CN218215429U - Battery, battery management system and device using the battery as power supply - Google Patents

Abstract

The application relates to a battery, a battery management system and a device using the battery as a power supply, comprising a shell component with a containing cavity; at least one electrode assembly, which is arranged in the accommodating cavity and comprises a tab and an electrode main body, wherein the tab is arranged on the top end surface of the electrode main body; a thermoelectric module provided on an outer surface of the electrode body and configured to generate a voltage according to a temperature difference of the surface of the electrode body; the resistance sheet is arranged on the bottom end face of the electrode main body, which is deviated from the lug; the resistance sheet and the thermoelectric component are electrically connected to form a loop so as to increase the temperature of the bottom end of the electrode main body. The battery, the battery management system and the device using the battery as the power supply have the advantage of low temperature difference in the working process.

Description

Battery, battery management system and device using the battery as power supply

Technical Field

The present disclosure relates to a battery, and more particularly, to a battery, a battery management system and a device using the battery as a power source.

Background

The battery converts the chemical energy of the battery into electric energy to drive other parts to complete corresponding functions; in this process, due to the battery characteristics, a portion of the capacity tends to be lost in the form of self-heating.

In research, it is found that during operation of an electrode assembly inside a battery, since tabs are externally energized ports, current flows intensively, a large amount of joule heat is generated, and thus the temperature of the top and adjacent side portions of the electrode assembly where the tabs are located is higher than that of the bottom. Such a temperature difference causes a great change in the concentration of the electrolyte inside the electrode assembly, thereby deteriorating the performance of the battery.

SUMMERY OF THE UTILITY MODEL

In view of the above, it is necessary to provide a battery, a battery management system, and a device using the battery as a power source, in order to solve the problem of large temperature difference during the operation of the battery.

A battery, comprising: a housing assembly having a receiving cavity; at least one electrode assembly, which is arranged in the accommodating cavity and comprises a tab and an electrode main body, wherein the tab is arranged on the top end surface of the electrode main body; a thermoelectric module provided on an outer surface of the electrode body and configured to generate a voltage according to a temperature difference of the surface of the electrode body; the resistance sheet is arranged on the bottom end face, deviating from the lug, of the electrode main body; the resistance sheet and the thermoelectric component are electrically connected to form a loop so as to increase the temperature of the bottom end of the electrode main body.

In one embodiment, the thermoelectric module comprises a first film member made of a P-type semiconductor material and a second film member made of an N-type semiconductor material;

the top end surface of the electrode main body and the large side surface adjacent to the top end surface are high-temperature areas;

the first end of the first thin film piece is attached to the high-temperature area, and the second end of the first thin film piece extends downwards until the second end of the first thin film piece reaches the bottom end face of the electrode main body;

the first end of the second thin film piece is attached to the high-temperature area, and the second end of the second thin film piece extends downwards until the second end of the second thin film piece reaches the bottom end face of the electrode main body;

the resistor sheet is electrically connected with the second end of the first thin film piece and the second end of the second thin film piece respectively to form a current loop.

In one embodiment, the case assembly includes a case having one open end, an electrode terminal, and a cap plate;

the electrode terminal is arranged on the cover plate and is electrically connected with the lug;

the cover plate is covered on the opening of the shell to form the accommodating cavity;

a plastic insulating layer is arranged on the bottom surface of the shell opposite to the bottom end surface;

the end part of the second end of the first film piece is bent to form a first low-temperature surface parallel to the bottom end surface;

the end part of the second end of the second film piece is bent to form a second low-temperature surface parallel to the bottom end surface;

the first low-temperature surface, the second low-temperature surface and the resistor sheet are stacked between the plastic insulating layer and the bottom end surface;

the first low-temperature surface and the second low-temperature surface are connected with the resistor sheet to form a loop.

In one embodiment, the battery includes one of the electrode assemblies;

the end part of the first end of the first thin film piece is bent to form a first high-temperature surface parallel to the top end surface;

the end part of the first end of the second thin film piece is bent to form a second high-temperature surface parallel to the top end surface;

the first high-temperature surface and the second high-temperature surface are stacked between the cover plate and the top end surface.

