Battery

Abstract

The utility model relates to the technical field of batteries, in particular to a battery. The battery comprises: a housing having an accommodation space, the housing comprising a first plate body, a second plate body and a side plate, the first plate body and the second plate body being oppositely arranged, the side plate being arranged between the first plate body and the second plate body, the first plate body, the second plate body and the side plate enclosing the accommodation space; the battery cell is arranged in the accommodating space; the battery cell comprises a first pole piece and a second pole piece, and the polarities of the first pole piece and the second pole piece are different; the elastic conductive piece is arranged on the side plate and located in the containing space, the first end of the elastic conductive piece is connected with the shell, and the second end of the elastic conductive piece is provided with a connecting part. By applying the technical scheme provided by the invention, the problem of low safety of the steel shell battery in the related technology can be effectively solved.

Description

Technical Field

[0001] The present application relates to the field of batteries, and in particular to a battery. Background Art

[0002] New energy batteries are an indispensable part of new energy vehicles. Current new energy batteries include steel shell batteries. As a new form of structural battery, the safety and sealing of steel shell batteries have become a concern.

[0003] Due to their structural characteristics, steel-shell batteries are prone to explosion when thermal runaway occurs. Related technologies use a weak area on the steel-shell battery to form a pressure relief valve. The air pressure generated when the battery thermally runs away will break through the pressure relief valve to avoid more serious safety accidents.

[0004] However, the pressure relief valve often fails to achieve the expected effect. When the depth of the weak area is too small, it cannot rupture and release the pressure in time. When the depth of the weak area is too large, it is easy to rupture and fail during the battery drop test, and there will be safety risks of explosion and failure during use. Utility Model Content

[0005] The present application provides a battery to solve the problem of low safety of steel shell batteries in the related art.

[0006] In one aspect, the present application provides a battery, comprising:

[0007] A housing having a storage space, wherein the housing comprises a first plate body, a second plate body and a side plate, wherein the first plate body and the second plate body are arranged opposite to each other, and the side plate is arranged between the first plate body and the second plate body, and the first plate body, the second plate body and the side plate enclose the storage space;

[0008] The battery cell is arranged in the accommodation space; the battery cell comprises a first pole piece and a second pole piece, and the first pole piece and the second pole piece have different polarities;

[0009] The elastic conductive member is arranged on the side plate and located in the accommodating space. The first end of the elastic conductive member is connected to the shell, and the second end of the elastic conductive member is provided with a connecting portion.

[0010] In some embodiments, the battery further includes a limiting member, which is disposed in the accommodating space and located at the second end of the elastic conductive member.

[0011] In some embodiments, the limiting member includes adhesive, and the adhesive bonds the second end of the elastic conductive member and the shell.

[0012] In some embodiments, the adhesive wraps the connection portion; and / or the adhesive has an overlapping area that overlaps with the elastic conductive member, and the ratio of the length D1 of the overlapping area in the extension direction of the elastic conductive member to the length D2 of the elastic conductive member is between 0.1 and 0.3.

[0013] In some embodiments, the elastic conductive member includes a spring sheet, a first end of the spring sheet is connected to the housing, a second end of the spring sheet is limited to the limiting member, and the connecting portion is disposed at the second end of the spring sheet;

[0014] And / or, the connecting portion includes a puncture needle, and the tip of the puncture needle faces the battery cell.

[0015] In some embodiments, a pressure relief valve is further provided on the side plate, and the notch of the pressure relief valve does not overlap with the elastic conductive member.

[0016] In some embodiments, the limiting member includes a protrusion disposed on the first plate body and / or the second plate body, and the protrusion is located between the elastic conductive member and the battery core.

