Battery

Abstract

The utility model discloses a battery which comprises an outer shell assembly, a battery cover assembly and a battery cover assembly, the outer shell assembly comprises a bottom shell and a cover plate, the bottom shell comprises an opening, and the cover plate covers the opening; a first tab and a second tab are arranged at one end, in the first direction, of the battery cell, the first tab and the second tab are spaced in the second direction, the polarities of the first tab and the second tab are opposite, the first tab is electrically connected with the bottom shell, and the second tab is insulated from the shell assembly; the short circuit protection assembly comprises a first protection piece and a second protection piece, the first protection piece is connected with the cover plate and electrically connected with the first tab, and the second protection piece is electrically connected with the second tab; in the second direction, the first protection piece is located on the side, facing the second tab, of the first tab, the second protection piece is located on the side, facing the first tab, of the second tab, and a gap is formed between the first protection piece and the second protection piece. According to the battery disclosed by the utility model, the safety of the battery can be improved.

Description

Technical Field

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

[0002] With the development of new energy technologies, batteries such as lithium-ion batteries are also widely used in fields such as automobiles, mobile phones, drones, and power tools.

[0003] During the operation of the battery, phenomena such as overcharging or high temperature may occur, resulting in abnormal chemical reactions inside the battery, generating a large amount of gas inside the battery. Since the gas cannot be discharged, it may cause the battery to bulge, catch fire, or explode, causing serious safety problems. Summary of the Utility Model

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art. For this purpose, the object of the utility model is to provide a battery. When a large amount of gas is generated inside the battery, the outer shell assembly expands, causing the first protection member and the second protection member of the short-circuit protection assembly to conduct, realizing a short circuit inside the battery, rapidly reducing the voltage of the battery, and no longer generating gas inside the battery, thereby avoiding further expansion of the battery and improving the safety of the battery.

[0005] The utility model provides a battery, comprising: an outer shell assembly including a bottom shell and a cover plate, the bottom shell including an opening, and the cover plate covering the opening; an electric core, one end of the electric core in the first direction being provided with a first pole ear and a second pole ear, the first pole ear and the second pole ear being spaced apart in the second direction, the polarities of the first pole ear and the second pole ear being opposite, the first pole ear being electrically connected to the bottom shell, and the second pole ear being insulated from the outer shell assembly; a short-circuit protection assembly including a first protection member and a second protection member, wherein the first protection member is connected to the cover plate and electrically connected to the first pole ear, and the second protection member is electrically connected to the second pole ear;

[0006] In the second direction, the first protection member is located on the side of the first pole ear facing the second pole ear, the second protection member is located on the side of the second pole ear facing the first pole ear, and there is a gap between the first protection member and the second protection member.

[0007] The battery of the present utility model is connected and cooperated between the housing assembly and the short-circuit protection assembly. When the battery has abnormal conditions such as overcharging or high temperature, a large amount of gas is generated inside the battery, causing the housing assembly to expand. When the housing assembly expands and deforms, the short-circuit protection assembly conducts electricity between the first protection member and the second protection member, achieving a short circuit inside the battery, rapidly decreasing the voltage of the battery, no longer having an electrochemical reaction inside the battery, no longer generating gas, blocking the continuous occurrence of abnormal conditions of the battery, avoiding continuous expansion of the battery, and even explosion, thereby improving the safety of the battery.

[0008] In some embodiments, the bottom case includes a bottom plate opposite to the opening. Both the first ear and the first protection member are welded to the bottom plate. The battery further includes a pad, which is fixedly arranged on the bottom plate. The pad is insulated from the housing assembly. Both the second ear and the second protection member are welded to the pad.

[0009] According to some embodiments of the present utility model, the projection of the first protection member in the reference plane and the projection of the second protection member in the reference plane partially overlap, and the reference plane is perpendicular to the third direction.

[0010] According to some embodiments of the present utility model, the first protection member and the second protection member are spaced apart along the third direction to form the gap.

[0011] According to some embodiments of the present utility model, the first protection member has a first end away from the second protection member along the second direction and a second end facing the second protection member. The first protection member includes a first welding portion and a deformation portion. The deformation portion is located on the side of the first welding portion along the second direction facing the second protection member. The gap is located between the deformation portion and the second protection member. The first welding portion is welded to the bottom plate, and the deformation portion is connected to the cover plate.

