Battery device and energy storage equipment
By incorporating insulating spacers and strapping intervals between battery modules, the problem of thermal runaway propagation in battery modules is solved, achieving cost-effective thermal runaway protection and improving the safety and reliability of the battery device.
Patent Information
- Application Number
- CN202423183275.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-23
- Publication Date
- 2026-01-27
- Estimated Expiration
- 2034-12-23
AI Technical Summary
When a battery module experiences thermal runaway, the heat propagation can easily lead to the failure of the entire battery device, or even cause a fire or explosion. Existing multi-layer protection structures are complex and costly.
The design employs an insulating spacer and a strap to separate adjacent battery modules, preventing heat spread and avoiding short circuits. The insulating spacer and the strap do not contact each other to reduce cost and breakage risk.
It effectively prevents the spread of thermal runaway, reduces costs, improves assembly efficiency, avoids excessive protection and waste of resources, and enhances safety and reliability.
Smart Images
Figure CN223842992U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of battery technology, and more particularly to a battery device and an energy storage device. Background Technology
[0002] Battery devices can be used to store or provide electrical energy, and they can be used in energy storage equipment. With the rapid increase in both installed capacity and growth rate, large-scale electrochemical energy storage projects at the megawatt level have become commonplace. In this context, safety has become a core constraint on the large-scale promotion and application of energy storage. Among these, thermal runaway is the main cause affecting the safe operation of energy storage power stations.
[0003] In related technologies, battery devices include at least two battery modules, each containing a single battery cell. If a single battery cell experiences thermal runaway, adjacent cells within the battery module will also experience thermal runaway under the influence of heat. Thermal runaway can easily spread between multiple battery modules, leading to battery device failure. In severe cases, it can even cause the entire battery device to ignite, ultimately resulting in a fire or even an explosion at the energy storage power station. Therefore, thermal runaway protection of battery modules is not only related to the safe operation of energy storage power stations but is also a key measure to ensure personnel safety. Utility Model Content
[0004] In view of this, embodiments of this application aim to provide a battery device and an energy storage device, wherein an insulating separator is used to insulatingly isolate two adjacent battery modules.
[0005] To achieve the above objectives, the technical solution of this application embodiment is implemented as follows:
[0006] This application provides a battery device, including:
[0007] At least two battery modules, each battery module including a strap and a battery cell assembly, each battery cell assembly including at least two stacked battery cells, the straps surrounding the outer periphery of the battery cell assembly to secure the battery cell assembly, and the at least two battery modules arranged side by side in sequence;
[0008] An insulating separator is provided on at least one of the two opposite sidewalls of two adjacent battery modules, the insulating separator being spaced apart from the strap.
[0009] The battery device provided in this application embodiment includes an insulating spacer used to isolate two adjacent battery modules. If a single cell in one of the battery modules experiences thermal runaway, the insulating spacer can not only prevent heat from spreading between the two adjacent battery modules, thus preventing further thermal runaway, but also isolate the individual cells of the adjacent battery modules, preventing short circuits between the cells and achieving thermal runaway protection. The insulating spacer is spaced apart from the strapping. On the one hand, the size of the insulating spacer can be relatively small, reducing its cost to some extent; on the other hand, the insulating spacer and the strapping do not contact each other, avoiding the risk of damage or falling off the insulating spacer due to repeated friction between the strapping and the insulating spacer in the event of expansion of the battery cell during use.
[0010] In some embodiments, each of the battery modules has two straps spaced apart along the top-bottom direction, and the insulating spacer is located between the two straps.
[0011] In this embodiment, the two straps are spaced apart along the top and bottom direction to more stably bind the battery cell assembly and better constrain the battery cells. An insulating spacer is located between the two straps, spaced apart from both straps. With a relatively small size, the insulating spacer can effectively isolate two adjacent battery modules.
[0012] In some embodiments, the distance between the strap and the insulating barrier is L, where 0 mm < L ≤ 2.5 mm.
[0013] In this embodiment, the spacing between the strap and the insulating separator is moderate, and the size of the insulating separator is moderate, which can take into account both the needs and cost requirements of insulating and isolating two adjacent battery modules.
[0014] In some embodiments, the insulating spacer is flush with or protrudes from at least one end of the battery cell assembly along the stacking direction.
[0015] In this embodiment, the insulating spacer is flush with or protrudes from at least one end of the battery cell assembly along the stacking direction. In the stacking direction of the battery cells, the insulating spacer can basically cover all the battery cells, thereby improving reliability.
[0016] In some embodiments, the insulating spacer has a single-layer structure; and / or, the insulating spacer is bonded to the sidewall of the battery module.
[0017] In this embodiment, the insulating separator has a single-layer structure. The insulating separator has a simple structure, and during the assembly process to the battery module, taking the bonding of the insulating separator to the side wall of the battery module as an example, the assembly of the insulating separator and the battery module can be completed in one bonding step, without the need for multiple bonding steps with multiple layers of insulating separators, thus improving assembly efficiency. Furthermore, a single-layer insulating separator can isolate two adjacent battery modules, saving materials, reducing costs, and avoiding resource waste caused by excessive protection. Bonding facilitates a large-area, stable fixation of the insulating separator to the side wall of the battery module.
[0018] In some embodiments, the strap includes an annular body and an insulating layer, the insulating layer wrapping around the annular body, with a plane perpendicular to the arrangement direction of the battery module as the projection plane, and the projection of the insulating layer coincides with the projection of the battery cell assembly.
