Battery assembly, electronic equipment and vehicle

Abstract

The embodiment of the utility model provides a battery assembly, electronic equipment and a vehicle. The battery assembly comprises a battery cell; the battery protection plate is electrically connected with the battery cell and is positioned at the end part of the battery cell; the temperature rise monitoring device comprises an expansion part, a movable part and a first contact, the movable part is connected with the first contact and is in transmission connection with the expansion part, the expansion part is in heat conduction connection with the outer wall surface of the battery cell, the first contact and the movable part are located on the two sides of the battery protection plate in the first direction respectively, and the movable part and the expansion part are located in the middle of the battery cell; the expansion piece is used for driving the movable piece to move towards the side away from the battery cell in the first direction when heated to expand, and therefore the first contact is driven to be close to the battery protection plate to be electrically connected with the battery protection plate. Through the arrangement, the temperature change in the middle of the battery cell is monitored in real time, so that the battery protection board can correspondingly adjust the charging strategy, control the charging current and prevent the battery cell from being overheated.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery assembly, an electronic device and a vehicle. Background Art

[0002] For batteries used in mobile phones, vehicles and other electrical equipment, as the charging power of the electrical equipment increases, the temperature of the battery gradually increases. In order to protect the electrical equipment, NTC (Negative Temperature Coefficient) devices on the battery protection board are often used to monitor the battery temperature. When the battery temperature is detected to be too high, the battery charging strategy can be controlled to reduce the battery temperature. However, because the NTC device can only be placed at the head of the battery and cannot monitor the temperature rise at the center of the battery, it is difficult for the electrical equipment to completely control the battery temperature. Utility Model Content

[0003] In view of this, the present application provides a battery assembly, an electronic device and a vehicle for effectively monitoring the temperature rise in the middle of the battery.

[0004] Specifically, the following technical solutions are included:

[0005] In a first aspect, an embodiment of the present application provides a battery assembly, including:

[0006] Battery cells;

[0007] A battery protection board, electrically connected to the battery cell and located at the end of the battery cell;

[0008] A temperature rise monitoring device, comprising an expansion member, a movable member and a first contact, wherein the movable member is connected to the first contact and the movable member is transmission-connected to the expansion member, the expansion member is thermally connected to the outer wall surface of the battery core, the first contact and the movable member are respectively located on both sides of the battery protection plate along a first direction, and the movable member and the expansion member are both located in the middle of the battery core;

[0009] Wherein, the expansion member is used to drive the movable member to move along the first direction toward the side away from the battery core when it expands due to heat, thereby driving the first contact to approach the battery protection board to be electrically connected to the battery protection board.

[0010] In an optional embodiment, the expansion member is formed with an extrusion groove, the movable member is located in the extrusion groove, the extrusion groove has an opening on the side away from the battery cell, and the extrusion groove is used to squeeze the movable member when the expansion member expands due to heat, so that the movable member moves along the first direction.

[0011] In an optional embodiment, there are multiple extrusion grooves and multiple movable parts, and at least one movable part is disposed in each extrusion groove.

[0012] In an optional embodiment, the expansion member is in the shape of a serpentine curved tube and has elastic deformation capability to form a plurality of the extrusion grooves, and a thermal expansion layer is provided inside the expansion member.

[0013] In an optional embodiment, at least a portion of the side wall of the movable member is curved, or the width of the portion of the movable member clamped by the expansion member gradually increases from a side close to the battery core to a side away from the battery core.

[0014] In an optional embodiment, the temperature rise monitoring device further includes a connecting member, wherein the connecting member connects the movable member and the first contact so that the movable member and the first contact move synchronously.

[0015] In an optional embodiment, the temperature rise monitoring device also includes a second contact, the second contact is connected to the connecting piece, the second contact and the movable piece are located on the same side of the battery cell in the first direction, and the second contact is configured to be magnetically connected to the battery cover.

[0016] In a second aspect, an embodiment of the present application provides an electronic device, comprising a middle frame and a battery assembly provided by any embodiment of the first aspect, wherein the middle frame is provided with a battery receiving groove, and the battery assembly is received in the battery receiving groove.

