Battery cell, battery pack and electrical device

Abstract

A battery cell, a battery pack, and an electrical device. The battery cell comprises: a housing; an electrode core; and a temperature-sensitive deformable member; the housing defines an accommodating cavity, the electrode core is accommodated in the accommodating cavity, the temperature sensitive deformable member is accommodated in the accommodating cavity and is connected to the electrode core, and, as a temperature of the electrode core increases, at least part of the temperature sensitive deformable member expands so as to approach the housing, and / or at least part of the temperature sensitive deformable member contracts so as to withdraw from the housing.

Description

Battery cells, battery packs and electrical equipment

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to the Chinese patent application filed with the China Patent Office on October 30, 2023, with application number 202322933156.2 and invention name “Battery Cell, Battery Pack and Electrical Equipment”, the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The present application relates to the field of battery technology, and in particular to a battery cell, a battery pack, and an electrical device. Background Art

[0004] In existing battery cells, the core is provided with a PET plate near the outer shell, which plays a role in structural fixation. Since the physical properties of the PET plate are uniform, the thermal conductivity of the battery cell is consistent under different temperature conditions. In the event of overall overheating or local overheating, thermal balance cannot be achieved. Especially under high current or high power conditions, due to the structural characteristics of a single battery cell: the current path is positive electrode tab-positive electrode collector-positive electrode sheet-diaphragm-negative electrode sheet-negative electrode collector-negative electrode tab, resulting in uneven current density distribution and uneven heat generation in the core; the internal structural components of the positive and negative electrodes have small thermal capacity, so the temperature rise is obvious under high current or high power. The above structural characteristics of a single battery cell result in uneven temperature and large temperature differences at different positions in the battery cell, which will affect the safety, performance, and life of the entire battery cell.

[0005] Summary of the Invention

[0006] The purpose of this application is to provide a battery cell, a battery pack, and an electrical device to solve the problem of uneven temperature inside the battery cell.

[0007] To achieve the purpose of this application, this application provides the following technical solutions:

[0008] In a first aspect, the present application provides a battery cell comprising a shell, a pole core, and a temperature-sensitive deformation member; wherein the shell encloses a receiving cavity; the pole core is received in the receiving cavity; the temperature-sensitive deformation member is received in the receiving cavity and connected to the pole core; as the temperature of the pole core rises, at least part of the temperature-sensitive deformation member expands to approach the shell, and / or at least part of the temperature-sensitive deformation member contracts to move away from the shell.

[0009] In one embodiment, the temperature-sensitive deformation member includes an expansion section, which is connected to a side surface of the pole core and extends along the length direction of the battery core. The expansion section expands as the temperature rises.

[0010] In one embodiment, the temperature-sensitive deformation member includes a contraction section, which is connected to a side surface of the pole core and extends along the length direction of the battery core. The contraction section contracts as the temperature rises.

[0011] In one embodiment, the temperature-sensitive deformation part includes an expansion section and a contraction section, and the expansion section and the contraction section are connected in sequence along the length direction of the battery core; the pole core includes a high-temperature part and a low-temperature part, and after the temperature of the pole core rises, the temperature of the high-temperature part is greater than the temperature of the low-temperature part; the expansion section is connected to the side of the high-temperature part, and the contraction section is connected to the side of the low-temperature part, the expansion section expands as the temperature rises, and the contraction section contracts as the temperature rises.

[0012] In one embodiment, the material of the expansion portion of the temperature-sensitive deformation member is one of graphite, nylon PA66, and silicon nitride.

[0013] In one embodiment, the material of the contraction portion of the temperature-sensitive deformation member is one of zirconium tungstate, aramid, carbon fiber, and electrostrictive ceramics.

[0014] In one embodiment, there are multiple temperature-sensitive deformation components, and along the width direction of the battery core, at least one temperature-sensitive deformation component is provided on each of the two opposite side surfaces of the pole core.

