Battery module, battery pack, and electrical device

Abstract

Provided are a battery module, a battery pack, and an electrical device. The battery module comprises a housing, a battery cell assembly, and a temperature detection piece; the housing has a first space, and the battery cell assembly is arranged in the first space; the battery cell assembly comprises multiple battery cell units; each battery cell unit comprises a battery cell and a support, the battery cell comprises a battery cell housing, the support covers at least part of the battery cell housing, and the temperature detection piece is arranged on the support.

Description

Battery modules, battery packs, and electrical equipment Technical Field

[0001] This application relates to the field of battery technology, and more specifically, to a battery module, a battery pack, and an electrical device. Background Technology

[0002] Battery modules typically generate heat during use. If the heat is excessive, thermal runaway can occur, affecting the normal operation of the battery module.

[0003] Summary of the Invention

[0004] This application provides a battery module, a battery pack, and an electrical device that improves the accuracy of temperature detection in the battery module and reduces the possibility of thermal runaway in the battery module.

[0005] In a first aspect, embodiments of this application provide a battery module, including a housing, a cell assembly, and a temperature detection device. The housing has a first space; the cell assembly is disposed in the first space, and the cell assembly includes multiple cell units. Each cell unit includes a cell and a bracket. The cell includes a cell housing, and the bracket covers at least a portion of the cell housing; the temperature detection device is disposed on the bracket.

[0006] The casing protects and prevents dust from entering the battery cell assembly. The support bracket is subjected to force before the battery cell, thus protecting it. The temperature sensor has good positional stability, reducing the probability of movement relative to the battery cell. This results in more accurate temperature readings, facilitating precise control of the battery cell's charging and discharging based on its temperature, and minimizing the possibility of battery module damage or failure due to thermal runaway.

[0007] In one or more of the above optional embodiments, the battery cell further includes electrode terminals, the battery cell housing includes a main body portion and a first sealing portion, the electrode terminals extend from the first sealing portion out of the battery cell housing; a bracket covers at least a portion of the first sealing portion, and the electrode terminals extend from the bracket.

[0008] When at least part of the first sealing part is subjected to force, the bracket is subjected to force before the first sealing part, thereby protecting the first sealing part. Furthermore, the bracket increases the sealing strength of the first sealing part, making it less likely to break when the battery cell does not experience thermal runaway. This allows the temperature detected by the temperature sensing element to be close to the temperature of the electrode terminals, which helps improve the accuracy of temperature detection of the battery cell and reflects its actual temperature.

[0009] In one or more of the above optional embodiments, the bracket includes a first portion, a first sealing portion includes an end remote from the main body portion, the first portion covers at least a portion of the end portion; a temperature sensing element is disposed on the first portion.

[0010] When at least a portion of the end is subjected to force, the first portion is subjected to force before the end, thereby protecting the end. Furthermore, the first portion increases the sealing strength of the first sealing part, reducing the probability of the end breaking open before thermal runaway occurs in the battery cell. When the battery cell expands, the force exerted by the battery cell on the temperature sensing element is smaller, reducing the probability of damage to both the battery cell and the temperature sensing element. It also facilitates the assembly of the temperature sensing element onto the battery cell unit after multiple individual battery cells are assembled into a battery cell assembly.

[0011] In one or more of the above optional embodiments, the first part includes a body and a protrusion, the protrusion protruding from the body and the body covering the end; the temperature sensing element is disposed on the protrusion.

[0012] The temperature sensing device detects the heat transferred directly from the electrode terminals through the protrusion, resulting in less heat loss and minimal impact on the energy density of the battery module.

[0013] In one or more of the above optional embodiments, the protrusion is provided with a groove, and the temperature sensing element is accommodated in the groove.

[0014] The temperature sensing device detects the heat transferred directly from the electrode terminals through the protrusion, resulting in less heat loss and minimal impact on the energy density of the battery module.

[0015] In one or more of the above optional embodiments, the electrode terminal includes a first segment connected to the protrusion; the first segment includes a first surface and a second surface disposed opposite to each other, the first surface being connected to the protrusion and the second surface being exposed on the protrusion.

[0016] The protrusions provide support for the electrode terminals, reducing the probability of deformation under stress and facilitating electrical connection between other mechanisms and the electrode terminals.

[0017] In one or more of the above alternative embodiments, at least a portion of the first seal is exposed outside the support. This facilitates pressure relief of the battery cell.

[0018] In one or more of the above optional embodiments, the battery module further includes a fixing member, and the temperature detection member and the bracket are fixed by the fixing member.

[0019] This further stabilizes the position of the temperature sensor on the bracket, reduces the probability of the temperature sensor moving relative to the battery cell, and thus improves the accuracy of the temperature value of the battery cell detected by the temperature sensor.

[0020] In one or more of the above optional embodiments, the fastener is a thermally conductive adhesive with a thermal conductivity of 0.8 to 3.0 W / (m·K).

[0021] The thermally conductive adhesive can transfer the heat received from the electrode terminals to the temperature sensing element through the bracket, thus reducing the heat loss from the electrode terminals to the temperature sensing element. This allows the temperature detected by the temperature sensing element to be closer to the actual temperature of the electrode terminals, which is beneficial to further improving the accuracy of the cell temperature detection.

[0022] In one or more of the above optional embodiments, the temperature sensing element and the bracket are interference-fitted.

[0023] This makes the temperature sensor more stable on the bracket, reduces the probability of the temperature sensor moving relative to the battery cell, and thus makes the temperature value of the battery cell detected by the temperature sensor more accurate.

[0024] In one or more of the above optional embodiments, the temperature sensing element includes a temperature detector and a wire, the temperature detector is connected to the wire, the temperature detector and the wire are respectively fixed to the bracket, and the wire is in a stretchable state.

[0025] When the battery cell expands and moves, the conductor can move with the battery cell, which reduces the probability of damage caused by movement and provides greater flexibility.

[0026] In one or more of the above optional embodiments, the battery module further includes an elastic element located at at least one end of the cell assembly along a first direction; the wire is fixed to the elastic element.