[0019] In this embodiment, the insulating sheath wraps around the annular body. The insulating sheath may wrap around part or all of the structure of the annular body. The insulating sheath is non-conductive. With the plane perpendicular to the arrangement direction of the battery module as the projection plane, the projection of the insulating sheath coincides with the projection of the battery cell assembly. The insulating sheath can insulate and isolate the annular body and the battery cell.
[0020] In some embodiments, the strap includes a heat-resistant layer disposed between the annular body and the insulating sheath, wherein the heat-resistant layer melts at a temperature higher than that of the insulating sheath.
[0021] In this embodiment, the melting temperature of the heat-resistant layer is higher than that of the insulating sheath. If the battery cell experiences thermal runaway, and the insulating sheath melts under high temperature, the melting temperature of the heat-resistant layer is higher than that of the insulating sheath. The heat-resistant layer can still maintain its shape under high temperature conditions and can still effectively isolate the battery cell from the ring body, thereby preventing the battery cell from contacting the ring body and short-circuiting, thus preventing further deterioration of thermal runaway.
[0022] In some embodiments, the battery module includes two end plates disposed at both ends of the battery cell assembly along the stacking direction. The annular body includes two first segments and two second segments, with the two second segments respectively connecting the two first segments to form the annular body. The two first segments are located at the locations of the two end plates, and the two second segments are located at the locations of the battery cell assembly. The insulating sheath covers at least two of the second segments.
[0023] In this embodiment, two end plates abut against two battery cells at both ends of the battery cell assembly along the stacking direction. Two first segments are located at the two end plates. The end plates are usually insulated structures. The first segments can contact the end plates and may not be wrapped with an insulating layer. Two second segments are located at the battery cell assembly. The insulating layer covers at least two second segments and contacts the battery cell assembly to provide insulation protection.
[0024] In some embodiments, the heat-resistant layer comprises a ceramicized silicone rubber structure or a metal oxide structure; and / or, the insulating cladding comprises a mica paper structure or a ceramic structure.
[0025] In this embodiment, the ceramicized silicone rubber structure and the metal oxide structure possess excellent insulation properties. Furthermore, the melting temperature of both structures is relatively high. Using these structures in the heat-resistant layer ensures that it does not melt under thermal runaway temperatures. The insulating cladding includes a mica paper structure or a ceramic structure. Both structures offer good insulation and heat resistance, and employing either structure balances these requirements.
[0026] In some embodiments, the battery device includes an insulating shield that at least covers the top wall of all the battery modules.
[0027] In this embodiment, the insulating shielding member covers at least the top wall of all battery modules, and the insulating shielding member can achieve common protection for all battery modules.
[0028] In some embodiments, the insulating shielding member includes a plate and two folded edges, the plate covering the top wall of all the battery modules, and the two folded edges being disposed at both ends of the plate along the arrangement direction of the battery modules, the folded edges extending from the plate toward the bottom side.
[0029] In this embodiment, the plate can provide insulation for the top walls of all battery modules, and the two folded edges can provide protection for the battery modules at both ends of the arrangement direction.
[0030] In some embodiments, the insulating shielding element has a single-layer structure.
[0031] In this embodiment, during the assembly of the insulating shielding component into the battery module, taking the bonding of the insulating shielding component to the top wall of the battery module as an example, the assembly of the insulating shielding component and all battery modules can be completed in one bonding process, without the need to bond multiple layers of insulating shielding components, thus improving assembly efficiency. Moreover, a single-layer insulating shielding component can save materials, reduce costs, and avoid resource waste caused by excessive protection.
[0032] In some embodiments, the insulating insulating element melts at a temperature higher than 400°C.
[0033] In this embodiment, when a battery cell experiences thermal runaway, the insulating separator does not melt at the thermal runaway temperature and can still maintain its shape, thus improving the reliability of protection.
[0034] In some embodiments, the insulating insulating element comprises a mica paper structure or a ceramic structure.
[0035] In this embodiment, the mica paper structure and the ceramic structure have good insulation and heat resistance properties. The insulating insulating component adopts either the mica paper structure or the ceramic structure, which can meet both insulation and heat resistance requirements.
[0036] This application also provides an energy storage device, including the battery device described in any one of the above-mentioned embodiments, wherein the battery device is used to store or provide electrical energy. Attached Figure Description
[0037] Figure 1 This is a schematic diagram of the explosion and disassembly of a battery device in one embodiment of this application;
[0038] Figure 2 This is a schematic diagram of the battery module and insulating separator in one embodiment of this application;
[0039] Figure 3 for Figure 2 A schematic diagram of the structure shown from another perspective;
[0040] Figure 4 for Figure 3 Schematic diagram of cross-section along the middle AA direction;
[0041] Figure 5 for Figure 4 Enlarged view of point B in the middle;
[0042] Figure 6 This is a schematic diagram of the structure of the insulating isolation member in one embodiment of this application;
[0043] Figure 7 This is a partial cross-sectional view of the strap in one embodiment of this application.
[0044] Explanation of reference numerals in the attached figures
[0045] 100. Battery assembly; 1. Battery module; 101. Side wall; 102. Top wall; 11. Battery cell assembly; 111. Battery cell; 12. Strap; 121. Ring body; 1211. First section; 1212. Second section; 122. Insulating layer; 123. Heat-resistant layer; 13. End plate; 2. Insulating separator; 3. Insulating shield; 31. Plate; 32. Folded edge. Detailed Implementation
[0046] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.
[0047] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit this application.
[0048] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly indicating the number, specific order, or primary and secondary relationship of the indicated technical features.
[0049] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.
