WO2023087196A1

WO2023087196A1 - Battery, electronic apparatus, and preparation method and manufacturing system for battery

Info

Publication number: WO2023087196A1
Application number: PCT/CN2021/131382
Authority: WO
Inventors: 李兴星; 陈志明; 黄小腾; 王鹏
Original assignee: 宁德时代新能源科技股份有限公司
Priority date: 2021-11-18
Filing date: 2021-11-18
Publication date: 2023-05-25
Also published as: CN116783759A

Abstract

Embodiments of the present application provide a battery, an electronic apparatus, and a preparation method and manufacturing system for a battery. The battery comprises a heating member and at least one battery module, the battery module(s) comprising a plurality of battery cells arranged side-by-side in a first direction, and the battery cells being stacked on one another by means of a first sidewall; the heating member is used for heating the battery module(s); the heating member comprises a heating part and a fixing part, the fixing part is located at at least one end of the heating part in the first direction, the fixing part is used for fixing the heating part to a second sidewall of a battery cell, and the heating part abuts against the second sidewall of the battery cell. The battery provided by the present application is highly safe.

Description

Battery, electrical device, battery manufacturing method and manufacturing system

technical field

The present application relates to the technical field of energy storage devices, and in particular to a battery, an electrical device, a battery preparation method and a manufacturing system.

Background technique

With the development of new energy technology, the application of batteries is becoming more and more extensive. When the battery temperature is within a certain range, the charging and discharging performance of the battery is better. When the battery is in a high-temperature environment, the battery needs to be cooled by a cooling device, and when the battery is in a low-temperature environment, the battery needs to be heated by a heating device to obtain better charge and discharge performance. However, most of the related technologies pay more attention to the cooling of the battery, and less research on the heating of the battery.

Contents of the invention

The embodiment of the present application provides a battery, an electrical device, and a battery manufacturing method and manufacturing system. By setting the heating element in contact with the battery cell, the battery cell is heated when necessary, and the charge and discharge performance of the battery is improved. and security.

In a first aspect, the present application provides a battery, including a heating element and at least one battery module, the battery module includes a plurality of battery cells arranged side by side along a first direction, and the battery cells are stacked on each other through the first side wall; the heating element Used to heat the battery module; wherein the heating element includes a heating part and a fixing part, the fixing part is located at least one end of the heating part along the first direction, and the fixing part is used to fix the heating part to the second side wall of the battery cell, The heating part is pressed against the second side wall.

In the above solution, the heating element provided can heat the battery cell to increase the temperature of the battery cell to a suitable working temperature to ensure the charging and discharging performance of the battery; by setting the fixing part to fix the heating part on the second side wall, the heating part There is no need to stick and connect with the battery cell, so as to avoid the heating part being torn and damaged during the assembly and sticking process or during the use of the battery; by setting the heating part to press against the second side wall, the heat generated by the heating part can be directly conducted to the The battery cell improves the thermal energy transfer rate, and at the same time avoids the phenomenon of dry burning of the heating part caused by the separation of the heating part and the battery cell, and improves the safety of the battery.

In some embodiments, the heating part includes a heating pad and a plurality of thermally conductive sheets protruding from at least one side of the heating pad, the plurality of thermally conductive sheets are arranged between the battery cells and the heating pad, and the thermally conductive sheets are configured to be elastically deformable and Press against the battery cell to conduct heat between the heating pad and the battery cell.

In the above solution, on the one hand, the thermal conductivity of the heat conduction sheet is used to conduct the heat energy emitted by the heating pad to the battery cell; Due to the expansion and deformation of the cell during use, the heating element can keep in contact with the battery cell and conduct direct heat conduction, avoiding dry burning of the heating part and improving the safety of the battery.

In some embodiments, there are at least two battery modules, and the heating element is disposed between adjacent battery modules. That is, two battery modules can be heated by one heating element, which improves battery assembly efficiency and reduces the complexity of circuit layout in the battery.

In some embodiments, a plurality of heat conducting sheets are arranged on opposite sides of the heating pad, and the heat conducting sheets arranged on both sides of the heating pad are respectively in contact with two adjacent battery modules. By arranging heat conduction sheets on both sides of the heating pad, the heating element can contact and transfer heat to different battery modules through the heat conduction sheets located on both sides of the heating pad, thereby improving heat conduction efficiency.

In some embodiments, the battery module further includes a side plate disposed opposite to the plurality of battery cells, and the heating element is pressed between the side plate and the battery module. The side plate has a certain hardness, so that the battery cells can be protected through the side plate, and pressure can be evenly applied to the heating element through the side plate, so that the heating element can be pressed between the side plate and the battery module to ensure that the heat conduction sheet access to the battery cells.

In some embodiments, the fixing part is located on both sides of the heating part along the first direction, and is fixed to the battery module by bolts. The fixing part and the battery module are fixed by bolts, which ensures that the relative position of the heating element and the battery module is stable and the connection is firm.

In some embodiments, the battery module further includes two end plates, the two end plates are respectively located on both sides of the plurality of battery cells along the first direction, and the fixing portion is respectively connected to the two end plates. The fixing part is fixedly connected with the two end plates, which realizes the connection between the heating element and the battery module, and at the same time saves setting other installation structures in the battery module for the connection of the fixing part, thereby reducing the production cost.

In some embodiments, the battery module further includes a first strap and a second strap surrounding the plurality of battery cells and the end plates, the first strap and the second strap are oppositely arranged and clamp the plurality of battery cells, The heating element is arranged between the first strap and the second strap.

The first cable tie and the second cable tie can tighten multiple battery cells from both ends of the battery cell to ensure that the multiple battery cells in the battery module do not shake; the heating element is arranged between the first cable tie and the battery cell. Between the second straps, avoid the interval between the first strap and the second strap between the battery cell and the heating element, which will affect the heating of the battery cell by the heating element.

In some embodiments, the heating pad includes a heating circuit layer and an insulating and heat-conducting layer covering the heating circuit layer, and the heating circuit layer includes a heating circuit that is bent back and forth. The insulating and heat-conducting layer can ensure the insulation between the heating circuit layer and the battery cell, which is beneficial to the work of the battery cell.

In some embodiments, a connection portion is formed between adjacent battery cells of the battery module. Along the first direction, the heating pad includes a plurality of main heating areas arranged at intervals, and a secondary heating area connecting two adjacent main heating areas, The auxiliary heating area is arranged facing the connecting portion, and the distribution density of the heating circuits in the main heating area is higher than that in the auxiliary heating area. By setting the main heating area and the auxiliary heating area, the heating capacity of the heating element to the battery module is different from each other, and the heat energy emitted by the heating element is directly transmitted to the battery cell as much as possible, so as to improve the effective utilization of the heat energy emitted by the heating element Rate.

