CN216958243U - Battery and battery module - Google Patents

Abstract

The application provides a battery and a battery module. The battery comprises a battery core, an outer package and a pressure relief air bag. The battery cell is arranged in the outer package. The pressure relief air bag is communicated with the inner space of the outer package. The pressure relief air bag and the outer package form a sealed space together. The battery and the battery module of this application can increase the inside volume of battery through setting up the pressure release air pocket to solve because of the limited problem that leads to producing the weeping or exploding of battery extranal packing volume.

Description

Battery and battery module

Technical Field

The application relates to the technical field of batteries, in particular to a battery and a battery module.

Background

In recent years, new energy automobiles are becoming the mainstream of the development of the automobile industry. The pure electric vehicle with the power battery meets a good development environment. However, with the large number of applications of batteries, the corresponding safety problems are gradually revealed. Batteries continue to improve in the selection and development of the market. The problem of the use safety of the battery is one of the most concerned problems, and is also the key point which is most important and urgently to be solved in the new energy industry.

The SEI film (solid electrolyte interface film) is decomposed and broken due to overcharge and overdischarge of the battery, internal micro-short circuit, and the like. Also, a high content of moisture in the electrolyte solution causes an electrolytic reaction. This is a series of reasons that can cause the cell to generate gases during recycling or storage. When the gas production reaches a preset value, the internal pressure of the battery is increased, so that the battery has serious problems of swelling, liquid leakage, even explosion and the like, and certain potential safety hazards exist.

At present, the method for solving the problem of swelling generated inside the battery generally starts with the materials of the anode and cathode materials and the electrolyte of the battery, changes the compositions of the anode and cathode materials and the components of the electrolyte, and reduces the gas production to a certain extent. However, when the gas production rate inside the battery is large, the external package of the battery still reaches the maximum pressure value that the external package can bear, and the problems of swelling, liquid leakage and even explosion are generated.

SUMMERY OF THE UTILITY MODEL

The application provides a battery and battery module can increase the inside volume of battery through setting up pressure release air pocket to solve because of the limited problem that leads to producing the weeping or exploding of battery extranal packing volume.

In one aspect, the present application provides a battery comprising:

an electric core;

the battery cell is arranged in the outer package;

and the pressure relief air bag is communicated with the inner space of the outer package, and the pressure relief air bag and the outer package form a sealed space together.

The battery provided by the application can generate gas inside the battery in the recycling or storage process. Because the pressure release air pocket is linked together with the inner space of extranal packing, consequently the gas in the extranal packing also can get into the pressure release air pocket to reduce the gas pressure in the extranal packing, thereby improve the gas pressure value that the battery inside can bear, reduce the battery and take place the risk of swell, weeping or even explosion, improve the safety in utilization of battery.

According to one embodiment of the application, the pressure relief airbag and the outer package are of an integral structure.

According to an embodiment of the present application, the height of the pressure relief air bag is smaller than the height of the outer package in the height direction of the outer package.

According to one embodiment of the application, the pressure relief airbag is rectangular, and the top edge of the pressure relief airbag is flush with the top edge of the outer package in the height direction.

According to one embodiment of the present application, the pressure relief bag is provided outside the outer package in the width direction of the outer package.

On the other hand, the present application provides a battery module, it includes:

a partition plate;

as in the battery of the above embodiment, the separators are arranged alternately with the battery in the thickness direction of the battery;

the puncture needle is arranged on the partition board and corresponds to the pressure relief air bag along the thickness direction.

According to the battery module provided by the embodiment of the application, the battery can generate gas in the recycling or storage process. When the gas amount in the battery exceeds the gas amount which can be born by the outer package, the gas can enter the pressure relief gas bag. The volume of the pressure relief air bag is increased along with the increase of the gas quantity in the battery, so that the pressure relief air bag is expanded. When the gas amount in the battery reaches a preset value, the inflated pressure relief air bag can be in contact with the correspondingly arranged puncture needle. The sharp part of the puncture needle can be inserted into the pressure relief air bag to form an opening on the pressure relief air bag, so that the gas in the battery is released, and the risk of bulging, gas leakage and even explosion of the battery caused by the fact that the gas in the battery cannot be released after the gas quantity in the battery is increased is avoided.

