Battery shell assembly, lithium battery and battery pack

Abstract

The utility model relates to a battery shell assembly, a lithium battery and a battery pack, in the battery shell assembly, a partition plate is arranged in a shell to divide an accommodating cavity into a first accommodating sub-cavity and a second accommodating sub-cavity; a battery cell main body is arranged in the first accommodating sub-cavity, and a fire-fighting agent is stored in the second accommodating sub-cavity; mounting holes are formed in the partition plates; the battery cell main body comprises an electrode connecting piece; the valve body is arranged in the mounting hole; the valve body is opened when the battery cell main body is subjected to thermal runaway so as to spray a fire extinguishing agent to the battery cell main body; the first end of the cutting part is arranged in the second accommodating sub-cavity; when the valve body is opened, the second end of the cut-off piece extends out of the valve body to cut off the electrode connecting piece, so that when the battery cell main body is subjected to thermal runaway, fire-fighting measures with quick isolation, quick response, accurate control and small influence range are carried out on the single battery cell subjected to thermal runaway; thermal runaway diffusion of the whole battery pack caused by thermal runaway of the single battery cells and damage to other electrical parts caused by failure of the single battery cells are avoided.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery housing assembly, a lithium battery and a battery pack. Background Art

[0002] With the development of battery technology, the application fields of batteries are becoming more and more extensive. Batteries can be divided into lead-acid batteries and lithium batteries according to materials. Lithium batteries have advantages such as high energy density and many cycles, but the dangers of lithium batteries are also prominent. When lithium batteries have phenomena such as battery heating, bulging, smoke, and open flames, it is easy to cause the internal reaction of the battery to get out of control. The battery module of the lithium battery system is designed to connect multiple battery packs in series, which increases the safety risks of lithium batteries. When a battery performance is unstable and a fire occurs, it will affect the safety of surrounding lithium batteries and further expand the scope of the fire.

[0003] At present, the existing fire protection measures for lithium batteries are usually aimed at the entire lithium battery system. When the gas changes in the battery pack are detected and an alarm is sounded, the electrical equipment is disconnected from the power supply, the alarm information is uploaded to the background monitoring, and then the fire extinguishing device is activated to extinguish the fire in the entire battery pack. When any single cell triggers an alarm, the fire protection system will carry out fire protection treatment on the entire battery pack. It is impossible to accurately carry out fire protection treatment on the target cell, and the fire extinguishing range is wide, which is easy to cause fire extinguishing delays. As time goes by, the losses caused will become greater and greater. Utility Model Content

[0004] Based on this, it is necessary to provide a fire-fighting measure with a smaller impact range that can quickly isolate, quickly respond, and accurately control the single cell experiencing thermal runaway when thermal runaway occurs inside the single cell, in order to address the problems existing in the above-mentioned existing lithium batteries, so as to avoid the spread of thermal runaway of the entire battery pack due to thermal runaway of the single cell, and to avoid damage to other electrical components due to failure of the single cell.

[0005] In a first aspect, the present application provides a battery housing assembly, comprising:

[0006] A housing is provided with a receiving cavity;

[0007] A partition is arranged in the shell to divide the accommodating chamber into a first accommodating sub-chamber and a second accommodating sub-chamber; the first accommodating sub-chamber is used to arrange the battery body, and the second accommodating sub-chamber is used to store the fire-fighting agent; the partition is provided with a mounting hole; the battery body includes an electrode connector;

[0008] A valve body, which is arranged in the mounting hole; the valve body is used to open when thermal runaway occurs in the battery body to connect the first receiving sub-cavity with the second receiving sub-cavity, so as to spray the fire-fighting agent toward the battery body;

[0009] A cutting piece, the first end of which is arranged in the second accommodating sub-cavity; the cutting piece is used for extending the second end of the cutting piece from the valve body when the valve body is opened to cut off the electrode connecting piece.

[0010] In one embodiment, the electrode connector includes a positive electrode connector and a negative electrode connector;

[0011] The cut-off piece is used to cut off the positive electrode connector and / or the negative electrode connector.

[0012] In one of the embodiments, the valve body is provided with a baffle;

[0013] The baffle is used to abut the second end of the cutting piece when the valve body is closed, so that the cutting piece is located in the second accommodating sub-cavity; the baffle is also used to disengage the second end of the cutting piece when the valve body is opened, so that the second end of the cutting piece extends out of the valve body.

