CN220290888U - Core package and lithium battery - Google Patents

Abstract

The utility model relates to a core pack and a lithium battery, wherein the core pack comprises a core pack body and a protective film, the protective film is wrapped on the outer surface of the core pack body, an accommodating cavity is formed in the protective film, a temperature sensor and/or a pressure sensor are arranged in the accommodating cavity, the temperature sensor is used for monitoring the temperature change of the core pack body, and the pressure sensor is used for monitoring the swelling state of the core pack body. Because the position of the temperature sensor is close to the core pack body, the temperature value detected by the temperature sensor is matched with the actual temperature of the core pack body. The pressure sensor can detect extrusion force between the core pack body and the shell, and pressure data detected by the pressure sensor is matched with the actual bulge state of the core pack body. Therefore, when a short circuit accident occurs in the lithium battery, the external safety management system can timely perform cooling intervention or pressure relief intervention on the lithium battery, so that the occurrence of thermal runaway accident of the lithium battery due to untimely intervention is avoided, and the safety of the whole lithium battery is further improved.

Description

Core package and lithium battery

Technical Field

The utility model relates to the technical field of battery manufacturing, in particular to a core pack and a lithium battery comprising the same.

Background

The lithium battery is widely applied to equipment such as electric vehicles, communication base stations, emergency equipment and the like as energy storage equipment. A common type of square lithium battery mainly includes a case and a core pack mounted inside the case. The core pack is used for storing electric energy and comprises a plurality of positive plates, negative plates and diaphragms which are stacked together in a certain sequence. The core pack generates a large amount of heat during charge and discharge and when a short circuit occurs in the circuit, and simultaneously, the bulge phenomenon occurs. In order to ensure the working performance and prolong the service life of the lithium battery, in the related art, a temperature sensor is arranged at the pole position of the lithium battery or on a terminal strip used for connecting a plurality of lithium batteries in series, and the temperature change of the lithium battery is monitored in real time through the temperature sensor; and installing a pressure sensor between two adjacent lithium batteries, and monitoring the swelling state of the lithium batteries in real time through the pressure sensor. The safety management system of the lithium battery is convenient for performing real-time cooling intervention or pressure relief intervention and the like on the lithium battery according to the temperature monitoring data and the pressure monitoring data, and further avoiding thermal runaway of the lithium battery.

The lithium battery of the related art has the following disadvantages: since the internal temperature of the lithium battery is higher than the external temperature, and heat is sequentially diffused outwards from the core pack inside the lithium battery, the temperature value detected by the temperature sensor is lower than the actual temperature value of the core pack. When the detected temperature of the temperature sensor reaches the set temperature of the safety management system, the actual temperature of the core pack exceeds the set temperature, so that intervention delay is caused, and thermal runaway of the lithium battery is caused when serious. Meanwhile, the shell of the lithium battery is made of an aluminum plate, so that the lithium battery has certain mechanical strength, and the pressure value detected by the pressure sensor is lower than the actual pressure of the bulge of the core, and intervention delay is caused.

Disclosure of Invention

The utility model aims to provide a core pack and a lithium battery, which can intervene in time when a short-circuit accident occurs in the lithium battery, avoid thermal runaway and have high safety.

To achieve the purpose, the utility model adopts the following technical scheme:

the utility model provides a core package, includes core package body and protection film, the protection film parcel is in the surface of core package body, the inside of protection film has the chamber of holding, hold the intracavity and be provided with temperature sensor and/or pressure sensor, temperature sensor is used for monitoring the temperature variation of core package body, pressure sensor is used for monitoring the bulge state of core package body.

Further, the protective film comprises a base film layer and a protective layer which are mutually overlapped, and the accommodating cavity is formed between the base film layer and the protective layer.

Further, the protection film still includes the tie coat, the tie coat is located the base membrane layer with between the inoxidizing coating, the base membrane layer with the inoxidizing coating passes through the tie coat bonding is fixed, just temperature sensor with pressure sensor all with the tie coat interval.

Further, the base film layer and one side surface of the protective layer, which is opposite to the protective layer, are mutually adhered and fused together.

Further, the thickness of the base film layer is larger than that of the protective layer;

when the temperature sensor is arranged in the protective film, the protective layer is positioned at one side close to the core pack body;

when the pressure sensor is arranged in the protective film, the base film layer is positioned on one side close to the core pack body.