[0050] It should be noted that in this application, "at least two" refers to a quantity of two or more. "Multiple" refers to a quantity of two or more. The unit "mm" is millimeter. The stacking direction, arrangement direction, and top-bottom direction are mutually perpendicular. The stacking direction is represented by X, the arrangement direction by Y, and the top-bottom direction by Z. The top and bottom are two sides opposite to each other in the top-bottom direction. The top is represented by Z1, and the bottom by Z2.
[0051] Please see Figures 1 to 3 To facilitate understanding of the battery cell 111, battery device 100, and energy storage device provided in the embodiments of this application, some basic structures of the battery cell 111, battery device 100, and energy storage device provided in the embodiments of this application will be introduced first.
[0052] In this embodiment of the application, the battery cell 111 can be a secondary battery. A secondary battery refers to a battery cell 111 that can be used again after being discharged by recharging to activate the active materials.
[0053] The battery cell 111 can be a lithium-ion battery cell 111, a sodium-ion battery cell 111, a sodium-lithium-ion battery cell 111, a lithium metal battery cell 111, a sodium metal battery cell 111, a lithium-sulfur battery cell 111, a magnesium-ion battery cell 111, a nickel-metal hydride battery cell 111, a nickel-cadmium battery cell 111, or a lead-acid battery cell 111, etc., and the embodiments of this application are not limited to this.
[0054] Multiple battery cells 111 can be connected in series, parallel, or mixed via a busbar. The busbar is used to achieve electrical connection between at least two battery cells 111.
[0055] For example, "hybrid connection" refers to at least two battery cells 111 that are connected in both series and parallel. At least two battery cells 111 can be directly connected in series, parallel, or hybrid connections; of course, at least two battery cells 111 can first be connected in series, parallel, or hybrid connections to form a module, and then the module can be connected in series, parallel, or hybrid connections to form a whole.
[0056] A single battery cell 111 typically includes an electrode assembly, which comprises a positive electrode, a negative electrode, and a separator, with the separator positioned between the negative and positive electrodes. During the charging and discharging process of the battery cell 111, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, serves to prevent short circuits between the electrodes while allowing active ions to pass through.
[0057] The electrode assembly can be a wound structure, a stacked structure, or a hybrid structure of wound and stacked.
[0058] In some implementations, the electrode assembly can be cylindrical, flat, or polygonal, etc.
[0059] In some implementations, the electrode assembly has tabs that allow current to be drawn out of the electrode assembly. The tabs include a positive tab and a negative tab.
[0060] In some embodiments, the battery cell 111 may include a casing. The casing may be a steel casing, an aluminum casing, a plastic casing (such as a polypropylene casing), a composite metal casing (such as a copper-aluminum composite casing), or an aluminum-plastic film, etc.
[0061] In some embodiments, the housing can be a sealed structure or a non-sealed structure. As an example, when the housing is a non-sealed structure, it serves to protect the electrode assembly, and a sealing bag is included between the housing and the electrode assembly to encapsulate the electrode assembly and electrolyte. Specifically, the sealing bag can be a bag-shaped insulating component or an aluminum-plastic film. When the housing is a sealed structure, it is used to encapsulate components such as the electrode assembly and electrolyte.
[0062] As an example, the battery cell 111 can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic battery cells, such as hexagonal prismatic battery cells. This application does not have any particular limitations.
[0063] In some embodiments, the housing includes an end cap and a housing, the housing having an opening, and the end cap covering the opening. The housing may have one or more openings. The end cap may also have one or more.
[0064] In some embodiments, at least one electrode terminal is provided on the housing, and the electrode terminal is electrically connected to the tab. The electrode terminal can be directly connected to the tab, or it can be indirectly connected to the tab through a current collector. The electrode terminal can be provided on the end cap or on the housing.
[0065] In some embodiments, a pressure relief mechanism is provided on the casing. The pressure relief mechanism is used to release the internal gas of the battery cell 111.
[0066] As an example, the internal pressure or temperature of the battery cell 111 is actuated to release the internal pressure or temperature when it reaches a predetermined threshold. When the internal pressure or temperature of the battery cell 111 reaches the predetermined threshold, the pressure relief mechanism is activated or a weak structure in the pressure relief mechanism is destroyed, thereby forming an opening or channel for the internal pressure or temperature to be released. The threshold design varies depending on the design requirements. The threshold may depend on the materials of one or more of the positive electrode, negative electrode, electrolyte, and separator in the battery cell 111.
[0067] Please see Figure 1 This application provides an energy storage device, which includes a battery device 100 as described in any embodiment of this application. The battery device 100 is used to store or provide electrical energy.
[0068] Energy storage devices can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems, or temporary power supply systems. Energy storage devices can store electrical energy as needed and output it when appropriate. For example, energy storage devices can store electrical energy during off-peak hours and provide power to relevant users or electrical equipment during peak hours. The energy storage system provided in this application embodiment can be any power system that requires energy storage devices.
[0069] In some embodiments, the energy storage device is an energy storage container or an energy storage cabinet.
[0070] The energy storage device may include a cabinet with a battery compartment, in which the battery unit 100 is housed.
[0071] The cabinet can provide protection for the battery device 100. The shape of the cabinet is not limited; for example, the cabinet can be hexahedral, such as cuboid or cube, etc.
[0072] At least two battery devices 100 can form a battery cluster, and the energy storage device includes one or more battery clusters. Battery clusters are used to increase the voltage and capacity of the energy storage device. Multiple battery devices 100 can be connected in series via a busbar to increase the voltage of the energy storage device. When the energy storage device includes multiple battery clusters, the multiple battery clusters can be connected in parallel to increase the capacity of the energy storage device.