[0027] The cell assembly abuts against the elastic element and the housing, making its position within the housing more stable and reducing the probability of wobbling. This improves the stability of the electrical connection between multiple cell units and reduces the possibility of damage from collisions between the cell units and the housing. When the cell unit expands, the wires can move with the elastic element, further stabilizing their position.

[0028] In one or more of the above optional embodiments, the elastic element includes a base, a buffer portion, and a connecting portion. The base is connected to the cell assembly, the buffer portion is connected to the connecting portion and the base, the buffer portion is configured to provide expansion space for the cell assembly, the connecting portion is fixed to the housing, and the wire is fixed to the connecting portion.

[0029] When the battery cell assembly expands and moves, a buffer is configured to provide expansion space, making the movement of the battery cell assembly more stable and reducing the possibility of damage from collisions between the battery cell assembly and the housing. The position of the conductors is more stable, and the electrical connection with other mechanisms is also more stable.

[0030] In one or more of the above optional embodiments, the bracket includes a second part, the main body includes a first wall connected to the first sealing part, the second part covers at least a portion of the first wall; a temperature sensing element is disposed on the second part.

[0031] When the cell unit is subjected to force, the second part is subjected to force before at least part of the first wall, thereby enabling the second part to protect the first wall. Furthermore, the second part increases the sealing strength of the first sealing part, making it less likely that the portion of the first sealing part covered by the second part will break open before the cell experiences thermal runaway.

[0032] In one or more of the above optional embodiments, the battery cell is a pouch cell.

[0033] In one or more of the above optional embodiments, the bracket is integrally formed into the battery cell. This improves the connection strength between the bracket and the battery cell.

[0034] In one or more of the above optional embodiments, the housing includes a top wall and a bottom wall disposed opposite each other along a third direction;

[0035] Along the second direction, the support is configured to be movable relative to the bottom wall; wherein the second direction is perpendicular to the third direction.

[0036] When the battery cell expands, it can move within the casing, reducing the problem of excessive internal pressure caused by the cell being unable to move and thus restricting its expansion.

[0037] In one or more of the above optional embodiments, the battery module includes a structural member disposed between the bottom wall and the cell assembly and in contact with the cell assembly; wherein the coefficient of friction between the bracket and the structural member is less than the coefficient of friction between the cell unit and the bottom wall, and the cell unit is configured to move on the structural member along a second direction.

[0038] Compared to battery modules where the cell assembly is in direct contact with the casing (where the cell unit directly rubs against the bottom wall), the battery module of this application reduces the friction between the cell unit and the structural components when the cell unit expands and moves on the structural components. This results in less wear on the cell unit, a lower probability of cell unit breakage, and a reduced likelihood of leakage or short circuits, thereby extending the lifespan of the battery module.

[0039] Secondly, embodiments of this application provide a battery pack, including a front cover and a battery module as described above, wherein the front cover is connected to the housing.

[0040] In one or more of the above optional embodiments, the battery pack includes a circuit board, and the front cover has a second space; the circuit board is disposed in the second space, and the circuit board is connected to the cell assembly.

[0041] The front cover protects and prevents dust from entering the battery cell assembly and circuit board. The circuit board controls the charging and discharging of the battery cell assembly.

[0042] Thirdly, embodiments of this application provide an electrical device including a load and at least one battery pack as described above, wherein the battery pack supplies power to the load. Attached Figure Description

[0043] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings.

[0044] Figure 1 is a three-dimensional structural diagram of a battery pack provided in some embodiments of this application;

[0045] Figure 2 is a schematic diagram of the exploded structure of a battery pack provided in some embodiments of this application;

[0046] Figure 3 is a perspective view of the battery module structure provided in some embodiments of this application;

[0047] Figure 4 is a perspective view of a portion of the structure of a battery pack provided in some embodiments of this application;

[0048] Figure 5 is a partial enlarged structural diagram of point A in the battery pack in Figure 4;

[0049] Figure 6 is a three-dimensional structural diagram of the battery pack cell unit and temperature detection device provided in some embodiments of this application;

[0050] Figure 7 is a partial enlarged structural diagram of the battery pack in Figure 6;

[0051] Figure 8 is a three-dimensional structural schematic diagram of a battery cell unit provided in some embodiments of this application;

[0052] Figure 9 is a partially enlarged structural schematic diagram of some other embodiments of this application;

[0053] Figure 10 is a three-dimensional structural diagram of the battery cell of a battery pack provided in some embodiments of this application;

[0054] Figure 11 is a three-dimensional structural diagram of a portion of the battery pack provided in some embodiments of this application;

[0055] Figure 12 is a partially enlarged structural diagram of point C in the battery pack in Figure 11;

[0056] Figure 13 is a three-dimensional structural schematic diagram of the cell unit of the battery pack provided in some embodiments of this application from another perspective;

[0057] Figure 14 is a three-dimensional structural schematic diagram of the elastic element of the battery pack provided in some embodiments of this application;

[0058] Figure 15 is a partially enlarged structural diagram of point D in the battery pack in Figure 8.

[0059] Icons: 10-Battery module; 11-Housing; 1100-First space; 110-Top wall; 120-Bottom wall; 130-Side wall; 12-Cell assembly; 200-Cell unit; 210-Cell; 211-Cell housing; 2111-Main body; 2112-First sealing part; 2113-First wall; 2114-Second sealing part; 212-Electrode terminal; First section-2120; First surface-2120a; Second surface-2120b; 213-Second electrode terminal; 220-Bracket; 221-First part; 2211-Main body; 21120-End; 2212-Protrusion; 2213-Groove; 222-Second part; 223-First connecting part; 224-Second connecting part; 231-Third support part; 232-Fourth support part; 2321-Notch; 233-Third connecting part; 234-Fourth connecting part; 230-Second bracket; 13-Temperature detection element; 13a-Temperature detector; 13b-Wire; 14-Elastic element; 410-Base; 420-Buffer part; 430-Connecting part; 15-Structural element; 20-Front cover; 201-Connector; 30-Circuit board; X-First direction; Y-Second direction; Z-Third direction.