[0017] In some embodiments, the side panels include a first side panel and a second side panel disposed at intervals, and a third side panel and a fourth side panel disposed between the first side panel and the second side panel;

[0018] The first side plate includes a first plate segment, a second plate segment and a third plate segment, a first end of the second plate segment is connected to the first plate segment and is arranged at an angle to the first plate segment, a second end of the second plate segment is connected to the third plate segment and is arranged at an angle to the third plate segment, and a distance H1 between the third plate segment and the second side plate is smaller than a distance H2 between the first plate segment and the second side plate;

[0019] The first end of the elastic conductive member is connected to the second plate segment, and the second end of the elastic conductive member is arranged in close contact with the connection between the second plate segment and the third plate segment.

[0020] In some embodiments, an arc transition plate is provided between the second plate segment and the third plate segment, and the second end of the elastic conductive member is disposed in close contact with the arc transition plate.

[0021] In some embodiments, there is a predetermined distance L1 between the connecting portion and the end surface of the second end of the elastic conductive member, and the predetermined distance L1 and the length L2 of the arc transition plate satisfy: 1 / 3≤L1: L2≤2 / 3;

[0022] And / or, the pressure relief valve is arranged on the second plate section.

[0023] In some embodiments, the distance between the connecting portion and the battery cell is greater than or equal to 0.5 mm;

[0024] And / or, the first end of the elastic conductive member is welded to the shell to form a weld mark, and the battery further comprises a protective adhesive tape, which is attached to the surface of the elastic conductive member facing the battery cell and covers the weld mark;

[0025] And / or, an electrode structure is arranged on the side shell, an insulating member is arranged between the battery cell and the electrode structure, the battery cell includes a battery cell body and a pole piece arranged on the battery cell body, the pole piece passes through the insulating member and is connected, and the first end of the elastic conductive member does not extend beyond the top surface of the battery cell body close to the electrode structure.

[0026] The battery provided in the present application includes a shell, a battery cell, and an elastic conductive member. The shell has a storage space, an electrode structure and a pressure relief valve are arranged on the shell, and the battery cell is arranged in the storage space and connected to the electrode structure. When the battery is operating normally, the second end of the elastic conductive member is away from the battery cell, so that the connecting portion arranged at the second end of the elastic conductive member can avoid the battery cell, so that the battery can operate normally. When the battery thermally runs away, the temperature in the storage space rises rapidly. At this time, the connecting portion located at the second end of the elastic conductive member can penetrate into the battery cell, causing a short circuit in the battery cell, so that the battery voltage quickly reaches a zero voltage state, preventing the battery from further thermal runaway, thereby increasing the safety of the battery. In addition, since an elastic conductive member is provided to reduce the degree of danger during thermal runaway of the battery, the depth of the pressure relief valve can be set smaller to ensure the pass rate of the battery drop test. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

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

[0029] Figure 2 A schematic diagram of the exploded structure of a battery provided in an embodiment of the present application;

[0030] Figure 3 for Figure 2 A schematic diagram of a partial structure of a battery;

[0031] Figure 4 for Figure 3 A schematic diagram of a partial structure of a battery;

[0032] Figure 5 A schematic diagram of the structure of an elastic conductive member of a battery provided in an embodiment of the present application;

[0033] Figure 6 A schematic diagram of a portion of the structure of a battery housing provided in an embodiment of the present application;

[0034] Figure 7 A schematic diagram of a partial structure of a battery provided in an embodiment of the present application;

[0035] Figure 8 This is a schematic diagram of the structure of the battery housing and the elastic conductive member provided in an embodiment of the present application, wherein: Figure 8 A schematic diagram showing the structure when the second end of the elastic conductive member is in the initial position and the limiting member is in the limiting state;

[0036] Fig. 9This is a schematic diagram of the structure of the battery housing and the elastic conductive member provided in an embodiment of the present application, wherein: Fig. 9 A structural schematic diagram is shown when the second end of the elastic conductive member is in the second position and the limiting member is in the released state.