[0017] In an optional embodiment, the expansion member is thermally connected to the middle frame.

[0018] In an optional embodiment, the temperature rise monitoring device further includes a connecting member, wherein the connecting member connects the movable member and the first contact so that the movable member and the first contact move synchronously;

[0019] The temperature rise monitoring device further includes a second contact, and the second contact is connected to the connecting member;

[0020] The electronic device further comprises a battery cover, wherein the battery cover is used to close the battery receiving slot, and the battery cover is provided with a magnetic member, and the magnetic member is used to be magnetically connected to the second contact.

[0021] In a third aspect, an embodiment of the present application provides a vehicle, comprising a vehicle body and a battery assembly provided by any embodiment of the first aspect, wherein the vehicle body is provided with a battery receiving groove, and the battery assembly is received in the battery receiving groove.

[0022] In an optional embodiment, the expansion member is thermally connected to the vehicle body.

[0023] In an optional embodiment, the temperature rise monitoring device further includes a connecting member, wherein the connecting member connects the movable member and the first contact so that the movable member and the first contact move synchronously;

[0024] The temperature rise monitoring device further includes a second contact, and the second contact is connected to the connecting member;

[0025] The vehicle further comprises a battery cover, wherein the battery cover is used to close the battery receiving slot, and the battery cover is provided with a magnetic member, and the magnetic member is used to be magnetically connected to the second contact.

[0026] The beneficial effects of the technical solution provided in the embodiments of the present application include at least: by thermally connecting the expansion piece to the outer wall surface of the battery cell, and the movable piece and the expansion piece are both located in the middle of the battery cell, the temperature change in the middle of the battery cell can be monitored in real time; when the temperature in the middle of the battery cell rises, the expansion piece will receive the heat energy transmitted by the battery cell and physically dissipate the heat of the battery cell, and at the same time, the expansion piece will expand due to the heat and drive the movable piece to move along the first direction away from the battery cell, thereby driving the first contact to approach the battery protection board to be electrically connected to the battery protection board, so that the battery protection board can adjust the charging strategy accordingly, control the charging current, and prevent the battery cell from overheating, which is beneficial to improving the safety and reliability of battery components and electronic equipment, vehicles and other electrical equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0028] Figure 1 A schematic diagram of the structure of a battery assembly provided in an embodiment of the present application;

[0029] Figure 2 A schematic diagram of the structure of a temperature rise monitoring device provided in an embodiment of the present application;

[0030] Figure 3 A schematic diagram of the coordination between the first contact and the battery protection board provided in an embodiment of the present application;

[0031] Figure 4 A partial cross-sectional view of a battery assembly provided in one embodiment of the present application;

[0032] Figure 5 A partial cross-sectional view of a battery assembly provided according to another embodiment of the present application.

[0033] The reference numerals in the figures represent respectively:

[0034] 1-battery core; 2-battery protection board; 21-connection contact; 3-temperature rise monitoring device; 31-expansion member; 311-extrusion groove; 32-movable member; 33-first contact; 34-connector; 35-second contact;

[0035] 100 - middle frame; 101 - battery receiving slot.

[0036] The above drawings have shown clear embodiments of the present application, which will be described in more detail later. These drawings and text descriptions are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0038] The directional nouns involved in the embodiments of the present application, such as "upper", "lower", "side", etc., are generally represented by Figure 1 The relative relationship of the orientation shown in the figure is used as the basis, and these orientation terms are used only to more clearly describe the relationship between structures, not to describe absolute orientation. When the product is placed in different postures, the orientation may change, for example, "up" and "down" may be interchangeable.

[0039] Unless otherwise defined, all technical terms used in the embodiments of the present application have the same meanings as those generally understood by those of ordinary skill in the art. Some technical terms appearing in the embodiments of the present application are explained below.

[0040] In order to make the technical solutions and advantages of the present application more clear, the implementation methods of the present application will be further described in detail below with reference to the accompanying drawings.

