CN220290889U

CN220290889U - Core package and lithium battery

Info

Publication number: CN220290889U
Application number: CN202321363190.4U
Authority: CN
Inventors: 苑丁丁; 赵红万; 车丽媛
Original assignee: Hubei Eve Power Co Ltd
Current assignee: Hubei Eve Power Co Ltd
Priority date: 2023-05-31
Filing date: 2023-05-31
Publication date: 2024-01-02
Anticipated expiration: 2033-05-31

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 wrapped on the outer surface of the core pack body, the protective film is provided with an inner side surface and an outer side surface which are opposite, the inner side surface faces the core pack body, the outer side surface faces away from the core pack body, a temperature sensor is arranged on the inner side surface and is abutted with the core pack body, and a pressure sensor is arranged on the outer side surface and is used for monitoring the swelling state of the core pack body. The temperature sensor is arranged on the inner side surface of the protective film, so that the temperature sensor can be abutted with the core pack body, and the detected temperature is matched with the actual temperature of the core pack body. The pressure sensor is arranged on the outer side surface of the protective film, so that the detected pressure data is matched with the actual bulge state of the core bag body. The temperature change and the bulge state of the core bag are monitored in real time through the temperature sensor and the pressure sensor, so that intervention delay can be avoided, and the working performance of the lithium battery is ensured.

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. So as to implement cooling intervention, pressure relief intervention and the like on the lithium battery according to the temperature monitoring condition and the pressure detection condition.

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 system, the actual temperature of the core pack exceeds the set temperature of the system, 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, 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 bag and a lithium battery, which can monitor the temperature change and the swelling state of the core bag in real time, avoid intervention delay and ensure the working performance of the lithium battery.

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

the utility model provides a core package, is in including core package body and parcel the protection film of core package body surface, the protection film has relative medial surface and lateral surface, the medial surface orientation the core package body, the lateral surface deviates from the core package body, be provided with temperature sensor on the medial surface, just temperature sensor with core package body butt, be provided with pressure sensor on the lateral surface, pressure sensor is used for monitoring the bulge state of core package body.

Further, at least one of the temperature sensor and the pressure sensor is bonded and fixed with the protective film.

Further, the temperature sensor comprises a temperature electrode plate and a first coating coated on the surface of the temperature electrode plate; and/or the number of the groups of groups,

the pressure sensor comprises a pressure electrode plate and a second coating coated on the surface of the pressure electrode plate.

Further, the thickness of the temperature electrode plate is 30-100 μm; the thickness of the pressure electrode plate is 30-100 μm.

Further, the core pack body is of a cuboid structure, the protective film comprises two first diaphragms, the two first diaphragms are respectively used for wrapping two sides of the core pack body with the largest area, and at least one of the first diaphragms is provided with the temperature sensor and the pressure sensor.

Further, a plurality of temperature monitoring components are arranged on the first diaphragm, the temperature monitoring components are distributed at intervals along the direction from the middle part to the periphery part of the first diaphragm, and each temperature monitoring component comprises at least one temperature sensor; and/or the number of the groups of groups,

the pressure monitoring device comprises a first diaphragm and a second diaphragm, wherein a plurality of pressure monitoring assemblies are arranged on the first diaphragm, the pressure monitoring assemblies are distributed at intervals along the direction from the middle part to the periphery of the first diaphragm, and each pressure monitoring assembly comprises at least one pressure sensor.

Further, one of the temperature monitoring assemblies is a first temperature monitoring assembly, the first temperature monitoring assembly is located in the middle of the first membrane, the rest of the temperature monitoring assemblies comprise a plurality of temperature sensors, and the temperature sensors in each temperature monitoring assembly are distributed at intervals along the circumferential direction of the first temperature monitoring assembly;

among the multiple pressure monitoring components, one of them pressure monitoring component is first pressure monitoring component, first pressure monitoring component is located the middle part of first diaphragm, remaining pressure monitoring component all includes a plurality of pressure sensor, and every a plurality of in the pressure monitoring component pressure sensor follows first pressure monitoring component's circumferencial direction interval distribution.