In one embodiment, the case assembly includes two of the electrode terminals;

the cover plate comprises a plastic layer and a metal layer; the plastic layer is arranged opposite to the top end face, and the two electrode terminals sequentially penetrate through the plastic layer and the metal layer;

the area of the plastic layer between the two electrode terminals is a specific area; the first high-temperature surface and the second high-temperature surface are stacked between the specific area and the top end surface.

In one embodiment, the first film member includes a first connecting section connecting the first low temperature face and the first high temperature face;

the second thin film piece comprises a second connecting section for connecting the second low-temperature surface and the second high-temperature surface;

the electrode main body comprises two large side surfaces which are oppositely arranged;

the first connecting section and the second connecting section are respectively attached to the two large side faces.

In one embodiment, the first connecting section is in the shape of an elongated strip;

and/or the second connecting section is in a shape of a slender strip.

In one embodiment, the battery includes at least two of the electrode assemblies;

the first end of the first film member is disposed between the large sides of the two electrode assemblies;

the first end of the second film member is disposed between the large sides of the two electrode assemblies.

In one embodiment, the first film member is L-shaped in cross section, and a first end of the first film member is formed as a thin surface parallel to the large side surface;

and/or the cross section of the second film piece is L-shaped, and the first end of the second film piece is formed into a thin surface parallel to the large side surface.

In one embodiment, the housing assembly includes a first inductive terminal and a second inductive terminal;

the first induction terminal is electrically connected with the first low-temperature surface;

the second induction terminal is electrically connected with the second low-temperature surface;

the first sensing terminal and the second sensing terminal are used for being connected with the outside to sense the voltage generated by the thermoelectric component.

A battery management system comprises the battery.

A device using the battery as a power supply comprises the battery.

The beneficial effects are that: the battery comprises a shell assembly, an electrode assembly, a thermoelectric assembly and a resistance sheet; the shell component is provided with a containing cavity; an electrode assembly is disposed within the receiving cavity. The electrode assembly comprises a lug and an electrode main body, wherein the lug is electrically connected with the electrode main body and is arranged on the top end surface of the electrode main body; the thermoelectric component is arranged on the outer surface of the electrode main body; the resistance sheet is arranged on the bottom end face of the electrode main body, which is far away from the lug; the thermoelectric component and the resistance sheet are arranged in the accommodating cavity; the resistance sheet is electrically connected with the thermoelectric component to form a loop;

therefore, the thermoelectric assembly converts the voltage generated by the temperature difference into heat to be released from the resistor sheet, and on one hand, the temperature of the bottom end face of the electrode main body is improved; on the other hand, the thermoelectric module converts heat of the outer surface of the electrode body into electric energy, thereby reducing the temperature at the tip end face and the large side face; finally, the temperature difference between the bottom end face with lower temperature and the top end face with higher temperature and the large side face is effectively reduced, so that the whole battery is kept in a proper temperature difference range, the deterioration speed of the performance of the battery is effectively delayed, and the use experience of a user is improved.

Drawings

Fig. 1 is an exploded view of a battery according to an embodiment of the present application;

FIG. 2 is an assembled schematic view of the battery shown in FIG. 1;

FIG. 3 isbase:Sub>A sectional view A-A of FIG. 2;

fig. 4 is an exploded view of a battery according to another embodiment of the present application;

FIG. 5 is an assembled schematic view of the battery shown in FIG. 4;

FIG. 6 is a sectional view taken along line B-B of FIG. 5;

fig. 7 is a schematic diagram of a battery management system according to an embodiment of the present application.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is capable of embodiments in many different forms than those described herein and that modifications may be made by one skilled in the art without departing from the spirit and scope of the application and it is therefore not intended to be limited to the specific embodiments disclosed below.

In the description of the present application, it is to be understood that the terms "central," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and to simplify the description, but are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the present application.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless explicitly specified otherwise.

In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be interconnected within two elements or in a relationship where two elements interact with each other unless otherwise specifically limited. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature "under," "beneath," and "under" a second feature may be directly under or obliquely under the second feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

Referring to fig. 1 to 6, a first aspect of the present application provides a battery 100.

The battery 100 includes a can assembly 10, at least one electrode assembly 20, a thermoelectric assembly 30, and a resistive sheet 40.