[0041] like Figures 1 to 3 As shown, an embodiment of the present application provides a battery assembly, including a battery cell 1, a battery protection board 2 and a temperature rise monitoring device 3.

[0042] The battery assembly is used in electronic devices such as mobile phones, tablet computers, smart wearable devices, and laptop computers, and can also be used in vehicles such as electric vehicles and hybrid vehicles. For example, the middle frame 100 of the electronic device or the body of the vehicle is provided with a battery receiving slot 101, and the battery assembly is received in the battery receiving slot 101.

[0043] The battery protection board 2 is electrically connected to the battery cell 1 and is located at the end of the battery cell 1. Figure 1 As shown, the battery protection board 2 is located above the battery cell 1, so as to facilitate electrical connection with the positive and negative poles at the ends of the battery cell 1.

[0044] The temperature rise monitoring device 3 includes an expansion piece 31, a movable piece 32 and a first contact 33. The movable piece 32 is connected to the first contact 33 and the movable piece 32 is transmission-connected to the expansion piece 31. The expansion piece 31 is thermally connected to the outer wall surface of the battery cell 1. The first contact 33 and the movable piece 32 are respectively located on both sides of the battery protection plate 2 along the first direction Z, and the movable piece 32 and the expansion piece 31 are both located in the middle of the battery cell 1.

[0045] It is understandable that the expansion piece 31 is thermally connected to the outer wall of the battery cell 1, which means that the expansion piece 31 and the battery cell 1 can transfer heat through contact. When the temperature of the battery cell 1 increases due to the increase in charging time of the electrical equipment, the battery cell 1 can transfer heat to the expansion piece 31, and the heat dissipation of the battery cell 1 is achieved through the expansion piece 31. At the same time, the expansion piece 31 can also be thermally connected to other components to further transfer the heat and improve the heat dissipation effect of the battery cell 1. For example, the expansion piece 31 is thermally connected to the battery cell 1 and the middle frame 100 (or the vehicle body) respectively, and the heat generated by the battery cell 1 is transferred to the middle frame 100, effectively reducing the temperature of the battery cell 1.

[0046] Specifically, the first direction Z is the thickness direction of the battery cell 1, the second direction Y is the length direction of the battery cell 1, and the third direction X is the width direction of the battery cell 1. For example, Figure 1 The up-down direction in is the length direction of the battery cell 1 (i.e., the second direction Y). Figure 1 The left and right direction in the figure is the width direction of the battery cell 1 (i.e., the third direction X). Figure 1 The front-to-back direction is the thickness direction of the battery cell 1 (i.e., the first direction Z), wherein the length direction of the battery protection board 2 is parallel to the width direction of the battery cell 1, the width direction of the battery protection board 2 is parallel to the length direction of the battery cell 1, and the thickness direction of the battery protection board 2 is parallel to the thickness direction of the battery cell 1.

[0047] It can be understood that the middle portion of the battery cell 1 is the middle portion of the battery cell 1 in the length direction.

[0048] The expansion member 31 is used to drive the movable member 32 to move along the first direction Z to the side away from the battery core 1 when it expands due to heat, thereby driving the first contact 33 to approach the battery protection board 2 to be electrically connected to the battery protection board 2 .

[0049] The expansion member 31 can produce a volume change when the temperature changes, and push the movable member 32 to move along the first direction Z. For example, the expansion member 31 is filled with liquid butane, carbon dioxide and other substances. Its characteristic is that it can produce a large vapor pressure change when the temperature changes, so that the internal air pressure of the expansion member 31 increases and expands, thereby pushing the movable member 32 to move.

[0050] Exemplarily, the first contact 33 is located on the back side of the battery protection board 2 (i.e., the side close to the bottom wall of the battery receiving groove 101), and the expansion member 31 is located on the front side of the battery protection board 2 and the battery cell 1 (i.e., the side away from the bottom wall of the battery receiving groove 101). When the movable member 32 gradually moves away from the battery cell 1 along the first direction Z, the first contact 33 gradually approaches the battery protection board 2 until it contacts and is electrically connected to the battery protection board 2, triggering the battery protection function of the battery protection board 2, thereby adjusting the charging strategy of the electrical equipment through the battery protection board 2 and controlling the charging current.