Further, the first membrane is provided with a plurality of temperature sensors, and the temperature sensors are distributed in a shape of a Chinese character 'hui', a Chinese character 'mi', a Chinese character 'kou' or a Chinese character 'cross'; and/or the number of the groups of groups,

the first diaphragm is provided with a plurality of pressure sensors, and a plurality of pressure sensors are distributed in a shape like a Chinese character 'Hui', a shape like a Chinese character 'mi', a shape like a Chinese character 'kou' or a shape like a Chinese character 'cross'.

The lithium battery comprises a shell and a core pack, wherein the shell is provided with a containing cavity, the core pack is arranged in the containing cavity, and a pressure sensor on the core pack can be abutted with the shell.

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: through set up temperature sensor on the medial surface of protection film, temperature sensor can the butt on the core package body for temperature value that temperature sensor detected matches with the actual temperature of core package body. When the temperature value detected by the temperature sensor reaches the set temperature of the system, the lithium battery can be subjected to corresponding cooling intervention, thermal runaway is avoided, and further the working performance of the lithium battery is ensured and the service life of the lithium battery is prolonged. Through set up pressure sensor on the lateral surface of protection film, when the core package body took place the bulge, pressure sensor can detect the extrusion force between core package body and the shell. And the pressure data detected by the pressure sensor is matched with the actual bulge state of the core pack body. When the pressure value detected by the pressure sensor reaches the set pressure of the system, the corresponding pressure relief intervention can be carried out on the lithium battery, so that explosion accidents are avoided. Simultaneously, set up pressure sensor in the one side that the protection film deviates from the core package body for pressure sensor keeps away from the core package body, and pressure sensor separates with the core package body, can reduce pressure sensor and receive the heat influence of core package body, and then avoids pressure sensor to become invalid because of receiving thermal deformation. Therefore, the temperature change and the bulge state of the core bag are monitored in real time through the temperature sensor and the pressure sensor, the intervention delay can be avoided, and the working performance of the lithium battery is ensured.

Drawings

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

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

Fig. 3 is an expanded view of a first view of a protective film according to a first embodiment of the utility model.

Fig. 4 is an expanded view of a second view of the protective film according to the first embodiment of the utility model.

Fig. 5 is a schematic diagram of a first membrane according to a second embodiment of the utility model.

Fig. 6 is a schematic diagram of a first membrane according to a third embodiment of the utility model.

Fig. 7 is a schematic diagram of a first membrane according to a fourth embodiment of the utility model.

Fig. 8 is a schematic diagram of a first membrane according to a fifth embodiment of the utility model.

In the figure:

1. a core pack; 11. a core pack body; 12. a protective film; 121. a first membrane; 122. a second membrane; 123. a third membrane; 124. an inner side surface; 125. an outer side surface; 13. a temperature sensor; 14. a pressure sensor; 2. a housing; 20. a receiving chamber; 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.

Example 1

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 housing 2, wherein the housing 2 is internally provided with a closed accommodating cavity 20, and the core pack 1 is accommodated in the accommodating cavity 20 of the housing 2. And the holding chamber 20 is filled with an electrolyte, which can infiltrate the core pack 1 and participate in the 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 opposite inner and outer sides 124, 125. Wherein the inner side 124 of the protective film 12 faces the core pack body 11, and the outer side 125 of the protective film 12 faces away from the core pack body 11, i.e. the outer side 125 faces the cavity wall of the accommodating cavity 20. The temperature sensor 13 is disposed on the inner side 124 of the protective film 12, one side of the temperature sensor 13 is adhered to the protective film 12, and one side of the temperature sensor 13 facing away from the protective film 12 is in contact with the core pack body 11. 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. The pressure sensor 14 is disposed on the outer side 125 of the protective film 12, one side of the pressure sensor 14 is adhered to the protective film 12, and one side of the pressure sensor 14 facing away from the protective film 12 can abut against the cavity wall of the accommodating cavity 20. When the pack body 11 bulges during operation, the pack body 11 pushes the pressure sensor 14 toward the wall of the accommodating chamber 20, 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 in operation of the lithium battery, electrochemical reaction occurs on the core pack body 11, and the core pack body 11 is a component that directly generates heat, which is also the highest temperature component. By providing the temperature sensor 13 on the inner side surface 124 of the protective film 12, the temperature sensor 13 can be abutted on the core pack body 11 so that the temperature value detected by the temperature sensor 13 matches the actual temperature of the core pack body 11. When the temperature value detected by the temperature sensor 13 reaches the set temperature of the system, the external cooling system can be utilized to perform corresponding cooling intervention on the lithium battery, so that thermal runaway is avoided, the working performance of the lithium battery is further ensured, and the service life of the lithium battery is prolonged. By providing the pressure sensor 14 on the outer side 125 of the protective film 12, the pressure sensor 14 can detect the pressing force between the core pack body 11 and the outer case 2 when the core pack body 11 is inflated. And the pressure data detected by the pressure sensor 14 matches the actual bulge state of the core pack body 11. When the pressure value detected by the pressure sensor 14 reaches the system set pressure, the external explosion-proof system can be utilized to perform corresponding pressure relief intervention on the lithium battery, so that explosion accidents are avoided. Meanwhile, the pressure sensor 14 is arranged on one side of the protective film 12, which is away from the core pack body 11, so that the pressure sensor 14 is away from the core pack body 11, and the pressure sensor 14 and the core pack body 11 are separated under the influence of the protective film 12 and the temperature sensor 13, so that the thermal influence of the pressure sensor 14 on the core pack body 11 can be reduced, the pressure sensor 14 is prevented from being invalid due to thermal deformation, and the service life of the pressure sensor is prolonged.

