Buffer assembly, battery module, battery device and electric equipment

Abstract

The utility model discloses a buffer assembly, a battery module, a battery device and electric equipment, the buffer assembly is used for the battery device, and the buffer assembly comprises a base, a buffer piece and a pressing plate; the buffer piece is arranged on the base; the pressing plate is arranged on the side, back to the base, of the buffering piece. The buffer member is adapted to deform to move the pressing plate relative to the base, and the pressing plate is adapted to extrude the battery cell. The buffer assembly can enable the battery cell to release expansive force.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular to a buffer component, a battery module, a battery device and electrical equipment. Background Art

[0002] The battery device usually includes a tray, a battery cell and other structures. The battery cell is arranged in the tray, and the frame, the middle beam and the like of the tray abut against the battery cell to generate a pre-tightening force to fix the battery cell.

[0003] The battery undergoes chemical reactions during the charge and discharge process, such as lithium ions being embedded in layered materials during the charge and discharge cycle of the battery cell, causing the electrode thickness to increase and the battery cell to expand, or gas to be generated when the SEI film is formed, causing the battery cell to expand.

[0004] The current method of fixing battery cells in trays secures the battery cells tightly, preventing them from expanding. Gas inside the battery cells accumulates locally, which may cause the battery cells to bulge and deform, and even pose a risk of fire and explosion in the battery device. Utility Model Content

[0005] The utility model aims to provide a buffer assembly, a battery module, a battery device and an electric device, so as to solve the problem that the battery device does not take the expansion of the battery core into consideration.

[0006] In order to achieve the purpose of the utility model, the utility model provides the following technical solutions:

[0007] In a first aspect, the utility model provides a buffer assembly for a battery device, comprising:

[0008] Pedestal;

[0009] A buffer member, disposed on the base;

[0010] A pressing plate, arranged on a side of the buffer member facing away from the base;

[0011] The buffer member is suitable for being deformed to enable the pressing plate to move relative to the base, and the pressing plate is suitable for pressing the battery core.

[0012] In one embodiment, the base includes a bottom plate and a side plate, the bottom plate and the side plate are enclosed to form a receiving space, and the buffer member is at least partially received in the receiving space.

[0013] In one embodiment, the side panel includes a first side surface and a first top surface, one end of the first side surface is connected to the bottom plate, one end of the first side surface away from the bottom plate is connected to the first top surface, and a chamfer is provided at the connection between the first side surface and the first top surface.

[0014] In one embodiment, the buffer member includes an airbag and an air nozzle, wherein the air nozzle is disposed at an end of the airbag close to the side plate, and the air nozzle is suitable for adjusting the volume of the airbag.

[0015] In one embodiment, the buffer assembly further includes a pressure sensor, which is disposed at the air nozzle and is suitable for measuring the pressure inside the airbag.

[0016] In one embodiment, the pressing plate is suitable for extending into the receiving space, and the pressing plate is slidably connected to the side plate.

[0017] In a second aspect, the utility model provides a battery module, comprising:

[0018] Battery cells;

[0019] The buffer assembly as described in any one of the first aspects, compresses the battery core.

[0020] In one embodiment, there are a plurality of battery cells, and the plurality of battery cells are arranged sequentially in a first direction, and the buffer component is arranged on at least one side of the plurality of battery cells in the first direction.

[0021] In a third aspect, the utility model provides a battery device, comprising the battery module as described in the second aspect.

[0022] In a fourth aspect, the utility model provides an electrical equipment, including an electrical device and a battery device as described in the third aspect, wherein the battery device supplies power to the electrical device.

[0023] The battery device of the utility model is provided with a buffer component, the base and the pressure plate of the buffer component can act as an expansion beam to limit the battery cell. When the battery cell expands during use, the battery cell presses the pressure plate, and the pressure plate applies pressure to the buffer component, so that the battery cell can release the expansion force and expansion deformation of the battery cell, thereby extending the service life of the battery cell. The buffer component can also provide a certain pre-tightening force for the battery cell to avoid excessive expansion of the battery cell, thereby improving the safety of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 is a three-dimensional diagram of a battery module of an embodiment;

[0026] Figure 2is a side view of a battery module of an embodiment;

[0027] Figure 3 is a cross-sectional view of a battery module according to an embodiment.

