CN115986261A - Battery, battery parameter determination method and electronic equipment - Google Patents

Abstract

The application aims at providing a battery, a parameter determination method of the battery and electronic equipment, wherein the battery comprises a naked battery cell and a cladding body, the cladding body is enclosed to form an accommodating cavity for accommodating the naked battery cell, a heat exchange cavity is further arranged in the cladding body, the heat exchange cavity and the accommodating cavity are separated and arranged, a heat exchange fluid is filled in the heat exchange cavity and used for exchanging heat with the naked battery cell, and the heat exchange fluid is a thermal phase change material.

Description

Battery, battery parameter determination method and electronic equipment

technical field

The application belongs to the technical field of electronic technology, and in particular relates to a battery, a method for determining parameters of the battery, and electronic equipment.

Background technique

With the rapid development of electronic technology, more and more people use smart electronic devices.

In order to improve the use experience of smart electronic devices, the quality of batteries has always been a research focus in the field. In related technologies, the charging time of smart electronic devices is longer, which affects the normal use of smart electronic devices.

Contents of the invention

The purpose of the present application is to provide a battery, a method for determining battery parameters and an electronic device, which can improve the problem of a long charging time of an intelligent electronic device.

In the first aspect, the embodiment of the present application proposes a battery, including a bare battery cell and a covering body, the covering body surrounds and forms a storage chamber for accommodating the bare battery cell, and a heat exchange chamber is also provided in the covering body , the heat exchange cavity and the storage cavity are separately arranged, and the heat exchange cavity is filled with a heat exchange fluid for heat exchange with the bare cell, and the heat exchange fluid is a thermal phase change material.

In the second aspect, the embodiment of the present application proposes a battery parameter determination method, which is used for the above-mentioned battery, and the method includes:

According to the charging current and charging impedance, the heat generated when the battery is charged is obtained;

Obtain the quality parameters of the heat exchange fluid in the heat exchange cavity according to the heat, the specific heat capacity of the heat exchange fluid, the preset temperature value, and the latent heat of vaporization value of the heat exchange fluid;

Obtain the vaporization expansion volume of the heat exchange fluid in the heat exchange chamber according to the preset air pressure value, quality parameter and preset temperature value of the battery;

According to the vaporization expansion volume, the gap value of the heat exchange cavity and the thickness of the cladding body are obtained.

In a third aspect, the embodiment of the present application provides an electronic device, including the above-mentioned battery.

In the embodiment of the present application, on the one hand, by setting the covering body, it is possible to provide a covering structure for the bare cell, so that the bare cell has a relatively independent working environment and improve the mechanical strength of the battery. On the other hand, by The heat exchange chamber is directly installed on the covering body of the bare cell, which can effectively cool the bare cell, facilitate the rapid heat dissipation of the battery, and thus greatly increase the charging power that the battery can withstand, and significantly shorten the charging time of the battery.

Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the application.

Description of drawings

The above and/or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, wherein:

Figure 1 is a schematic diagram of the internal structure of a battery in some embodiments of the present application;

Fig. 2 is a schematic diagram of the internal structure of the battery in other embodiments of the present application;

Fig. 3 is a schematic structural view of batteries in some other embodiments of the present application;

Fig. 4 is a schematic diagram of the internal structure of the battery in some other embodiments of the present application;

Fig. 5 is a schematic structural view of batteries in further embodiments of the present application;

Fig. 6 is a schematic diagram of the internal structure of the battery in some other embodiments of the present application;

Fig. 7 is the enlarged schematic diagram of place A in Fig. 6;

Fig. 8 is a schematic diagram of the structure of the temperature control system in some embodiments of the present application;

Fig. 9 is a schematic flowchart of a method for determining battery parameters in some embodiments of the present application;

Fig. 10 is a schematic structural diagram of a battery in an electronic device according to some embodiments of the present application;

Fig. 11 is a schematic structural diagram of a battery in an electronic device according to other embodiments of the present application.

Reference signs:

100, battery; 200, vapor chamber; 300, graphite sheet; 400, main board heating element;

10. Bare cell; 101. Tab;

20. Covering body; 201. Storage chamber; 202. Heat exchange chamber; 203. First part; 204. Second part; 205. Third part; 206. Shell; 207. Cover plate; 208. First shell ; 209, the second shell;

30. Tab lead-out hole; 301. Channel; 302. Hole body;

40. Note hole;

110, control circuit; 120, vacuum gauge; 130, thermometer; 140, vacuum pump.