[0012] According to some embodiments of the present utility model, the short-circuit protection assembly further includes a trigger member, which is fixedly connected to the cover plate and the first protection member respectively.

[0013] According to some embodiments of the present utility model, the trigger member is a metal member or a non-metal member.

[0014] According to some embodiments of the present utility model, the second protection member includes a second welding portion and a connecting portion. The second welding portion is welded to the pad, and the connecting portion extends beyond the pad along the second direction and extends towards the side of the first protection member.

[0015] According to some embodiments of the present utility model, it further includes: an insulating member, which is clamped between the pad and the bottom plate, and / or

[0016] An insulating protective glue, the insulating protective glue covers one side of the second tab and the second protective member facing the cover plate.

[0017] According to some embodiments of the present invention, the bottom plate includes a first placement portion and a second placement portion. The first placement portion and the second placement portion are distributed along the second direction. The second placement portion protrudes outward relative to the first placement portion toward the side away from the cover plate. The first tab and the first protective member are both disposed in the first placement portion. The pad is disposed in the second placement portion. One end of the pad away from the bottom plate along the third direction extends beyond the first placement portion. The second tab and the second protective member are both located on the side of the pad along the third direction facing away from the bottom plate.

[0018] In some embodiments, the first protective member, the first tab, the second protective member, and the second tab all have a cross-section intercepted along a reference cross-section. The reference cross-section is determined by the first direction and the third direction. Among them, the cross-sectional area of the first protective member is greater than the cross-sectional area of the first tab, and the cross-sectional area of the second protective member is greater than the cross-sectional area of the second tab.

[0019] Additional aspects and advantages of the present invention will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present invention. Description of the Drawings

[0020] The above and / or additional aspects and advantages of the present invention will become apparent and be readily understood from the description of the embodiments in conjunction with the following drawings, wherein:

[0021] Figure 1 is an exploded structural schematic diagram of a battery according to an embodiment of the present invention;

[0022] Figure 2 is Figure 1 an enlarged structural schematic diagram of part A in

[0023] Figure 3 is a structural schematic diagram of a short-circuit protection component of a battery according to an embodiment of the present invention;

[0024] Figure 4 is a state diagram of a battery in normal use according to an embodiment of the present invention;

[0025] Figure 5 is a state diagram of the expansion of the outer shell component of the battery according to an embodiment of the present invention driving the short-circuit protection component to conduct the first tab and the second tab.

[0026] Reference Signs:

[0027] 100 - Battery;

[0028] 110 - Outer shell assembly; 111 - Bottom shell; 1111 - Bottom plate; 1111a - First placement part; 1111b - Second placement part; 112 - Cover plate;

[0029] 120 - Battery cell; 121 - First tab; 122 - Second tab;

[0030] 130 - Short - circuit protection assembly; 131 - First protection part; 131a - First welding part; 131b - Deformation part; 132 - Second protection part; 132a - Second welding part; 132b - Connection part;

[0031] 140 - Pad;

[0032] 150 - Trigger part;

[0033] 160 - Insulating part;

[0034] 170 - Insulating protection glue. Detailed implementation mode

[0035] The embodiments of the present utility model will be described in detail below. The examples of the described embodiments are shown in the accompanying drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions from beginning to end. The embodiments described below by referring to the accompanying drawings are exemplary and are only used to explain the present utility model and should not be construed as a limitation to the present utility model.

[0036] With the development of new energy technologies, batteries such as lithium - ion batteries are also widely used in fields such as automobiles, mobile phones, drones, and power tools. During the operation of the battery, phenomena such as overcharging or high temperature may occur, resulting in abnormal chemical reactions inside the battery, generating a large amount of gas inside the battery. Since the gas cannot be discharged, it will further cause the battery to bulge, burn, and explode, resulting in serious safety problems.

[0037] In view of this, the present utility model provides a battery. When the battery experiences overcharging or abnormal heating, the outer shell assembly expands, causing the first protection part and the second protection part of the short - circuit protection assembly to conduct, achieving a short - circuit inside the battery, rapidly decreasing the voltage of the battery, avoiding overheating of the battery, generating an explosion, and improving the safety of the battery.