[0028] Description of reference numerals:

[0029] 100-battery module, 10-buffer assembly, 11-base, 111-bottom plate, 112-side plate, 1121-first side surface, 1122-first top surface, 1123-first side plate, 1124-third side plate, 113-accommodation space, 12-buffer, 121-air bag, 122-air nozzle, 13-pressing plate, 20-battery cell, 30-connecting row, X-first direction, Y-second direction. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0031] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there can be a central component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there can be a central component at the same time.

[0032] Unless otherwise defined, all technical and scientific terms used in this utility model have the same meaning as those commonly understood by technicians in the technical field of this utility model. The terms used in the specification of this utility model are only for the purpose of describing specific embodiments and are not intended to limit this utility model. The term "and / or" used in this utility model includes any and all combinations of one or more related listed items.

[0033] In conjunction with the accompanying drawings, some embodiments of the present invention are described in detail below. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0034] For reference Figure 1 The first direction X is the arrangement direction of the plurality of battery cells 20 , and the second direction Y intersects with the first direction X.

[0035] The utility model provides a battery device, including a battery module 100.

[0036] The battery device also includes a shell and a tray, the battery module 100 is accommodated in the shell, the shell is placed on the tray, and the shell, tray and buffer assembly 10 work together to limit the expansion of the battery cell 20. The tray is used to support and fix the battery module 100. The tray is usually made of metal or plastic materials, among which metal materials such as aluminum alloy and stainless steel have high strength and corrosion resistance, and are suitable for battery systems under high loads and harsh environments. Plastic materials such as nylon, polycarbonate, fiberglass, etc. have light weight and good insulation properties, and are suitable for some application scenarios with high weight and cost requirements. The shell mainly plays the role of protecting the battery module 100, preventing external impact, and preventing dust and water. The shell is usually made of metal or plastic materials, and metal materials include aluminum alloy, stainless steel, etc., without restriction.

[0037] There can be multiple battery modules 100, and the multiple battery modules 100 can be the same or different, without limitation. The battery modules 100 can be connected in series or in parallel, without limitation.

[0038] For reference Figure 1 The utility model provides a battery module 100 , including a battery cell 20 and a buffer component 10 . The buffer component 10 squeezes the battery cell 20 .

[0039] The battery cell 20 of the utility model can be a square battery, a round battery, a soft-pack battery cell 20, etc. Optionally, the battery cell 20 is a blade battery cell 20 among the square battery cells 20. The blade battery cell 20 has high packaging reliability, high volume utilization, and good heat dissipation performance, which effectively increases the space utilization of the battery device and improves the energy density of the battery device.

[0040] The buffer assembly 10 is connected and fixed to the outer shell of the battery device, the outer shell is placed on the tray, and the outer shell and the buffer assembly 10 work together to limit the expansion of the battery cell 20. The connection between the buffer assembly 10 and the outer shell can be screwed, clamped, bonded, etc., without limitation.

[0041] At present, most battery devices use metal plates as end plates, and do not consider the expansion of the battery cell 20 during later use. However, excessive expansion force of the battery cell 20 will affect the service life of the battery cell 20, and even cause deformation or damage to the end plate, causing safety problems. A small number of end plates absorb the expansion force and expansion deformation of the battery cell 20 through the buffer cavity, but cannot keep the expansion force of the battery cell 20 constant, nor can it be adjusted in the later stage as the battery SOH (power battery health status) changes.

[0042] The buffer component 10 is disposed at at least one end surface of the battery cell 20 . Optionally, the buffer component 10 is disposed in the direction of a large surface of the battery cell 20 .

[0043] The buffer assembly 10 is suitable for forming a frame with the outer shell of the battery device to limit the battery cell 20 , and the buffer assembly 10 can generate a pre-tightening force to fix the battery cell 20 .