[0014] In one embodiment, the battery cell body includes a heat concentrating surface;

[0015] The partition is arranged adjacent to the heat concentration surface of the battery cell body.

[0016] In one embodiment, the heat concentration surface includes a heat concentration point;

[0017] The mounting hole is arranged adjacent to the heat concentration point of the battery cell body.

[0018] In one embodiment, the battery housing assembly further includes a detector, which is arranged in linkage with the valve body;

[0019] The detector is used to detect the sensor signal of the battery cell body and control the opening and closing of the valve body according to the sensor signal.

[0020] In one of the embodiments, the detector is disposed in the first accommodating sub-cavity.

[0021] In one embodiment, the cutting member is an insulating elastic blade.

[0022] In a second aspect, the present application provides a lithium battery, comprising a battery cell body and a battery casing assembly as described above; the battery cell body is disposed in the battery casing assembly.

[0023] In a third aspect, the present application provides a battery pack comprising a plurality of lithium batteries as described above; the lithium batteries are connected in series and / or in parallel.

[0024] One of the above technical solutions has the following advantages and beneficial effects:

[0025] The above-mentioned battery shell assembly includes a shell, a partition, a valve body and a cut-off piece, and a accommodating chamber is arranged in the shell; the partition is arranged in the shell to divide the accommodating chamber into a first accommodating sub-chamber and a second accommodating sub-chamber; the first accommodating sub-chamber is used to arrange the battery body, and the second accommodating sub-chamber is used to store the fire-fighting agent; the partition is provided with a mounting hole; the battery body includes an electrode connector; the valve body is arranged in the mounting hole; the valve body is used to open when the battery body has thermal runaway to connect the first accommodating sub-chamber with the second accommodating sub-chamber, so as to spray the fire-fighting agent into the battery body; the first end of the cut-off piece is arranged in the second accommodating sub-chamber; the cut-off piece is used to extend the second end of the cut-off piece from the valve body when the valve body is opened to cut off the electrode connector, so as to realize that when the battery body has thermal runaway, the fire-fighting function and the automatic circuit-breaking function of the battery body can be automatically triggered. The present application optimizes the design of the battery shell assembly, divides the accommodating chamber in the shell into a first accommodating sub-chamber and a second accommodating sub-chamber through a partition, and arranges a valve body on the mounting hole of the partition, so that when the valve body is opened, the fire-fighting agent can be sprayed toward the battery cell body through the valve body, thereby realizing fire-fighting and extinguishing of the battery cell body. At the same time, when the valve body is opened, the cut-off piece can extend from the valve body to cut off the electrode connector of the battery cell body, thereby realizing automatic circuit breaking of the battery cell body. When thermal runaway occurs inside a single battery cell, the single battery cell with thermal runaway can be quickly isolated, responded to quickly, and precisely controlled with fire-fighting measures with a small impact range, thereby avoiding the spread of thermal runaway of the entire battery pack due to thermal runaway of the single battery cell, and avoiding damage to other electrical components due to failure of the single battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the first state structure of the battery housing assembly in an embodiment of the present application;

[0027] Figure 2 This is a schematic diagram of the second state structure of the battery housing assembly in the embodiment of the present application;

[0028] Figure 3 It is a schematic diagram of the assembly structure of the battery housing assembly in the embodiment of the present application.

[0029] Reference numerals:

[0030] 10. Shell; 100. Accommodation chamber; 110. First accommodation sub-chamber; 120. Second accommodation sub-chamber; 20. Partition; 30. Valve body; 300. Baffle; 40. Cut-off piece; 50. Cell body; 60. Fire-fighting agent; 70. Detector. DETAILED DESCRIPTION

[0031] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0032] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover inclusions that are not listed. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0033] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0034] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0035] In addition, the term "plurality" shall mean two or more.

