Energy storage device

Abstract

The present application belongs to the field of energy storage technology and relates to an energy storage device, comprising: 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 connecting rows and a plurality of conductive members, the circuit board being located on one side of the connecting row in a second direction, the second direction being perpendicular to the first direction, the connecting row connecting the poles of two adjacent battery cells, the first end of the conductive member being connected to the connecting row, the second end of the conductive member being connected to the circuit board, wherein the conductive member is movably connected to the connecting row and / or the circuit board. The conductive member is configured to be movably connected to at least one of the connecting row or the circuit board, and the movably connected 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.

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 modules are a key technology in the field of new energy. In the prior art, battery energy storage modules are usually implemented by battery packs. Battery packs usually contain 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 a signal acquisition component. The signal acquisition component usually includes an aluminum bar, a circuit board, and a nickel sheet connecting the aluminum bar to 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 battery poles by the external circuit.

[0003] During the recycling process of the battery pack, the volume expansion caused by the charge and discharge cycle and the change of ambient temperature (for example, the expansion force of lithium-ion batteries can reach 5%-10%) 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 assembly comprising a circuit board, a plurality of connecting bars, and a plurality of conductive members, wherein the circuit board is located on one side of the connecting bar in a second direction, the second direction being perpendicular to the first direction, the connecting bar connecting poles of two adjacent battery cells, a first end of the conductive member being connected to the connecting bar, and a second end of the conductive member being connected to the circuit board, wherein the conductive member is movably connected to the connecting bar and / or the circuit board.

[0006] In some embodiments, the first end of the conductive member is slidably connected to the connection bar 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 slide relative to each other 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 connecting 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 provided on the surface of the connecting bar around the outer periphery of the guide groove.

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

[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 relative to each other 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 connection hole is provided on the connection row, the first end of the conductive member is connected to a pin shaft portion, a blocking piece is provided at the end of the pin shaft portion, 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.

[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 provided in the accommodating groove formed by the arched portion, and both ends of the elastic member are respectively connected to the groove wall of the accommodating groove in the second direction.

[0020] In the above-mentioned energy storage device, the conductive member and at least one of the connecting bar or the circuit board are configured to be movably connected. The movably connected connection can adapt to the expansion deformation or displacement change of the battery cell in one or more directions, thereby avoiding the disconnection of the electrical connection between the conductive member and the connecting bar, or avoiding the 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 structural diagram of the energy storage device of an embodiment of the present application when placed on a base plate.

[0023] Figure 3 This is a structural diagram 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 Example 1 of the present application.

[0026] Figure 6 This is a structural diagram of the connection bar 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 Example 2 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 Example 2 of the present application.

[0029] Figure 9 This is a structural diagram of the connection bar in the signal acquisition circuit of Example 2 of the present application.

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

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

[0032] Figure 12 This is a structural diagram of the connection bar in the signal acquisition circuit of Example 3 of the present application.

[0033] Figure 13 This is a schematic diagram of the local structure of the conductive component in the signal acquisition circuit of Example 4 of the present application.

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

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

[0036] Figure 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] Figure 17 This is a structural diagram 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 assembly; 210, circuit board; 211, elastic portion; 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 portion; 2312 , baffle; 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] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0041] In the description of this 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 this 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 this application.

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

[0043] See Figures 1 to 4 , this 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 assembly 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, which 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. The conductive member 230 is movably connected to the connection bar 220 and / or the circuit board 210.

[0045] In this application, the energy storage device 100 is further provided with end plates 30 on either side of the battery pack 10 in the first direction X. These end plates 30 secure the multiple battery cells 110 in the center. A battery management system (BMS) can be mounted on the end plates 30. The BMS collects information such as voltage and temperature from each battery cell 110 via a signal acquisition component 20. Furthermore, the multiple battery packs 10 can be secured together using a steel band 40. The steel band 40 wraps around the multiple battery cells 110.

[0046] Furthermore, the energy storage device 100 of the present application may further include a base plate 50. The base plate 50 is disposed below the battery pack 10. Furthermore, multiple battery packs 10 may be placed simultaneously on a single base plate 50. Furthermore, the energy storage device 100 may further include a module cover 60. The module cover 60 is disposed above the signal acquisition component 20 and covers the 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. The multiple battery cells 110 are stacked and arranged in their thickness direction, with the thickness direction of the battery cells 110 along the first direction X and the length direction of the battery cells 110 along the second direction Y. The height direction of the battery cells 110 is consistent with the height direction of the energy storage device 100, both along the third direction Z.

