Battery

Abstract

The invention relates to the technical field of batteries, in particular to a battery. The at least one battery cell is arranged along the first direction, the battery cell comprises a battery cell body and at least one tab, the tab comprises a first connecting section, a middle section and a second connecting section, the first connecting section is connected to the battery cell body, the second connecting section is connected to the connecting plate, and the middle section is connected with the first connecting section and the second connecting section; and the reinforcing parts are positioned on the battery cells at the two ends in the first direction, and cover the surfaces of the middle sections of the at least one tab on the battery cells. The risk of tab breakage is reduced, and the tensile strength of the tab is improved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of batteries, in particular to a battery. BACKGROUND

[0002] With the rapid development of new energy vehicles, energy storage systems and portable electronic devices, soft package lithium ion batteries have become one of the mainstream power battery technologies due to their high energy density, lightweight, customizable shape and other advantages. Especially in small power battery applications, the battery needs to frequently undergo complex working conditions such as severe vibration, drop impact and temperature cycling, which puts higher requirements on the reliability of the battery structure.

[0003] In the process of conceiving and implementing the present application, the applicant found that at least the following problems exist: the tab of the soft package battery cell is a key current output conductive component, and the cell tab is usually bent in the whole battery, and stress concentration exists in the bending area of the tab, especially under repeated vibration or drop impact, which is prone to fatigue fracture.

[0004] The foregoing narrative is intended to provide general background information and does not necessarily constitute the prior art. SUMMARY

[0005] The main purpose of the present application is to provide a battery that reduces the risk of tab fracture and improves the tensile strength of the tab.

[0006] To achieve the above-mentioned purpose, the present application provides a battery, comprising: a connecting plate;

[0007] At least one battery cell arranged along a first direction, the battery cell comprising a battery cell body and at least one tab, the tab comprising a first connecting section, an intermediate section and a second connecting section, the first connecting section being connected to the battery cell body, the second connecting section being connected to the connecting plate, and the intermediate section connecting the first connecting section and the second connecting section;

[0008] A reinforcing member is located on the battery cell at both ends along the first direction, and the reinforcing member covers the surface of the intermediate section of the at least one tab on the battery cell.

[0009] The beneficial effects of the present application are: by arranging the reinforcing member on the surface of the intermediate section of the tab, a locally enhanced protective structure is formed, which can effectively disperse and absorb the stress generated during vibration and drop, greatly relieving the stress concentration phenomenon of the tab, thereby reducing the risk of tab fracture and improving the tensile strength of the tab.

[0010] On the basis of the above technical solution, the present application can also be improved as follows.

[0011] In some optional embodiments, the at least one battery cell comprises at least three battery cells arranged in a stack, and the battery cells comprise a first battery cell and a second battery cell at two ends, and at least one third battery cell between the first battery cell and the second battery cell;

[0012] The reinforcing member is arranged on the first battery cell and the second battery cell, and is not arranged on the third battery cell.

[0013] The technical scheme has the following advantages or beneficial effects: such a design focuses on the most complex stress condition of the tabs of the first battery cell and the second battery cell in the stacked module, optimizes the material cost and protection efficiency, and improves the heat dissipation capacity of the battery cell.

[0014] In some optional embodiments, the tab further comprises a bending section connected between the second connecting section and the intermediate section, and part of the reinforcing member covers the bending section.

[0015] The technical scheme has the following advantages or beneficial effects: this enables the reinforcing member to directly protect the area with the most concentrated stress, and prevents fatigue fracture from the root.

[0016] In some optional embodiments, the battery further comprises a shell having a receiving cavity, and the connecting plate and the battery cell are located in the receiving cavity.

[0017] The intermediate section has a first surface, a side wall surface, and a second surface, the first surface faces one side of the shell, the second surface is away from the first surface, and the side wall surface is between the first surface and the second surface.

[0018] Part of the reinforcing member covers the first surface.

[0019] The technical scheme has the following advantages or beneficial effects: when the battery is subjected to external impact or extrusion, the shell is the first force-bearing component, and the first surface of the tab is the main stress surface that directly or indirectly interacts with the shell. Arranging the reinforcing member on the surface can most directly resist the impact force from the outside of the battery that may cause the tab to be extruded or sheared inward, and provide the most critical protection for the tab.

[0020] In some optional embodiments, the battery cell has a packaging member for packaging the battery cell body, and another part of the reinforcing member covers a top sealing edge of the packaging member; and / or,

[0021] The other part of the reinforcing member covers the side wall surface.

[0022] The technical scheme has the following advantages or beneficial effects: the edge of the tab is fully wrapped, more uniform stress support is provided, and the tensile strength of the entire tab is improved.

[0023] In some optional embodiments, another part of the reinforcing member covers the second surface, and the thickness of the reinforcing member located on the first surface is thicker than the thickness of the reinforcing member located on the second surface; and / or,

[0024] The ratio of the area of the reinforcing member located on the second surface to the area of the first surface is less than 80%.

[0025] The above technical solutions have the following advantages or beneficial effects: in the limited packaging space and material cost, the main reinforcing material is deployed on the first surface to maximize the protection performance; at the same time, the second surface with less stress is covered with a thin layer or not completely covered, which maximizes the reduction of the tab heat dissipation while ensuring certain overall reinforcement effect, and balances the mechanical reliability and thermal management performance.