[0051] It is understandable that if Figure 3 As shown, the back side of the battery protection board 2 is provided with a connection contact 21 for connecting with the first contact 33. When the connection contact 21 is electrically connected with the first contact 33, the battery protection board 2 will start the battery protection function by generating an electrical signal, a control instruction, etc., and then prevent the temperature of the battery cell 1 from rising by reducing the charging current, etc., which is conducive to reducing the temperature of the battery cell 1 and ensuring the safe use of the battery assembly.

[0052] The battery assembly provided in the embodiment of the present application can monitor the temperature change in the middle of the battery cell 1 in real time by thermally connecting the expansion piece 31 to the outer wall surface of the battery cell 1, and the movable piece 32 and the expansion piece 31 are both located in the middle of the battery cell 1; when the temperature in the middle of the battery cell 1 rises, the expansion piece 31 will receive the heat energy transmitted by the battery cell 1 and physically dissipate the heat of the battery cell 1, and at the same time, the expansion piece 31 expands due to the heat and drives the movable piece 32 to move along the first direction Z away from the battery cell 1, thereby driving the first contact 33 to approach the battery protection board 2 to be electrically connected to the battery protection board 2, so that the battery protection board 2 can adjust the charging strategy accordingly, control the charging current, and prevent the battery cell 1 from overheating, which is beneficial to improving the safety and reliability of the battery assembly and electrical equipment.

[0053] In a further embodiment, the expansion member 31 is formed with an extrusion groove 311, and the movable member 32 is located in the extrusion groove 311. The extrusion groove 311 has an opening on the side away from the battery cell 1. The extrusion groove 311 is used to squeeze the movable member 32 when the expansion member 31 expands due to heat, so that the movable member 32 moves along the first direction Z.

[0054] In this embodiment, an opening is provided on the side of the extrusion groove 311 away from the battery cell 1 , and when the expansion member 31 expands due to heat, the space enclosed by the extrusion groove 311 is compressed, generating an extrusion force on the movable member 32 , causing the movable member 32 to move toward the opening and away from the battery cell 1 .

[0055] Optionally, the opening size of the extrusion groove 311 gradually increases from the direction close to the battery cell 1 to the direction away from the battery cell 1, so that when the expansion member 31 expands due to heat, the side wall of the extrusion groove 311 can be used to guide the movable member 32 to move to the side away from the battery cell 1.

[0056] In a further embodiment, there are multiple extrusion grooves 311 and multiple movable members 32 , and at least one movable member 32 is disposed in each extrusion groove 311 .

[0057] Exemplarily, a plurality of movable parts 32 are spaced apart along the width direction of the battery cell 1. When the movable parts 32 and the first contact 33 are spaced apart along the length direction of the battery cell 1, it is ensured that the movable parts 32 can drive the first contact 33 to move, thereby preventing the movable parts 32 from being difficult to drive the first contact 33 to move due to the large distance between the movable parts 32 and the first contact 33.

[0058] In a specific embodiment, the expansion member 31 is in the shape of a serpentine curved tube and has elastic deformation capability to form a plurality of extrusion grooves 311 , and a thermal expansion layer is disposed in the expansion member 31 .

[0059] like Figure 2 As shown, the expansion member 31 has multiple sections, each section extends along the second direction Y, and the bend between two adjacent sections is located at the end of the expansion member 31 in the second direction Y, so that the expansion member 31 forms an "S"-shaped or serpentine structure, and an extrusion groove 311 is formed between two adjacent sections.

[0060] It can be understood that the movable part 32 is arranged in the extrusion groove 311 on the side away from the battery protection plate 2 at the bend, so that the movable part 32 can extend into the extrusion groove 311 from the opening above the two sections, thereby reducing the space occupied by the movable part 32 in the first direction Z.