[0048] 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. Battery cell 110 is filled with an electrolyte, which contains electrolytes and serves as a carrier for ion transport within the battery. The electrolyte is generally composed of a lithium salt and an organic solvent. During the charging and discharging process of a lithium battery, lithium ions migrate back and forth between the positive and negative electrodes. The electrolyte is the medium for the lithium ion migration and transfer, creating a potential difference between the positive and negative electrodes of the battery, thereby generating current and enabling the battery to function properly.

[0049] The signal acquisition assembly 20 is used to connect the battery cells 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 connecting bars 220, and a plurality of conductive members 230. Each connecting bar 220 is used to connect the poles 112 of two adjacent battery cells 110 in the first direction X. The connecting bar 220 is provided with a through hole 221 (see FIG. 2 ) that matches the pole 112. 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 to 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, which may cause the signal acquisition circuit to easily break due to stress concentration or have a 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 bar 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 example of the first end 231 of the conductive member 230 being movably connected to the connecting bar 220, the movably connected portion in this application refers to the first end 231 of the conductive member 230 being able to have a degree of freedom in at least one direction relative to the connecting bar 220. In this way, the degree of freedom in at least one direction enables: when the battery cell 110 undergoes expansion, deformation, and displacement changes in the same direction, the connecting bar 220 also undergoes displacement changes. At this time, the first end 231 of the conductive member 230 can move relative to the connecting bar 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 bar 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 here.

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

[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 bar 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 slides with the connecting bar 220 in the first direction X. If the battery cell 110 undergoes expansion, deformation, displacement, or other changes 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 and preventing the electrical connection with the connecting bar 220 from being disconnected, thereby greatly improving the reliability and safety of the signal acquisition assembly 20.

[0059] refer to Figures 7 to 9 In the second embodiment, the first end 231 of the conductive member 230 is slidably connected to the connecting bar 220 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 is able to slide relative to the connecting bar 220 in the second direction Y, it can adapt to expansion, deformation, displacement, 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 relative to the connecting bar 220 in both the first direction X and the second direction Y, it can simultaneously adapt to the expansion deformation and displacement change of the battery cell 110 in both 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, which forms a cantilevered elastic portion 211 on the side of the circuit board 210. The second end 232 of the conductive member 230 is fixed to the elastic portion 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 fracture 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. 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 passes through 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. The lower surface of the first end 231 of the conductive member 230 is provided with a protruding sliding block 233. The sliding block 233 is embedded in the guide groove 222 from top to bottom. In addition, 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 is inserted into the guide groove 222 on the surface of the connecting row 220 to achieve sliding fit, which has a simple structure.

[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. A first hook 2331 and a second hook 2332 extend in opposite directions from the lower surface of the first end 231. When the first end 231 of the conductive member 230 is assembled to the connecting bar 220, the first hook 2331 can be inserted through the first gap 2221 and hook onto the guide rail 223. The first hook 2331 can be inserted through the second gap 2222 and hook onto the guide rail 223. The lower surface of the first end 231 rests against the surface of the connecting bar 220.

[0069] With this design, the first end 231 of the conductive member 230 is slidably connected through the cooperation of the first hook 2331 and the second hook 2332 with 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 buffer layer is made of foam and 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 both smaller than the dimensions of the guide rail 223 in the first direction X. Thus, the first hook 2331 and the second hook 2332 can slide left and right relative to the connecting bar 220 in the first direction X. Furthermore, the first hook 2331 and the second hook 2332 are spaced apart from the adjacent groove walls of the guide groove 222 and the guide rail 223 in the second direction Y. Thus, the first hook 2331 and the second hook 2332 can also slide left and right relative to the connecting bar 220 in the second direction Y.

[0075] refer to Figures 7 to 9 In the second embodiment, the guide groove 222 extends through the edge of the connecting row 220 in the second direction Y. Since the connecting row 220 is relatively large in the first direction X and relatively small in the second direction Y, the guide groove 222 is conveniently formed to extend through the edge of the connecting row 220 in the second direction Y. This arrangement facilitates the insertion of the sliding portion into the guide groove 222 from one side of the connecting row 220 in the second direction Y.

[0076] Furthermore, in the second embodiment, a guide rail 223 is also provided within the guide groove 222. A first gap 2221 and a second gap 2222 are respectively formed between the guide rail 223 and the two groove walls of the guide groove 222 in the first direction X. Furthermore, a first hook 2331 and a second hook 2332 are spaced apart in the first direction X, and each hook forms 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 slide relative to each other in both the first direction X and the second direction Y. Specifically, the first hook 2331 and the second hook 2332 are spaced apart from the adjacent groove walls of the guide groove 222 in the first direction X, and are spaced apart from the guide rail 223. Thus, the first hook 2331 and the second hook 2332 can slide left and right relative to the connecting bar 220 in the first direction X. Simultaneously, the first hook 2331 and the second hook 2332 can also slide left and right relative to the connecting bar 220 in the second direction Y.