[0036] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0037] In one embodiment, Figures 1 to 3As shown, a battery shell assembly is provided, including a shell 10, a partition 20, a valve body 30 and a cut-off piece 40, wherein a accommodating chamber 100 is arranged in the shell 10; the partition 20 is arranged in the shell 10 to divide the accommodating chamber 100 into a first accommodating sub-chamber 110 and a second accommodating sub-chamber 120; the first accommodating sub-chamber 110 is used to arrange a battery cell body 50, and the second accommodating sub-chamber 120 is used to store a fire-fighting agent 60; the partition 20 is provided with a mounting hole (not shown in the figure); the battery cell body 50 includes an electrode connector (not shown in the figure); the valve body 30 is arranged in the mounting hole; the valve body 30 is used to open when the battery cell body 50 has thermal runaway to connect the first accommodating sub-chamber 110 with the second accommodating sub-chamber 120, so as to spray the fire-fighting agent 60 into the battery cell body 50; the first end of the cut-off piece 40 is arranged in the second accommodating sub-chamber 120; the cut-off piece 40 is used to extend the second end of the cut-off piece 40 from the valve body 30 when the valve body 30 is opened, so as to cut off the electrode connector.

[0038] Among them, the battery shell 10 component can be applied to lithium batteries, and the lithium batteries can be but are not limited to square batteries, soft-pack batteries, cylindrical batteries or special-shaped batteries. The shape of the shell 10 can be determined according to the specific shape of the lithium battery. The shell 10 can be a metal shell 10 or a non-metal shell 10.

[0039] The housing 10 is provided with a housing chamber 100, and the partition 20 and the housing 10 may be an integrally formed structure; in another example, the partition 20 may also be provided in the housing chamber 100 by welding or bonding. The partition 20 divides the housing chamber 100 into a first housing sub-chamber 110 and a second housing sub-chamber 120, and the battery body 50 is provided in the first housing sub-chamber 110, and the second housing sub-chamber 120 is used to store the fire-fighting agent 60. Exemplarily, the inner wall of the second housing sub-chamber 120 may be provided with an anti-corrosion layer to prevent the fire-fighting agent 60 from corroding the second housing sub-chamber 120. In another example, the housing 10 may be made of an anti-corrosion material. The volume of the first housing sub-chamber 110 is greater than that of the second housing sub-chamber 120. For example, the dosage of the fire-fighting agent 60 added may be determined according to the energy of the battery body 50, thereby determining the volume of the second housing sub-chamber 120.

[0040] The partition 20 may be disposed adjacent to a side surface (such as the left side surface, the right side surface, the front side surface, or the rear side surface) of the housing 10; the partition 20 may also be disposed adjacent to the bottom surface or the top surface of the housing 10. In another example, the partition 20 may also be disposed adjacent to and parallel to a side surface (such as the left side surface, the right side surface, the front side surface, or the rear side surface) of the housing 10; the partition 20 may also be disposed adjacent to and parallel to the bottom surface or the top surface of the housing 10.

[0041] The partition plate 20 is provided with a mounting hole, and the mounting hole can be used to install the valve body 30. Exemplarily, the valve body 30 can be sleeved on the mounting hole of the partition plate 20, and the valve body 30 and the mounting hole are sealed. For example, a sealant can be provided between the valve body 30 and the mounting hole to prevent the fire-fighting agent 60 in the second accommodating sub-chamber 120 from leaking. The fire-fighting agent 60 can be, but is not limited to, heptafluoropropane or carbon dioxide.

[0042] The battery cell body 50 refers to the lithium battery cell body. The battery cell body 50 is provided with an electrode connector. The electrode connector can be an electrode current collector. The electrode connector is used to transmit electrical signals. The cut-off piece 40 is a cut-off piece 40 made of insulating material. Exemplarily, the cut-off piece 40 can also be an elastic metal piece. An insulating layer can be provided on the outer surface of the cut-off piece 40 to obtain a cut-off piece 40 with an insulating function. The first end of the cut-off piece 40 can be fixedly disposed in the second accommodating sub-cavity 120. When the valve body 30 is in the closed state, the cut-off piece 40 is located in the second accommodating sub-cavity 120, and the cut-off piece 40 is in a compressed state; when the valve body 30 is in the open state, the second end of the cut-off piece 40 can extend from the valve body 30, and the cut-off piece 40 is elongated, so that the cut-off piece 40 returns to the deformed state.

[0043] When thermal runaway occurs in the battery cell body 50, the valve body 30 is triggered to open, so that the first containing sub-cavity 110 is connected to the second containing sub-cavity 120, and then the fire-fighting agent 60 is sprayed out from the valve body 30 and sprayed on the battery cell body 50, thereby realizing fire-fighting of the battery cell body 50; at the same time, the cutting piece 40 can be extended from the valve body 30, so that the cutting piece 40 can cut off the electrode connector on the battery cell body 50, thereby realizing automatic circuit breaking of the battery cell body 50, so that the inside of the battery cell body 50 is quickly isolated from other electrical components, thereby playing a dual protection role.