The temperature sensor 13 includes a temperature electrode sheet and a first coating layer coated on a surface of the temperature electrode sheet. 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 first coating layer plays a role in protecting the temperature electrode plate. The first coating should have good thermal conductivity so that heat on the core pack body 11 can be rapidly conducted to the temperature electrode pad. The material of the first coating can be polyvinyl iso Ding Tai amine or polyoxyethylene ether.

The pressure sensor 14 includes a pressure electrode pad and a second coating applied to a surface of the pressure electrode pad. The pressure measurement principle of the pressure sensor 14 is that the resistance of the pressure electrode plate changes due to the deformation of the pressure electrode plate, so that the pressure sensor 14 outputs a corresponding electric signal. The second coating layer has waterproof and breathable properties, and the material of the second coating layer can be selected from high polymer materials such as TPU (thermoplastic polyurethane elastomer rubber), PET (polyethylene terephthalate) and the like.

Alternatively, the thickness of the temperature electrode sheet is selected to be 30 μm to 100 μm. So that the temperature sensor 13 has certain flexibility, so that the temperature sensor 13 can adapt to the shape of the core pack body 11, and the temperature sensor 13 is attached to the core pack body 11. The thickness of the pressure electrode sheet is selected to be 30 μm to 100 μm. So that the pressure sensor 14 has a certain flexibility, so that the pressure sensor 14 can adapt to the shape of the core pack body 11 and the outer shell 2, so that the pressure sensor 14 can be fitted on the cavity wall of the accommodating cavity 20.

Alternatively, as shown with reference to fig. 3 and 4, 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 mounted on the second diaphragm 122 or the third diaphragm 123.

The number of the temperature sensors 13 may be one or more on the first membrane 121. When the number of the temperature sensors 13 is one, the temperature sensor 13 is disposed at a middle position of the first diaphragm 121. I.e. the temperature sensor 13 is located in the middle of the large face of the core pack body 11. When the number of the temperature sensors 13 is plural, the plural temperature sensors 13 are spaced apart on the first diaphragm 121. Correspondingly, the number of pressure sensors 14 may be one or more. When the number of the pressure sensors 14 is one, the pressure sensors 14 are disposed at the middle position of the first diaphragm 121. I.e. the pressure sensor 14 is located in the middle of the large face of the core pack body 11. The amount of deformation of the core pack body 11 at which the bulge occurs is maximized at the middle position of the large face so as to accurately monitor the bulge state of the core pack body 11. When the number of the pressure sensors 14 is plural, the plural pressure sensors 14 are spaced apart on the first diaphragm 121.