[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 partially slide out of the guide groove 222; thereby, the space outside the connecting row 220 can be utilized to achieve 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 provided 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 engagement of the conductive member 230 and the connecting bar 220 in the first direction X as an example, the elastic element 234 can be disposed on the side of the first hook 2331 facing away from the second hook 2332. Thus, in the second direction Y, the elastic element 234 is disposed between the first hook 2331 and the wall of the guide slot 222. The elastic element 234 ensures close contact between the first hook 2331 and the guide rail 223 in the second direction Y. When the conductive member 230 slides relative to the connecting bar 220 in the first direction X, the elastic element 234 is compressed or stretched, accommodating the sliding motion of the conductive member 230. The elastic element 234 can be disposed in a similar manner when the conductive member 230 and the connecting bar 220 slide in the second direction Y, and further description will not be given.

[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 bar 220 maintain reliable mechanical contact while sliding relative to each other.

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

[0082] In some embodiments, the maximum relative motion range between the first end 231 of the conductive member 230 and the connection bar 220 is 0.6-4 mm; the maximum relative motion range between the second end 232 of the conductive member 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, thereby being able to adapt to the displacement changes caused by the expansion and deformation of common battery cells 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, for battery cells 110 of common specifications and sizes, the maximum expansion deformation in different directions within their operating range is generally within 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 bar 220 in different directions is set to 0.6-4mm. On the basis of adapting to the displacement changes caused by the expansion and deformation of the common specifications of the battery cell 110, the relative activity range is minimized 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 rotatable on the connecting bar 220. Specifically, a connecting hole 224 may be provided on either the first end 231 or the connecting bar 220, and a pin 2311 may be provided on the other. The pin 2311 cooperates with the connecting hole 224, allowing the first end 231 and the connecting bar 220 to rotate relative to each other within a certain range. In this embodiment, the pin 2311 is provided on the lower surface of the first end 231, and the connecting hole 224 is provided through the connecting bar 220.

[0088] The first end 231 of the conductive member 230 is rotatable relative to the connecting bar 220. Regardless of whether the battery cell 110 expands, deforms, or changes in displacement in the first direction X or the second direction Y, the conductive member 230 is able to move accordingly, thereby buffering and releasing the stress acting on the first end 231 of the conductive member 230.

[0089] Furthermore, the pin portion 2311 and the connecting hole 224 are capable of relative movement in the third direction Z, and are configured to swing relative to each other. Specifically, taking the relative swingability in the first direction X as an example, with the connecting row 220 as a reference, the pin portion 2311 can swing back and forth relative to the connecting row 220. Similarly, the pin portion 2311 can swing back and forth relative to the connecting row 220 in the second direction Y, or within a plane perpendicular to the third direction Z, the pin portion 2311 can swing back and forth in any direction relative to the connecting 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, 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 portion 2311 is an elastic member, and the pin portion 2311 is interference fit with the connecting hole 224 .

[0092] Optionally, the pin portion 2311 is provided with a plurality of slots along its circumference, which divide the pin portion 2311 into a plurality of elastic pieces that can be gathered toward the axis of the pin portion 2311. The entire pin portion 2311 is formed as an elastic member with elastic deformation capabilities. Thus, when the pin portion 2311 is inserted into the connection hole 224, it tightly abuts against the inner wall of the connection hole 224, thereby accommodating 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 provided 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 separating from the connection bar 220 in the third direction Z. In addition, there is also a large contact area between the baffle 2312 and the connection bar 220, which is beneficial to the transmission of electrical signals between the conductive member 230 and the connection bar 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 creates a buffer barrier between the end of the pin shaft 2311 and the battery cell 110, preventing the pin shaft 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 Figure 13 The first end 231 of the conductive member 230 is movably connected to the 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 engaged in the second direction Y. The specific implementation method of the relative sliding engagement here can be, for example, Figures 7 to 9 The design 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] Correspondingly, 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 rotationally connected. The specific method of the rotational connection may be, for example, Figures 10 to 12 The pin 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 a movable connection between the two parts. By having the fixing portion 235 fixedly connected to the connecting bar 220, the conductive member 230 and the connecting bar 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 bar 220. Specifically, the connecting bar 220 is fixed to the battery cell 110 and moves with the battery cell 110. The battery cell 110 is the active element that causes the connecting bar 220 to move. The connection between the connecting bar 220 and the fixing portion 235 remains unchanged because the two can move relative to each other.