According to one embodiment of the application, the battery module further comprises an elastic member, the elastic member is arranged on the partition plate, and the puncture needle is positioned inside the elastic member.

According to one embodiment of the present application, the lancet has a venting channel.

According to one embodiment of the application, the puncture needle is of a hollow structure, and the central hole of the puncture needle forms an air exhaust channel; alternatively, the outer peripheral surface of the spike has a recess that forms the air venting channel.

According to one embodiment of the application, the battery module further comprises a locking piece, and the locking piece is connected with the puncture needle and the separator.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application.

Fig. 1 is a schematic structural diagram of a battery according to an embodiment of the present application;

FIG. 2 is a schematic sectional view taken along A-A in FIG. 1;

fig. 3 is a schematic structural diagram of a battery module according to an embodiment of the present application;

fig. 4 is a schematic diagram illustrating a partially exploded structure of a battery module according to an embodiment of the present disclosure;

FIG. 5 is a schematic cross-sectional view taken along line B-B of FIG. 3;

FIG. 6 is an enlarged schematic view at C of FIG. 5;

fig. 7 is a partial sectional view illustrating a battery module according to another embodiment of the present disclosure.

Description of reference numerals:

100. a battery;

110. an electric core; 111. a tab;

120. packaging the materials;

130. a pressure relief air bag;

200. a battery module;

210. a partition plate;

220. a needle; 220a, an exhaust passage;

221. a tip portion; 222. a recess; 223. a threaded portion;

230. a module housing;

240. an elastic member; 240a, avoiding holes;

250. a locking member;

x, height direction;

y, width direction;

z, thickness direction.

With the above figures, there are shown specific embodiments of the present application, which will be described in more detail below. These drawings and written description are not intended to limit the scope of the inventive concepts in any manner, but rather to illustrate the inventive concepts to those skilled in the art by reference to specific embodiments.

Detailed Description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.

The battery 100 of the embodiment of the present application may include a lithium ion secondary battery, a lithium sulfur battery, a sodium lithium ion battery, or the like. And is not limited in this application. The battery 100 is generally divided into a prismatic battery and a pouch battery in a packaging manner. Nor is it limited in this application.

The device of the embodiment of the application can be mobile devices such as vehicles, ships and small airplanes. Taking a vehicle as an example, the vehicle of the present application may be a new energy automobile. The new energy automobile can be a pure electric automobile, and also can be a hybrid electric automobile or a range-extended automobile. The vehicle interior may be provided with a battery pack. The battery pack includes at least one battery module 200. The battery pack can be used as a driving power supply of an automobile to provide driving power for the automobile instead of or partially replacing fuel oil or natural gas. Illustratively, the battery pack supplies electric power to the driving motor. The driving motor is connected with wheels on the vehicle through a transmission mechanism so as to drive the vehicle to move. Specifically, the battery pack may be horizontally disposed at the bottom of the vehicle.

In some realizable manners, battery 100 includes a cell 110 and an overwrap 120. The battery cells 110 are disposed in the outer package 120. The battery cell 110 includes a positive plate, a separator, and a negative plate. The positive electrode sheet, the separator, and the negative electrode sheet may be formed into the battery cell 110 by a winding process. The battery cell 110 includes two tabs 111 with opposite polarities. The two tabs 111 may respectively protrude from the interior of the outer package 120 to be exposed to the outside of the outer package 120. The outer package 120 is used to protect the battery cell 110, so as to reduce the possibility of damage to the battery cell 110 caused by collision of an external object, and improve the service life of the battery 100. The exterior package 120 may form an inner space for containing an electrolyte.