Further, the core package body is the cuboid structure, the protection film includes two first diaphragms, two first diaphragms are used for the parcel respectively two biggest sides in area of core package body, temperature sensor with pressure sensor sets up in at least one on the first diaphragm.

Further, the protection film still includes temperature signal transmission terminal, pressure signal transmission terminal, first wire and second wire, temperature signal transmission terminal with pressure signal transmission terminal interval set up in the week portion of first diaphragm, temperature sensor passes through first wire with temperature signal transmission terminal is connected, pressure sensor passes through the second wire with pressure signal transmission terminal is connected.

Further, a plurality of monitoring components are arranged on the first diaphragm, the monitoring components are distributed at intervals along the first direction, and each monitoring component comprises at least one temperature sensor and at least one pressure sensor.

Further, the monitoring assembly comprises a plurality of temperature sensors and a plurality of pressure sensors, and the temperature sensors and the pressure sensors are distributed in a staggered mode.

A lithium battery is also provided, including a housing having an installation cavity and a core pack disposed within the installation cavity.

Further, the shell is a cuboid structure, and the ratio of the length dimension to the height dimension of the shell is 6:5-2:1, wherein the ratio of the height dimension to the width dimension of the shell is 2:1-25:7.

compared with the prior art, the utility model has the beneficial effects that: by arranging the temperature sensor in the protective film, the temperature value detected by the temperature sensor is matched with the actual temperature of the core pack body because the position of the temperature sensor is close to the core pack body. And through setting up pressure sensor in the protection film, when the core package body takes place the bulge, pressure sensor can detect the extrusion force between core package body and the shell, and pressure data that pressure sensor detected matches with the actual bulge state of core package body. Therefore, when a short circuit accident occurs in the lithium battery, the external safety management system can timely implement cooling intervention or pressure relief intervention on the lithium battery according to the monitoring data of the temperature sensor and the pressure sensor, so that the occurrence of a thermal runaway accident of the lithium battery due to untimely intervention is avoided, and the safety of the whole lithium battery is further improved.

Drawings

Fig. 1 is an exploded view of a lithium battery according to an embodiment of the present utility model.

Fig. 2 is a cross-sectional view of a lithium battery according to an embodiment of the present utility model.

Fig. 3 is a partial cross-sectional view of a protective film according to an embodiment of the present utility model.

Fig. 4 is a partial cross-sectional view of a protective film according to another embodiment of the present utility model.

Fig. 5 is an expanded schematic view of a protective film according to an embodiment of the present utility model.

In the figure:

1. a core pack; 11. a core pack body; 12. a protective film; 120. a receiving chamber; 121. a first membrane; 122. a second membrane; 123. a third membrane; 124. a base film layer; 125. a protective layer; 126. a bonding layer; 127. a temperature signal transmission terminal; 128. a pressure signal transmission terminal; 129. a wire; 13. a temperature sensor; 14. a pressure sensor; 2. a housing; 21. a lower housing; 22. a top cover assembly; 221. a cover plate; 222. a pole.

Detailed Description

In order to make the technical problems solved, the technical scheme adopted and the technical effects achieved by the utility model more clear, the technical scheme of the utility model is further described below by a specific embodiment in combination with the attached drawings.

As shown in fig. 1 and 2, the present utility model provides a core pack 1. The core pack 1 is an important component of a lithium battery, which is used for storing electric energy. The lithium battery further comprises a shell 2, wherein a closed installation cavity is formed in the shell 2, and the core pack 1 is accommodated in the installation cavity of the shell 2. And the electrolyte is filled in the mounting cavity, and can infiltrate the core pack 1 and participate in electrochemical reaction of the core pack 1. The core pack 1 includes a core pack body 11, a protective film 12, a temperature sensor 13, and a pressure sensor 14. The core pack body 11 includes a plurality of positive electrode sheets, negative electrode sheets, and separators, and the plurality of positive electrode sheets, negative electrode sheets, and separators are stacked together in a certain order. The protective film 12 is a thin film structure made of flexible material, which can be freely bent and folded. The protective film 12 wraps the outer surface of the core pack body 11, and plays roles in binding shaping and mechanical protection of the core pack body 11. The protective film 12 has a housing chamber 120 inside, and the temperature sensor 13 and the pressure sensor 14 are installed in the housing chamber 120. The temperature sensor 13 is used for detecting the temperature of the core pack body 11 so as to realize real-time monitoring of the temperature change of the core pack body 11; when the core pack body 11 bulges during operation, the core pack body 11 pushes the pressure sensor 14 toward the wall of the installation cavity, and presses between the pressure sensor 14 and the housing 2. The pressure sensor 14 is used for detecting the extrusion force between the core pack body 11 and the shell 2 so as to realize real-time monitoring of the bulge state of the core pack body 11.