[0015] In one embodiment, there is a gap between the temperature-sensitive deformation member and the housing to allow the temperature-sensitive deformation member to expand.

[0016] In a second aspect, the present application further provides a battery pack comprising a shell and a plurality of battery cells according to any one of the various embodiments of the first aspect, wherein the battery cells are accommodated in the shell, and the plurality of battery cells are arranged in an array.

[0017] In one embodiment, the battery pack includes a low-temperature zone and a high-temperature zone, and at least one battery cell is provided in each of the low-temperature zone and the high-temperature zone, wherein the temperature of the battery cell in the low-temperature zone is less than or equal to the temperature of the battery cell in the high-temperature zone; the low-temperature zone includes a first battery cell, and the first battery cell includes the temperature-sensitive deformation part with contraction deformation; the high-temperature zone includes a second battery cell, and the second battery cell includes the temperature-sensitive deformation part with expansion deformation.

[0018] In a third aspect, the present application further provides an electrical device, comprising an electrical device and the battery pack described in the second aspect, wherein the battery pack is used to supply power to the electrical device.

[0019] By setting a temperature-sensitive deformation part in the battery cell that deforms as the core temperature rises, the temperature-sensitive deformation part can expand or contract after the core temperature rises; the expanded part of the temperature-sensitive deformation part can be close to the shell, and the heat is dissipated through the shell, thereby improving the heat transfer capacity, and the contracted part of the temperature-sensitive deformation part can be away from the shell, reducing the heat transfer capacity; in this way, the heat transfer capacity in the direction of the battery cell shell (cooling surface) can be autonomously enhanced or weakened in real time, so that the high-temperature part and the low-temperature part in the battery cell can achieve a uniform temperature effect through the temperature-sensitive deformation part, which is beneficial to improving the safety, performance, and service life of the battery cell under high current or high power conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the implementation methods of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the implementation methods or the description of the prior art. Obviously, the drawings described below are only some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] FIG1 is an exploded structural diagram of a battery cell in one embodiment;

[0022] FIG2 is an exploded structural diagram of a battery cell according to another embodiment;

[0023] FIG3 is an exploded structural diagram of a battery cell according to another embodiment;

[0024] FIG4 is a structural diagram of the appearance of a battery pack according to an embodiment;

[0025] FIG. 5 is a top view of a battery pack according to one embodiment.

[0026] Description of reference numerals:

[0027] 10-battery core, 11-housing, 12-pole core, 121-high temperature part, 122-low temperature part, 13-temperature-sensitive deformation part, 131-expansion section, 132-contraction section;

[0028] 100-battery pack, 101-low temperature zone, 102-high temperature zone, 10A-first battery cell, 10B-second battery cell, 20-housing;

[0029] X-length direction, Y-width direction, Z-thickness direction. DETAILED DESCRIPTION

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

[0031] It should be noted that when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may be an intermediate component. When a component is referred to as being "connected to" another component, it may be directly connected to the other component or there may be an intermediate component.

[0032] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by those skilled in the art to which this application belongs. The terms used in this specification are for the purpose of describing specific embodiments only and are not intended to limit this application. The term "and / or" as used in this application includes any and all combinations of one or more of the relevant listed items.

[0033] The following describes some embodiments of the present application in detail with reference to the accompanying drawings. In the absence of conflict, the following embodiments and features therein may be combined with each other.

[0034] The present application provides a battery cell 10, please refer to Figures 1 to 3, including a shell 11, a pole core 12, and a temperature-sensitive deformation member 13; wherein, the shell 11 encloses a receiving cavity; the pole core 12 is received in the receiving cavity; the temperature-sensitive deformation member 13 is received in the receiving cavity and connected to the pole core 12; as the temperature of the pole core 12 increases, at least part of the temperature-sensitive deformation member 13 expands to approach the shell 11, and / or at least part of the temperature-sensitive deformation member 13 contracts to move away from the shell 11.