[0060] Specific implementation methods

[0061] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0062] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the specification of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having" and any variations thereof in the specification, claims and foregoing description of the drawings are intended to encompass non-exclusive inclusion.

[0063] The terms "first," "second," etc., in the specification, claims, or the accompanying drawings of this application are used to distinguish different objects, rather than to describe a specific order or primary / secondary relationship.

[0064] In this application, the reference to "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 in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0065] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0066] A battery cell consists of electrode assemblies and an electrolyte. The electrode assemblies are composed of a positive electrode, a negative electrode, and a separator. The battery cell primarily functions by the movement of metal ions between the positive and negative electrode assemblies. The positive electrode includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector, and the current collector without the coating serves as the positive terminal. Taking a lithium-ion battery as an example, the material of the positive current collector can be aluminum, and the positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The negative electrode includes a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative current collector, and the current collector without the coating serves as the negative terminal. The material of the negative current collector can be copper, and the negative active material can be carbon or silicon, etc. To ensure that large currents can be passed without melting, multiple positive electrode tabs and multiple negative electrode tabs are stacked together. The material of the separator can be PP (polypropylene) or PE (polyethylene), etc.

[0067] The structure and materials of the battery cells dictate that they generate heat during charging and discharging, causing their temperature to rise. Excessive heat generation can damage or cause the cell itself to fail, potentially leading to short circuits, damage, or failure in other cells or components (such as circuit boards or wires), and even serious safety issues like smoke, fire, or explosion. To reduce the possibility of thermal runaway in battery modules, temperature sensors are currently installed on the cells to monitor their temperature. However, directly placing these sensors on the cells results in poor positional stability; they are prone to shifting or even detaching from the cells, leading to inaccurate temperature readings and a still relatively high risk of thermal runaway in the battery module.

[0068] To improve the accuracy of temperature detection in battery modules, this application provides a battery module including a housing, a cell assembly, and a temperature detection device. The housing has a first space, the cell assembly is disposed in the first space, the cell assembly includes multiple cell units, each cell unit includes a cell and a bracket, the cell includes a cell housing, the bracket covers at least a portion of the cell housing, and the temperature detection device is disposed on the bracket.

[0069] In this battery module structure, the casing protects and prevents dust from entering the cell assembly. The cell assembly comprises multiple cell units, resulting in a higher energy density for the battery module. The support covers at least a portion of the cell casing, ensuring that when at least a portion of the cell is subjected to force, the support is affected before the cell, thus protecting the cell. The temperature sensor is mounted on the support, ensuring good positional stability and reducing the probability of movement of the temperature sensor relative to the cell. This leads to better accuracy in detecting the cell temperature, facilitating precise control of cell charging and discharging based on the cell temperature and reducing the possibility of battery module damage or failure due to cell thermal runaway.

[0070] This application provides a battery pack including a battery module. The battery pack can be a secondary battery or a primary battery, such as a lithium-ion battery, a sodium-ion battery, or a magnesium-ion battery, etc., and this application is not limited in this respect. The battery pack can be cylindrical, flat, cuboid, or other shapes, and this application is not limited in this respect either.

[0071] This application provides an electrical device that uses at least one battery pack as a power source. The electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc.

[0072] Referring to Figures 1 to 6, Figure 1 is a three-dimensional structural diagram of a battery pack provided in some embodiments of this application; Figure 2 is an exploded structural diagram of a battery pack provided in some embodiments of this application; Figure 3 is a three-dimensional structural diagram of a battery module provided in some embodiments of this application; Figure 4 is a three-dimensional structural diagram of a portion of a battery pack provided in some embodiments of this application; Figure 5 is a partially enlarged structural diagram of point A in the battery pack in Figure 4; and Figure 6 is a three-dimensional structural diagram of the cell unit and temperature detection device of the battery pack provided in some embodiments of this application.

[0073] For ease of description, some electrode terminals are not shown as bent in the attached diagram.

[0074] This application provides a battery module 10, which includes a housing 11 and a cell assembly 12. The housing 11 is provided with a first space 1100, and the cell assembly 12 is disposed in the first space 1100, so that the housing 11 plays a role in protecting and dustproofing the cell assembly 12.

[0075] In some embodiments, the housing 11 can be made of a high-strength material, such as steel, aluminum alloy or other metal materials, so that the housing 11 has high stress performance, thereby reducing the possibility of deformation or damage to the housing 11 due to stress or environmental changes, and thus making the battery module 10 more reliable.

[0076] In other embodiments, the housing 11 may also be made of high-strength non-metallic materials such as carbon fiber or rigid plastic.

[0077] In some embodiments, the housing 11 may include a top wall 110, a bottom wall 120, and a plurality of side walls 130, which may be fixedly connected by connectors (e.g., screws).

[0078] In other embodiments, the top wall 110, the bottom wall 120, and the plurality of side walls 130 may also be fixedly connected by means of welding, bonding, protrusion and groove limiting cooperation, etc.

[0079] In other embodiments, the top wall 110, the bottom wall 120, and the plurality of side walls 130 may also be integrally formed.

[0080] In some embodiments, the cell assembly 12 includes a plurality of cell units 200, which results in a higher energy density for the battery module 10.

[0081] In some embodiments, a plurality of battery cell units 200 may be arranged along a second direction Y, such that when the battery cell 210 expands, the battery cell unit 200 moves relative to the housing 11 along the second direction Y.

[0082] In some embodiments, the first direction X, the second direction Y, and the third direction Z are perpendicular to each other. In other embodiments, the first direction X, the second direction Y, and the third direction Z may also intersect each other.

[0083] In some embodiments, the battery cell unit 200 includes a battery cell 210 and a support 220. The battery cell 210 includes a battery cell housing 211, and the support 220 covers at least a portion of the battery cell housing 211, such that when at least a portion of the battery cell 210 is subjected to force, the support 220 is subjected to force before the battery cell 210, thereby protecting the battery cell 210.

[0084] In some embodiments, the bracket 220 covers the cell housing 211 by means including but not limited to assembly, integral molding, spraying, etc.

[0085] In some embodiments, the battery cell 210 may be in the form of a cuboid, a flat body, a cylinder, or other shapes, and the embodiments of this application are not limited in this respect.

