 are configured to be able to swing relative to each other. Specifically, taking the relative swing in the first direction X as an example, with the connection row 220 as a reference, the pin shaft portion 2311 can swing back and forth relative to the connection row 220. Similarly, in the second direction Y, the pin shaft portion 2311 can swing back and forth relative to the connection row 220; or in a plane perpendicular to the third direction Z, the pin shaft portion 2311 can swing back and forth in any direction relative to the connection row 220.

[0090] With this design, the first end 231 of the conductive member 230 can interact with the connecting row 220 in any direction, thereby achieving freedom in multiple directions. Therefore, no matter in which direction the battery cell 110 expands, deforms, or changes in displacement, the conductive member 230 can move accordingly, thereby buffering and releasing the force acting on the first end 231 of the conductive member 230.

[0091] In some embodiments, the pin shaft portion 2311 is an elastic member, and the pin shaft portion 2311 and the connecting hole 224 are interference fit.

[0092] Optionally, the pin shaft portion 2311 is provided with a plurality of slots along the circumferential direction, and the slots divide the pin shaft portion 2311 into a plurality of elastic pieces that can be gathered toward the axis of the pin shaft portion 2311. The entire pin shaft portion 2311 is formed as an elastic member with elastic deformation capability. In this way, after the pin shaft portion 2311 is inserted into the connection hole 224, it is closely abutted against the inner wall of the connection hole 224, thereby being able to adapt to the relative movement between the two, while maintaining reliable mechanical contact, and establishing a stable and reliable electrical connection.

[0093] In some embodiments, reference Figures 10 to 12 A connecting hole 224 is opened on the connecting row 220, and the second end 232 of the conductive member 230 is connected to a pin shaft portion 2311, and a blocking piece 2312 is provided at the end of the pin shaft portion 2311. The pin shaft portion 2311 is located in the connecting hole 224, and the blocking piece 2312 and the second end 232 are located on both sides of the connecting row 220.

[0094] In a specific configuration, the outer diameter of the baffle 2312 is larger than the inner diameter of the connection hole 224 , so that the baffle 2312 can prevent the pin shaft portion 2311 from being separated from the connection row 220 in the third direction Z. In addition, there is also a large contact area between the baffle 2312 and the connection row 220 , which is beneficial to the transmission of electrical signals between the conductive member 230 and the connection row 220 .

[0095] Optionally, the side of the baffle 2312 facing the battery cell 110 is a flexible layer. In this way, the flexible baffle 2312 establishes a buffer barrier between the end of the pin shaft portion 2311 and the battery cell 110 to prevent the pin shaft portion 2311 from colliding with the battery cell 110 when moving in the third direction Z, thereby avoiding interference with the normal operation of the battery cell 110.

[0096] In some embodiments, reference Fig.13 The first end 231 of the conductive member 230 is movably connected to a fixing portion 235 , and the fixing portion 235 is fixed to the connection row 220 .

[0097] Specifically, the first end 231 of the conductive member 230 is provided with a fixing portion 235, and the fixing portion 235 and the first end 231 are relatively slidably matched in the second direction Y. The specific implementation method of the relative sliding match here can be, for example, Figures 7 to 9 The design scheme of the first hook portion 2331 and the second hook portion 2332 is shown. Specifically, the first end 231 of the conductive member 230 may be provided with a guide rail 223 , and the fixing portion 235 may be provided with a sliding block 233 .

[0098] Accordingly, the first end 231 and the fixing portion 235 may also be relatively slidably matched in the first direction X. In addition, the first end 231 and the fixing portion 235 may also be rotatably connected. The specific method of the rotatable connection may be, for example, Figures 10 to 12 The pin shaft portion 2311 is shown to cooperate with the connection hole 224. The fixing portion 235 can be welded to the connection row 220.

[0099] In this embodiment, the conductive member 230 can be understood as a two-piece design, with the two parts movably connected. By making the fixing portion 235 fixedly connected to the connecting row 220, the conductive member 230 and the connecting row 220 are always electrically connected through the fixing portion 235, thereby reducing the risk of unstable contact interface caused by direct relative movement between the conductive member 230 and the connecting row 220. Specifically, the connecting row 220 is fixed on the battery cell 110 and moves with the battery cell 110. The battery cell 110 is an active element that causes the connecting row 220 to move. The connection between the connecting row 220 and the fixing portion 235 is maintained and will not be disconnected because the two can move relative to each other.