Wherein the housing assembly 10 has a receiving cavity 11; at least one electrode assembly 20 is disposed in the receiving cavity 11.

Specifically, the case assembly 10 includes a case 12, an electrode terminal 13, and a cap plate 14. The case 12 has a thin-walled hollow structure with one end open, and the electrode assembly 20 can be inserted into the case 12 through the opening.

The electrode assembly 20 includes a tab 21 and an electrode main body 22, the tab 21 is electrically connected to the electrode main body 22, and the tab 21 is disposed on a tip end surface 221 of the electrode main body 22.

The electrode assembly 20 is configured to convert chemical energy into electrical energy and thermal energy. The electrode main body 22 includes a positive electrode tab, a negative electrode tab, and a separator. The positive plate and the negative plate each include a coating region. The positive plate active material is coated on the coating region of the positive plate, and the negative plate active material is coated on the coating region of the negative plate. The diaphragm is an insulator and is arranged between the positive plate and the negative plate, and the diaphragm is used for separating a coating area of the positive plate from a coating area of the negative plate. The positive electrode sheet, separator, and negative electrode sheet are stacked in this order and wound to form the electrode main body 22.

The tabs 21 of each electrode assembly 20 are generally provided in two, one for a positive electrode tab and the other for a negative electrode tab. The end of the positive electrode sheet has a blank area not coated with the positive electrode active material, and a plurality of blank areas of the positive electrode sheet are connected together to form a positive electrode tab of the electrode assembly 20. The end of the negative electrode sheet has a blank region not coated with the negative active material, and the blank regions of the negative electrode sheet are connected together to form a negative electrode tab of the electrode assembly 20.

Alternatively, the material of the positive electrode sheet constituting the positive electrode tab may include aluminum foil. The material of the negative plate constituting the negative electrode tab may include copper foil.

Optionally, the positive electrode sheet active material comprises lithium cobaltate. The negative electrode tab active material includes silicon.

The cover plate 14 covers the opening of the case 12 to form the closed receiving chamber 11, thereby enclosing the electrode assembly 20 within the case 12. The electrode terminal 13 is provided on the lid plate 14, and the electrode terminal 13 is electrically connected to the tab 21.

With the structure shown in fig. 1 and 4, two first holes 143 are spaced apart from each other in the cover plate 14. Two electrode terminals 13 are generally disposed on the case assembly 10 of each battery 100, one being a positive electrode terminal and the other being a negative electrode terminal, the positive electrode terminal being inserted into one of the two first holes 143, and the negative electrode terminal being inserted into the other of the two first holes 143. The positive electrode terminal is correspondingly conducted with the positive electrode tab, and the negative electrode terminal is correspondingly conducted with the negative electrode tab.

Thus, in the operation of the electrode assembly 20, the tabs 21 are energized to the outside through the corresponding electrode terminals 13, and the current flows intensively, generating a large amount of joule heat, which in turn causes rapid temperature increase of the top end surface 221 of the electrode main body 22 where the tabs 21 are located and the large side surface 223 adjacent to the top end surface 221; while the temperature away from the base end surface 222 of the tab 21 is lower relative to the top end surface 221 and the large side surface 223.

It is to be understood that in some related designs, the thermal energy is converted to electrical energy by the thermoelectric material using the seebeck effect for recovery; however, the inconsistency of the temperature difference among places during the operation of the electrode assembly is not solved or improved, and thus only the amount of electricity can be improved without leaving room for improvement in the deterioration of the battery performance.

In the present embodiment, the thermoelectric module 30 is disposed on an outer surface of the electrode body 22. The thermoelectric assembly 30 is configured to generate a voltage according to a temperature difference of the surface of the electrode body 22. The resistance sheet 40 is arranged on the bottom end surface 222 of the electrode main body 22, which is far away from the lug 21; the thermoelectric component 30 and the resistive sheet 40 are both arranged in the accommodating cavity 11; the resistive sheet 40 is electrically connected to the thermoelectric module 30 to form a circuit.