[0086] In some embodiments, cell 210 may be a pouch cell.

[0087] In other embodiments, cell 210 may also be a hard-shell cell.

[0088] In some embodiments, the bracket 220 can be integrally formed with the battery cell 210, thereby improving the connection strength between the bracket 220 and the battery cell 210. Integral forming means that the bracket 220 and the battery cell 210 are directly fixed together. Integral forming methods include, but are not limited to, potting processes and injection molding processes.

[0089] In some embodiments, after the insulating material is placed around the battery cell 210 by a potting process, the insulating material is cured to form a support 220. The support 220 and the battery cell 210 are bonded and fixed together. For example, the battery cell 210 is placed in a mold, the insulating material is poured into the mold, and after the insulating material is cured to form the support 220 and bonded and fixed together with the battery cell 210, the support 220 and the battery cell 210 are removed from the mold.

[0090] In some embodiments, the insulating material includes, but is not limited to, potting compound and foam.

[0091] In some embodiments, the injection molding process includes placing the battery cell 210 into a mold, heating and melting an insulating material using injection molding equipment, allowing the molten insulating material to flow into the mold, and after the insulating material solidifies to form a support 220 and bond it to the battery cell 210, removing the support 220 and the battery cell 210 from the mold. Optionally, the insulating material may include polyamide.

[0092] In some embodiments, the bracket 220 is an insulating bracket, which can reduce the risk of short circuit between the bracket 220 and the battery cell 210.

[0093] In other embodiments, the bracket 220 may also be fixed to the cell 210 by means of fasteners or clips.

[0094] In some embodiments, the battery module 10 includes a temperature detection element 13, which is disposed on the bracket 220. This improves the positional stability of the temperature detection element 13, reduces the probability of the temperature detection element 13 moving relative to the battery cell 210, and thus improves the accuracy of the temperature value of the battery cell 210 detected by the temperature detection element 13. This facilitates accurate control of the charging and discharging of the battery cell 210 based on its temperature value, and reduces the possibility of damage or failure of the battery module 10 due to thermal runaway of the battery cell 210.

[0095] Referring to Figures 6 to 9, Figure 7 is a partially enlarged structural schematic diagram of point B of the battery pack in Figure 6; Figure 8 is a three-dimensional structural schematic diagram of the cell unit of the battery pack provided in some embodiments of this application; Figure 9 is a partially enlarged structural schematic diagram of some other embodiments of this application, wherein the temperature detector 13a is disposed in the second part 222.

[0096] In some embodiments, the battery cell 210 includes an electrode terminal 212, and the battery cell housing 211 includes a main body portion 2111 and a first sealing portion 2112. The electrode terminal 212 extends from the first sealing portion 2112 out of the battery cell housing 211, so that an external mechanism is electrically connected to the battery cell 210 through the electrode terminal 212.

[0097] In some embodiments, an electrode assembly (not shown) is disposed on the main body portion 2111.

[0098] In some embodiments, the bracket 220 covers at least a portion of the first sealing portion 2112, and the electrode terminal 212 extends from the bracket 220. This ensures that when at least a portion of the first sealing portion 2112 is subjected to force, the bracket 220 is subjected to force before the first sealing portion 2112, thereby protecting the first sealing portion 2112. Furthermore, the bracket 220 increases the sealing strength of the first sealing portion 2112, reducing the probability of the first sealing portion 2112 breaking open before thermal runaway occurs in the battery cell 210. This also allows the temperature detected by the temperature sensing element 13 to be close to the temperature of the electrode terminal 212, improving the accuracy of temperature detection in the battery cell 210 and reflecting the actual temperature of the battery cell 210.

[0099] Please also refer to Figure 10, which is a three-dimensional structural diagram of the battery cell of a battery pack provided in some embodiments of this application.

[0100] In some embodiments, the bracket 220 includes a first portion 221, and the first sealing portion 2112 includes an end portion 21120 remote from the main body portion 2111. The first portion 221 covers at least a portion of the end portion 21120. This ensures that when at least a portion of the end portion 21120 is subjected to force, the first portion 221 is subjected to force before the end portion 21120, thereby enabling the first portion 221 to protect the end portion 21120. Furthermore, the first portion 221 increases the sealing strength of the first sealing portion 2112, making the probability of the end portion 21120 breaking open when the cell 210 does not experience thermal runaway relatively low.

[0101] In some embodiments, the temperature sensing element 13 is disposed on the first portion 221. When the battery cell 210 expands, the force exerted by the battery cell 210 on the temperature sensing element 13 is smaller, and the probability of damage to the battery cell 210 and the temperature sensing element 13 is lower. Furthermore, it facilitates the assembly of the temperature sensing element 13 onto the battery cell unit 200 after multiple battery cell units 200 are assembled into a battery cell assembly 12.

[0102] In some embodiments, the first portion 221 includes a body 2211 and a protrusion 2212, the protrusion 2212 protruding from the body 2211, and the body 2211 covering the end portion 21120. The temperature sensing element 13 is disposed on the protrusion 2212.

[0103] In some embodiments, the body 2211 and the protrusion 2212 may be integrally formed.

[0104] In other embodiments, the main body 2211 and the protrusion 2212 can also be fixedly connected by means of adhesive, snap-fit, etc.

[0105] When monitoring and adjusting the temperature of the battery cell 210, detecting the higher-temperature portions of the cell 210 and adjusting its charging and discharging processes accordingly is a better monitoring method. During the charging and discharging process, the protrusion 2212 contacts the electrode terminal 212. The temperature detection element 13 is positioned on the protrusion 2212, allowing it to detect the heat transferred directly from the electrode terminal 212 through the protrusion 2212. This results in minimal heat loss and a smaller impact on the energy density of the battery module 10.

[0106] Referring also to Figures 11 and 12, Figure 11 is a three-dimensional structural diagram of a portion of the battery pack provided in some embodiments of this application; Figure 12 is a partially enlarged structural diagram of the battery pack at point C in Figure 11.