[0073] In some embodiments, the energy storage device may include modules such as a main control module, a central control module, a power distribution module, and a fire protection module.
[0074] As an example, the main control module can serve as the battery management unit for the battery cluster, used to monitor and manage the battery cluster. The main control module can monitor information such as the current, voltage, power, or temperature of the battery cluster. For instance, it can control the charging and discharging current and voltage of the battery cluster. The main control module includes modules such as an auxiliary battery management unit (SBMU) and a fusion switch.
[0075] As an example, the central control module can serve as the battery management unit for an energy storage device, used to monitor and manage the device. The central control module can monitor information such as the device's current, voltage, power, state of charge, and temperature. For instance, it can control the charging and discharging current and voltage of the energy storage device. As an example, the central control module includes modules such as an Insulation Monitoring Module (IMM), a Master Battery Management Unit (MBMU), an Ethernet (ETH) module, and a fiber optic conversion module.
[0076] As an example, the fire protection module includes a control panel, detectors, alarm devices, etc., used to detect, alarm, or extinguish fires in energy storage equipment.
[0077] As an example, the power distribution module can be used to distribute power to the power modules of energy storage devices.
[0078] In related technologies, if a single battery cell experiences thermal runaway, it can easily spread to multiple battery modules. If a multi-layer protective structure is used to wrap the outside of the battery module, the protective structure is complex and costly. Each module needs to have multiple layers of protective structure bonded together, resulting in a slow production cycle. Furthermore, there are multiple layers of protective structure between battery modules, leading to over-protection.
[0079] In view of this, embodiments of this application provide a battery device, which includes an insulating separator and at least two battery modules. Each battery module includes a strap and a battery cell assembly. Each battery cell assembly includes at least two stacked battery cells. The strap surrounds the outer periphery of the battery cell assembly to secure it. The at least two battery modules are arranged side-by-side in sequence. An insulating separator is provided on at least one of the two opposite sidewalls of two adjacent battery modules, and the insulating separator is spaced apart from the strap.
[0080] The battery device provided in this application embodiment includes an insulating spacer used to isolate two adjacent battery modules. If a single cell in one of the battery modules experiences thermal runaway, the insulating spacer can not only prevent heat from spreading between the two adjacent battery modules, thus preventing further thermal runaway, but also isolate the individual cells of the adjacent battery modules, preventing short circuits between the cells and achieving thermal runaway protection. The insulating spacer is spaced apart from the strapping. On the one hand, the size of the insulating spacer can be relatively small, reducing its cost to some extent; on the other hand, the insulating spacer and the strapping do not contact each other, avoiding the risk of damage or falling off the insulating spacer due to repeated friction between the strapping and the insulating spacer in the event of expansion of the battery cell during use.
[0081] The battery device 100 provided in the embodiments of this application is further described below with reference to the accompanying drawings. Please refer to the accompanying drawings. Figures 1 to 3 This application provides a battery device 100, which includes an insulating separator 2 and at least two battery modules 1.
[0082] Please continue reading. Figures 1 to 3 The battery module 1 includes a strap 12 and a battery cell assembly 11. The battery cell assembly 11 includes at least two stacked battery cells 111. The strap 12 surrounds the outer periphery of the battery cell assembly 11 to bind the battery cell assembly 11. At least two battery modules 1 are arranged side by side in sequence. At least one of the two opposite sidewalls 101 of two adjacent battery modules 1 is provided with an insulating spacer 2, which is spaced apart from the strap 12.
[0083] At least two battery cells 111 are stacked, meaning that the large faces of at least two battery cells 111 are arranged in parallel. The large face of the battery cell 111 is the end face with the largest area of the battery cell 111, and the stacking direction X of the battery cells 111 is perpendicular to the large face of the battery cell 111.
[0084] The outer periphery of the battery cell assembly 11 is oriented around a straight line extending along the top-bottom direction Z.
[0085] The straps 12 surround the outer periphery of the battery cell assembly 11 to restrain the battery cell assembly 11. The straps 12 may be flexible to provide a tightening force. The straps 12 can restrain the battery cell assembly 11 to reduce the probability of the battery cell 111 shaking or shifting. The battery module 1 is formed by stacking multiple battery cells 111 and fixing them with straps 12 to form an independent module.
[0086] At least two battery modules 1 are arranged side by side in sequence, which means that at least two battery modules 1 are arranged in parallel in sequence. For example, at least two battery modules 1 can be arranged along a first direction, which is perpendicular to the stacking direction X.
[0087] At least one of the two opposing sidewalls 101 of two adjacent battery modules 1 is provided with an insulating spacer 2. Exemplarily, one of the two opposing sidewalls 101 of two adjacent battery modules 1 is provided with an insulating spacer 2, meaning one of the two sidewalls 101 has an insulating spacer 2, while the other sidewall 101 does not, and there is only one insulating spacer 2 between the two battery modules 1. Alternatively, two insulating spacers 2 may be provided on the two opposing sidewalls 101 of two adjacent battery modules 1, meaning there are two insulating spacers 2 between the two battery modules 1.
[0088] The insulating separator 2 is non-conductive and can isolate two adjacent battery modules 1. If a single battery cell 111 in one of the battery modules 1 experiences thermal runaway, the insulating separator 2 can prevent heat from spreading between the two adjacent battery modules 1, suppressing heat propagation and achieving the purpose of thermal runaway protection.
[0089] The insulating spacer 2 is spaced apart from the strap 12. In other words, the insulating spacer 2 does not contact the strap 12. With this design, on the one hand, the size of the insulating spacer 2 can be relatively small, which reduces the cost of the insulating spacer 2 to a certain extent; on the other hand, since the insulating spacer 2 and the strap 12 do not contact each other, if the battery cell 111 expands during use, the risk of the insulating spacer 2 being damaged or falling off due to repeated friction of the strap 12 with the insulating spacer 2 is avoided.