In some embodiments, the heating pad includes a middle heating zone and an end heating zone, the end heating zones are located at both ends of the middle heating zone along the first direction, and the distribution density of the heating circuits in the middle heating zone is lower than that in the end heating zone. distribution density. The heat energy at both ends of the battery module is easier to dissipate to the external environment than the heat energy in the battery module. By setting the distribution density of the middle heating zone lower than the distribution density of the end heating zone, the heat energy generated by the middle heating zone is less than that of the end heating zone per unit time. The thermal energy of the inner heating area can be used to balance the temperature increase rate of the battery module.

In some embodiments, there are multiple heating circuits, the multiple heating circuits are connected in parallel, and the multiple heating circuits are coiled in parallel in sequence in the same plane. Multiple heating circuits are connected in parallel, so that the on-off of each heating circuit can be controlled separately, and the battery cells can be heated with different powers.

In some embodiments, the material of the insulating heat conducting layer and/or the heat conducting sheet is silica gel, so that the insulating heat conducting layer or the heat conducting sheet has insulation, heat conductivity and flexibility at the same time.

According to a second aspect, the present application provides an electrical device, including the battery according to any embodiment of the first aspect, and the battery is used to provide electrical energy.

In a third aspect, according to the present application, a method for manufacturing a battery is provided, including:

At least one battery module is provided, the battery module includes a plurality of battery cells arranged side by side along a first direction, and the battery cells are stacked on each other through the first side wall;

A heating element is provided, the heating element includes a heating part and a fixing part, and the fixing part is located at at least one end of the heating part along the first direction;

Installing the fixing part to fix the heating part to the second side wall of the battery cell, so that the heating part presses against the second side wall;

Wherein, the heating element is used to heat the battery module.

In a fourth aspect, a battery manufacturing system includes:

The first providing device is used to provide at least one battery module, the battery module includes a plurality of battery cells arranged side by side along the first direction, and the battery cells are stacked on each other through the first side wall;

The second providing device is used to provide a heating element, the heating element includes a heating part and a fixing part, and the fixing part is located at at least one end of the heating part along the first direction;

an assembly device, used for installing the fixing part, so as to fix the heating part on the second side wall of the battery cell, so that the heating part presses against the second side wall;

Wherein, the heating element is used to heat the battery module.

The above description is only an overview of the technical solution of the present application. In order to better understand the technical means of the present application, it can be implemented according to the contents of the description, and in order to make the above and other purposes, features and advantages of the present application more obvious and understandable , the following specifically cites the specific implementation manner of the present application.

Description of drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the accompanying drawings that need to be used in the embodiments of the present application. Obviously, the accompanying drawings described below are only some embodiments of the present application. Those of ordinary skill in the art can also obtain other drawings based on the accompanying drawings on the premise of not paying creative efforts.

FIG. 1 is a schematic structural view of a vehicle in some embodiments of the present application;

FIG. 2 is a schematic diagram of an exploded structure of a battery in some embodiments of the present application;

3 is a schematic diagram of an exploded structure of a battery cell in some embodiments of the present application;

Figure 4 is a schematic plan view of an exploded structure of a battery in some embodiments of the present application

Fig. 5 is a schematic diagram of an enlarged structure of part A shown in Fig. 4;

6 is a schematic plan view of a partial structure of a battery in some embodiments of the present application;

FIG. 7 is a perspective schematic diagram of an exploded structure of a battery in some embodiments of the present application;

Fig. 8 is a schematic diagram of an enlarged structure of part B shown in Fig. 7;

FIG. 9 is a schematic perspective view of an exploded structure of batteries according to other embodiments of the present application;

Fig. 10 is a schematic diagram of an enlarged structure of part C shown in Fig. 10;

FIG. 11 is a schematic diagram of the distribution structure of conductive circuits in some embodiments of the present application;

FIG. 12 is a schematic diagram of the distribution structure of conductive circuits in other embodiments of the present application;

Fig. 13 is a schematic flowchart of a battery manufacturing method provided by some embodiments of the present application;

Fig. 14 is a schematic block diagram of a battery manufacturing system provided by some embodiments of the present application.

In the drawings, the drawings are not drawn to scale.

Mark Description:

Vehicle 1000; battery 100; controller 200; motor 300; upper cover 301; lower cover 302;

battery module 10; battery cell 1; end cover 101; casing 102; first side wall 102a; second side wall 102b; electrode assembly 103; electrode terminal 101a; side plate 4; end plate 5; first cable tie 6; The second cable tie 7;

Heating element 20; heating part 2; heating pad 21; heating circuit layer 211; heating circuit 211a; insulating and heat-conducting layer 212; main heating area 21a; ; fixed part 3; mounting pad 81; mounting shell 82; wire 83; mounting hole 84; electrical connector 85;

Manufacturing system 30 ; first providing device 31 ; second providing device 32 ; assembling device 33 .

Detailed ways

The implementation manner of the present application will be further described in detail below with reference to the drawings and embodiments. The detailed description and drawings of the following embodiments are used to illustrate the principles of the application, but not to limit the scope of the application, that is, the application is not limited to the described embodiments.

In the description of this application, it should be noted that, unless otherwise specified, the meaning of "plurality" is more than two; the terms "upper", "lower", "left", "right", "inner", " The orientation or positional relationship indicated by "outside" and so on are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a reference to this application. Application Restrictions. In addition, the terms "first", "second", "third", etc. are used for descriptive purposes only and should not be construed as indicating or implying relative importance. "Vertical" is not strictly vertical, but within the allowable range of error. "Parallel" is not strictly parallel, but within the allowable range of error.

The orientation words appearing in the following description are the directions shown in the figure, and do not limit the specific structure of the application. In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be interpreted in a broad sense, for example, it can be a fixed connection or a flexible connection. Disassembled connection, or integral connection; it can be directly connected or indirectly connected through an intermediary. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific situations.

In the present application, the battery cells may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, which are not limited in the embodiments of the present application. The battery cell can be in the form of a cylinder, a flat body, a cuboid or other shapes, which is not limited in this embodiment of the present application. Battery cells are generally divided into three types according to packaging methods: cylindrical battery cells, square square battery cells and pouch battery cells, which are not limited in this embodiment of the present application.

The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity. For example, the battery mentioned in this application may include a battery module or a battery pack, and the like. Batteries generally include a case for enclosing one or more battery cells. The box can prevent liquid or other foreign objects from affecting the charging or discharging of the battery cells.