Thus, the thermoelectric module 30 converts the voltage generated by the temperature difference into heat to be released from the resistive sheet 40, on one hand, the temperature of the bottom end surface 222 of the electrode main body 22 is increased; on the other hand, the thermoelectric module 30 converts heat of the outer surface of the electrode main body 22 into electric energy, thereby reducing the temperature at the tip end surface 221 and the large side surface 223; finally, the temperature difference between the bottom end surface 222 at the lower temperature and the top end surface 221 and the large side surface 223 at the higher temperature is effectively reduced, so that the whole battery 100 is kept in a proper temperature difference range, the deterioration speed of the performance of the battery 100 is effectively delayed, and the use experience of a user is improved.

Alternatively, the cover plate 14 may have a flat plate shape.

In some embodiments, referring to fig. 1-6, thermoelectric element 30 includes a first thin-film element 31 made of a P-type semiconductor material and a second thin-film element 32 made of an N-type semiconductor material.

The P-type semiconductor may be Bi2Te 3-Sb 2Te3, and the N-type semiconductor material may be Bi2Te 3-Bi 2Se3.

The first thin-film member 31 and the second thin-film member 32 are integrally strip-shaped, and have a first end near the top end surface 221 of the electrode main body 22 and a second end near the bottom end surface 222.

The first film member 31, the second film member 32, and the tab 21 are insulated from each other. Wherein, an insulating paint layer can be wrapped on the semiconductor materials of the first film piece 31 and the second film piece 32; or insulating is realized by pouring insulating glue.

The distal end surface 221 of the electrode main body 22 and the large side surface 223 adjacent to the distal end surface 221 are high temperature regions. The first end of the first thin film member 31 is attached to the high temperature region, and the second end of the first thin film member 31 extends downward until reaching the bottom end surface 222 of the electrode main body 22. The first end of the second thin film member 32 is attached to the high temperature region, and the second end of the second thin film member 32 extends downward until reaching the bottom end surface 222 of the electrode main body 22.

The first thin-film member 31 is configured to generate a corresponding positive voltage according to a temperature difference between a high-temperature region of the surface of the electrode main body 22 and the bottom end face 222; the second thin-film piece 32 is configured to generate a negative voltage according to a temperature difference between the high-temperature region of the surface of the electrode body 22 and the bottom end face 222.

The resistive sheet 40 is electrically connected to the second end of the first thin film member 31 and the second end of the second thin film member 32, respectively, to form a current loop.

Specifically, the resistive sheet 40 is electrically connected to the second end of the first thin film member 31, and the resistive sheet 40 is electrically connected to the second end of the second thin film member 32, so that the first thin film member 31, the resistive sheet 40 and the second thin film member 32 form a current loop; the thermoelectric module 30 flows on the resistive sheet 40 by the electric energy generated by the temperature difference, and converts the electric energy into heat again to release the heat; thereby increasing the temperature of the bottom end surface 222 of the electrode main body 22, reducing the temperature at the top end surface 221 or the large side surface 223, and effectively reducing the temperature difference on the surface of the electrode main body 22, so that the battery 100 is kept in a proper temperature difference range, the deterioration speed of the performance of the battery 100 is effectively delayed, and the use experience of a user is improved.

The resistance sheet 40 may be made of copper alloy or the like as a resistance wire, and may be covered with a corresponding insulating material. When the first thin film 31 and the second thin film 32 are required to be electrically connected, the insulating material can be scraped off in corresponding areas to expose the internal conductive structure, and the resistive sheet 40 is electrically connected with the first thin film 31 and the second thin film 32 by ultrasonic welding, laser welding, and the like.

In some embodiments, as shown in fig. 1 to 6, a plastic insulating layer 121 is disposed on a bottom surface of the housing 12 opposite to the bottom end surface 222; the metal shell is arranged on the outer side of the shell 12, so that heat conduction is facilitated.

The end of the second end of the first film member 31 is bent to form a first low temperature surface 311 parallel to the bottom end surface 222; the end of the second film member 32 is bent to form a second low temperature surface 321 parallel to the bottom end surface 222.

It is to be understood that, in the seebeck effect, the larger the temperature difference between the first end and the second end of the first thin-film member 31, the higher the generated voltage; therefore, the first low temperature surface 311 and the resistive sheet 40 can be stacked between the plastic insulating layer 121 and the bottom surface 222, so that the first film member 31 obtains the maximum temperature difference, and the second film member 32 can obtain the same effect.