[0035] Specifically, the battery cell 10 provided in the present application may be a hexahedral battery cell 10 or a cylindrical battery cell 10 .

[0036] Optionally, the housing 11 may be an aluminum housing and enclose a receiving cavity for receiving the pole core 12 and the temperature-sensitive deformation member 13. The shape of the housing 11 is the appearance shape of the battery cell 10; for example, the housing 11 is a hexahedron or a cylinder.

[0037] Optionally, the core 12 is the main power generation device in the battery cell 10, and may include a positive electrode sheet, a negative electrode sheet, and a separator. The type of the positive electrode sheet is not limited, and may be a lithium ion positive electrode sheet, a sodium ion positive electrode sheet, etc.

[0038] Optionally, the temperature-sensitive deformation member 13 may be a flat plate structure and connected to the side of the pole core 12. The temperature-sensitive deformation member 13 may deform as the temperature of the pole core 12 increases. Furthermore, the deformation may be expansion deformation or contraction deformation.

[0039] It can be understood that the deformation characteristics of the temperature-sensitive deformable part 13 mainly come from the material it is made of. When it is made of a material with thermal expansion characteristics, the temperature-sensitive deformable part 13 can exhibit expansion characteristics; when it is made of a material with thermal contraction characteristics, the temperature-sensitive deformable part 13 can exhibit contraction characteristics.

[0040] Optionally, the temperature-sensitive deformation member 13 may have only expansion characteristics, that is, the temperature-sensitive deformation member 13 is made of only thermal expansion material; or, the temperature-sensitive deformation member 13 may have only contraction characteristics, that is, the temperature-sensitive deformation member 13 is made of only thermal contraction material.

[0041] Optionally, the temperature-sensitive deformable member 13 may also have expansion characteristics and contraction characteristics at the same time, that is, the temperature-sensitive deformable member 13 uses expansion materials and contraction materials at the same time, and different parts of the temperature-sensitive deformable member 13 exhibit different deformations.

[0042] Furthermore, the temperature-sensitive deformation member 13 is disposed between the pole core 12 and the shell 11 , so that after the temperature-sensitive deformation member 13 expands, it is closer to the shell 11 than before the expansion, and after the temperature-sensitive deformation member 13 contracts, it is farther away from the shell 11 than before the contraction.

[0043] As can be understood, after expansion, the temperature-sensitive deformation member 13 is close to the housing 11 (cooling surface), so that the heat generated in the pole core 12 can be quickly conducted to the housing 11 through the temperature-sensitive deformation member 13, and then transferred to the outside through the housing 11, thereby achieving heat dissipation. After contraction, the temperature-sensitive deformation member 13 is away from the housing 11, so that the heat generated in the pole core 12 is retained in the pole core 12, thereby achieving heat preservation.

[0044] It should be explained that there may be a gap between the temperature-sensitive deformation member 13 and the housing 11 , and the gap may be used to allow the temperature-sensitive deformation member 13 to expand.

[0045] By providing a temperature-sensitive deformable part 13 in the battery cell 10 that deforms as the temperature of the pole core 12 increases, the temperature-sensitive deformable part 13 can expand or contract after the temperature of the pole core 12 increases; the expanded part of the temperature-sensitive deformable part 13 can be close to the outer shell 11, and dissipate heat through the outer shell 11, thereby improving the heat transfer capacity, and the contracted part of the temperature-sensitive deformable part 13 can be away from the outer shell 11, thereby reducing the heat transfer capacity; in this way, the heat transfer capacity of the battery cell 10 in the direction of the outer shell 11 (cooling surface) can be autonomously enhanced or weakened in real time, so that the high-temperature part 121 and the low-temperature part 122 in the battery cell 10 can achieve a uniform temperature effect through the temperature-sensitive deformable part 13, which is beneficial to improving the safety, performance, and service life of the battery cell 10 under high current or high power conditions.