The battery cell includes an electrode assembly and an electrolyte, and the electrode assembly is composed of a positive electrode sheet, a negative electrode sheet, and a separator. A battery cell works primarily by moving metal ions between the positive and negative plates. The positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer. The positive electrode active material layer is coated on the surface of the positive electrode current collector. The current collector not coated with the positive electrode active material layer protrudes from the current collector coated with the positive electrode active material layer. The current collector coated with the positive electrode active material layer is stacked as the positive electrode tab. Taking a lithium-ion battery as an example, the material of the positive electrode current collector can be aluminum, and the positive electrode active material can be lithium cobaltate, lithium iron phosphate, ternary lithium or lithium manganate. The negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer. The negative electrode active material layer is coated on the surface of the negative electrode current collector. The current collector without the negative electrode active material layer protrudes from the current collector coated with the negative electrode active material layer. The current collector coated with the negative electrode active material layer is stacked as the negative electrode tab. The material of the negative electrode current collector may be copper, and the negative electrode active material may be carbon or silicon. The material of the isolation film may be PP (polypropylene, polypropylene) or PE (polyethylene, polyethylene). In addition, the electrode assembly may be a wound structure or a laminated structure, which is not limited in the embodiment of the present application.

In a low temperature environment, the charge and discharge performance of the battery will be affected, especially for high-voltage power batteries, so when the battery is in a low temperature environment, it is necessary to heat the battery to obtain good electrical performance. The structure of the battery and the use environment were analyzed and studied. The inventor found that the insulating heating film can be made of polyimide-coated heating circuit, and the insulating heating film can be pasted on the battery to ensure the insulation and heating. The thermal energy emitted by the membrane can be conducted directly to the battery. However, it was found during use that the heating film may fall off from the battery due to battery expansion, external force, etc., causing the heating film to dry-burn. Dry-burning will cause the heating film to fail or cause safety problems. In addition, the heating film made of polyimide is relatively thin, and it is easy to be damaged in the process of preparation, assembly and use, so that the stability of the battery is not high.

Based on the above problems discovered by the applicant, the applicant has improved the structure of the battery. The technical solutions described in the embodiments of the present application are applicable to batteries including battery cells and electric devices using batteries.

Electric devices can be vehicles, mobile phones, portable devices, notebook computers, ships, spacecraft, electric toys and electric tools, and so on. Vehicles can be fuel vehicles, gas vehicles or new energy vehicles, and new energy vehicles can be pure electric vehicles, hybrid vehicles or extended-range vehicles; spacecraft include airplanes, rockets, space shuttles and spacecraft, etc.; electric toys include fixed Type or mobile electric toys, such as game consoles, electric car toys, electric boat toys and electric airplane toys, etc.; electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools and railway electric tools, for example, Electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, electric planers, and more. The embodiments of the present application do not impose special limitations on the above-mentioned electrical devices.

In the following embodiments, for the convenience of description, a vehicle 1000 as an electric device according to an embodiment of the present application is taken as an example for description.

Please refer to FIG. 1 , which is a schematic structural diagram of a vehicle provided by some embodiments of the present application. The vehicle 1000 can be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle. The interior of the vehicle 1000 is provided with a battery 100 , and the battery 100 may be provided at the bottom, head or tail of the vehicle 1000 . The battery 100 can be used for power supply of the vehicle 1000 , for example, the battery 100 can be used as an operating power source of the vehicle 1000 . The vehicle 1000 may further include a controller 200 and a motor 300 , the controller 200 is used to control the battery 100 to supply power to the motor 300 , for example, for starting, navigating and running the vehicle 1000 .

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

Fig. 2 is an exploded view of a battery provided by some embodiments of the present application. Referring to FIG. 2 , the battery 100 includes a case (not shown) and a battery cell 1 . In some embodiments, the box body may include an upper cover 301 and a lower cover 302 , the upper cover 301 and the lower cover 302 cover each other, and the upper cover 301 and the lower cover 302 jointly define an accommodating space for accommodating the battery cell 1 . The lower cover 302 can be a hollow structure with one end open, and the upper cover 301 can be a plate-shaped structure, and the upper cover 301 covers the opening side of the lower cover 302, so that the upper cover 301 and the lower cover 302 jointly define an accommodation space; 301 and the lower cover 302 can also be hollow structures with one side opening, and the opening side of the upper cover 301 is closed to the opening side of the lower cover 302 . Certainly, the box body formed by the upper cover 301 and the lower cover 302 may be in various shapes, such as a cylinder, a cuboid, and the like.

In the battery 100 , there may be multiple battery cells 1 , and the multiple battery cells 1 may be connected in series or in parallel or mixed. The mixed connection means that the multiple battery cells 1 are connected in series and in parallel. A plurality of battery cells 1 can be directly connected in series, parallel or mixed together, and then the whole composed of a plurality of battery cells 1 is housed in the box; of course, the battery 100 can also be a plurality of battery cells 1 connected in series first Either connected in parallel or in series to form battery modules 10 , and multiple battery modules 10 are connected in series or in parallel or in series to form a whole and accommodated in the box. The battery 100 may also include other structures, for example, the battery 100 may also include a current flow component for realizing electrical connection between multiple battery cells 1 .

Wherein, each battery cell 1 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery, but is not limited thereto. The battery cell 1 can be in the form of a cylinder, a flat body, a cuboid or other shapes.

Please refer to FIG. 3 , which is a schematic diagram of an exploded structure of a battery cell provided in some embodiments of the present application. A battery cell 1 refers to the smallest unit that makes up a battery. The battery cell 1 includes an end cap 101 , a casing 102 , an electrode assembly 103 and other functional components.

The end cap 101 refers to a component that covers the opening of the casing 102 to isolate the internal environment of the battery cell 1 from the external environment. Without limitation, the shape of the end cap 101 can be adapted to the shape of the housing 102 to fit the housing 102 . Optionally, the end cap 101 can be made of a material (such as aluminum alloy) with a certain hardness and strength, so that the end cap 101 is not easily deformed when being squeezed and collided, so that the battery cell 1 can have a higher Structural strength and safety performance can also be improved. Functional components such as electrode terminals 101 a may be provided on the end cap 101 . The electrode terminal 101 a can be used for electrical connection with the electrode assembly 103 for outputting or inputting electric energy of the battery cell 1 . In some embodiments, the end cover 101 may also be provided with a pressure relief mechanism for releasing the internal pressure when the internal pressure or temperature of the battery cell 1 reaches a threshold value. The material of the end cap 101 may also be various, for example, copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which is not particularly limited in this embodiment of the present application. In some embodiments, an insulator can be provided inside the end cover 101 , and the insulator can be used to isolate the electrical connection components in the housing 102 from the end cover 101 to reduce the risk of short circuit. Exemplarily, the insulating member may be plastic, rubber or the like.