[0026] In some optional embodiments, the tab includes a positive tab and a negative tab, and the tensile strength of the positive tab is less than the tensile strength of the negative tab.

[0027] The reinforcing member only covers the first surface of the positive tab.

[0028] The above technical solutions have the following advantages or beneficial effects: this avoids providing indiscriminate and possibly excessive protection for all tabs, and realizes targeted reinforcement of the weakest area in the entire current path with the lowest cost and process complexity.

[0029] In some optional embodiments, the battery further includes a temperature detector, which is arranged between the tabs of two adjacent battery cells and is used to detect the temperature of the battery cell.

[0030] The second surface is not provided with the reinforcing member.

[0031] The above technical solutions have the following advantages or beneficial effects: by retaining the exposed area of the second surface, direct contact between the tab and the temperature detector is ensured, and the integrity of the heat conduction path is maintained. This design improves mechanical protection while avoiding thermal management failure caused by the covering layer, further optimizing the temperature monitoring function of the battery.

[0032] In some optional embodiments, the reinforcing member includes one of a buffer elastic member and a cured glue.

[0033] The above technical solutions have the following advantages or beneficial effects: the material properties (such as flexibility) of the reinforcing member can adapt to the slight deformation of the tab during charging and discharging, preventing the loss of protection function due to material embrittlement and cracking. Through the above structural design, this scheme improves the mechanical reliability of the tab while considering the thermal management and temperature measurement accuracy requirements, realizing the coordinated optimization of the battery structure performance.

[0034] In some embodiments, the reinforcing member (in particular, liquid curing adhesive) can be precisely coated on the tab through processes such as dispensing, spraying, etc., and is suitable for tab designs of different sizes and different bending angles. This process is easy to integrate into existing battery module automated assembly production lines, has high production efficiency and good consistency.

[0035] In some optional embodiments, the reinforcing member is a curing adhesive, the curing adhesive has a thermal conductivity k, and k≥1.2 W / (m·K); and / or,

[0036] The curing adhesive includes at least one of modified epoxy resin and silica gel.

[0037] The above technical solution has the following advantages or beneficial effects: the curing adhesive has a certain thermal conductivity (usually≥1.2 W / (m·K)), which is to ensure that the mechanical protection is provided while not blocking the dissipation path of the Joule heat generated when the current passes through the tab, and to avoid the accumulation of heat in the tab to cause temperature rise, thereby balancing the mechanical reliability and electrical / thermal safety.

[0038] The battery provided by the application comprises a connecting plate, at least one battery cell arranged along a first direction, the battery cell comprising a battery cell body and at least one tab, the tab comprising a first connecting section, an intermediate section, and a second connecting section, the first connecting section being connected to the battery cell body, the second connecting section being connected to the connecting plate, and the intermediate section connecting the first connecting section and the second connecting section; and a reinforcing member arranged on the battery cell at both ends along the first direction, and covering the surface of the intermediate section of the at least one tab on the battery cell.

[0039] By arranging the reinforcing member on the surface of the intermediate section of the tab, a locally reinforced protection structure is formed, which can effectively disperse and absorb the stress generated during vibration and falling, greatly relieving the stress concentration phenomenon of the tab, thereby reducing the risk of tab rupture and improving the tensile strength of the tab. BRIEF DESCRIPTION OF DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description. Obviously, the drawings in the following description are some embodiments of the application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0041] Figure 1 The structural schematic diagram of the first battery cell group in the battery provided by the embodiment of the application is shown in the following figure.

[0042] Figure 2 The structural schematic diagram of the second battery cell group in the battery provided by the embodiment of the application is shown in the following figure. Figure 1 The local explosion schematic diagram at I in the above figure is shown in the following figure.

[0043] Figure 3An explosion schematic of a battery provided by an embodiment of the present application;

[0044] Figure 4 An explosion schematic of a cell group in a battery provided by an embodiment of the present application;

[0045] Figure 5 A structure schematic of a second cell group in a battery provided by an embodiment of the present application;

[0046] Figure 6 A structure schematic of a third cell group in a battery provided by an embodiment of the present application; Figure 5 A partial explosion schematic of II in the middle;

[0047] Figure 7 A structure schematic of a fourth cell group in a battery provided by an embodiment of the present application;

[0048] Figure 8 A partial explosion schematic of III in the middle; Figure 7

[0049] A partial explosion schematic of IV in the middle; Figure 9

[0050] A structure schematic of a fourth cell group in a battery provided by an embodiment of the present application; Figure 10 Figure 9 A partial explosion schematic of V in the middle;

[0051] Figure 11 An assembly schematic of a temperature detector and a cell group in a battery provided by an embodiment of the present application;

[0052] Figure 12 An assembly schematic of a temperature detector and a connecting plate in a battery provided by an embodiment of the present application. Figure 11

[0053] An assembly schematic of a temperature detector and a connecting plate in a battery provided by an embodiment of the present application. Figure 13 BRIEF DESCRIPTION OF THE DRAWINGS

[0054] 100 - battery;

[0055] 110 - shell;

[0056] 111 - upper cover;

[0057] 112 - lower cover;

[0058] 120 - cell;

[0059] 121 - cell body;

[0060] 122 - tab;

[0061] 1221 - first connecting section;

[0062] 1222 - second connecting section;​

[0063] 1222 - Middle Section;

[0064] 1222a - First surface;

[0065] 1222b - Sidewall surface;

[0066] 1222c - Second surface;

[0067] 1223 - Second connecting segment;

[0068] 1224-bending section;

[0069] 1225 - Positive electrode;

[0070] 1226 - Negative electrode ear;

[0071] 123 - Package;

[0072] 130 - Connecting plate;

[0073] 140 - Reinforcing component;

[0074] 150 - Temperature detector;

[0075] 160 - First adhesive component;

[0076] 170 - Binding tape;

[0077] 180 - Second adhesive component;

[0078] 190-foam. Detailed Implementation

[0079] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. All other obtained embodiments are within the scope of protection of this application. In the absence of conflict, the following embodiments and features can be combined with each other.