[0044] For reference Figure 1 and Figure 2 In one embodiment, there are multiple battery cells 20, and the multiple battery cells 20 are arranged in sequence in the first direction X, and the buffer component 10 is arranged on one side of the multiple battery cells 20 in the first direction X.

[0045] The battery cell 20 includes a positive electrode sheet and a negative electrode sheet. The positive electrode sheet is usually made of materials such as lithium compounds and lithium cobalt oxide, while the negative electrode sheet is usually made of carbon materials such as graphite. During the charging and discharging process, lithium ions move back and forth between the two electrodes to complete the conversion and storage of electrical energy. Corresponding terminals are provided on the positive and negative electrodes of the battery cell 20 for connection. The positive and negative terminals of two adjacent battery cells 20 are electrically connected to realize the series connection of the battery cells 20.

[0046] The electrical connection method of the battery cell 20 can be welding connection, screw connection, plug connection, etc., without limitation. Specifically, the positive and negative terminals of the battery cell 20 are welded to the connecting piece or wire by spot welding equipment to form a reliable electrical connection. The welding method can be brazing, arc welding, laser welding, ultrasonic welding, etc.

[0047] Any two battery cells 20 are connected by a connector, which may be a connector sheet, a connector bar 30, a wire, etc., without limitation. Specifically, the connector bar 30 may be a copper bar, an aluminum bar, etc., without limitation. The connector bar 30 may realize electrical connection between the battery cells 20 and the battery cells 20, thereby forming the required series and parallel relationship. The connector bar 30 is directly connected to the battery cell 20 and may also serve as a sampling point for the voltage and temperature of the battery cell 20.

[0048] The connection method between the connection bar 30 and the battery cell 20 can be welding, bonding, etc. Specifically, welding is more firm and has a small connection resistance.

[0049] Optionally, the positive and negative electrodes of the battery cells 20 are arranged on different sides of the battery cells 20 in the second direction Y. Correspondingly, two connection rows 30 are required to connect three adjacent battery cells 20 , and the two connection rows 30 are arranged on different sides of the battery cells 20 .

[0050] The buffer assembly 10 is disposed at at least one end of the plurality of battery cells 20 in the first direction X. Optionally, the plurality of battery cells 20 are electrically connected in the first direction X to form a battery module 100 , and the buffer assembly 10 is disposed at two opposite ends of the battery module 100 in the first direction X.

[0051] The buffer assembly 10 and the housing are provided to limit the battery cell 20, which can effectively improve the structural stability of the battery device and protect the safety of the battery cell 20. The buffer assembly 10 is provided at the end of the battery module 100 in the first direction X, that is, the buffer assembly 10 limits the large surface of the battery cell 20, and the expansion of the battery cell 20 is mainly located on the large surface. Reasonable setting of the position of the buffer assembly 10 can reduce the weight of the battery module 100, which is conducive to improving the lightweight of the battery device.

[0052] For reference Figure 1 and Figure 3 The utility model provides a buffer assembly 10, which is used for a battery device. The buffer assembly 10 includes a base 11, a buffer member 12 and a pressure plate 13. The buffer member 12 is arranged on the base 11. The pressure plate 13 is arranged on the side of the buffer member 12 facing away from the base 11. The buffer member 12 is suitable for deformation so that the pressure plate 13 moves relative to the base 11, and the pressure plate 13 is suitable for squeezing the battery cell 20.

[0053] The buffer member 12 is detachably connected to the base 11 , and the connection method can be snap connection, screw connection, bonding, etc., without limitation.

[0054] The base 11 and the pressing plate 13 can be made of metal materials such as high-strength steel and aluminum alloy, so that the buffer assembly 10 has good strength, rigidity and corrosion resistance, and can ensure that the buffer assembly 10 bears the weight of the battery cell 20 during the assembly and use of the battery device, provides stable support and protection, and prevents the battery cell 20 from being damaged during vibration or collision. The buffer assembly 10 also has good thermal conductivity, so that the heat generated by the battery cell 20 during the charging and discharging process of the battery device can be effectively transferred to the external environment, preventing the battery cell 20 from overheating, and improving the heat dissipation efficiency and service life of the battery.