It will be appreciated that during operation of the lithium battery, electrochemical reactions take place on the core pack body 11, and the core pack body 11 generates heat to raise its temperature. When a short-circuit accident occurs in the lithium battery, the temperature of the core pack body 11 increases sharply, and the phenomena of swelling and air pressure increase occur. By providing the temperature sensor 13 in the protective film 12, since the position of the temperature sensor 13 is close to the core pack body 11, the temperature value detected by the temperature sensor 13 matches the actual temperature of the core pack body 11. And, by providing the pressure sensor 14 in the protective film 12, when the core pack body 11 is inflated, the pressure sensor 14 can detect the pressing force between the core pack body 11 and the outer case 2, and the pressure data detected by the pressure sensor 14 matches with the actual inflated state of the core pack body 11. Therefore, when a short-circuit accident occurs in the lithium battery, the external safety management system can timely implement cooling intervention or pressure relief intervention on the lithium battery according to the monitoring data of the temperature sensor 13 and the pressure sensor 14, so that the occurrence of a thermal runaway accident of the lithium battery due to untimely intervention is avoided, and the safety of the whole lithium battery is further improved.

When a short-circuit accident occurs in the lithium battery, the core pack body 11 may have the phenomena of temperature rise, bulge, air pressure rise, and the like. The single temperature monitoring data or the single pressure temperature monitoring data can be used as the judgment basis for whether the safety management system performs intervention. Therefore, the temperature sensor 13 may be provided only in the protective film 12, the pressure sensor 14 may be provided only in the protective film 12, and the temperature sensor 13 and the pressure sensor 14 may be provided simultaneously in the protective film 12.

Specific applications include, but are not limited to, the following three embodiments:

in the first embodiment, a temperature sensor 13 is provided in the protective film 12, and the temperature sensor 13 is used to monitor the temperature change of the core pack body 11. The temperature sensor 13 is electrically connected with an external safety management system, and the safety management system receives the monitoring data of the temperature sensor 13 and processes the monitoring data. When the temperature value detected by the temperature sensor 13 does not exceed the set temperature, it is determined that the core pack 1 is operating normally. When the temperature value detected by the temperature sensor 13 exceeds the set temperature, the safety management system performs cooling intervention or pressure relief intervention on the whole lithium battery, so that overtemperature and overpressure accidents of the lithium battery are avoided, and further thermal runaway of the lithium battery is avoided.

In the second embodiment, a pressure sensor 14 is disposed in the protective film 12, and the pressure sensor 14 is used for monitoring the bulge state of the core pack body 11. The pressure sensor 14 is electrically connected to an external safety management system, and the safety management system receives the monitoring data of the pressure sensor 14 and processes the monitoring data. When the pressure value detected by the pressure sensor 14 does not exceed the set pressure, it is determined that the core pack 1 is in normal operation. When the pressure value detected by the pressure sensor 14 exceeds the set pressure, the safety management system performs cooling intervention or pressure relief intervention on the whole lithium battery, so that the over-temperature and over-pressure accidents of the lithium battery are avoided, and further the thermal runaway of the lithium battery is avoided.

In the third embodiment, a temperature sensor 13 and a pressure sensor 14 are provided in the protective film 12, the temperature sensor 13 is used for detecting the temperature change of the core pack body 11, and the pressure sensor 14 is used for monitoring the swelling state of the core pack body 11. The temperature sensor 13 and the pressure sensor 14 are electrically connected with an external safety management system, and the safety management system receives monitoring data of the temperature sensor 13 and the pressure sensor 14 and processes the monitoring data. When the temperature value detected by the temperature sensor 13 and the pressure value detected by the pressure sensor 14 do not exceed the set threshold values, it is determined that the core pack 1 is in normal operation as a temperature change and a bulge change. When at least one of the temperature value detected by the temperature sensor 13 and the pressure value detected by the pressure sensor 14 exceeds a set threshold, the safety management system performs cooling intervention or pressure relief intervention on the whole lithium battery, so that overtemperature and overpressure accidents of the lithium battery are avoided, and further thermal runaway of the lithium battery is avoided.