[0080] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0081] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0082] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0083] With the rapid development of new energy vehicles, energy storage systems, and portable electronic devices, pouch lithium-ion batteries have become one of the mainstream power battery technologies due to their advantages such as high energy density, lightweight design, and customizable form factor. Especially in small power battery applications, batteries need to frequently undergo complex operating conditions, such as severe vibration, drop impact, and temperature cycling, which places higher demands on the reliability of the battery structure.

[0084] The tabs of the pouch cell are key conductive components for current output. The tabs of the cell are usually bent in the whole battery pack. Stress concentration occurs in the bending area of ​​the tabs, which are prone to fatigue fracture, especially under repeated vibration or drop impact.

[0085] In order to overcome the defects in the prior art, the battery provided in this application forms a locally enhanced protective structure by setting a reinforcing member on the surface of the middle section of the electrode tab. This can effectively disperse and absorb the stress generated by vibration and drop, greatly alleviate the stress concentration phenomenon in the bending area, thereby reducing the risk of electrode tab breakage and improving the tensile strength of the electrode tab.

[0086] The contents of this application will now be described in detail with reference to the accompanying drawings, so that those skilled in the art can have a clearer and more detailed understanding of the contents of this application.

[0087] Figure 1 This is a schematic diagram of the structure of the first type of battery cell pack provided in the embodiments of this application. Figure 2 for Figure 1 A schematic diagram of a localized explosion at point I in the middle.

[0088] like Figure 1 and Figure 2 As shown, this application provides a battery 100, including: a connecting plate 130;

[0089] At least one battery cell 120 is provided. The battery cell 120 is formed by winding / stacking a membrane shell (usually an aluminum-plastic membrane), an electrode assembly (usually a positive electrode, a separator, and a negative electrode) and an electrolyte. The membrane shell encapsulates the electrode assembly and the electrolyte to form the battery cell 120. The battery cell 120 is disposed along a first direction. The battery cell 120 includes a battery cell body 121 and at least one tab 122. The tab 122 includes a first connecting section 1221, an intermediate section 1222, and a second connecting section 1223. The first connecting section 1221 is connected to the battery cell body 121, the second connecting section 1223 is connected to a connecting plate 130, and the intermediate section 1222 connects the first connecting section 1221 and the second connecting section 1223.

[0090] A reinforcing member 140 is located on the battery cells 120 at both ends along the first direction, and the reinforcing member 140 covers the surface of the middle section 1222 of at least one tab 122 on the battery cell 120.

[0091] It should be noted that the connecting board 130 refers to the component used to connect the battery cell 120 to the external circuit, such as a BMS board, protection board, or adapter board.

[0092] It should be noted that cell 120 refers to the single-cell structure of the soft-pack lithium-ion battery 100, which includes the cell body 121 and the tabs 122.

[0093] It should be noted that tab 122 refers to the conductive component of cell 120, which is used for current output and is usually made of aluminum foil or copper foil.

[0094] It should be noted that the first connection segment 1221 refers to the part where the tab 122 connects to the battery cell body 121.

[0095] It should be noted that the intermediate section 1222 refers to the transition area in the tab 122 that connects the first connecting section 1221 and the second connecting section 1223, which is usually a bent structure.

[0096] It should be noted that the second connecting section 1223 refers to the part where the tab 122 connects to the connecting plate 130.

[0097] It should be noted that reinforcement 140 refers to the protective material covering the surface of tab 122, such as cured adhesive, cushioning elastic element or other malleable material.

[0098] The analysis is as follows: When the battery pack 100 faces a drop test, the tabs 122 will deform, compressing the tabs 122 of the outermost cells 120. The positive tab 1225 has lower tensile strength and is easily compressed by the deformed casing 110, causing the tab 122 to break. Therefore, the tab 122 facing the casing 110 needs to be reinforced with a reinforcing member 140 to increase its strength and prevent breakage.

[0099] Furthermore, when the battery pack 100 experiences an external impact (such as vibration or drop), the reinforcement 140 forms a physical barrier by covering the middle section 1222 of the tab 122 to disperse the stress concentration caused by the external force.

[0100] like Figure 1 As shown. It should be noted that when there is only one cell 120, the first direction is the thickness direction of the cell 120.

[0101] When there are at least two cells 120, the first direction is the stacking direction of the at least two cells 120.

[0102] Specifically, the reinforcing member 140 covers the middle section 1222 of the tab 122, forming a mechanical protective barrier, effectively dispersing stress concentration caused by external impact, thereby reducing the risk of breakage of the tab 122 under vibration and drop conditions.

