Battery monomer, battery and electric device

Abstract

The present application is applicable to the technical field of batteries (100), and provides a battery cell (10), a battery (100) and a power utilization device, the power utilization device comprising the battery (100), the battery (100) comprising the battery cell (10), the battery cell (10) comprising an electrode assembly (11), a first electrode terminal (13a), a first adapter (14a) and a heat insulation structure (15). The electrode assembly (11) comprises a main body part (111) and a first tab (112a) arranged on the main body part (111). The first adapter (14a) is conductively connected to the first tab (112a) and the first electrode terminal (13a). At least part of the heat insulation structure (15) is arranged on the side, facing the main body part (111), of the first adapter (14a). Therefore, the first adapter (14a) and the main body part (111) can be isolated, so that the problem that the first adapter (14a) is in contact with the main body part (111) is solved, and the problem that short circuit occurs in the electrode assembly (11) due to the fact that the first adapter (14a) scalds or melts a diaphragm of the main body part (111) is further solved.

Description

[0001] Cross-references

[0002] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office of the People's Republic of China on August 11, 2023, with application number 202311013229.4 and application name "Battery Cell, Battery and Electrical Device", all contents of which are incorporated by reference in this application. Technical Field

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

[0004] In the related art, a battery cell includes an electrode assembly, an electrode terminal and an adapter, and the adapter is welded to the electrode lug and the electrode terminal of the electrode assembly respectively to achieve conduction between the electrode assembly and the electrode terminal. In this way, the adapter can achieve overcurrent between the electrode assembly and the electrode terminal, and the adapter will generate heat when overcurrent occurs.

[0005] In some cases, the adapter may contact the main body of the electrode assembly, so that the heat generated by the adapter is transferred to the main body of the electrode assembly. This may cause the diaphragm of the electrode assembly to melt, resulting in a risk of a short circuit inside the electrode assembly. Utility Model Content

[0006] In view of the above problems, the purpose of the embodiments of the present application is to provide a battery cell, a battery and an electrical device that can improve the technical problem that the adapter will melt the electrode assembly and cause an internal short circuit in the electrode assembly.

[0007] The technical solution adopted in the embodiment of the present application is:

[0008] In a first aspect, an embodiment of the present application provides a battery cell, including:

[0009] The electrode assembly comprises a main body and a first electrode tab disposed on the main body;

[0010] a first electrode terminal;

[0011] A first adapter, conductively connected to the first electrode tab and the first electrode terminal;

[0012] The heat insulation structure is at least partially disposed on a side of the first adapter facing the main body.

[0013] The battery cell provided in the embodiment of the present application is provided with a heat insulation structure on the side of the first adapter facing the main body, which can slow down the heat conduction between the main body and the first adapter to a certain extent, thereby improving the problem of heat transfer from the first adapter to the main body causing melting of the main body, and further reducing the risk of internal short circuit in the electrode assembly.

[0014] In some embodiments, the thermal conductivity of the thermal insulation structure is ≤ 0.7 W / m·K.

[0015] Such an arrangement enables the heat insulation structure to have a weaker heat conductivity, thereby slowing down the conduction of heat between the first adapter and the main body, thereby reducing the risk of short circuit inside the electrode assembly.

[0016] In some embodiments, the insulating structure has insulating properties.

[0017] With such arrangement, the heat-insulating structure can also achieve insulation between the first adapter and the main body, thereby improving the problem of direct conduction between the first adapter and the main body causing a direct short circuit inside the electrode assembly.

[0018] In some embodiments, the thermal insulation structure includes one or more of a copolymer of perfluoropropyl vinyl ether and polytetrafluoroethylene, mica, ceramic, glass fiber, carbon fiber, carbon-carbon composite material, or pre-oxidized silk aerogel.

[0019] By using the above materials in the heat insulation structure, the heat insulation structure is a high temperature resistant structure with a higher melting point and a lower thermal conductivity, and the heat insulation structure also has insulation performance.

[0020] In some embodiments, the thermal insulation structure is a coating.

[0021] Such an arrangement makes the molding process of the thermal insulation structure very simple.

[0022] In some embodiments, the first adapter is provided with a first position, the first electrode tab is connected to the first position, and the thermal insulation structure is arranged to avoid the first position.

[0023] With such arrangement, on the basis that the heat insulation structure can slow down the heat conduction between the first adapter and the main body, the arrangement of the heat insulation structure can be reduced and the arrangement of the heat insulation structure can be facilitated.

[0024] In some embodiments, the first adapter is provided with a plurality of first positions distributed at intervals, and the first tab is connected to the plurality of first positions.

[0025] Thus, on the one hand, the current distribution between the first adapter and the first pole lug can be more uniform, so that the overcurrent temperature of the first adapter can be reduced. On the other hand, the first adapter and the first pole lug can have a larger overcurrent capacity.

[0026] In some embodiments, the battery cell further includes a shell, and the electrode assembly, the first adapter and the thermal insulation structure are all disposed in the shell; the shell is provided with an injection hole, and the first position is located on a side of the first electrode terminal away from the injection hole.

[0027] By locating the first position on the side of the first electrode terminal away from the injection hole, the first adapter can be arranged as far away from the injection hole as possible, so that the first adapter will not interfere with the operation of the injection hole to a certain extent.

[0028] In some embodiments, the housing is provided with a first wall, and the injection hole and the first electrode terminal are spaced apart from each other on the first wall.

[0029] By such arrangement, the positions of the first adapter, the first electrode terminal and the injection hole can be arranged very compactly, and the first adapter will not interfere with the operation of injecting electrolyte into the housing.

[0030] In some embodiments, the first electrode tab includes a plurality of first sub-electrode tabs, the plurality of first sub-electrode tabs are connected to form a first connection structure, and at least a portion of the first connection structure is connected to the first position.

[0031] The first pole tab is pre-connected to form a first connection structure, and then the first connection structure is conductively connected to the first position, so that the first pole tab can be conductively connected to the first adapter better.

[0032] In some embodiments, the area of ​​all the first positions occupies 10% to 25% of the area of ​​the side of the first adapter facing the main body.

[0033] In this way, the connection position between the first adapter and the first tab has a larger current capacity, and the first adapter can be placed in a lower temperature environment when the first adapter is normally flowing, which can reduce the risk of the diaphragm of the main body being melted. In addition, the first adapter can also reserve a certain position to set the fuse area, so that the fuse area is effectively fused when the first adapter is short-circuited.

[0034] In some embodiments, the first adapter is provided with a positioning through hole, the first electrode terminal is inserted into the positioning through hole, and a portion of the heat insulation structure is provided on a side of the first electrode terminal facing the main body.

[0035] By providing the heat insulating structure on the side of the first electrode terminal facing the main body, the first electrode terminal and the main body can be isolated.

[0036] In some embodiments, the electrode assembly further includes a second electrode tab disposed on the main body; the battery cell further includes a second electrode terminal and a second adapter, and the second adapter is conductively connected to the second electrode tab and the second electrode terminal.

[0037] Such an arrangement enables indirect conduction connection between the first electrode tab and the first electrode terminal, and between the second electrode tab and the second electrode terminal through the adapter, which is conducive to the assembly of the battery cell.

[0038] In some embodiments, the first electrode tab is a positive electrode tab, and the second electrode tab is a negative electrode tab.

[0039] By providing a heat insulating structure on the first adapter used for respectively conducting and connecting the positive electrode tab and the positive electrode terminal, the problem of the first adapter scalding or even melting the diaphragm can be improved, thereby better improving the problem of short circuit of the battery cell.

[0040] In some embodiments, part of the heat insulation structure is disposed on a side of the second adapter facing the main body.

[0041] With such arrangement, the heat insulation structure can slow down the heat conduction between the second adapter and the main body, thereby improving the problem of the second adapter directly contacting the main body, causing burns or even melting of the diaphragm.

[0042] In some embodiments, the second adapter is provided with a second position, the second electrode tab is connected to the second position, and the heat insulation structure is arranged to avoid the second position.

[0043] In this way, on the basis that the heat insulation structure can slow down the heat transfer between the second adapter and the main body, the arrangement of the heat insulation structure can be reduced and the arrangement of the heat insulation structure can be facilitated.

[0044] In some embodiments, the second adapter is provided with a plurality of second positions distributed at intervals, and the second tab is connected to the plurality of second positions.

[0045] In this way, on the one hand, the current distribution between the second adapter and the second pole lug can be more uniform, so that the overcurrent temperature of the second adapter can be reduced. On the other hand, the second adapter and the second pole lug can have a larger overcurrent capacity. On the other hand, the size of the second pole lug in the first direction can be reduced, which helps to improve the energy density of the battery cell.

