WO2023241016A1

WO2023241016A1 - Battery and battery module

Info

Publication number: WO2023241016A1
Application number: PCT/CN2022/144147
Authority: WO
Inventors: 戴亨伟; 张立鹏; 林�建; 林秀德; 胡春波; 杨伟; 张耀
Original assignee: 欣旺达惠州动力新能源有限公司
Priority date: 2022-06-13
Filing date: 2022-12-30
Publication date: 2023-12-21
Also published as: CN218274965U

Abstract

The present application provides a battery and a battery module. The battery comprises bare battery cells, a housing, an explosion-proof valve, an exhaust channel member, and at least one end cover assembly; the bare battery cells and the exhaust channel member are all arranged in the housing; the end cover assembly is connected to an end portion of the housing and seals an accommodating cavity; the at least one end cover assembly is electrically connected to the bare battery cells; the explosion-proof valve is installed on a side portion of the housing; the exhaust channel member is arranged between the side of each of the bare battery cells close to the explosion-proof valve and the side of the housing where the explosion-proof valve is mounted; the exhaust channel member is provided with an exhaust surface; an exhaust port is formed on the exhaust surface; the area of the exhaust port on the exhaust surface is more than one half of the area of the exhaust surface; and the exhaust port communicates the explosion-proof valve with the accommodating cavity. According to the battery and the battery module provided by the present application, the exhaust resistance of the battery is small, and the battery can exhaust gas smoothly.

Description

Batteries and battery modules

Cross-references to related applications

This application claims priority to the Chinese patent application filed with the China Patent Office on June 13, 2022, with the application number 202221470203.3 and the invention name "Battery and Battery Module", the entire content of which is incorporated into this application by reference.

Technical field

The present application relates to the field of battery technology, and in particular, to a battery and a battery module.

Background technique

During the operation of the battery, the reaction between the bare cells of the battery and the electrolyte will produce gas. In order to prevent gas from accumulating inside the battery and causing the battery to explode, some batteries are equipped with explosion-proof valves. When the air pressure inside the battery is too high, the explosion-proof valve will open to allow the gas inside the battery to be discharged to the outside of the battery.

For some relatively long batteries, the explosion-proof valve will be set on the side of the battery casing; however, the exhaust resistance of this type of battery is large, which is not conducive to the rapid discharge of gas inside the battery.

Contents of the invention

This application aims to solve at least one of the technical problems existing in the prior art. To this end, this application proposes a battery with small exhaust resistance and the battery can exhaust smoothly.

This application also proposes a battery module having the above-mentioned battery.

A battery according to an embodiment of the first aspect of the present application includes: a bare battery core; a casing with an accommodation cavity inside, the bare battery core being disposed in the accommodation cavity; and at least one end cover assembly connected to the shell. The end of the body closes the accommodation cavity, and at least one of the end cover components is electrically connected to the bare battery core; an explosion-proof valve is installed on the side of the housing, and the explosion-proof valve can operate under a preset pressure. Open to allow gas in the accommodation cavity to be discharged; an exhaust channel member is provided in the accommodation cavity and between the bare battery core and the explosion-proof valve, the exhaust channel member has an exhaust surface, the exhaust surface is provided with an exhaust port, the area of the exhaust port on the exhaust surface accounts for more than half of the area of the exhaust surface, and the exhaust port is connected to the exhaust surface. explosion-proof valve and the containing chamber.

The battery according to the embodiment of the present application at least has the following beneficial effects: when the air pressure inside the casing is too high, the gas generated after the reaction between the electrolyte and the bare cell can be discharged to the casing through the exhaust port and the explosion-proof valve. external. Since an exhaust channel piece is provided between the side of the bare battery core close to the explosion-proof valve and the side of the case where the explosion-proof valve is provided, the exhaust channel piece is equivalent to being clamped between the bare battery core and the case. When the battery core expands or the battery as a whole is shaken, the exhaust channel member can resist the bare battery core or the casing, preventing the bare battery core and the casing from approaching each other, thereby ensuring that the side of the bare battery core facing the explosion-proof valve is in contact with the casing. There should be enough space between the sides where the explosion-proof valve is installed to ensure that gas can smoothly flow to the explosion-proof valve and be discharged from the explosion-proof valve. Moreover, since the area of the exhaust port on the exhaust surface accounts for more than half of the total area of the exhaust surface, the exhaust port is larger, which is beneficial to reducing the resistance of gas passing through the exhaust channel components, thereby reducing the battery's Exhaust resistance facilitates the discharge of gas inside the battery.