Therefore, in the structural design, the first low temperature surface 311, the second low temperature surface 321 and the resistive sheet 40 can be stacked between the plastic insulating layer 121 and the bottom surface 222. The resistive sheet 40 may be disposed generally at the lowermost layer; i.e., adjacent to the housing 12; the first low temperature surface 311 and the second low temperature surface 321 only obtain temperature and do not need to be electrically connected with the electrode main body 22, so the stacking sequence can be designed specifically as required. The shape area of the first low-temperature surface 311 and the shape area of the second low-temperature surface 321 can be close to or equal to the bottom end surface 222, so as to better obtain the lowest temperature and generate the corresponding voltage. The shape and area of the resistive sheet 40 can be close to or equal to the bottom end surface 222, so as to better and uniformly heat the bottom end surface 222.

The first low-temperature surface 311 and the second low-temperature surface 321 are connected with the resistive sheet 40 to form a loop, and the electric energy obtained by the seebeck effect is converted into heat energy again, so that the temperature of the bottom end surface 222 of the electrode main body 22 is increased, and the temperature difference on the surface of the electrode main body 22 is effectively reduced.

In some embodiments, as shown in fig. 1-3, battery 100 includes an electrode assembly 20. Wherein the end of the first thin film member 31 is bent to form a first high temperature surface 312 parallel to the top end surface 221. The end of the first end of the second film member 32 is bent to form a second high temperature surface 322 parallel to the top end surface 221.

Only one electrode assembly 20 is accommodated in the accommodating chamber 11, so that the large side 223 and the small side 224 (mentioned below) of the circumference of the electrode assembly 20 can be heat-dissipated through the case 12 with good heat dissipation, and the tab 21 is disposed on the top end surface 221 of the electrode main body 22, and current is concentrated to flow, thereby generating a large amount of joule heat, which in turn causes the top end surface 221 to easily have a high temperature.

The first high temperature surface 312 and the second high temperature surface 322 are stacked between the cover plate 14 and the top surface 221.

Specifically, with the first thin-film member 31, the first high-temperature surface 312 absorbs heat from the tip end surface 221, and the temperature rises; the first low-temperature surface 311 is positioned at the bottom end surface 222 far away from the tab 21, the temperature difference is maximum, and the value of the generated positive voltage is correspondingly maximum; similarly, the negative voltage generated by the second thin film member 32 is also maximized.

Therefore, by using the joule heating principle, the resistive sheet 40 obtains enough electric energy to generate heat to raise the temperature of the bottom end surface 222 of the electrode main body 22, and the temperature difference on the surface of the electrode main body 22 is effectively reduced.

It should be noted that, in the process of stacking the first high temperature surface 312 and the second high temperature surface 322, insulation is maintained between them; insulation is also maintained between the first high temperature surface 312 and the second high temperature surface 322 and the electrode terminal 13, between the first high temperature surface 312 and the second high temperature surface 322 and between the tab 21, and only heat transfer needs to be ensured.

In some embodiments, as shown in fig. 1 to 3, the case assembly 10 includes two electrode terminals 13; one for the positive electrode terminal and the other for the negative electrode terminal.

The cover plate 14 includes a plastic layer 141 and a metal layer 142; the plastic layer 141 is disposed opposite to the top surface 221, that is, the plastic layer 141 faces the top surface 221.

Two electrode terminals 13 sequentially penetrate through the plastic layer 141 and the metal layer 142; so that the tabs 21 are externally electrified through the corresponding electrode terminals 13. Insulation between the metal layer 142 and the electrode terminal 13 should be maintained by pouring an insulating paste or the like.

The region of the plastic layer 141 between the two electrode terminals 13 is a specific region 144; the first high temperature surface 312 and the second high temperature surface 322 are stacked between the specific region 144 and the top end surface 221, thereby effectively using the space between the two electrode terminals 13, resulting in a more compact structure.

In some embodiments, the electrode assembly 20 is formed in a rectangular parallelepiped structure by winding a positive electrode tab and a negative electrode tab. In conjunction with the orientation shown in fig. 1 and 4, the electrode body 22 includes a top end surface 221, a bottom end surface 222, and side surfaces that are peripherally disposed. According to the difference of the width, the side with the larger width dimension is selected as the large side 223, and the two large sides 223 are arranged oppositely; the side connecting the two large sides 223 is a small side 224, and the two small sides 224 are also oppositely arranged.