[0037] Description of reference numerals:

[0038] 10. Battery;

[0039] 100, housing; 101, accommodating space; 110, first plate body; 120, second plate body; 130, side plate; 131, first side plate; 1311, first plate segment; 1312, second plate segment; 1313, third plate segment; 1314, arc transition plate; 132, second side plate; 133, third side plate; 134, fourth side plate;

[0040] 200. Electrode structure;

[0041] 300, pressure relief valve;

[0042] 400, battery cell;

[0043] 500, elastic conductive parts;

[0044] 600, connecting part;

[0045] 700, a stopper; 710, an adhesive; 720, a convex portion;

[0046] 800. Insulating parts. DETAILED DESCRIPTION

[0047] In order to make the purpose, technical solutions and advantages of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0048] New energy batteries are an indispensable part of new energy vehicles and renewable energy systems. Current new energy batteries include steel shell batteries. As a new form of structural battery, the safety and sealing of steel shell batteries have become issues of concern.

[0049] Steel-shell batteries have a high structural strength. When thermal runaway occurs, the gas pressure needs to accumulate to a certain level before it can break through the steel shell. Therefore, it is easy to explode, which is very destructive and may cause serious safety accidents. In related technologies, a weak area is set on the steel-shell battery to form a pressure relief valve. The pressure relief valve is generally processed by grooves. Since a weak area is formed on the steel shell, a small accumulation of gas pressure can open the pressure relief valve to release pressure, thereby avoiding more serious safety accidents.

[0050] However, the current pressure relief valves often fail to achieve the expected effects. When the depth of the weak area is too small, they cannot rupture and release pressure in time. When the depth of the weak area is too large, it is easy to rupture and fail during the battery drop test, and there will be safety risks of explosion and failure during use.

[0051] In view of this, the present application provides a battery, which adds an elastic conductive member in the battery, and when the battery is in thermal runaway, the elastic conductive member punctures the battery cell to form a short circuit, thereby causing the battery voltage to drop rapidly, reducing the probability of the battery cell generating a more serious safety risk. Since the elastic conductive member is provided to reduce the danger level when the battery is in thermal runaway, the depth of the pressure relief valve can be set smaller to ensure the pass rate of the battery drop test.

[0052] The top cover assembly and battery provided in the embodiment of the present application are described below in conjunction with the accompanying drawings. It should be noted that the battery provided in the embodiment of the present application can be a secondary battery, that is, the battery in the embodiment of the present application can be charged and discharged and recycled, and the specific type of battery can include but is not limited to lithium batteries, etc., and the battery can be used in scenarios including but not limited to electronic products, energy storage equipment, transportation vehicles, etc., such as mobile communication equipment, new energy vehicles, drones, etc., which are not specifically limited in the embodiment of the present application.

[0053] Figure 1 A schematic diagram of the three-dimensional structure of a battery provided in an embodiment of the present application; Figure 2 A schematic diagram of the exploded structure of a battery provided in an embodiment of the present application; Figure 3 for Figure 2 A schematic diagram of a partial structure of a battery;

[0054] Figure 4 for Figure 3 A schematic diagram of a partial structure of a battery; Figure 6 A schematic diagram of a portion of the structure of a battery shell provided in an embodiment of the present application.

[0055] like Figures 1 to 4 as well as Figure 6 As shown, the battery 10 of this embodiment includes: a housing 100 , a battery cell 400 , and an elastic conductive member 500 .

[0056] Among them, the shell 100 has a accommodating space 101, the shell 100 includes a first plate body 110, a second plate body 120 and a side plate 130, the first plate body 110 and the second plate body 120 are arranged opposite to each other, the side plate 130 is arranged between the first plate body 110 and the second plate body 120, the first plate body 110, the second plate body 120 and the side plate 130 surround the accommodating space 101, and the elastic conductive member 500 is arranged on the side plate 130.

[0057] The side plate 130 of the housing 100 is provided with an electrode structure 200 and a pressure relief valve 300, and the battery cell 400 is provided in the accommodation space 101 and connected to the electrode structure 200. Specifically, the battery cell 400 includes a first pole piece and a second pole piece, and the first pole piece and the second pole piece have different polarities.

[0058] The elastic conductive member 500 is disposed in the accommodating space 101 , a first end of the elastic conductive member 500 is connected to the housing 100 , and a connecting portion 600 is disposed at a second end of the elastic conductive member 500 .

