Battery, battery pack and energy storage equipment

Abstract

The utility model provides a battery, a battery pack and energy storage equipment, and relates to the technical field of batteries. The battery comprises a battery shell, a cover body, a pole, a battery cell and a metal sheet, the battery shell and the cover body are encircled to form an accommodating cavity for accommodating the battery cell and the metal sheet, and the pole penetrates through the cover body. The metal sheet comprises a first fixing part, a connecting part and a second fixing part which are sequentially arranged in the first direction, and each of the first fixing part and the second fixing part comprises a matching end face fixedly connected with the connecting part. The first fixing part is electrically connected with the pole, and the second fixing part is electrically connected with the tab of the battery cell. And a memory metal sheet which is fixedly stacked with the first fixing part is arranged on one side of the first fixing part in the thickness direction of the cover body. Under the condition that the current transmitted in the metal sheet is larger than or equal to a threshold value, the connecting part is fused, the memory metal sheet is used for enabling the projection of the matching end face of the first fixing part in the first direction and the projection of the matching end face of the second fixing part in the first direction to be arranged at intervals, and arc discharge is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a battery, a battery pack and an energy storage device. BACKGROUND

[0002] In a battery, the pole post and the tab of the battery cell pass current through a metal sheet, and the battery is connected to an electrical circuit through the pole post. When the battery has an electrical fault, the metal sheet will melt and break to disconnect the transmission of current in the battery, so as to avoid the thermal runaway of the battery cell and burn out, thereby improving the use safety of the battery. However, in the prior art, the two parts of the metal sheet after melting will be re-welded together, which will cause the thermal runaway of the battery cell, and the use safety of the battery cannot be guaranteed. CONTENT OF THE UTILITY MODEL

[0003] The present application provides a battery, a battery pack and an energy storage device, which aims to solve the problem that the use safety of the battery cannot be guaranteed.

[0004] In a first aspect, an embodiment of the present application provides a battery. The battery comprises a battery shell, a cover, a pole post, a battery cell and a metal sheet. The battery shell and the cover form a receiving cavity, the pole post is arranged in the cover, and the battery cell and the metal sheet are received in the receiving cavity. The metal sheet comprises a first fixed part, a connecting part and a second fixed part arranged in sequence along a first direction. The first fixed part and the second fixed part each comprise a matching end face fixedly connected with the connecting part. The first fixed part is electrically connected with the pole post, the second fixed part is electrically connected with the tab of the battery cell, and the first direction is perpendicular to the thickness direction of the cover. The first fixed part is provided with a memory metal sheet on one side in the thickness direction of the cover, and the memory metal sheet is fixedly stacked with the first fixed part. In the case that the current transmitted in the metal sheet is greater than or equal to a threshold value, the connecting part is melted, and the memory metal sheet is used to make the projection of the matching end face of the first fixed part along the first direction and the projection of the matching end face of the second fixed part along the first direction are spaced apart.

[0005] The battery provided in the embodiments of the present application is characterized in that the tab of the battery cell is in flow connection with the pole through the metal sheet, the external current can be transmitted to the battery cell through the pole and stored in the battery cell, and the current output by the battery cell can be output to the outside through the pole. Since the first fixing part, the connecting part and the second fixing part are sequentially arranged along the first direction, the first fixing part is electrically connected with the pole, and the second fixing part is electrically connected with the tab of the battery cell, when an electrical fault (for example, short circuit or the power of the current transmitted in the battery is greater than the rated power) occurs in the battery, the current transmitted in the metal sheet is greater than or equal to the threshold value, the connecting part is heated and fused, and the first fixing part is spaced from the second fixing part, so that the circulation of the current in the battery is cut off, the battery cell is prevented from being overheated and burned out, and the use safety of the battery is improved. Compared with the prior art, in the embodiments of the present application, when the current transmitted in the metal sheet is greater than or equal to the threshold value, the memory metal sheet is heated and bent to drive the first fixing part to bend, so that the projection of the fitting end surface of the first fixing part along the first direction is spaced from the projection of the fitting end surface of the second fixing part along the first direction. Not only can the spaced first fixing part and the second fixing part be prevented from being re-fused together, but also the spaced first fixing part and the second fixing part can be prevented from being subjected to arc draw phenomenon, the reliability of the metal sheet in protecting the battery is greatly improved, the probability of thermal runaway of the battery cell is effectively reduced, and the use safety of the battery is improved. Moreover, the structure is simple, easy to design, low in processing cost and high in practicability. In addition, on the basis of improving the reliability of the metal sheet in protecting the battery, the bending degree required by the memory metal sheet can be confirmed, the design cost and processing difficulty of the memory metal sheet are reduced, and the processing cost of the battery is reduced.

[0006] In a possible implementation, the thickness of the connecting part is less than the thickness of the first fixing part and the thickness of the second fixing part.

[0007] In this way, the speed of the connecting part being fused is improved, the speed of the current in the battery being cut off is improved, the probability of the battery cell being overheated and damaged is reduced, and the use safety of the battery is improved.

[0008] In a possible implementation, the memory metal sheet is at least partially located at the end of the first fixing part close to the connecting part.

[0009] In this way, the bending of the memory metal sheet can exert greater stress on the first fixing part to drive the first fixing part to bend, the speed of the first fixing part being bent is improved, the degree of the first fixing part being bent is increased, the probability of the battery cell being overheated and damaged is reduced, and the use safety of the battery is improved.

[0010] In a possible implementation, the first fixing part includes a main body and a matching end part, the matching end part is fixedly connected between the connecting part and the main body, the main body is located on one side of the connecting part in the direction perpendicular to the first direction and the thickness direction of the cover body, and the matching end part is partially located on the side of the main body close to the connecting part, and the memory metal sheet is fixedly stacked with the matching end part.

[0011] Since the matching end part is fixedly connected between the connecting part and the main body, the memory metal sheet is fixedly stacked with the matching end part; when the connecting part is fused, the memory metal sheet can drive the matching end part to bend relative to the main body to improve the reliability of the metal sheet in protecting the battery. Such a design forms a stepped surface between the matching end part and the main body, which is beneficial to reducing the difficulty of bending the matching end part by the memory metal sheet, improving the bending speed of the matching end part, increasing the bending degree of the matching end part, reducing the probability of damage of the battery due to overheating, and improving the use safety of the battery.

[0012] In a possible implementation, the first fixing part is provided with an opening, the opening penetrates the first fixing part along the thickness direction of the cover body and is located on one side of the connecting part in the direction perpendicular to the first direction and the thickness direction of the cover body and faces the connecting part along the first direction, and the projection of the memory metal sheet along the thickness direction of the cover body overlaps the projection of the opening along the thickness direction of the cover body.

[0013] In this way, the opening can reduce the strength of the first fixing part, which is beneficial to reducing the difficulty of bending the first fixing part by the memory metal sheet, reducing the requirement for the bending stress of the memory metal sheet, and reducing the processing cost of the memory metal sheet.