The casing 102 is a component used to cooperate with the end cap 101 to form the internal environment of the battery cell 1 , wherein the formed internal environment can be used to accommodate the electrode assembly 103 , electrolyte and other components. The shell 102 and the end cover 101 can be independent components, and an opening can be provided on the shell 102 , and the internal environment of the battery cell 1 can be formed by making the end cover 101 cover the opening at the opening. Without limitation, the end cover 101 and the housing 102 can also be integrated. Specifically, the end cover 101 and the housing 102 can form a common connection surface before other components are put into the housing. When the inside of the housing 102 needs to be encapsulated, then Make the end cap 101 cover the housing 102 . The housing 102 can be in various shapes and sizes, such as cuboid, cylinder, hexagonal prism and so on. Specifically, the shape of the casing 102 may be determined according to the specific shape and size of the electrode assembly 103 . The housing 102 can be made of various materials, for example, copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which are not particularly limited in this embodiment of the present application.

The electrode assembly 103 is a part where the electrochemical reaction occurs in the battery cell 1 . One or more electrode assemblies 103 may be contained within the casing 102 . The electrode assembly 103 is mainly formed by winding or stacking a positive electrode sheet and a negative electrode sheet, and a separator is usually provided between the positive electrode sheet and the negative electrode sheet. The parts of the positive electrode sheet and the negative electrode sheet with the active material constitute the main body of the electrode assembly 103, and the parts of the positive electrode sheet and the negative electrode sheet without the active material respectively constitute tabs. The positive pole tab and the negative pole tab can be located at one end of the main body together or at both ends of the main body. During the charging and discharging process of the battery, the positive electrode active material and the negative electrode active material react with the electrolyte, and the tabs are connected to the electrode terminal 101a to form a current loop.

According to some embodiments of the present application, please refer to FIG. 4 and FIG. 5 together. The present application provides a battery 100 including a heating element 20 and at least one battery module 10 . The battery module 10 includes a plurality of battery cells 1 arranged side by side along the first direction X, and the battery cells 1 are stacked on each other through the first side wall 102a. The heating element 20 is used to heat the battery module 10 . Wherein, the heating element 20 includes a heating part 2 and a fixing part 3, the fixing part 3 is located at at least one end of the heating part 2 along the first direction X, and the fixing part 3 is used to fix the heating part 2 to the second side wall of the battery cell 1 102b , so that the heating part 2 presses against the second side wall 102b of the battery cell 1 .

The battery cell 1 includes multiple walls. In a battery module 10, the second side wall 102b can be any wall of the battery cell 1 that is not opposite to other battery cells 1, so that the second side wall 102b can be exposed and In contact with heating part 2. In one embodiment, the battery cell 1 includes two opposite first side walls 102a, two opposite second side walls 102b, and opposite top and bottom surfaces, wherein the first side walls 102a The area is larger than the area of the second side wall 102b, and the exposed electrode terminal 101a is provided on the top surface. A plurality of battery cells 1 are stacked in sequence along a first direction X, the first direction X may specifically be a width direction of the battery cells 1 , and the first side wall 102a is perpendicular to the width direction. The heating part 2 is used to heat the second side wall 102b of the battery cell 1, the heating element 20 can be arranged opposite to the battery module 10 along the second direction Y, and the heating element 20 can be arranged along the width direction of the battery cell 1, thereby heating The member 20 can be in contact with multiple second side walls 102b at the same time to heat multiple battery cells 1 .

The heating part 2 can be adapted to the shape and size of the second side walls 102b of the plurality of battery cells 1 in the battery module 10 . The second side wall 102b of each battery cell 1 forms the side of the module in the same plane, the size of the heating part 2 can be larger than the side of the module, and the part of the heating part 2 larger than the side of the module can protrude from the battery module 10, or can Attached to the top surface or the first side wall 102a by bending. The size of the heating part 2 can also be smaller than the side of the module, so as to avoid excessive bending of the heating part 2 . In order to ensure that each battery cell 1 in the battery module 10 can be heated by the heating element 20 , the length of the heating element 20 along the first direction X can be set according to the number of battery cells 1 in the battery module 10 . Optionally, the heating part 2 is in the shape of a rectangular plate, the width of the heating part 2 matches the height of the battery cells 1 , and the length of the heating part 2 matches the sum of the widths of multiple battery cells 1 .

The heating part 2 is a structure capable of dissipating heat to the outside, and the heating part 2 may specifically include a heating wire and a flexible insulating material coated on the outside of the heating wire. This structure makes the heating part 2 have a certain degree of flexibility, and the flexible insulating material can be insulating and heat-conducting materials such as polytetrafluoroethylene, silica gel, and carbon fiber. The heating wire generates heat after being energized, and the heat is conducted to the battery cell 1 which is in pressure contact with the heating part 2 through the flexible insulating material, thereby heating the battery cell 1 . In one embodiment, when the battery temperature sensor of the vehicle detects that the ambient temperature is lower than 5°C, the vehicle controls the heating element 20 to be energized, and the heating element 20 after power on heats the battery cell 1; when the battery 100 temperature sensor of the vehicle When it is detected that the ambient temperature is 25° C., the vehicle controls the heating element 20 to cut off the power, so as to control the heating element 20 to stop heating the battery cells 1 to prevent the temperature of the battery 100 from being too high.

The fixing part 3 can fix the heating part 2 on the second side wall 102b by means of welding, bonding, clamping and the like. The fixing part 3 can be directly connected to the battery module 10, or can be clamped between adjacent battery modules 10, and the relative position of the heating element 20 and the battery module 10 can be stabilized through the structure of the battery 100 box and bracket. The example does not limit which structure of the fixing part 3 is connected to the battery 100 in which way, so as to realize the fixing of the heating part 2 on the second side wall 102b.