[0103] The reinforcement 140 does not provide homogenized protection for all components of the battery 100 or all cells 120, but rather precisely strengthens the critical weak area 1222 in the middle section of the tab 122. This design stems from a deep understanding of the battery 100's failure modes, such as vibration and drop failures—under external mechanical loads, the middle section 1222 of the tab 122 has the lowest bending stiffness and is most prone to fatigue. Therefore, this solution achieves reinforcement of the weakest point with minimal structural and material costs, thereby significantly and efficiently improving the overall resistance to mechanical shock and vibration fatigue of the battery 100 module.

[0104] By covering the surface of the intermediate section 1222 with the reinforcing member 140, the local stiffness and flexural section modulus of this area are essentially increased. When the tab 122 bends due to vibration or impact, the reinforcing member 140 can effectively share and transfer stress, dispersing the stress that might otherwise be concentrated in the thin wall of the metal foil of the tab 122, thereby fundamentally inhibiting the propagation of microcracks and greatly reducing the risk of the tab 122 breaking in the intermediate section 1222.

[0105] By setting up the above-mentioned reinforcement 140 on the surface of the middle section 1222 of the tab 122, a locally reinforced protective structure is formed, which can effectively disperse and absorb the stress generated by vibration and drop, greatly alleviate the stress concentration phenomenon in the bending area, and thus minimize the risk of tab 122 breaking.

[0106] In some alternative embodiments, at least one cell 120 includes at least three cells 120 stacked together. Along a first direction, the cell 120 includes a first cell 120 and a second cell 120 located at both ends, and at least one third cell 120 located between the first cell 120 and the second cell 120.

[0107] The reinforcing member 140 is provided on the first battery cell 120 and the second battery cell 120, but the reinforcing member 140 is not provided on the third battery cell 120.

[0108] The above technical solution has the following advantages or beneficial effects: This design focuses on protecting the first cell 120 and the tab 122 of the second cell 120 in the stacked module where the stress is most complex, optimizes material cost and protection efficiency, and can also improve the heat dissipation capacity of the cell 120.

[0109] It should be noted that, according to mechanical analysis, the tabs 122 of the first and second battery cells 120 experience the greatest swing amplitude and force under vibration and impact. Therefore, in this embodiment, the reinforcing member 140 is selectively coated only on the tabs 122 of the first and second battery cells 120 (i.e., the two outermost cells 120), while the tabs 122 of the inner third battery cell 120 may be uncoated or only lightly protected. This saves materials and simplifies the process while ensuring the overall module's resistance to mechanical impact.

[0110] The purpose of this approach is to optimize cost-effectiveness and achieve intelligent protection. When the number of battery cells 120 is ≥3, reinforcement is specifically applied only to the two cells 120 located at the ends, i.e., the first and second cells 120, while the third cell 120 in the middle is not reinforced. This optimizes material costs and production time while ensuring that the overall mechanical reliability of the battery module is not reduced. It avoids excessive engineering and resource waste, and enhances the product's market competitiveness.

[0111] In some alternative embodiments, the tab 122 further includes a bent section 1224 connected between the second connecting section 1223 and the intermediate section 1222, with a portion of the reinforcement 140 covering the bent section 1224.

[0112] The above technical solution has the following advantages or beneficial effects: it enables the reinforcing member 140 to directly protect the area where stress is most concentrated, thus preventing fatigue fracture from the root.

[0113] It should be noted that the bending section 1224 refers to the bending area formed in the middle section 1222 of the tab 122 due to the connection between the battery cell body 121 and the connecting plate 130.

[0114] The analysis is as follows: The protection range is clearly extended from the middle section 1222 to the bending section 1224, which is the weakest point on the tab 122 where the geometric change is most drastic and the stress concentration effect is most significant. The reinforcing member 140 covers the bending section 1224, which is equivalent to directly adding a composite reinforcing layer to the stress peak area. This reinforcing layer not only suppresses the plastic accumulation caused by repeated bending at the bend, but also changes the local stress distribution, reducing the stress peak and making the distribution more uniform. The protective effect is more thorough and effective than simply covering the straight section.

[0115] In some embodiments, by applying adhesive, stress concentration at the bending point is avoided, which could cause the tab 122 to break due to stress concentration.

[0116] Therefore, the coverage area of ​​the reinforcing member 140 extends to the bending section 1224 of the tab 122. By covering the bending section 1224, stress concentration in this area is eliminated. When an external impact is applied to the bending section 1224, the reinforcing member 140 disperses stress and prevents the risk of breakage at the bend angle. Furthermore, this design improves the mechanical reliability of the tab 122 under complex operating conditions by extending the coverage area.

[0117] Figure 3 This is a schematic diagram of a battery explosion provided in an embodiment of this application. Figure 4 This is an exploded schematic diagram of the battery cell assembly provided in an embodiment of this application. Figure 5 This is a schematic diagram of the structure of the second type of battery cell pack provided in the embodiments of this application. Figure 6 forFigure 5 A schematic diagram of a partial explosion at point II. Figure 7 This is a schematic diagram of the structure of the third type of battery cell pack provided in the embodiments of this application. Figure 8 for Figure 7 A schematic diagram of a localized explosion at point III.

[0118] like Figures 3 to 8 As shown, in some optional embodiments, the battery 100 further includes a housing 110 having a receiving cavity, in which the connecting plate 130 and the battery cell 120 are both located;

[0119] The intermediate section 1222 has a first surface 1222a, a side wall surface 1222b and a second surface 1222c. The first surface 1222a faces the housing 110, the second surface 1222c faces away from the first surface 1222a, and the side wall surface 1222b is located between the first surface 1222a and the second surface 1222c.