[0090] The battery device 100 provided in this application embodiment includes an insulating separator 2 used to isolate two adjacent battery modules 1. If a battery cell 111 in one of the battery modules 1 experiences thermal runaway, the insulating separator 2 can not only prevent heat from spreading between the two adjacent battery modules 1, thus preventing further spread of thermal runaway to a certain extent, but also isolate the battery cells 111 in adjacent battery modules 1, preventing short circuits between the battery cells 111 in adjacent battery modules 1, thereby achieving the purpose of thermal runaway protection. The insulating separator 2 is spaced apart from the strap 12. On the one hand, the size of the insulating separator 2 can be relatively small, reducing the cost of the insulating separator 2 to a certain extent; on the other hand, the insulating separator 2 and the strap 12 do not contact each other, avoiding the risk of damage or falling off the insulating separator 2 due to repeated friction between the strap 12 and the insulating separator 2 in the event of expansion of the battery cell 111 during use.
[0091] The shape of the insulating spacer 2 is not limited; for example, the insulating spacer 2 can be generally flat. This facilitates the fitting of the insulating spacer 2 to the sidewall 101 of the battery module 1.
[0092] In some embodiments, the insulating separator 2 melts at a temperature higher than 400°C. That is, the insulating separator 2 does not melt below 400°C. In the event of thermal runaway of the battery cell 111, the insulating separator 2 does not melt at the thermal runaway temperature and can still maintain its shape, thus improving the reliability of protection.
[0093] It should be noted that, in the embodiments of this application, the melting temperature refers to the temperature at which the structure changes from a solid to a liquid state.
[0094] In some embodiments, the insulating separator 2 includes a mica paper structure or a ceramic structure. A mica paper structure refers to a structure made of mica paper. A ceramic structure refers to a structure made of ceramic. Both mica paper and ceramic structures have good insulation and heat resistance properties, and using either a mica paper or ceramic structure for the insulating separator 2 can meet both insulation and heat resistance requirements.
[0095] The insulating isolation component 2 can be made of other insulating materials. Preferably, the insulating isolation component 2 can be made of materials with good insulation and heat insulation properties.
[0096] It is understood that the number of insulating spacers 2 can be one or more, and the number of insulating spacers 2 provided in a single battery module 1 can be zero, one, or two. There can be one or two insulating spacers 2 between two adjacent battery modules 1.
[0097] In some embodiments, please refer to Figures 1 to 3 Each battery module 1 has two straps 12, which are spaced apart along the top-bottom direction Z, and an insulating separator 2 is located between the two straps 12.
[0098] In this embodiment, the two straps 12 are spaced apart along the top-bottom direction Z to more stably bind the battery cell assembly 11 and better constrain the battery cell 111. The insulating spacer 2 is located between the two straps 12, and the insulating spacer 2 is spaced apart from both straps 12. With the insulating spacer 2 being relatively small in size, it can effectively isolate two adjacent battery modules 1.
[0099] In some embodiments, please refer to Figure 5 The distance between the binding strap 12 and the insulating insulating member 2 is L, where 0mm < L ≤ 2.5mm. Specifically, the distance between the binding strap 12 and the insulating insulating member 2 refers to the distance between the binding strap 12 and the insulating insulating member 2 along the top-bottom direction Z.
[0100] For example, L can be 0.5mm, 1mm, 1.2mm, 1.5mm, 2mm, or 2.5mm, etc. Preferably, 0mm < L ≤ 2mm. That is, L can be greater than 0mm and less than or equal to 2mm.
[0101] In this embodiment, the distance between the strap 12 and the insulating separator 2 is moderate, and the size of the insulating separator 2 is moderate, which can take into account both the needs and cost requirements of insulating and isolating two adjacent battery modules 1.
[0102] In some embodiments, the insulating spacer 2 is flush with or protrudes from at least one end of the battery cell assembly 11 along the stacking direction X.
[0103] For example, the insulating spacer 2 being flush with one end of the battery cell assembly 11 along the stacking direction X means that the insulating spacer 2 can be flush with one end of the battery cell assembly 11 along the stacking direction X, but the insulating spacer 2 may not be flush with the other end of the battery cell assembly 11 along the stacking direction X. For example, the insulating spacer 2 may protrude or be shorter than the other end of the battery cell assembly 11 along the stacking direction X.
[0104] For example, the insulating spacer 2 can be flush with both ends of the battery cell assembly 11 along the stacking direction X, that is, the size of the insulating spacer 2 along the stacking direction X can be equal to the size of the battery cell assembly 11 along the stacking direction X.
[0105] For example, the insulating spacer 2 protruding from one end of the battery cell assembly 11 along the stacking direction X means that the insulating spacer 2 may protrude from one end of the battery cell assembly 11 along the stacking direction X, but the insulating spacer 2 may not protrude from the other end of the battery cell assembly 11 along the stacking direction X. For example, the insulating spacer 2 may be flush with or shorter than the other end of the battery cell assembly 11 along the stacking direction X.
[0106] For example, the insulating spacer 2 may protrude from both ends of the battery cell assembly 11 along the stacking direction X. That is, the size of the insulating spacer 2 along the stacking direction X may be larger than the size of the battery cell assembly 11 along the stacking direction X.
[0107] In this embodiment, the insulating spacer 2 is flush with or protrudes from at least one end of the battery cell assembly 11 along the stacking direction X. In the stacking direction X of the battery cells 111, the insulating spacer 2 can basically cover all the battery cells 111, thereby improving reliability.