[0046] In some embodiments, at least a portion of the second electrode terminal is located between the two second locations.

[0047] Such an arrangement makes the multiple second positions of the second adapter for connecting with the second pole tab more dispersed, which can make the current inside the battery cell more uniform, thereby reducing the overcurrent temperature of the second adapter and further reducing the risk of the second adapter causing the diaphragm to melt.

[0048] In some embodiments, the second electrode tab includes a plurality of second sub-electrode tabs, the plurality of second sub-electrode tabs are connected to form a second connection structure, and at least a portion of the second connection structure is connected to the second position.

[0049] The second pole tab is connected to form a second connection structure through a plurality of second sub-pole tabs of the second pole tab, and then conductively connected to the second position through the second connection structure, so that the second pole tab can be conductively connected to the second adapter better.

[0050] In some embodiments, a plurality of second sub-electrode tabs are connected to form a plurality of second connection structures that are spaced apart from each other, and each second connection structure is connected to a corresponding second position.

[0051] A plurality of second sub-pole ears of the second pole ear are connected to form a plurality of second connection structures, so that each second connection structure is connected to each second position of the second adapter, so that the current between the second adapter and the second pole ear can be more evenly distributed, thereby reducing the overcurrent temperature of the second adapter, thereby reducing the risk of internal short circuit of the battery cell caused by diaphragm melting.

[0052] In some embodiments, the areas of all the second positions account for 10% to 25% of the area of ​​the side of the second adapter facing the main body.

[0053] In this way, the connection position between the second adapter and the second tab has a larger current capacity, and when the second adapter is normally overcurrent, the second adapter can be placed in a lower temperature environment, which can reduce the risk of the diaphragm of the main body being melted. In addition, the second adapter can also reserve a certain position to set the fuse area, so that the fuse area is effectively fused when the second adapter is short-circuited.

[0054] In some embodiments, the battery cell further comprises a housing, and the electrode assembly, the first adapter, the second adapter and the heat insulation structure are all disposed in the housing;

[0055] The first pole ear and the second pole ear are respectively arranged at the opposite ends of the main body along the first direction, and the first wall and the second wall are respectively arranged at the opposite ends of the shell along the first direction, the first electrode terminal is arranged on the first wall, and the second electrode terminal is arranged on the second wall; along the first direction, the first adapter is arranged between the first pole ear and the first wall, and the second adapter is arranged between the second pole ear and the second wall.

[0056] By adopting the above technical solution, the overall layout of the battery cells is made more reasonable.

[0057] In a second aspect, an embodiment of the present application provides a battery, including a battery cell.

[0058] The battery provided in the embodiment of the present application can improve the problem of diaphragm melting of the battery monomer by adopting the above-mentioned battery monomer, thereby reducing the risk of battery short circuit.

[0059] In a third aspect, an embodiment of the present application provides an electrical device, including a battery cell or a battery.

[0060] The electrical device provided in the embodiment of the present application can improve the problem of diaphragm melting of the battery cell by adopting the above-mentioned battery cell or battery, thereby reducing the risk of battery short circuit.

[0061] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0062] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or exemplary technical descriptions will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0063] Figure 1 A schematic diagram of a vehicle provided for some embodiments of the present application;

[0064] Figure 2 An exploded schematic diagram of a battery provided in some embodiments of the present application;

[0065] Figure 3 A cross-sectional view of a battery cell provided for some embodiments of the present application;

[0066] Figure 4 for Figure 3 The enlarged view of point A in the middle;

[0067] Figure 5 for Figure 3 A bottom view of the housing, the first adapter, the first electrode terminal and the first thermal insulation member of the provided battery cell;

[0068] Figure 6 for Figure 3 The enlarged view of point B in the middle;

[0069] Figure 7 for Figure 3 A top view of the matching of the battery cell housing, the second adapter, the second electrode terminal and the second thermal insulation member is provided.

[0070] Among them, the reference numerals in the figure are:

[0071] 1000-vehicle; 100-battery; 200-controller; 300-motor; 10-battery cell; 20-housing; 21-first part; 22-second part; 11-electrode assembly; 111-main body; 112-ear; 112a-first ear; 1121a-first connection structure; 112b-second ear; 1121b-second connection structure; 12-housing; 1201-injection hole; 121-housing; 122-end cover; 1 22a-first wall; 122b-second wall; 13-electrode terminal; 13a-first electrode terminal; 13b-second electrode terminal; 14-transfer piece; 1401-first position; 1402-second position; 1403-first positioning through hole; 1404-second positioning through hole; 14a-first transfer piece; 14b-second transfer piece; 15-thermal insulation structure; 151-first thermal insulation piece; 152-second thermal insulation piece; Y-first direction; X-second direction. DETAILED DESCRIPTION

[0072] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0073] In the description of the present application, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0074] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features.

[0075] In the description of the present application, "plurality" means more than two, and unless otherwise clearly and specifically defined, "more than two" includes two. Accordingly, "multiple groups" means more than two groups, including two groups.

[0076] In the description of this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0077] In the description of this application, the term "and / or" is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists, A and B exist at the same time, and B exists. In addition, in this application, the character " / " generally indicates that the associated objects before and after are in an "or" relationship.

[0078] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present application. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

[0079] A battery cell generally includes an electrode assembly, an electrode terminal and an adapter, and the adapter is welded to the electrode lug and the electrode terminal of the electrode assembly respectively to achieve conduction between the electrode assembly and the electrode terminal. In this way, the adapter can achieve flow between the electrode assembly and the electrode terminal.

[0080] It should be noted that the adapter generates heat when there is an overcurrent. In some cases, the adapter will contact the main body of the electrode assembly, so that the heat generated by the adapter is transferred to the main body of the electrode assembly. In this way, there is a risk that the diaphragm of the electrode assembly will melt and cause a short circuit inside the electrode assembly. In particular, when a short circuit occurs in a battery cell, the current inside the adapter increases sharply, and the energy is released sharply, and the temperature inside the adapter increases sharply. Based on this, when the adapter contacts the main body of the electrode assembly, the diaphragm of the main body is very easy to be burned or even melted.

[0081] In the related art, the electrode tabs and adapters of the electrode assembly are welded, so the tabs can provide a certain amount of clearance between the main body of the electrode assembly and the adapter, which can improve the problem of the adapter directly contacting the main body. However, under conditions such as gas production, severe vibration, and a sharp increase in the internal temperature of the electrode assembly, the heat of the adapter is still easily transferred to the main body of the electrode assembly, causing an internal short circuit of the electrode assembly.

[0082] Based on the above considerations, the embodiments of the present application provide a battery cell, a battery and an electrical device. By providing a heat insulating structure on the side of the first adapter facing the main body, the heat conduction between the main body and the first adapter can be slowed down to a certain extent, thereby improving the problem of heat transfer from the first adapter to the main body causing the main body to melt, and further reducing the risk of internal short circuit in the electrode assembly.

[0083] In some embodiments, the battery cells involved in the embodiments of the present application can be used in electrical devices that use battery cells or batteries as power sources, and the batteries involved in the embodiments of the present application can be used in electrical devices that use batteries as power sources.

[0084] The electrical device may be, but is not limited to, a mobile phone, a tablet, a laptop, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc. Among them, the electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc. The vehicle may be a fuel vehicle, a gas vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, etc.

[0085] In some embodiments, the battery cells and batteries involved in the embodiments of the present application may also be used in energy storage devices, wherein the energy storage device may be an energy storage container, an energy storage cabinet, and the like.

[0086] The battery involved in the embodiment of the present application can be a single physical module including one or more battery cells to provide higher voltage and capacity. When there are multiple battery cells, the multiple battery cells are connected in series, in parallel or in hybrid connection through a busbar component. Hybrid connection means that multiple battery cells are connected in both series and in parallel.

[0087] In some embodiments, the battery may be a battery module. When there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module. As an example, the multiple battery cells may be fixed to form a battery module by rolling strips, etc. As an example, the multiple battery cells may also be fixed to form a battery module by end plates, side plates, etc.

[0088] In some embodiments, the battery may be a battery pack, which may include a box and a battery cell. As an example, the battery cell may be directly accommodated in the box. As an example, the battery cell may also be formed into a battery module first and then accommodated in the box.

[0089] For ease of description, the embodiments of the present application are described using an electrical device as a vehicle as an example.

[0090] See also Figure 1 , Figure 1Schematic diagram of a vehicle 1000 provided for some embodiments of the present application. The above-mentioned battery 100 is disposed inside the vehicle 1000, and the battery 100 can be disposed at the bottom, head, or tail of the vehicle 1000. The battery 100 can be used to power the vehicle 1000, for example, the battery 100 can be used as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery 100 to power the motor 300, for example, for the starting, navigation, and working power requirements of the vehicle 1000 during driving.