Detailed ways

Embodiments of the present application will be described in detail below, examples of which are shown in the drawings, in which the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary, are only for explaining the present application, and should not be construed as limiting the present application. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of this application.

The features of the terms "first" and "second" in the description and claims of the present application may explicitly or implicitly include one or more of these features. In the description of the present application, unless otherwise specified, "plurality" means two or more.

In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " Back", "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inner", "Outer", "Clockwise", "Counterclockwise", "Axial", The orientation or positional relationship indicated by "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the application and simplifying the description, rather than indicating or implying the referred device or element Must be in a particular orientation, constructed, and operate in a particular orientation, and thus should not be construed as limiting of the application.

In the description of this application, it should be noted that unless otherwise specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Connected, or integrally connected; it may be mechanically connected or electrically connected; it may be directly connected or indirectly connected through an intermediary, and it may be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in this application in specific situations.

FIG. 1 is a schematic diagram of the internal structure of a battery 100 in some embodiments of the present application.

As shown in FIG. 1 , according to some embodiments of the present application, a battery 100 is provided, including a bare cell 10 and a covering body 20 . The covering body 20 encloses and forms a storage chamber 201 for accommodating the bare electric core 10. A heat exchange chamber 202 is also provided in the covering body 20. The heat exchange chamber 202 is separated from the storage chamber 201. The heat exchange chamber 202 is filled with The heat exchange fluid is used for heat exchange with the bare cell 10, and the heat exchange fluid is a thermal phase change material.

The bare cell 10 refers to components in the battery 100 for electrochemical reactions. Exemplarily, the bare cell 10 can be formed by winding or stacking the positive pole piece and the negative pole piece, and usually a separator is provided between the positive pole piece and the negative pole piece. The part of the positive pole piece and the negative pole piece with the active material constitutes the main body of the electrode body, and the parts of the positive pole piece and the negative pole piece without the active material respectively form tabs. Exemplarily, the accommodating chamber 201 may also be filled with an electrolyte solution (not shown in the figure), which is used for electrochemical reaction between the aforementioned positive pole piece and negative pole piece.

The receiving cavity 201 refers to a cavity inside the covering body 20 for containing the bare cell 10 , for example, the containing cavity 201 may be formed by surrounding the covering body 20 .

The covering body 20 refers to a component that covers and wraps the bare cell 10 , and may be a rigid structure, such as a metal material or an injection molding material. Exemplarily, the covering body 20 may be made of stainless steel or aluminum alloy.

The heat exchange chamber 202 refers to a chamber provided in the enclosure 20 for filling the heat exchange fluid. Exemplarily, the heat exchange chamber 202 may be a sandwich structure, and is disposed in a plate constituting the enclosure 20 . Exemplarily, when the cladding body 20 is formed in a plate-shaped structure, any plate-shaped body on it can be formed by stacking multiple sub-plates, and the gap between the multiple sub-plates is the heat exchange cavity 202 .

The heat exchange fluid refers to the flowable medium disposed in the heat exchange cavity 202 . It can be understood that the specific heat capacity of the heat exchange fluid is greater than the overall specific heat capacity of the storage cavity 201 . In actual use, when there is an obvious heat change (heating or cooling) on the body of the battery 100, the heat exchange fluid can absorb the heat released from the bare cell 10 or supplement heat to the bare cell 10. Taking temperature rise as an example, the bare cell When the core 10 is charging, due to the heat generated by the resistance, it conducts heat to the outside and dissipates heat. After receiving the heat, the heat exchange fluid can store more heat due to its large specific heat capacity, and continuously absorb the heat released by the bare cell 10. The overall temperature of the battery 100 remains stable, but as the charging process progresses, the temperature of the bare cell 10 continues to rise, causing the heat exchange fluid to reach the phase transition temperature and undergo a phase transition, such as evaporating from liquid to gas, accompanied by During the phase change process of the heat exchange fluid, the heat exchange fluid can absorb a large amount of heat, further improving the heat absorption capacity of the heat exchange fluid, and keeping the temperature of the battery 100 stable during the charging process.