[0038] Next, referring to Figures 1 to 5 , a battery 100 according to the first - aspect embodiment of the present utility model will be described. The battery 100 can be a lithium - ion battery, a sodium - ion battery, or other types of batteries. The battery 100 can include an outer shell assembly 110, a battery cell 120, and a short - circuit protection assembly 130.

[0039] The housing assembly 110 can be used to encapsulate the battery cell 120 and protect the battery cell 120. The housing assembly 110 can include a bottom case 111 and a cover plate 112. The bottom case 111 can be a housing with an opening at one end (e.g., the top end). In this way, the battery cell 120 is encapsulated into the bottom case 111 through the opening, and the cover plate 112 is sealed at the opening to encapsulate the battery cell 120.

[0040] The battery cell 120 is encapsulated within the housing assembly 110. One end of the battery cell 120 along a first direction (e.g., Figure 1 the X direction shown in the figure) is provided with a first tab 121 and a second tab 122. The first tab 121 and the second tab 122 can be spaced along a second direction (e.g., Figure 1 the Y direction shown in the figure), and the polarities of the first tab 121 and the second tab 122 are opposite. For example, the first tab 121 can be a positive tab, and the second tab 122 can be a negative tab, or alternatively, the first tab 121 can be a negative tab and the second tab 122 can be a positive tab.

[0041] Among them, the first tab 121 can include a first flexible tab extending from the end of the battery cell 120 and a first rigid tab connected to the first flexible tab. The first rigid tab of the first tab 121 is electrically connected to the bottom case 111. The second tab 122 can include a second flexible tab extending from the battery cell 120 and a second rigid tab connected to the second flexible tab. The second rigid tab of the second tab 122 is insulated from the housing assembly 110. In this embodiment, the first tab 121 can be used as the negative tab, and the second tab 122 can be used as the positive tab. In this way, when the battery 100 of this embodiment is in use, the negative electrode of the circuit of the electrical appliance can be directly electrically connected to the housing assembly 110, and the positive electrode can be directly connected to the second tab 122, enabling the battery 100 to supply electrical energy to the electrical appliance.

[0042] Optionally, the battery cell may include a first electrode tab, a separator, and a second electrode tab that are stacked. Among them, the polarities of the first electrode tab and the second electrode tab are opposite. When the battery cell is a wound battery cell, after the first electrode tab, the separator, and the second electrode tab are stacked, they are wound around the winding axis; when the battery cell is a stacked battery cell, there may be multiple first electrode tabs, separators, and second electrode tabs. The first electrode tabs and the second electrode tabs are alternately stacked, and the separator is disposed between adjacent first electrode tabs and second electrode tabs. The first electrode tab may include a first current collector and a first active layer. The first current collector includes a first coating setting area and a first bare foil area. The first active layer is coated and disposed on the first coating setting area. The first bare foil area is the area on the first current collector where the first active layer is not provided. Among them, the first bare foil area may serve as a first sub-tab, and multiple first sub-tabs are stacked to form the first soft tab of the battery cell. The second electrode tab may include a second current collector and a second active layer. The second current collector includes a second coating setting area and a second bare foil area. The second active layer is coated and disposed on the second coating setting area. The second bare foil area is the area on the second current collector where the second active layer is not provided. Among them, the second bare foil area may serve as a second sub-tab, and multiple second sub-tabs are stacked to form the second soft tab of the battery cell.

[0043] The short-circuit protection component 130 may include a first protection member 131 and a second protection member 132. The first protection member 131 and the second protection member 132 are spaced apart along the second direction. The first protection member 131 is connected to the cover plate 112 and is also electrically connected to the first hard tab of the first electrode tab 121. The second protection member 132 is electrically connected to the second hard tab of the second electrode tab 122, and the second electrode tab 122 is insulated from the housing assembly 110.