[0091] In some embodiments, the battery 100 can be used not only as an operating power source for the vehicle 1000 , but also as a driving power source for the vehicle 1000 , replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000 .

[0092] See also Figure 2 , Figure 2 An exploded view of a battery 100 provided for some embodiments of the present application. The battery 100 includes a housing 20 and a plurality of battery cells 10. The housing 20 is a structure having a storage space inside, and the housing 20 may adopt a variety of structures. In some embodiments, the housing 20 may include a first portion 21 and a second portion 22, which cover each other and jointly define the above-mentioned storage space. The first portion 21 may be a hollow structure having an opening at one end, and the second portion 22 is a plate-like structure, and the second portion 22 covers the open side of the first portion 21, so that the first portion 21 and the second portion 22 jointly define the above-mentioned storage space; or, the first portion 21 and the second portion 22 may both be hollow structures having an opening at one end, such as Figure 2 As shown, the opening side of the first part 21 covers the opening side of the second part 22, so that the first part 21 and the second part 22 jointly define the above-mentioned accommodation space. Among them, the box body 20 composed of the first part 21 and the second part 22 can be of various shapes, such as a cylinder, a cuboid, etc.

[0093] In some embodiments, a plurality of battery cells 10 may be connected in series, in parallel or in mixed connection to form a whole, and then the whole formed by the plurality of battery cells 10 may be directly accommodated in the above-mentioned accommodation space of the box body 20, such as Figure 2 Multiple battery cells 10 can also be connected in series, parallel or mixed, and arranged and fixed to form multiple battery modules, and then multiple battery modules are connected in series, parallel or mixed to form a whole, and accommodated in the above-mentioned accommodation space of the box body 20.

[0094] In some embodiments, please combine Figure 1 and Figure 2When the battery 100 is applied to the vehicle 1000, the box 20 of the battery 100 can be used as a part of the chassis structure of the vehicle 1000. For example, part of the box 20 can become at least a part of the chassis of the vehicle 1000, or part of the box 20 can become at least a part of the cross beam and the longitudinal beam of the vehicle 1000.

[0095] The battery cell 10 refers to the smallest unit for storing and outputting electric energy. The battery cell 10 may be a secondary battery or a primary battery. The battery cell 10 may be, but is not limited to, a metal battery, a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery. The battery cell 10 may be cylindrical, flat, rectangular, or in other shapes.

[0096] See also Figure 3 , Figure 3 The cross-sectional view of a battery cell 10 provided in some embodiments of the present application. The battery cell 10 includes an electrode assembly 11, a housing 12 and an electrode terminal 13.

[0097] The electrode assembly 11 is a component in the battery cell 10 where electrochemical reactions occur. The electrode assembly 11 is mainly formed by winding or stacking the positive electrode sheet and the negative electrode sheet, and a separator is provided between the positive electrode sheet and the negative electrode sheet. The parts of the positive electrode sheet and the negative electrode sheet with active materials constitute the main body 111 of the electrode assembly 11, and the parts of the positive electrode sheet and the negative electrode sheet without active materials each constitute a pole ear 112. The pole ear 112 of the positive electrode sheet is the positive pole ear, and the pole ear 112 of the negative electrode sheet is the negative pole ear. The positive pole ear and the negative pole ear can be located together at one end of the main body or respectively at opposite ends of the main body 111.

[0098] In the battery cell 10 , the number of the electrode assembly 11 may be one or more.

[0099] In some cases, the electrode assembly 11 may also be referred to as a bare cell, a wound body, a laminated body, etc.

[0100] In some embodiments, the battery cell 10 may further include an electrolyte, which plays a role in conducting ions between the positive electrode plate and the negative electrode plate. The electrolyte involved in the embodiments of the present application may be liquid, gel or solid.

[0101] The outer shell 12 may include a shell 121 and an end cap 122. The shell 121 and the end cap 122 are components for jointly defining the internal environment of the battery cell 10. The internal environment defined by the shell 121 and the end cap 122 is used to accommodate the electrode assembly 11 and the electrolyte. The shell 121 and the end cap 122 may be independent components. Specifically, the shell 121 has an opening, and the end cap 122 is covered at the opening of the shell 121 to jointly define the internal environment of the battery cell 10 with the shell 121, and to isolate the internal environment of the battery cell 10 from the external environment. The shell 121 and the end cap 122 may also be an integrated structure. Specifically, a common connection surface may be formed between the end cap 122 and the shell 121 before the electrode assembly 11 is placed in the shell. When the electrode assembly 11 needs to be packaged after the electrode assembly 11 is placed in the shell, the end cap 122 covers the shell 121.

[0102] The number of the end cap 122 may be one. The number of the end cap 122 may also be two, and the two end caps 122 are respectively disposed at two opposite ends of the housing 121 .

[0103] The shell 121 may be cylindrical, square, or other shapes, which may be determined according to the specific shape and size of the electrode assembly 11. In addition, the shell 121 and the end cap 122 may be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, or the like.

[0104] The electrode terminal 13 refers to a component with conductive properties, and the electrode terminal 13 serves as a current transmission end of the battery cell 10 for transmitting current. The electrode terminal 13 may be, but is not limited to, a pole.

[0105] The electrode terminal 13 is electrically connected to the pole tab 112. Specifically, the electrode terminal 13 can be directly electrically connected to the pole tab 112, such as by welding. An adapter 14 can also be provided between the electrode terminal 13 and the pole tab 112, and the adapter 14 realizes the connection between the electrode terminal 13 and the pole tab 112 so as to enable current flow, thereby indirectly realizing the conduction connection between the electrode terminal 13 and the pole tab 112. The adapter 14 refers to a metal structure with conductive properties, such as but not limited to a copper busbar. The adapter 14 is provided in the housing 12.

[0106] There are two electrode terminals 13 , which are a positive electrode terminal and a negative electrode terminal respectively. The positive electrode terminal is conductively connected to the positive electrode tab, and the negative electrode terminal is conductively connected to the negative electrode tab.

[0107] The electrode terminal 13 is disposed on the housing 12. Specifically, the electrode terminal 13 can be disposed on the housing 121 of the housing 12, or on the end cap 122 of the housing 12. For example, the positive electrode terminal and the negative electrode terminal can be disposed on the housing 121 at the same time; or Figure 3As shown, the positive electrode terminal and the negative electrode terminal are both disposed on the end cover 122 ; or, one of the positive electrode terminal and the negative electrode terminal is disposed on the shell 121 , and the other is disposed on the end cover 122 .

[0108] The positive electrode terminal and the negative electrode terminal may be disposed at the same end of the housing 12; or Figure 3 As shown, the positive electrode terminal and the negative electrode terminal can be disposed at opposite ends of the housing 12 .

[0109] Please also read Figure 3 and Figure 4 , and combined with other drawings. Among them, Figure 4 for Figure 3 The enlarged view of A in the figure. The battery cell 10 provided in the embodiment of the present application includes an electrode assembly 11, a first electrode terminal 13a, a first adapter 14a and a thermal insulation structure 15. The electrode assembly 11 includes a main body 111 and a first pole ear 112a, and the first pole ear 112a is arranged on the main body 111. The first adapter 14a is conductively connected to the first pole ear 112a and the first electrode terminal 13a. At least part of the thermal insulation structure 15 is arranged on the side of the first adapter 14a facing the main body 111.

[0110] The first electrode tab 112 a may be a positive electrode tab or a negative electrode tab.

[0111] It can be understood that the electrode assembly 11 further includes a second pole tab 112b, and the first pole tab 112a and the second pole tab 112b are spaced apart from each other in the main body 111. When the first pole tab 112a is a positive pole tab, the second pole tab 112b is a negative pole tab. When the first pole tab 112a is a negative pole tab, the second pole tab 112b is a positive pole tab.

[0112] The first electrode terminal 13a is the above-mentioned electrode terminal 13, which is a component with conductive properties, and can be but is not limited to a pole. The first electrode terminal 13a is used as a current transmission end of the battery cell 10 to transmit current. When the first pole ear 112a is a positive pole ear, the first electrode terminal 13a is a positive electrode terminal, and the first adapter 14a is a positive adapter. When the first pole ear 112a is a negative pole ear, the first electrode terminal 13a is a negative electrode terminal, and the first adapter 14a is a negative adapter.

[0113] The first adapter 14a is the adapter 14, which is a conductive component and can be, but is not limited to, a copper busbar. The first adapter 14a is used to connect the first electrode terminal 13a and the first tab 112a to indirectly achieve conductive connection between the first electrode terminal 13a and the first tab 112a.