[0059] By applying the technical solution of this embodiment, the elastic conductive member 500 has an initial position in which the connecting portion 600 is away from the battery cell 400 and a second position in which the connecting portion 600 pierces the battery cell 400. When the battery is operating normally, the connecting portion 600 at the second end of the elastic conductive member 500 can avoid the battery cell 400, so that the battery can operate normally. When the battery is in thermal runaway, the temperature in the accommodating space 101 rises rapidly. At this time, the connecting portion 600 at the second end of the elastic conductive member 500 can penetrate into the battery cell 400, causing a short circuit in the battery cell 400, causing the battery voltage to quickly reach a zero voltage state, preventing the battery from further thermal runaway, thereby increasing the safety of the battery. In addition, since an elastic conductive member is provided to reduce the degree of danger during thermal runaway of the battery, the depth of the pressure relief valve 300 can be set smaller to ensure the pass rate of the battery drop test.

[0060] It should be noted that the elastic conductive member 500 is arranged on the side plate to ensure that the connecting portion 600 faces the side of the battery cell 400, so that the connecting portion 600 can more easily pierce the positive electrode sheet, the negative electrode sheet and the diaphragm of the battery cell 400. The elastic conductive member includes an initial position away from the battery cell and a second position that connects the first electrode sheet and the second electrode sheet.

[0061] Specifically, when processing the battery cell, the positive electrode sheet, the diaphragm and the negative electrode sheet are generally overlapped, and the diaphragm is arranged between the positive electrode sheet and the negative electrode sheet, and then the battery cell is formed by winding or stacking. Therefore, puncturing the side of the battery cell 400 is more likely to form a short circuit than puncturing the top or bottom surface of the battery cell 400. Therefore, the elastic conductive member 500 can be set on the side panel 130.

[0062] It should also be noted that the electrode structure 200 includes a positive electrode column and a negative electrode column, and the battery cell 400 includes a battery cell body and a positive electrode ear and a negative electrode ear connected to the battery cell body, the positive electrode ear is connected to the positive electrode column, and the negative electrode ear is connected to the negative electrode column. The battery cell body is composed of a first electrode sheet, a second electrode sheet, and a diaphragm. Exemplarily, the first electrode sheet can be a positive electrode sheet, and the second electrode sheet can be a negative electrode sheet.

[0063] In some embodiments, the battery further includes a stopper 700 , which is disposed in the accommodation space and located at the second end of the elastic conductive member.

[0064] Specifically, the limiting member 700 has a limiting state and a releasing state. When the battery is working normally, the limiting member 700 can be in the limiting state, thereby limiting the elastic conductive member 500, so that the second end of the elastic conductive member 500 is away from the battery cell 400, and then the connecting portion 600 arranged at the second end of the elastic conductive member 500 can avoid the battery cell 400, so that the battery can work normally. When the battery is in thermal runaway, the temperature in the accommodating space 101 rises rapidly, causing the internal air pressure to increase rapidly. At this time, the limiting member 700 can be in the releasing state. When the limiting member 700 is in the releasing state, the limiting member 700 no longer forms a stop for the second end of the elastic conductive member 500, so that the connecting portion 600 located at the second end of the elastic conductive member 500 can penetrate into the battery cell 400, causing a short circuit of the battery cell 400, causing the battery voltage to quickly reach a zero voltage state, preventing the battery from further thermal runaway, thereby increasing the safety of the battery.

[0065] In some embodiments, the elastic conductive member 500 may be made of metal, which can satisfy the conductive performance of the elastic conductive member 500. At the same time, since the metal material has ductility and toughness, it can also ensure that the elastic conductive member 500 has good elastic recovery force. The connecting portion 600 may also be made of metal to satisfy its conductive performance.

[0066] Figure 5 A schematic diagram of the structure of the elastic conductive member of the battery provided in the embodiment of the present application, as shown in FIG. Figure 5 As shown, the elastic conductive member 500 includes a spring sheet, a first end of which is connected to the housing 100 , a second end of which is limited by a limiting member 700 , and a connecting portion 600 is disposed at the second end of the spring sheet.