[0044] In the above-mentioned battery shell 10 assembly, a accommodating chamber 100 is set in the shell 10; a partition 20 is set in the shell 10 to divide the accommodating chamber 100 into a first accommodating sub-chamber 110 and a second accommodating sub-chamber 120; the first accommodating sub-chamber 110 is used to set the battery body 50, and the second accommodating sub-chamber 120 is used to store the fire-fighting agent 60; the partition 20 is provided with a mounting hole; the battery body 50 includes an electrode connector; the valve body 30 is set in the mounting hole; the valve body 30 is used to open when the battery body 50 has thermal runaway to connect the first accommodating sub-chamber 110 with the second accommodating sub-chamber 120, so as to spray the fire-fighting agent 60 into the battery body 50; the first end of the cutting piece 40 is set in the second accommodating sub-chamber 120; the cutting piece 40 is used to extend the second end of the cutting piece 40 from the valve body 30 when the valve body 30 is opened to cut off the electrode connector, so as to realize that when the battery body 50 has thermal runaway, the fire-fighting function and the automatic circuit-breaking function of the battery body 50 can be automatically triggered. The present application optimizes the design of the battery shell 10 assembly, divides the accommodating chamber 100 in the shell 10 into a first accommodating sub-chamber 110 and a second accommodating sub-chamber 120 through a partition 20, and sets a valve body 30 on the mounting hole of the partition 20, so that when the valve body 30 is opened, the fire-fighting agent 60 can be sprayed toward the battery cell body 50 through the valve body 30 to achieve fire-fighting of the battery cell body 50, and at the same time, when the valve body 30 is opened, the cut-off piece 40 can extend from the valve body 30 to cut off the electrode connector of the battery cell body 50 to achieve automatic circuit breaking of the battery cell body 50, and can quickly isolate, respond quickly, and accurately control the single cell that has thermal runaway when thermal runaway occurs inside the single cell, and the fire-fighting measures with a small impact range can be taken to avoid the thermal runaway of the entire battery pack caused by the thermal runaway of the single cell and avoid the failure of the single cell causing damage to other electrical components.

[0045] In one embodiment, the electrode connector includes a positive electrode connector and a negative electrode connector; the cut-off member 40 is used to cut off the positive electrode connector and / or the negative electrode connector.

[0046] The positive electrode connector may be a positive electrode current collector of the battery cell body 50 , and the negative electrode connector may be a negative electrode current collector of the battery cell body 50 .

[0047] For example, when thermal runaway occurs in the battery cell body 50, the valve body 30 is triggered to open, and the cut-off piece 40 can extend from the valve body 30, so that the cut-off piece 40 can cut off the positive electrode connector on the battery cell body 50, thereby disconnecting the electrical signal transmission on the battery cell body 50, and realizing automatic circuit breaking of the battery cell body 50, so that the interior of the battery cell body 50 is quickly isolated from other electrical components, avoiding the spread of thermal runaway of other battery cell bodies 50 caused by thermal runaway of a single battery cell body 50 and damage to other electrical components due to failure of a single battery cell body 50.

[0048] For another example, when the battery cell body 50 has thermal runaway, the valve body 30 is triggered to open, and the cut-off piece 40 can be extended from the valve body 30, so that the cut-off piece 40 can cut off the negative electrode connector on the battery cell body 50, and then disconnect the electrical signal transmission on the battery cell body 50, so as to automatically disconnect the battery cell body 50, so as to quickly isolate the inside of the battery cell body 50 from other electrical components. For another example, when the battery cell body 50 has thermal runaway, the valve body 30 is triggered to open, and the cut-off piece 40 can be extended from the valve body 30, so that the cut-off piece 40 can simultaneously cut off the negative electrode connector and the positive electrode connector on the battery cell body 50, and then disconnect the electrical signal transmission on the battery cell body 50, so as to automatically disconnect the battery cell body 50, so as to quickly isolate the inside of the battery cell body 50 from other electrical components.

[0049] In one embodiment, Figure 1 As shown, the valve body 30 is provided with a baffle 300; the baffle 300 is used to abut the second end of the cutting piece 40 when the valve body 30 is closed, so that the cutting piece 40 is located in the second accommodating sub-chamber 120; the baffle 300 is also used to disengage from the second end of the cutting piece 40 when the valve body 30 is opened, so that the second end of the cutting piece 40 extends out of the valve body 30.