[0044] In the second direction, the first protection member 131 is located on the side of the first electrode tab 121 facing the second electrode tab 122, and the second protection member 132 is located on the side of the second electrode tab 122 facing the first electrode tab 121. There is a gap between the first protection member 131 and the second protection member 132. When the battery 100 is in normal use, since there is a gap between the first protection member 131 and the second protection member 132, the first protection member 131 and the second protection member 132 are physically separated in space. When the battery 100 is in normal use, the first protection member 131 and the second protection member 132 are not electrically connected, avoiding a short circuit inside the battery 100 during normal use of the battery 100, thereby improving the safety of the battery 100 during use.

[0045] When abnormal conditions such as overcharging or high heat occur in the battery 100, resulting in a large amount of gas generated inside the battery 100, the outer shell assembly 110 expands under the action of the gas, causing the cover plate 112 to deform. During the deformation of the cover plate 112, the first protection member 131 is driven to move or deform, so that the first protection member 131 is electrically connected to the second protection member 132. For example, the electrical connection manner between the first protection member 131 and the second protection member 132 may be as follows: when there is a gap between the first protection member 131 and the second protection member 132, the deformation of the cover plate 112 drives the first protection member 131 and the second protection member 132 to move relatively to make them in contact and electrically connected; or, the deformation of the cover plate 112 drives the insulating bracket between the first protection member 131 and the second protection member 132 to move out between the first protection member 131 and the second protection member 132, so that the first protection member 131 and the second protection member 132 are in contact and electrically connected; or, the expansion of the outer shell assembly 110 causes relative movement between the first protection member 131 and the second protection member 132, so that the positions without insulating glue on the contact surfaces of the first protection member 131 and the second protection member 132 are in contact and electrically connected.

[0046] In the battery 100 of the present utility model, during normal use, the first protection member 131 and the second protection member 132 are not electrically connected, and the battery 100 can operate normally. However, when abnormal conditions such as overcharging or overheating occur, a large amount of gas is generated inside the battery 100. The gas causes the outer shell assembly 110 to expand and deform, making the first protection member 131 and the second protection member 132 electrically connected. At this time, the first ear 121, the bottom case 111, the first protection member 131, the second protection member 132, the second ear 122, and the battery cell 120 directly form a circuit, and the battery 100 has an internal short circuit. The voltage of the battery 100 drops rapidly, blocking further electrochemical reactions inside the battery 100, so that no more gas is generated inside the battery 100, avoiding the out-of-control explosion of the battery 100 and improving the safety of the battery 100 during use.

[0047] In some embodiments, the housing assembly 110 may be a steel structure member, and the bottom case 111 and the cover plate 112 may both be made of metal steel materials, such as stainless steel, carbon steel, or galvanized steel, etc., so that when a large amount of gas expands in the battery 100, the first tab 121 and the second tab 122 are conducted through the bottom case 111, the first protection member 131, and the second protection member 132, improving the reliability of the protection function of the short-circuit protection assembly 130. Among them, the bottom case 111 may be a steel case formed by stamping, having a certain structural strength, and the cover plate 112 may be a thin metal plate, making the housing assembly 110 convenient to process. At the same time, when a large amount of gas is generated in the battery 100, causing the housing assembly 110 to expand and deform, the deformation speed of the cover plate 112 is fast, reducing the time required for the first protection member 131 and the second protection member 132 to be conducted along with the deformation of the cover plate 112, having a fast response speed to abnormal conditions in the battery 100, timely blocking abnormal conditions, and thus improving the safety of the battery 100 during use.

[0048] Reference Figure 1 、 Figure 2 and Figure 3 In some embodiments, the bottom case 111 may include a bottom plate 1111 opposite to the opening, and both the first tab 121 and the first protection member 131 are welded to the bottom plate 1111. When the battery 100 has abnormal expansion, the first tab 121 is conducted with the first protection member 131 through the bottom plate 1111, and the current conduction area is large, improving the reliability of the electrical connection between the first tab 121 and the first protection member 131.