[0067] In the above structure, the sheet-like structure has the advantages of small space occupation, easy accumulation of elastic potential energy, and convenient processing. Therefore, setting the elastic conductive member 500 as a spring sheet can reduce the space it occupies while ensuring its elasticity, thereby ensuring the energy density of the battery 10.

[0068] It should be noted that the thickness of the spring piece may be between 0.05 mm and 0.2 mm.

[0069] Specifically, Figure 5 As shown, in some embodiments, the connecting portion 600 includes a puncture needle, the tip of which is directed toward the battery cell 400, so that the connecting portion 600 can more easily puncture the positive electrode sheet, the negative electrode sheet and the separator of the battery cell 400, thereby achieving a short-circuit state of the battery cell, so as to quickly reduce the voltage of the battery when the battery thermally runs away, thereby reducing the danger of the battery.

[0070] It should be noted that, in some embodiments, the electrode structure 200, the elastic conductive member 500 and the pressure relief valve 300 are all arranged on the side plate 130. The pressure relief valve 300 is formed by notches, which form a weak area on the side plate. When the battery cell is thermally runaway, the notches can be broken by air pressure, thereby achieving a pressure relief effect and preventing the battery cell from having a more destructive explosion. In order to ensure the pressure relief effect of the pressure relief valve 300, the notches of the pressure relief valve 300 and the elastic conductive member 500 can be made not to overlap each other, thereby avoiding the elastic conductive member 500 from blocking the pressure relief valve 300 and affecting the pressure relief effect of the pressure relief valve 300.

[0071] like Figure 4 As shown, in some embodiments, the limiter 700 may include an adhesive 710, and the adhesive 710 is bonded to the second end of the elastic conductive member 500 and the side plate 130. The adhesive 710 has the characteristic of melting after being heated, so when the battery thermal runaway occurs, its viscosity is significantly reduced due to the increase in temperature, that is, the adhesive 710 changes from a limit state to a release state. At this time, the elastic restoring force of the elastic conductive member 500 can overcome the adhesive force generated by the adhesive 710, thereby moving from the initial position to the second position, causing the battery cell 400 to short-circuit, thereby reducing the risk of further thermal runaway of the battery.

[0072] In some embodiments, the adhesive 710 can wrap the connection portion 600 , thereby reducing the risk of the battery cell 400 being punctured by the connection portion 600 when the battery is operating normally.

[0073] In some embodiments, the adhesive 710 has an overlap region that overlaps with the elastic conductive member 500 , and a ratio of a length D1 of the overlap region in the extension direction of the elastic conductive member 500 to a length D2 of the elastic conductive member 500 is between 0.1 and 0.3.

[0074] In the above structure, if the ratio of D1 to D2 is too small, that is, the adhesive force of the adhesive 710 is small, the elastic conductive member 500 is released prematurely before the battery reaches the thermal runaway state, causing a battery short circuit. If the ratio of D1 to D2 is too large, that is, the adhesive force of the adhesive 710 is large, the elastic conductive member 500 may not be effectively ejected when the battery cell is in thermal runaway, resulting in functional failure. Therefore, setting the ratio of D1 to D2 between 0.1 and 0.3 can ensure that the elastic conductive member 500 can be effectively ejected only when the battery is in thermal runaway, and can remain in an avoidance state when the battery is working normally.

[0075] In some embodiments, the limiting member 700 may also adopt other structures. Figure 7 A schematic diagram of a partial structure of a battery provided in an embodiment of the present application, such as Figure 7 As shown, the stopper 700 may include a convex portion 720 disposed on the first plate 110 and / or the second plate 120 , and the convex portion 720 is located between the elastic conductive member and the battery cell. That is, the convex portion 720 can be stopped at the second end of the elastic conductive member 500 .