[0050] The baffle 300 can be used to limit the cutting member 40 in the second accommodating sub-chamber 120 when the valve body 30 is closed.

[0051] The baffle 300 and the valve body 30 may be an integrally formed structure. In another example, the baffle 300 may be fixedly arranged on the valve body 30 by welding or screwing. The baffle 300 can move with the movement of the valve of the valve body 30. For example, when the valve body 30 is closed, the second end of the cut-off piece 40 abuts against the baffle 300, so that the cut-off piece 40 is in a compressed state. When the valve body 30 is opened, the valve of the valve body 30 drives the baffle 300 to move, and the second end of the cut-off piece 40 is separated from the baffle 300, so that the second end of the cut-off piece 40 can extend from the valve body 30, and then the electrode connector on the battery cell body 50 is cut off by the cut-off piece 40, so as to realize automatic circuit breaking of the battery cell body 50, so that the inside of the battery cell body 50 is quickly isolated from other electrical components, reducing the impact of thermal runaway of the battery cell body 50, and avoiding damage to other electrical components caused by failure of the battery cell body 50.

[0052] In one embodiment, the battery cell body 50 includes a heat concentration surface; the separator 20 is disposed adjacent to the heat concentration surface of the battery cell body 50 .

[0053] The heat concentration surface refers to an end surface of the battery cell body 50 where the heat concentration is the largest. The heat concentration surface of the battery cell body 50 can be determined based on the internal structure of the battery cell body 50 and a thermal runaway test of the battery cell body 50 .

[0054] By arranging the partition 20 adjacent to the heat concentration surface of the battery cell body 50, when the battery cell body 50 undergoes thermal runaway, the valve body 30 is triggered to open, and the fire-fighting agent 60 is ejected from the valve body 30, and the fire-fighting agent 60 is sprayed toward the heat concentration surface of the battery cell body 50, thereby improving the fire-fighting efficiency of the battery cell body 50; at the same time, the cutting piece 40 can extend from the valve body 30, so that the cutting piece 40 can cut off the electrode connector on the battery cell body 50, thereby realizing automatic circuit breaking of the battery cell body 50, so that the inside of the battery cell body 50 is quickly isolated from other electrical components, thereby playing a dual protection role.

[0055] In one embodiment, the heat concentration surface includes a heat concentration point; and the mounting hole is disposed adjacent to the heat concentration point of the battery cell body 50 .

[0056] The heat concentration point refers to the position where the heat concentration is the largest in the heat concentration surface. The heat concentration point of the battery cell body 50 can be determined according to the internal structure of the battery cell body 50 and a thermal runaway test of the battery cell body 50 .

[0057] By setting the mounting hole adjacent to the heat concentration point of the battery cell body 50, and thereby making the valve body 30 adjacent to the heat concentration point of the battery cell body 50, when the battery cell body 50 has thermal runaway, the valve body 30 is triggered to open, and then the fire-fighting agent 60 is sprayed out from the valve body 30, and the fire-fighting agent 60 is sprayed toward the heat concentration point of the battery cell body 50, thereby further improving the fire-fighting efficiency of the battery cell body 50; at the same time, the cutting piece 40 can extend from the valve body 30, so that the cutting piece 40 can cut off the electrode connector on the battery cell body 50, thereby realizing automatic circuit breaking of the battery cell body 50, so that the inside of the battery cell body 50 is quickly isolated from other electrical components, thereby playing a dual protection role.

[0058] In one embodiment, Figure 3 As shown, the battery housing 10 assembly further includes a detector 70 , which is arranged in linkage with the valve body 30 ; the detector 70 is used to detect the sensor signal of the battery cell body 50 , and control the opening and closing of the valve body 30 according to the sensor signal.

[0059] The detector 70 can be used to detect changes in environmental data in the first containing sub-chamber 110. The detector 70 can be, but is not limited to, a temperature sensor, a pressure sensor, or a gas concentration sensor, and the detector 70 can be any combination of a temperature sensor, a pressure sensor, or a gas concentration sensor. Accordingly, the sensing signal can be any one or any combination of the following: air pressure, gas concentration, and temperature in the first containing sub-chamber 110.