[0014] In a possible implementation, the number of the connecting parts and the number of the second fixing parts are both plural, the first fixing part is fixedly connected with one connecting part and one second fixing part, and the plural second fixing parts are sequentially and spacedly arranged in the direction perpendicular to the first direction and the thickness direction of the cover body.

[0015] Since the first fixing part is fixedly stacked with the memory metal sheet, the first fixing part is fixedly connected with one connecting part and one second fixing part, and the plural second fixing parts are sequentially and spacedly arranged in the direction perpendicular to the first direction and the thickness direction of the cover body; the bending of the first fixing part by the memory metal sheet can avoid the re-fusion of the first fixing part and the plural second fixing parts and the occurrence of the arc phenomenon between the first fixing part and the plural second fixing parts, which is beneficial to improving the utilization rate of the memory metal sheet and reducing the processing cost of the battery.

[0016] In a possible implementation, the memory metal sheet bends away from the cover body when the current transmitted in the metal sheet is greater than or equal to a threshold value.

[0017] In this way, space is reserved for the bending between the cover and the metal sheet is avoided, which helps to reduce the space between the cover and the metal sheet, improve the space utilization, and compact the structure of the battery.

[0018] In a possible implementation, the memory metal sheet is arranged on the side of the first fixed part away from the cover.

[0019] In this way, the memory metal sheet occupies the area of the first fixed part and the pole, which helps to reduce the area of the first fixed part, improve the space utilization, and compact the structure of the battery.

[0020] In a possible implementation, the memory metal sheet is made of one-way shape memory alloy.

[0021] The one-way shape memory alloy has the characteristics of deforming at high temperature and not easily deforming after cooling. In this way, when the memory metal sheet drives the first fixed part to bend, the characteristics of the one-way memory shape alloy are used to ensure that the bending degree of the first fixed part almost does not change during the cooling of the memory metal sheet, the spaced first fixed part and the second fixed part are always not re-fused together, and the arc phenomenon is always not generated, which helps to improve the reliability of the metal sheet in protecting the battery.

[0022] In a possible implementation, the bending temperature of the memory metal sheet is less than or equal to the melting temperature of the connecting part.

[0023] In this way, it is ensured that the memory metal sheet can immediately drive the first fixed part to bend when the connecting part is melted, which helps to reduce the probability of damage caused by overheat of the battery cell, and improve the use safety of the battery.

[0024] In a possible implementation, the bending stress of the memory metal sheet is greater than the yield stress of the first fixed part.

[0025] In this way, it is ensured that the memory metal sheet can drive the first fixed part to bend quickly, which helps to reduce the probability of damage caused by overheat of the battery cell, and improve the use safety of the battery.

[0026] In a second aspect, the embodiments of the present application further provide a battery. The battery comprises a battery shell, a cover, a pole, a battery cell and a metal sheet. The battery shell and the cover jointly form a receiving cavity. The pole is arranged in the cover. The battery cell and the metal sheet are received in the receiving cavity. The metal sheet comprises a first fixed part, a connecting part and a second fixed part arranged in sequence along a first direction. The first fixed part is electrically connected with the pole. The second fixed part is electrically connected with a tab of the battery cell. The first direction is perpendicular to a thickness direction of the cover. The first fixed part is provided with a memory metal sheet on one side in the thickness direction of the cover. The memory metal sheet is fixedly stacked with the first fixed part. In a case where a current transmitted in the metal sheet is greater than or equal to a threshold value, the connecting part is fused, and the memory metal sheet is used to make the interval between the first fixed part and the second fixed part along the first direction greater than the size of the connecting part along the first direction.

[0027] In the battery provided by the embodiments of the present application, the tab of the battery cell passes current with the pole through the metal sheet. External current can be transmitted to the battery cell through the pole and stored in the battery cell. The current output by the battery cell can be output to the outside through the pole. Since the first fixed part, the connecting part and the second fixed part are arranged in sequence along the first direction, the first fixed part is electrically connected with the pole, and the second fixed part is electrically connected with the tab of the battery cell, when an electrical fault (for example, short circuit or the power of the current transmitted in the battery is greater than the rated power) occurs in the battery, the current transmitted in the metal sheet is greater than or equal to the threshold value, the connecting part is fused by heat, and the first fixed part is spaced apart from the second fixed part. In this way, the circulation of the current in the battery can be cut off, so as to avoid the battery cell from being burned due to overheating, and the use safety of the battery can be improved. Compared with the prior art, in the embodiments of the present application, when the current transmitted in the metal sheet is greater than or equal to the threshold value, the memory metal sheet is bent by heat and drives the first fixed part to bend, so that the interval between the first fixed part and the second fixed part along the first direction is greater than the size of the connecting part along the first direction. Not only can the spaced-apart first fixed part and the second fixed part be prevented from being re-fused together, but also the spaced-apart first fixed part and the second fixed part can be prevented from arc phenomenon, the reliability of the metal sheet for protecting the battery is greatly improved, the probability of thermal runaway of the battery cell is effectively reduced, and the use safety of the battery can be improved. Moreover, the structure is simple, easy to design, low in processing cost and high in practicability. In addition, in this way, the bending degree of the first fixed part can be controlled by controlling the bending degree of the memory metal sheet, and then the interval between the first fixed part and the second fixed part along the first direction can be controlled. On the basis of ensuring that the metal sheet has good reliability for protecting the battery, the bending degree of the first fixed part can be minimized, the space reserved for the bending of the first fixed part can be reduced, and the space utilization rate of the battery can be improved.

[0028] In a third aspect, the embodiments of the present application further provide a battery pack. The battery pack comprises a plurality of batteries as described in any one of the first aspect or the second aspect, and the plurality of batteries are electrically connected.

[0029] In a fourth aspect, the embodiments of the present application further provide a kind of energy storage equipment.The energy storage equipment includes housing and the battery pack of the third aspect, and the battery pack is housed in the housing. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the background art, the drawings needed to be used in the embodiments of the present application or the background art will be described below.

[0031] Figure 1 is a structural block diagram of a kind of energy storage equipment provided by the embodiments of the present application and grid and load cooperation;

[0032] Figure 2 is a three-dimensional structural schematic diagram of a kind of battery provided by the embodiments of the present application;

[0033] Figure 3 is Figure 2 the three-dimensional structural exploded schematic diagram of the battery shown in;

[0034] Figure 4 is Figure 2 the partial structure schematic diagram of the battery along A-A line section shown in;

[0035] Figure 5 is Figure 3 the three-dimensional structural schematic diagram of the first metal sheet of the battery in another angle shown in;

[0036] Figure 6 is Figure 3 the structural schematic diagram of the first metal sheet after fusing in another angle shown in;

[0037] Figure 7 is Figure 6 the structural schematic diagram of the first metal sheet in another angle shown in;

[0038] Figure 8 is the partial structure schematic diagram of another kind of battery provided by the embodiments of the present application;

[0039] Figure 9 is Figure 8 the three-dimensional structural schematic diagram of the first metal sheet of the battery shown in;

[0040] Figure 10 is Figure 9 the structural schematic diagram of the first metal sheet after fusing in another angle shown in. DETAILED DESCRIPTION

[0041] The embodiments of the present application provide a kind of battery, battery pack and energy storage equipment.The battery is applied to battery pack, and battery pack is applied to energy storage equipment.