On the one hand, by providing the covering body 20, a covering structure can be provided for the bare cell 10, so that the bare cell 10 has a relatively independent working environment, and the mechanical strength of the battery 100 is improved; 10 effectively cools down, which is convenient for the bare cell 10 to dissipate heat quickly, thereby greatly increasing the charging power that the battery 100 can withstand, and shortening the charging time of the battery 100 significantly. The heat exchange medium in the thermal cavity 202 is in a flowing state, which reduces the occurrence of local overheating, and can also significantly enhance the heat absorption of the heat exchange fluid, improve the heat dissipation effect on the bare cell 10, and reduce the charging power of the battery 100. The more obvious the phenomenon of warming is.

Optionally, the specific shape of the covering body 20 can be determined according to the shape of the bare cell 10 , for example, the covering body 20 can be in the form of a cylinder, a flat body, a cuboid or other shapes, which are not limited in this embodiment of the present application. Exemplarily, the covering body 20 cooperates with the bare electric core 10 , and a channel structure for leading out tabs on the bare electric core 10 may be provided thereon.

Optionally, liquid metal can be used as the heat exchange fluid, such as gallium alloy, nano heat dissipation silicon grease or water. Exemplarily, the selection of the heat exchange fluid can refer to the tolerance degree of the cladding body 20, such as the mechanical strength and corrosion resistance of the cladding body 20. For example, when the cladding body 20 adopts a steel shell, the heat exchange fluid adopts water.

FIG. 2 is a schematic diagram of the internal structure of a battery 100 in other embodiments of the present application.

Optionally, the battery 100 may include a plurality of bare cells 10 and a plurality of wrapping bodies 20 , and the plurality of wrapping bodies 20 are arranged opposite to the plurality of bare cells 10 . For example, referring to FIG. 2 , a battery 100 may include two bare cells 10 and two covering bodies 20 , and the two covering bodies 20 are arranged side by side after covering the two bare cells 10 respectively.

FIG. 3 is a schematic structural diagram of a battery 100 in some other embodiments of the present application, and FIG. 4 is a schematic structural diagram of the internal structure of the battery 100 in some other embodiments of the present application.

As shown in FIG. 1 , FIG. 3 and FIG. 4 , according to some embodiments of the present application, the covering body 20 includes a first part 203 and a second part 204 that are oppositely arranged, and a heat exchange cavity 202 is arranged on the first part 203 and the second part 204 . At least one of the two parts 204.

The first part 203 and the second part 204 refer to two parts that are arranged oppositely on the covering body 20, such as two surfaces that are arranged oppositely, or two shells 206 that are set oppositely, one of the shells The body 206 can be a cylindrical structure with an opening at one end, and the other shell 206 can be plate-shaped, and can cover and seal the opening of the aforementioned cylindrical structure.

Taking the square battery 100 as an example, optionally, the battery 100 may include three pairs of surfaces oppositely disposed along the length, width, and height directions of the square, and the first part 203 and the second part 204 may be one pair of oppositely disposed surfaces, such as The first part 203 and the second part 204 can be the pair with the largest area among the three pairs of surfaces, which can make the first part 203 and the second part 204 have a larger area, so that the heat exchange chamber 202 has a larger volume, which is convenient for increasing the heat exchange rate. The filling amount of the thermal fluid also increases the relative area between the heat exchange cavity 202 and the bare cell 10 , improves the heat conduction efficiency, and further improves the heat exchange effect significantly.

Optionally, referring to FIG. 3 and FIG. 4 , according to some embodiments of the present application, the covering body 20 includes a housing 206 and a cover 207, the first part 203 is one of the housing 206 and the cover 207, and the second The part 204 is the other of the housing 206 and the cover plate 207. The housing 206 is provided with a housing cavity 201, the bare cell 10 is disposed in the housing cavity 201, and the cover plate 207 covers the housing 206 and seals the housing cavity. 201 , the heat exchange chamber 202 may be disposed in the casing 206 and/or the cover plate 207 . By setting the casing 206 and the cover plate 207, on the one hand, it can provide a stable accommodation space for the bare cell 10; After 202, it is difficult to produce the covering body 20.

The housing 206 is used to form an accommodation space for accommodating the bare cell 10 , electrolyte (not shown in the figure) and other components. Exemplarily, the housing 206 can be a cylindrical structure with an opening at one end, and the cover plate 207 can cover and seal the opening. It can be understood that the casing 206 can be in various structural forms, such as a cuboid, a cylinder, etc., and the specific shape of the casing 206 can be determined according to the specific shape of the bare cell 10 . It can be understood that the housing 206 can be made of various materials, such as stainless steel, aluminum alloy, and the like.