[0107] In some embodiments, the protrusion 2212 is provided with a groove 2213, and the temperature sensing element 13 is accommodated within the groove 2213. This makes the position of the temperature sensing element 13 on the bracket 220 more stable, and the probability of the temperature sensing element 13 moving relative to the battery cell 210 is lower, thereby making the temperature value of the battery cell 210 detected by the temperature sensing element 13 more accurate. Furthermore, the probability of the temperature sensing element 13 interfering with other mechanisms is also lower.

[0108] In some embodiments, the opening direction of the groove 2213 is parallel to the second direction Y and faces away from the electrode terminal 212, such that when the detection detector 13 is housed in the groove 2213, the detection detector 13 is located on the side of the protrusion 2212 facing away from the electrode terminal 212.

[0109] In other embodiments, the opening direction of the groove 2213 may also be parallel to the first direction X and away from the cell 210, or the opening direction of the groove 2213 may also be parallel to the third direction Z.

[0110] In some other embodiments, the protrusion 2212 may not be provided, and a groove 2213 may be provided on the main body 2211, so that the temperature sensing element 13 is accommodated in the groove 2213.

[0111] Referring to Figures 8, 12 and 13, Figure 13 is a three-dimensional structural schematic diagram of the cell unit of the battery pack provided in some embodiments of this application from another perspective.

[0112] In some embodiments, the electrode terminal 212 includes a first segment 2120 connected to the protrusion 2212. The first segment 2120 includes a first surface 2120a and a second surface 2120b disposed opposite to each other. The first surface 2120a is connected to the protrusion 2212, and the second surface 2120b is exposed on the protrusion 2212. This allows the protrusion 2212 to support the electrode terminal 212, reducing the probability of deformation of the electrode terminal 212 under stress and facilitating electrical connection between other mechanisms and the electrode terminal 212.

[0113] In some embodiments, along the second direction Y, the electrode terminal 212 is connected to one side of the protrusion 2212, and the temperature sensing element 13 is disposed on the other side of the protrusion 2212. This results in a shorter transmission distance and less heat loss when heat from the electrode terminal 212 is transferred to the temperature sensing element 13 through the protrusion 2212. Consequently, the temperature detected by the temperature sensing element 13 is closer to the temperature of the electrode terminal 212, which is beneficial for further improving the accuracy of temperature detection of the battery cell 210.

[0114] In other embodiments, the temperature sensing element 13 may also be disposed on one side of the protrusion 2212 along the first direction X, or on one side of the protrusion 2212 along the third direction Z.

[0115] In some embodiments, at least a portion of the first sealing portion 2112 is exposed outside the bracket 220. This facilitates pressure relief of the battery cell 210.

[0116] In some embodiments, the battery module 10 includes a fixing member (not shown), and the temperature detection element 13 and the bracket 220 are fixed by the fixing member. This further makes the position of the temperature detection element 13 on the bracket 220 more stable, and the probability of the temperature detection element 13 moving relative to the battery cell 210 is lower, thereby making the temperature value of the battery cell 210 detected by the temperature detection element 13 more accurate.

[0117] In some embodiments, the fixing element can be a thermally conductive adhesive with a thermal conductivity of 0.8–3.0 W / (m·K), such as 0.8 W / (m·K), 1.4 W / (m·K), or 3.0 W / (m·K). The thermally conductive adhesive can transfer the heat received from the electrode terminal 212 to the temperature sensing element 13 through the bracket 220, resulting in less heat loss from the electrode terminal 212 to the temperature sensing element 13. This allows the temperature detected by the temperature sensing element 13 to be closer to the actual temperature of the electrode terminal 212, which is beneficial for further improving the accuracy of temperature detection of the battery cell 210.

[0118] In other embodiments, the fastener may also be other adhesives, which are attached to the portion of the temperature sensing element 13 facing the bracket 220 to reduce heat loss caused by the adhesive and improve the accuracy of temperature detection of the cell 210.

[0119] In other embodiments, the fastener may also be a flexible snap fastener, a slot, or other fastening structure.

[0120] In other embodiments, the temperature sensing element 13 and the bracket 220 can be an interference fit. This makes the position of the temperature sensing element 13 on the bracket 220 more stable, reduces the probability of the temperature sensing element 13 moving relative to the cell 210, and thus improves the accuracy of the temperature value of the cell 210 detected by the temperature sensing element 13.

[0121] In some embodiments, the temperature detection element 13 includes a temperature detector 13a and a wire 13b, the temperature detector 13a is connected to the wire 13b, the temperature detector 13a is fixed to the bracket 220, and the wire 13b is fixed to the bracket 220.

[0122] In some embodiments, the temperature detector 13a and the wire 13b are fixed to the same bracket 220.

[0123] In some embodiments, the temperature detector 13a and the wire 13b may be fixed to different brackets 220.

[0124] In some embodiments, a portion of the wire 13b and the temperature detector 13a are fixed to the same bracket 220, and a portion of the wire 13b is also fixed to other brackets 220.

[0125] In some embodiments, referring to FIG5, the temperature detector 13a is fixed to the first portion 221, and the wire 13b is fixed to the first portion 221, which helps to reduce the stress on the temperature detector 13a. Optionally, the temperature detector 13a and the wire 13b are fixed to the first portion 221 of the same bracket 220.

[0126] In some embodiments, the temperature detector 13a can be an NTC (Negative Temperature Coefficient) sensor. This makes the temperature detector 13a smaller in size and occupies less space, reducing its impact on the energy density of the battery module 10. Furthermore, the NTC temperature sensor has high detection accuracy, which facilitates timely adjustments based on the detected temperature value, reducing the possibility of thermal runaway in the battery module 10. In some embodiments, the temperature detector 13a is cylindrical.

[0127] In other embodiments, the temperature sensing element 13 may also be arranged in a square, spherical or other shapes.

[0128] In other embodiments, the temperature detector 13a may also be a PTC (Positive Temperature Coefficient) sensor, etc.

[0129] In some embodiments, the conductor 13b is in a stretchable state. When the battery cell 210 expands and moves, the conductor 13b can move with the battery cell 210, which reduces the probability of damage caused by movement and provides greater flexibility.