[0046] In one embodiment, the battery cell 10 may further include a PET side plate, and the temperature-sensitive deformation member 13 is composited on the PET side plate.

[0047] In one embodiment, the battery cell 10 does not include a PET side panel, and the temperature-sensitive deformation member 13 is used to assume the support and protection functions of the original PET side panel.

[0048] In one embodiment, referring to FIG. 2 , the temperature-sensitive deformable member 13 includes an expansion section 131 . The expansion section 131 is connected to the side of the pole core 12 and extends along the length direction X of the battery core 10 . The expansion section 131 expands as the temperature rises.

[0049] Specifically, the battery cell 10 may be a hexahedral battery cell 10 (blade battery cell 10), including a length direction X, a width direction Y, and a thickness direction Z. The pole core 12 includes a first side surface intersecting with the width direction Y, and the temperature-sensitive deformation member 13 is connected to the first side surface.

[0050] Optionally, the temperature-sensitive deformation member 13 only includes the expansion section 131 , that is, the temperature-sensitive deformation member 13 is made of a thermal expansion material. The expansion section 131 extends along the length direction X of the battery cell 10 , thereby forming a rectangular flat-plate structure.

[0051] Optionally, the expansion section 131 expands as the temperature of the pole core 12 increases, thereby transferring heat to the shell 11 .

[0052] In one embodiment, referring to FIG3 , the temperature-sensitive deformable member 13 includes a contraction section 132 . The contraction section 132 is connected to the side of the pole core 12 and extends along the length direction X of the battery core 10 . The contraction section 132 contracts as the temperature rises.

[0053] Specifically, the temperature-sensitive deformable member 13 only includes a contraction section 132 , that is, the temperature-sensitive deformable member 13 is made of heat-shrinkable material. The contraction section 132 extends along the length direction X of the battery cell 10 , thereby forming a rectangular flat-plate structure.

[0054] Optionally, the contraction section 132 expands as the temperature of the pole core 12 increases, thereby keeping the heat in the battery core 10 .

[0055] In one embodiment, please refer to Figure 1, the temperature-sensitive deformation part 13 includes an expansion section 131 and a contraction section 132, and the expansion section 131 and the contraction section 132 are connected in sequence along the length direction X of the battery cell 10; the pole core 12 includes a high-temperature portion 121 and a low-temperature portion 122. After the temperature of the pole core 12 rises, the temperature of the high-temperature portion 121 is greater than the temperature of the low-temperature portion 122; the expansion section 131 is connected to the side of the high-temperature portion 121, and the contraction section 132 is connected to the side of the low-temperature portion 122. The expansion section 131 expands as the temperature rises, and the contraction section 132 contracts as the temperature rises.

[0056] Specifically, during the use of the battery cell 10, different parts of the core 12 generate different amounts of heat, resulting in different temperatures across the core 12. Therefore, the core 12 can be divided into a high-temperature portion 121 and a low-temperature portion 122. The high-temperature portion 121 has a higher temperature than the low-temperature portion 122. Specifically, the high-temperature portion 121 generates more heat, resulting in a faster temperature rise, while the low-temperature portion 122 generates less heat, resulting in a slower temperature rise. This results in an uneven temperature distribution across the core 12.

[0057] Optionally, taking the hexahedral battery cell 10 (blade battery cell 10) as an example, the pole core 12 has a high-temperature portion 121 at both ends in the length direction X and a low-temperature portion 122 in the middle, as shown in Figure 1. Because the pole ears are located at both ends of the pole core 12, which are the main interfaces for charging and discharging, they generate a lot of heat and thus have a higher temperature.