When the fixing part 3 is only arranged at one end of the heating part 2, one end of the heating element 20 can be fixedly connected to the battery module 10 through the fixing part 3, and the other end of the heating element 20 can be fixed on the second side wall 102b by utilizing the hardness of the heating element 20 itself. Either the heating part 2 is pressed by other components in the battery 100 to realize the contact between the heating part 2 and the second side wall 102b, or a mounting groove structure matching the shape of the heating part 2 is provided on the battery module 10 , to realize that the heating part 2 abuts against the second side wall 102b. When the fixing part 3 is arranged at opposite ends of the heating part 2, both ends of the heating element 20 can be fixedly connected to the battery module 10 through the fixing part 3, and the two fixing parts 3 can define that the heating part 2 is abutting against the second side wall 102b. catch. When the battery cell 1 expands, since the heating portion 2 and the second side wall 102b are in pressure contact, the heating portion 2 can deform to a certain extent along with the battery cell 1, and the heating portion 2 can keep in contact with the battery cell 1. Contact, avoid heating part 2 dry burning.

In the above scheme, the heating element 20 provided can heat the battery cell 1 to increase the temperature of the battery cell 1 to a suitable working temperature, so as to ensure the charging and discharging performance of the battery 100; The side wall 102b, so that the heating part 2 and the battery cell 1 do not need to be glued and connected, and the heating part 2 is prevented from being torn and damaged during the assembly and sticking process or during the use of the battery 100; by setting the heating part 20 against the second side The wall 102b enables the heat energy generated by the heating element 20 to be directly conducted to the battery cell 1, thereby improving the heat transfer rate, and at the same time avoiding the phenomenon of dry burning of the heating portion 2 caused by the separation of the heating portion 2 from the battery cell 1, and improving the battery 100 security.

Please refer to FIG. 6 , the heating part 2 includes a heating pad 21 and a plurality of heat conducting sheets 22 protruding from at least one side of the heating pad 21 , the plurality of heat conducting sheets 22 are arranged between the battery cells 1 and the heating pad 21 , and the heat conducting sheets 22 is configured to be elastically deformable and press against the battery cell 1 to conduct heat between the heating pad 21 and the battery cell 1 .

The heating pad 21 can be a bendable flat plate, and when the heating pad 21 is subjected to an external force, the heating pad 21 can be bent to a certain extent. The heating pad 21 is electrically connected to an external circuit through the fixing part 3 , and the heating pad 21 can convert electric energy into thermal energy to dissipate heat outward.

The heat conducting sheet 22 can be a fin structure protruding from the heating pad 21 along the second direction Y, such as the embodiment shown in FIG. The width direction of the module 10 protrudes. The plurality of heat conducting sheets 22 may be distributed on the heating pad 21 in a straight strip, curved strip or other structures, and the application does not limit the structure of the heat conducting sheets 22 . The heat conducting sheets 22 can be evenly spaced on the heating pad 21 along the first direction X, or can be distributed in groups or unevenly. The heat conduction sheet 22 itself may have self-heating capability, that is, the heat conduction sheet 22 may be connected to an external circuit through the heating pad 21, and convert electric energy into heat energy after electrification. The heat conduction sheet 22 may also not have self-heating capability, that is, the heat conduction sheet 22 itself does not have the ability to convert electrical energy into heat energy, and is only used to conduct heat generated by the heating pad 21 to the battery cells 1 .

A plurality of heat conduction sheets 22 may be arranged in sequence relative to each other at intervals. In one embodiment, when the heat conduction sheet 22 is not assembled to the battery module 10 , the heat conduction sheet 22 is not deformed, the heat conduction sheet 22 protrudes from the heating pad 21 along the second direction Y, and the side surface of the adjacent heat conduction sheet 22 A containment space is formed between them. External force acts on the heating element 20, so that the heating part 2 is pressed against the second side wall 102b, and the heat conducting sheet 22 can be bent under the action of the external force, and the bent heat conducting sheet 22 extends along the first direction X and is accommodated in the accommodation space , the side of the bent heat conducting sheet 22 is in contact with the second side wall 102b.

In another embodiment, when the heat conduction sheet 22 is not assembled to the battery module 10 , the heat conduction sheet 22 is not deformed, and the heat conduction sheet 22 protrudes from the heating pad 21 along the second direction Y. The external force acts on the heating element 20, so that the heating part 2 is pressed against the second side wall 102b, and the heat conducting sheet 22 can be compressed along the second direction Y under the action of the external force, so that the end of the heat conducting sheet 22 is away from the heating pad 21 and the second side wall 102b. The side walls 102b are in contact.

Regardless of the deformation method of the heat conducting sheet 22 in the heating element 20, part of the heat generated by the heating pad 21 is directly heat-conducted through the contact between the heat conducting sheet 22 and the second side wall 102b, and the other part passes through the contact between the battery cell 1 and the heating element 20. The medium conducts indirect heat conduction. Specifically, the medium may be air, heat conduction glue, etc. The greater the thermal conductivity of the material conducting heat conduction between the heating element 20 and the battery cell 1 , the higher the heat conduction efficiency. In one embodiment, thermal conductive glue is coated on the heating element 20 , so that a part of the thermal energy generated by the heating element 20 can be conducted to the battery 100 through the thermal conductive glue, thereby increasing the heat conduction efficiency.

During the use of the battery 100, the battery cell 1 will gradually expand, so that the space between the battery cell 1 and the heating pad 21 will gradually decrease. Since the thermal conductive sheet 22 can be elastically deformed, the thermal conductive sheet 22 can be deformed to fit The space is reduced to ensure that the pressure contact state is maintained between the heating element 20 and the battery cell 1 . Therefore, in the above solution, on the one hand, the thermal conductivity of the thermal conductive sheet 22 is used to conduct the heat energy emitted by the heating pad 21 to the battery cell 1; 1 deformation, especially the expansion deformation of the battery cell 1 during use, the heating element 20 can keep in contact with the battery cell 1 and conduct heat conduction directly, avoiding dry burning of the heating part 2 and improving the safety of the battery 100 .

In some embodiments, the number of battery modules 10 is at least two, and the heating element 20 is disposed between adjacent battery modules 10 . In the embodiment shown in FIG. 4, the battery cells 1 in the battery module 10 are arranged side by side along the first direction X, that is, arranged side by side along the thickness direction of the battery cells 1, and the two battery modules 10 are arranged opposite to each other along the second direction Y. , that is, arranged side by side along the length direction of the battery cells 1 . One heating element 20 can directly heat the second side walls 102b of two adjacent battery modules 10 at the same time.

Therefore, by disposing the heating element 20 in the adjacent battery modules 10 , two battery modules 10 can be heated by one heating element 20 . Compared with the heating film pasted on each battery cell 1 in the prior art, only one heating element 20 needs to be installed between two battery modules 10 in this embodiment, which improves the assembly efficiency of the battery 100 and reduces the number of circuits in the battery 100. layout complexity.