Optionally, the casing 206 may be a two-layer structure, and the inner and outer layers are connected at the opening of the casing 206 , and the interlayer between the inner and outer layers is the heat exchange chamber 202 .

Optionally, the cover plate 207 can be a double-layer structure connected to each other at the edges, and the interlayer in the middle is the heat exchange chamber 202 .

Exemplarily, in an electronic device, the cover plate 207 may be arranged on one side close to the display screen. In the electronic device, the display screen side has a higher structural strength, and the foregoing arrangement can improve the use safety of the electronic device.

As shown in FIG. 1, according to some embodiments of the present application, the cladding body 20 further includes a third part 205, the third part 205 is at least one side surface connecting the first part 203 and the second part 204, and the heat exchange cavity 202 is set at the first portion 203 and extend into the second portion 204 through the third portion 205 .

The first part 203 and the second part 204 refer to the parts connecting the first part 203 and the second part 204 on the covering body 20 , for example, the side surfaces disposed between the first part 203 and the second part 204 .

Taking the prismatic battery 100 as an example, optionally, the third portion 205 may be any one or more surfaces between the pair of surfaces with the largest area. Exemplarily, the heat exchange cavity 202 of the first part 203 and the second part 204 are connected through the heat exchange cavity 202 in the third part 205,

By extending the heat exchange cavity 202 from the first part 203 to the second part 204, both sides of the bare cell 10 can have a heat exchange cavity 202, which is convenient for maintaining uniform temperature everywhere on the bare cell 10 and reducing local overheating or The risk of overcooling, and because in electronic equipment, the volume of the battery 100 is usually relatively large, the heat exchange chamber 202 is provided on both sides of the battery 100, which is also convenient to form a complete heat conduction path inside the electronic equipment, and the battery The heat dissipation path of 100 is integrated into the heat dissipation path of the electronic equipment, so as to improve the overall heat exchange effect of the electronic equipment.

Fig. 5 is a schematic structural diagram of the battery 100 in some other embodiments of the present application, Fig. 6 is a schematic diagram of the internal structure of the battery 100 in some other embodiments of the present application, and Fig. 7 is an enlarged schematic diagram of point A in Fig. 6 .

As shown in Fig. 1, Fig. 3, Fig. 5 to Fig. 7, according to some embodiments of the present application, the bare cell 10 includes the tab 101, the third part 205 includes the lead-out end surface facing the tab 101, and the heat exchange cavity 202 is set In the lead-out end face, the lead-out end face is provided with a tab lead-out hole 30 that communicates with the housing cavity 201 and the outside of the covering body 20. The tab lead-out hole 30 is separated from the heat exchange chamber 202. The tab 101 passes through the tab lead-out hole 30 from the out of the cladding body 20 .

The tab 101 refers to the area on the pole piece that is not coated with active material, and is used to connect the external circuit and the bare cell 10 to form a complete circuit.

The lead-out end surface refers to the area on the third part 205 corresponding to the tab 101 , which can be used to set up a structure for the tab to lead out of the battery 100 , so as to shorten the path for the tab 101 to lead out from the inside of the battery 100 to the outside of the battery 100 .

The separate setting of the tab outlet hole 30 and the heat exchange chamber 202 means that the tab outlet hole 30 is not in communication with the heat exchange chamber.

On the one hand, by providing the heat exchange cavity 202 on the leading end surface, the heat exchange gap on the side where the tab 101 of the bare cell 10 is drawn out can be filled, and the overall heat exchange effect of the battery 100 can be improved; on the other hand, by providing the tab lead-out hole 30 , it is easy to lead the tab 101 out of the receiving cavity 201 .

Referring to Fig. 7, optionally, the lug outlet hole 30 may include a hole body 302 and a hole channel 301, the hole body 302 is connected to the side wall surrounding the heat exchange cavity 202, the hole channel 301 is set in the hole body 302, and one end is set Outside the covering body 20 , the other end is disposed on a side facing the receiving cavity 201 .

It can be understood that the number of tab lead-out holes 30 matches the number of tabs 101. For example, if there are usually two tabs 101, two tab lead-out holes 30 can also be provided. Two tab lead-out holes 30 corresponds to two tabs 101 .