[0114] The first adapter 14a is conductively connected to the first pole lug 112a and the first electrode terminal 13a, which means that the first adapter 14a is conductively connected to the first pole lug 112a, and the first adapter 14a is conductively connected to the first pole terminal 13a. The first adapter 14a is conductively connected to the first pole lug 112a, which means that the first adapter 14a is connected to the first pole lug 112a, and the first adapter 14a is electrically conductive to the first pole lug 112a. The first adapter 14a is conductively connected to the first electrode terminal 13a, which means that the first adapter 14a is connected to the first electrode terminal 13a, and the first adapter 14a is electrically conductive to the first electrode terminal 13a. Based on this, the first adapter 14a can achieve overcurrent between the first pole lug 112a and the first electrode terminal 13a.

[0115] As an example, the first adapter 14a is welded to the first pole tab 112a to achieve a conductive connection. As an example, the first adapter 14a is welded to the first electrode terminal 13a to achieve a conductive connection. The first adapter 14a and the first pole tab 112a can be conductively connected by laser welding, ultrasonic welding, penetration welding, etc., and the first adapter 14a and the first electrode terminal 13a can also be conductively connected by laser welding, ultrasonic welding, penetration welding, etc.

[0116] like Figure 3 and Figure 4 As shown, the first transition member 14 a is disposed on the first electrode tab 112 a , such that at least a portion of the first transition member 14 a faces the main body 111 of the electrode assembly 11 .

[0117] The heat-insulating structure 15 refers to a component with a heat-insulating function. Among them, the heat-insulating structure 15 can block heat to slow down the spread of heat. Specifically, at least part of the heat-insulating structure 15 is arranged on the side of the first adapter 14a facing the main body 111, so that the heat-insulating structure 15 can separate the first adapter 14a and the main body 111, and prevent the first adapter 14a from directly contacting the main body 111 to a certain extent. In addition, the heat-insulating structure 15 can also isolate the heat between the first adapter 14a and the main body 111, thereby improving the problem of heat spreading from the first adapter 14a to the main body 111.

[0118] It can be understood that the thermal insulation structure 15 may include a first thermal insulation member 151, which is a portion of the thermal insulation structure 15 disposed on a side of the first adapter 14a facing the main body 111. That is, the first thermal insulation member 151 is a portion of the thermal insulation structure 15 and also has a thermal insulation function.

[0119] As an example, Figure 3 and Figure 4As shown, the first pole tab 112a is disposed at one end of the main body 111 along the first direction Y. In the first direction Y, the first adapter 14a is disposed at one end of the first pole tab 112a away from the main body, and the first adapter 14a is respectively connected to the first electrode terminal 13a and the first pole tab 112a. At least a portion of the first adapter 14a faces the main body 111 along the first direction Y. In addition, at least a portion of the thermal insulation structure 15 is disposed on a side of the first adapter 14a facing the main body 111 along the first direction Y. In this way, under the isolation effect of the thermal insulation structure 15, the first adapter 14a cannot directly contact the main body 111, that is, the thermal insulation structure 15 can improve the problem of the first adapter 14a directly contacting the main body 111. In addition, the thermal insulation structure 15 can also isolate the heat of the first adapter 14a and the main body 111 to improve the problem of the heat of the first adapter 14a being transferred to the main body 111, causing the diaphragm to be scalded or melted.

[0120] The first direction Y is the height direction or the length direction of the battery cell 10 .

[0121] Figure 3 and Figure 4 , the plane coordinate system is shown in FIG. 1 , the X axis and the Y axis are two mutually perpendicular coordinate axes in the plane coordinate system, that is, the Y axis is perpendicular to the X axis. The first direction Y is parallel to the Y axis, and the X axis is parallel to the second direction X mentioned below, that is, the first direction Y is perpendicular to the second direction X.

[0122] The first electrode tab 112 a and the second electrode tab 112 b may be disposed at two opposite ends of the main body 111 along the first direction Y, or the first electrode tab 112 a and the second electrode tab 112 b may be disposed at the same end of the main body 111 along the first direction Y with an interval.

[0123] In the battery cell 10 provided in the embodiment of the present application, the first pole tab 112a and the first adapter 14a are conductively connected, and the first electrode terminal 13a and the first adapter 14a are conductively connected to realize an indirect conductive connection between the first pole tab 112a and the first electrode terminal 13a. In addition, a heat insulation structure 15 is provided on the side of the first adapter 14a facing the main body 111. In this way, the main body 111 and the first adapter 14a can be separated to a certain extent to improve the problem of the first adapter 14a directly contacting the main body 111. In addition, the heat insulation structure 15 can also slow down the heat conduction between the main body 111 of the electrode assembly 11 and the first adapter 14a, thereby improving the problem of the heat of the first adapter 14a being transferred to the main body 111 and causing the diaphragm of the main body 111 to melt, thereby reducing the risk of internal short circuit of the electrode assembly 11.

[0124] In some embodiments, the thermal conductivity of the thermal insulation structure 15 is ≤0.7 W / m·K.

[0125] For example, the thermal conductivity of the thermal insulation structure 15 may be 0.7 W / m·K, 0.65 W / m·K, 0.6 W / m·K, 0.55 W / m·K, 0.5 W / m·K, or the like.

[0126] By setting the heat insulating structure 15 to a structure with a smaller thermal conductivity coefficient, the heat insulating structure 15 can have a weaker thermal conductivity effect, which can slow down the conduction of heat between the first adapter 14a and the main body 111, thereby improving the problem of melting of the diaphragm of the main body 111, and further reducing the risk of internal short circuit of the electrode assembly 11.

[0127] In some embodiments, the thermal insulation structure 15 has insulating properties.

[0128] With such configuration, the heat insulating structure 15 can also achieve insulation between the first adapter 14 a and the main body 111 , thereby improving the problem of direct short circuit inside the electrode assembly 11 caused by direct conduction between the first adapter 14 a and the main body 111 .

[0129] In some embodiments, the thermal insulation structure 15 includes one or more of a copolymer of perfluoropropyl vinyl ether and polytetrafluoroethylene, mica, ceramic, glass fiber, carbon fiber, carbon-carbon composite material, or pre-oxidized silk aerogel.

[0130] It is understandable that the thermal insulation structure 15 can be made of at least one of the above-mentioned materials, so that the thermal insulation structure 15 includes at least one of a structure composed of a copolymer of perfluoropropyl perfluorovinyl ether and polytetrafluoroethylene, a mica structure, a ceramic structure, a glass fiber structure, a carbon fiber structure, a carbon-carbon composite material, or a pre-oxidized silk aerogel structure.

[0131] By using the above-mentioned material for the heat insulation structure 15, the heat insulation structure 15 is a high temperature resistant structure with a high melting point and a low thermal conductivity coefficient, so that the heat insulation structure 15 has a better heat insulation effect, and can effectively improve the problem of the heat of the first adapter 14a being transferred to the diaphragm of the main body 111, causing the diaphragm to be scalded or melted, thereby improving the problem of the main body 111 being short-circuited. In addition, the heat insulation structure 15 also has insulation performance, thereby improving the problem of the first adapter 14a and the main body 111 being connected, causing the battery cell 10 to be short-circuited.

[0132] In some embodiments, the thermal insulation structure 15 is a coating layer.

[0133] It can be understood that a coating having heat insulation properties may be coated on the side of the first adapter 14 a facing the main body 111 , thereby forming a heat insulation structure 15 .

[0134] Such an arrangement makes the molding process of the heat insulation structure 15 very simple.

[0135] In some embodiments, please refer to Figures 3 to 5 , and combined with other drawings. Among them, Figure 5 A bottom view of the housing 12, the first adapter 14a, the first electrode terminal 13a and the first thermal insulation member 151 of the battery cell 10 provided in the embodiment of the present application, specifically a view in the direction of the second adapter 14b pointing to the first adapter 14a along the first direction Y, and the bottom view shows the projection of the first electrode terminal 13a, the first pole ear 112a, the first connection structure 1121a and the first position 1401 on the first adapter 14a through dotted lines. The first adapter 14a has a first position 1401, and the first pole ear 112a is connected to the first position 1401. The thermal insulation structure 15 is set to avoid the first position 1401.

[0136] The first position 1401 refers to a position of the first adapter 14a for connecting with the first electrode tab 112a. Specifically, the first electrode tab 112a is conductively connected to the portion of the first adapter 14a located at the first position 1401.

[0137] When the first adapter 14 a is welded to the first electrode tab 112 a , a weld mark formed by welding the first adapter 14 a and the first electrode tab 112 a is located at the first position 1401 .