The decomposition damage of the SEI film may be caused by overcharge and overdischarge of the battery 100, internal micro short circuit, and the like. Also, a high content of moisture in the electrolyte solution causes an electrolytic reaction. This is a number of reasons that can cause the cell 100 to generate gases during recycling or storage. The generation of gas causes an increase in the internal pressure of the battery 100. When the gas production reaches a predetermined value, battery 100 may cause serious problems such as swelling, liquid leakage, and even explosion.

At present, the method for solving the problem of swelling generated inside the battery 100 generally starts with the materials of the anode and cathode materials and the electrolyte of the battery 100, and changes the compositions of the anode and cathode materials and the components of the electrolyte, thereby reducing the gas production to a certain extent. However, when the gas production rate inside the battery 100 is large, the outer package 120 of the battery 100 still reaches the maximum pressure value that it can withstand, and problems such as swelling, liquid leakage, and even explosion occur.

Based on the above problems discovered by the applicant. The applicant improves the structure of the battery 100, and the following further describes the embodiments of the present application.

Referring to fig. 1 and 2, a battery 100 according to an embodiment of the present disclosure includes a battery cell 110, an exterior package 120, and a pressure relief gas bag 130. The battery cells 110 are disposed in the outer package 120. The decompression bag 130 communicates with the inner space of the outer package 120. The pressure relief air bag 130 forms a sealed space together with the outer package 120.

In the battery 100 according to the embodiment of the present invention, gas may be generated inside the battery 100 during the recycling or storage process. The generated gas expands the outer package 120. Because the pressure relief air bag 130 is communicated with the inner space of the outer package 120, the gas in the outer package 120 can also enter the pressure relief air bag 130 to reduce the gas pressure in the outer package 120, thereby improving the gas pressure which can be borne by the inner part of the battery 100, reducing the risk of swelling, liquid leakage and even explosion of the battery 100, and improving the use safety of the battery 100.

In some realizable ways, the overwrap 120 may be an aluminum plastic film. The aluminum-plastic film has good stamping formability and puncture resistance. Meanwhile, the aluminum plastic film can generate elastic deformation. During use of the battery 100, gas is generated inside the battery. The outer package 120 of the aluminum-plastic film can generate certain elastic deformation along with the increase of the gas volume inside the battery 100, so that the gas pressure value which can be borne inside the battery 100 is improved, the risk of explosion caused by the expansion of the outer package 120 of the battery 100 is reduced, and the use safety of the battery 100 is improved. In addition, when the outer package 120 of the battery 100 is inflated to cause explosion, the aluminum plastic film with elastic deformation can reduce the release force of high-pressure gas inside the battery 100, thereby being beneficial to reducing the acting force when the battery 100 explodes and reducing personal injury and property loss caused by explosion.

In some realizable manners, referring to fig. 2, the pressure relief air bag 130 and the outer package 120 are integrated, so that the overall sealing performance of the pressure relief air bag 130 and the outer package 120 can be improved, and the problem that the electrolyte leaks and the performance of the battery 100 is affected due to poor sealing performance after the pressure relief air bag 130 and the outer package 120 are assembled is avoided. Meanwhile, the pressure relief airbag 130 and the outer package 120 of the integrated structure are assembled into a whole without being separately processed, so that the processing and assembling time of the battery 100 can be saved, the processing efficiency of the battery 100 can be improved, and the processing cost of the battery 100 can be saved.

In some examples, pressure relief pocket 130 may be machined during the packaging process of battery 100. The pressure relief airbag 130 and the outer package 120 are integrated into a single structure after the package is completed. Taking the package 120 made of plastic-aluminum film as an example, the packaging process of the battery 100 is as follows:

aluminum-plastic molding: the shape and size of the molding die are designed according to the size of the battery cell 110. Then, under the condition of heating, a concave pit matched with the battery cell 110 is punched on the aluminum plastic film by using a forming die, and then cutting forming is carried out. The recess is used for accommodating the battery cell 110.