[0060] For example, the valve body 30 is a solenoid valve, and the detector 70 is linked to the valve body 30. The detector 70 can detect the air pressure and temperature in the first containing sub-cavity 110 (i.e., the battery body 50) in real time. When the detected air pressure and temperature reach the corresponding critical value (the critical value can be set according to the air pressure and temperature when the explosion-proof valve of the battery body 50 is opened), the valve body 30 is triggered to open, and then the fire-fighting agent 60 is sprayed from the valve body 30, and the fire-fighting agent 60 is sprayed on the battery body 50, thereby realizing the fire-fighting or cooling of the battery body 50, and controlling the thermal runaway of the battery body 50 in the containing cavity 100 to avoid heat spread. At the same time, the cut-off piece 40 can extend from the valve body 30, so that the cut-off piece 40 can cut off the electrode connector on the battery body 50, thereby realizing the automatic circuit breaking of the battery body 50, so that the inside of the battery body 50 is quickly isolated from other electrical parts, playing a double protection role.

[0061] In one example, if Figure 1 and Figure 3 As shown, the detector 70 is disposed in the first containing sub-cavity 110. For example, the detector 70 can be disposed on the partition 20, and the environmental data such as the air pressure and temperature in the first containing sub-cavity 110 are detected in real time by the detector 70, and then when the environmental data reaches a critical value, the valve body 30 is triggered to open, and it is determined that the corresponding battery body 50 has thermal runaway. The monitoring range of the detector 70 is small, the detection space is closed, the monitoring result is accurate, and the trigger valve body 30 has a fast response rate.

[0062] In one example, the cutting member 40 is an insulating elastic blade.

[0063] For example, the insulating elastic blade may include an elastic member (such as a spring) and a blade, the first end of the elastic member is arranged in the second accommodating sub-cavity 120, the second end of the elastic member is connected to the blade, a guide groove is also arranged in the mounting hole, and the blade is provided with a guide block cooperating with the guide groove. When the valve body 30 is closed, the elastic member is in a compressed state, so that the blade is located in the second accommodating sub-cavity; when the valve body 30 is opened, the elastic member extends from the valve body 30, so that the blade extends along the guide groove through the guide block, cutting off the connection position between the battery cell main body 50 and the electrode connector, disconnecting the connection between the battery cell main body 50 and the electrode connector, and realizing the internal short-circuit state of the battery cell main body 50, so that the inside of the battery cell main body 50 is quickly isolated from other electrical components, avoiding damage to other electrical components due to failure of a single battery cell main body 50. In one example, the pole ear of the battery cell body 50 is connected to the electrode connector, and when the blade is extended along the guide groove through the guide block, the connection position between the pole ear and the electrode connector can be cut off; or the electrode connector has a connecting portion connected to the pole of the battery cell body 50, and when the blade is extended along the guide groove through the guide block, the connecting portion can be cut off, thereby achieving an internal short-circuit state of the battery cell body 50.

[0064] In one embodiment, a lithium battery is further provided, comprising a battery cell body and a battery casing assembly as described above; the battery cell body is disposed in the battery casing assembly.

[0065] The battery cell body may be a lithium battery cell body. The specific description of the battery cell body and the battery housing assembly may refer to the specific description of the battery cell body and the battery housing assembly in the above embodiment, which will not be repeated here.

[0066] In the above-mentioned embodiments, the battery shell assembly includes a shell, a partition, a valve body and a cut-off piece, and a accommodating chamber is arranged in the shell; the partition is arranged in the shell to divide the accommodating chamber into a first accommodating sub-chamber and a second accommodating sub-chamber; the first accommodating sub-chamber is used to arrange the battery cell body, and the second accommodating sub-chamber is used to store the fire-fighting agent; the partition is provided with a mounting hole; the battery cell body includes an electrode connector; the valve body is arranged in the mounting hole; the valve body is used to open when the battery cell body has thermal runaway to connect the first accommodating sub-chamber with the second accommodating sub-chamber, so as to spray the fire-fighting agent into the battery cell body; the first end of the cut-off piece is arranged in the second accommodating sub-chamber; the cut-off piece is used to extend the second end of the cut-off piece from the valve body when the valve body is opened to cut off the electrode connector, so as to realize that when the battery cell body has thermal runaway, the fire-fighting function and the automatic circuit-breaking function of the battery cell body can be automatically triggered. The present application optimizes the design of the battery shell assembly, divides the accommodating chamber in the shell into a first accommodating sub-chamber and a second accommodating sub-chamber through a partition, and arranges a valve body on the mounting hole of the partition, so that when the valve body is opened, the fire-fighting agent can be sprayed toward the battery cell body through the valve body, thereby realizing fire-fighting and extinguishing of the battery cell body. At the same time, when the valve body is opened, the cut-off piece can extend from the valve body to cut off the electrode connector of the battery cell body, thereby realizing automatic circuit breaking of the battery cell body. When thermal runaway occurs inside a single battery cell, the single battery cell with thermal runaway can be quickly isolated, responded to quickly, and precisely controlled with fire-fighting measures with a small impact range, thereby avoiding the spread of thermal runaway of the entire battery pack due to thermal runaway of the single battery cell, and avoiding damage to other electrical components due to failure of the single battery cell.

