Battery module and electric equipment

Abstract

The utility model discloses a battery module and electric equipment, and relates to the technical field of batteries. The battery module comprises a plurality of battery cells which are sequentially arranged along the thickness direction; the battery cell comprises a packaging shell and a pole piece assembly arranged in the packaging shell, and the packaging shell comprises a top surface and a bottom surface which are positioned at the two ends of the battery cell in the length direction; each heat absorption phase change piece is attached to the at least one battery cell in the thickness direction, a first distance is formed between the edge, close to the top surface, of the heat absorption phase change piece and the top surface of the battery cell in the length direction of the battery cell, a second distance is formed between the edge, close to the bottom surface, of the heat absorption phase change piece and the bottom surface of the battery cell, and the first distance is smaller than the second distance; a pressure detection device is arranged in the heat absorption phase change piece. Wherein the heat absorption phase change piece can absorb heat to reduce the temperature rise of the battery cells, and can equalize the temperature of the battery cells to reduce the temperature difference between the battery cells, so that the thermal runaway problem can be reduced, and the battery cells can be deformed or expanded to a certain extent in the thermal runaway process.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery module and electrical equipment. Background Technology

[0002] The optimal operating temperature range for lithium batteries is approximately 25℃-40℃. Higher temperatures accelerate electrode degradation and electrolyte decomposition, and in extreme cases, thermal runaway may even occur, posing a safety hazard. Therefore, monitoring and early warning systems for thermal runaway in lithium batteries are necessary. Traditional thermal runaway warning systems directly collect cell temperature and voltage data; however, these parameters typically exhibit a certain lag, resulting in delayed thermal runaway warnings.

[0003] Therefore, how to reduce the risks caused by thermal runaway of lithium batteries is a technical problem that needs to be solved by those skilled in the art. Utility Model Content

[0004] In view of this, the purpose of this utility model is to provide a battery module and electrical equipment that can reduce the risk of thermal runaway of lithium batteries.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A battery module includes: a plurality of battery cells arranged sequentially along a thickness direction; each battery cell includes a packaging shell and an electrode assembly disposed within the packaging shell, the packaging shell including a top surface and a bottom surface located at both ends along the length direction of the battery cell; at least one heat-absorbing phase change element, each heat-absorbing phase change element being attached to at least one battery cell in the thickness direction, and along the length direction of the battery cell, the edge of the heat-absorbing phase change element near the top surface has a first distance from the top surface of the battery cell, and the edge of the heat-absorbing phase change element near the bottom surface has a second distance from the bottom surface of the battery cell, the first distance being smaller than the second distance; a pressure detection device is disposed in the heat-absorbing phase change element, and the heat-absorbing phase change element is attached between two adjacent battery cells.

[0007] Preferably, the device further includes a heating element, which is attached to at least one of the battery cells in the thickness direction.

[0008] Preferably, the heating device further includes a temperature protection device to control the heating element to cut off power when the temperature at a preset position exceeds a preset threshold temperature.

[0009] Preferably, a plurality of heating elements are provided in the thickness direction, and in the thickness direction, the power density of the heating element near the edge of the battery cell is greater than the power density of the heating element near the middle of the battery cell.

[0010] Preferably, a mounting position is formed between every two adjacent battery cells, and in the thickness direction, the heat-absorbing phase change element is disposed in a portion of the mounting positions, while the heating element is disposed in the remaining mounting positions.

[0011] Preferably, a plurality of heating elements are provided in the thickness direction; the heating device further includes connecting arms respectively connected between each pair of adjacent heating elements.

[0012] Preferably, in the thickness direction, each of the heating elements consists of two first heating elements disposed on the side and each of the second heating elements disposed in the middle; the two ends of the second heating element in the first direction and on both sides in the thickness direction are respectively connected to the connecting arms, so as to connect the heating elements on both sides of the second heating element; wherein, the first direction is perpendicular to the thickness direction.

[0013] Preferably, a plurality of connecting arms are provided between each adjacent heating element in a spaced-out arrangement.