[0100] In some embodiments, reference Fig.14The first end 231 of the conductive member 230 is connected to the fixing portion 235 via a spring 236. With this design, the spring 236 can adapt to the expansion and deformation of the battery cell 110 in any direction, and reset the conductive member 230 when the temperature of the battery cell 110 drops.

[0101] In some embodiments, reference Fig.15 and Fig.16 The conductive member 230 has an arch portion 237 between the first end 231 and the second end 232. An elastic member 238 is arranged in the receiving groove 2371 formed by the arch portion 237. Both ends of the elastic member 238 are respectively connected to the groove wall of the receiving groove 2371 in the second direction Y.

[0102] In this embodiment, the connection between the first end 231 of the conductive member 230 and the connection row 220 and the connection between the second end 232 and the circuit board 210 may be the same as those in the above embodiments. In this embodiment, an arched portion 237 and an elastic member 238 are further added.

[0103] Specifically, the arched portion 237 protrudes upward relative to the battery cell 110, and the lower surface of the arched portion 237 forms a bottom-open receiving groove 2371. In the second direction Y, the arched portion 237 includes a first side wall 2372, a second side wall 2373, and a top wall 2374 connecting the top of the first side wall 2372 and the top of the second side wall 2373. The first side wall 2372, the second side wall 2373, and the top wall 2374 jointly define the receiving groove 2371. The elastic member 238 is, for example, a spring 236. The two ends of the elastic member 238 connect the first side wall 2372 and the second side wall 2373.

[0104] Therefore, the arrangement of the arched portion 237 and the elastic member 238 in this embodiment provides a double-stage buffer. Specifically, when the battery cell 110 expands or changes in displacement in the second direction Y, the upwardly protruding arched portion 237 is stretched or compressed in the second direction Y, thereby offsetting a portion of the expansion force or displacement change. In this process, the elastic member 238 is stretched or compressed in the second direction Y, thereby absorbing the capacity. When the temperature of the battery cell 110 drops, the elastic member 238 causes the arched portion 237 to automatically reset to avoid accumulation of plastic deformation. Therefore, the conductive member 230 of this embodiment can adapt to the deformation absorption capacity and take into account the needs of mechanical buffering and stable conduction.

[0105] Furthermore, the elastic member 238 is configured to constantly provide pressure to the first end 231 .

[0106] In a specific configuration, the length of the elastic member 238 is greater than the distance between the first side wall 2372 and the second side wall 2373, so that the elastic member 238 has a pre-compression amount. That is, when the battery cell 110 does not expand due to temperature changes, the elastic member 238 is in a compressed state. In this way, the elastic member 238 always provides pressure to the first end 231, so that the first end 231 can be pressed tightly against the connection row 220.

[0107] Optionally, the pre-compression amount of the elastic member 238 during installation is 20%-30%, ensuring that the initial contact pressure between the first end 231 and the connection row 220 is ≥5N to maintain conductivity. The material of the elastic member 238 is, for example, gold-plated stainless steel, with an operating temperature range of -40°C to 150°C, and has good temperature resistance.

[0108] In this embodiment, by configuring the elastic member 238 to pre-press the first end 231 , it is possible to ensure that the contact interface between the first end 231 and the connection row 220 is always tight, thereby avoiding an increase in impedance caused by micro-motion wear between the two.

[0109] Optionally, the elastic member 238 is a spring, which is detachably connected to the first side wall 2372 and the second side wall 2373. In this way, springs with different K values ​​can be replaced to match the expansion characteristics of different battery cells 110, which has strong versatility. The K value is the stiffness of the spring, which is defined as the force required for unit deformation, and the unit is N / mm.

[0110] In some embodiments, reference Fig.17 , the first end 231 and the second end 232 of the conductive member 230 are connected via a spring 236. In this embodiment, the first end 231 and the second end 232 of the conductive member 230 are directly connected via the spring 236.

[0111] When the battery cell 110 expands or changes its displacement in the second direction Y, the spring 236 is stretched or compressed in the second direction Y, thereby absorbing the deformation. When the temperature of the battery cell 110 drops, the spring 236 is reset to avoid accumulation of plastic deformation. Therefore, the conductive member 230 of this embodiment can adapt to the deformation absorption capacity and take into account the requirements of mechanical buffering and stable conduction.