[0120] Part of the reinforcement 140 covers the first surface 1222a.

[0121] The above technical solution has the following advantages or beneficial effects: When the battery 100 is subjected to external impact or compression, the casing 110 is the first load-bearing component, and the first surface 1222a of the tab 122 is the main force-bearing surface that interacts directly or indirectly with the casing 110. Providing a reinforcing member 140 on this surface can most directly resist impact forces from outside the battery 100 that may cause the tab 122 to be squeezed or sheared inwards, providing the most critical protection for the tab 122.

[0122] It should be noted that the first surface 1222a refers to the surface of the tab 122 facing the housing 110. When the battery 100 is subjected to an impact perpendicular to the wall of the housing 110, this area is subjected to significant force.

[0123] For example, tab 122 is on the plane outside of package 123.

[0124] The first surface 1222a refers to the surface of the tab 122 that is away from the housing 110, and the tab 122 is a plane inside the package 123.

[0125] Side wall surface 1222b: refers to the side surface that connects the first surface 1222a and the second surface 1222c.

[0126] It should be noted that the reinforcing member 140 covers the first surface 1222a of the middle section 1222 of the tab 122, and the coverage of the first surface 1222a restricts the deformation of the tab 122 in the direction of the package 123. This significantly improves the structural stability of the middle section 1222 and enhances its heat dissipation capability.

[0127] In some embodiments, the housing 110 may be a rectangular structure, and the size of the housing 110 may be greater than or equal to the size of the battery cell 120, so that the housing 110 can support the battery cell 120.

[0128] It is understandable that the purpose of the receiving cavity is to house the battery cell 120. It is easy to understand that the receiving cavity is sealed to prevent side reactions from occurring in the internal system of the battery cell 120, which would affect the performance of the battery cell 120.

[0129] For example, the size or shape of the receiving cavity is matched with the size and shape of the battery cell 120. Specifically, it can be adjusted according to the actual situation. This application embodiment does not impose too many restrictions here.

[0130] In this embodiment, the battery cell 120 can be configured as a rectangular structure. The battery cell 120 can be located inside the housing 110.

[0131] Understandably, the housing 110 can be used to support the battery cell 120.

[0132] The dimensions of the aforementioned housing 110 can be set according to actual needs, and this embodiment of the application does not impose any restrictions on them.

[0133] In addition, it should be noted that the shape of the housing 110 is not limited in this embodiment. For example, the housing 110 can be a regular shape such as a cuboid or a cylinder. Of course, the housing 110 can also be other irregular shapes.

[0134] In some embodiments, the housing 110 protects the battery cell 120 therein. The housing 110 may be composed of two parts joined together for easy installation. The housing 110 may be a metal shell. Specifically, the material of the housing 110 may be stainless steel, which is sturdy and corrosion-resistant. Of course, the housing 110 may also be made of other materials, and this embodiment does not impose any specific limitations on this.

[0135] In some embodiments, the housing 110 includes an upper cover 111 and a lower cover 112, which are engaged to form a receiving cavity.

[0136] In some embodiments, a first adhesive 160 is provided between two adjacent cells 120 to bond the two adjacent cells 120 together.

[0137] In some embodiments, after the two connected battery cells 120 are connected by the first adhesive 160, they are bundled together by the binding tape 170.

[0138] In some embodiments, the battery 100 further includes a second adhesive 180 for securing the cell 120 to the lower cover 112.

[0139] In some embodiments, the battery 100 also includes foam 190 located at the bottom of the housing 110.

[0140] Figure 9 This is a schematic diagram of the structure of the fourth type of battery cell pack provided in the embodiments of this application. Figure 10 for Figure 9 A schematic diagram of a localized explosion at point IV.

[0141] like Figure 9 and Figure 10 As shown, in some alternative embodiments, the cell 120 has a package 123 for encapsulating the cell body 121, and another portion of the reinforcing member 140 covers the top sealing edge of the package 123; and / or,

[0142] like Figure 7 and Figure 8 As shown, another part of the reinforcement 140 covers the side wall surface 1222b.

[0143] The above technical solution has the following advantages or beneficial effects: it achieves full wrapping of the edge of the tab 122, provides more uniform stress support, and improves the tensile strength of the entire tab 122.

[0144] It should be noted that the top sealing edge refers to the edge structure in the encapsulation component 123 used to seal the cell body 121.

[0145] In some embodiments, the reinforcing member 140 covers the first surface 1222a and the top sealing edge to prevent the aluminum-plastic film sealing edge from cracking, strengthen the structural strength of the top sealing edge, help anchor the reinforcing member 140 to the cell body 120, prevent it from falling off, and protect the top sealing area.

[0146] Specifically, the reinforcing member 140 extends to cover the top sealing edge of the cell 120, so that the reinforcing member 140 is not only attached to the tab 122, but also forms a firm bond with the body of the cell 120 (encapsulation 123). This prevents the reinforcing member 140 from peeling off or shifting from the root of the tab 122 under long-term vibration, ensuring the long-term effectiveness of the protection. At the same time, it also provides additional mechanical protection for the vulnerable top sealing edge area.