[0130] Referring to Figures 2 and 3, in some embodiments, the battery module 10 may include an elastic member 14 located at at least one end of the cell assembly 12 along the second direction Y. This allows the cell assembly 12 to abut against the elastic member 14 and the housing 11, making the position of the cell assembly 12 within the housing 11 more stable and reducing the probability of wobbling. This improves the stability of the electrical connection of the multiple cell units 200 and reduces the possibility of damage to the cell units 200 due to collision with the housing 11.

[0131] In some embodiments, the elastic element 14 is configured to provide expansion space for the cell assembly 12.

[0132] In some embodiments, the number of elastic members 14 is one, so that the cell assembly 12 remains in contact with the elastic member 14 and the housing 11 before and after expansion, and the space occupied by the elastic member 14 is small, which is beneficial to improving the energy density of the battery module 10.

[0133] In other embodiments, there may be two elastic elements 14, with each elastic element 14 located at one end of the cell assembly 12 along the second direction Y. When multiple cell units 200 expand, the cell units 200 can move towards the two ends of the cell assembly 12 along the second direction Y, resulting in a shorter movement distance for the cell units 200 closer to the two ends of the cell assembly 12 along the second direction Y. This reduces wear on the cell units 200 closer to the two ends of the cell assembly 12 along the second direction Y and improves the service life of the battery module 10.

[0134] In some embodiments, the wire 13b is fixed to the elastic member 14. When the battery cell 200 expands, the wire 13b can move with the elastic member 14, making the position of the wire 13b more stable.

[0135] Referring to Figure 14, Figure 14 is a three-dimensional structural schematic diagram of the elastic element of the battery pack provided in some embodiments of this application.

[0136] In some embodiments, the elastic member 14 includes a base 410, a buffer portion 420, and a connecting portion 430. The base 410 is connected to the cell assembly 12, the buffer portion 420 connects the connecting portion 430 and the base 410, and the connecting portion 430 is fixed to the housing 11. When the cell assembly 12 expands and moves, the buffer portion 420 is configured to provide expansion space for the cell assembly 12, making the movement of the cell assembly 12 more stable and reducing the possibility of the cell assembly 12 being damaged by collision with the housing 11.

[0137] In some embodiments, the wire 13b is fixed to the connector 430. This makes the position of the wire 13b more stable and the electrical connection with other mechanisms more stable.

[0138] In some embodiments, the base 410 contacts the battery cell assembly 12.

[0139] In some embodiments, other components are disposed between the base 410 and the cell assembly 12, and the base 410 and the cell assembly 12 are connected by other components. For example, the base 410 and the cell assembly 12 are connected by a buffer, which may optionally include foam.

[0140] In some embodiments, the elastic element 14 is disposed within the housing 11 to facilitate the disassembly and maintenance of the battery module 10.

[0141] In some embodiments, the connecting portion 430 is fixed to the housing 11.

[0142] In some embodiments, fixing includes, but is not limited to, abutment, bonding, welding, fastener locking, snap-fit ​​connection, etc.

[0143] In some embodiments, the housing 11 is provided with a plurality of fixing portions 11a, and the connecting portion 430 is fixed to the fixing portions 11a. Optionally, the connecting portion 430 abuts against the fixing portion 11a.

[0144] In some embodiments, a plurality of fixing portions 11a are respectively disposed on the top wall 110, the bottom wall 120 and the side wall 130 disposed opposite to each other along the first direction X at one end along the second direction Y. The end of the battery cell assembly 12 facing away from the elastic member 14 along the second direction Y abuts against the other side wall 130. The connecting portion 430 abuts against the fixing portion 11a to fix the battery cell assembly 12 and the elastic member 14 between the fixing portion 11a and the other side wall 130.

[0145] Referring to Figures 8 and 10, in some embodiments, the support 220 includes a second portion 222, and the main body 2111 includes a first wall 2113 connecting the first sealing portion 2112. The second portion 222 covers at least a portion of the first wall 2113. This ensures that when the battery cell 200 is subjected to force, the second portion 222 is subjected to force before at least a portion of the first wall 2113, thereby enabling the second portion 222 to protect the first wall 2113. Furthermore, the second portion 222 increases the sealing strength of the first sealing portion 2112, making it less likely that the portion of the first sealing portion 2112 covered by the second portion 222 will break open when the battery cell 210 does not experience thermal runaway.

[0146] In some other embodiments, the temperature sensing element 13 may also be disposed on the second part 222.

[0147] In some embodiments, the first portion 221 and the second portion 222 are spaced apart along the first direction X, and a portion of the first sealing portion 2112 is exposed between the first portion 221 and the second portion 222 to reserve space for the expansion of the first sealing portion 2112 and reduce the possibility that gas in the first sealing portion 2112 may damage the first sealing portion 2112 or the bracket 220.

[0148] In some embodiments, the bracket 220 includes a first connecting portion 223, which connects the first portion 221 and the second portion 222, thereby improving the stress performance of the bracket 220 and making the overall structure of the bracket 220 more stable. This makes the coverage state of the first portion 221 and the second portion 222 on the first sealing portion 2112 more stable, and reduces the probability that the first portion 221 and the second portion 222 will shift relative to the first sealing portion 2112 or even detach from the first sealing portion 2112.

[0149] In some embodiments, the bracket 220 includes a second connecting portion 224, which connects the first portion 221 and the second portion 222, thereby improving the stress performance of the bracket 220 and making the overall structure of the bracket 220 more stable. This makes the coverage state of the first portion 221 and the second portion 222 on the first sealing portion 2112 more stable, and reduces the probability that the first portion 221 and the second portion 222 will displace relative to the first sealing portion 2112 or even detach from the first sealing portion 2112.

[0150] In some embodiments, the bracket 220 includes a first connecting portion 223 and a second connecting portion 224, which are spaced apart along a third direction Z.

[0151] In some embodiments, the first part 221, the second part 222, the first connecting part 223, and the second connecting part 224 may be integrally formed.

[0152] In other embodiments, the first part 221, the second part 222, the first connecting part 223, and the second connecting part 224 can also be fixedly connected by means of adhesive, snap-fit, etc.