A first packaging process, namely a first packaging process: comprises a top seal and a side seal. First, the winding type or laminated type battery cell 110 is placed in the pit. Then, the aluminum plastic film is folded in half to completely package the battery cell 110. And then, performing top sealing and side sealing on the battery cell 110 by using a top-side sealing machine. The top seal is to seal the end close to the tab 111. The side sealing is to seal any one of the two sides which are not sealed. After the top side sealing of the battery cell 110 is completed, the aluminum-plastic film is left with an opening at one side to perform an electrolyte injection process on the battery 100.

Standing and forming: after the first sealing process and the liquid injection are completed, the battery cell 110 needs to be stood to allow the electrolyte to fully infiltrate the pole piece. Then, the battery 100 is formed. In the formation process of the battery cell 110, the electrolyte reacts with the negative active layer at a solid-liquid interface to form an SEI film covering the surface of the negative active layer. The SEI film has a protective effect on the negative active layer, and can increase the cycle life of the negative active layer.

A second packaging process, namely a second packaging process: and packaging one side of the liquid injection port. Firstly, the interior of the aluminum plastic film is vacuumized from the opening end. Then, the open end is immediately packaged to ensure the air tightness of the aluminum plastic film.

A cutting procedure: after the second sealing process is completed, the aluminum-plastic film needs to be trimmed. The edges of the first seal and the edges of the second seal are cut to a suitable width to ensure that the width of the battery 100 meets the product requirements.

In some realizable manners, as shown in fig. 1, along the height direction X of the outer package 120, the height a of the pressure relief gas bag 130 is smaller than the height b of the outer package 120.

If the size of the pressure relief airbag 130 is increased, the amount of gas that can be contained in the pressure relief airbag 130 may be increased. However, since the outer package 120 communicates with the inner space of the pressure relief bag 130, if the volume of the pressure relief bag 130 is too large, the battery cell 110 may be shaken in the sealed space formed by the pressure relief bag 130 and the outer package 120. The battery cell 110 that shakes will drive the tab 111 to move, thereby affecting the sealing between the tab 111 and the outer package 120, causing problems such as electrolyte leakage, and finally affecting the usability and safety of the battery 100. Therefore, the height of the pressure relief air bag 130 is smaller than that of the outer package 120, so that the battery cell 110 can be effectively prevented from shaking in a sealed space, and the problem that the battery 100 has poor electrolyte leakage due to poor sealing performance between the tab 111 and the outer package 120 is avoided.

In some realizable ways, referring to fig. 1, the pressure relief airbag 130 of the present embodiment is rectangular. The top edge of the pressure relief airbag 130 is flush with the top edge of the outer package 120 in the height direction X. Note that the top edge of the pressure relief airbag 130 and the top edge of the outer package 120 are close to the tab 111 of the battery 100.

In some examples, the shape of the pressure relief airbag 130 may be set according to the shape of a cap of a top-side sealer during the packaging of the battery 100. The shape of the pressure relief airbag 130 may be completed in a single sealing process or a double sealing process, so that the outer package 120 and the pressure relief airbag 130 are an integral structure after the battery 100 is completely packaged.

Illustratively, the rectangular pressure relief airbag 130 may be formed in a single sealing process. When the outer package 120 is cut after punching, a Z-shaped cutting mode is adopted. First, a side air pocket is reserved on one side in the height direction X of the battery 100. After top sealing, the side sealing is also carried out by adopting a Z-shaped sealing head, so that a rectangular pressure relief air bag 130 is formed at the side.

Alternatively, the rectangular pressure relief air bag 130 may be formed in a two-sealing process. After the outer package 120 is cut by punching, in the second sealing process, a small air bag is reserved on one side of the liquid injection port by adopting a Z-shaped sealing head, and the small air bag is packaged, so that a rectangular pressure relief air bag 130 is formed on the side of the liquid injection port.