The large side surfaces 223 are connected to the top end surface 221 and the bottom end surface 222, respectively, in the vertical direction.

Referring to fig. 1 to 3, the first thin film member 31 includes a first connection section 313 connecting the first low temperature surface 311 and the first high temperature surface 312; the second film member 32 includes a second connection section 323 connecting the second low temperature face 321 and the second high temperature face 322.

The first connecting section 313 and the second connecting section 323 are respectively attached to the two opposite large side surfaces 223, so that the structure is compact, and the large side surface 223 on one side is not too far away from the housing 12, thereby affecting the heat dissipation effect of the housing 12 on the large side surface 223.

In some embodiments, referring to fig. 1 and 2, the first connector segment 313 is in the form of an elongated strip; to minimize the effect of heat dissipation from the housing 12 and the large side 223. Similarly, the second connecting section 323 has an elongated shape.

In some embodiments, referring to fig. 3-6, the battery includes at least two electrode assemblies 20. The two electrode assemblies 20 are attached into a whole and are arranged in the accommodating cavity 11, and the two electrode assemblies 20 are connected in parallel with each other as the tabs 21 of the positive electrode tabs and are electrically connected with the corresponding electrode terminals 13; the tabs 21 of the two electrode assemblies 20, which serve as negative electrode tabs, are connected in parallel with each other and electrically connected to the corresponding electrode terminals 13, thereby achieving the purpose of collectively outputting electric energy.

Since the two electrode assemblies 20 are attached as a whole, the large side 223 of one of the faces, which is originally adjacent to the case 12, needs to be in contact with the large side 223 of the other electrode assembly 20. There is no electrical transmission between the large sides 223 of the two electrode assemblies 20, but there is a heat generation phenomenon between the two large sides 223, and heat cannot be dissipated to the outside through the case 12, so that the temperature rises rapidly.

The first end of the first film member 31 is disposed between the large sides 223 of the two electrode assemblies 20; the heat of the large side 223 is absorbed by the first end of the first film member 31, and the temperature rises; the first low-temperature surface 311 is located at the bottom end surface 222 far away from the tab 21, the temperature difference is the largest, and the generated positive voltage value is correspondingly the largest.

Similarly, the first end of the second film member 32 is disposed between the large sides 223 of the electrode main bodies 22 of the two electrode assemblies 20; the heat of the large side 223 is absorbed by the first end of the second film member 32, and the temperature rises; the first low-temperature surface 311 is located at the bottom end surface 222 far away from the tab 21, the temperature difference is the largest, and the generated negative voltage value is correspondingly the largest.

Thus, by using the joule heating principle, the resistive sheet 40 obtains sufficient electric energy to generate heat to raise the temperature of the bottom end face 222 of the electrode main body 22; and absorbs heat between the large sides 223 of the two electrode assemblies 20 through the first ends of the first and second film members 31 and 32 to lower the temperature; thereby effectively reducing the temperature difference at the surface of the electrode main body 22.

In some embodiments, the first end of the first film member 31 and the first end of the second film member 32 may be stacked between the large sides 223 of the two electrode assemblies 20 while being insulated from each other.

Referring to fig. 6, the first film member 31 has an L-shaped cross section, and a first end of the first film member 31 is formed as a thin surface parallel to the large side 223. The first end of the first film member 31 may be shaped to have an area close to or equal to the large side 223 to better obtain the maximum temperature and generate a corresponding voltage.

The second film member 32 has an L-shaped cross section, and a first end of the second film member 32 is formed as a thin surface parallel to the large side surface 223. Similarly, the first end of the second film member 32 may have a shape area close to or equal to the large side 223 to better obtain the maximum temperature and generate the corresponding voltage.

In some embodiments, as shown in fig. 1-6, housing assembly 10 includes a first inductive terminal 15 and a second inductive terminal 16. The first sensing terminal 15 is electrically connected to the first low-temperature surface 311; the second sensing terminal 16 is electrically connected to the second low-temperature surface 321. The first sensing terminal 15 and the second sensing terminal 16 are used for connecting to the outside to sense the voltage generated by the thermoelectric module 30.