[0153] In some embodiments, the first connecting portion 223 is connected to one end of the first portion 221 and the second portion 222 along the third direction Z, and the second connecting portion 224 is connected to the other end of the first portion 221 and the second portion 222 along the third direction Z.

[0154] In other embodiments, the first connecting portion 223 and the second connecting portion 224 may also be connected between the two ends of the first portion 221 and the second portion 222 along the third direction Z, making the structure of the bracket 220 more stable and reducing the probability of deformation.

[0155] In some embodiments, the first connecting portion 223 and the second connecting portion 224 protrude from the battery cell 210 in the third direction Z. This ensures that when the battery cell unit 200 is subjected to force in the third direction Z, the bracket 220 is subjected to force before the battery cell 210, thus protecting the battery cell 210.

[0156] In some embodiments, the temperature detection element 13 is disposed on the cell unit 200 near the middle of the battery module 10.

[0157] Among the multiple battery cell assemblies 12, the battery cell unit 200 located near the center of the battery module 10 generates more heat. Therefore, by placing the temperature detection element 13 on the battery cell unit 200 located near the center of the battery module 10, the temperature detection element 13 can detect the temperature of the battery cell unit 200 with the highest temperature. This helps to improve the accuracy of temperature detection of the battery cell 210, so as to reduce the temperature of the battery module 10 in a timely manner by controlling the charging and discharging of the battery cell 210, and further reduce the possibility of thermal runaway of the battery module 10.

[0158] In some embodiments, the number of temperature detection elements 13 can be multiple, and multiple temperature detection elements 13 are respectively disposed on multiple battery cell units 200, wherein at least one temperature detection element 13 is disposed close to the center of the battery module 10, thereby making the detection results more accurate.

[0159] See Figures 8, 9 and 15. Figure 15 is a partially enlarged structural diagram of point D of the battery pack in Figure 8.

[0160] In some embodiments, the cell housing 211 includes a second sealing portion 2114, with the first sealing portion 2112 and the second sealing portion 2114 located at opposite ends of the cell housing 211 along a first direction X. The cell 210 includes a second electrode terminal 213, which is connected to an electrode assembly and extends from the second sealing portion 2114. This allows other mechanisms to be electrically connected to the electrode assembly via the second electrode terminal 213.

[0161] In some embodiments, the battery cell 200 includes a second bracket 230 connected to a second sealing portion 2114. In some embodiments, the bracket 220 and the second bracket 230 have the same structure.

[0162] In some embodiments, the support 220 and the second support 230 are similar, so repeated descriptions of the same or similar construction as the support 220 in the foregoing embodiments will be omitted. Hereinafter, we will focus on structures that are different from the foregoing embodiments.

[0163] In some embodiments, the second support 230 is provided with a notch 231, and a portion of the second sealing portion 2114 is located within the notch 231. When the cell 210 expands, the pressure inside the cell 210 can be discharged through the portion of the second sealing portion 2114 within the notch 231, which is beneficial for depressurizing the cell 210 and reduces the possibility of thermal runaway of the cell unit 200.

[0164] In some embodiments, the notch 231 and the temperature sensing element 13 are provided on different supports to reduce the risk of damage to the temperature sensing element 13 during depressurization.

[0165] In some embodiments, the bracket 220 may be provided with a notch 231 as shown in the second bracket 230.

[0166] In some embodiments, the second bracket 230 is not provided with the protrusion 2212 shown in FIG9.

[0167] In some embodiments, along the second direction Y, the support 220 is configured to be movable relative to the bottom wall 120. This allows the cell 210 to move within the housing 11 when it expands, reducing the problem of excessive internal pressure in the cell 210 caused by its inability to move and thus limiting its expansion.

[0168] In some embodiments, the bottom wall 120 carries the battery cell unit 200.

[0169] In some embodiments, the battery module 10 includes a structural member 15 disposed between the bottom wall 120 and the cell assembly 12, and in contact with the cell assembly 12.

[0170] In some embodiments, the coefficient of friction between the bracket 220 and the structural member 15 is less than the coefficient of friction between the cell unit 200 and the bottom wall 120. Along the second direction Y, the cell unit 200 is configured to move on the structural member 15. Compared to a battery module where the cell assembly 12 is in direct contact with the housing 11 (where the cell unit 200 directly rubs against the bottom wall 120), the battery module 10 of this application, when the cell unit 200 expands and moves on the structural member 15, exhibits less friction between the cell unit 200 and the structural member 15. This results in less wear on the cell unit 200, a lower likelihood of breakage, and a reduced possibility of leakage or short circuits, thereby extending the service life of the battery module 10.

[0171] In some embodiments, an insulating layer is provided on the surface of the structural member 15 facing the cell assembly 12 to enhance the insulation between the cell assembly 12 and the bottom wall 120. Referring to Figures 1 and 2, in some embodiments, the bottom wall 120 is provided with two first limiting portions 121, which extend along the second direction Y and are spaced apart along the first direction X. A portion of the cell assembly 12 is disposed between the two first limiting portions 121 along the first direction X. This allows the two first limiting portions 121 to limit the movement of the cell assembly 12, enabling the cell assembly 12 to move along the second direction Y during expansion, thus making the overall structure of the battery module 10 more stable.

[0172] In some embodiments, the first limiting portion 121 may be formed by recessing a portion of the bottom wall 120 into the cell assembly 12, which is easy to manufacture.

[0173] In other embodiments, the first limiting part 121 may also be fixed to the bottom wall 120 by means of bonding, welding or other methods.

[0174] In some embodiments, the top wall 110 is provided with two second limiting portions 111, which extend along the second direction Y and are spaced apart along the first direction X. A portion of the battery cell assembly 12 is disposed between the two second limiting portions 111 along the first direction X. This allows the two second limiting portions 111 to limit the battery cell assembly 12, enabling the battery cell assembly 12 to move along the second direction Y during expansion, thus making the overall structure of the battery module 10 more stable.

[0175] In some embodiments, the second limiting portion 111 may be formed by recessing a portion of the top wall 110 into the cell assembly 12, which is easy to manufacture.