[0055] The battery device of the utility model is provided with a buffer component 10, and the base 11 and the pressure plate 13 of the buffer component 10 can act as an expansion beam to limit the battery cell 20. The battery cell 20 expands during use, and the battery cell 20 presses the pressure plate 13. The pressure plate 13 applies pressure to the buffer member 12, so that the battery cell 20 can release the expansion force and expansion deformation of the battery cell 20, thereby extending the service life of the battery cell 20. The buffer member 12 can also provide a certain pre-tightening force for the battery cell 20 to avoid excessive expansion of the battery cell 20, thereby improving the safety of the battery cell 20.

[0056] For reference Figure 1 and Figure 3 In one embodiment, the base 11 includes a bottom plate 111 and a side plate 112 , the bottom plate 111 and the side plate 112 enclose a receiving space 113 , and the buffer 12 is at least partially received in the receiving space 113 .

[0057] The pressing plate 13 is at least partially received in the receiving space 113 .

[0058] The base 11 may be an integrated structure, that is, the bottom plate 111 and the side plate 112 are an integrated structure made by an integrated molding process, and the integrated molding process may be stamping, casting, etc., without limitation. The base 11 may also be a split structure, and the side plate 112 and the bottom plate 111 may be connected and fixed by welding, bonding, clamping, screwing, etc. The wall thickness of each part of the base 11 may be roughly uniform, that is, the thickness of the side plate 112 may be roughly uniform, and the thickness of the bottom plate 111 and the side plate 112 may also be roughly the same.

[0059] Specifically, the side plate 112 includes a first side plate 1123 , a second side plate, a third side plate 1124 and a fourth side plate which are connected in sequence, wherein the first side plate 1123 and the third side plate 1124 are arranged opposite to each other in the second direction Y.

[0060] The base 11 is connected and fixed to the outer shell of the battery device. The base 11 is suitable for limiting the position of the battery cell 20 so that the battery cell 20 does not significantly move during the expansion process.

[0061] The buffer 12 is connected and fixed to the bottom plate 111 of the base 11, and the expansion force released by the battery cell 20 presses the buffer 12 in the first direction X. A receiving space 113 is provided to receive the buffer 12, and the receiving space 113 can also serve as a buffer cavity to absorb the expansion force and expansion deformation of the battery cell 20, so as to prevent the expansion force of the battery cell 20 from being too large and affecting the service life of the battery cell 20.

[0062] For reference Figure 1 and Figure 3 In one embodiment, the side panel 112 includes a first side surface 1121 and a first top surface 1122, one end of the first side surface 1121 is connected to the bottom plate 111, and the end of the first side surface 1121 away from the bottom plate 111 is connected to the first top surface 1122, and a chamfer is provided at the connection between the first side surface 1121 and the first top surface 1122.

[0063] According to different processing methods and shapes, chamfering can be divided into triangular chamfering, step chamfering, arc chamfering and corner chamfering, etc. Optionally, chamfering is performed using a chamfering machine.

[0064] Correspondingly, the distance between the ends of the two opposite side plates 112 away from the bottom plate 111 is greater than the distance between the ends of the side plates 112 connected to the bottom plate 111 .

[0065] The chamfer is provided to facilitate the installation of the pressure plate 13 in the buffer assembly 10, making the assembly and disassembly of the buffer assembly 10 more convenient.

[0066] For reference Figure 3 In one embodiment, the buffer member 12 includes an airbag 121 and an air nozzle 122 . The air nozzle 122 is disposed at an end of the airbag 121 close to the side plate 112 . The air nozzle 122 is suitable for adjusting the volume of the airbag 121 .

[0067] The airbag 121 can be made of nylon, rubber, polyurethane, etc. without limitation.