Specifically, the health of the electrode assembly 20 in the battery 100 is evaluated by connecting the first and second sensing terminals 15 and 16 to an external control center 300 (mentioned below) to monitor the voltage generated from the thermoelectric assembly 30 and thus the effect of the surface temperature difference of the electrode main body 22 in real time. When decomposition of a solid electrolyte interface film (abbreviated as an SEI film), micro-short circuit, or the like occurs inside the electrode assembly 20, the electrode assembly 20 emits a large amount of heat, and the temperature difference at the surface of the electrode assembly 20 is further increased, at which time the voltage difference between the first film member 31 and the second film member 32 is greater. By monitoring the change curvature of the voltage difference, the abnormality inside the battery 100 can be fed back in time, and early safety warning can be achieved, for example, the electric connection of the battery 100 is disconnected in advance, and the battery 100 is reminded to be replaced in time.

In some embodiments, the first sensing terminal 15 and the second sensing terminal 16 may be disposed on the cover plate 14; in other embodiments, the first inductive terminal 15 and the second inductive terminal 16 may be disposed on the housing 12.

Referring to fig. 1 and 4, the cover plate 14 is further provided with an explosion-proof valve 17, and optionally, the explosion-proof valve 17 is arranged between the positive electrode terminal and the negative electrode terminal.

Since a large amount of mixed gas and liquid generated during the charge and discharge of the battery 100 due to the injection of chemicals, such as electrolyte, causes the pressure inside the case 12 to be continuously accumulated, and thus the explosion is easily generated, the present disclosure provides the explosion-proof valve 17 on the cover plate 14, when the internal pressure of the battery 100 is too high, the explosion-proof valve 17 is opened, and the mixed gas and liquid generated during the charge and discharge are rapidly discharged through the explosion-proof valve 17, so as to prevent the explosion of the battery 100 due to the too high internal pressure.

A second aspect of the present application further provides a battery management system. The battery management system includes the battery 100 described above.

Specifically, referring to fig. 7, the battery management system may include an action part 200 and a control center 300. The control center 300 is connected with the battery 100 in a control manner, the first sensing terminal 15 and the second sensing terminal 16 of the battery 100 are in signal connection with the control center 300, and the control center 300 monitors the voltage generated by the thermoelectric assembly 30, so as to monitor the effect of the surface temperature difference of the electrode main body 22 in real time and evaluate the health condition of the electrode assembly 20 in the battery 100.

The battery 100 is electrically connected to the operating member 200, and the battery 100 supplies electric energy to the operating member 200 as power. The motion member 200 may be a motor or the like.

When the control center 300 detects the voltage signal change through the first sensing terminal 15 and the second sensing terminal 16 to determine that the battery 100 is in an abnormal state, the power supply from the battery 100 to the operating member 200 may be stopped.

A third aspect of the present application provides an apparatus using the battery 100 as a power source, which includes the battery 100 described above.

Devices using the battery 100 as a power source include vehicles, ships, and the like.

All possible combinations of the technical features of the above embodiments may not be described for the sake of brevity, but should be considered as within the scope of the present disclosure as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (12)

1. A battery, comprising:

a housing assembly (10) having a receiving cavity (11);

at least one electrode assembly (20) which is arranged in the accommodating cavity (11) and comprises a tab (21) and an electrode main body (22), wherein the tab (21) is arranged on the top end surface (221) of the electrode main body (22);

a thermoelectric module (30) provided on an outer surface of the electrode body (22) and configured to generate a voltage according to a temperature difference of the surface of the electrode body (22);

and the resistance sheet (40) is arranged on the bottom end surface (222) of the electrode main body (22) departing from the lug (21);

the resistance sheet (40) is electrically connected with the thermoelectric component (30) to form a loop so as to increase the temperature of the bottom end of the electrode main body (22).