As shown in FIGS. 5 to 7 , according to some embodiments of the present application, the covering body 20 includes a first shell 208 and a second shell 209 that are stacked, and the first shell 208 and the second shell 209 are enclosed. A heat exchange cavity 202 is formed, and an injection hole 40 is provided on the first housing 208 , and the injection hole 40 communicates with the heat exchange cavity 202 .

Taking the first housing 208 as an example to form the storage chamber 201, the first housing 208 and the second housing 209 stacked means that the second housing 209 wraps around the first housing 208, and the first housing The gap between 208 and the second shell 209 is the heat exchange cavity 202 . The injection hole 40 refers to the through-hole structure that runs through the second casing 209 along the thickness direction of the second casing 209. In use, the heat exchange fluid can be replenished or withdrawn from the heat exchange cavity 202 through the injection hole 40, or The pressure in the heat exchange chamber 202 is controlled by supplementing or withdrawing gas into the heat exchange chamber 202 .

It can be understood that a supporting structure may also be provided between the first housing 208 and the second housing 209 , and the supporting structure is used to support the relative position between the first housing 208 and the second housing 209 .

Optionally, the channel 301 in the lug outlet hole 30 runs through the first housing 208 and the second housing 209 to realize the communication between the receiving cavity 201 and the outside of the covering body 20, and the two ends of the hole body 302 surrounding the channel 301 can be respectively It is connected with the first housing 208 and the second housing 209 , and at the same time, the hole 301 can serve as a supporting structure between the first housing 208 and the second housing 209 .

Exemplarily, the first casing 208 is used to wrap the outside of the bare cell 10, the second casing 209 is wrapped outside the first casing 208, and there is a certain gap between the first casing 208 and the second casing 209, That is, the heat exchange cavity 202 , the first shell 208 and the second shell 209 are connected through the hole 302 .

By arranging the first casing 208 and the second casing 209, the heat exchange cavity 202 wrapped around the bare cell 10 can be formed, so that the heat exchange fluid can move freely around the battery 100. During the actual charging process, The component that heats up in the electronic device is not only the battery 100, but may also include the CPU (central processing unit) of the electronic device. During the charging process, the temperature rise around the battery 100 will have a complicated impact on the heat exchange chamber 202. At this time, The heat exchange fluid circulating around the walls of the battery 100 can be fully utilized to balance the heat on the battery 100 and even participate in the heat conduction path of the entire electronic device to improve the overall heat conduction efficiency of the electronic device.

Fig. 8 is a schematic structural diagram of a temperature control system in some embodiments of the present application.

As shown in FIG. 8 , according to some embodiments of the present application, the battery 100 also includes a vacuum pump 140 connected to the injection hole 40 for adjusting the vacuum degree in the heat exchange chamber 202 and controlling the heat exchange in the heat exchange chamber 202. The phase transition temperature of the fluid.

By setting the vacuum pump 140, the degree of vacuum in the heat exchange chamber 202 can be changed, thereby changing the phase change temperature of the heat exchange fluid, so that the phase change temperature of the heat exchange fluid is more suitable for the charging process, such as reducing the phase change temperature of the heat exchange fluid To the temperature that the bare cell 10 can reach during the charging process, the latent heat of vaporization of the heat exchange fluid is fully utilized.

Optionally, the vacuum pump 140 can be integrated into the battery 100 using a miniature vacuum pump, or it can be installed separately from the battery 100. For example, referring to the design of the charging head, when it is necessary to change the vacuum degree in the heat exchange chamber 202, the vacuum pump 140 and the injector Holes 40 are connected.

As shown in Figure 8, according to some embodiments of the present application, the battery 100 also includes a temperature control system, the temperature control system includes a vacuum gauge 120, a thermometer 130 and a control circuit 110, and the vacuum gauge 120 is used to measure the vacuum in the heat exchange chamber 202 temperature, the thermometer 130 is used to measure the temperature of the battery 100, and the control circuit 110 is used to control the vacuum pump 140 to adjust the vacuum degree in the heat exchange chamber 202 according to the temperature of the battery 100, and to carry out the phase change temperature of the heat exchange fluid in the heat exchange chamber 202. adjust.

Optionally, multiple heat dissipation modes can be recorded in the control circuit 110, and the control circuit 110 can control the operation of the vacuum pump 140 according to the selected heat dissipation mode, adjust the heat exchange fluid to the corresponding phase change temperature, and make the battery 100 perform the corresponding mode. heat dissipation.