[0014] Preferably, it also includes a temperature detection device to detect the temperature in the battery module.

[0015] An electrical device, including the battery module described above.

[0016] The battery module provided by this utility model includes: a plurality of battery cells arranged sequentially along the thickness direction; at least one heat-absorbing phase change element, each heat-absorbing phase change element being attached to at least one battery cell in the thickness direction, and a pressure detection device being provided in the heat-absorbing phase change element.

[0017] This type of battery module incorporates a heat-absorbing phase change element. This element absorbs heat to reduce the temperature rise of the battery cells and promotes uniform cell temperature to minimize temperature differences between cells, thus reducing the risk of thermal runaway. Furthermore, since cells deform or expand during thermal runaway, monitoring the pressure between cells using a pressure detection device allows for timely detection of cell deformation, providing more immediate warnings of thermal runaway. This enables timely safety intervention before reaching the threshold for thermal runaway, effectively reducing the risks associated with lithium battery thermal runaway. Additionally, integrating the pressure detection device into the heat-absorbing phase change element also improves space utilization.

[0018] Furthermore, the presence of both a first and a second spacing allows for the saving of heat-absorbing phase change element material while preventing interference between the heat-absorbing phase change element and the bent welding of the electrode tabs at the top of the cell. Since the electrode tabs are located on the top surface of the cell, and the heat generated by the electrode tabs is greater than that on the bottom surface, the first spacing is smaller than the second spacing. This allows the heat-absorbing phase change element to be positioned as close as possible to the electrode tabs, improving the cell's heat dissipation efficiency and preventing interference with the potting compound at the bottom of the cell. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0020] Figure 1 An exploded view of a specific embodiment of the battery module provided by this utility model;

[0021] Figure 2 A partial exploded view of the battery module according to a specific embodiment of this utility model;

[0022] Figure 3 for Figure 2 Assembly process diagram;

[0023] Figure 4 This is a schematic diagram of the heating element in a specific embodiment of the battery module provided by this utility model;

[0024] Figure 5 A schematic diagram of the heat-absorbing phase change component in a specific embodiment of the battery module provided by the utility model;

[0025] Figure 6 A simplified diagram showing the arrangement of the heat-absorbing phase change component, the heating component, and the battery cell in a specific embodiment of the battery module provided by the utility model.

[0026] Figure label:

[0027] Electrode plate 1;

[0028] Cell group 2, cell 21;

[0029] 3. Inter-ear foam;

[0030] Side foam 4;

[0031] Bottom foam 5;

[0032] 6 heat-absorbing phase change element;

[0033] Pressure detection device 7;

[0034] Fixing sleeve 8;

[0035] Temperature protection device 9;

[0036] Heating device 10, first heating element 101, second heating element 102, heating element 103, connecting arm 104;

[0037] Temperature monitoring device 11. Detailed Implementation

[0038] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0039] The core of this utility model is to provide a battery module and electrical equipment that can reduce the risk of thermal runaway of lithium batteries.

[0040] For a specific embodiment of this practical battery module, please refer to 1 to 2010. Figure 6 It includes the battery body, which comprises the cell assembly 2 and the heat-absorbing phase change component 6. Specifically, the battery module can be a lithium battery module.

[0041] The cell assembly 2 includes multiple cells 21 arranged sequentially along the thickness direction X. The thickness direction X typically corresponds to the thickness direction of the cell 21. A tab plate 1 is provided at one end of the battery body in a second direction Z perpendicular to the thickness direction X, and each cell 21 in the cell assembly 2 is connected to the tab plate 1.

[0042] The heat-absorbing phase change element 6 is at least one, and specifically, one or more can be provided. Each heat-absorbing phase change element 6 is attached to at least one battery cell 21 in the thickness direction X, such as... Figure 6 As shown, in the thickness direction X, the battery cell 21 and the heat-absorbing phase change element 6 are stacked sequentially. The heat-absorbing phase change element 6 can absorb heat to reduce the temperature rise of the battery cell 21, and can also uniformly heat the battery cell 21 to reduce the temperature difference between the battery cells 21, improve the thermal balance between the battery cells 21, and help reduce thermal runaway problems.