[0042] The embodiments of the present application will be described below with reference to the accompanying drawings.

[0043] Please refer to Figure 1 , Figure 1 is a structural block diagram of a cooperation structure of an energy storage device 1000, a power grid 2000 and a load 3000 provided by the embodiments of the present application.

[0044] As shown in Figure 1 , the energy storage device 1000 is used to convert the alternating current output by the power grid 2000 into direct current and store the direct current. The energy storage device 1000 can also be used to supply power to the load 3000. The energy storage device 1000 comprises a receiving shell 1, a battery pack 2 and a power module 3. The battery pack 2 and the power module 3 are both received in the receiving shell 1. The power module 3 is used to convert the alternating current output by the power grid 2000 into direct current and store the direct current into the battery pack 2. The battery pack 2 can also output direct current to the load 3000 to supply power to the load 3000. The battery pack 2 comprises a plurality of batteries 100, and the plurality of batteries 100 are electrically connected. Specifically, the plurality of batteries 100 can be connected in series or in parallel. Each battery 100 can store the direct current delivered from the power module 3. Each battery 100 can output direct current to supply power to the load 3000. The battery 100 can be a winding type lithium ion battery cell, a laminated type lithium ion battery cell or other types of batteries 100.

[0045] In other embodiments, the direct current output by the battery pack 2 can also be converted into alternating current by a DC / AC module and then delivered to the load 3000 to supply power to the load 3000. In other embodiments, the power module 3 can also be omitted. For example, the direct current output by a photovoltaic assembly can be directly stored in the battery pack 2.

[0046] In a battery, the pole and the tab of the battery cell pass current through a metal sheet, and the battery is connected to an electrical circuit through the pole. When an electrical fault occurs in the battery (for example, a short circuit or the power of the current transmitted in the battery is greater than the rated power of the battery), the metal sheet will melt and break the transmission of the current in the battery, so as to avoid the battery cell from thermal runaway and burning, thereby improving the use safety of the battery. However, in the prior art, the two parts of the metal sheet after melting will be re-welded together, which will still cause the battery cell to thermal runaway, and the use safety of the battery cannot be guaranteed.

[0047] In view of the above problems, the embodiments of the present application provide a battery, which changes the cooperation relationship between the two parts of the metal sheet after melting, avoids the two parts of the metal sheet after melting from being re-welded together, thereby reducing the probability of thermal runaway of the battery cell and improving the use safety of the battery.

[0048] Please refer toFigure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 and combined Figure 1 , Figure 2 This is a three-dimensional structural diagram of a battery 100 provided in an embodiment of this application. Figure 3 yes Figure 2 An exploded view of the three-dimensional structure of the battery 100 shown. Figure 4 yes Figure 2 The diagram shows a partial structural diagram of the battery 100 cut along line AA. Figure 5 yes Figure 3 A three-dimensional structural diagram of the first metal sheet 50a of the battery 100 shown from another angle. Figure 6 yes Figure 3 The diagram shows the structure of the first metal sheet 50a after it has melted and broken at another angle. Figure 7 yes Figure 6 The diagram shows the structure of the first metal sheet 50a at another angle.

[0049] like Figure 2 , Figure 3 and Figure 4 As shown, the battery 100 includes a battery casing 10, a cover 20, terminals 30, a battery cell 40, and a metal sheet 50. For ease of description, this application defines any three mutually perpendicular directions as a first direction, a second direction, and a third direction, where the first direction (i.e., the X-axis direction shown in the figure), the second direction (i.e., the Y-axis direction shown in the figure), and the third direction (i.e., the Z-axis direction shown in the figure) are mutually perpendicular. Specifically, the first direction (i.e., the X-axis direction shown in the figure) and the second direction (i.e., the Y-axis direction shown in the figure) are both perpendicular to the thickness direction of the cover 20, and the third direction (i.e., the Z-axis direction shown in the figure) is parallel to the thickness direction of the cover 20. In this embodiment, the first direction (i.e., the X-axis direction shown in the figure) is the length direction of the cover 20, and the second direction (i.e., the Y-axis direction shown in the figure) is the width direction of the cover 20. In other embodiments, the first direction (i.e., the X-axis direction shown in the figure) may also be the width direction of the cover 20, and the second direction (i.e., the Y-axis direction shown in the figure) may also be the length direction of the cover 20.

[0050] The battery housing 10 and the cover 20 together form a receiving cavity 60. Specifically, the receiving cavity 60 is disposed on the battery housing 10 and extends along the Z-axis direction and has a receiving opening 61. In the Z-axis direction, the cover 20 is disposed on one side of the battery housing 10 by means including but not limited to welding, pressing or fastening, and covers the receiving opening 61 of the receiving cavity 60 and closes the receiving cavity 60.

[0051] The pole column 30 penetrates the cover 20. Specifically, the pole column 30 partially penetrates the cover 20 and partially penetrates the accommodation cavity 60, and partially accommodates in the accommodation cavity 60. The cover 20 is provided with a mounting hole 21 penetrating the cover 20 along the Z-axis direction and communicating with the accommodation cavity 60. The pole column 30 includes a first part 31 and a second part 32, and the first part 31 is arranged on one side of the second part 32 along the Z-axis direction. The first part 31 penetrates the mounting hole 21 and protrudes outside the accommodation cavity 60, and the second part 32 is accommodated in the accommodation cavity 60 and in contact or abutment with the cover 20. In this way, the structural stability of the pole column 30 and the cover 20 is improved, and the structural stability and reliability of the battery 100 are improved. In other embodiments, the second part 32 can also be spaced apart from the cover 20.

[0052] The battery cell 40 and the metal sheet 50 are accommodated in the accommodation cavity 60. The battery cell 40 is used to store or output direct current. The battery cell 40 includes a battery cell body 41 and an insulating piece 42. The battery cell body 41 is provided with a tab 411. Specifically, the tab 411 is arranged on the side of the battery cell body 41 facing the cover 20 along the Z-axis direction. The tab 411 is arranged on one side of the pole column 30 along the X-axis direction and is spaced apart from the pole column 30. The tab 411 of the battery cell 40 and the pole column 30 are in flow through connection through the metal sheet 50. Specifically, the metal sheet 50 is arranged between the tab 411 and the pole column 30 along the Z-axis direction, and the metal sheet 50 is in electrical connection with the tab 411 and the pole column 30. The battery cell body 41 is arranged in insulation with the battery shell 10 through the insulating piece 42. Specifically, the insulating piece 42 has an inner cavity 421, and the inner cavity 421 of the insulating piece 42 has an opening along the Z-axis direction, and the opening of the inner cavity 421 of the insulating piece 42 faces the cover 20. The battery cell body 41 is accommodated in the inner cavity 421 of the insulating piece 42, and the tab 411 protrudes outside the insulating piece 42 from the opening of the inner cavity 421 of the insulating piece 42. Specifically, the number of battery cell bodies 41 is multiple, specifically two, and the two battery cell bodies 41 are arranged along the Y-axis direction. In other embodiments, the number of battery cell bodies 41 can also be one, three or more.