[0068] Specifically, a suitable preset value is selected according to the health status of the power battery of the battery cell 20, and then gas is injected into the airbag 121 through the air nozzle 122 to change the pressure inside the airbag 121. In addition, when the battery cell 20 expands and the pressure plate 13 squeezes the airbag 121, the air nozzle 122 can also play a role in limiting the separation of the airbag 121.

[0069] The medium filled in the airbag 121 may be nitrogen, water or air. Correspondingly, the gas or liquid enters the interior of the airbag 121 through the air nozzle 122. The device for providing gas may be an air compressor or the like.

[0070] The air nozzle 122 can be accommodated in the receiving space 113, and the air nozzle 122 can also be arranged on the side of the side plate 112 facing away from the receiving space 113, without limitation. Optionally, when the air nozzle 122 is arranged on the side of the side plate 112 facing away from the receiving space 113, it is convenient for users to operate to change the volume of the airbag 121.

[0071] The buffer member 12 further includes a connecting rod, which is disposed at both ends of the airbag 121 in the second direction Y, and is used to be connected and fixed with the first side plate 1123 and the third side plate 1124. There can be one connecting rod, which passes through the airbag 121, or there can be two connecting rods, which are respectively disposed at the two ends of the airbag 121 in the second direction Y. The connection method of the connecting rod and the first side plate 1123 and the third side plate 1124 can be screw connection, clamping connection, bonding, etc., without limitation.

[0072] The airbag 121 is provided as the buffer 12, so that the contact surface of the battery cell 20 and the pressure plate 13 is subjected to a more uniform force, thereby extending the service life of the battery cell 20. The existing buffer components 10 provided with a buffer cavity are mostly fixed structures, which cannot be modified and adjusted later, and the expansion of the battery cell 20 at different life stages is inconsistent. The buffer component 10 of the utility model can adjust the volume of the airbag 121 through the air nozzle 122 to adjust the preload force of the battery cell 20, so that the battery cell 20 has the most suitable preload force at different life stages.

[0073] In one embodiment, the buffer assembly 10 further includes a pressure sensor, which is disposed at the air nozzle 122 , and is suitable for measuring the pressure inside the airbag 121 .

[0074] The component for measuring pressure in the pressure sensor may be a mercury barometer, a metal box barometer, etc., without limitation.

[0075] The existing technology cannot monitor the expansion force of the battery cell 20. The buffer assembly 10 of the utility model integrates a pressure sensor at the air nozzle 122, which can detect the air pressure inside the airbag 121 in real time, so as to predict and monitor the battery status and avoid accidents. If the pressure inside the airbag 121 measured by the pressure sensor is greater than the preset value, the pressure sensor sends a signal to the terminal, indicating that the expansion deformation of the battery cell 20 is too large, and there may be risks such as bulging of the battery cell 20, circuit failure, explosion and fire, which need to be checked in time. The terminal can be a computer, mobile phone, etc., without limitation.

[0076] In one embodiment, the pressing plate 13 is adapted to extend into the receiving space 113, and the pressing plate 13 is slidably connected to the side plate 112. The pressing plate 13 and the inner wall surface of the side plate 112 slide relative to each other.

[0077] The specific form of sliding connection can be a guide structure, that is, a groove is opened on the inner wall surface of the side plate 112, and the number of the grooves can be one or more. The pressure plate 13 is provided with a corresponding number of protrusions in the second direction Y, and the protrusions are suitable for extending into the interior of the groove. The guide structure is provided to facilitate the disassembly and assembly of the pressure plate 13 and the base 11.

[0078] The pressure plate 13 is suitable for closing the receiving space 113. On the one hand, it is convenient for assembling and disassembling the buffer assembly 10. On the other hand, the battery cell 20 squeezes the pressure plate 13 after expansion. If the expansion deformation of the battery cell 20 is too large, the pressure plate 13 slides relative to the side plate 112, thereby squeezing the airbag 121, so that the pressure inside the airbag 121 increases.

[0079] The utility model provides an electric device, including an electric device and a battery device, wherein the battery device supplies power to the electric device. The electric device may be a washing machine, a television, etc., and the electric device may be a transformer, a light bulb, etc., without limitation.