[0108] In some embodiments, the distance by which the insulating spacer 2 protrudes from one end of the battery cell assembly 11 along the stacking direction X can be D, where 0 mm < D ≤ 10 mm. Preferably, 0 mm < D ≤ 5 mm.
[0109] For example, D can be 0.5mm, 1mm, 3mm, 5mm, 8mm, 9mm, or 10mm, etc.
[0110] In some embodiments, the insulating spacer 2 may extend to the end plate 13 in the stacking direction X; for example, the insulating spacer 2 may be bonded to the end plate 13.
[0111] In this embodiment, the distance between the insulating separator 2 protruding from one end of the battery cell assembly 11 along the stacking direction X is no more than 10mm, which can not only improve the reliability of insulation protection, but also control the cost to be relatively reasonable.
[0112] In some embodiments, the insulating spacer 2 is bonded to the sidewall 101 of the battery module 1. Bonding facilitates a large-area, stable fixation of the insulating spacer 2 to the sidewall 101 of the battery module 1.
[0113] For example, the insulating separator 2 and the sidewall 101 of the battery module 1 can be bonded together with glue or double-sided adhesive.
[0114] In some embodiments, please refer to Figure 6 The insulating insulating component 2 has a single-layer structure. A single-layer structure refers to a structure consisting of one layer of material, not multiple layers.
[0115] In this embodiment, the insulating separator 2 has a simple structure. During the assembly of the insulating separator 2 to the battery module 1, taking the bonding of the insulating separator 2 to the side wall 101 of the battery module 1 as an example, the assembly of the insulating separator 2 and the battery module 1 can be completed in one bonding step, without the need for multiple bonding steps of multiple layers of insulating separator 2, thus improving assembly efficiency. Furthermore, a single layer of insulating separator 2 can isolate two adjacent battery modules 1, saving materials, reducing costs, and avoiding resource waste caused by excessive protection.
[0116] In some embodiments, please refer to Figures 3 to 7The strap 12 includes an annular body 121 and an insulating layer 122. The insulating layer 122 wraps around the annular body 121. The projection plane of the insulating layer 122 coincides with the projection of the battery cell assembly 11, with the plane perpendicular to the arrangement direction Y of the battery module 1 as the projection plane.
[0117] For example, the insulating cladding 122 may contact the battery cell assembly 11.
[0118] In this embodiment, the insulating sheath 122 wraps around the annular body 121. The insulating sheath 122 may wrap around a part or all of the structure of the annular body 121. The insulating sheath 122 is non-conductive. With the plane perpendicular to the arrangement direction Y of the battery module 1 as the projection plane, the projection of the insulating sheath 122 coincides with the projection of the battery cell assembly 11. The insulating sheath 122 can insulate and isolate the annular body 121 and the battery cell 111.
[0119] The annular body 121 can be made of a metal material with good structural strength and ductility, such as steel or copper.
[0120] In some embodiments, the melting temperature of the insulating sheath 122 can exceed 400°C. In the event of thermal runaway of the battery cell 111, the insulating sheath 122 does not essentially melt and can still maintain its shape, thus improving protection reliability.
[0121] In some embodiments, the insulating cladding 122 adopts a mica paper structure or a ceramic structure. That is, the insulating cladding 122 is made of mica paper material or ceramic material. Mica paper structure and ceramic structure have good insulation and heat resistance properties, and the use of mica paper structure or ceramic structure for the insulating cladding can meet both insulation and heat resistance requirements.
[0122] The insulating layer 122 can also be made of other insulating materials. Preferably, the insulating layer 122 can be made of a material with good insulation and heat insulation properties.
[0123] In some embodiments, please refer to Figures 4 to 7 The strap 12 includes a heat-resistant layer 123, which is disposed between the annular body 121 and the insulating layer 122. The melting temperature of the heat-resistant layer 123 is higher than the melting temperature of the insulating layer 122.
[0124] In this embodiment, the melting temperature of the heat-resistant layer 123 is higher than that of the insulating sheath 122. If the battery cell 111 experiences thermal runaway, and the insulating sheath 122 melts under high temperature, the melting temperature of the heat-resistant layer 123 is higher than that of the insulating sheath 122. The heat-resistant layer 123 can still maintain its shape under high temperature conditions and can still effectively isolate the battery cell 111 from the annular body 121, thereby preventing the battery cell 111 from short-circuiting and sparking with the annular body 121, and preventing further deterioration of thermal runaway.
[0125] For example, the melting temperature of the heat-resistant layer 123 can be higher than 400°C. Preferably, the melting temperature of the heat-resistant layer 123 can be higher than 950°C. If the battery cell 111 experiences thermal runaway, the melting temperature of the heat-resistant layer 123 can be higher than the temperature at which the battery cell 111 experiences thermal runaway. The melting temperature of the heat-resistant layer 123 is higher than the melting temperature of the insulating sheath 122. If the insulating sheath 122 melts, the heat-resistant layer 123 can still maintain its shape under high temperature conditions and can still effectively isolate the battery cell 111 from the annular body 121, preventing the battery cell 111 from contacting and short-circuiting with the annular body 121, thereby preventing fire and explosion.
[0126] In some embodiments, the heat-resistant layer 123 comprises a ceramicized silicone rubber structure or a metal oxide structure. That is, the heat-resistant layer 123 is prepared using ceramicized silicone rubber or a metal oxide. Both ceramicized silicone rubber and metal oxide structures have good insulation properties, and their melting temperatures are relatively high. Using a ceramicized silicone rubber or metal oxide structure for the heat-resistant layer 123 can meet the requirement that the heat-resistant layer 123 does not melt at thermal runaway temperatures.