In some examples, referring to fig. 3, a plurality of batteries 100 may be arranged side by side in the thickness direction Z to form a battery module 200. The plurality of batteries 100 may be connected in series or in parallel. One end of the battery 100 having the tab 111 is disposed upward. The pressure relief airbag 130 is located at one side of the outer package 120 close to the tab 111, so that the expansion degree of the pressure relief airbag 130 can be observed when the battery module 200 is opened, thereby facilitating the convenient and fast detection of the abnormal condition of the battery 100 in the battery module 200, improving the detection efficiency of the battery module 200, and reducing the maintenance cost of the battery module 200.

In some realizable manners, referring to fig. 2 and 3, the pressure relief air bag 130 is disposed outside the outer package 120 in the width direction Y of the outer package 120.

Since the plurality of batteries 100 may be arranged side by side in the thickness direction Z to form the battery module 200, if the pressure relief airbag 130 is disposed at an outer side in the thickness direction Z, it occupies a space in the thickness direction Z, thereby reducing the energy density of the battery 100. If the position of the pressure relief bag 130 is disposed outside in the height direction X, the space in the height direction X is occupied, and the energy density of the battery 100 is reduced. Therefore, the pressure relief bag 130 is disposed outside the outer package 120 in the width direction Y, so that the internal space of the battery module 200 can be saved, which is advantageous for increasing the energy density of the battery module 200. Illustratively, under normal use conditions of the battery, the overall thickness of the pressure relief gas bag 130 is smaller than that of the battery cell 110.

The embodiment of the present application further provides a battery module 200. Referring to fig. 3 and 4, a battery module 200 according to an embodiment of the present application includes a separator 210, batteries 100, and lancet 220. The separators 210 are alternately arranged with the battery 100 in the thickness direction Z of the battery 100. The lancet 220 is disposed on the partition 210. The puncture needle 220 corresponds to the position of the pressure relief air bag 130 in the thickness direction Z.

In some examples, the lancet 220 includes a tip 221. The tip 221 of the needle 220 may correspond to the central region of the pressure relief airbag 130, so that after the pressure relief airbag 130 collects and expands the gas, the tip 221 of the needle 220 may penetrate into the central region of the pressure relief airbag 130, which is beneficial to increase the speed of releasing the high-pressure gas in the pressure relief airbag 130. In addition, when the pressure relief airbag 130 collects and expands gas, the central area of the pressure relief airbag 130 is protruded more than the edge area, so that the puncture needle 220 is disposed corresponding to the central area of the pressure relief airbag 130, and the pressure relief airbag 130 can be ensured to be punctured by the puncture needle 220 in time to release gas, so that the pressure relief airbag 130 is not easy to exceed its maximum pressure-bearing value to explode.

The battery 100 may generate gas during recycling or storage. The gas inside battery 100 enters pressure relief gas bag 130 through outer package 120. The volume of the pressure relief air bag 130 is increased as the amount of gas inside the battery 100 is increased. When the amount of gas inside the battery 100 reaches a predetermined value, the inflated pressure relief airbag 130 may contact with the corresponding spike 220. The tip 221 of the puncture needle 220 can be inserted into and pierce the pressure relief air bag 130, so that an opening is formed on the pressure relief air bag 130, thereby releasing the gas inside the battery 100, avoiding the risk that the battery 100 is exploded due to the fact that the gas inside the battery 100 cannot be released after being increased, and being beneficial to improving the use safety of the battery module 200.

In some examples, the battery module 200 includes a plurality of batteries 100 connected in series or in parallel. One separator 210 is provided for each battery 100. The separator 210 has a plate-like structure. The separators 210 are alternately disposed with the batteries 100 inside the module case 230 in the thickness direction Z of the batteries 100. The thickness direction Z of the separator 210 is the same as the thickness direction Z of the battery 100, so that the battery 100 and the separator 210 have the largest contact area, and thus the arrangement between the battery 100 and the separator 210 is compact, which is beneficial to saving the internal space of the battery module 200 and improving the energy density of the battery module 200.