In some embodiments, a plurality of heat conduction sheets 22 are disposed on opposite sides of the heating pad 21 , and the heat conduction sheets 22 disposed on both sides of the heat generation pad 21 are respectively in contact with two adjacent battery modules 10 . That is, between adjacent battery modules 10, the heat conducting sheet 22 on one side of the heating pad 21 can be bent to fit the gap between the battery module 10 and the heating pad 21, and the heat conducting sheet 22 on the other side of the heating pad 21 can Bend to fit the gap between the other battery module 10 and the heating pad 21 . By arranging heat conducting sheets 22 on both sides of the heating pad 21 , the heating element 20 can conduct heat directly to different battery modules 10 through the heat conducting sheets 22 on both sides of the heating pad 21 , thereby improving heat conduction efficiency.

Please refer to FIG. 7 and FIG. 8 , the battery module 10 further includes a side plate 4 . The side plate 4 is disposed opposite to the plurality of battery cells 1 . The heating element 20 is pressed between the side plate 4 and the battery module 10 .

The side plate 4 can cooperate with other parts to form a frame structure surrounding a plurality of battery cells 4 , and the side plate 4 is arranged opposite to the battery cells 1 along the second direction Y. For example, as shown in FIG. 7 , the side plate 4 is arranged opposite to the battery cell 1 along the width direction of the battery module 10 , and the side plate 4 is used to limit the movement of the battery cell 1 along the width direction of the battery module 10 . The side plate 4 has a certain hardness, so that the battery cell 1 can be protected by the side plate 4, and pressure can be evenly applied to the heating element 20 through the side plate 4, so that the heating element 20 can be pressed against the side plate 4 and the battery Between the modules 10 , ensure that the heat conducting sheet 22 can contact the battery cells 1 . The side plates 4 can be separately disposed on opposite sides of the plurality of battery cells 4 , so that the heat conducting sheet 22 can heat the battery cells 1 from opposite sides of the plurality of battery cells 4 . When a plurality of battery modules 10 are arranged side by side, the side plate 4 may not be provided between adjacent battery modules 10, and the adjacent battery modules 10 directly clamp the heating element 20, and the side plate 4 is only provided on a plurality of battery modules 10 arranged in a row. At this time, the heating element 20 located on both sides of the multiple battery modules 10 arranged in a row only needs to be provided with a heat conducting sheet 22 on the side close to the battery cell 1, and not provided on the side close to the side plate 4 The heat conducting sheet 22 is used so that the heating element 20 is only used to heat the battery cell 1 and not to heat the side plate 4 .

In some embodiments, the fixing part 3 is located at both ends of the heating part 2 along the first direction X, and is fixed to the battery module 10 by bolts. The fixing part 3 can be bolted to structures such as brackets and frames in the battery module 10 through a plurality of bolts. In the embodiment shown in Figure 8, the fixing part 3 includes a mounting pad 81 integrally formed with the heating part 2, a mounting shell 82 arranged on the mounting pad 81, a wire 83 at least partially accommodated in the mounting shell 82, and the mounting pad 81 It can be a structure without heat generation capability, that is, the mounting pad 81 does not contain a heating structure, and the mounting pad 81 and the heating part 2 are made of the same flexible insulating material to realize an integrated design, so that the difference in appearance between the fixing part 3 and the heating part 2 is small . The wire 83 is electrically connected to the circuit of the heating part 2 , and the mounting pad 81 is provided with mounting holes 84 through which bolts pass through. In another embodiment, a mounting hole 84 through which a bolt passes is provided on the mounting case 82 to connect the mounting case 82 and the battery module 10 .

The fixing part 3 and the battery module 10 are fixed by bolts, which ensures that the relative position of the heating element 20 and the battery module 10 is stable and the connection is firm.

In some embodiments, the battery module 10 further includes two end plates 5, the two end plates 5 are respectively located at both ends of the plurality of battery cells 1 along the first direction X, and the fixing part 3 is connected to the two end plates 5 respectively. .

The end plates 5 are located at both ends of the battery module 10 in the length direction and the end plates 2 are used to limit the movement of the battery cells 4 along the length direction of the battery module 10 . The side plates 4 and the end plates 5 can be connected end to end and surround a plurality of battery cells 1 arranged side by side, so as to protect the battery cells 1 . The end plate 5 has a certain thickness along the length direction of the battery module 10 , so that the fixing part 3 can be configured as a flat plate, and is bolted to the end plate 5 along the thickness direction of the battery module 10 by bolts. In one embodiment, the end of the side plate 4 and the fixed portion 3 can be connected to the end plate 5 through the same bolt, that is, the screw holes provided on the side plate 4 correspond to the screw holes provided on the fixed portion 3, and the bolts pass through the two holes in turn. The four screw holes are connected to the end plate 5 to improve assembly efficiency.

The fixing part 3 is respectively connected to the two end plates 5 , so that the heating part 2 can be suspended between the two end plates 5 , and the entire heating part 2 can be deformed with the expansion of the battery cell 1 . The fixing part 3 is fixedly connected with the two end plates 5, realizing the connection between the heating element 20 and the battery module 10, and at the same time, other installation structures for the connection of the fixing part 3 in the battery module 10 are omitted, thereby reducing the production cost.

In some embodiments, please refer to FIG. 9 and FIG. 10 , the battery module 10 further includes a first strap 6 and a second strap 7 surrounding the plurality of battery cells 1 and the end plate 5, the first strap 6 and the second strap The two straps 7 are arranged opposite to each other and clamp a plurality of battery cells 1 , and the heating element 20 is arranged between the first strap 6 and the second strap 7 .

The first cable tie 6 and the second cable tie 7 are annular structures capable of surrounding a plurality of battery cells 1 , and they are formed into an annular structure through a belt-shaped structure. The first strap 6 and the second strap 7 are arranged opposite to each other along the height direction Z of the battery cell 1, so as to secure multiple battery cells 1 from opposite ends of the battery module 10 along the height direction Z of the battery cell 1. Preload. Specifically, the first strap 6 and the second strap 7 can be made of metal or plastic. 6 and the rebound force of the second cable tie 7, the plurality of battery cells 1 can be tightened to ensure that the plurality of battery cells 1 in the battery module 10 do not shake.

Along the height direction Z of the battery cell 1 , the heating element 20 is arranged between the first strap 6 and the second strap 7 . Avoid the first strap 6 and the second strap 7 being spaced between the battery cell 1 and the heating element 20 , affecting the heating of the battery cell 1 by the heating element 20 .