Optionally, referring to fig. 3, a plurality of temperature monitoring components are disposed on the first membrane 121, and the plurality of temperature monitoring components are distributed at intervals along a direction from a middle portion to a peripheral portion of the first membrane 121, and each temperature monitoring component includes at least one temperature sensor 13. In this embodiment, three temperature monitoring components are disposed on the first membrane 121, and the three temperature monitoring components are a first temperature monitoring component, a second temperature monitoring component and a third temperature monitoring component respectively. The first temperature monitoring assembly is located at a middle position of the first diaphragm 121, and the first temperature monitoring assembly includes a temperature sensor 13. The second temperature monitoring assembly is located between the first temperature monitoring assembly and the third temperature monitoring assembly, the second temperature monitoring assembly comprises eight temperature sensors 13, and the eight temperature sensors 13 in the second temperature monitoring assembly are distributed at intervals along the circumferential direction of the first temperature monitoring assembly. The third temperature monitoring assembly comprises ten temperature sensors 13, and the ten temperature sensors 13 in the third temperature monitoring assembly are distributed at intervals along the circumferential direction of the first temperature monitoring assembly. Of course, in other embodiments, the number of the temperature sensors 13 in each temperature monitoring assembly may be flexibly selected according to the size of the core pack body 11 and the temperature variation distribution, and the specific number of the temperature sensors 13 is not limited in this embodiment.

Optionally, referring to fig. 4, a plurality of pressure monitoring assemblies are disposed on the first diaphragm 121, and are distributed at intervals along a direction from a middle portion to a peripheral portion of the first diaphragm 121, and each pressure monitoring assembly includes at least one pressure sensor 14. In this embodiment, two pressure monitoring assemblies are disposed on the first membrane 121, and the two pressure monitoring assemblies are a first pressure monitoring assembly and a second pressure monitoring assembly respectively. The first pressure monitoring assembly is located in a central position of the first diaphragm 121 and includes a pressure sensor 14. The second pressure monitoring assembly includes four pressure sensors 14, the four pressure sensors 14 in the second pressure monitoring assembly being spaced apart along the circumference of the first pressure monitoring assembly. Of course, in other embodiments, the number of pressure sensors 14 in each pressure monitoring assembly may be flexibly selected according to the size of the core pack body 11 and the distribution of the bulge state, and the specific number of pressure sensors 14 is not limited in this embodiment.

It will be appreciated that the temperature at each location on the core pack body 11 will be different, and especially when a short circuit occurs between the positive and negative pole pieces, the temperature in the short circuit region will rise dramatically. Therefore, when the temperature sensor 13 is arranged, the temperature sensor 13 may be distributed over the entire surface of the first diaphragm 121 to expand the monitoring range of the core pack body 11. Thus, in an alternative embodiment, three temperature monitoring components, namely a first temperature monitoring component, a second temperature monitoring component and a third temperature monitoring component, are distributed on the first membrane 121. The first temperature monitoring component is located at the middle position of the first membrane 121 to monitor the temperature change condition of the middle position on the corresponding side surface of the core pack body 11; the third temperature monitoring component is located at a peripheral position of the first diaphragm 121 to monitor a temperature change condition of the peripheral position on the corresponding side surface of the core pack body 11. The second temperature monitoring assembly is located between the first temperature monitoring assembly and the third temperature monitoring assembly. The structure can ensure that the temperature sensor 13 is distributed on the first membrane 121 more uniformly, and the corresponding side surface of the core pack body 11 is monitored comprehensively. When the core pack body 11 bulges, under the action of the mechanical properties of the core pack body 11 and the shell 2, the area with the most obvious bulge is located at the middle positions of the core pack body 11 and the shell 2, namely, the middle position corresponding to the first membrane 121. Therefore, two pressure detecting members are provided on the first diaphragm 121, and are each disposed at a position near the middle of the first diaphragm 121. The structure can reduce the arrangement quantity of the pressure sensors 14 while meeting the real-time monitoring of the bulge state of the core pack body 11, and is beneficial to saving the cost.

Alternatively, as shown with reference to fig. 2, the temperature sensor 13 and the pressure sensor 14 are stacked in the thickness direction (Y direction in the drawing) of the core pack 1, and the protective film 12 is interposed between the temperature sensor 13 and the pressure sensor 14. This structure makes the pressure sensor 14 separate from the core pack body 11 through the temperature sensor 13 and the protective film 12 to increase the interval between the pressure sensor 14 and the core pack body 11, avoiding the pressure sensor 14 from being thermally affected by the core pack body 11.