In some examples, the material of the spacer 210 may be an insulating material. The separator 210 has an area larger than that of the battery 100 to maintain insulation between the plurality of batteries 100 after installation. Meanwhile, the area of the separator 210 beyond the battery 100 can be provided with the puncture needle 220, so that the possibility that the installation operation difficulty of the puncture needle 220 is large because the puncture needle 220 needs to avoid the outer package 120 is reduced, and the improvement of the installation efficiency of the battery module 200 is facilitated.

In some realizable manners, as shown in fig. 4 and 5, the battery module 200 further includes an elastic member 240. When the elastic member 240 is pressed by a force in the thickness direction Z, the elastic member 240 itself is compressed and deformed. The elastic member 240 is disposed on the partition 210. The lancet 220 is located inside the elastic member 240. Illustratively, the lancet 220 is disposed entirely within the elastic member 240 and is not visible from the exterior.

In some examples, the pressure relief airbag 130 may contact the elastic member 240 after being inflated, and gradually press the elastic member 240. When the elastic member 240 is compressed to a predetermined degree, the tip 221 of the lancet needle 220 is exposed from the elastic member 240. The pressure relief airbag 130 continues to inflate until it is punctured by the spike 220. The elastic member 240 can play a role in buffering, so as to prevent the puncture needle 220 from not contacting the pressure relief airbag 130 due to the too high expansion speed of the pressure relief airbag 130, thereby preventing the pressure relief airbag 130 from exploding in advance to cause the failure of the pressure relief airbag 130 and cause safety problems.

In some examples, the material of the elastic member 240 may be foam or sponge. The elastic member 240 has advantages of good elasticity, light weight, and the like.

In some examples, the elastic member 240 may be a cube. The length of the lancet 220 protruding the partition 210 in the thickness direction Z is less than the thickness of the elastic member 240, so that the lancet 220 is completely hidden inside the elastic member 240.

In some examples, the elastic member 240 is provided with an escape hole 240 a. The lancet 220 is located within the relief hole 240 a. The diameter of the relief hole 240a may be larger than the maximum diameter of the puncture needle 220, so that when the elastic member 240 is squeezed after the pressure relief air bag 130 is expanded, the puncture needle 220 can smoothly extend out of the relief hole 240a and puncture the pressure relief air bag 130, which is beneficial to reducing the resistance borne by the puncture needle 220 in the process of exposing from the elastic member 240.

In some implementations, the resilient member 240 is bonded to the spacer 210. Illustratively, the elastic member 240 may be bonded to the spacer 210 using an insulating double-sided tape. The adhesive fixing method is simple to operate, has good connection reliability for the elastic member 240 with light weight, and is low in cost.

In some implementations, as shown in FIGS. 5 and 6, the lancet 220 has a vent channel 220 a. The pressure relief airbag 130 is inflated to be pierced by the piercing needle 220, so as to release the gas in the pressure relief airbag 130. However, while the puncture needle 220 is puncturing the inside of the pressure relief air bag 130, the tip 221 of the puncture needle 220 may block the hole formed by the puncture on the pressure relief air bag 130, thereby affecting the exhaust speed of the pressure relief air bag 130. Therefore, the exhaust channel 220a disposed on the puncture needle 220 can release the gas in the pressure relief air bag 130 through the exhaust channel 220a, so as to increase the release speed of the gas in the pressure relief air bag 130, and avoid the failure of the pressure relief air bag 130 due to the untimely release of the gas by the pressure relief air bag 130, which finally leads to the explosion of the battery 100.

In some implementations, the lancet 220 is a hollow structure. In some examples, the lancet 220 has a central aperture. The central bore of the spike 220 forms an air venting channel 220 a. Illustratively, referring to FIG. 6, the cross-sectional shape of the central aperture may be circular.