The temperature sensor 13 comprises a temperature electrode plate, and the temperature measurement principle of the temperature sensor 13 is that the temperature change of the temperature electrode plate causes the resistance change of the temperature electrode plate, so that the temperature sensor 13 outputs a corresponding electric signal. The pressure sensor 14 comprises a pressure electrode plate, and the pressure measuring principle of the pressure sensor 14 is that the resistance of the pressure electrode plate is changed due to the deformation of the pressure electrode plate, so that the pressure sensor 14 outputs a corresponding electric signal. The thickness of the temperature electrode sheet and the pressure electrode sheet is selected to be 30 μm to 100 μm.

Alternatively, referring to fig. 3, the protective film 12 includes a base film layer 124 and a protective layer 125, and the base film layer 124 and the protective layer 125 are stacked on each other. The base film layer 124 and the shielding layer 125 form the accommodating chamber 120 therebetween. Since the temperature sensor 13 and the pressure sensor 14 are installed in the accommodating chamber 120, the base film layer 124 and the protective layer 125 can provide protection for the temperature sensor 13 and the pressure sensor 14.

The protective film 12 further includes an adhesive layer 126, where the adhesive layer 126 is located between the base film layer 124 and the protective layer 125, and the base film layer 124 and the protective layer 125 are adhered and fixed by the adhesive layer 126. The adhesive layer 126 is a nonwoven substrate, PET, hot melt adhesive film, or the like. The adhesive layer 126 is in a mesh shape and is distributed between the base film layer 124 and the protective layer 125, so that the base film layer 124, the protective layer 125 and the adhesive layer 126 enclose the accommodating cavity 120. Adhesive layer 126 is spaced from temperature sensor 13 and pressure sensor 14 to avoid adhesive layer 126 from affecting performance by contacting temperature sensor 13 and pressure sensor 14.

Alternatively, referring to fig. 4, the protective film 12 includes a base film layer 124 and a protective layer 125, and the base film layer 124 and the protective layer 125 are bonded to each other at opposite sides thereof and fused together by a thermoplastic process or a thermal fusion process. The areas between the base film layer 124 and the protective layer 125, where the temperature sensor 13 and the pressure sensor 14 are correspondingly disposed, are spaced apart from each other and form the accommodating chamber 120.

In an alternative embodiment, a plurality of temperature sensors 13 and pressure sensors 14 are provided within the protective film 12. The sum of the number of temperature sensors 13 and pressure sensors 14 is equal to the number of accommodation chambers 120, i.e. only one temperature sensor 13 or pressure sensor 14 is provided in each accommodation chamber 120. Of course, in other embodiments, the sum of the number of the temperature sensors 13 and the pressure sensors 14 may be larger than the number of the accommodating chambers 120, that is, a plurality of the temperature sensors 13 or the pressure sensors 14 are provided in each accommodating chamber 120.

Optionally, the thickness of the base film layer 124 is greater than the thickness of the protective layer 125. The temperature sensor 13 is arranged between the base film layer 124 and the protective layer 125, and at least one of the base film layer 124 and the protective layer 125 is adhered and fixed with the temperature sensor 13; the pressure sensor 14 is also mounted between the base film layer 124 and the protective layer 125, at least one of the base film layer 124 and the protective layer 125 being adhesively secured to the pressure sensor 14. When the temperature sensor 13 is provided in the protective film 12, the protective layer 125 is located on the side close to the core pack body 11. This structure is favorable to making the interval between temperature sensor 13 and the core package body 11 relatively less for the temperature value that temperature sensor 13 detected is close more to the actual temperature of core package body 11, promotes the accuracy to the temperature monitoring of core package body 11. When the pressure sensor 14 is provided in the protective film 12, the base film layer 124 is located on the side close to the core pack body 11. This structure is advantageous in that the distance between the pressure sensor 14 and the core pack body 11 is relatively large, so as to reduce the thermal influence of the pressure sensor 14 on the core pack body 11, and avoid the influence of the thermal deformation of the pressure sensor 14 on the working performance thereof. In other embodiments, when the temperature sensor 13 and the pressure sensor 14 are disposed in the protective film 12, the thickness of the base film layer 124 is the same as that of the protective layer 125, and any side of the protective film 12 may be located on the side close to the core pack body 11, and the working performance of the temperature sensor 13 and the pressure sensor 14 can be considered.