[0049] The battery 100 may further include a pad 140, and the pad 140 may be fixedly provided on the bottom plate 1111. Both the second tab 122 and the second protection member 132 are welded to the pad 140. The pad 140 provides a reliable electrical connection point, improving the reliability of the electrical connection between the second tab 122 and the second protection member 132. When the battery 100 is in use, when the positive electrode of the electrical appliance is electrically connected to the second tab 122, the wire of the positive electrode of the electrical appliance can be directly connected to the pad 140 by welding or other means, so that the current of the battery 100 can flow out from the second tab 122 to the electrical appliance. The pad 140 is insulated from the housing assembly 110, that is, the pad 140 and the bottom plate 1111 are insulated, for example, an insulating member is provided between the pad 140 and the bottom plate 1111. In this way, the pad 140 and the cover plate 112 are insulated from each other, thus avoiding a short circuit between the positive and negative electrodes of the battery cell. In other words, only when the battery 100 has abnormal expansion, the first protection member 131 and the second protection member 132 of the short-circuit protection assembly 130 will be conducted, improving the reliability of the short-circuit protection assembly 130.

[0050] Reference Figure 3 and Figure 4, Further, the bottom plate 1111 may include a first placement portion 1111a and a second placement portion 1111b distributed in the second direction. Both the first tab 121 and the first protection member 131 are provided in the first placement portion 1111a, providing an installation structure basis for the first tab 121 and the first protection member 131. The second placement portion 1111b protrudes outward from the first placement portion 1111a toward the side away from the cover plate 112. One end of the pad 140 away from the bottom plate 1111 in the third direction extends beyond the first placement portion 1111a. Both the second tab 122 and the second protection member 132 are located on the side of the pad 140 facing away from the bottom plate 1111 in the third direction. Wherein, the third direction may be the thickness direction of the main body of the battery cell 120, such as Figure 1 the Z direction shown in Figure 1 . In other words, the second placement portion 1111b may be a U-shaped groove structure formed by the bottom plate 1111 protruding outward in the Z direction in Figure 1 toward the side away from the cover plate 112, providing an installation space for the pad 140.

[0051] Continuing to refer to Figure 3 and Figure 4 , in some embodiments, the battery 100 may further include an insulating member 160. The insulating member 160 may be selected from insulating plastics or insulating rubbers. The insulating member 160 may be disposed in the second placement portion 1111b of the bottom plate 1111 and clamped between the pad 140 and the bottom plate 1111. In this way, the electrical connection between the pad 140 and the bottom plate 1111 is blocked by the insulating member 160, preventing the first tab 121 and the second tab 122 from directly conducting through the bottom plate 1111 and the pad 140, which is beneficial to improving the safety of the battery 100.

[0052] Referring to Figure 2 and Figure 3 , further, the battery 100 may further include an insulating protective adhesive 170. The insulating protective adhesive 170 covers the side of the second tab 122 and the second protection member 132 facing the cover plate 112, blocking the electrical connection between the second tab 122 and the second protection member 132 and the cover plate 112, and preventing the cover plate 112 from deforming due to external force and coming into contact and conduction with the second tab 122 or the second protection member 132, so that the second tab 122 directly conducts through the cover plate 112 and the bottom case 111 and the first tab 121, further improving the safety of the battery 100. In this way, the second tab 122 is insulated from the housing assembly 110 through the insulating member 160 and the insulating protective adhesive 170 respectively, preventing the second tab 122 from conducting with the first tab 121 through the housing assembly 110 during normal use of the battery.

[0053] Referring to Figure 3 , Figure 4 and Figure 5, According to some embodiments of the present utility model, the projection of the first protection member 131 in the reference plane and the projection of the second protection member 132 in the reference plane partially overlap, the reference plane is perpendicular to the third direction, and the third direction can be Figure 1 the Z direction shown in

[0054] . In this way, when the housing assembly 110 expands, the first protection member 131 and the second protection member 132 can undergo relative deformation along the third direction, and the overlapping part of the first protection member 131 and the second protection member 132 in the reference plane can be in contact conduction. The structure is simple, and the response is rapid after the housing assembly 110 deforms, thereby improving the safety during the use of the battery 100.

[0055] Refer to Figure 4 and Figure 5 , According to some embodiments of the present utility model, the first protection member 131 includes a first welding portion 131a away from the second protection member 132 and a deformation portion 131b. The first tab 121 is fixedly connected to the first placement portion 1111a of the bottom plate 1111 by laser welding, and the first welding portion 131a and the first placement portion 1111a of the bottom plate 1111 can also be fixedly connected by laser welding. In this way, the electrical connection between the first tab 121 and the first protection member 131 is realized.