[0043] A pressure detection device 7 is installed in the endothermic phase change element 6, and the battery cell 21 can be pressed against the pressure detection device 7 in the thickness direction X. Since the battery cell 21 will deform or expand during thermal runaway, the pressure detection device 7 monitors the pressure between the battery cells 21, allowing for timely detection of deformation issues and providing more immediate early warning of thermal runaway. This enables timely safety measures to be taken before reaching the thermal runaway threshold, effectively reducing the risks associated with lithium battery thermal runaway. Furthermore, integrating the pressure detection device 7 into the endothermic phase change element 6 also improves space utilization.

[0044] In this type of battery module, the heat-absorbing phase change element 6 absorbs heat to reduce the occurrence of thermal runaway, and in the event of thermal runaway, the pressure detection device 7 can provide more immediate early warning information, which can effectively reduce the risk of thermal runaway of lithium battery.

[0045] Additionally, the battery cell 21 includes a packaging shell and electrode assemblies disposed within the packaging shell. The packaging shell includes a top surface and a bottom surface located at both ends along the length of the battery cell. The electrode tabs of the battery cell extend from deep within the top surface of the battery cell and connect to the electrical system of the battery module, such as the BMS, for external discharge or charging. Along the length of the battery cell 21, the edge of the heat-absorbing phase change element 6 near the top surface has a first distance from the top surface of the battery cell 21, and the edge of the heat-absorbing phase change element 6 near the bottom surface has a second distance from the bottom surface of the battery cell 21. The first distance is smaller than the second distance. Specifically, along the length of the battery cell 21, the edges at both ends of the heat-absorbing phase change element 6 are located between the top and bottom surfaces of the battery cell 21, and in this direction, the length of the heat-absorbing phase change element 6 is less than the length of the battery cell 21.

[0046] The presence of a first spacing and a second spacing saves material for the heat-absorbing phase change element while preventing interference caused by bending and welding the heat-absorbing phase change element 6 to the tabs at the head of the cell 21. Since the top surface of the cell 21 has tabs, which generate more heat than the bottom surface, the first spacing is smaller than the second spacing. This allows the heat-absorbing phase change element 6 to be positioned as close as possible to the tabs, improving the heat dissipation efficiency of the cell 21 and preventing interference with the potting compound at the bottom of the cell 21.

[0047] The heat-absorbing phase change element 6 specifically includes a hydrogel. The hydrogel can be bonded to the surface of the corresponding cell 21 using double-sided adhesive or adhesive backing. The hydrogel has a high specific heat capacity and the characteristic of evaporative heat absorption, which can significantly reduce the temperature rise of the cell 21 during high-rate discharge. During high-rate discharge, the temperature of the cell 21 is high, and the temperature difference between cells 21 is large. The high specific heat capacity and high latent heat of vaporization of the hydrogel absorb the heat from the cell 21, reducing the temperature rise of the cell 21. Furthermore, since the thermal conductivity of the hydrogel itself is not low, it can evenly distribute the temperature of the cell 21, reducing the temperature difference between cells 21.

[0048] Specifically, the hydrogel is selected with a water content of over 90%, a specific heat capacity of 4200 J / (kg-K), a large sensible heat capacity, a latent heat of vaporization exceeding 2000 kJ / kg (more than 10 times that of traditional phase change materials), a thermal conductivity higher than 0.3 W / (mK), and a compressibility greater than 40%. Furthermore, the hydrogel thickness is 0.5 mm-6 mm, and the evaporation temperature is selectable, generally 50℃-60℃ is suitable. For example, in this embodiment, the selected hydrogel has a thickness of 2 mm, a water content of 93%, a cross-sectional area of ​​80% of the large surface area of ​​the battery cell 21, an evaporation temperature of 50℃-60℃, a water content of over 90%, and an overall thermal conductivity greater than 0.3 W / (mK), thereby enhancing heat exchange between the battery cells 21 and improving temperature uniformity among them.