The remarkable effect of this embodiment is: by providing the temperature sensor 13 on the inner side surface 124 of the protective film 12, the temperature sensor 13 can be abutted on the core pack body 11 so that the temperature value detected by the temperature sensor 13 matches the actual temperature of the core pack body 11. When the temperature value detected by the temperature sensor 13 reaches the set temperature of the system, the lithium battery can be subjected to corresponding cooling intervention, so that thermal runaway is avoided, the working performance of the lithium battery is further ensured, and the service life of the lithium battery is prolonged. By providing the pressure sensor 14 on the outer side 125 of the protective film 12, the pressure sensor 14 can detect the pressing force between the core pack body 11 and the outer case 2 when the core pack body 11 is inflated. And the pressure data detected by the pressure sensor 14 matches the actual bulge state of the core pack body 11. When the pressure value detected by the pressure sensor 14 reaches the system set pressure, the corresponding pressure relief intervention can be performed on the lithium battery, so that explosion accidents are avoided. Meanwhile, the pressure sensor 14 is arranged on one side of the protective film 12, which is away from the core pack body 11, so that the pressure sensor 14 is far away from the core pack body 11, and the pressure sensor 14 is separated from the core pack body 11, so that the thermal influence of the pressure sensor 14 on the core pack body 11 can be reduced, and further, the pressure sensor 14 is prevented from being invalid due to thermal deformation. Therefore, the temperature change and the bulge state of the core pack 1 are monitored in real time through the temperature sensor 13 and the pressure sensor 14, so that intervention delay can be avoided, and the working performance of the lithium battery is ensured.

Example two

As shown in fig. 5, the present embodiment provides a core pack 1, which has a similar structure to that of the first embodiment, and is different in that a plurality of temperature sensors 13 are disposed on a first membrane 121, and the plurality of temperature sensors 13 are distributed in a cross shape. It may also be understood that two temperature monitoring assemblies are disposed on the first membrane 121, each temperature monitoring assembly includes a plurality of temperature sensors 13, and the plurality of temperature sensors 13 in each temperature monitoring assembly are arranged at intervals along the linear direction. The two temperature monitoring components are mutually perpendicular, so that the two temperature monitoring components are arranged in a cross shape.

Correspondingly, the first diaphragm 121 is provided with a plurality of pressure sensors 14, and the plurality of pressure sensors 14 are distributed in a cross shape. The distribution of the pressure sensors 14 is the same as that of the temperature sensors 13, and will not be described here again.

Example III

As shown in fig. 6, the present embodiment provides a core pack 1, which has a similar structure to that of the first embodiment, and is different in that a plurality of temperature sensors 13 are disposed on a first membrane 121, and the plurality of temperature sensors 13 are distributed in a shape of a "mouth". It may also be understood that a temperature monitoring assembly is disposed on the first membrane 121, each temperature monitoring assembly includes a plurality of temperature sensors 13, and the plurality of temperature sensors 13 are arranged in a rectangular ring shape, so that the temperature monitoring assembly is shaped like a "mouth".

Correspondingly, the first diaphragm 121 is provided with a plurality of pressure sensors 14, and the plurality of pressure sensors 14 are distributed in a shape of a Chinese character 'kou'. The distribution of the pressure sensors 14 is the same as that of the temperature sensors 13, and will not be described here again.

Example IV

As shown in fig. 7, the present embodiment provides a core pack 1, which has a similar structure to that of the first embodiment, and is different in that a plurality of temperature sensors 13 are disposed on a first membrane 121, and the plurality of temperature sensors 13 are distributed in a shape of a Chinese character 'hui'. It may also be understood that two temperature monitoring components are disposed on the first membrane 121, each temperature monitoring component includes a plurality of temperature sensors 13, and the plurality of temperature sensors 13 in each temperature monitoring component are arranged in a rectangular ring shape, and the two temperature monitoring components are distributed along the direction from the middle to the periphery of the first membrane 121 at intervals, so that the two temperature monitoring components are arranged in a shape of a Chinese character 'hui'.

Correspondingly, the first diaphragm 121 is provided with a plurality of pressure sensors 14, and the plurality of pressure sensors 14 are distributed in a shape like a Chinese character 'hui'. The distribution of the pressure sensors 14 is the same as that of the temperature sensors 13, and will not be described here again.

Example five

As shown in fig. 8, the present embodiment provides a core pack 1, which has a similar structure to that of the first embodiment, and is different in that a plurality of temperature sensors 13 are disposed on a first membrane 121, and the plurality of temperature sensors 13 are distributed in a shape of a "meter". It may also be understood that four temperature monitoring assemblies are disposed on the first membrane 121, each temperature monitoring assembly includes a plurality of temperature sensors 13, and the plurality of temperature sensors 13 in each temperature monitoring assembly are arranged at intervals along the linear direction. The four temperature monitoring components are arranged at an included angle, the middle parts of any two temperature monitoring components are intersected, and the included angles between two adjacent temperature monitoring components are the same.