[0056] The deformation portion 131b is located on the side of the first welding portion 131a along the second direction facing the second protection member 132, and the deformation portion 131b is connected to the cover plate 112. In the third direction, the above-mentioned gap is located between the deformation portion 131b and the second protection member 132. When the housing assembly 110 expands and deforms, the deformation portion 131b deforms with the cover plate 112 in the direction approaching the second protection member 132 and is in contact conduction with the second protection member 132. In this way, the reaction speed of the short-circuit protection assembly 130 to abnormal conditions in the battery 100 is improved, the conduction speed between the first protection member 131 and the second protection member 132 is fast, and the safety of the battery 100 is improved.

[0057] Continue to refer toFigure 4 and Figure 5 In some embodiments, the second protection member 132 may include a second welding portion 132a and a connecting portion 132b. The second welding portion 132a is laser welded to the pad 140. The connecting portion 132b extends beyond the pad 140 in the second direction and extends toward the first protection member 131, such that the connecting portion 132b and the deformed portion 131b are spaced apart in the third direction, and the above-mentioned gap is located between the connecting portion 132b and the deformed portion 131b. With this arrangement, it is ensured that the deformed portion 131b can come into contact and conduct with the connecting portion 132b of the second protection member 132 during the deformation of the cover plate 112, thereby improving the reliability of the short-circuit protection assembly 130.

[0058] Reference Figures 2 to 5 In some embodiments, the short-circuit protection assembly 130 may further include a trigger member 150. One end of the trigger member 150 is connected to the cover plate 112, and the other end is connected to the first protection member 131. Wherein, the connection position of the trigger member 150 and the first protection member 131 may be located between the deformed portion 131b and the first welding portion 131a, so that when the trigger member 150 applies a force to the first protection member 131, the deformed portion 131b is driven to deform toward the connecting portion 132b of the second protection member 132, so that the first protection member 131 and the second protection member 132 come into contact and conduct.

[0059] When the housing assembly 110 expands and deforms, the cover plate 112 applies a force toward the second protection member 132 to the first protection member 131 through the trigger member 150. In this embodiment, the structural strength of the bottom case 111 exceeds that of the cover plate 112. Therefore, the expansion and deformation of the housing assembly 110 first occur on the cover plate 112, that is, the cover plate 112 bulges outward away from the bottom case 111, and a force in the third direction away from the bottom case 111 is applied to the first protection member 131 through the trigger member 150, and the deformed portion 131b moves toward the connecting portion 132b under the force. When a large amount of gas is generated in the battery 100 to cause the housing assembly 110 to expand and deform, the cover plate 112 drives the deformed portion 131b to deform toward the second protection member 132 until it comes into contact and conducts with the connecting portion 132b, so that the first tab 121 and the second tab 122 are conducted, and the battery 100 has an internal short circuit, blocking the continuation of the abnormal situation. It is automatically triggered when an abnormality occurs in the battery 100. The short-circuit protection assembly 130 has a simple structure, deforms with the cover plate 112, has high reliability in conducting the first tab 121 and the second tab 122, and has a rapid response to block abnormal situations, making the battery 100 highly safe.

[0060] According to some embodiments of the present utility model, the trigger member 150 can be a metal member. For example, the trigger member 150 can be made of materials such as nickel or stainless steel, so that the trigger member 150 has good electrical conductivity. In this way, when the outer shell assembly 110 expands and the first protection member 131 and the second protection member 132 come into contact and conduct electricity, the first tab 121 can be conducted with the second tab 122 through the bottom case 111, the cover plate 112, the trigger member 150, the first protection member 131, the second protection member 132, and the pad 140. Thus, even if the connection between the first protection member 131 and the bottom case 111 fails, the first tab 121 and the second tab 122 can still be conducted, improving the reliability of the short-circuit protection assembly 130. Alternatively, the trigger member 150 can also be a non-metal member, such as ceramic or polypropylene (PP) and other materials. In this way, the battery 100 can be made lighter, reducing the production cost of the battery 100.