[0049] Specifically, polyacrylamide can be used as a framework in the hydrogel to provide some support, and it is filled and sealed with water and specific ions. The hydrogel is adhered to the surface of adjacent battery cells 21 using double-sided adhesive.

[0050] Specifically, the shape of the hydrogel can be customized according to actual needs. For example... Figure 3 and Figure 5 As shown, the hydrogel is a rectangular hydrogel adapted to the shape of the square soft-pack battery cell 21. It can also be designed into other shapes, as long as there is enough area to adhere to the surface of the battery cell 21.

[0051] Of course, in other embodiments, the heat-absorbing phase change element 6 can also be made of other selectable heat-absorbing phase change materials, including inorganic polymers, solid phase change materials, non-fluidized colloidal phase change materials, etc.

[0052] In the assembly of the heat-absorbing phase change component 6, such as Figure 3 and Figure 6 As shown, each cell 21 has a heat-absorbing phase change element 6 attached to at least one side in the thickness direction X. Each cell 21 has a corresponding pressure detection device 7 for pressure detection, which can take into account the pressure changes of all cells 21, thereby improving the accuracy of early warning of thermal runaway. At the same time, the temperature between each two adjacent cells 21 can be balanced by the heat-absorbing phase change element 6, which can comprehensively reduce the uneven temperature distribution between cells 21 and help slow down the overall aging of the battery.

[0053] Specifically, each battery cell 21 has a heat-absorbing phase change element 6 on one side in the thickness direction X. In this case, a battery cell 21 absorbs heat and cools down through only one heat-absorbing phase change element 6, which can reduce space occupation. Of course, in other embodiments, in order to improve heat absorption efficiency, heat-absorbing phase change elements 6 can also be provided on both sides in the thickness direction X of the battery cell 21, if space permits.

[0054] In addition, the heat-absorbing phase change element 6 is bonded between two adjacent cells 21, enabling it to absorb heat from adjacent cells 21 simultaneously, which is beneficial for battery miniaturization. Of course, in other embodiments, the heat-absorbing phase change element 6 may also be bonded to only one cell 21.

[0055] In the setting of the pressure detection device 7, a pressure sensor, such as a resistive thin-film pressure sensor, is selected. When the surface pressure of the resistive thin-film pressure sensor increases, the corresponding output resistance decreases. Thus, by acquiring the resistance of the thin-film pressure sensor in real time, the change in voltage of the battery cell 21 can be indirectly monitored. In addition, the resistive thin-film pressure sensor has the advantages of small footprint and high sampling accuracy. By indirectly monitoring the voltage of the battery cell 21, it can detect a sudden increase in the rate of pressure increase in a timely manner and issue an early warning signal. This helps to solve the problem of lagging monitoring of thermal runaway of battery cell 21 or the inability to cover at least one of all battery cells 21.

[0056] When assembled on the heat-absorbing phase change component 6, such as Figure 5 As shown, the detection part of the pressure detection device 7 can be centrally located on the endothermic phase change element 6, and the lead wire extends out of the endothermic phase change element 6 to electrically connect to the control device. Depending on the shape of the endothermic phase change element 6 and the actual available space, for example, the pressure detection device 7 can also be located on the edge of the surface of the endothermic phase change element 6 perpendicular to the thickness direction X.

[0057] To address the challenges of using lithium batteries in low-temperature environments, such as a sharp drop in operating voltage and usable capacity, and the resulting charging difficulties, the battery body also includes a heating device 10. When the cell 21 is at a low temperature and needs charging, the heating device 10 is first powered to preheat the cell 21. Once the temperature of the cell 21 rises to a certain value (e.g., 15°C), it is then charged at a higher rate, which can improve charging efficiency and shorten charging time.