[0053] The battery cell body 41 is connected to the electrical circuit through the pole column 30. Specifically, the pole column 30 includes a positive pole column 30a and a negative pole column 30b. The positive pole column 30a and the negative pole column 30b are spaced apart along the X-axis direction. The tab 411 includes a positive tab 411a and a negative tab 411b. The positive tab 411a and the negative tab 411b can be located between the positive pole column 30a and the negative pole column 30b along the X-axis direction. The number of metal sheets 50 is multiple, and the multiple metal sheets 50 include a first metal sheet 50a and a second metal sheet 50b. The positive tab 411a is in flow through connection with the positive pole column 30a through the first metal sheet 50a, and the negative tab 411b is in flow through connection with the negative pole column 30b through the second metal sheet 50b. Specifically, the positive pole column 30a can be in electrical connection with the power module 3 (such as the power module 3 shown in FIG. 1) through the positive tab 411a, and the negative pole column 30b can be in electrical connection with the power module 3 through the negative tab 411b. Figure 1The positive electrode output end of the power module 3 is connected with the positive electrode column 30a, and the negative electrode output end of the power module 3 is connected with the negative electrode column 30b. Thus, the positive electrode column 30a can be connected with the positive electrode of the load 3000, and the negative electrode column 30b can be connected with the negative electrode of the load 3000. Thus, the battery cell body 41 (i.e., the battery cell 40) can store or output direct current through the electrode column 30. In some other embodiments, the positive electrode column 30a can also be connected with the negative electrode of the load 3000, and the negative electrode column 30b can be connected with the negative electrode output end of the power module 3. In some other embodiments, the positive electrode column 30a and the negative electrode column 30b can also be located between the positive electrode tab 411a and the negative electrode tab 411b in the X-axis direction.

[0054] As shown in Figure 3 , Figure 4 and Figure 5 , the metal sheet 50 includes a first fixed portion 51, a connecting portion 52, and a second fixed portion 53 arranged in sequence in the X-axis direction (i.e., the first direction). Specifically, the connecting portion 52 is in contact with and fixedly connected with the first fixed portion 51 and the second fixed portion 53. For example, the first fixed portion 51, the connecting portion 52, and the second fixed portion 53 are integrally formed, which is conducive to improving the overall strength and structural stability of the metal sheet 50. In some other embodiments, the first fixed portion 51 and the second fixed portion 53 can also be fixedly connected by welding or gluing. The first fixed portion 51 is electrically connected with the electrode column 30, and the second fixed portion 53 is electrically connected with the electrode tab 411 of the battery cell 40. Specifically, in the Z-axis direction, the first fixed portion 51 is fixedly laminated on the side of the electrode column 30 facing the battery cell 40, and the second fixed portion 53 is fixedly connected on the side of the electrode tab 411 facing the cover 20. In some other embodiments, the first fixed portion 51 can also be in contact with the electrode column 30, and the second fixed portion 53 can also be in contact with the electrode tab 411.

[0055] In the first metal sheet 50a (i.e., the metal sheet 50), the first fixed portion 51a and the second fixed portion 53a each include a mating end face 54 fixedly connected with the connecting portion 52a. The first fixed portion 51a is provided with a memory metal sheet 70 on one side in the Z-axis direction (i.e., the thickness direction of the cover 20), and the memory metal sheet 70 is fixedly laminated with the first fixed portion 51a. Specifically, the memory metal sheet 70 is fixedly laminated with the first fixed portion 51a by means including but not limited to fasteners (such as rivets), gluing, or crimping. The thickness of the connecting portion 52a is less than the thickness of the first fixed portion 51a and the thickness of the second fixed portion 53a.

[0056] As shown in Figure 5 , Figure 6 and Figure 7As shown, when the current transmitted in the first metal sheet 50a (i.e., metal sheet 50) is greater than or equal to the threshold, the connecting part 52a melts, the first fixing part 51a and the second fixing part 53a are spaced apart, the first fixing part 51a bends along the first bending direction W1 with the memory metal sheet 70, and the memory metal sheet 70 is used to make the projection of the mating end face 54a of the first fixing part 51a along the X-axis direction (i.e., the first direction) and the projection of the mating end face 54b of the second fixing part 53a along the X-axis direction (i.e., the first direction) spaced apart.

[0057] like Figure 3 , Figure 5 and Figure 7 As shown, in Figure 3 , Figure 5 and Figure 7 In the illustrated embodiment, the structure of the second metal sheet 50b is similar to that of the first metal sheet 50a. The difference lies in that the thickness of the connecting portion 52b in the second metal sheet 50b is equal to the thickness of the first fixing portion 51b and the thickness of the second fixing portion 53b. Neither the first fixing portion 51b nor the second fixing portion 53b includes a mating end face 54, and the first fixing portion 51b does not have a shape memory metal sheet 70. When the current transmitted in the second metal sheet 50b is greater than or equal to a threshold value, the connecting portion 52b will not melt. In other embodiments, the structure of the second metal sheet 50b may be the same as that of the first metal sheet 50a; for details, please refer to the relevant description of the first metal sheet 50a, which will not be repeated here.

[0058] In the battery 100 provided by the embodiment, the tab 411 of the battery cell 40 passes through the metal sheet 50 to the pole 30, external current can be transmitted to the battery cell 40 through the pole 30, and the current output by the battery cell 40 can be output to the outside through the pole 30. Since the first fixed part 51, the connecting part 52 and the second fixed part 53 are sequentially arranged along the X-axis direction (i.e. the first direction), the first fixed part 51 is electrically connected with the pole 30, and the second fixed part 53 is electrically connected with the tab 411 of the battery cell 40; when the battery 100 has an electrical fault (for example, short circuit or the power of the current transmitted in the battery 100 is greater than the rated power), the current transmitted in the metal sheet 50 (i.e. the first metal sheet 50a) is greater than or equal to the threshold value, the connecting part 52a is heated and fused, and the first fixed part 51a is spaced from the second fixed part 53a, so that the circulation of the current in the battery 100 is cut off, thereby avoiding the battery cell 40 from overheating and burning out, and the use safety of the battery 100 is improved. Compared with the prior art, in the embodiment, when the current transmitted in the metal sheet 50 (e.g. the first metal sheet 50a) is greater than or equal to the threshold value, the memory metal sheet 70 is heated and bent, and the first fixed part 51a is bent, so that the projection of the matching end face 54a of the first fixed part 51a along the X-axis direction (i.e. the first direction) is spaced from the projection of the matching end face 54b of the second fixed part 53a along the X-axis direction (i.e. the first direction), not only can the spaced first fixed part 51a and the second fixed part 53a be prevented from being re-fused together, but also can the spaced first fixed part 51a and the second fixed part 53a be prevented from arc phenomenon, the reliability of the metal sheet 50 for protecting the battery 100 is greatly improved, the probability of thermal runaway of the battery cell 40 is effectively reduced, and the use safety of the battery 100 is improved. Moreover, the structure is simple, easy to design, the processing cost is low, and the practicality is high. In addition, in this way, on the basis of improving the reliability of the metal sheet 50 for protecting the battery 100, the bending degree required by the memory metal sheet 70 can be confirmed, the design cost and processing difficulty of the memory metal sheet 70 are reduced, and the processing cost of the battery 100 is reduced.