[0080] Specifically, an assembly method of a battery device according to an embodiment of the utility model is: connect and fix the buffer component 10 to the outer shell of the battery device; sequentially install the battery cells 20 between the buffer components 10 relatively arranged in the first direction X; weld the connecting row 30 and the battery cells 20 to realize the electrical connection of the battery cells 20; arrange the airbag 121 and the pressure plate 13 in the receiving space 113; use an air compressor to inject the medium into the airbag 121 of the buffer component 12 until the pressure sensor shows that the pressure in the airbag 121 is less than or equal to the preset value; and the battery device is assembled.

[0081] The battery device of the utility model is provided with a buffer component 10. The bottom plate 111 and the side plate 112 of the base 11 of the buffer component 10 enclose a receiving space 113. In addition to receiving the buffer member 12 and the pressure plate 13, the receiving space 113 can also serve as a buffer chamber to release the expansion force and expansion deformation of the battery cell 20; using the airbag 121 as a part of the buffer member 12 can make the force on the end face of the battery cell 20 more uniform, thereby extending the service life of the battery cell 20; the buffer member 12 is provided with an air nozzle 122 to adjust the volume of the airbag 121, thereby adjusting the preload force on the battery cell 20, so that the battery cell 20 has a suitable preload force at different life stages, which is beneficial to improving the life of the battery cell 20; a pressure sensor is provided to detect the pressure inside the airbag 121, indirectly reflect the expansion of the battery cell 20, predict and monitor the status of the battery cell 20, and avoid accidents.

[0082] In the description of the embodiments of the present invention, it should be noted that the orientation or positional relationship of terms such as "center", "up", "down", "left", "right", "vertical", "horizontal", "inside" and "outside" are based on the orientation or positional relationship described in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0083] The above disclosure is only a preferred embodiment of the present invention, and certainly cannot be used to limit the scope of rights of the present invention. Ordinary technicians in this field can understand that all or part of the processes of the above embodiment and equivalent changes made according to the claims of the present invention still fall within the scope covered by the present invention.

Claims

1. A buffer assembly for a battery device, characterized in that: include: A base, including a bottom plate and side plates; A buffer member, disposed on the base; A pressing plate, arranged on a side of the buffer member facing away from the base; The buffer member is suitable for deforming to enable the pressing plate to move relative to the base, and the pressing plate is suitable for squeezing the battery core; The buffer component includes an air bag and an air nozzle. The air nozzle is arranged at the end of the air bag close to the side plate, and the air nozzle is suitable for adjusting the volume of the air bag.

2. The buffer assembly according to claim 1, characterized in that: The bottom plate and the side plate are enclosed to form a receiving space, and the buffer component is at least partially received in the receiving space.

3. The buffer assembly according to claim 2, characterized in that: The side plate includes a first side surface and a first top surface, one end of the first side surface is connected to the bottom plate, one end of the first side surface away from the bottom plate is connected to the first top surface, and a chamfer is provided at the connection between the first side surface and the first top surface.

4. The buffer assembly according to claim 1, characterized in that: The buffer assembly further includes a pressure sensor, which is disposed at the air nozzle and is suitable for measuring the pressure inside the airbag.

5. The buffer assembly according to claim 2, characterized in that: The pressing plate is suitable for extending into the receiving space, and the pressing plate is slidably connected with the side plate.

6. A battery module, characterized in that: include: Battery cells; The buffer assembly according to any one of claims 1 to 5, wherein the battery core is extruded.

7. The battery module according to claim 6, characterized in that: There are a plurality of battery cells, and the plurality of battery cells are arranged in sequence in a first direction. The buffer component is arranged on at least one side of the plurality of battery cells in the first direction.

8. A battery device, characterized in that: Comprising the battery module as claimed in claim 6 or 7.

9. An electrical device, characterized in that: The invention comprises an electric device and the battery device as claimed in claim 8, wherein the battery device supplies power to the electric device.

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