[0176] In other embodiments, the second limiting part 111 can also be fixed to the top wall 110 by means of bonding, welding or other methods.

[0177] Referring to Figures 1 and 2, this application embodiment provides a battery pack, which includes a front cover 20 and a battery module 10 provided in any of the above embodiments. The front cover 20 is connected to the housing 11.

[0178] In some embodiments, the front cover 20 can be made of a high-strength material, such as steel, aluminum alloy or other metal materials, so that the front cover 20 has high load-bearing capacity, thereby reducing the possibility of deformation or damage to the front cover 20 due to stress or environmental changes, and thus making the battery module 10 more reliable.

[0179] In other embodiments, the front cover 20 may also be made of high-strength non-metallic materials such as carbon fiber or rigid plastic.

[0180] In some embodiments, the housing 11 and the front cover 20 may be fixedly connected by a connector (e.g., screw).

[0181] In other embodiments, the housing 11 and the front cover 20 can also be fixedly connected by other means such as welding, bonding, or interference fit.

[0182] In some embodiments, the battery pack includes a circuit board 30, a front cover 20 having a second space, the circuit board 30 being disposed in the second space, and the circuit board 30 being connected to the cell assembly 12. The front cover 20 provides protection and dust prevention for the cell assembly 12 and the circuit board 30. The circuit board 30 enables control of the charging and discharging of the cell assembly 12.

[0183] In some embodiments, the front cover 20 is further provided with a connector 201, which is connected to the circuit board 30, so that an external device is electrically connected to the circuit board 30 through the connector 201.

[0184] In some embodiments, circuit board 30 may include a printed circuit board (PCB).

[0185] In other embodiments, circuit board 30 may include a flexible printed circuit (FPC).

[0186] In some embodiments, the temperature sensing element 13 can be electrically connected to the circuit board 30 via wires.

[0187] This application provides an electrical device, which includes a load and at least one battery pack provided in any of the above embodiments, the battery pack supplying power to the load.

[0188] The electrical equipment can be any of the aforementioned devices or systems that use battery packs.

[0189] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0190] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery module, characterized by, include: The casing has a first space. A battery cell assembly is disposed in the first space. The battery cell assembly includes a plurality of battery cell units. Each battery cell unit includes a battery cell and a support. Each battery cell includes a battery cell housing. The support covers at least a portion of the battery cell housing. A temperature sensing element is mounted on the bracket.

2. The battery module of claim 1, wherein, The battery cell also includes electrode terminals, and the battery cell housing includes a main body and a first sealing portion, with the electrode terminals extending from the first sealing portion out of the battery cell housing; The bracket covers at least a portion of the first sealing portion, and the electrode terminal extends from the bracket.

3. The battery module of claim 2, wherein, The bracket includes a first portion, the first sealing portion including an end remote from the body portion, the first portion covering at least a portion of the end portion; The temperature sensing element is disposed on the first part.

4. The battery module of claim 3, wherein, The first part includes a body and a protrusion, the protrusion protruding from the body and the body covering the end; The temperature sensing element is disposed on the protrusion.

5. The battery module of claim 4, wherein, The protrusion is provided with a groove, and the temperature sensing element is housed in the groove.

6. The battery module according to claim 4 or 5, characterized in that The electrode terminal includes a first segment, which is connected to the protrusion; The first segment includes a first surface and a second surface disposed opposite to each other, the first surface being connected to the protrusion and the second surface being exposed on the protrusion.

7. The battery module of any one of claims 2-6, wherein, At least a portion of the first sealing portion is exposed in the bracket.

8. The battery module of any one of claims 1-7, wherein, The battery module also includes a fixing component, through which the temperature detection component and the bracket are fixed.

9. The battery module of claim 8, wherein, The fastener is made of thermally conductive adhesive, and the thermal conductivity of the thermally conductive adhesive is 0.8 to 3.0 W / (m·K).

10. The battery module of any one of claims 1-9, wherein, The temperature sensing element and the bracket are interference-fitted.

11. The battery module of any one of claims 1-10, wherein, The temperature detection device includes a temperature detector and a wire. The temperature detector is connected to the wire, and the temperature detector and the wire are respectively fixed to the bracket. The wire is in a stretchable state.

12. The battery module of claim 11, wherein, The battery module further includes an elastic element located at at least one end of the cell assembly along the first direction; The wire is fixed to the elastic element.

13. The battery module of claim 12, wherein, The elastic element includes a base, a buffer portion, and a connecting portion. The base is connected to the cell assembly, the buffer portion connects the connecting portion and the base, the buffer portion is configured to provide expansion space for the cell assembly, and the connecting portion is fixed to the housing. The wire is fixed to the connection part.

14. The battery module of any one of claims 2-13, wherein, The bracket includes a second part, the main body includes a first wall connected to the first sealing part, and the second part covers at least a portion of the first wall; The temperature sensing element is disposed on the second part.

15. The battery module of any one of claims 1-14, wherein, The battery cell is a pouch cell.

16. The battery module of any one of claims 1-15, wherein, The bracket is integrally formed on the battery cell.

17. The battery module of any one of claims 1-16, wherein, The housing includes a top wall and a bottom wall disposed opposite each other along a third direction; Along the second direction, the support is configured to be movable relative to the bottom wall; The second direction is perpendicular to the third direction.

18. The battery module of claim 17, wherein, The battery module includes a structural component disposed between the bottom wall and the cell assembly, and in contact with the cell assembly; Wherein, the coefficient of friction between the bracket and the structural member is less than the coefficient of friction between the battery cell and the bottom wall, and the battery cell is configured to move on the structural member along the second direction.

19. A battery pack, characterized by It includes a front cover and a battery module as described in any one of claims 1 to 18, wherein the front cover is connected to the housing.

20. The battery pack of claim 19, wherein, The battery pack includes a circuit board, and the front cover has a second space; The circuit board is located in the second space and is connected to the battery cell assembly.

21. An electrical device, comprising: It includes a load and at least one battery pack as described in claim 19 or 20, the battery pack supplying power to the load.

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