[0059] The thickness of the connecting part 52a is less than the thickness of the first fixed part 51a and the thickness of the second fixed part 53a, which is beneficial to improve the speed of the connecting part 52a being fused, beneficial to improve the speed of the current in the battery 100 being cut off, beneficial to reduce the probability of the battery cell 40 being damaged due to overheating, and beneficial to improve the use safety of the battery 100.

[0060] In order to facilitate the description of the cooperation relationship between the metal sheet 50 and the memory metal sheet 70, the related features of the metal sheet 50 in the following are specifically the related features of the first metal sheet 50a, the pole 30 is specifically the positive pole 30a, and the tab 411 is specifically the positive tab 411a.

[0061] In some embodiments, the memory metal sheet 70 is made of one-way shape memory alloy. The one-way shape memory alloy has the characteristic of deforming at high temperature and not easily deforming after cooling. In this way, when the memory metal sheet 70 drives the first fixed part 51 to bend, the characteristic of the one-way memory shape alloy is used to ensure that the bending degree of the first fixed part 51 hardly changes during the cooling of the memory metal sheet 70, the spaced first fixed part 51 and the second fixed part 53 are always not re-welded together, and the arc drawing phenomenon always does not occur, which is beneficial to improve the reliability of the metal sheet 50 to protect the battery 100.

[0062] Further, the bending temperature of the memory metal sheet 70 is less than or equal to the melting temperature of the connecting part 52. In this way, it is ensured that the memory metal sheet 70 can immediately drive the first fixed part 51 to bend when the connecting part 52 is melted, which is beneficial to reduce the probability of damage of the battery cell 40 due to overheating, and is beneficial to improve the use safety of the battery 100. In other embodiments, the bending temperature of the memory metal sheet 70 can also be greater than the melting temperature of the connecting part 52.

[0063] Further, the bending stress of the memory metal sheet 70 is greater than the yield stress of the first fixed part 51. In this way, it is ensured that the memory metal sheet 70 can drive the first fixed part 51 to bend quickly, which is beneficial to reduce the probability of damage of the battery cell 40 due to overheating, and is beneficial to improve the use safety of the battery 100.

[0064] In Figure 3 , Figure 5 and Figure 7 embodiments, the metal sheet 50 is made of aluminum (Al). For example, the metal sheet 50 is made of 1060 aluminum. Among them, the yield stress of the first fixed part 51 is 20-50 Mpa (mega pascal), and the melting temperature of the connecting part 52 is 660°C. The memory metal sheet 70 is made of copper (Cu) based one-way shape memory alloy, specifically Cu-Al-Ni (nickel)-Mn alloy. The bending temperature of the memory metal sheet 70 is 100-400°C (degrees Celsius). The bending stress of the memory metal sheet 70 is 400-700 Mpa. Therefore, the bending temperature of the memory metal sheet 70 is less than the melting temperature of the connecting part 52. The bending stress of the memory metal sheet 70 is greater than the yield stress of the first fixed part 51. Because the bending temperature of the memory metal sheet 70 is higher than 100°C, the memory metal sheet 70 deforms at high temperature and does not easily deform after cooling. Among them, the content of Mn in the memory metal sheet 70 can be increased to increase the bending temperature of the memory metal sheet 70, and the appropriate content of Mn can be selected according to the needs.

[0065] In other embodiments, the shape memory metal sheet 70 may also be made of other copper-based single-pass shape memory alloys, such as Cu-Al-Nb (niobium). The shape memory metal sheet 70 may also be made of nickel-titanium single-pass shape memory alloys, such as Ti-Ni-Pd (palladium), Ni-Ti-Hf (hydrogen fluoride), or Ni-Ti-Zr (zirconium). The shape memory metal sheet 70 may also be made of cobalt (Co)-based shape memory alloys, such as Co-Al or Co-Ni-Al. The shape memory metal sheet 70 may also be made of other single-pass shape memory alloys such as Ni-Al, Ni-Mn-Ga (gallium), Zr-Cu, Ti-Nb, or U (uranium)-Nb. In other embodiments, the metal sheet 50 may also be made of other conductive metal materials such as copper or iron.

[0066] In some embodiments, the shape memory metal sheet 70 is disposed on the side of the first fixing portion 51 facing away from the cover 20. Figure 3 , Figure 5 and Figure 6 In the illustrated embodiment, the shape memory metal sheet 70 is fixedly stacked on the side of the first fixing part 51 facing away from the cover 20. This avoids the shape memory metal sheet 70 occupying the area where the first fixing part 51 is fixed to the terminal post 30, which helps to reduce the area of ​​the first fixing part 51, improves space utilization, and contributes to the compact structure of the battery 100. In other embodiments, the shape memory metal sheet 70 may also be disposed on the side of the first fixing part 51 facing the cover 20.

[0067] like Figure 4 , Figure 5 and Figure 6 As shown, in some embodiments, the projection of the shape memory metal sheet 70 along the Z-axis direction at least partially overlaps with the projection of the terminal post 30 along the Z-axis direction. This helps to reduce the area of ​​the first fixing part 51, improves space utilization, and facilitates a more compact structure for the battery 100. Specifically, the projection of the shape memory metal sheet 70 along the Z-axis direction completely overlaps with the projection of the terminal post 30 along the Z-axis direction. In other embodiments, the projection of the shape memory metal sheet 70 along the Z-axis direction may also partially overlap with the projection of the terminal post 30 along the Z-axis direction. In still other embodiments, the projection of the shape memory metal sheet 70 along the Z-axis direction may be spaced apart from the projection of the terminal post 30 along the Z-axis direction. As the first fixing part 51 bends with the shape memory metal sheet 70, the space occupied by the shape memory metal sheet 70 and the space occupied by the first fixing part 51 in the Z-axis direction change; this prevents the terminal post 30 from interfering with the bending of the shape memory metal sheet 70 and the first fixing part 51, improving the reliability of the bending of the shape memory metal sheet 70 and enhancing the safety of the battery 100.