[0058] In the heating device 10, such as Figure 3 , Figure 4 and Figure 6 As shown, the battery includes a heating element 103, which is specifically a heating film, but can also be a heating plate. The heating element 103 is attached to at least one battery cell 21 in the thickness direction X, thereby effectively heating the corresponding battery cell 21 from one side in the thickness direction X. At this time, in the battery body, the battery cell 21, the heating element 103, and the heat-absorbing phase change element 6 are stacked together in a predetermined arrangement order along the thickness direction X.

[0059] like Figure 1 As shown, the heating device 10 also includes a temperature protection device 9, which is electrically connected to the heating element 103. The temperature protection device 9 is used to control the heating element 103 to cut off power when the temperature at a preset position of the battery body exceeds a preset threshold temperature, thereby preventing overheating and improving safety during use.

[0060] like Figure 4 and Figure 6 As shown, multiple heating elements 103 are arranged in the thickness direction X, and the power density of the heating elements 103 near the edge of the battery cell 21 is greater than that of the heating elements 103 near the center of the battery cell 21 in the thickness direction X. Figure 4 For example, for each heating element 103, in the thickness direction X, the middle heating elements 103 are the second heating elements 102, specifically two can be set to heat the middle battery cell 21, and the two on the sides are the first heating elements 101 to heat the edge battery cells 21. Since the two outermost battery cells 21 have a faster heat dissipation rate in the thickness direction X, the power density of the first heating elements 101 is higher than that of the second heating elements 102. By using a non-uniform power density heating method, the temperature consistency of all battery cells 21 can be ensured, and the heating uniformity can be improved. Of course, depending on the actual needs of the battery cells 21, the number of heating elements 103 is not limited to four, and can also be other numbers, such as one, two, or five.

[0061] like Figure 4 and Figure 6 As shown, each battery cell 21 has a heating element 103 on at least one side in the thickness direction X to ensure that each battery cell 21 can be heated.

[0062] like Figure 4 and Figure 6 As shown, a mounting position is formed between every two adjacent battery cells 21. In the thickness direction X, a heat-absorbing phase change element 6 is installed in some mounting positions, and a heating element 103 is installed in the remaining mounting positions. This ensures that both the heat-absorbing phase change element 6 and the heating element 103 act on the battery cell 21, rather than engaging in meaningless interactions, thus improving the utilization rate of the heat-absorbing phase change element 6 and the heating element 103. Specifically, as... Figure 6 As shown, in each mounting position, the heat-absorbing phase change element 6 and the heating element 103 are arranged in a cross pattern along the thickness direction X, that is, one heat-absorbing phase change element 6, one heating element 103, one heat-absorbing phase change element 6, one heating element 103, and so on. In addition, the outer end face of the outermost cell 21 is provided with heat-absorbing phase change element 6 or heating element 103 along this cross pattern, ensuring that each cell 21 has a heat-absorbing phase change element 6 on one side and a heating element 103 on the other side along the thickness direction X.

[0063] by Figure 6 Taking the six battery cells 21 as an example, it has five mounting positions. Three mounting positions are each equipped with a hydrogel, and the remaining two mounting positions are equipped with a heating film. The hydrogel and the heating film are arranged in a cross pattern, and the outermost battery cell 21 is equipped with a heating film on its outer end face, which is different from the other battery cells 21.

[0064] like Figure 4As shown, the heating device 10 has an integrated structure, which facilitates processing. Specifically, the heating element 103 is a PI heating film, manufactured from PI (polyimide) film and metal wires through processes such as hot pressing. The PI heating film has a small thickness, with a maximum thickness of less than 0.2 mm. It has self-adhesive backing and can be directly attached to the surface of the corresponding battery cell 21. It also has high heating efficiency, enabling rapid heating of the battery cell 21. For multi-series and parallel battery cell arrangements, the PI heating film can be designed to wrap around the battery cell 21 for heating. Of course, depending on the different stacking structures of the battery cells 21, the heating element 103 can also adopt a split design; for example, the heating device 10 may include several separate heating films.