Alternatively, as shown with reference to fig. 1 and 5, the lithium battery in the present embodiment is a prismatic battery. Correspondingly, the core pack body 11 has a rectangular parallelepiped structure. The protective film 12 is wrapped around the outer surface of the core pack body 11 such that the shape of the protective film 12 matches the shape of the core pack body 11. Along the thickness direction (Y direction in the drawing) of the core pack body 11, the two opposite side areas on the core pack body 11 are the largest, namely, the two large faces of the core pack body 11. The protective film 12 includes a first film 121, a second film 122, and a third film 123. The two first films 121 are used for wrapping two large surfaces of the core pack body 11 respectively. Along the height direction (the Z direction in the drawing) of the core pack body 11, one side surface of the core pack body 11 is provided with a tab, and therefore, one side surface of the core pack body 11 having a tab does not need to be provided with a protective film 12, so that the installation of the tab is facilitated. The number of the second diaphragms 122 is one, the second diaphragms 122 are located between the two first diaphragms 121, and the second diaphragms 122 are used for wrapping one side surface of the core pack body 11, which faces away from the tab. The number of the third films 123 is at least two, and the two third films 123 are respectively used for wrapping two side surfaces distributed along the length direction (X direction in the drawing) of the core pack body 11. In order to ensure the stability of the protection film 12 wrapped on the core pack body 11, four third films 123 may be disposed, that is, the opposite sides of each first film 121 are provided with the third films 123.

Alternatively, the temperature sensor 13 and the pressure sensor 14 may be provided on one of the first diaphragms 121, or on both of the first diaphragms 121. In the present embodiment, the temperature sensor 13 and the pressure sensor 14 are provided on both the first diaphragms 121. The area of the first diaphragm 121 is maximized, and it is possible to provide a sufficient space for installation of the temperature sensor 13 and the pressure sensor 14. Of course, in other embodiments, the temperature sensor 13 and the pressure sensor 14 may be provided on at least one of the first diaphragm 121, the second diaphragm 122, and the third diaphragm 123.

In practical applications, the number and distribution positions of the temperature sensor 13 and the pressure sensor 14 can be flexibly selected according to the temperature distribution situation and the distribution situation of the bulge position on the first membrane 121, so as to achieve the purposes of realizing comprehensive monitoring and saving cost.

Optionally, the first membrane 121 is provided with a plurality of monitoring components, and the plurality of monitoring components are distributed at intervals along the height direction (i.e. the first direction) of the core pack body 11. Each detection assembly comprises at least one temperature sensor 13 and a pressure sensor 14. In an alternative embodiment, the temperature sensor 13 and the pressure sensor 14 are plural and the number of them is the same. The plurality of temperature sensors 13 and the pressure sensors 14 are distributed at intervals along the longitudinal direction (X direction in the drawing) of the core pack body 11. The temperature sensors 13 and the pressure sensors 14 are distributed in a staggered manner, namely, one pressure sensor 14 is arranged between two adjacent temperature sensors 13, and one temperature sensor 13 is arranged between two adjacent pressure sensors 14. This structure is advantageous in increasing the interval between the adjacent two temperature sensors 13 or the adjacent two pressure sensors 14, and avoiding occurrence of signal crosstalk.

Optionally, the protective film 12 further includes a temperature signal transmission terminal 127, a pressure signal transmission terminal 128, and a wire 129. Wherein the temperature signal transmission terminal 127 is used for transmitting the monitoring data of the temperature sensor 13 to an external safety management system, and the pressure signal transmission terminal 128 is used for transmitting the monitoring data of the pressure sensor 14 to the external safety management system. The temperature signal transmission terminal 127 and the pressure signal transmission terminal 128 are disposed at intervals on the peripheral portion of the first membrane 121, and both are located at one end near the tab of the core pack body 11 so as to be connected with an external safety management system. The wires 129 include first wires and second wires, the number of the first wires being matched to the number of the temperature sensors 13 so that each of the temperature sensors 13 is connected to the temperature signal transmission terminal 127 through the corresponding first wire; the number of second wires matches the number of pressure sensors 14 such that each pressure sensor 14 is connected to a pressure signal transmission terminal 128 by a corresponding second wire.