[0061] According to some embodiments of the present utility model, the connection manner in which the trigger member 150 is respectively connected to the cover plate 112 and the first protection member 131 can be a welding connection to ensure the reliability of the connection between the trigger member 150 and the cover plate 112 and the first protection member 131. Alternatively, the connection manner in which the trigger member 150 is respectively connected to the cover plate 112 and the first protection member 131 can also be a hot pressing connection. Compared with the trigger member 150 being connected to the cover plate 112 and the first protection member 131 by welding respectively, when using the hot pressing connection, no solder is required at the connection between the trigger member 150 and the cover plate 112 and the first protection member 131 respectively, reducing the material cost, and a smooth joint can be formed at the connection. In this way, the stress concentration formed at the connection can be reduced, improving the reliability of the connection between the trigger member 150 and the cover plate 112 and the first protection member 131.

[0062] In some embodiments, the first protection member 131, the first tab 121, the second protection member 132, and the second tab 122 all have cross-sections intercepted along a reference cross-section, and the reference cross-section is determined by a first direction and a third direction, as Figure 1As shown, the reference cross-section can be a plane parallel to the X-Z plane. Among them, the cross-sectional area of the first protective member 131 is larger than that of the first tab 121, the cross-sectional area of the second protective member 132 is larger than that of the second tab 122, and the first protective member 131, the second protective member 132, and the second tab 122 can all be made of the same material. In this way, by defining that the cross-sectional area of the first protective member 131 is larger than that of the first tab 121 and the cross-sectional area of the second protective member 132 is larger than that of the second tab 122, the resistance value of the first protective member 131 is greater than that of the first tab 121, and the resistance value of the second protective member 132 is greater than that of the second tab 122. When the first protective member 131 and the second protective member 132 are conducting, the first tab 121, the bottom case 111, the first protective member 131, the second protective member 132, the pad 140, the second tab 122, and the battery cell 120 directly form a loop. The voltage at the first protective member 131 and the second protective member 132 is high and the heat generation is large, so they burn out prior to the first tab 121 and the second tab 122, avoiding damage to the battery 100.

[0063] The principle of the battery 100 of the present utility model is as follows:

[0064] When the battery 100 is in normal use, the first protective member 131 and the second protective member 132 are not conducting, and the battery 100 can operate normally. When the battery 100 experiences abnormal conditions such as overcharging or overheating, a large amount of gas is generated inside the battery 100, causing the outer shell assembly 110 to expand and deform. The cover plate 112 protrudes away from the bottom case 111 in the third direction. By applying a force along the third direction away from the bottom case 111 to the first protective member 131 through the triggering member 150, the deformed portion 131b deforms towards the connecting portion 132b of the second protective member 132 and contacts the connecting portion 132b, thereby making the first protective member 131 and the second protective member 132 conduct. At this time, the first tab 121, the bottom case 111, the first protective member 131, the second protective member 132, the pad 140, the second tab 122, and the battery cell 120 directly form a loop, and the battery 100 undergoes an internal short circuit connection. The voltage of the battery 100 drops rapidly, preventing further electrochemical reactions from occurring inside the battery 100, blocking the continuation of the abnormal conditions of the battery 100, no more gas is generated inside the battery 100, and the battery 100 no longer expands.

[0065] In a second aspect of the present utility model, an electronic device is provided. The electronic device may include a receiving compartment and the above-mentioned battery 100. The above-mentioned battery 100 is disposed within the receiving compartment. The positive electrode of the circuit of the electronic device may be connected to the pad 140 of the battery 100, and the negative electrode is connected to the bottom case 111 of the battery 100. In this way, the battery 100 supplies power to the electronic device. Since the above-mentioned battery 100 is used, in case of an abnormal situation, an automatic short circuit occurs inside the battery 100, blocking the continuation of the abnormal situation of the battery, making the electronic device safer during use.

[0066] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present utility model.

[0067] In the description of the present utility model, the "first feature" and "second feature" may include one or more of such features.

[0068] In the description of the present utility model, the meaning of "a plurality" is two or more.

[0069] In the description of the present utility model, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through additional features therebetween.

[0070] In the description of the present utility model, the first feature being "above", "over" and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the horizontal height of the first feature is higher than that of the second feature.

[0071] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0072] Although embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present utility model. The scope of the present utility model is defined by the claims and their equivalents.