[0076] When the battery is operating normally, the protrusion 720 can stop the second end of the elastic conductive member 500, so that the connecting portion 600 is in the initial position to ensure that the battery can operate normally. When the battery is in thermal runaway, the heat of the battery causes the pressure in the accommodating space 101 to increase, causing the shell 100 to expand. At this time, the first plate 110 or the second plate 120 of the shell 100 will be deformed under the action of air pressure, causing the protrusion 720 to lose the stopping effect on the second end of the elastic conductive member 500, that is, the protrusion 720 changes from the limiting state to the released state, causing the second end of the elastic conductive member 500 to be ejected under the action of the elastic restoring force, that is, the second end of the elastic conductive member 500 moves from the initial position to the second position, forming a short circuit of the battery cell 400.

[0077] In some embodiments, when the protrusion 720 is only provided on one of the first plate 110 or the second plate 120, the length of the protrusion 720 may be between 1 / 4 and 1 / 2 of the battery thickness. When both the first plate 110 and the second plate 120 are provided with the protrusion 720, the sum of the two protrusions 720 may be between 1 / 4 and 1 / 2 of the battery thickness.

[0078] It should be noted that the elastic conductive member 500 can be applied to square shell batteries (such as Figure 8 and Fig. 9 As shown), it can also be used in special-shaped steel shell batteries (such as Figure 3 shown).

[0079] Among them, Figure 8As shown, when the elastic conductive member 500 is used in a square-shell battery, the elastic potential energy can be accumulated by relying on the structure of the elastic conductive member 500. Specifically, the elastic conductive member 500 can be configured to include a straight section and an inclined section, wherein the straight section is used to connect to the shell, and the inclined section is inclined relative to the straight section and a connecting portion is provided on the inclined section. When the elastic conductive member 500 is not subjected to external forces, the inclination can maintain an angle with the straight section (such as Fig. 9 As shown in FIG. 1 , the second end of the elastic conductive member 500 is in the second position. The limiting member 700 can limit the second end of the elastic conductive member 500 so that the elastic conductive member 500 can accumulate elastic potential energy. When the battery thermal runaway occurs, the limiting member 700 loses its limiting function, and the second end of the elastic conductive member 500 moves from the initial position to the second position under the action of its own elastic restoring force, causing the battery cell to short-circuit.

[0080] like Figure 3 As shown, in other embodiments, the battery shell 100 may be a special-shaped structure, and the elastic conductive member 500 may follow the special-shaped structure of the shell to form a bending or folding state, thereby achieving the accumulation of elastic potential energy.

[0081] Specifically, the side plate 130 includes a first side plate 131 and a second side plate 132 arranged at intervals, and a third side plate 133 and a fourth side plate 134 arranged between the first side plate 131 and the second side plate 132. The first side plate 131 includes a first plate segment 1311, a second plate segment 1312 and a third plate segment 1313, the first end of the second plate segment 1312 is connected to the first plate segment 1311 and is arranged at an angle to the first plate segment 1311, the second end of the second plate segment 1312 is connected to the third plate segment 1313 and is arranged at an angle to the third plate segment 1313, and the distance H1 between the third plate segment 1313 and the second side plate 132 is less than the distance H2 between the first plate segment 1311 and the second side plate 132. As can be seen from the above structure, the first side plate 131 is a special-shaped structure with two bends, so the elastic conductive member 500 can be installed at a position on the first side plate 131 that is easy to accumulate elastic potential energy.

[0082] Exemplarily, the first end of the elastic conductive member 500 is connected to the second plate segment 1312, and the limiting member 700 limits the first end of the elastic conductive member 500, so that when the elastic conductive member 500 is in the initial position, the second end of the elastic conductive member 500 can be arranged in abutment with the connection between the second plate segment 1312 and the third plate segment 1313 (e.g. Figure 4 As shown in FIG. 1 ), the elastic conductive member 500 is in a bent state, thereby accumulating elastic potential energy. When the battery thermally runs away, the stopper 700 fails, and the second end of the elastic conductive member 500 moves from the initial position to the second position, causing the battery cell to short-circuit.