[0138] In this way, on the basis that the heat insulation structure 15 can slow down the heat conduction between the first adapter 14 a and the main body 111 , the arrangement of the heat insulation structure 15 can be reduced, and it is convenient to arrange the heat insulation structure 15 on the first adapter 14 a .

[0139] In some embodiments, please refer to Figures 3 to 5 , and in combination with other drawings. The first adapter 14 a has a plurality of the first positions 1401 distributed at intervals, and the first tab 112 a is connected to the plurality of the first positions 1401 .

[0140] The first pole lug 112a is connected to a plurality of different positions of the first adapter 14a by connecting the first pole lug 112a to the first positions 1401 of the first adapter 14a. In this way, on the one hand, the current distribution between the first adapter 14a and the first pole lug 112a can be more uniform, so that the overcurrent temperature of the first adapter 14a can be reduced to improve the problem of heat concentration caused by current concentration of the first adapter 14a, and further improve the problem of excessive heat of the first adapter 14a causing the diaphragm of the main body 111 to be scalded or melted, thereby reducing the risk of short circuit of the battery cell 10. On the other hand, the first adapter 14a and the first pole lug 112a can have a larger overcurrent capacity.

[0141] In some embodiments, to facilitate the conductive connection between the first electrode tab 112 a and the first adapter 14 a , the first position 1401 is located on a side of the first adapter 14 a facing the main body 111 .

[0142] In some embodiments, please refer to Figures 3 to 5 , and in combination with other drawings. The battery cell 10 also includes a housing 12, the electrode assembly 11, the first adapter 14a and the heat insulation structure 15 are all arranged in the housing 12, and the first electrode terminal 13a is arranged in the housing 12. The housing 12 is provided with a liquid injection hole 1201. The first position 1401 is located on a side of the first electrode terminal 13a away from the liquid injection hole 1201.

[0143] The injection hole 1201 refers to a hole for supplying electrolyte to the internal environment of the battery cell 10. Specifically, the injection hole 1201 is a through hole opened in the outer shell 12, and the injection hole 1201 is connected to the internal environment defined by the outer shell 12, so that the electrolyte can be injected into the internal environment defined by the outer shell 12 through the injection hole 1201, so that the electrolyte infiltrates the electrode assembly 11 in the internal environment defined by the outer shell 12. The injection hole 1201 can be set in the shell 121 of the outer shell 12, and can also be set in the end cover 122 of the outer shell 12.

[0144] The first position 1401 is located on the side of the first electrode terminal 13a away from the injection hole 1201. It can be understood that in the distribution direction of the first electrode terminal 13a and the injection hole 1201, the first position 1401 is located on the side of the first electrode terminal 13a away from the injection hole 1201, that is, at least part of the first electrode terminal 13a is located between the first position 1401 and the injection hole 1201, so that the connection line (straight line) between the injection hole 1201 and the first position 1401 can pass through the first electrode terminal 13a. In addition, multiple first positions 1401 are located on the same side of the first electrode terminal 13a away from the injection hole 1201, that is, the connection line (straight line) between any two adjacent first positions 1401 does not pass through the first electrode terminal 13a.

[0145] As an example, Figure 5 As shown in FIG. 1 and in combination with other drawings, the first electrode terminal 13a and the injection hole 1201 are distributed in sequence along the second direction X.

[0146] Since the first position 1401 is located on the side of the first electrode terminal 13a away from the injection hole 1201, the first adapter 14a can be arranged as far away from the injection hole 1201 as possible, so that the first adapter 14a will not interfere with the operation of the injection hole 1201.

[0147] In some embodiments, please refer to Figures 3 to 5, and in combination with other drawings. The housing 12 is provided with a first wall 122a, and the injection hole 1201 and the first electrode terminal 13a are spaced apart from each other on the first wall 122a.

[0148] It can be understood that the injection hole 1201 and the first electrode terminal 13a are arranged at intervals on the same side wall of the housing 12. For example, the first wall 122a is arranged on the side wall of the housing 12 along the first direction Y. In the first direction Y, the first adapter 14a is arranged between the first electrode tab 112a and the first wall 122a. In addition, in the second direction X, the first position 1401 is arranged on the side of the first electrode terminal 13 away from the injection hole 1201.

[0149] The first wall 122 a may be the shell 121 of the outer shell 12 , or may be the end cover 122 of the outer shell 12 .

[0150] In this way, the positions of the first adapter 14a, the first electrode terminal 13a and the injection hole 1201 can be arranged very compactly, which helps to improve the energy density of the battery cell 10. In addition, the first electrode terminal 13a and the injection hole 1201 are arranged at intervals, that is, the first adapter 14a is arranged away from the injection hole 1201. In this way, the first adapter 14a will not interfere with the operation of injecting electrolyte into the housing 12.

[0151] like Figure 3 and Figure 5 As shown, the injection hole 1201 and the first adapter 14a are spaced apart along the first direction Y. Furthermore, the injection hole 1201 and the first adapter 14a are also spaced apart along the second direction X, so that the injection hole 1201 and the first adapter 14a are spaced apart.

[0152] In some embodiments, when the area of ​​the first adapter 14a is large enough, the multiple first positions 1401 can also be distributed on opposite sides of the first electrode terminal 13a, specifically, at least part of the first electrode terminal 13a is disposed between two first positions 1401, that is, the connecting line (straight line) of the two first positions 1401 can pass through the first electrode terminal 13a. In this way, the current distribution of the first adapter 14a can be made more uniform, and the risk of diaphragm melting can be reduced.

[0153] In some embodiments, please refer to Figures 3 to 5 , and in combination with other drawings. The first electrode tab 112 a includes a plurality of first sub-electrode tabs, the plurality of first sub-electrode tabs are connected to form a first connection structure 1121 a , and at least a portion of the first connection structure 1121 a is connected to the first position 1401 .

[0154] The first sub-electrode tab is a part of the first electrode tab 112a. The first sub-electrode tab is disposed on the main body 111. A plurality of first sub-electrode tabs constitute the first electrode tab 112a.

[0155] The first connection structure 1121a is a part of the first tab 112a. A plurality of first sub-tabs are connected to form the first connection structure 1121a, so that the integrity of the first tab 112a is high, which is conducive to the connection between the first tab 112a and the first adapter 14a, and also facilitates the conduction between the first tab 112a and the first adapter 14a.

[0156] Based on the above structure, in the process of conductively connecting the first pole ear 112a and the first adapter 14a, the multiple first sub-pole ears of the first pole ear 112a can be connected to form a first connection structure 1121a, and then the first connection structure 1121a can be connected to the first position 1401 of the first adapter 14a to form a conductive connection between the first connection structure 1121a and the first adapter 14a.

[0157] The first pole tab 112a is connected to form a first connection structure 1121a through a plurality of first sub-pole tabs, and then the first connection structure 1121a is conductively connected to the first position 1401, so that the first pole tab 112a can be better conductively connected to the first adapter 14a.

[0158] In some embodiments, the plurality of first sub-tabs are welded to form the first connection structure 1121 a , that is, the plurality of first sub-tabs are pre-welded to form the first connection structure 1121 a .

[0159] In some embodiments, a plurality of first sub-electrode tabs may be pre-welded by ultrasonic welding to form a first connection structure 1121a, and the first connection structure 1121a may be laser welded to the first position 1401 of the first adapter 14a. Of course, a plurality of first sub-electrode tabs may also be connected by other means to form the first connection structure 1121a, and the first connection structure 1121a and the first adapter 14a may also be conductively connected by other means.

[0160] In some embodiments, when a plurality of first sub-electrode tabs are connected to form the first connection structure 1121a, they may also be simultaneously connected to the first adapter 14a, so as to improve the connection strength between the first electrode tab 112a and the first adapter 14a, and help improve the conduction stability between the first electrode tab 112a and the first adapter 14a.

[0161] In some embodiments, Figure 5 As shown, the first heat insulating member 151 is disposed away from the first connection structure 1121a. Specifically, the first heat insulating member 151 is disposed away from the projection of the first connection structure 1121a on the side of the first adapter 14a facing the main body 111.

[0162] In this way, on the basis that the heat insulation structure 15 can slow down the heat conduction between the first adapter 14 a and the main body 111 , the arrangement of the heat insulation structure 15 can be reduced.

[0163] In some embodiments, please refer to Figures 3 to 5 , and in combination with other drawings, the area of ​​all first positions 1401 of the first adapter 14 a accounts for 10% to 25% of the area of ​​the side of the first adapter 14 a facing the main body 111 .