Correspondingly, the first diaphragm 121 is provided with a plurality of pressure sensors 14, and the plurality of pressure sensors 14 are distributed in a shape of a Chinese character 'mi'. The distribution of the pressure sensors 14 is the same as that of the temperature sensors 13, and will not be described here again.

Example six

As shown in fig. 1 and 2, the present utility model provides a lithium battery including a case 2 and a core pack 1. 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 a containing cavity 20, the core pack 1 is contained in the containing cavity 20, and the pressure sensor 14 in the core pack 1 can be abutted with the cavity wall of the containing cavity 20. The accommodating cavity 20 is also filled with electrolyte, and the electrolyte is used for infiltrating the core pack body 11 in the core pack 1. In the operation 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 accommodating cavity 20 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. When the core pack 1 is overtemperature or superpressure, the monitoring data acquired according to the temperature sensor 13 and the pressure sensor 14 can respectively implement cooling intervention or pressure relief intervention on the lithium battery through an external cooling system and a pressure relief system, so that thermal runaway accidents and explosion accidents of the lithium battery are avoided. Thereby being beneficial to ensuring the working performance of the lithium battery and prolonging the service life of the lithium battery.

The case 2 includes a lower case 21 and a top cap assembly 22 mounted on top of the lower case 21, the top cap assembly 22 including a cap plate 221 and a pole 222. The cover 221 is disposed on top of the lower case 21 such that the accommodating chamber 20 is formed 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. The shell 2 has more reasonable internal space of the accommodating cavity 20 under the aspect ratio, which is beneficial to improving the utilization rate of the active substances in the shell, further achieving the purpose of prolonging the service cycle of the lithium battery and meeting the requirements of users on over-endurance and over-capacity.

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

1. The utility model provides a core package, its characterized in that includes core package body and parcel are in the protection film of core package body surface, the protection film has relative medial surface and lateral surface, the medial surface orientation the core package body, the lateral surface deviates from the core package body, be provided with temperature sensor on the medial surface, just temperature sensor with core package body butt, be provided with pressure sensor on the lateral surface, pressure sensor is used for monitoring the bulge state of core package body.

2. The core pack of claim 1, wherein at least one of the temperature sensor and the pressure sensor is adhesively secured to the protective film.

3. The core pack of claim 1, wherein the temperature sensor comprises a temperature electrode sheet and a first coating applied to a surface of the temperature electrode sheet; and/or the number of the groups of groups,

4. The core pack according to claim 3, wherein the thickness of the temperature electrode sheet is 30 μm-100 μm; the thickness of the pressure electrode plate is 30-100 μm.

5. The core pack according to any one of claims 1 to 4, 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 largest-area sides of the core pack body, and the temperature sensor and the pressure sensor are provided on at least one of the first diaphragms.

6. The core pack of claim 5, wherein a plurality of temperature monitoring assemblies are disposed on the first membrane, the plurality of temperature monitoring assemblies being spaced apart along a direction from a middle portion to a peripheral portion of the first membrane, each of the temperature monitoring assemblies including at least one of the temperature sensors; and/or the number of the groups of groups,

7. The core pack of claim 6, wherein one of the temperature monitoring assemblies is a first temperature monitoring assembly, the first temperature monitoring assembly is located in the middle of the first diaphragm, the remaining temperature monitoring assemblies each include a plurality of the temperature sensors, and the plurality of the temperature sensors in each of the temperature monitoring assemblies are distributed at intervals along the circumferential direction of the first temperature monitoring assembly;

8. The core pack according to claim 5, wherein a plurality of the temperature sensors are arranged on the first membrane, and the plurality of the temperature sensors are distributed in a shape of a Chinese character 'hui', a Chinese character 'mi', a Chinese character 'kou' or a Chinese character 'cross'; and/or the number of the groups of groups,

9. A lithium battery comprising a housing and a core pack according to any one of claims 1 to 8, the housing having a receiving cavity in which the core pack is disposed, a pressure sensor on the core pack being capable of abutting the housing.

10. The lithium battery of claim 9, 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.