The part of the end plate 5 between the first strap 6 and the second strap 7 is connected to the fixing part 3. In order to ensure that two adjacent battery modules 10 can maintain a good contact relationship with the heating element 20, it can be A fixing part 3 is respectively bolted to the end plates 5 of the two battery modules 10 . In the embodiment shown in FIG. 10 , the fixing part 3 includes a mounting shell 82 disposed on the edge of the heating pad 21 , and a wire 83 at least partially accommodated in the mounting shell 82 , and the fixing part 3 and the heating pad 21 are set independently. The wire 83 is electrically connected to the circuit of the heating part 2 , and the installation shell 82 is provided with a mounting hole 84 through which a bolt passes, so as to connect the installation shell 82 and the battery module 10 . The fixing part 3 also includes an electrical connector 85 , the wire 32 passes through the installation shell 31 to connect the heating part 2 and the electrical connector 85 , and the electrical connector 85 is then electrically connected to an external circuit. Specifically, the external circuit may be a control circuit of an electrical device. For example, when the electrical device is a vehicle, the electrical connector 85 may be connected to the entire vehicle circuit of the vehicle. The electrical connector 85 and the external circuit can be electrically connected or disconnected directly by plugging and unplugging, so as to facilitate the installation of the battery 100 on the electrical device.

Referring to FIG. 11 , the heating pad 21 includes a heating circuit layer 211 and an insulating and heat-conducting layer 212 covering the heating circuit layer 211 , and the heating circuit layer 211 includes a heating circuit 211 a bent back and forth.

The heating circuit layer 211 may only include one heating circuit 211a that is bent back and forth, or may include multiple heating circuits 211a that are bent back and forth. The connections form a loop. The heating circuit 211a can convert electrical energy into thermal energy to dissipate heat to the outside. The insulating and heat-conducting layer 212 and/or the heat-conducting sheet 22 can be made of silica gel, so that the insulating and heat-conducting layer 212 or the heat-conducting sheet 22 has insulation, heat conductivity and flexibility at the same time. The insulating and heat-conducting layer 212 covers the outside of the heating circuit 211 a to ensure the insulation between the heating circuit layer 211 and the battery cell 1 , which is beneficial to the operation of the battery cell 1 .

The heating circuit 211a can extend in a spiral shape in the insulating and heat-conducting layer 211. By adjusting the distance between adjacent heating circuits 211a, the heat emitted by the heating pad 21 can be different from the center to the edge of the heating pad 21. The heating circuit 211a can also extend in a serpentine shape in the insulating and heat-conducting layer 211. When the extending direction is the height direction Z of the heating module, by adjusting the distance between adjacent heating circuits 211a, the heating pad 21 can be realized to emit heat along the height direction Z. There is a difference in heat; when the extension direction is the length direction of the heating module, by adjusting the distance between adjacent heating circuits 211a, the heat emitted by the heating pad 21 along the length direction can be realized to have a difference. The heating circuit 211a can be bent and distributed in a variety of ways, and will not be repeated here. Those skilled in the art can understand that adjusting the power of the heating circuit 211a, the distribution position of the heating circuit 211a in the insulating and heat-conducting layer 212, and the heating The series-parallel connection of the circuit 211a can make the heating element 20 exhibit different heating effects, so as to adapt to different working scenarios.

In some embodiments, a connection portion is formed between adjacent battery cells 1 of the battery module 10. Along the first direction X, the heating pad 21 includes a plurality of main heating areas 21a arranged at intervals and connects two adjacent main heating areas 21a. The secondary heating zone 21b is arranged facing the connecting portion, and the distribution density of the heating circuits 211a in the main heating zone 21a is higher than that in the secondary heating zone 21b.

The heat conduction sheet 22 connected to the main heating area 21a is in contact with the second side wall 102b of the battery cell 1, and the heat conduction sheet 22 connected to the secondary heating area 21b may be in contact with the corner connecting the first side wall 102a and the second side wall 102b. surface contact, and may also be in contact with structures such as heat insulation pads and spacers accommodated between adjacent battery cells 1, that is to say, the heat dissipated by the heat conduction sheet 22 connected to the secondary heating area 21b may not be directly conducted to the In the battery cell 1, therefore, a lower density of the power generation circuit 211a is provided in the sub heating area 21b. By setting the main heating area 21a and the auxiliary heating area 21b, the heating capabilities of the heating element 20 to the battery module 10 are different at different places, and the heat energy emitted by the heating element 20 is directly conducted to the battery cell 1 as much as possible, thereby improving the heating capacity of the heating element 20. Effective utilization of heat energy.

In some embodiments, please refer to FIG. 12 , the heating pad 21 includes a middle heating zone 21c and an end heating zone 21d, the end heating zone 21d is located at both ends of the middle heating zone 21c along the first direction X, and the heating circuit 211a is in the middle The distribution density in the heating zone 21c is lower than that in the end heating zone 21d.

The heat energy at both ends of the battery module 10 is easier to diffuse to the external environment than the heat energy in the middle area of the battery module 10 . Therefore, in the same battery 100 , the temperature of the battery cells 1 near the edge of the environment will be lower. By setting the distribution density of the end heating zone 21d higher than the distribution density of the middle heating zone 21c, for example, as shown in FIG. The heating circuit 211a is arranged in the secondary heating zone 21b between the main heating zones 21a without reciprocating and coiling distribution, and the heating circuits 211a in the multiple main heating zones 21a are connected in series to form a loop, and the heating circuit 211a in each main heating zone 21a is coiled. Similarly, they all extend in a serpentine shape along the height direction Z of the heating module 10 . The spacing between adjacent main heating zones 21a in the end heating zone 21d is smaller than the spacing between adjacent main heating zones 21a in the middle heating zone 21c, so that the heat energy produced by the end heating zone 21d is greater than that of the middle heating zone in a unit time. The thermal energy generated by the zone 21c balances the temperature rise rate of the battery module 10 everywhere.

In some embodiments, there are multiple heating circuits 211a, the multiple heating circuits 211a are connected in parallel, and the multiple heating circuits 211a are coiled in parallel in sequence in the same plane.

Multiple heating circuits 211a are connected in parallel, which can reduce the total resistance and improve the heating efficiency. Multiple heating circuits 211a are coiled in parallel in the same plane, that is, multiple heating circuits 211a are arranged alternately along a certain direction, for example: when the heating circuit 211a extends along the height direction Z of the battery module 211 a are alternately arranged in turn along the height direction Z of the battery module 10 .