[0164] It can be understood that the first position 1401 is located on the side of the first adapter 14a facing the main body 111. The area of ​​the first position 1401 accounts for 11%, 12%, 15%, 16%, 18%, 20%, 21%, 22%, 24%, etc. of the area of ​​the side of the first adapter 14a facing the main body 111.

[0165] Such a configuration allows the first position 1401 to have a relatively suitable area, that is, the projection of the connection trace between the first pole tab 112a and the first adapter 14a on the first adapter 14a has a relatively suitable area. In this way, the connection position between the first adapter 14a and the first pole tab 112a has a relatively large current-carrying capacity, and when the first adapter 14a is normally flowing, the first adapter 14a can be placed in a relatively low temperature environment, which can reduce the risk of the diaphragm of the main body 111 being melted. In addition, the first adapter 14a can also reserve a certain position to set a fuse area, so that the fuse area is effectively fused when the first adapter 14a is short-circuited.

[0166] The fuse area refers to the area of ​​the first adapter 14 a that fuses when a short circuit occurs, so that the first adapter 14 a can be disconnected to achieve a protection function.

[0167] In some embodiments, please refer to Figures 3 to 5 , and combined with other drawings. The first adapter 14a is provided with a positioning through hole, and the first electrode terminal 13a is inserted into the positioning through hole. Part of the thermal insulation structure 15 is provided on the side of the first electrode terminal 13a facing the main body 111, that is, the first thermal insulation member 151 of the thermal insulation structure 15 is also provided on the side of the first electrode terminal 13a facing the main body 111.

[0168] The positioning through hole is a through hole that passes through the first adapter 14a. For ease of description, the positioning through hole is the first positioning through hole 1403, and the first electrode terminal 13a is inserted into the first positioning through hole 1403, which can realize the positioning between the first electrode terminal 13a and the first adapter 14a, so as to facilitate the conductive connection between the first electrode terminal 13a and the first adapter 14a.

[0169] like Figure 4As shown, the first positioning through hole 1403 passes through the first adapter 14a along the first direction Y. In this way, when the first electrode terminal 13a is inserted into the first positioning through hole 1403, one end of the first electrode terminal 13a along the first direction Y is disposed facing the main body 111. In this way, there is a risk that the first electrode terminal 13a directly contacts the main body 111, thereby scalding or even melting the diaphragm.

[0170] By arranging the heat insulating structure 15 on the side of the first electrode terminal 13a facing the main body 111, the first electrode terminal 13a and the main body 111 can be separated. On the one hand, the problem of the first electrode terminal 13a scalding or even melting the separator can be improved to reduce the risk of internal short circuit of the electrode assembly 11. On the other hand, when the heat insulating structure 15 has insulating properties, it can also achieve insulation between the first electrode terminal 13a and the main body 111, so that the problem of the first electrode terminal 13a contacting the main body 111 and causing internal short circuit of the battery cell 10 can be improved.

[0171] It should be noted that when the first electrode terminal 13a does not extend out of the first positioning through hole 1403 so that there is no risk of the first electrode terminal 13a directly contacting the main body 111, the heat insulation structure 15 may not be provided on the side of the first electrode terminal 13a facing the main body 111.

[0172] In some embodiments, please refer to Figure 3 and Figure 6 , and combined with other drawings. Among them, Figure 6 for Figure 3 The electrode assembly 11 further includes a second pole tab 112b, and the first pole tab 112a and the second pole tab 112b are spaced apart from each other in the main body 111. The battery cell 10 further includes a second electrode terminal 13b and a second adapter 14b, and the second adapter 14b is conductively connected to the second pole tab 112b and the second electrode terminal 13b.

[0173] The second electrode terminal 13b is also the electrode terminal 13, which is a component with conductive properties, and can be but is not limited to a pole. The second electrode terminal 13b is used as a current transmission end of the battery cell 10 to transmit current.

[0174] The second adapter 14b is the adapter 14, which is a conductive component and can be, but is not limited to, a copper busbar. The second adapter 14b is used to connect the second electrode terminal 13b and the second tab 112b to indirectly achieve conductive connection between the second electrode terminal 13b and the second tab 112b.

[0175] Among them, the way in which the second pole ear 112b is conductively connected to the second adapter 14b can refer to the way in which the first pole ear 112a is conductively connected to the first adapter 14a, and the way in which the second adapter 14b is conductively connected to the second electrode terminal 13b can also refer to the way in which the first electrode terminal 13a is conductively connected to the first adapter 14a, which will not be repeated here.

[0176] Such an arrangement enables indirect conduction connection between the first electrode tab 112 a and the first electrode terminal 13 a , and between the second electrode tab 112 b and the second electrode terminal 13 b through the adapter 14 , which facilitates the assembly of the battery cell 10 .

[0177] In some embodiments, see Figure 3 , and in combination with other drawings. The first pole tab 112a is a positive pole tab, and the second pole tab 112b is a negative pole tab.

[0178] Correspondingly, the first electrode terminal 13a is a positive electrode terminal, and the first adapter 14a is a positive adapter.

[0179] It should be noted that when the battery cell 10 is in use, the heat of the positive electrode adapter is higher than that of the negative electrode adapter, which is more likely to burn or even melt the separator. The first adapter 14a contacts the main body 111, causing a higher risk of short-circuiting the electrode assembly 11.

[0180] By providing a heat insulating structure 15 on the first adapter 14a used for respectively conducting and connecting the positive electrode tab and the positive electrode terminal, the problem of the first adapter 14a scalding or even melting the separator can be improved, thereby better improving the problem of short circuit of the battery cell 10.

[0181] In some embodiments, please refer to Figures 3 to 6 , and in combination with other drawings. Part of the heat insulation structure 15 is disposed on a side of the second adapter 14 b facing the main body 111 .

[0182] It can be understood that the thermal insulation structure 15 can also include a second thermal insulation member 152, which is a portion of the thermal insulation structure 15 disposed on a side of the second adapter 14b facing the main body 111. That is, the second thermal insulation member 152 is a portion of the thermal insulation structure 15 and also has a thermal insulation function.

[0183] like Figure 3 and Figure 6As shown, the second pole tab 112b is also disposed at the end of the main body 111 along the first direction Y. The first pole tab 112a and the second pole tab 112b can be disposed at opposite ends of the main body 111 along the first direction Y, or at the same end of the main body 111 along the first direction Y. In addition, in the first direction Y, the second adapter 14b is disposed between the second pole tab 112b and the second electrode terminal 13b, and the second adapter 14b is disposed facing the main body 111 along the first direction Y. The second thermal insulation member 152 is disposed on the side of the second adapter 14b facing the main body 111 along the first direction Y.

[0184] With such a configuration, the heat insulating structure 15 can slow down the heat conduction between the second adapter 14 b and the main body 111 , thereby improving the problem of the second adapter 14 b directly contacting the main body 111 , causing burns or even melting of the membrane.

[0185] Furthermore, when the heat insulation structure 15 also has insulation performance, the risk of short-circuiting the battery cell 10 due to the conduction between the second adapter 14 b and the main body 111 can be reduced.

[0186] In some embodiments, please refer to Figure 3 , Figure 6 and Figure 7 , and combined with other drawings. Among them, Figure 7 A top view of the housing 12, the second adapter 14b, the second electrode terminal 13b, and the second thermal insulation member 152 of the battery cell 10 provided in some embodiments of the present application, specifically a view from the first adapter 14a in the direction pointing to the second adapter 14b along the first direction Y, and the top view shows the projection of the second electrode terminal 13b, the second pole ear 112b, the second connection structure 1121b, and the second position 1402 on the second adapter sheet through dotted lines. The second adapter 14b is provided with a second position 1402, the second pole ear 112b is connected to the second position 1402, and the thermal insulation structure 15 is arranged to avoid the second position 1402.

[0187] The second position 1402 refers to a position of the second adapter 14b for connecting with the second pole tab 112b. Specifically, the second pole tab 112b is conductively connected to the portion of the second adapter 14b located at the second position 1402.

[0188] When the second adapter 14 b and the second electrode tab 112 b are welded, a weld mark formed by the welding of the second adapter 14 b and the second electrode tab 112 b is located at the second position 1402 .

[0189] In this way, on the basis that the heat insulation structure 15 can slow down the heat conduction between the second adapter 14 b and the main body 111 , the arrangement of the heat insulation structure 15 can be reduced, and it is convenient to arrange the heat insulation structure 15 on the second adapter 14 b .

[0190] In some embodiments, please refer to Figure 3 , Figure 6 and Figure 7 , and in combination with other drawings. The second adapter 14 b has a plurality of the second positions 1402 distributed at intervals, and the second tab 112 b is connected to the plurality of second positions 1402 .