[0061] Exemplarily, the expansion member 31 is a pipe with elastic deformation capability, such as a bellows, so as to facilitate deformation and compression of the movable member 32 .

[0062] Exemplarily, the expansion member 31 has an inner cavity filled with a thermal expansion layer, which is composed of materials such as liquid butane and carbon dioxide that can produce a large change in vapor pressure when the temperature changes, so that the internal air pressure of the expansion member 31 increases and expands, thereby driving the movable member 32 to move.

[0063] In a specific embodiment, Figure 4 As shown, the side wall of the movable member 32 is at least partially curved, or, as shown in FIG. Figure 5 As shown, the width of the portion of the movable member 32 clamped by the expansion member 31 gradually increases from the side close to the battery cell 1 to the side away from the battery cell 1 , so that the movable member 32 can easily move to the side away from the battery cell 1 under the extrusion force of the extrusion groove 311 .

[0064] It can be understood that the side walls of the movable member 32 are the walls on both sides of the movable member in the third direction X, and the side walls of the movable member 32 are used to contact with the expansion member 31; Figure 1 The third direction X in .

[0065] Exemplarily, the movable part 32 can be in a truncated cone, spherical, ellipsoidal, cylindrical or other shape, and the movable part 32 and the side wall of the extrusion groove 311 can be in point contact, line contact or arc surface contact, so that the movable part 32 can be easily pushed and move along the first direction Z.

[0066] In a specific embodiment, the temperature rise monitoring device 3 further includes a connecting member 34 , and the connecting member 34 connects the movable member 32 and the first contact 33 , so that the movable member 32 and the first contact 33 move synchronously.

[0067] For example, Figure 2 As shown, the connecting member 34 includes a plurality of connecting rods, and the movable member 32 and the first contact 33 are both fixed on the connecting member 34. A portion of the connecting member 34 is located on the side of the battery cell 1 away from the bottom wall of the battery receiving slot 101, and another portion is located on the side of the battery protection board 2 close to the bottom wall of the battery receiving slot 101, so as to ensure that the movable member 32 and the first contact 33 are respectively located on both sides of the battery protection board 2 in the first direction Z, so that the movable member 32 and the first contact 33 move synchronously.

[0068] In a further embodiment, the temperature rise monitoring device 3 also includes a second contact 35, which is connected to the connecting member 34, and the second contact 35 and the movable member 32 are located on the same side of the battery cell 1 in the first direction Z, and the second contact 35 is configured to be magnetically connected to the battery cover.

[0069] like Figure 2 As shown, the second contact 35 is arranged on the connecting member 34 and is located at the front side of the battery cell 1. The battery cover of the electronic device or the battery cover of the vehicle is used to close the battery receiving slot 101. The battery cover is provided with a magnetic member, and the second contact 35 is magnetic, and the magnetic member can be magnetically attracted to the second contact 35.

[0070] Specifically, after the temperature in the middle of the battery cell 1 rises and the expansion piece 31 expands due to the heat, the expansion piece 31 drives the movable piece 32 to move along the first direction Z, and the distance between the second contact 35 and the magnetic part of the battery cover is shortened and attracted to each other, which can better drive the first contact 33 to contact and electrically connect with the battery protection plate 2, and prevent the first contact 33 from being unable to fully drive the movement due to the large distance between the movable piece 32 and the first contact 33.

[0071] Optionally, a reset member such as a spring is provided between the expansion member 31 and the movable member 32. After the temperature of the battery cell 1 drops, the expansion member 31 contracts and drives the movable member 32 to retract along the first direction Z through the reset member, while overcoming the magnetic attraction between the second contact 35 and the battery cover, so that the temperature rise monitoring device 3 as a whole is reset to the initial state.

[0072] An embodiment of the present application further provides an electronic device, including a middle frame 100 and a battery assembly provided by any of the above embodiments, wherein the middle frame 100 is provided with a battery receiving groove 101 , and the battery assembly is received in the battery receiving groove 101 .