In some realizable forms, the outer peripheral surface of the lancet needle 220 has a recess 222. The recess 222 forms an exhaust passage 220 a. Illustratively, referring to FIG. 7, the outer peripheral surface of the lancet needle 220 is provided with at least one recess 222. The gas in the pressure relief bag 130 can be released through the concave portion 222.

In some realizable manners, as shown in fig. 7, the battery module 200 further includes a locking member 250. The locking member 250 connects the lancet 220 with the spacer 210.

In some examples, one end of the lancet needle 220 is provided with a pointed portion 221 and the other end is provided with a threaded portion 223. The tip 221 of the puncture needle 220 corresponds to the pressure relief air bag 130. The partition 210 is provided with a screw hole. The threaded portion 223 of the spike 220 mates with the threaded hole and is attached to the fastener 250 on the side of the partition 210 facing away from the pressure relief airbag 130. Illustratively, the locking member 250 may be a nut.

In other examples, the lancet needle 220 is provided with a tip portion 221 at one end and a threaded portion 223 at the other end. The tip 221 of the puncture needle 220 corresponds to the pressure relief air bag 130. The partition 210 is provided with a screw hole. The threaded portion 223 of the lancet 220 mates with a threaded hole in the spacer 210 to secure the lancet 220 to the spacer 210.

In the description of the embodiments of the present application, it should be noted that unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, a fixed connection, an indirect connection via an intermediary, a connection between two elements, or an interaction between two elements. The specific meanings of the above terms in the embodiments of the present application can be understood by those of ordinary skill in the art according to specific situations.

Reference throughout this specification to apparatus or components, in embodiments or applications, means or components must be constructed and operated in a particular orientation and therefore should not be construed as limiting the present embodiments. In the description of the embodiments of the present application, "a plurality" means two or more unless specifically stated otherwise.

The terms "first," "second," "third," "fourth," and the like in the description and in the claims of the embodiments of the application and in the drawings described above, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein.

Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

The term "plurality" herein means two or more. The term "and/or" herein is merely an association describing an associated object, meaning that three relationships may exist, e.g., a and/or B, may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship; in the formula, the character "/" indicates that the preceding and following related objects are in a relationship of "division".

It is to be understood that the various numerical references referred to in the embodiments of the present application are merely for descriptive convenience and are not intended to limit the scope of the embodiments of the present application.

It should be understood that, in the embodiment of the present application, the sequence numbers of the above-mentioned processes do not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiment of the present application.

Claims (10)

1. A battery, comprising:

an electric core;

an outer package, the cell disposed within the outer package;

and the pressure relief air bag is communicated with the inner space of the outer package, and the pressure relief air bag and the outer package form a sealed space together.

2. The cell defined in claim 1, wherein the pressure relief airbag is of unitary construction with the outer package.

3. The battery according to claim 1 or 2, wherein the height of the pressure relief gas bag is smaller than the height of the exterior package in the height direction of the exterior package.

4. The battery of claim 3, wherein the pressure relief air bag is rectangular, and a top edge of the pressure relief air bag is flush with a top edge of the exterior package in the height direction.

5. The battery according to claim 1, wherein the pressure relief gas bag is provided outside the exterior package in a width direction of the exterior package.

6. A battery module, comprising:

a partition plate;

the battery according to any one of claims 1 to 5, wherein the separators are arranged alternately with the battery in a thickness direction of the battery;

and the puncture needle is arranged on the partition plate, and corresponds to the pressure relief air bag along the thickness direction.

7. The battery module as set forth in claim 6, further comprising an elastic member disposed on the separator, the puncture needle being located inside the elastic member.

8. The battery module according to claim 6, wherein the lancet has a vent channel.

9. The battery module according to claim 8, wherein the lancet is of a hollow structure, and a central hole of the lancet forms the air exhaust channel; alternatively, the outer peripheral surface of the lancet has a recess that forms the air discharge channel.

10. The battery module as set forth in claim 6, further comprising a locking member connecting the lancet and the separator.

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