[0100] In some embodiments, reference Figure 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 Figure 15 and Figure 16 The conductive member 230 has an arched portion 237 between the first end 231 and the second end 232. An elastic member 238 is provided in the accommodating groove 2371 formed by the arched portion 237. The two ends of the elastic member 238 are respectively connected to the groove wall of the accommodating 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 bar 220 and the connection between the second end 232 and the circuit board 210 can be the same as 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 an open-bottomed 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 with the top of the second side wall 2373. The first side wall 2372, the second side wall 2373, and the top wall 2374 collectively define the receiving groove 2371. The elastic member 238 is, for example, a spring 236. Its two ends 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, avoiding the 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 conductivity.

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

[0106] Specifically, the length of the elastic member 238 is greater than the distance between the first sidewall 2372 and the second sidewall 2373, allowing the elastic member 238 to be pre-compressed. That is, when the battery cell 110 is not expanding due to temperature changes, the elastic member 238 is in a compressed state. This ensures that the elastic member 238 consistently applies pressure to the first end 231, ensuring that the first end 231 is firmly pressed against the connection bar 220.

[0107] Optionally, the elastic member 238 is pre-compressed by 20%-30% during installation to ensure that the initial contact pressure between the first end 231 and the connection bar 220 is ≥5N to maintain electrical conductivity. The elastic member 238 can be made of, for example, gold-plated stainless steel with a high operating temperature range of -40°C to 150°C, offering 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 impedance increase caused by micro-wear between the two.

[0109] Optionally, the elastic member 238 is a spring, which is detachably connected to both the first side wall 2372 and the second side wall 2373. This allows for replacement of springs with different K values to match the expansion characteristics of different battery cells 110, providing enhanced versatility. The K value represents the spring's stiffness, defined as the force required per unit of deformation, expressed in N / mm.

[0110] In some embodiments, reference Figure 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 shifts 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 returns to its original position, preventing the accumulation of plastic deformation. Thus, the conductive member 230 of this embodiment can adapt its deformation absorption capacity to meet the requirements of mechanical buffering and stable electrical conduction.

[0112] In addition, the spring 236 can also adapt to the deformation of the battery cell 110 in any direction other than 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 can be set on the first end 231, and the end of the spring 236 can be hooked into the through hole; the connection between the second end 232 and the spring 236 can be set in a similar manner.

[0114] In this application, unless otherwise specified or limited, the terms "mounted," "connected," "connected," "fixed," etc., should be interpreted broadly. For example, these terms may refer to fixed connections, removable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediary; and internal communication between two components or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0115] In this application, unless otherwise expressly specified or limited, if a first feature is described as being "above" or "below" a second feature, or similar descriptions, this 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. Furthermore, when a first feature is described as being "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is described as being "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower 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 an intermediate 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 an intermediate element. 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 embodiment.

[0117] The technical features of the above embodiments can 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 merely illustrate several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, all of which fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended 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 comprising a circuit board, a plurality of connecting bars, and a plurality of conductive members, the circuit board being located on one side of the connecting bar in a second direction, the second direction being perpendicular to the first direction, the connecting bar connecting the poles of two adjacent battery cells, a first end of the conductive member being connected to the connecting bar, and a second end of the conductive member being connected to the circuit board, wherein the conductive member is movably connected to the connecting bar and / or the circuit board; The conductive member has an arched portion between the first end and the second end, and an elastic member is provided in the accommodating groove formed by the arched portion. The two ends of the elastic member are respectively connected to the groove wall of the accommodating groove in the second direction, and the elastic member is configured to constantly provide pressure to the first end.

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 bar 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 portion is provided on the side of the circuit board, and the second end of the conductive member is fixed to the elastic portion.

4. The energy storage device according to claim 2, characterized in that The connecting row is provided with a guide groove, and the first end of the conductive member is provided with a sliding block, and 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 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.

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 in a third direction with the lower surface of the first end. The guide channel and the guide rail slide relative to each other 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 passes 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 provided 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 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 relative to each other 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 A connecting hole is provided on the connecting row, a pin portion is connected to the first end of the conductive member, a blocking piece is provided at the end of the pin portion, the pin portion is passed through the connecting hole, and the blocking piece and the first end are located on both sides of the connecting row.

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