[0191] The second pole lug 112b is connected to a plurality of different positions of the second adapter 14b by connecting the second pole lug 112b to the portions corresponding to the plurality of second positions 1402 of the second adapter 14b. In this way, on the one hand, the current distribution between the second adapter 14b and the second pole lug 112b can be more uniform, so that the overcurrent temperature of the second adapter 14b can be reduced, so as to improve the problem of heat concentration caused by the current concentration of the second adapter 14b, and further improve the problem of the diaphragm of the main body 111 being scalded or melted due to excessive heat of the second adapter 14b, thereby reducing the risk of short circuit of the battery cell 10. On the other hand, a larger overcurrent capacity can be provided between the second adapter 14b and the second pole lug 112b. On the other hand, the size of the second pole lug 112b in the first direction Y can be reduced, thereby helping to improve the energy density of the battery cell 10.

[0192] In some embodiments, in order to facilitate the conductive connection between the second electrode tab 112 b and the second adapter 14 b , the second position 1402 is located on a side of the second adapter 14 b facing the main body 111 .

[0193] In some embodiments, see Figure 7 , and in combination with other drawings. At least a portion of the second electrode terminal 13 b is located between the two second positions 1402 .

[0194] It can be understood that the connecting line (straight line) of the two second positions 1402 can pass through the second electrode terminal 13b.

[0195] As an example, Figure 7 As shown, the two second positions 1402 are spaced apart along the second direction X. Moreover, a portion of the second electrode terminal 13b is located between the two second positions 1402, so that one of the second positions 1402, a portion of the second electrode terminal 13b, and another second position 1402 are sequentially distributed along the second direction X, so that the two second positions 1402 are located on opposite sides of the second electrode terminal 13b along the second direction X. Of course, in other examples, the two second positions 1402 may also be spaced apart along directions intersecting the first direction Y and the second direction X, respectively, and at least a portion of the second electrode terminal 13b is located between the two second positions 1402.

[0196] Such arrangement makes the multiple second positions 1402 of the second adapter 14b for connecting with the second pole ear 112b more dispersed, which can make the current inside the battery cell 10 more uniform, thereby reducing the overcurrent temperature of the second adapter 14b and further reducing the risk of the second adapter 14b causing the diaphragm to melt.

[0197] In some embodiments, see Figure 7 , and in combination with other drawings. The second electrode tab 112 b includes a plurality of second sub-electrode tabs, the plurality of second sub-electrode tabs are connected to form a second connection structure 1121 b , and at least a portion of the second connection structure 1121 b is connected to the second position 1402 .

[0198] The second sub-electrode tab is a part of the second electrode tab 112b. The second sub-electrode tab is disposed on the main body 111. A plurality of second sub-electrode tabs constitute the second electrode tab 112b.

[0199] The second connection structure 1121b is a part of the second pole tab 112b. A plurality of second sub-pole tabs are connected to form the second connection structure 1121b, so that the second pole tab 112b has a higher integrity, which is conducive to the connection between the second pole tab 112b and the second adapter 14b, and also facilitates the conduction between the second pole tab 112b and the second adapter 14b.

[0200] Based on the above structure, in the process of conductively connecting the second pole ear 112b and the second adapter 14b, the multiple second sub-pole ears of the second pole ear 112b can be connected to form a second connection structure 1121b, and then the second connection structure 1121b can be connected to the second position 1402 of the second adapter 14b to form a conductive connection between the second connection structure 1121b and the second adapter 14b.

[0201] The second pole tab 112b is connected to form a second connection structure 1121b through a plurality of second sub-pole tabs, and then the second connection structure 1121b is conductively connected to the second position 1402, so that the second pole tab 112b can be better conductively connected to the second adapter 14b.

[0202] In some embodiments, the second sub-tabs of the second tab 112b are welded to form the second connection structure 1121b, that is, the second sub-tabs of the second tab 112b are pre-welded to form the second connection structure 1121b.

[0203] In some embodiments, the second tab 112b can be pre-welded by ultrasonic welding to form the second connection structure 1121b, and the second connection structure 1121b can be laser welded to the second position 1402 of the second adapter 14b. Of course, the second tab 112b can be pre-connected by other means, and the second connection structure 1121b and the second adapter 14b can also be conductively connected by other means.

[0204] In some embodiments, when a plurality of second sub-electrode tabs of the second electrode tab 112b are connected to form the second connection structure 1121b, they can also be simultaneously connected to the second adapter 14b. In this way, the connection strength between the second electrode tab 112b and the second adapter 14b can be improved, which helps to improve the conduction stability of the second electrode tab 112b and the second adapter 14b.

[0205] In some embodiments, Figure 7 As shown, the second heat insulating member 152 is disposed away from the second connection structure 1121b. Specifically, the second heat insulating member 152 is disposed away from the projection of the second connection structure 1121b on the side of the second adapter 14b facing the main body 111.

[0206] In this way, on the basis that the heat insulation structure 15 can slow down the heat conduction between the second adapter 14 b and the main body 111 , the arrangement of the heat insulation structure 15 can be reduced.

[0207] In some embodiments, see Figure 7 , and in combination with other drawings. The plurality of second sub-electrode tabs of the second electrode tab 112 b are connected to form a plurality of second connection structures 1121 b that are spaced apart, and each second connection structure 1121 b is connected to a corresponding second position 1402 .

[0208] A plurality of second sub-pole ears of the second pole ear 112b are connected to form a plurality of second connection structures 1121b, so that each second connection structure 1121b is connected to each second position 1402 of the second adapter 14b, so that the current between the second adapter 14b and the second pole ear 112b can be more evenly distributed, thereby reducing the overcurrent temperature of the second adapter 14b, thereby reducing the risk of internal short circuit of the battery cell 10 caused by melting of the diaphragm.

[0209] In some embodiments, please refer to Figure 3 , Figure 6 and Figure 7 , and in combination with other drawings, the areas of all the second positions 1402 of the second adapter 14 b account for 10% to 25% of the area of ​​the side of the second adapter 14 b facing the main body 111 .

[0210] It can be understood that the second position 1402 is located on the side of the second adapter 14b facing the main body 111. The area of ​​the second position 1402 accounts for 11%, 12%, 15%, 16%, 18%, 20%, 21%, 22%, 24%, etc. of the area of ​​the side of the second adapter 14b facing the main body 111.

[0211] Such a configuration allows the second position 1402 to have a more suitable area, that is, the projection of the connection trace between the second pole tab 112b and the second adapter 14b on the second adapter 14b has a more suitable area. In this way, the connection position between the second adapter 14b and the second pole tab 112b has a greater current capacity, and when the second adapter 14b is normally flowing, the second adapter 14b can be placed in a lower temperature environment, which can reduce the risk of the diaphragm of the main body 111 being melted. In addition, the second adapter 14b can also reserve a certain position to set the fuse area, so that the fuse area is effectively fused when the second adapter 14b is short-circuited.

[0212] In some embodiments, Figure 3 and Figure 6 As shown, the second adapter 14b may also be provided with the above-mentioned positioning through hole to position the second electrode terminal 13b, so as to facilitate the conductive connection between the second electrode terminal 13b and the second adapter 14b. Among them, the positioning through hole on the second adapter 14b is the second positioning through hole 1404. In addition, the side of the second electrode terminal 13b facing the main body 111 may also be provided with a heat insulation structure 15, and the details may refer to the relevant description of the above-mentioned first positioning through hole 1403, which will not be repeated here one by one.

[0213] In some embodiments, see Figure 3 , and in combination with other drawings. The battery cell 10 also includes a shell 12, and the electrode assembly 11, the first adapter 14a, the second adapter 14b and the heat insulation structure 15 are all arranged in the shell 12. The first pole ear 112a and the second pole ear 112b are respectively arranged at the opposite ends of the main body 111 along the first direction Y. The shell 12 is provided with a first wall 122a and a second wall 122b at the opposite ends along the first direction Y, the first electrode terminal 13a is provided on the first wall 122a, and the second electrode terminal 13b is provided on the second wall 122b. In the first direction Y, the first adapter 14a is provided between the first wall 122a and the first pole ear 112a, and the second adapter 14b is provided between the second wall 122b and the second pole ear 112b.

[0214] It can be understood that the first adapter 14a, the first electrode terminal 13a and the first wall 122a are all arranged at one end of the electrode assembly 11 having the first pole tab 112a along the first direction Y, and the first adapter 14a is arranged between the first pole tab 112a and the first wall 122a along the first direction Y. Such an arrangement facilitates the first adapter 14a to be conductively connected to the first pole tab 112a and the first electrode terminal 13a.