[0073] Specifically, the electronic device may be a mobile phone, a tablet computer, a smart wearable device, a laptop computer, or the like.

[0074] In a further embodiment, the expansion member 31 is thermally connected to the middle frame 100 .

[0075] In this embodiment, when the temperature of the battery cell 1 increases due to the increase in charging time of the electronic device, the battery cell 1 can transfer heat to the expansion member 31, and the expansion member 31 transfers the heat generated by the battery cell 1 to the middle frame 100, effectively reducing the temperature of the battery cell 1 and achieving rapid heat dissipation of the battery cell 1.

[0076] In a further embodiment, the temperature rise monitoring device 3 also includes a connecting member 34, which connects the movable member 32 and the first contact 33 so that the movable member 32 and the first contact 33 move synchronously. The temperature rise monitoring device 3 also includes a second contact 35, which is connected to the connecting member 34. The electronic device also includes a battery cover, which is used to close the battery receiving slot 101. The battery cover is provided with a magnetic member, which is used to magnetically connect to the second contact 35.

[0077] Specifically, after the temperature in the middle of the battery cell 1 rises and the expansion piece 31 expands due to the heat, the expansion piece 31 drives the movable piece 32 to move along the first direction Z, and the distance between the second contact 35 and the magnetic part of the battery cover is shortened and attracted to each other, which can better drive the first contact 33 to contact and electrically connect with the battery protection plate 2, and prevent the first contact 33 from being unable to fully drive the movement due to the large distance between the movable piece 32 and the first contact 33.

[0078] An embodiment of the present application further provides a vehicle, comprising a vehicle body and a battery assembly provided by any of the above embodiments, wherein the vehicle body is provided with a battery receiving groove 101 , and the battery assembly is received in the battery receiving groove 101 .

[0079] Specifically, the vehicle may be an electric vehicle, a hybrid vehicle, or the like.

[0080] In a further embodiment, the expansion element 31 is thermally connected to the vehicle body.

[0081] In this embodiment, when the temperature of the battery cell 1 increases due to the increase in charging time, the battery cell 1 can transfer heat to the expansion member 31, and the expansion member 31 transfers the heat generated by the battery cell 1 to the vehicle body, effectively reducing the temperature of the battery cell 1 and achieving rapid heat dissipation of the battery cell 1.

[0082] In a further embodiment, the temperature rise monitoring device 3 also includes a connecting member 34, which connects the movable member 32 and the first contact 33 so that the movable member 32 and the first contact 33 move synchronously. The temperature rise monitoring device 3 also includes a second contact 35, which is connected to the connecting member 34. The vehicle also includes a battery cover, which is used to close the battery receiving slot 101. The battery cover is provided with a magnetic member, which is used to magnetically connect to the second contact 35.

[0083] Specifically, after the temperature in the middle of the battery cell 1 rises and the expansion piece 31 expands due to the heat, the expansion piece 31 drives the movable piece 32 to move along the first direction Z, and the distance between the second contact 35 and the magnetic part of the battery cover is shortened and attracted to each other, which can better drive the first contact 33 to contact and electrically connect with the battery protection plate 2, and prevent the first contact 33 from being unable to fully drive the movement due to the large distance between the movable piece 32 and the first contact 33.

[0084] In the present application, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. The term "plurality" refers to two or more than two, unless otherwise clearly defined.

[0085] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the present application disclosed herein. The present application is intended to cover any variations, uses or adaptations of the present application, which follow the general principles of the present application and include common knowledge or customary techniques in the art that are not disclosed in the present application. The specification and examples are intended to be exemplary only.