Claims

1. A battery (100), characterized in that, Comprising: A housing assembly (110), including a bottom shell (111) and a cover plate (112), the bottom shell (111) includes an opening, and the cover plate (112) covers the opening; A battery cell (120), one end of the battery cell (120) along a first direction is provided with a first tab (121) and a second tab (122), the first tab (121) and the second tab (122) are spaced apart along a second direction, the polarities of the first tab (121) and the second tab (122) are opposite, the first tab (121) is electrically connected to the bottom shell (111), and the second tab (122) is insulated from the housing assembly (110); A short - circuit protection assembly (130), the short - circuit protection assembly (130) includes a first protection member (131) and a second protection member (132), wherein, the first protection member (131) is connected to the cover plate (112) and electrically connected to the first tab (121), and the second protection member (132) is electrically connected to the second tab (122); In the second direction, the first protection member (131) is located on a side of the first tab (121) facing the second tab (122), the second protection member (132) is located on a side of the second tab (122) facing the first tab (121), and there is a gap between the first protection member (131) and the second protection member (132).

2. The battery (100) according to claim 1, characterized in that, The bottom shell (111) includes a bottom plate (1111) opposite to the opening, and both the first tab (121) and the first protection member (131) are welded to the bottom plate (1111), The battery (100) further includes a pad (140), the pad (140) is fixedly arranged on the bottom plate (1111), the pad (140) is in insulating cooperation with the housing assembly (110), and both the second tab (122) and the second protection member (132) are welded to the pad (140).

3. The battery (100) according to claim 2, wherein, The projection of the first protection member (131) in a reference plane and the projection of the second protection member (132) in the reference plane partially overlap, and the reference plane is perpendicular to a third direction.

4. The battery (100) according to claim 3, characterized in that, The first protection member (131) and the second protection member (132) are spaced apart along the third direction to form the gap.

5. The battery (100) according to claim 4, characterized in that, The first protection member (131) includes a first welding portion (131a) and a deformation portion (131b), the deformation portion (131b) is located on a side of the first welding portion (131a) along the second direction facing the second protection member (132), and the gap is located between the deformation portion (131b) and the second protection member (132), The first welding portion (131a) is welded to the bottom plate (1111), and the deformation portion (131b) is connected to the cover plate (112).

6. The battery (100) according to any one of claims 1-5, characterized in that, The short - circuit protection assembly (130) further includes a trigger member (150), and the trigger member (150) is fixedly connected to the cover plate (112) and the first protection member (131) respectively.

7. The battery (100) according to claim 6, characterized in that, The trigger member (150) is a metal member or a non-metal member.

8. The battery (100) according to claim 2, characterized in that, The second protection member (132) includes a second welding portion (132a) and a connecting portion (132b). The second welding portion (132a) is welded to the pad (140), and the connecting portion (132b) extends beyond the pad (140) along the second direction and extends toward the first protection member (131).

9. The battery (100) according to claim 8, wherein, Further included are: An insulating member (160) which is clamped between the pad (140) and the bottom plate (1111); and / or, An insulating protective adhesive (170) which covers the side of the second tab (122) and the second protection member (132) facing the cover plate (112).

10. The battery (100) according to claim 8, characterized in that, The bottom plate (1111) includes a first placement portion (1111a) and a second placement portion (1111b). The first placement portion (1111a) and the second placement portion (1111b) are distributed along the second direction. The second placement portion (1111b) protrudes outward relative to the first placement portion (1111a) toward the side away from the cover plate (112). Both the first tab (121) and the first protection member (131) are provided on the first placement portion (1111a). The pad (140) is provided on the second placement portion (1111b). One end of the pad (140) away from the bottom plate (1111) along the third direction extends beyond the first placement portion (1111a). Both the second tab (122) and the second protection member (132) are located on the side of the pad (140) along the third direction facing away from the bottom plate (1111).

11. The battery (100) according to claim 1, characterized in that, The first protection member (131), the first tab (121), the second protection member (132), and the second tab (122) all have cross-sections taken along a reference cross-section. The reference cross-section is determined by the first direction and the third direction. Among them, the cross-sectional area of the first protection member (131) is larger than the cross-sectional area of the first tab (121), and the cross-sectional area of the second protection member (132) is larger than the cross-sectional area of the second tab (122).

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