Multiple heating circuits 211a can be connected to different control switches, so that each heating circuit 211a can be controlled separately through control switches, so that the heating element 20 can be controlled to use different powers to heat the battery cells 1 according to different scenarios. For example, in the driving state of the vehicle, when the temperature of the battery cell 1 is detected to be 0°C, control multiple heating circuits 211a to be energized to heat the battery cell 1 with the maximum heating power, so that the temperature of the battery cell 1 rises rapidly; When the temperature of the battery cell 1 is detected to be 15° C., some of the heating circuits 211 a are controlled to be energized to heat the battery cell 1 with a small heating power, so that the temperature of the battery cell 1 rises steadily.

Please refer to FIG. 13, the manufacturing method of the battery of the embodiment of the present application includes:

S100, providing at least one battery module, the battery module includes a plurality of battery cells arranged side by side along a first direction, and the battery cells are stacked on each other through the first side wall;

S200, providing a heating element, the heating element includes a heating part and a fixing part, and the fixing part is located at at least one end of the heating part along the first direction;

S300. Install the fixing part to fix the heating part on the second side wall of the battery cell, so that the heating part presses against the second side wall; wherein the heating element is used to heat the battery module.

The fixing part can be fixed with the battery module, and can also be fixed with other components in the battery, so that the heating part can be fixed and pressed against the second side wall of the battery cell. It should be noted that, for the relevant structure of the battery manufactured by the above battery manufacturing method, reference may be made to the batteries provided in the above embodiments.

When assembling a battery based on the above battery manufacturing method, it is not necessary to follow the above steps in order, that is to say, the steps can be performed in the order mentioned in the embodiments, or the steps can be performed in a different order than the order mentioned in the embodiments, or Several steps are performed simultaneously. For example, the steps S100 and S200 are not executed sequentially, and may also be executed simultaneously.

Please refer to FIG. 14 , the embodiment of the present application also provides a battery manufacturing system 30 including:

The first providing device 31 is configured to provide at least one battery module, the battery module includes a plurality of battery cells arranged side by side along the first direction, and the battery cells are stacked on each other through the first side wall;

The second providing device 32 is configured to provide a heating element, the heating element includes a heating part and a fixing part, and the fixing part is located at at least one end of the heating part along the first direction;

The assembly device 33 is used to install the fixing part, so as to fix the heating part on the second side wall of the battery cell, so that the heating part presses against the second side wall;

Wherein, the heating element is used to heat the battery module. For the relevant structure of the battery manufactured by the above-mentioned manufacturing system 30 , reference may be made to the batteries provided in the above-mentioned embodiments.

While the application has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for parts thereof without departing from the scope of the application. In particular, as long as there is no structural conflict, the technical features mentioned in the various embodiments can be combined in any manner. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

A battery comprising:

at least one battery module, including a plurality of battery cells arranged side by side along a first direction, and the battery cells are stacked on each other through the first side wall; and

a heating element, used to heat the battery module;

Wherein, the heating element includes a heating part and a fixing part, the fixing part is located at at least one end of the heating part along the first direction, and the fixing part is used to fix the heating part to the battery cell the second side wall, so that the heating part presses against the second side wall.
The battery according to claim 1, wherein the heating part comprises a heating pad and a plurality of heat conducting sheets protruding from at least one side of the heating pad, and the plurality of heat conducting sheets are arranged on the battery cell and the Between the heating pads, the heat conducting sheet is configured to be elastically deformable and press against the battery cells, so as to conduct heat between the heating pads and the battery cells.
The battery according to claim 2, wherein there are at least two battery modules, and the heating element is disposed between adjacent battery modules.
The battery according to claim 3, wherein a plurality of the heat conducting sheets are arranged on opposite sides of the heating pad, and the heat conducting sheets arranged on both sides of the heating pad are separated from two adjacent battery modules. contacts separately.
The battery according to claim 3, wherein the battery module further comprises a side plate, the side plate is disposed opposite to a plurality of the battery cells, and the heating element is pressed against the side plate and the battery between modules.
The battery according to any one of claims 1 to 5, wherein the fixing part is located on both sides of the heating part along the first direction, and is fixed to the battery module by bolts.
The battery according to claim 6, wherein the battery module further comprises two end plates, the two end plates are respectively located on both sides of the plurality of battery cells along the first direction, and the fixing The parts are respectively connected with the two end plates.
The battery according to claim 7, wherein the battery module further comprises a first strap and a second strap surrounding the plurality of battery cells and the end plate, the first strap and the The second strap is arranged oppositely and clamps the plurality of battery cells, and the heating element is arranged between the first strap and the second strap.
The battery according to any one of claims 2 to 8, wherein the heating pad includes a heating circuit layer and an insulating and heat-conducting layer covering the heating circuit layer, and the heating circuit layer includes a heat generating circuit layer arranged by reciprocating bending. circuit.
The battery according to claim 9, wherein a connecting portion is formed between adjacent battery cells of the battery module, and along the first direction, the heating pad includes a plurality of main heating areas arranged at intervals, and an auxiliary heating area connecting two adjacent main heating areas, the auxiliary heating area is arranged facing the connection part, and the distribution density of the heating circuits in the main heating area is higher than that in the auxiliary heating area distribution density.
The battery according to claim 9, wherein the heating pad includes a middle heating area and an end heating area, the end heating areas are located at both ends of the middle heating area along the first direction, and the heating The distribution density of circuits in the middle heating zone is lower than that in the end heating zone.
The battery according to claim 9, wherein the number of the heating circuits is multiple, the multiple heating circuits are connected in parallel, and the multiple heating circuits are coiled in parallel in sequence in the same plane.
The battery according to claim 9, wherein the material of the insulating and heat-conducting layer and/or the heat-conducting sheet is silica gel.
An electrical device, comprising the battery according to any one of claims 1 to 13, the battery is used to provide electrical energy.
A method of manufacturing a battery, comprising:

providing at least one battery module, the battery module includes a plurality of battery cells arranged side by side along a first direction, and the battery cells are stacked on each other through the first side wall;

providing a heating element, the heating element including a heating part and a fixing part, the fixing part is located at at least one end of the heating part along the first direction;

installing the fixing part to fix the heating part to the second side wall of the battery cell, so that the heating part presses against the second side wall;

Wherein, the heating element is used to heat the battery module.
A battery manufacturing system, comprising:

The first providing device is used to provide at least one battery module, the battery module includes a plurality of battery cells arranged side by side along the first direction, and the battery cells are stacked on each other through the first side wall;

The second providing device is used to provide a heating element, the heating element includes a heating part and a fixing part, and the fixing part is located at at least one end of the heating part along the first direction;

an assembly device for installing the fixing part to fix the heating part to the second side wall of the battery cell, so that the heating part presses against the second side wall;

Wherein, the heating element is used to heat the battery module.