[0058] Furthermore, the expansion section 131 is located in the high-temperature portion 121, and the contraction section 132 is located in the low-temperature portion 122. As shown in Figure 1, the temperature-sensitive deformation member 13 can have a three-section structure, with an expansion section 131, a contraction section 132, and another expansion section 131 arranged in sequence along the length direction X. Furthermore, in the width direction Y of the battery cell 10, the projections of the expansion section 131 and the high-temperature portion 121 overlap, while the projections of the contraction section 132 and the low-temperature portion 122 overlap.

[0059] Optionally, the length of the expansion section 131 (the dimension of the battery cell 10 in the length direction X) can be less than or equal to the length of the contraction section 132. It is understood that the lengths of the expansion section 131 and the contraction section 132 are not specifically limited and can be designed based on the specific heat generation and operating conditions of the battery cell 10.

[0060] Optionally, the expansion section 131 and the contraction section 132 may be an integrated structure. Alternatively, the expansion section 131 and the contraction section 132 may be a separate structure.

[0061] By providing a temperature-sensitive deformation member 13 having an expansion section 131 and a contraction section 132 in the battery cell 10 , the temperature-sensitive deformation member 13 can produce different deformation effects according to different temperature positions of the pole core 12 , thereby achieving a uniform temperature effect for the battery cell 10 .

[0062] In one embodiment, the material of the expansion portion of the temperature-sensitive deformation member 13 is one of graphite, nylon PA66, silicon nitride, and Ni-Ti-Cu two-way memory alloy (50.1% wt Ni, 44.9% wt Ti, 5% wt Cu).

[0063] In one embodiment, the material of the contraction portion of the temperature-sensitive deformation member 13 is one of zirconium tungstate, aramid, carbon fiber, thermostrictive ceramics, and Ni-Ti-Cu two-way memory alloy (50.1% wt Ni, 44.9% wt Ti, 5% wt Cu).

[0064] In one embodiment, there are multiple temperature-sensitive deformation members 13, and at least one temperature-sensitive deformation member 13 is provided on each of the two opposite sides of the pole core 12 along the width direction Y of the battery cell 10. Specifically, there can be two temperature-sensitive deformation members 13, one of which is provided on each of the two opposite sides of the pole core 12.

[0065] In one embodiment, please refer to Figures 4 and 5. The present application also provides a battery pack 100, including a shell 20 and multiple battery cells 10 provided in the above embodiments. The battery cells 10 are accommodated in the shell 20, and the multiple battery cells 10 are arranged in an array.

[0066] In one embodiment, please refer to Figures 4 and 5, the battery pack 100 includes a low-temperature zone 101 and a high-temperature zone 102, and at least one battery cell 10 is provided in the low-temperature zone 101 and the high-temperature zone, wherein the temperature of the battery cell 10 in the low-temperature zone 101 is less than or equal to the temperature of the battery cell 10 in the high-temperature zone 102; the low-temperature zone 101 includes a first battery cell 10A, and the first battery cell 10A includes a temperature-sensitive deformation part 13 with contraction deformation; the high-temperature zone 102 includes a second battery cell 10B, and the second battery cell 10B includes a temperature-sensitive deformation part 13 with expansion deformation.

[0067] Specifically, during use, the battery pack 100 generates different amounts of heat from cells 10 in different locations within the pack, resulting in varying temperatures across the entire pack 100. Therefore, the battery pack 100 can be divided into a high-temperature zone 102 and a low-temperature zone 101. The high-temperature zone 102 has a higher temperature than the low-temperature zone 101. Specifically, the high-temperature zone 102 generates more heat, resulting in a faster temperature rise, while the low-temperature zone 101 generates less heat, resulting in a slower temperature rise. This results in an uneven temperature distribution across the entire battery pack 100.

[0068] Optionally, as shown in FIG4 , the low-temperature zone 101 includes a plurality of first battery cells 10A, and the high-temperature zone 102 includes a plurality of second battery cells 10B. To ensure that the temperature difference between the first battery cells 10A in the high-temperature zone 102 and the second battery cells 10B in the high-temperature zone 102 is reduced, a temperature-sensitive deformation member 13 (heat-shrinkage material) that contracts and deforms is provided in the first battery cell 10A, and a temperature-sensitive deformation member 13 (heat-expansion material) that expands and deforms is provided in the second battery cell 10A.