[0127] In some embodiments, please refer to Figures 1 to 7 The battery module 1 includes two end plates 13, which are disposed at both ends of the battery cell assembly 11 along the stacking direction X. The annular body 121 includes two first segments 1211 and two second segments 1212. The two second segments 1212 are respectively connected to the two first segments 1211 to form the annular body 121. The two first segments 1211 are located at the locations of the two end plates 13, and the two second segments 1212 are located at the locations of the battery cell assembly 11. The insulating layer 122 covers at least two second segments 1212.
[0128] The battery cell assembly 11 is sandwiched between two end plates 13. A ring structure formed by straps 12 surrounds the battery cell assembly 11 and the two end plates 13, and the straps 12 tighten the battery cell assembly 11 and the two end plates 13. During the use of the battery cell 111, if the battery cell 111 expands, the end plates 13 can withstand the expansion force transmitted by the large surface of the battery cell 111.
[0129] The insulating sheath 122 covers at least two second segments 1212. The insulating sheath 122 may cover only the entire structure of the two second segments 1212, or the insulating sheath 122 may cover at least a portion of the first segment 1211 and the entire structure of the two second segments 1212.
[0130] In some embodiments, the end plate 13 is an insulating structure, that is, the end plate 13 is made of insulating material, for example, the end plate 13 can be made of plastic.
[0131] In this embodiment, two end plates 13 respectively abut against two battery cells 111 at both ends of the battery cell assembly 11 along the stacking direction X. Two first segments 1211 are located at the two end plates 13. The end plates 13 are usually insulated structures. The first segments 1211 can contact the end plates 13. The first segments 1211 may not be wrapped with the insulating layer 122. Two second segments 1212 are located at the battery cell assembly 11. The insulating layer 122 wraps at least two second segments 1212. The insulating layer 122 contacts the battery cell assembly 11 and provides insulation protection.
[0132] In some embodiments, the end plate 13 can be a metal structure, that is, the end plate 13 is made of a metal material, for example, the end plate 13 can be made of stainless steel. The end plate 13 can be a metal structure, which has good structural strength.
[0133] In some embodiments, please refer to Figures 1 to 3 The battery assembly 100 includes an insulating shield 3 that covers at least the top wall 102 of all battery modules 1.
[0134] The insulating shield 3 is non-conductive and provides insulation.
[0135] In this embodiment, the insulating shield 3 covers at least the top wall 102 of all battery modules 1, and the insulating shield 3 can achieve common protection for all battery modules 1.
[0136] For example, the insulating shield 3 can be bonded to the top wall 102 of all battery modules 1 by adhesive or double-sided tape.
[0137] In some embodiments, the melting temperature of the insulating shield 3 can be higher than 400°C. In the event of thermal runaway of the battery cell 111, the melting temperature of the insulating shield 3 can be higher than the temperature at which the battery cell 111 experiences thermal runaway. In this way, the insulating shield 3 does not essentially melt at the thermal runaway temperature and can still maintain its shape, thus improving the reliability of protection.
[0138] The insulating shielding component 3 can be made of insulating material. Preferably, the insulating shielding component 3 can be made of material with good insulation and heat insulation properties, such as mica paper or ceramic material.
[0139] In some embodiments, please refer to Figures 1 to 3 The insulating shielding component 3 includes a plate 31 and two folded edges 32. The plate 31 covers the top wall 102 of all battery modules 1. The two folded edges 32 are disposed at both ends of the plate 31 along the arrangement direction Y of the battery modules 1, and the folded edges 32 extend from the plate 31 toward the bottom side.
[0140] In this embodiment, the plate 31 can provide insulation for the top wall 102 of all battery modules 1, and the two folded edges 32 can provide protection for the battery modules 1 at both ends of the arrangement direction Y.
[0141] In some embodiments, please refer to Figure 1 The insulating shielding element 3 has a single-layer structure. That is to say, the insulating shielding element 3 is a single layer of material rather than a multi-layer structure.
[0142] In this embodiment, during the assembly of the insulating shielding component 3 to the battery module 1, taking the bonding of the insulating shielding component 3 to the top wall 102 of the battery module 1 as an example, the assembly of the insulating shielding component 3 and all battery modules 1 can be completed in one bonding process, without the need to bond multiple layers of insulating shielding components 3, thus improving assembly efficiency. Moreover, a single layer of insulating shielding component 3 can save materials, reduce costs, and avoid resource waste caused by excessive protection.
[0143] The following describes the battery device 100 provided in this application embodiment further with a specific example. Please refer to [link to specific example]. Figures 1 to 7 The battery device 100 includes an insulating separator 2, an insulating shield 3, and at least two battery modules 1. Each battery module 1 includes two straps 12 and a battery cell assembly 11. Each battery cell assembly 11 includes at least two stacked battery cells 111. The straps 12 surround the outer periphery of the battery cell assembly 11 to secure it. The at least two battery modules 1 are arranged side-by-side in sequence. An insulating separator 2 is provided on one of the two opposite sidewalls 101 of two adjacent battery modules 1. The insulating separator 2 is spaced apart from the straps 12. The two straps 12 are spaced apart along the top-bottom direction Z, and the insulating separator 2 is located between the two straps 12. The distance L between the straps 12 and the insulating separator 2 can be 2 mm.
[0144] The insulating spacer 2 protrudes from both ends of the battery cell assembly 11 along the stacking direction X. The insulating spacer 2 has a single-layer structure and is bonded to the side wall 101 of the battery module 1.