[0083] It should be noted that the angle between the first plate segment 1311 and the second plate segment 1312 may be between 75° and 100°.

[0084] Furthermore, the angle between the first plate segment 1311 and the second plate segment 1312 is 90°.

[0085] The angle between the second plate segment 1312 and the third plate segment 1313 may be between 75° and 100°.

[0086] Furthermore, the included angle between the second plate segment 1312 and the third plate segment 1313 is 90°.

[0087] In some embodiments, an arc transition plate 1314 is provided between the second plate segment 1312 and the third plate segment 1313. When the elastic conductive member 500 is in the initial position, the second end of the elastic conductive member 500 is arranged in close contact with the arc transition plate 1314. Due to the provision of the arc transition plate 1314, the bending angle of the elastic conductive member 500 is smoother, thereby reducing the probability of rigid deformation of the elastic conductive member 500, thereby ensuring the rebound effect of the elastic conductive member 500.

[0088] It should be noted that there is a predetermined distance L1 between the connecting portion 600 and the end face of the second end of the elastic conductive component 500, and the predetermined distance L1 and the length L2 of the arc transition plate 1314 satisfy: 1 / 3≤L1: L2≤2 / 3, so that the second end of the elastic conductive component 500 has a sufficiently large bending angle, thereby enabling the elastic conductive component 500 to obtain a sufficiently large elastic potential energy.

[0089] Exemplarily, the ratio of L1 to L2 may take values ​​including but not limited to 1 / 3, 1 / 2, and 2 / 3.

[0090] It should be noted that the pressure relief valve 300 is disposed on the second plate section 1312. The second plate section 1312 is not easily deformed and has good stability, so the strength of the pressure relief valve 300 can be ensured and the pass rate of the battery drop test can be improved.

[0091] It should be noted that when the elastic conductive member 500 is at the initial position, the distance between the connecting portion 600 and the battery cell 400 is greater than or equal to 0.5 mm, so as to ensure that the battery cell will not be damaged by the connecting portion 600 and short-circuited when the battery is working normally.

[0092] In some embodiments, the first end of the elastic conductive member 500 is welded to the housing 100 to form a weld mark, and the battery 10 further includes a protective adhesive tape, which is attached to the surface of the elastic conductive member 500 facing the battery cell 400 and covers the weld mark. The protective adhesive tape can cover the weld mark caused by welding, thereby reducing the probability of the weld mark scratching the battery cell and ensuring the service life of the battery.

[0093] Of course, in some embodiments, the welding mark may also be located on the surface of the housing 100 facing away from the accommodating space 101, in which case there is no need to stick protective tape.

[0094] In some embodiments, an insulating member 800 is disposed between the battery cell 400 and the electrode structure 200. The battery cell 400 includes a battery cell 400 body and a pole piece disposed on the battery cell 400 body. The pole piece passes through the insulating member 800 and is connected to the electrode structure 200. The insulating member 800 can ensure the normal operation of the battery cell 400 and prevent the battery cell from short circuiting.

[0095] It should be noted that the first end of the elastic conductive member 500 does not extend beyond the top surface of the battery cell body close to the electrode structure, and there is a sufficient space between the first end of the elastic conductive member 500 and the electrode structure to set the insulating member 800 to prevent the elastic conductive member 500 from interfering with the installation position of the insulating member 800 and causing poor assembly.

[0096] The present application also provides an embodiment of a battery module, the battery module comprising the above-mentioned battery 10. Since the battery 10 has the advantage of high safety, the battery module having the same also has the above-mentioned advantages.

[0097] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, or it can be an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0098] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and 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, and therefore should not be understood as a limitation on the present application.

[0099] The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of this application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the application described herein can be implemented in an order other than those illustrated or described herein, for example.

[0100] In addition, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus that includes a series of steps or elements is not necessarily limited to those steps or elements explicitly listed, but may include other steps or elements not explicitly listed or inherent to such process, method, product, or apparatus.