The wire 129 is a metal wire, the wire 129 is a flat wire or a round wire, and the wire 129 is made of copper, nickel, silver, or the like, preferably a copper wire.

As shown in fig. 1 and 2, the present utility model also provides a lithium battery including a core pack 1 and a case 2. The lithium battery is a square battery, and correspondingly, the shell 2 and the core pack 1 are both in a cuboid structure. The shell 2 is an aluminum shell or a steel shell, the inside of the shell 1 is provided with an installation cavity, and the core pack 1 is accommodated in the installation cavity. The mounting cavity is also filled with electrolyte, and the electrolyte is used for infiltrating the core pack body 11 in the core pack 1. In the running process of the lithium battery, when the core pack body 11 is inflated, the core pack body 11 moves towards the cavity wall of the installation cavity and presses the pressure sensor 14, and the pressure sensor 14 detects the extrusion force between the core pack body 11 and the shell 2, so that the inflation state of the core pack 1 is monitored in real time. Meanwhile, the temperature sensor 13 in the core pack 1 monitors the temperature of the core pack body 11 in real time. In practical application, a plurality of lithium batteries are assembled together to form a battery pack, and a safety management system is further arranged in the battery pack, wherein the safety management system comprises a controller, a data processor, an explosion-proof unit, a cooling unit and the like. The safety management system receives the monitoring data of the temperature sensor 13 and the pressure sensor 14, and controls the explosion-proof unit and the cooling unit to implement pressure relief intervention and cooling intervention on the lithium battery with overtemperature and overpressure. Because the temperature sensor 13 and the pressure sensor 14 are arranged in the protective film 12, the temperature sensor 13 and the pressure sensor can be close to the core pack body 11 and the inspection data of the temperature sensor and the pressure sensor are consistent with the actual state of the core pack body 11, when the core pack 1 is overtemperature or superpressure, the safety management system can timely acquire the accurate monitoring data of the core pack body 11 and timely perform intervention, and the thermal runaway accident of the lithium battery is avoided. Thereby being beneficial to ensuring the working performance of the lithium battery and prolonging the service life of the lithium battery.

Specifically, the case 2 includes a lower case 21 and a top cap assembly 22 mounted on top of the lower case 21, and the top cap assembly 22 includes a cap plate 221 and a pole 222. The cover 221 covers the top of the lower case 21, and forms a mounting cavity between the cover 221 and the lower case 21. The number of the poles 222 is two, and the two poles are respectively a positive pole and a negative pole. The two pole posts 222 are disposed on the cover 221 at intervals, and the pole posts 222 are electrically connected with external electrical equipment. The core pack body 11 is provided with a positive electrode lug and a negative electrode lug, the positive electrode lug is connected with a positive electrode post, and the negative electrode lug is connected with a negative electrode post.

It should be noted that, when the lithium battery is placed normally, the top cover assembly 22 is located at the top position of the lithium battery. That is, the X direction is shown as the longitudinal direction of the lithium battery, the Y direction is shown as the thickness direction of the lithium battery, and the Z direction is shown as the height direction of the lithium battery.

Optionally, the casing 2 has a rectangular parallelepiped structure, and the length, width and height of the casing 2 all correspond to those of the lithium battery. The ratio of the length dimension to the height dimension of the housing 2 is 6:5-2:1, a step of; the ratio of the height dimension to the width dimension of the housing is 2:1-25:7. the length dimension of the housing 2 is 300-400mm, and the length dimension of the housing 2 includes, but is not limited to, 300mm, 310mm, 320mm, 330mm, 340mm, 350mm, 360mm, 370mm, 380mm, 390mm, 400mm. The width dimensions of the housing 2 are 70-100mm, the width dimensions of the housing 2 including, but not limited to, 70mm, 75mm, 80mm, 85mm, 90mm, 95mm, 100mm. The height dimension of the housing 2 is 200-250mm, the height dimension of the housing 2 includes, but is not limited to, 200mm, 215mm, 220mm, 225mm, 230mm, 235mm, 240mm, 245mm, 250mm. It will be appreciated that the length to height ratio of the housing 2 is set at 6:5-2:1, the lithium battery has a larger large surface (the large surface is two opposite side surfaces in the width direction of the shell), which is beneficial to promoting the heat dissipation of the lithium battery. Under the aspect ratio of the length to the width, the shell 2 ensures that the internal space of the installation cavity is more reasonable, is beneficial to improving the utilization rate of active substances in the installation cavity, further achieves the purpose of prolonging the service cycle of the lithium battery, and meets the requirements of users on over-endurance and over-capacity.