Exemplarily, the cooling mode can include timing cooling, that is, cooling the battery 100 at a specific time. Taking the charging process as an example, if it can be set to cooling 10 minutes after the charging starts, then when the corresponding time is reached, the control circuit 110 Obtain the current temperature value of the battery 100, according to the current temperature value of the battery 100 and the specific heat capacity of the heat exchange fluid, etc., determine the pressure value required for the phase transition of the heat exchange fluid at the current temperature of the battery 100, and then adjust the heat exchange by controlling the vacuum pump 140 When the pressure in the cavity 202 reaches the aforementioned pressure value, the rapid heat dissipation of the battery 100 can be achieved by using the latent heat of vaporization value.

Exemplarily, the heat dissipation mode may include constant temperature heat dissipation, that is, to dissipate heat from the battery 100 at a specific temperature, such as setting the temperature of the battery 100 to 40°C to dissipate heat. Since the heat dissipation temperature is known, it can be determined according to the specific heat capacity of the heat exchange fluid. The pressure value required for the phase change of the heat exchange fluid at the heat dissipation temperature, when the corresponding temperature is reached, the control circuit 110 controls the vacuum pump 140 to adjust the pressure in the heat exchange chamber 202 to the aforementioned pressure value, so as to achieve rapid cooling of the battery 100 by using the latent heat of vaporization value. Heat dissipation.

Fig. 9 is a schematic flowchart of a method for determining parameters of the battery 100 in some embodiments of the present application.

As shown in FIG. 9, according to some embodiments of the present application, a method for determining parameters of a battery 100 is provided, which is used for any of the above-mentioned batteries 100. The method includes:

S101. According to the charging current and charging impedance, obtain the heat generated when the battery 100 is charged;

S102. Obtain the quality parameters of the heat exchange fluid in the heat exchange chamber 202 according to the amount of heat, the specific heat capacity of the heat exchange fluid, the preset temperature value, and the latent heat of vaporization value of the heat exchange fluid;

S103. Obtain the vaporization expansion volume of the heat exchange fluid in the heat exchange chamber 202 according to the preset air pressure value, quality parameter and preset temperature value of the battery 100;

S104. Obtain the gap value of the heat exchange chamber 202 and the thickness of the cladding body 20 according to the vaporization expansion volume.

Through S101, the charging heat of the battery 100 can be obtained, and after the charging heat is obtained, it can be brought into S102 to obtain the specific quality of the heat exchange fluid used in the heat exchange chamber 202, and then through S103, the vaporization expansion volume can be obtained, and finally, it can be calculated through S104 The gap value of the heat exchange cavity 202 and the thickness of the covering body 20 make the design of the heat exchange cavity 202 more suitable for the actual heat dissipation work and make full use of the volume of the battery 100 .

In practical application, the property of the battery 100 itself is known, and the heat Q generated when the battery 100 is charged within the unit charging time t can be calculated through the electrothermal conversion formula, Q=I ² Rt, I is the charging current, and R is the charging impedance, and According to the node temperature of the battery 100 that requires a significant heat dissipation effect, the phase transition temperature of the heat exchange fluid is set. According to the thermodynamic formula, Q=cm(T1-T2), c is the specific heat capacity of the heat exchange fluid, m is the mass of the heat exchange fluid, T1 is the phase change temperature, T2 is the initial temperature of the heat exchange fluid, such as normal temperature (can be 25°C), to obtain a suitable range of specific heat capacity, it is convenient to determine the selection of heat exchange fluid.

In S101, the charging impedance can be directly obtained according to the signal of the battery 100, and the charging current can be directly obtained according to the charging specification or measured during the actual charging process. After obtaining the charging current and charging impedance, the charging of the battery 100 can be calculated by using the thermodynamic formula. heat generated when.

In S102, the specific heat capacity, preset temperature and latent heat of vaporization of the heat exchange fluid are the physical and chemical properties of the heat exchange fluid itself, which can be directly obtained according to the selection of the heat exchange fluid. For example, when the heat exchange fluid is water, it can be obtained through the physical and chemical properties of the water , to directly obtain the specific heat capacity of water, the preset temperature value, and the latent heat of vaporization value, wherein the latent heat of vaporization can be a collection of latent heats of vaporization of water under different pressure conditions.