[0069] As can be understood, due to the temperature distribution differences within the battery pack 100, the low-temperature region 101 includes the first battery cell 10A with the lowest temperature. This means that the temperature of this battery cell 10 is lower than the second battery cell 10B with the lowest temperature in the high-temperature region 102, and lower than the first battery cell 10A with the highest temperature in the low-temperature region 101. Therefore, in the first battery cell 10A with the lowest temperature, the temperature-sensitive deformable member 13 can be completely in the contracted section 132, thereby slowing down heat release.

[0070] The high-temperature zone 102 includes the second battery cell 10B, which has the highest temperature. Specifically, the temperature of this battery cell 10 is higher than the first battery cell 10A, which has the highest temperature, in the low-temperature zone 101, and higher than the second battery cell 10B, which has the lowest temperature, in the high-temperature zone 102. Therefore, in the second battery cell 10B, which has the lowest temperature, the temperature-sensitive deformation member 13 can be completely in the expansion section 131, accelerating heat release.

[0071] In the battery cells 10 in the low temperature zone 101 and the high temperature zone 102 , the temperature-sensitive deformation member 13 in the battery cell 10 may also include an expansion section 131 and a contraction section 132 , and the structures of the expansion section 131 and the contraction section 132 are as described in the above embodiment and will not be repeated here.

[0072] Therefore, the same battery pack 100 includes the following three types of temperature-sensitive deformation members 13: a temperature-sensitive deformation member 13A consisting of only a contraction section 132, a temperature-sensitive deformation member 13B consisting of only an expansion section 131, and a temperature-sensitive deformation member 13C having both an expansion section 131 and a contraction section 132.

[0073] For example, as shown in Figure 5, the distribution of the temperature-sensitive deformation parts 13A, 13B, and 13C can be: along the direction of the arrow, the temperature-sensitive deformation parts 13A, 13B, and 13C are arranged in sequence; wherein, the direction indicated by the arrow is the direction of temperature increase in the battery pack 100 (the starting point of the arrow is the low temperature zone 101, and the end point is the high temperature zone 102).

[0074] Optionally, the expansion segments 131 and contraction segments 132 of the temperature-sensitive deformation member 13C may have different lengths in different locations of the battery cells 10. Understandably, the closer the battery cell 10 is to the center of the high-temperature zone 102, the greater the heat generated, so more expansion segments 131 are needed to dissipate heat. The closer the battery cell 10 is to the center of the low-temperature zone 101, the less heat generated, so more contraction segments 132 are needed to maintain heat.

[0075] By arranging temperature-sensitive deformation parts 13 with different deformation effects in the high-temperature zone 102 and the low-temperature zone 101 of the battery pack 100, the battery cells 10 at different positions of the battery pack 100 can have different thermal management capabilities. By autonomously enhancing or weakening the heat transfer capability in the direction of the battery cell 10 shell 11 (cooling surface), the battery pack 100 can achieve a uniform temperature effect through the temperature-sensitive deformation parts 13 in the battery cell 10, which is beneficial to improving the safety, performance, and service life of the battery pack 100 under high current or high power conditions.

[0076] In one embodiment, the present application further provides an electrical device, including an electrical device and the battery pack 100 in the above embodiment or the battery cell 10 in the above embodiment, wherein the battery pack 100 or the battery cell 10 supplies power to the electrical device.

[0077] In the description of the embodiments of the present application, it should be noted that the orientation or positional relationship of terms such as "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", and "outside" are based on the orientation or positional relationship described in the accompanying drawings. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present application.

[0078] The above disclosure is only a preferred embodiment of the present application, and certainly cannot be used to limit the scope of rights of the present application. Ordinary technicians in this field can understand that all or part of the processes of the above embodiment and equivalent changes made in accordance with the claims of the present application are still within the scope covered by the present application.