[0068] In some embodiments, the memory metal sheet 70 is at least partially located at the end of the first fixed part 51 close to the connecting part 52. In this way, the bending of the memory metal sheet 70 can exert greater stress on the first fixed part 51 to drive the first fixed part 51 to bend, which is conducive to increasing the bending speed of the first fixed part 51, increasing the bending degree of the first fixed part 51, reducing the probability of damage caused by overheating of the battery cell 40, and improving the use safety of the battery 100.

[0069] As shown in Figure 4 , Figure 5 and Figure 7 , in some embodiments, the first fixed part 51 includes a main body 511 and a matching end 512, and the matching end 512 is fixedly connected between the connecting part 52 and the main body 511. In the Y-axis direction (i.e., the direction perpendicular to the first direction and the thickness direction of the cover 20), the main body 511 is located on one side of the connecting part 52, and the matching end 512 is partially located on one side of the main body 511 close to the connecting part 52. The memory metal sheet 70 is fixedly stacked with the matching end 512. The matching end surface 54a of the first fixed part 51 is the surface of the matching end 512 facing away from the main body 511 in the X-axis direction.

[0070] The main body 511 is fixedly stacked on the side of the pole 30 facing away from the cover 20. The memory metal sheet 70 extends along the Y-axis direction, and the projection of the memory metal sheet 70 along the Z-axis direction overlaps the projection of the matching end 512 along the Z-axis direction. The memory metal sheet 70 is partially located in the matching end 512 (i.e., the end of the first fixed part 51 close to the connecting part 52). In other embodiments, the projection of the memory metal sheet 70 along the Z-axis direction can also overlap the projection of the matching end 512 along the Z-axis direction, and the memory metal sheet 70 can also be entirely located in the matching end 512.

[0071] In the embodiments shown in Figure 4 , Figure 5 and Figure 7 , the memory metal sheet 70 bends in the first bending direction W1 when the current transmitted in the metal sheet 50 is greater than or equal to a threshold value. The two ends of the memory metal sheet 70 are close to each other in the Y-axis direction, and the memory metal sheet 70 drives the matching end 512 to bend relative to the main body 511 in the first bending direction W1, so that the projection of the matching end 512 in the X-axis direction is spaced apart from the projection of the second fixed part 53 in the X-axis direction. When the current transmitted in the metal sheet 50 is greater than or equal to the threshold value, the projection of the first fixed part 51 in the X-axis direction is spaced apart from the projection of the second fixed part 53 in the X-axis direction.

[0072] Since the matching end portion 512 is fixedly connected between the connecting portion 52 and the main body 511, the memory metal sheet 70 is fixedly stacked with the matching end portion 512; when the connecting portion 52 is fused, the memory metal sheet 70 can drive the matching end portion 512 to bend relative to the main body 511 to improve the reliability of the metal sheet 50 in protecting the battery 100. Due to such a design, a step surface is formed between the matching end portion 512 and the main body 511, which is beneficial to reduce the difficulty of the memory metal sheet 70 driving the matching end portion 512 to bend, is beneficial to improve the bending speed of the matching end portion 512, is beneficial to increase the bending degree of the matching end portion 512, is beneficial to reduce the probability of the battery cell 40 being damaged due to overheating, and is beneficial to improve the use safety of the battery 100.

[0073] In some other embodiments, the size of the main body 511 along the Y-axis direction can also be greater than or equal to the size of the matching end portion 512 along the Y-axis direction, and the projection of the matching end portion 512 along the Y-axis direction is entirely located in the projection of the main body 511 along the Y-axis direction. In the case that the current transmitted in the metal sheet 50 is greater than or equal to the threshold value, the projection of the first fixed portion 51 along the X-axis direction can also partially overlap with the projection of the second fixed portion 53 along the X-axis direction.

[0074] As shown in Figure 4 , Figure 5 and Figure 6 , in some embodiments, in the case that the current transmitted in the metal sheet 50 is greater than or equal to the threshold value, the memory metal sheet 70 bends in a direction away from the cover 20. In the embodiments shown in Figure 4 , Figure 5 and Figure 6 , in the case that the current transmitted in the metal sheet 50 is greater than or equal to the threshold value, one end of the memory metal sheet 70 bends along the positive direction of the first bending direction W1, and the other end of the memory metal sheet 70 bends along the negative direction of the first bending direction W1. Both ends of the memory metal sheet 70 bend in a direction away from the cover 20. In this way, space is reserved for bending between the cover 20 and the metal sheet 50, which is beneficial to reduce the space between the cover 20 and the metal sheet 50, improve the space utilization, and compact the structure of the battery 100.

[0075] In some embodiments, the first fixing portion 51 is provided with an opening 513 penetrating the first fixing portion 51 along the Z-axis direction (i.e. the thickness direction of the cover 20), and located on one side of the connecting portion 52 along the Y-axis direction (i.e. the direction perpendicular to the first direction and the thickness direction of the cover 20), and faces the connecting portion 52 along the X-axis direction (i.e. the first direction). The memory metal sheet 70 partially overlaps the projection of the opening 513 along the Z-axis direction (i.e. the projection of the thickness direction of the cover 20) along the Z-axis direction (i.e. the thickness direction of the cover 20). In this way, the opening 513 can reduce the strength of the first fixing portion 51, which is conducive to reducing the difficulty of bending the first fixing portion 51 by the memory metal sheet 70, reducing the bending stress requirement of the memory metal sheet 70, and reducing the processing cost of the memory metal sheet 70.

[0076] In Figure 4 、 Figure 5 and Figure 6 the embodiments shown, the projections of the two end portions of the memory metal sheet 70 along the Z-axis direction are located on both sides of the projection of the opening 513 along the Z-axis direction. In this way, it is conducive to improving the connection stability of the memory metal sheet 70 and the matching end portion 512, reducing the difficulty of bending the matching end portion 512 by the memory metal sheet 70, improving the bending speed of the matching end portion 512, increasing the bending degree of the matching end portion 512, reducing the probability of damage caused by overheating of the battery cell 40, and improving the use safety of the battery 100.

[0077] As Figure 4 、 Figure 5 and Figure 7 shown, in some embodiments, the number of connecting portions 52 and the number of second fixing portions 53 are both multiple, and the first fixing portion 51 is fixedly connected with one connecting portion 52 and one second fixing portion 53. Along the Y-axis direction (i.e. the direction perpendicular to the first direction and the thickness direction of the cover 20), the multiple second fixing portions 53 are sequentially and spacedly arranged.