[0101] Finally, it should be noted that the above implementation modes are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned implementation modes, a person of ordinary skill in the art should understand that the technical solutions described in the aforementioned implementation modes can still be modified, or some or all of the technical features therein can be replaced by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the implementation modes of the present application.

Claims

1. A battery, characterized in that: include: A housing having a storage space, the housing comprising a first plate, a second plate and a side plate, the first plate and the second plate being arranged opposite to each other, the side plate being arranged between the first plate and the second plate, and the first plate, the second plate and the side plate enclosing the storage space; A battery cell is arranged in the accommodation space; the battery cell comprises a first pole piece and a second pole piece, and the first pole piece and the second pole piece have different polarities; An elastic conductive member is arranged on the side plate and located in the accommodating space, a first end of the elastic conductive member is connected to the shell, and a connecting portion is arranged at a second end of the elastic conductive member.

2. The battery according to claim 1, characterized in that The battery further includes a limiting member, which is disposed in the accommodating space and located at the second end of the elastic conductive member.

3. The battery according to claim 2, characterized in that The limiting member includes adhesive, and the adhesive is used to bond the second end of the elastic conductive member and the shell.

4. The battery according to claim 3, characterized in that The adhesive wraps the connecting portion; and / or, The adhesive has an overlap region that overlaps with the elastic conductive member, and a ratio of a length D1 of the overlap region in an extension direction of the elastic conductive member to a length D2 of the elastic conductive member is between 0.1 and 0.

3.

5. The battery according to claim 2, characterized in that The elastic conductive member comprises a spring sheet, a first end of the spring sheet is connected to the housing, a second end of the spring sheet is limited to the limiting member, and the connecting portion is arranged at the second end of the spring sheet; and / or, The connecting portion includes a puncture needle, and the tip of the puncture needle faces the battery core.

6. The battery according to any one of claims 1 to 5, characterized in that The side plate is also provided with a pressure relief valve, and the notch of the pressure relief valve does not overlap with the elastic conductive member.

7. The battery according to claim 5, characterized in that The limiting member includes a convex portion provided on the first plate body and / or the second plate body, and the convex portion is located between the elastic conductive member and the battery core.

8. The battery according to claim 7, characterized in that The side panels include a first side panel and a second side panel that are spaced apart from each other, and a third side panel and a fourth side panel that are spaced apart from each other. The first side panel comprises a first panel segment, a second panel segment and a third panel segment, a first end of the second panel segment is connected to the first panel segment and is arranged at an angle to the first panel segment, a second end of the second panel segment is connected to the third panel segment and is arranged at an angle to the third panel segment, and a distance H1 between the third panel segment and the second side panel is smaller than a distance H2 between the first panel segment and the second side panel; The first end of the elastic conductive member is connected to the second plate segment, and the second end of the elastic conductive member is arranged in close contact with the connection between the second plate segment and the third plate segment.

9. The battery according to claim 8, characterized in that An arc transition plate is provided between the second plate segment and the third plate segment, and the second end of the elastic conductive member is arranged in close contact with the arc transition plate.

10. The battery according to claim 9, characterized in that There is a predetermined distance L1 between the connecting portion and the end surface of the second end of the elastic conductive member, and the predetermined distance L1 and the length L2 of the arc transition plate satisfy: 1 / 3≤L1: L2≤2 / 3.

11. The battery according to any one of claims 1 to 3, characterized in that The distance between the connecting portion and the battery core is greater than or equal to 0.5 mm; And / or, the first end of the elastic conductive member is welded to the shell to form a weld mark, and the battery further comprises a protective adhesive tape, which is attached to the surface of the elastic conductive member facing the battery cell and covers the weld mark; And / or, an electrode structure is provided on the side plate, an insulating member is provided between the battery cell and the electrode structure, the battery cell includes a battery cell body and a pole piece provided on the battery cell body, the pole piece is connected to the electrode structure through the insulating member, and the first end of the elastic conductive member does not extend beyond the top surface of the battery cell body close to the electrode structure.

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