[0215] The second adapter 14b, the second electrode terminal 13b and the second wall 122b are all arranged at one end of the electrode assembly having the second pole tab 112b along the first direction Y, and the second adapter 14b is arranged between the second pole tab 112b and the second wall 122b along the first direction Y. Such arrangement facilitates the second adapter 14a to be conductively connected to the second pole tab 112b and the second electrode terminal 13b.

[0216] By adopting the above technical solution, the overall layout of the battery cell 10 is more reasonable.

[0217] Based on the above ideas, please refer to Figure 2 The embodiment of the present application further provides a battery 100, which includes a battery cell 10. The battery cell 10 in this embodiment is the same as the battery cell 10 in the previous embodiment. For details, please refer to the relevant description of the battery cell 10 in the previous embodiment, which will not be repeated here.

[0218] The battery 100 provided in the embodiment of the present application can improve the problem of melting of the separator of the battery cell 10 by adopting the battery cell 10 involved above, thereby reducing the risk of short circuit of the battery 100.

[0219] Based on the above ideas, please refer to Figure 1 The embodiment of the present application further provides an electric device, which includes a battery cell 10 or a battery 100. The battery cell 10 and the battery 100 in this embodiment are the same as the battery cell 10 and the battery 100 in the previous embodiment. For details, please refer to the relevant description of the battery cell 10 and the battery 100 in the previous embodiment, which will not be repeated here.

[0220] The electrical device provided in the embodiment of the present application can improve the problem of diaphragm melting of the battery cell 10 by adopting the battery cell 10 or the battery 100 involved above, thereby reducing the risk of short circuit of the battery 100.

[0221] As one of the embodiments of this application, Figures 3 to 7As shown, the battery cell 10 includes an electrode assembly 11, a first electrode terminal 13a, a second electrode terminal 13b, a first adapter 14a, a second adapter 14b and a first thermal insulator 151. The electrode assembly 11 includes a main body 111, a first pole tab 112a and a second pole tab 112b, and the first pole tab 112a and the second pole tab 112b are arranged at one end or two opposite ends of the main body 111 along the first direction Y. The first adapter 14a is welded to the first electrode terminal 13a, and the first adapter 14a is welded to the first pole tab 112a. The second adapter 14b is welded to the second electrode terminal 13b, and the second adapter 14b is welded to the second pole tab 112b. The first thermal insulator 151 is arranged on the side of the first adapter 14a facing the main body 111 along the first direction Y. The first thermal insulator 151 avoids the welding marks of the first pole tab 112a and the first adapter 14a. The first electrode tab 112a is welded to the first adapter 14a to form a plurality of weld marks distributed at intervals. The second electrode tab 112b is welded to the second adapter 14b to form a plurality of weld marks, and at least a portion of the second electrode terminal 13b is located between the plurality of weld marks.

[0222] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A battery cell (10), wherein: include: An electrode assembly (11) comprises a main body (111) and a first electrode tab (112a) provided on the main body (111); A first electrode terminal (13a); A first adapter (14a) conductively connected to the first electrode tab (112a) and the first electrode terminal (13a); The heat insulation structure (15) is at least partially disposed on a side of the first adapter (14a) facing the main body (111).

2. The battery cell (10) according to claim 1, wherein: The thermal conductivity of the thermal insulation structure (15) is ≤0.7 W / m·K.

3. The battery cell (10) according to claim 1 or 2, wherein: The heat insulation structure (15) has insulating properties.

4. The battery cell (10) according to any one of claims 1 to 3, wherein: The thermal insulation structure (15) comprises one or more of a copolymer of perfluoropropyl vinyl ether and polytetrafluoroethylene, mica, ceramics, glass fiber, carbon fiber, carbon-carbon composite material or pre-oxidized silk aerogel.

5. The battery cell (10) according to any one of claims 1 to 4, wherein: The heat insulation structure (15) is a coating layer.

6. The battery cell (10) according to any one of claims 1 to 5, wherein: The first adapter (14a) is provided with a first position (1401), the first pole ear (112a) is connected to the first position (1401), and the heat insulation structure (15) is arranged to avoid the first position (1401).

7. The battery cell (10) according to claim 6, wherein: The first adapter (14a) is provided with a plurality of first positions (1401) distributed at intervals, and the first pole lug (112a) is connected to the plurality of first positions (1401).

8. The battery cell (10) according to claim 6 or 7, wherein: The battery cell (10) further comprises a shell (12), wherein the electrode assembly (11), the first adapter (14a) and the heat insulation structure (15) are all arranged in the shell (12); the shell (12) is provided with a liquid injection hole (1201), and the first position (1401) is located on a side of the first electrode terminal (13a) away from the liquid injection hole (1201).

9. The battery cell (10) according to claim 8, wherein: The housing (12) is provided with a first wall (122a), and the liquid injection hole (1201) and the first electrode terminal (13a) are spaced apart from each other on the first wall (122a).

10. The battery cell (10) according to any one of claims 6 to 9, wherein: The first pole lug (112a) includes a plurality of first sub-pole lugs, and the plurality of first sub-pole lugs are connected to form a first connection structure (1121a), and at least a portion of the first connection structure (1121a) is connected to the first position (1401).

11. The battery cell (10) according to any one of claims 6 to 10, wherein: The area of ​​all the first positions (1401) accounts for 10% to 25% of the area of ​​the side of the first adapter (14a) facing the main body (111).

12. The battery cell (10) according to any one of claims 1 to 11, wherein: The first adapter (14a) is provided with a positioning through hole (1403), the first electrode terminal (13a) is inserted into the positioning through hole (1403), and part of the heat insulation structure (15) is provided on a side of the first electrode terminal (13a) facing the main body (111).

13. The battery cell (10) according to any one of claims 1 to 12, wherein: The electrode assembly (11) further comprises a second pole lug (112b) provided on the main body (111); the battery cell (10) further comprises a second electrode terminal (13b) and a second adapter (14b), wherein the second adapter (14b) is conductively connected to the second pole lug (112b) and the second electrode terminal (13b).

14. The battery cell (10) according to claim 13, wherein: The first pole lug (112a) is a positive pole lug, and the second pole lug (112b) is a negative pole lug.

15. The battery cell (10) according to claim 13 or 14, wherein: Part of the heat insulation structure (15) is arranged on a side of the second adapter (14b) facing the main body (111).

16. The battery cell (10) according to any one of claims 13 to 15, wherein: The second adapter (14b) is provided with a second position (1402), the second pole ear (112b) is connected to the second position (1402), and the heat insulation structure (15) is arranged to avoid the second position (1402).

17. The battery cell (10) according to claim 16, wherein: The second adapter (14b) is provided with a plurality of second positions (1402) distributed at intervals, and the second pole tab (112b) is connected to the plurality of second positions (1402).

18. The battery cell (10) according to claim 17, wherein: At least a portion of the second electrode terminal (13b) is located between the two second locations (1402).

19. The battery cell (10) according to any one of claims 16 to 18, wherein: The second pole tab (112b) includes a plurality of second sub-pole tabs, and the plurality of second sub-pole tabs are connected to form a second connection structure (1121b), and at least a portion of the second connection structure (1121b) is connected to the second position (1402).

20. The battery cell (10) according to claim 19, wherein: A plurality of the second sub-electrode ears are connected to form a plurality of the second connection structures (1121b) distributed at intervals, and each of the second connection structures (1121b) is connected to a corresponding second position (1402).

21. The battery cell (10) according to any one of claims 16 to 20, wherein: The area of ​​all the second positions (1402) accounts for 10% to 25% of the area of ​​the side of the second adapter (14b) facing the main body (111).

22. The battery cell (10) according to any one of claims 13 to 21, wherein: The battery cell (10) further comprises a housing (12), wherein the electrode assembly (11), the first adapter (14a), the second adapter (14b) and the heat insulation structure (15) are all arranged in the housing (12); The first pole lug (112a) and the second pole lug (112b) are respectively arranged at the opposite ends of the main body (111) along the first direction (Y); the shell (12) is respectively provided with a first wall (122a) and a second wall (122b) at the opposite ends along the first direction (Y); the first electrode terminal (13a) is arranged on the first wall (122a), and the second electrode terminal (13b) is arranged on the second wall (122b); along the first direction (Y), the first adapter (14a) is arranged between the first wall (122a) and the first pole lug (112a), and the second adapter (14b) is arranged between the second wall (122b) and the second pole lug (112b).

23. A battery (100), wherein: Comprising a battery cell (10) according to any one of claims 1 to 22.

24. An electrical device, wherein: Comprising the battery cell (10) according to any one of claims 1 to 22; or comprising the battery (100) according to claim 23.

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