Claims

1. A battery cell (10), characterized in that: include: A housing (11) enclosing the receiving cavity; A pole core (12) is received in the receiving cavity; as well as A temperature-sensitive deformation member (13) is accommodated in the accommodation cavity and connected to the pole core (12); as the temperature of the pole core (12) increases, at least part of the temperature-sensitive deformation member (13) expands to approach the shell (11), and / or at least part of the temperature-sensitive deformation member (13) contracts to move away from the shell (11).

2. The battery cell (10) according to claim 1, characterized in that: The temperature-sensitive deformation member (13) comprises an expansion section (131), wherein the expansion section (131) is connected to a side surface of the pole core (12) and extends along a length direction (X) of the battery core (10), and the expansion section (131) expands as the temperature rises.

3. The battery cell (10) according to claim 1, characterized in that: The temperature-sensitive deformation member (13) comprises a contraction section (132), wherein the contraction section (132) is connected to the side of the pole core (12) and extends along the length direction (X) of the battery core (10), and the contraction section (132) contracts as the temperature rises.

4. The battery cell (10) according to claim 1, characterized in that: The temperature-sensitive deformation member (13) comprises an expansion section (131) and a contraction section (132), wherein the expansion section (131) and the contraction section (132) are sequentially connected along a length direction (X) of the battery core (10); The pole core (12) comprises a high temperature portion (121) and a low temperature portion (122), and after the temperature of the pole core (12) increases, the temperature of the high temperature portion (121) is greater than the temperature of the low temperature portion (122); and The expansion section (131) is connected to the side of the high-temperature portion (121), and the contraction section (132) is connected to the side of the low-temperature portion (122); the expansion section (131) expands as the temperature increases, and the contraction section (132) contracts as the temperature increases.

5. The battery cell (10) according to any one of claims 1 to 4, characterized in that: The material of the expansion part of the temperature-sensitive deformation member (13) is one of graphite, nylon PA66 and silicon nitride.

6. The battery cell (10) according to any one of claims 1 to 5, characterized in that: The material of the contraction part of the temperature-sensitive deformation member (13) is one of zirconium tungstate, aramid, carbon fiber and electrostrictive ceramics.

7. The battery cell (10) according to any one of claims 1 to 6, characterized in that: The number of the temperature-sensitive deformation components (13) is plural, and along the width direction (Y) of the battery core (10), at least one temperature-sensitive deformation component (13) is provided on two opposite sides of the pole core (12).

8. The battery cell (10) according to any one of claims 1 to 7, characterized in that: There is a gap between the temperature-sensitive deformation member (13) and the housing (11) to allow the temperature-sensitive deformation member (13) to expand.

9. A battery pack (100), characterized in that: It comprises a shell (20) and a plurality of battery cells (10) according to any one of claims 1 to 8, wherein the battery cells (10) are accommodated in the shell (20), and the plurality of battery cells (10) are arranged in an array.

10. The battery pack (100) according to claim 9, characterized in that: The battery pack (100) comprises a low temperature zone (101) and a high temperature zone (102), wherein at least one battery cell (10) is disposed in each of the low temperature zone (101) and the high temperature zone (102), wherein the temperature of the battery cell in the low temperature zone (101) is less than or equal to the temperature of the battery cell in the high temperature zone (102); The low temperature zone (101) comprises a first battery core (10A), the first battery core (10A) comprises the temperature-sensitive deformation member (13) having a contraction deformation; and The high temperature zone (102) comprises a second battery core (10B), and the second battery core (10B) comprises the temperature-sensitive deformation member (13) having expansion deformation.

11. An electrical device, characterized in that: It comprises an electric device and a battery pack (100) as claimed in claim 9 or 10, wherein the battery pack (100) is used to supply power to the electric device.

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