[0078] In Figure 4 、 Figure 5 and Figure 7In the illustrated embodiment, there are two second fixing parts 53 and two connecting parts 52. The two second fixing parts 53 are located on both sides of the opening 513 in the Y-axis direction. The two second fixing parts 53 are fixedly connected to the first fixing part 51 through the two connecting parts 52 respectively. Specifically, one second fixing part 53 is fixedly connected to the tab 411 (specifically the positive tab 411a) of one battery cell body 41; the other second fixing part 53 is fixedly connected to the tab 411 (specifically the positive tab 411a) of another battery cell body 41. When the current transmitted in the metal sheet 50 is greater than or equal to the threshold, the shape memory metal sheet 70 causes the mating end 512 to bend, so that the projection of the mating end 512 along the X-axis direction is located between the projections of the two second fixing parts 53 along the X-axis direction, and the projection of the mating end face 54a of the first fixing part 51 along the X-axis direction is located between the projections of the mating end faces 54b of the two second fixing parts 53 along the X-axis direction.

[0079] Since the first fixing part 51 is fixedly stacked with the memory metal sheet 70, the first fixing part 51 is fixedly connected to a second fixing part 53 through a connecting part 52. In the Y-axis direction (that is, the direction perpendicular to both the first direction and the thickness direction of the cover 20), multiple second fixing parts 53 are arranged sequentially at intervals. By driving the first fixing part 51 to bend through the memory metal sheet 70, the first fixing part 51 and multiple second fixing parts 53 can be prevented from being re-welded, and the arcing phenomenon between the first fixing part 51 and multiple second fixing parts 53 can be avoided. This is beneficial to improving the utilization rate of the memory metal sheet 70 and reducing the processing cost of the battery 100.

[0080] like Figure 2 , Figure 3 and Figure 4 As shown, in some embodiments, the cover 20 includes a cover plate 22 and a lower plastic component 23. The cover plate 22 and the battery housing 10 together form a receiving cavity 60. Specifically, in the Z-axis direction, the cover plate 22 is disposed on one side of the battery housing 10 and covers the receiving opening 61 of the receiving cavity 60, thus closing the receiving cavity 60. In the Z-axis direction, the lower plastic component 23 is fixedly stacked on the side of the cover plate 22 facing the receiving cavity 60. A mounting hole 21 penetrates the cover plate 22 and the lower plastic component 23 along the Z-axis direction. The first part 31 of the terminal post 30 passes through the cover plate 22 and the lower plastic component 23 and is partially exposed on the side of the cover plate 22 facing away from the lower plastic component 23. The second part 32 of the terminal post 30 contacts or abuts against the lower plastic component 23. In other embodiments, the second part 32 may also be spaced apart from the lower plastic component 23. The design of the lower plastic part 23 can prevent the battery cell 40's tab 411 from coming into contact with the cover plate 22 and causing a short circuit, which helps to improve the safety of the battery 100.

[0081] In some embodiments, the battery 100 further comprises an upper plastic member 80 and a sealing member 90. The upper plastic member 80 is sleeved on the outside of the pole 30, and the pole 30 is insulated from the cover 20 by the upper plastic member 80. Specifically, the upper plastic member 80 is sleeved on the outside of the first part 31 of the pole 30 and abuts against the second part 32. The upper plastic member 80 is partially accommodated in the mounting hole 21 and partially exposed on the side of the cover plate 22 away from the lower plastic member 23. The first part 31 of the pole 30 is insulated from the cover plate 22 by the upper plastic member 80. In this way, the short circuit caused by the contact between the pole 30 and the cover plate 22 can be avoided, and the use safety of the battery 100 is improved.

[0082] In some embodiments, the sealing member 90 is sleeved on the outside of the upper plastic member 80 and accommodated in the cover 20. The upper plastic member 80 cooperates with the sealing member 90 to seal the accommodation cavity 60. Specifically, the sealing member 90 is accommodated in the mounting hole 21 and abuts between the cover plate 22 and the lower plastic member 23. The design of the sealing member 90 improves the sealing performance of the accommodation cavity 60, prevents foreign matters such as dust from entering the accommodation cavity 60, and improves the performance of the battery 100.

[0083] Please refer to Figure 8 、 Figure 9 and Figure 10 , and combine with Figure 5 , Figure 8 is another partial structure diagram of a battery 100 provided by the embodiments of the present application. Figure 9 is a perspective structure diagram of the first metal sheet 50a of the battery 100 shown in Figure 8 . Figure 10 is a structure diagram of the first metal sheet 50a after being melted at another angle shown in Figure 9 .

[0084] As shown in Figure 5 、 Figure 8 and Figure 9 , Figure 8 and Figure 9 , the embodiments shown in Figure 5 are similar in structure, and the difference between the two is that the metal sheet 50 and the memory metal sheet 70 are arranged differently. Specifically, the opening 513 can be omitted, the cooperation relationship between the memory metal sheet 70 and the first fixing part 51 of the metal sheet 50 is different, and the bending direction of the memory metal sheet 70 is different.

[0085] As shown in Figure 8 、 Figure 9 and Figure 10 , in Figure 8 、 Figure 9 and Figure 10In the shown embodiment, the first fixed part 51, the connecting part 52 and the second fixed part 53 are sequentially arranged along the X-axis direction (i.e. the first direction). The first fixed part 51 is a rectangular plate. The first fixed part 51 is fixedly connected with two second fixed parts 53 through one connecting part 52 respectively. In the Y-axis direction, the two second fixed parts 53 are arranged at intervals. The first fixed part 51 is electrically connected with the pole column 30. The second fixed part 53 is electrically connected with the tab 411 of the battery cell 40. The memory metal sheet 70 is fixedly stacked with the first fixed part 51 and extends along the X-axis direction. Among them, the memory metal sheet 70 is partially located at the end of the first fixed part 51 close to the connecting part 52.

[0086] In the case that the current transmitted in the metal sheet 50 is greater than or equal to the threshold value, the connecting part 52 is fused and a fracture 55 is formed, the memory metal sheet 70 and the first fixed part 51 bend along the second bending direction W2 away from the fracture 55, and the memory metal sheet 70 is used to make the distance l between the first fixed part 51 and the second fixed part 53 along the X-axis direction (i.e. the first direction) greater than the size d of the connecting part 52 along the X-axis direction (i.e. the first direction). The second bending direction W2 is perpendicular to the Y-axis direction (i.e. the direction perpendicular to the first direction and the thickness direction of the cover body 20). Specifically, the end of the memory metal sheet 70 close to the second fixed part 53 in the X-axis direction bends along the positive direction of the second bending direction W2 away from the second fixed part 53, and the end of the first fixed part 51 close to the second fixed part 53 in the X-axis direction bends along the positive direction of the second bending direction W2 away from the second fixed part 53. The end of the memory metal sheet 70 close to the second fixed part 53 in the X-axis direction is away from the cover body 20. The end of the first fixed part 51 close to the second fixed part 53 in the X-axis direction is away from the cover body 20.