[0147] In other embodiments, the reinforcement 140 is designed to cover the first surface 1222a, the bent section 1224, and the top sealing edge, thereby enhancing the overall encapsulation strength of the cell 120 while protecting the bent area of ​​the tab 122. This design improves the mechanical reliability of the tab 122 under complex operating conditions by expanding the coverage area and prevents the risk of internal short circuits due to damage to the encapsulation 123.

[0148] Furthermore, the coverage area of ​​the reinforcing member 140 extends from the first surface 1222a to the bending section 1224 and then to the top sealing edge. By covering the bending section 1224, stress concentration in this area is eliminated, while covering the top sealing edge enhances the sealing strength. When an external impact is applied to the bending section 1224, the reinforcing member 140 disperses stress and prevents the risk of breakage at the bend corner; when an impact is applied to the top sealing edge, the reinforcing member 140 absorbs the impact energy, preventing the aluminum-plastic film sealing edge from cracking.

[0149] In some embodiments, the reinforcement 140 covers the first surface 1222a and the sidewall surface 1222b.

[0150] The reinforcing member 140 covers the first surface 1222a of the middle section 1222 of the tab 122, so that the stress can be evenly distributed through the cooperative coverage of the first surface 1222a and the side wall surface 1222b when an external force is applied. The coverage of the first surface 1222a restricts the deformation of the tab 122 in the direction of the package 123, while the coverage of the side wall surface 1222b prevents the bending section 1224 from breaking due to lateral stress.

[0151] By covering the first surface 1222a and the sidewall 1222b, the reinforcing member 140 can simultaneously limit the deformation and lateral stress of the tab 122 in the direction of the package 123, significantly improving the structural stability of the bending section 1224. Furthermore, the covering of the first surface 1222a and the package 123 form a synergistic protection, preventing additional stress on the tab 122 caused by deformation of the package 123, and improving the tensile strength of the entire tab 122.

[0152] In other embodiments, the reinforcement 140 covers the first surface 1222a, the bent section 1224, and the sidewall surface 1222b.

[0153] It should be noted that this configuration provides protection for more areas of the tab 122, while also avoiding unnecessary costs and impacting heat dissipation.

[0154] In other embodiments, the reinforcement 140 covers the first surface 1222a, the sidewall surface 1222b, and the top sealing edge.

[0155] Furthermore, covering the sidewall 1222b means that the reinforcement 140 encloses the tab 122 throughout its entire thickness. This significantly enhances the tab 122's resistance to lateral bending and torsional stiffness. The reinforcement 140 strengthens the overall package strength of the cell 120 while protecting the first surface 1222a and the sidewall 1222b. This design, by expanding the coverage area, improves the mechanical reliability of the tab 122 under complex operating conditions and prevents the risk of internal short circuits due to damage to the package 123.

[0156] In other embodiments, the reinforcement 140 covers the first surface 1222a, the bent section 1224, the side wall surface 1222b, and the top sealing edge.

[0157] It should be noted that the reinforcing member 140 enhances the overall encapsulation strength of the cell 120 while protecting the first surface 1222a, the bent section 1224, and the sidewall 1222b. This design improves the mechanical reliability of the tab 122 under complex operating conditions by expanding the coverage area and prevents the risk of internal short circuits due to damage to the encapsulation member 123. It also significantly improves the structural stability of the tab 122 and increases the overall tensile strength of the tab 122.

[0158] In some alternative embodiments, another portion of the reinforcement 140 covers the second surface 1222c, and the thickness of the reinforcement 140 located on the first surface 1222a is greater than the thickness of the reinforcement 140 located on the second surface 1222c; and / or,

[0159] The area of ​​the reinforcing member 140 located on the second surface 1222c is less than 80% of the area of ​​the first surface 1222a.

[0160] The above technical solution has the following advantages or beneficial effects: within the limited packaging space and material cost, the main reinforcing material is deployed on the first surface 1222a to maximize the protection performance; at the same time, the second surface 1222c, which is less stressed, is covered with a thin layer or not completely covered, so as to minimize heat dissipation to the tab 122 while ensuring a certain overall reinforcement effect, thus balancing mechanical reliability and thermal management performance.

[0161] Specifically, the difference can be made by the thickness of the reinforcing member 140 on the first surface 1222a and the thickness of the reinforcing member 140 on the second surface 1222c, wherein the thickness of the reinforcing member 140 on the first surface 1222a is greater than the thickness of the reinforcing member 140 on the second surface 1222c.

[0162] Here, thickness refers to the thickness of the reinforcing member 140 located on the first surface 1222a along the direction from the first surface 1222a to the second surface 1222c, and the thickness of the reinforcing member 140 located on the second surface 1222c.

[0163] Furthermore, this can also be reflected in the area covered. Specifically, the ratio of the area of ​​the reinforcing member 140 on the second surface 1222c to the area of ​​the second surface 1222c is less than 80%. In other words, the area covered by the reinforcing member 140 on the first surface 1222a is significantly larger than the area covered by the reinforcing member 140 on the second surface 1222c. This ensures the strength of the tab 122 and improves the overall tensile strength, while also reducing costs and improving heat dissipation.

[0164] In some alternative embodiments, the tab 122 includes a positive tab 1225 and a negative tab 1226, wherein the tensile strength of the positive tab 1225 is less than the tensile strength of the negative tab 1226.

[0165] The reinforcement 140 only covers the first surface 1222a of the positive electrode tab 1225.