[0112] In addition, the spring 236 can also adapt to the deformation of the battery cell 110 in any other direction except the second direction Y. Taking the expansion deformation in the third direction Z as an example, the spring 236 can also be twisted and deformed in the third direction Z.

[0113] In specific implementation, optionally, taking the connection between the first end 231 and the spring 236 as an example, a through hole may be set on the first end 231, and the end of the spring 236 may be hooked into the through hole; the connection between the second end 232 and the spring 236 may be set in a similar manner.

[0114] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0115] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0116] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0117] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0118] The above embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. An energy storage device, characterized in that: include: A battery pack, comprising a plurality of battery cells arranged in sequence along a first direction; A signal acquisition component, the signal acquisition component includes a circuit board, a plurality of connection rows and a plurality of conductive members, the circuit board is located on one side of the connection row in a second direction, the second direction is perpendicular to the first direction, the connection row connects the poles of two adjacent battery cells, the first end of the conductive member is connected to the connection row, the second end of the conductive member is connected to the circuit board, wherein the conductive member is movably connected to the connection row and / or the circuit board.

2. The energy storage device according to claim 1, characterized in that: The first end of the conductive member is slidably connected to the connection row in the first direction and / or the second direction, and the second end of the conductive member is fixed to the circuit board.

3. The energy storage device according to claim 2, characterized in that: An elastic part is arranged on the side of the circuit board, and the second end of the conductive member is fixed to the elastic part.

4. The energy storage device according to claim 2, characterized in that: The connecting row is provided with a guide groove, the first end of the conductive member is provided with a sliding block, the sliding block is arranged in the guide groove, the size of the guide groove in the first direction is larger than the size of the sliding block in the first direction, and / or the size of the guide groove in the second direction is larger than the size of the sliding block in the second direction.

5. The energy storage device according to claim 4, characterized in that: A guide rail is provided in the guide groove, and a first gap and a second gap are respectively formed between the two sides of the guide rail and the groove wall of the guide groove; the sliding block includes a first hook and a second hook respectively connected to the two sides of the lower surface of the first end, the first hook is inserted from the first gap and hooks the guide rail, and the first hook is inserted from the second gap and hooks the guide rail.

6. The energy storage device according to claim 5, characterized in that: The guide rail is a flexible member, or a buffer layer is provided between the guide rail and the first hook portion, or a buffer layer is provided between the guide rail and the second hook portion.

7. The energy storage device according to claim 5, characterized in that: The first hook and the second hook are spaced apart and form a guide channel with the lower surface of the first end in a third direction. The guide channel and the guide rail are relatively slidably matched in the first direction and the second direction. The third direction is perpendicular to both the first direction and the second direction.

8. The energy storage device according to claim 4, characterized in that: The guide groove penetrates through the edge of the connection row in the second direction.

9. The energy storage device according to claim 4, characterized in that: The conductive member is made of nickel, the connecting bar is made of aluminum, and a conductive layer is disposed on the surface of the connecting bar at the periphery of the guide groove.

10. The energy storage device according to claim 1, characterized in that: The first end of the conductive element is rotated on the connecting row.

11. The energy storage device according to claim 10, characterized in that: The connecting row is provided with a connecting hole, and the second end of the conductive member is connected to a pin shaft portion; the pin shaft portion and the connecting hole can cooperate to be relatively movably in a third direction, the third direction is perpendicular to the first direction and the second direction, and the pin shaft portion and the connecting hole are arranged to be able to swing relative to each other.

12. The energy storage device according to claim 10, characterized in that: The connection row is provided with a connection hole, the first end of the conductive member is connected with a pin shaft portion, the end of the pin shaft portion is provided with a blocking piece, the pin shaft portion is passed through the connection hole, and the blocking piece and the first end are located on both sides of the connection row.

13. The energy storage device according to claim 1, characterized in that: The first end of the conductive member is movably connected to a fixing portion, and the fixing portion is fixed to the connection row.

14. The energy storage device according to claim 13, characterized in that: The first end of the conductive member is connected to the fixing portion via a spring.

15. The energy storage device according to claim 1, characterized in that: The conductive member has an arched portion between the first end and the second end. An elastic member is disposed in the receiving groove formed by the arched portion. Both ends of the elastic member are respectively connected to the groove wall of the receiving groove in the second direction.

Images