[0087] In the battery 100 provided in this embodiment, the tab 411 of the cell 40 is connected to the terminal 30 via a metal sheet 50. External current can be transmitted and stored in the cell 40 through the terminal 30, and the current output from the cell 40 can be output to the outside through the terminal 30. Since the first fixing part 51, the connecting part 52, and the second fixing part 53 are arranged sequentially along the X-axis direction (i.e., the first direction), the first fixing part 51 is electrically connected to the terminal 30, and the second fixing part 53 is electrically connected to the tab 411 of the cell 40; when the battery 100 experiences an electrical fault (e.g., a short circuit or the power of the current transmitted in the battery 100 is greater than the rated power), the current transmitted in the metal sheet 50 (i.e., the first metal sheet 50a) is greater than or equal to a threshold, the connecting part 52a melts due to heat, and the first fixing part 51a and the second fixing part 53a are separated. This can cut off the current flow in the battery 100 to prevent the cell 40 from overheating and burning, which is beneficial to improving the safety of the battery 100. Compared to existing technologies, in this embodiment, when the current transmitted in the metal sheet 50 is greater than or equal to a threshold, the shape memory metal sheet 70 will bend due to heat, causing the first fixing part 51 to bend. This results in the distance l between the first fixing part 51 and the second fixing part 53 along the X-axis (i.e., the first direction) being greater than the dimension d of the connecting part 52 along the X-axis (i.e., the first direction). This not only prevents the spaced first fixing part 51 and the second fixing part 53 from re-welding together, but also prevents arcing between the spaced first fixing part 51a and the second fixing part 53a. This greatly improves the reliability of the metal sheet 50 in protecting the battery 100, effectively reduces the probability of thermal runaway in the cell 40, and is beneficial to improving the safety of the battery 100. Moreover, the structure is simple, easy to design, has low processing cost, and is highly practical. In addition, this allows control of the bending degree of the first fixing part 51a by controlling the bending degree of the shape memory metal sheet 70, thereby controlling the distance l between the first fixing part 51 and the second fixing part 53 along the X-axis (i.e., the first direction). While ensuring that the metal sheet 50 provides reliable protection for the battery 100, the bending degree of the first fixing part 51 can be minimized, which helps to reduce the space reserved for bending of the first fixing part 51 and improves the space utilization of the battery 100.

[0088] Understandable. Figure 8 , Figure 9 and Figure 10 In the illustrated embodiment, when the current transmitted in the metal sheet 50 is greater than or equal to a threshold, the design of the shape memory metal sheet 70 such that the distance l between the first fixing part 51 and the second fixing part 53 along the X-axis direction (i.e., the first direction) is greater than the dimension d of the connecting part 52 along the X-axis direction (i.e., the first direction) can be applied to... Figures 1-7 In any of the embodiments shown.

Claims

1. A battery, characterized by, The battery comprises a battery shell, a cover, a pole, a cell and a metal sheet, the battery shell and the cover enclose a receiving cavity, the pole is arranged in the cover, and the cell and the metal sheet are accommodated in the receiving cavity; The metal sheet comprises a first fixed part, a connecting part and a second fixed part arranged in sequence along a first direction, the first fixed part and the second fixed part each comprise a matching end face fixedly connected with the connecting part; the first fixed part is electrically connected with the pole, the second fixed part is electrically connected with a tab of the cell, the first direction is perpendicular to the thickness direction of the cover; one side of the first fixed part in the thickness direction of the cover is provided with a memory metal sheet, and the memory metal sheet is fixedly stacked with the first fixed part; In the case that the current transmitted in the metal sheet is greater than or equal to a threshold value, the connecting part is fused, and the memory metal sheet is used to make the projection of the matching end face of the first fixed part along the first direction and the projection of the matching end face of the second fixed part along the first direction are arranged in a spaced manner.

2. The battery of claim 1, wherein, The thickness of the connecting part is less than the thickness of the first fixed part and the thickness of the second fixed part.

3. The battery according to claim 1 or 2, characterized in that, The memory metal sheet is at least partially located at the end of the first fixed part close to the connecting part.

4. The battery according to any one of claims 1 to 3, characterized in that, The first fixed part comprises a main body and a matching end part, the matching end part is fixedly connected between the connecting part and the main body, in a direction perpendicular to both the first direction and the thickness direction of the cover, the main body is located on one side of the connecting part, the matching end part is partially located on one side of the main body close to the connecting part, and the memory metal sheet is fixedly stacked with the matching end part.

5. The battery according to any one of claims 1 to 4, characterized in that, The first fixed part is provided with an opening, the opening penetrates the first fixed part along the thickness direction of the cover, is located on one side of the connecting part in a direction perpendicular to both the first direction and the thickness direction of the cover, and faces the connecting part along the first direction, and the projection of the memory metal sheet along the thickness direction of the cover partially overlaps the projection of the opening along the thickness direction of the cover.

6. The battery according to any one of claims 1 to 5, characterized in that, The number of the connecting parts and the number of the second fixed parts are both plural, one of the connecting parts and one of the second fixed parts are fixedly connected with the first fixed part, and the plural second fixed parts are arranged in sequence and in a spaced manner in a direction perpendicular to both the first direction and the thickness direction of the cover.

7. The battery according to any one of claims 1 to 6, wherein In the case that the current transmitted in the metal sheet is greater than or equal to a threshold value, the memory metal sheet is bent away from the cover.

8. The battery according to any one of claims 1 to 7, characterized in that, The memory metal sheet is arranged on the side of the first fixed part away from the cover.

9. The battery according to any one of claims 1 to 8, characterized in that The memory metal sheet is made of one-way shape memory alloy.

10. The battery according to any one of claims 1 to 9, characterized in that, The bending temperature of the memory metal sheet is less than or equal to the fusing temperature of the connecting part.

11. The battery of any one of claims 1-10, wherein, The bending stress of the memory metal sheet is greater than the yield stress of the first fixed part.

12. A battery, characterized by The battery comprises a battery shell, a cover, a pole, a cell and a metal sheet, the battery shell and the cover enclose a receiving cavity, the pole is arranged in the cover, and the cell and the metal sheet are accommodated in the receiving cavity; The metal sheet comprises a first fixed part, a connecting part and a second fixed part arranged in sequence along a first direction, the first fixed part is electrically connected with the pole column, the second fixed part is electrically connected with the tab of the battery cell, the first direction is perpendicular to the thickness direction of the cover body; one side of the first fixed part in the thickness direction of the cover body is provided with a memory metal sheet, the memory metal sheet is fixedly laminated with the first fixed part; In the case that the current transmitted in the metal sheet is greater than or equal to a threshold value, the connecting part is fused, and the memory metal sheet is used to make the interval between the first fixed part and the second fixed part along the first direction greater than the size of the connecting part along the first direction.

13. A battery pack, characterized by The battery pack comprises a plurality of batteries according to any one of claims 1-12, and the plurality of batteries are electrically connected.

14. An energy storage device, comprising: The battery pack comprises a containing shell and the battery pack according to claim 13, and the battery pack is contained in the containing shell.

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