The remarkable effect of this embodiment is: by providing the temperature sensor 13 in the protective film 12, since the position of the temperature sensor 13 is close to the core pack body 11, the temperature value detected by the temperature sensor 13 matches the actual temperature of the core pack body 11. And, by providing the pressure sensor 14 in the protective film 12, when the core pack body 11 is inflated, the pressure sensor 14 can detect the pressing force between the core pack body 11 and the outer case 2, and the pressure data detected by the pressure sensor 14 matches with the actual inflated state of the core pack body 11. Therefore, when a short-circuit accident occurs in the lithium battery, the external safety management system can timely implement cooling intervention or pressure relief intervention on the lithium battery according to the monitoring data of the temperature sensor 13 and the pressure sensor 14, so that the occurrence of a thermal runaway accident of the lithium battery due to untimely intervention is avoided, and the safety of the whole lithium battery is further improved.

The foregoing is merely exemplary of the present utility model, and those skilled in the art should not be considered as limiting the utility model, since modifications may be made in the specific embodiments and application scope of the utility model in light of the teachings of the present utility model.

Claims (11)

1. The utility model provides a core package, its characterized in that includes core package body and protection film, the protection film parcel is in the surface of core package body, the inside of protection film has the chamber of holding, it is provided with temperature sensor and/or pressure sensor to hold the intracavity, temperature sensor is used for monitoring the temperature variation of core package body, pressure sensor is used for monitoring the bulge state of core package body.

2. The core pack according to claim 1, wherein the protective film comprises a base film layer and a protective layer which are disposed on top of each other, the base film layer and the protective layer forming the accommodation chamber therebetween.

3. The core pack of claim 2, wherein the protective film further comprises an adhesive layer between the base film layer and the protective layer, the base film layer and the protective layer being adhesively secured by the adhesive layer, and the temperature sensor and the pressure sensor are both spaced from the adhesive layer.

4. The core pack of claim 2, wherein the facing sides of the base film layer and the protective layer are adhered to each other and fused together.

5. The core pack according to claim 2, wherein the thickness of the base film layer is greater than the thickness of the protective layer;

when the temperature sensor is arranged in the protective film, the protective layer is positioned at one side close to the core pack body;

when the pressure sensor is arranged in the protective film, the base film layer is positioned on one side close to the core pack body.

6. The core pack according to any one of claims 1 to 5, wherein the core pack body has a rectangular parallelepiped structure, the protective film includes two first diaphragms, the two first diaphragms are respectively used to wrap two sides of the core pack body having the largest area, and the temperature sensor and the pressure sensor are disposed on at least one of the first diaphragms.

7. The core pack according to claim 6, wherein the protective film further comprises a temperature signal transmission terminal, a pressure signal transmission terminal, a first wire and a second wire, the temperature signal transmission terminal and the pressure signal transmission terminal being provided at intervals in a peripheral portion of the first diaphragm, the temperature sensor being connected to the temperature signal transmission terminal through the first wire, the pressure sensor being connected to the pressure signal transmission terminal through the second wire.

8. The core pack of claim 6, wherein a plurality of monitoring assemblies are disposed on the first membrane, the plurality of monitoring assemblies being spaced apart along the first direction, each of the monitoring assemblies including at least one of the temperature sensors and at least one of the pressure sensors.

9. The core pack of claim 8, wherein the monitoring assembly includes a plurality of temperature sensors and a plurality of pressure sensors, the temperature sensors being staggered with respect to the pressure sensors.

10. A lithium battery comprising a housing and a core pack according to any one of claims 1 to 9, the housing having a mounting cavity within which the core pack is disposed.

11. The lithium battery of claim 10, wherein the housing has a rectangular parallelepiped configuration, and wherein the ratio of the length dimension to the height dimension of the housing is 6:5-2:1, wherein the ratio of the height dimension to the width dimension of the shell is 2:1-25:7.