In S103, the preset temperature value refers to the temperature at which the heat exchange fluid undergoes phase transition, and the preset air pressure value refers to the pressure value in the heat exchange chamber 202 corresponding to the preset temperature value. Exemplarily, S103 can be calculated according to PV=nRT, wherein V is the vaporization expansion volume, P is a preset pressure value, n is a quality parameter, T is a preset temperature value, and R is an ideal gas constant. Through the above calculation process, under the premise that the quality parameters of the heat exchange fluid and the ideal gas constant R are fixed, and the range of the phase transition temperature is known, the volume of the heat exchange fluid and the pressure value in the heat exchange chamber 202 can be reasonably regulated to ensure While the heat exchange fluid has a high heat exchange effect, the heat exchange chamber 202 has high safety in use.

In S104, according to the vaporization expansion volume, the volume of the heat exchange chamber 202 can be obtained. For example, the vaporization expansion volume can be directly equal to the volume of the heat exchange chamber 202, and then can be obtained according to the size of the battery 100. The specific setting gap of the heat exchange chamber 202 is in After the clearance of the heat exchange cavity 202 is determined, the thickness of the covering body 20 is obtained according to the relevant strength requirement.

It can be understood that, according to the different materials selected for the cladding body 20 and the heat exchange fluid, the above method can be used to obtain the corresponding gap value of the heat exchange cavity 202 and the thickness of the cladding body 20 .

Exemplarily, the specific material properties of the cladding body 20, such as tensile strength, fracture strength, etc., can significantly enhance the mechanical strength of the cladding body 20 obtained, thereby reducing the thickness of the cladding body 20, which is a significant contribution to the heat exchange chamber 202. The setting provides spatial support.

For example, since the size of the battery 100 in its thickness direction is greatly limited by the size of the electronic device, it may also be considered to move the location of the heat exchange chamber 202 to the end of the battery 100 in the length direction, such as in the battery 100 A plurality of heat exchange cavities 202 are stacked at the ends in the length direction to reduce the thickness of the battery 100 , thereby reducing the thickness of the electronic device.

According to some embodiments of the present application, an electronic device is provided, including any battery 100 described above.

Fig. 10 is a schematic structural diagram of a battery 100 in an electronic device according to some embodiments of the present application.

As shown in FIG. 10 , according to some embodiments of the present application, the electronic device further includes a graphite sheet 300 disposed on one side of the battery 100 and a vapor chamber 200 disposed on the other side of the battery 100;

The covering body 20 includes a connected first part 203 , a second part 204 and a third part 205 , and the first part 203 , the second part 204 and the third part 205 enclose to form a receiving cavity 201 ;

The first part 203 and the second part 204 are located on opposite sides of the battery 100, the third part 205 connects the first part 203 and the second part 204, the heat exchange cavity 202 is arranged on the first part 203, and the heat exchange cavity 202 passes through the first part 203 The third part 205 extends to the second part 204 ; the first part 203 is located between the graphite sheet 300 and the bare cell 10 , and the second part 204 is located between the bare cell 10 and the vapor chamber 200 .

The vapor chamber 200 refers to a heat dissipation component of a complete electronic device, such as a heat dissipation component VC of a CPU.

The graphite sheet 300 refers to the heat dissipation component of the complete electronic device, for example, it may be a heat dissipation graphite sheet 300 PSG.

When charging, the heat circulation in the electronic device can be conducted from the bare cell 10 through the heat exchange chamber 202 to the graphite sheet 300, and then transferred from the graphite sheet 300 to the outside of the electronic device, or it can also be passed from the bare cell 10 through the heat exchange chamber 202 to the vapor chamber 200, and then from the vapor chamber 200 to the outside of the electronic device along the heat dissipation path of the electronic device, which can improve the heat absorption capacity of the electronic device, and make full use of the heat conduction structure inside the electronic device to promote electronic Thermal balance inside the device.

FIG. 11 is a schematic structural diagram of a battery 100 in an electronic device according to other embodiments of the present application.

Referring to FIG. 11 , optionally, the electronic device may further include a motherboard heating element 400, a part of the vapor chamber 200 corresponds to the motherboard heating element 400, and the other part corresponds to the battery 100, and the graphite sheet 300 is arranged on the battery 100 away from the heat soaking On one side of the board 200 , a part of the graphite sheet 300 corresponds to the battery 100 , and the other part corresponds to the heating element 400 of the main board.

The mainboard heating element 400 is a heating component on the mainboard of an electronic device. Taking a smart phone as an example, the mainboard heating element 400 may be a CPU.