[0145] The strap 12 includes an annular body 121, an insulating layer 122, and a heat-resistant layer 123. The insulating layer 122 at least covers the portion of the annular body 121 located at the battery cell assembly 11. The heat-resistant layer 123 is disposed between the annular body 121 and the insulating layer 122, and the melting temperature of the heat-resistant layer 123 is higher than the melting temperature of the insulating layer 122.
[0146] The battery module 1 includes two end plates 13, which are disposed at both ends of the battery cell assembly 11 along the stacking direction X. The annular body 121 includes two first segments 1211 and two second segments 1212. The two second segments 1212 are respectively connected to the two first segments 1211 to form the annular body 121. The two first segments 1211 are located at the two end plates 13, and the two second segments 1212 are located at the battery cell assembly 11. The insulating layer 122 wraps the two second segments 1212.
[0147] The insulating shielding component 3 includes a plate 31 and two folded edges 32. The plate 31 covers the top wall 102 of all battery modules 1. The two folded edges 32 are located at both ends of the plate 31 along the arrangement direction Y of the battery modules 1, and extend from the plate 31 toward the bottom. The insulating shielding component 3 has a single-layer structure.
[0148] In this embodiment, the insulating spacer 2 is used to isolate two adjacent battery modules 1. If a battery cell 111 in one of the battery modules 1 experiences thermal runaway, the insulating spacer 2 can not only prevent heat from spreading between the two adjacent battery modules 1, thus preventing further thermal runaway, but also isolate the battery cells 111 in the adjacent battery modules 1, preventing short circuits between the battery cells 111 in the adjacent battery modules 1, thereby achieving the purpose of thermal runaway protection. The insulating spacer 2 is spaced apart from the strap 12. On the one hand, the size of the insulating spacer 2 can be relatively small, reducing its cost to some extent; on the other hand, the insulating spacer 2 and the strap 12 do not contact each other, preventing the risk of damage or falling off the insulating spacer 2 due to repeated friction between the strap 12 and the insulating spacer 2 in the event of expansion of the battery cell 111 during use. The spacing between the strap 12 and the insulating spacer 2 is moderate, and the size of the insulating spacer 2 is moderate, which can balance the needs of isolating two adjacent battery modules 1 with cost requirements. In the X-direction of the stacking of battery cells 111, the insulating spacer 2 can basically cover all battery cells 111, improving reliability. The single-layer insulating spacer 2 and the single-layer insulating shield 3 can save materials, reduce costs, and avoid resource waste caused by over-protection.
[0149] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit it. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in each embodiment can be combined in any way.
Claims
1. A battery device, characterized in that, include: At least two battery modules, each battery module including a strap and a battery cell assembly, each battery cell assembly including at least two stacked battery cells, the straps surrounding the outer periphery of the battery cell assembly to secure the battery cell assembly, and the at least two battery modules arranged side by side in sequence; An insulating separator is provided on at least one of the two opposite sidewalls of two adjacent battery modules, the insulating separator being spaced apart from the strap.
2. The battery device according to claim 1, characterized in that, Each of the battery modules has two straps, which are spaced apart along the top-bottom direction, and the insulating spacer is located between the two straps.
3. The battery device according to claim 1, characterized in that, The distance between the strap and the insulating insulating element is L, where 0mm < L ≤ 2.5mm.
4. The battery device according to claim 1, characterized in that, The insulating spacer is flush with or protrudes from at least one end of the battery cell assembly along the stacking direction.
5. The battery device according to claim 1, characterized in that, The insulating separator has a single-layer structure; and / or, the insulating separator is bonded to the sidewall of the battery module.
6. The battery device according to claim 1, characterized in that, The strap includes an annular body and an insulating layer. The insulating layer wraps around the annular body, and the projection of the insulating layer coincides with the projection of the battery cell assembly, with the plane perpendicular to the arrangement direction of the battery module as the projection plane.
7. The battery device according to claim 6, characterized in that, The strap includes a heat-resistant layer disposed between the annular body and the insulating layer, and the heat-resistant layer melts at a temperature higher than that of the insulating layer.
8. The battery device according to claim 6, characterized in that, The battery module includes two end plates, which are disposed at both ends of the battery cell assembly along the stacking direction. The annular body includes two first segments and two second segments, which are respectively connected to the two first segments to form the annular body. The two first segments are located at the locations of the two end plates, and the two second segments are located at the locations of the battery cell assembly. The insulating layer covers at least two of the second segments.
9. The battery device according to claim 7, characterized in that, The heat-resistant layer comprises a ceramicized silicone rubber structure or a metal oxide structure; and / or, the insulating cladding comprises a mica paper structure or a ceramic structure.
10. The battery device according to any one of claims 1 to 9, characterized in that, The battery device includes an insulating shield that covers at least the top wall of all the battery modules.
11. The battery device according to claim 10, characterized in that, The insulating shielding component includes a plate and two folded edges. The plate covers the top wall of all the battery modules, and the two folded edges are disposed at both ends of the plate along the arrangement direction of the battery modules, extending from the plate towards the bottom.
12. The battery device according to claim 10, characterized in that, The insulating shielding component has a single-layer structure.
13. The battery device according to any one of claims 1 to 9, characterized in that, The insulating insulating component melts at a temperature higher than 400°C.
14. The battery device according to any one of claims 1 to 9, characterized in that, The insulating insulating component includes a mica paper structure or a ceramic structure.
15. An energy storage device, characterized in that, Includes the battery device according to any one of claims 1 to 14, the battery device being used to store or provide electrical energy.