2. The battery according to claim 1, wherein the thermoelectric module (30) comprises a first thin-film member (31) made of a P-type semiconductor material and a second thin-film member (32) made of an N-type semiconductor material;

the top end surface (221) of the electrode main body (22) and the large side surface (223) adjacent to the top end surface (221) are high-temperature regions;

the first end of the first thin film piece (31) is attached to the high-temperature area, and the second end of the first thin film piece (31) extends downwards until reaching the bottom end face (222) of the electrode main body (22);

the first end of the second thin film piece (32) is attached to the high-temperature area, and the second end of the second thin film piece (32) extends downwards until reaching the bottom end face (222) of the electrode main body (22);

the resistance sheet (40) is electrically connected with the second end of the first film member (31) and the second end of the second film member (32) respectively to form a current loop.

3. The battery according to claim 2, wherein the case assembly (10) comprises a case (12) open at one end, an electrode terminal (13), and a cap plate (14);

the electrode terminal (13) is arranged on the cover plate (14) and is electrically connected with the tab (21);

the cover plate (14) is covered on the opening of the shell (12) to form the accommodating cavity (11);

a plastic insulating layer (121) is arranged on the bottom surface of the shell (12) opposite to the bottom end surface (222);

the end part of the second end of the first film piece (31) is bent to form a first low-temperature surface (311) parallel to the bottom end surface (222);

the end part of the second end of the second film piece (32) is bent to form a second low-temperature surface (321) parallel to the bottom end surface (222);

the first low-temperature surface (311), the second low-temperature surface (321) and the resistor sheet (40) are stacked between the plastic insulating layer (121) and the bottom end surface (222);

the first low-temperature surface (311) and the second low-temperature surface (321) are connected with the resistance sheet (40) to form a loop.

4. The cell of claim 3, wherein said cell includes one of said electrode assemblies (20);

the end part of the first end of the first film piece (31) is bent to form a first high-temperature surface (312) parallel to the top end surface (221);

the end part of the first end of the second film piece (32) is bent to form a second high-temperature surface (322) parallel to the top end surface (221);

the first high temperature surface (312) and the second high temperature surface (322) are stacked between the cover plate (14) and the top end surface (221).

5. The battery according to claim 4, wherein the case assembly (10) includes two of the electrode terminals (13);

the cover plate (14) comprises a plastic layer (141) and a metal layer (142); the plastic layer (141) is arranged opposite to the top end surface (221), and the two electrode terminals (13) sequentially penetrate through the plastic layer (141) and the metal layer (142);

the area of the plastic layer (141) between the two electrode terminals (13) is a specific area (144); the first high temperature surface (312) and the second high temperature surface (322) are stacked between the specific region (144) and the tip end surface (221).

6. The battery according to claim 4, wherein the first film member (31) includes a first connection section (313) connecting the first low temperature face (311) and the first high temperature face (312);

the second film member (32) includes a second connection section (323) connecting the second low temperature surface (321) and the second high temperature surface (322);

the electrode body (22) comprises two oppositely arranged large sides (223);

the first connecting section (313) and the second connecting section (323) are respectively attached to the two large side surfaces (223).

7. The battery according to claim 6, wherein the first connection segment (313) has an elongated strip shape;

and/or the second connecting section (323) is in the shape of an elongated strip.

8. The battery according to claim 3, characterized in that it comprises at least two of said electrode assemblies (20);

the first end of the first film member (31) is disposed between the large sides (223) of the two electrode assemblies (20);

the first end of the second film member (32) is disposed between the large sides (223) of the two electrode assemblies (20).

9. The battery according to claim 8, wherein the first thin-film member (31) has an L-shaped cross section, and a first end of the first thin-film member (31) is formed as a thin surface parallel to the large side surface (223);

and/or the second film member (32) is L-shaped in cross section, and the first end of the second film member (32) is formed into a thin surface parallel to the large side surface (223).

10. The battery according to any one of claims 3 to 9, characterized in that the case assembly (10) comprises a first inductive terminal (15) and a second inductive terminal (16);

the first induction terminal (15) is electrically connected with the first low-temperature surface (311);

the second induction terminal (16) is electrically connected with the second low-temperature surface (321);

the first induction terminal (15) and the second induction terminal (16) are used for being connected with the outside to induce the voltage generated by the thermoelectric component (30).

11. A battery management system, characterized in that it comprises a battery (100) according to any one of claims 1 to 10.

12. A device using the battery as a power source, characterized by comprising the battery (100) according to any one of claims 1 to 10.

Images