[0166] The above technical solution has the following advantages or beneficial effects: it avoids providing indiscriminate and potentially excessive protection for all tabs 122, and achieves targeted reinforcement of the weakest area in the entire current path with the lowest cost and process complexity.

[0167] Specifically, since the positive tab 1225 of the soft-pack battery cell is generally an aluminum tab 122, while the negative tab 1226 is generally a copper tab 122, the tensile strength of the negative tab 1226 will be much higher than that of the positive tab 1225. Therefore, there will be two situations according to the design requirements.

[0168] In some embodiments, a reinforcement 140 is designed at the positive electrode tab 1225 to reinforce the positive electrode tab 1225. No reinforcement 140 is designed at the negative electrode tab 1226. The reinforcement 140 selectively covers only the first surface 1222a and / or the bent section 1224 of the positive electrode tab 1225, while the negative electrode tab 1226, which has higher mechanical strength, is not covered or has reduced coverage.

[0169] In other embodiments, reinforcement members 140 are provided at both the positive electrode tab 1225 and the negative electrode tab 1226 to reinforce both types of tabs 122 simultaneously.

[0170] Figure 11 This is a schematic diagram of the assembly of the temperature detector and the cell assembly in the battery provided in an embodiment of this application. Figure 12 for Figure 11 A schematic diagram of a localized explosion at point V. Figure 13 This is a schematic diagram of the assembly of the temperature detector and the connecting plate in the battery provided in an embodiment of this application.

[0171] like Figures 11 to 13As shown, in some optional embodiments, the battery 100 further includes a temperature detector 150, which is located between the tabs 122 of two adjacent cells 120 and is used to detect the temperature of the cells 120.

[0172] The second surface 1222c is not reinforced by a reinforcing member 140.

[0173] The above technical solution has the following advantages or beneficial effects: by retaining the exposed area of ​​the second surface 1222c, direct contact between the tab 122 and the temperature detector 150 is ensured, maintaining the integrity of the heat conduction path. This design improves mechanical protection while avoiding thermal management failure caused by the covering layer, further optimizing the temperature monitoring function of the battery 100.

[0174] In other words, the second surface 1222c is not covered by the reinforcing member 140, so that the second surface 1222c of the tab 122 remains exposed. The preservation of the exposed area ensures that the heat conduction path between the tab 122 and the detector is unobstructed, avoiding temperature monitoring errors caused by the covering layer blocking the path.

[0175] In some embodiments, the temperature detector 150 is soldered onto the pads of the connecting plate 130, making the temperature detector 150 and the connecting plate 130 an integral unit. Then, two different battery cells 120 are laser-welded together with the connecting plate 130 to form a battery pack 100 with charging and discharging functions. Subsequently, the soldered battery cell pack 120 is fixed together by stacking and shaping and the first adhesive 160. At this time, by stacking the battery cells 120, the tabs 122 are also shaped into a bent shape. Then, a layer of tape is wrapped around the outside of the stacked battery cell pack 120 for binding. Then, the temperature detector 150 is placed in the inner area of ​​the tabs 122 of the stacked battery 100. This is to ensure that the temperature detector 150 has sufficient buffer space and placement space, and can accurately and effectively monitor the temperature of the battery cell 120.

[0176] In some alternative embodiments, the reinforcement 140 includes either a cushioning elastic element or a curing adhesive.

[0177] The above technical solution has the following advantages or beneficial effects: the material properties (such as flexibility) of the reinforcing member 140 can adapt to the slight deformation of the tab 122 during charging and discharging, preventing loss of protective function due to material embrittlement and cracking. Through the above structural design, this solution improves the mechanical reliability of the tab 122 while taking into account the requirements of thermal management and temperature measurement accuracy, achieving synergistic optimization of the structural performance of the battery 100.

[0178] In some embodiments, the reinforcing member 140 (especially liquid-curing adhesive) can be precisely applied to the tab 122 through processes such as dispensing and spraying, adapting to tab 122 designs of different sizes and bending angles. This process is easily integrated into existing automated assembly lines for battery modules, resulting in high production efficiency and good consistency.

[0179] In some embodiments, the cushioning elastic element can be a silicone pad or a foamed polymer sheet. These elements can effectively absorb high-frequency vibration energy through elastic deformation.

[0180] In some embodiments, the curing adhesive can be epoxy or silicone.

[0181] The liquid adhesive can flow and fill all the microscopic unevenness and complex geometric contours on the surface of the tab 122 (especially the bending section 1224). After curing, it forms an integrated reinforcement layer with adaptive shape, high bonding strength and no interface gaps, resulting in a more thorough and reliable protective effect.

[0182] In some alternative embodiments, the reinforcing member 140 is a cured adhesive with a thermal conductivity k, and k ≥ 1.2 W / (m·K); and / or,

[0183] The curing adhesive includes at least one of modified epoxy resin and silicone.

[0184] The above technical solution has the following advantages or beneficial effects: the curing adhesive has a certain thermal conductivity (usually ≥1.2W / (m·K)) to ensure that while providing mechanical protection, it does not obstruct the dissipation path of Joule heat generated when current passes through the tab 122, thus avoiding the accumulation of heat in the tab 122 and causing the temperature to rise, thereby taking into account both mechanical reliability and electrical / thermal safety.

[0185] In some embodiments, the curing adhesive can be a modified epoxy resin or silicone. These materials typically offer a combination of high bond strength, a moderate modulus of elasticity (providing support while preventing brittleness), good environmental resistance (temperature and aging resistance), and processability (coatable and curable). This ensures the effectiveness and durability of the reinforcement 140 throughout the entire lifespan of the battery 100.