[0086] It should be understood that the present application is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A battery assembly, characterized in that: The battery assembly comprises: Battery cell (1); A battery protection plate (2), electrically connected to the battery cell (1) and located at an end of the battery cell (1); A temperature rise monitoring device (3), comprising an expansion member (31), a movable member (32) and a first contact (33), wherein the movable member (32) and the first contact (33) are connected and the movable member (32) is transmission-connected to the expansion member (31), the expansion member (31) is heat-conductingly connected to the outer wall surface of the battery core (1), the first contact (33) and the movable member (32) are respectively located on both sides of the battery protection plate (2) along a first direction (Z), and the movable member (32) and the expansion member (31) are both located in the middle of the battery core (1); The expansion member (31) is used to drive the movable member (32) to move along the first direction (Z) to the side away from the battery cell (1) when it expands due to heat, thereby driving the first contact (33) to approach the battery protection board (2) to be electrically connected to the battery protection board (2).

2. The battery assembly according to claim 1, characterized in that: The expansion member (31) is formed with an extrusion groove (311), the movable member (32) is located in the extrusion groove (311), the extrusion groove (311) has an opening on a side away from the battery core (1), and the extrusion groove (311) is used to squeeze the movable member (32) when the expansion member (31) expands due to heat, so that the movable member (32) moves along the first direction (Z).

3. The battery assembly according to claim 2, characterized in that: There are a plurality of the extrusion grooves (311) and the movable parts (32), and at least one movable part (32) is disposed in each of the extrusion grooves (311).

4. The battery assembly according to claim 3, characterized in that: The expansion piece (31) is in the shape of a serpentine curved tube and has elastic deformation capability to form a plurality of extrusion grooves (311), and a thermal expansion layer is arranged inside the expansion piece (31).

5. The battery assembly according to claim 3, characterized in that: At least part of the side wall of the movable part (32) is in the shape of an arc surface, or the width of the part of the movable part (32) clamped by the expansion part (31) gradually increases from the side close to the battery core (1) to the side far from the battery core (1).

6. The battery assembly according to claim 1, characterized in that: The temperature rise monitoring device (3) further comprises a connecting member (34), wherein the connecting member (34) connects the movable member (32) and the first contact (33) so as to enable the movable member (32) and the first contact (33) to move synchronously.

7. The battery assembly according to claim 6, characterized in that: The temperature rise monitoring device (3) further comprises a second contact (35), wherein the second contact (35) is connected to the connecting member (34), the second contact (35) and the movable member (32) are located on the same side of the battery cell (1) in the first direction (Z), and the second contact (35) is configured to be magnetically connected to the battery cover.

8. An electronic device, characterized in that: The electronic device comprises a middle frame (100) and a battery assembly according to any one of claims 1 to 7, wherein the middle frame (100) is provided with a battery receiving groove (101), and the battery assembly is received in the battery receiving groove (101).

9. The electronic device according to claim 8, characterized in that: The expansion member (31) is thermally connected to the middle frame (100).

10. The electronic device according to claim 8, characterized in that: The temperature rise monitoring device (3) further comprises a connecting member (34), wherein the connecting member (34) connects the movable member (32) and the first contact (33) so that the movable member (32) and the first contact (33) move synchronously; The temperature rise monitoring device (3) further comprises a second contact (35), wherein the second contact (35) is connected to the connecting member (34); The electronic device further comprises a battery cover, the battery cover is used to close the battery receiving slot (101), the battery cover is provided with a magnetic member, and the magnetic member is used to be magnetically connected to the second contact point (35).

11. A vehicle, characterized in that: The vehicle comprises a vehicle body and a battery assembly according to any one of claims 1 to 7, wherein the vehicle body is provided with a battery receiving groove (101), and the battery assembly is received in the battery receiving groove (101).

12. The vehicle according to claim 11, characterized in that The expansion member (31) is thermally connected to the vehicle body.

13. The vehicle according to claim 11, characterized in that The temperature rise monitoring device (3) further comprises a connecting member (34), wherein the connecting member (34) connects the movable member (32) and the first contact (33) so that the movable member (32) and the first contact (33) move synchronously; The temperature rise monitoring device (3) further comprises a second contact (35), wherein the second contact (35) is connected to the connecting member (34); The vehicle further comprises a battery cover, the battery cover being used to close the battery receiving slot (101), the battery cover being provided with a magnetic member, the magnetic member being used to be magnetically connected to the second contact point (35).

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