[0065] To achieve integrated installation of the heating device 10, such as Figure 4 As shown, the heating device 10 also includes connecting arms 104 respectively connected between each pair of adjacent heating elements 103. The structure is simple and easy to manufacture. It should be noted that, depending on actual needs, the connecting arms 104 and the heating elements 103 can be made of the same or different materials. Furthermore, the shapes of each connecting arm 104 can be the same or different. The connecting arms 104 can be used only for connection and not for heating; or, the connecting arms 104 and the heating elements 103 can be made of the same material and can be heated uniformly. Of course, in other embodiments, one heating element 103 can be used as a base, with the remaining heating elements 103 individually connected to it via connecting structures.

[0066] Additionally, connecting arms 104 are respectively connected to both ends of the second heating element 102 in the first direction Y and on both sides in the thickness direction X, for connecting the heating elements 103 on both sides of the second heating element 102. In this case, the heating elements 103 include at least three. The first direction Y is a direction perpendicular to the thickness direction X. For example, the heating elements 103 can all be identical rectangular structures, and the first direction Y is the width direction of this rectangular structure. In this case, as... Figure 4 As shown, each heating element 103 is connected by a connecting arm 104 to form a serpentine structure, which facilitates the molding of the integrated heating device 10. Specifically, the connecting arm 104 and the heating element 103 can be formed by bending. In addition, the connecting arms 104 are arranged crosswise in the thickness direction X, so that the connecting arms 104 can play a positioning role at different positions in the thickness direction X, which can improve the positioning capability.

[0067] In addition, multiple connecting arms 104 are provided between each adjacent heating element 103 in a spaced-out manner, specifically two arms can be provided to ensure the connection strength between adjacent heating elements 103. Specifically, between each pair of adjacent heating elements 103, each connecting arm 104 is arranged sequentially along the second direction Z, and the second direction Z, the first direction Y, and the thickness direction X are perpendicular to each other.

[0068] The battery module also includes a temperature detection device, specifically an NTC, located on the battery body. This temperature detection device can detect the temperature at designated locations within the battery body, including during charging, thus protecting the battery. Furthermore, in other temperature-related controls, such as the start / stop control of the heating device 10, the monitoring results from the temperature detection device can also be used.

[0069] In addition, the temperature protection device 9 can also have a temperature detection function. During the heating process of the heating element 103, if the NTC fails and causes the heating element 103 to continue heating, the temperature protection device 9 will perform a two-stage protection function. When the temperature protection device 9 detects that the temperature has reached the set threshold, it will cut off the power supply to the heating device 10. Both the NTC and the temperature protection device 9 can be arranged at the peak position of the battery cell 21.

[0070] like Figure 1 As shown, in order to improve the stability of the battery body structure and overcome the deformation problem of the battery body caused by the expansion and deformation of the cell 21, the battery module also includes a fixing sleeve 8. The fixing sleeve 8 wraps around the battery body so as to fix the battery body in the thickness direction X. Specifically, it can provide a constraint force in the thickness direction X to fix all the cells 21, all the heat-absorbing phase change elements 6 and the heating device 10 in the thickness direction X. Of course, it can also include constraint forces in other directions.

[0071] Specifically, the fixing sleeve 8 is made of acetate cloth, and during the assembly process, such as Figure 1 and Figure 2 As shown, after the battery cell 21 is stacked with the heating film and hydrogel, it is tightly wrapped with acetate cloth. Acetate cloth is essentially a type of tape, with its base material being cellulose acetate cloth coated with acrylic flame-retardant adhesive. The thickness of the acetate cloth is 0.12mm.

[0072] The number of fixed sleeves 8 can be set according to actual needs, such as... Figure 1 As shown, two can be set, located at both ends of the battery body in a preset direction perpendicular to the thickness direction X, or one can be set and located in the middle of the preset direction, or more fixing sleeves 8 can be used according to the length of the cell 21 in the preset direction.

[0073] like Figure 1As shown, the battery module also includes foam for cushioning and insulation. Specifically, it includes inter-tab foam 3, side foam 4, and bottom foam 5. During assembly, after the fixing sleeve 8 fixes the battery body, the tab plate 1 and the cell 21 are laser welded to one end of the battery body. Then, the inter-tab foam 3 is inserted between the tab plate 1 and the cell 21. The side foam 4 is pasted around the battery body, and the bottom foam 5 is pasted to the other end of the battery body. The NTC is fixed to the battery body with thermally conductive adhesive, completing the module manufacturing.