When charging, the heat cycle in the electronic device can be transferred from the bare cell 10 to the graphite sheet 300 through the heat exchange chamber 202, and then transferred from the graphite sheet 300 to the outside of the electronic device, or it can also be passed from the bare cell 10 through the heat exchange chamber 202 to the vapor chamber 200, and then from the vapor chamber 200 to the main board heating element 400, and then from the main board heating element 400 to the outside of the electronic device through the graphite sheet 300, which can improve the heat absorption capacity of the electronic device and make full use of The heat conduction structure inside the electronic device, and because the heat exchange fluid in the heat exchange chamber 202 can flow, the battery 100 can serve as the core structure of the heat conduction path in the electronic device, and promote the heat balance of the electronic device.

In the description of this specification, references to the terms "one embodiment," "some embodiments," "exemplary embodiments," "example," "specific examples," or "some examples" are intended to mean that the implementation A specific feature, structure, material, or characteristic described by an embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although the embodiments of the present application have been shown and described, those skilled in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present application. The scope of the application is defined by the claims and their equivalents.

Claims (10)

1. A battery, comprising:

a naked battery cell;

the cladding body surrounds to form an accommodating cavity for accommodating the naked battery cell;

still be equipped with the heat transfer chamber in the cladding body, the heat transfer chamber with accept the chamber and separate the setting, the heat transfer intracavity is filled and is had the heat transfer fluid, be used for with naked electric core heat exchange, the heat transfer fluid is hot phase change material.

2. The battery of claim 1, wherein the cladding includes first and second oppositely disposed portions, the heat exchange cavity being disposed within at least one of the first and second portions.

3. The battery of claim 2, wherein the enclosure further comprises a third portion being at least one side surface connecting the first portion and the second portion, the heat exchange cavity being disposed in the first portion and extending into the second portion through the third portion.

4. The battery of claim 3, wherein the bare cell includes a tab, the third portion includes an extraction end surface facing the tab, the heat exchange cavity is disposed in the extraction end surface, the extraction end surface is provided with a tab extraction hole communicating the accommodation cavity and the outside of the clad body, the tab extraction hole is separated from the heat exchange cavity, and the tab is extracted from the clad body through the tab extraction hole.

5. The battery according to claim 1, wherein the sheathing body comprises a first shell and a second shell which are stacked, the first shell and the second shell enclose the heat exchange cavity, and an injection hole is formed in the first shell and communicated with the heat exchange cavity.

6. The battery of claim 5, further comprising a vacuum pump connected to the injection hole for adjusting a vacuum level in the heat exchange chamber and controlling a phase transition temperature of the heat exchange fluid in the heat exchange chamber.

7. The battery of claim 6, further comprising a temperature control system, wherein the temperature control system comprises a vacuum gauge, a thermometer and a control circuit, the vacuum gauge is used for measuring the vacuum degree in the heat exchange cavity, the thermometer is used for measuring the temperature of the battery, and the control circuit is used for controlling the vacuum pump to adjust the vacuum degree in the heat exchange cavity according to the temperature of the battery so as to adjust the phase change temperature of the heat exchange fluid in the heat exchange cavity.

8. A method for determining parameters of a battery, for use in a battery according to any of claims 1-7, the method comprising:

obtaining the heat generated when the battery is charged according to the charging current and the charging impedance;

obtaining the quality parameters of the heat exchange fluid in the heat exchange cavity according to the heat, the specific heat capacity of the heat exchange fluid, a preset temperature value and the latent heat value of vaporization of the heat exchange fluid;

obtaining the vaporization expansion volume of the heat exchange fluid in the heat exchange cavity according to the preset air pressure value, the mass parameter and the preset temperature value of the battery;

and obtaining the gap value of the heat exchange cavity and the thickness of the cladding body according to the vaporization expansion volume.

9. An electronic device comprising the battery according to any one of claims 1 to 7.

10. The electronic device according to claim 9, further comprising a graphite sheet provided on one side of the battery and a heat spreader provided on the other side of the battery;

the cladding body comprises a first part, a second part and a third part which are connected, and the first part, the second part and the third part are enclosed to form the accommodating cavity;

the first part and the second part are positioned at two opposite sides of the battery, the third part is connected with the first part and the second part, the heat exchange cavity is arranged at the first part, and the heat exchange cavity extends from the first part to the second part through the third part; the first part is located between the graphite sheet and the naked electric core, and the second part is located between the naked electric core and the soaking plate.

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