[0186] Its key performance parameters include: tensile strength ≥25MPa to ensure sufficient support strength; at the same time, its elongation at break should be moderate, so that it has a certain degree of flexibility rather than complete rigidity, so that it can absorb energy through micro-deformation under impact and avoid peeling off from tab 122 or cracking itself due to excessive brittleness.

[0187] In some embodiments, the curing adhesive can be a modified epoxy resin adhesive or silicone adhesive, with the addition of nano-alumina (Al2O3) or graphene filler to improve the thermal conductivity of the adhesive. Simultaneously, the adhesive exhibits good flexibility (elongation at break ≥150%) and tensile strength ≥2MPa, allowing it to adapt to the minute deformations of the tab 122 during charging and discharging, and providing excellent protection.

[0188] The battery provided in this application includes a connecting plate; at least one battery cell disposed along a first direction, the battery cell including a battery cell body and at least one electrode tab, the electrode tab including a first connecting segment, an intermediate segment and a second connecting segment, the first connecting segment being connected to the battery cell body, the second connecting segment being connected to the connecting plate, and the intermediate segment being connected to the first connecting segment and the second connecting segment; and a reinforcing member located on the battery cells at both ends along the first direction, and the reinforcing member covering the surface of the intermediate segment of at least one electrode tab on the battery cell.

[0189] By setting reinforcements on the surface of the middle section of the electrode lug, a locally reinforced protective structure is formed, which can effectively disperse and absorb the stress generated by vibration and drop, greatly alleviate the stress concentration phenomenon in the bending area, thereby reducing the risk of electrode lug breakage and improving the tensile strength of the electrode lug.

[0190] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0191] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0192] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A battery (100), characterized in that, include: Connecting plate (130); At least one battery cell (120) is provided extending along a first direction. The battery cell (120) includes a battery cell body (121) and at least one electrode (122). The electrode (122) includes a first connecting section (1221), an intermediate section (1222), and a second connecting section (1223). The first connecting section (1221) is connected to the battery cell body (121), the second connecting section (1223) is connected to the connecting plate (130), and the intermediate section (1222) connects the first connecting section (1221) and the second connecting section (1223). A reinforcing member (140) is located on the cells (120) at both ends along the first direction, and the reinforcing member (140) covers the surface of the middle section (1222) of at least one of the tabs (122) on the cells (120).

2. The battery (100) according to claim 1, characterized in that, The at least one battery cell (120) includes at least three battery cells (120) stacked together. Along the first direction, the battery cell (120) includes a first battery cell (120) and a second battery cell (120) located at both ends, and at least one third battery cell (120) located between the first battery cell (120) and the second battery cell (120). The reinforcing member (140) is provided on the first battery cell (120) and the second battery cell (120), and the reinforcing member (140) is not provided on the third battery cell (120).

3. The battery (100) according to claim 1, characterized in that, The tab (122) further includes a bent section (1224) connected between the second connecting section (1223) and the intermediate section (1222), and a portion of the reinforcing member (140) covers the bent section (1224).

4. The battery (100) according to any one of claims 1-3, characterized in that, The battery (100) also includes a housing (110) having a receiving cavity, wherein the connecting plate (130) and the battery cell (120) are both located within the receiving cavity; The intermediate section (1222) has a first surface (1222a), a side wall surface (1222b), and a second surface (1222c). The first surface (1222a) faces the side of the housing (110), the second surface (1222c) faces away from the first surface (1222a), and the side wall surface (1222b) is located between the first surface (1222a) and the second surface (1222c). Part of the reinforcement (140) covers the first surface (1222a).

5. The battery (100) according to claim 4, characterized in that, The battery cell (120) has a package (123) for encapsulating the battery cell body (121), and another portion of the reinforcing member (140) covers the top sealing edge of the package (123); and / or, Another portion of the reinforcement (140) covers the sidewall surface (1222b).

6. The battery (100) according to claim 4, characterized in that, Another portion of the reinforcing member (140) covers the second surface (1222c), and the thickness of the reinforcing member (140) located on the first surface (1222a) is greater than the thickness of the reinforcing member (140) located on the second surface (1222c); and / or, The area of ​​the reinforcement (140) located on the second surface (1222c) is less than 80% of the area of ​​the first surface (1222a).

7. The battery (100) according to claim 4, characterized in that, The electrode tab (122) includes a positive electrode tab (1225) and a positive electrode tab (1226), wherein the tensile strength of the positive electrode tab (1225) is less than the tensile strength of the positive electrode tab (1226); The reinforcement (140) covers only the first surface (1222a) of the positive electrode tab (1225).

8. The battery (100) according to claim 4, characterized in that, The battery (100) also includes a temperature detector (150), which is located between the tabs (122) of two adjacent cells (120) and is used to detect the temperature of the cells (120). The second surface (1222c) is not provided with the reinforcement (140).

9. The battery (100) according to any one of claims 1-3, characterized in that, The reinforcing member (140) includes one of a cushioning elastic member and a curing adhesive.

10. The battery (100) according to claim 9, characterized in that, The reinforcing member (140) is a cured adhesive with a thermal conductivity k, and k ≥ 1.2 W / (m·K); and / or, The cured adhesive includes at least one of modified epoxy resin and silicone.

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