[0067] In one embodiment, the present application provides a battery pack, comprising a plurality of lithium batteries as described above; each lithium battery is connected in series and / or in parallel.

[0068] By connecting the lithium batteries in series and / or in parallel to form a battery pack, when thermal runaway is detected in a certain lithium battery unit, firefighting measures with a small impact range can be taken to quickly isolate, quickly respond, and accurately control the lithium battery with thermal runaway, thereby preventing the thermal runaway of the entire battery pack from spreading due to thermal runaway of a single battery cell, and preventing damage to other electrical components due to failure of a single battery cell. The thermal runaway spread of the battery cell can be controlled in advance inside a single lithium battery, reducing losses. The safety fire hazards of the entire battery pack system only need to consider the fire hazards of the electrical equipment in the battery pack, reducing the complexity of the fire protection equipment of the entire system.

[0069] It should be noted that the battery pack may also include components such as electrical equipment, and a specific battery pack may include more components than those described in the above embodiments, or combine certain components, or have a different arrangement of components.

[0070] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0071] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the utility model patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A battery housing assembly, characterized in that: include: A housing having a receiving cavity disposed therein; A partition, the partition is arranged in the shell to divide the accommodating chamber into a first accommodating sub-chamber and a second accommodating sub-chamber; the first accommodating sub-chamber is used to arrange the battery body, and the second accommodating sub-chamber is used to store the fire-fighting agent; the partition is provided with a mounting hole; the battery body includes an electrode connector; a valve body, the valve body being arranged in the mounting hole; the valve body being used to open when thermal runaway occurs in the battery cell body so as to connect the first accommodating sub-cavity with the second accommodating sub-cavity, so as to spray the fire-fighting agent toward the battery cell body; A cutting piece, wherein a first end of the cutting piece is disposed in the second accommodating sub-cavity; The cutting piece is used for cutting off the electrode connecting piece when the valve body is opened, and the second end of the cutting piece extends out from the valve body.

2. The battery housing assembly according to claim 1, characterized in that: The electrode connector includes a positive electrode connector and a negative electrode connector; The cutting piece is used to cut off the positive electrode connector and / or the negative electrode connector.

3. The battery housing assembly according to claim 2, characterized in that: The valve body is provided with a baffle; The baffle is used to abut the second end of the cutting piece when the valve body is closed, so that the cutting piece is located in the second accommodating sub-cavity; the baffle is also used to disengage from the second end of the cutting piece when the valve body is opened, so that the second end of the cutting piece extends out of the valve body.

4. The battery housing assembly according to claim 1, characterized in that: The battery cell body includes a heat concentration surface; The partition is arranged adjacent to the heat concentration surface of the battery core body.

5. The battery housing assembly according to claim 4, characterized in that: The heat concentration surface includes a heat concentration point; The mounting hole is arranged adjacent to a heat concentration point of the battery core body.

6. The battery housing assembly according to any one of claims 1 to 5, characterized in that: It also includes a detector, which is arranged in linkage with the valve body; The detector is used to detect the sensor signal of the battery body and control the opening and closing of the valve body according to the sensor signal.

7. The battery housing assembly according to claim 6, characterized in that: The detector is arranged in the first accommodating sub-cavity.

8. The battery housing assembly according to claim 6, characterized in that: The cutting piece is an insulating elastic blade.

9. A lithium battery, characterized in that: It comprises a battery cell body and a battery casing assembly as claimed in any one of claims 1 to 8; the battery cell body is arranged in the battery casing assembly.

10. A battery pack, characterized in that: It comprises a plurality of lithium batteries as claimed in claim 9; each of the lithium batteries is connected in series and / or in parallel.

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