[0074] In addition to the aforementioned battery module, this utility model also provides an electrical device that includes a battery module for supplying power to at least some of the electrical components within the device. Specifically, the battery module can be any of the battery modules provided in the above embodiments, and the beneficial effects can be referred to the respective embodiments above. This electrical device can be a power device, communication device, medical device, transportation device, etc. The structure of other parts of this electrical device is described in the prior art and will not be repeated here.

[0075] It should be noted that when an element is referred to as "fixing" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as "connecting" another element, it can be directly connected to the other element or there may be an intervening element. Furthermore, in the description of this utility model, unless otherwise stated, "multiple," "multiple roots," and "multiple groups" mean two or more.

[0076] The terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated.

[0077] 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 invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0078] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0079] The battery module and electrical equipment provided by this utility model have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this utility model. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core ideas of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principles of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A battery module, characterized by, The battery module comprises: a plurality of battery cells (21) arranged in sequence in a thickness direction (X); each battery cell comprises a packaging shell and a pole piece assembly arranged in the packaging shell, and the packaging shell comprises a top surface and a bottom surface located at two ends of the battery cell in a length direction of the battery cell; at least one heat-absorbing phase change member (6), each heat-absorbing phase change member (6) is arranged in abutment with at least one battery cell (21) in the thickness direction (X), and in the length direction of the battery cell, the heat-absorbing phase change member (6) has a first spacing from the top surface of the battery cell near an edge of the top surface, and the heat-absorbing phase change member (6) has a second spacing from the bottom surface of the battery cell near an edge of the bottom surface, and the first spacing is smaller than the second spacing; a pressure detection device (7) is arranged in the heat-absorbing phase change member (6), and the heat-absorbing phase change member (6) is arranged in abutment between two adjacent battery cells (21).

2. The battery module of claim 1, wherein, The battery module further comprises a heating device (10), and the heating device (10) comprises a heating member (103) arranged in abutment with at least one battery cell (21) in the thickness direction (X).

3. The battery module of claim 2, wherein, The heating device (10) further comprises a temperature protection device (9) configured to control the heating member (103) to be powered off when the temperature at a preset position is greater than a preset threshold temperature.

4. The battery module of claim 2, wherein, A plurality of heating members (103) are arranged in the thickness direction (X), and in the thickness direction (X), the power density of the heating member (103) near the edge of the battery cell (21) is greater than the power density of the heating member (103) near the middle of the battery cell (21).

5. The battery module of claim 2, wherein, Each adjacent two battery cells (21) form an installation position, and in the thickness direction (X), the heat-absorbing phase change member (6) is arranged in part of the installation positions, and the heating member (103) is arranged in the remaining installation positions.

6. The battery module of claim 2, wherein, A plurality of heating members (103) are arranged in the thickness direction (X); the heating device (10) further comprises a connecting arm (104) connected between each adjacent two heating members (103).

7. The battery module of claim 6, wherein, In the thickness direction (X), each heating member (103) is sequentially arranged as two first heating members (101) arranged at edges and each second heating member (102) arranged at a middle part; the two ends of the second heating member (102) in a first direction (Y) and the two sides of the second heating member (102) in the thickness direction (X) are respectively connected with the connecting arm (104) for connecting the heating members (103) on both sides of the second heating member (102); wherein the first direction (Y) is perpendicular to the thickness direction (X).

8. The battery module of claim 6, wherein, A plurality of connecting arms (104) are arranged in a spaced manner between each adjacent heating member (103).

9. The battery module of any one of claims 1 to 8, wherein, The battery module further comprises a temperature detection device (11) configured to detect the temperature in the battery module.

10. An electric device, characterized by The battery module comprises any one of claims 1 to 9. The battery module comprises any one of claims 1 to 9.

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