According to some embodiments of the present application, the end cap assembly is connected to an end of the exhaust channel member, the end of the exhaust channel member has a first escape groove, and the first escape groove is disposed on the exhaust The channel member is close to the side of the explosion-proof valve. In the projection direction perpendicular to the end cover assembly, the explosion-proof valve is spaced apart from the first escape groove to form an escape channel.

According to some embodiments of the present application, the exhaust channel component includes a main body part and a raised part, the main body part has an exhaust channel, and the raised part is connected to a side of the main body part close to the explosion-proof valve. , one end of the raised portion away from the main body portion has the exhaust surface and the exhaust port, the exhaust port is connected with the exhaust channel, and the raised portion is relative to the inside of the main body portion. The second escape groove is formed toward the corner of the housing.

According to some embodiments of the present application, one end of the end cover assembly close to the explosion-proof valve has a resisting surface, and the resisting surface resists a side of the exhaust channel member facing the bare battery core, so as to Impeding the movement of the exhaust channel member in a direction closer to the bare battery core.

According to some embodiments of the present application, the end cover assembly includes a positioning body disposed on the resisting surface, the end of the exhaust channel member has a positioning hole, and the positioning body is inserted into the positioning hole. ; Alternatively, the resisting surface is recessed to form a positioning hole, and the end of the exhaust channel member is protruding to form a positioning body, and the positioning body is inserted into the positioning hole.

According to some embodiments of the present application, an inner insulating film is further included, the inner insulating film is wrapped around the outer surface of the bare cell, the inner insulating film has air holes, and the air holes are connected to the exhaust port.

According to some embodiments of the present application, an outer insulating film is also included. The outer insulating film is wrapped around the outer surface of the housing. The outer insulating film has a first escape hole, and the first escape hole exposes the explosion-proof valve. .

According to some embodiments of the present application, the outer insulating film includes a plurality of insulating parts, wherein at least one of the insulating parts covers a plurality of adjacent outer surfaces of the housing.

According to some embodiments of the present application, one end of the housing has an opening, and the other end of the housing has a second escape hole, and the opening and the second escape hole are respectively connected with the accommodation cavity, and the There is an opening for the bare battery core to enter the accommodation cavity, and the number of the end cover assemblies is two. One end cover component is electrically connected to one end of the bare battery core and covers the opening, and the other end cover component is electrically connected to one end of the bare battery core and covers the opening. The end cover component is electrically connected to the other end of the bare cell and penetrates the second escape hole.

A battery module according to a second embodiment of the present application includes: the battery of the first embodiment, wherein a plurality of batteries are provided; and a module casing, and the batteries are installed in the module casing.

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

Description of the drawings

The present application will be further described below in conjunction with the accompanying drawings and examples, wherein:

Figure 1 is a three-dimensional schematic diagram of a battery according to an embodiment of the present application;

Figure 2 is an exploded schematic diagram of the battery in Figure 1;

Figure 3 is a schematic diagram of the exhaust channel member of the battery in Figure 2;

Figure 4 is a front view of the exhaust channel member of Figure 3;

Figure 5 is a schematic diagram of the positional relationship between the exhaust channel parts and the housing;

Figure 6 is a schematic diagram of the end of the end cover assembly of the battery in some embodiments of the present application;

Figure 7 is a schematic diagram of the end cover assembly of Figure 6 connected to the exhaust channel member;

Figure 8 is a schematic diagram of the air holes on the inner insulating film of the battery in some embodiments of the present application;

Figure 9 is a schematic diagram of the assembly method of the housing and the bare battery core in another embodiment of the present application;

Figure 10 is a simplified schematic diagram of the housing in Figure 9;

Figure 11 is a schematic diagram of the liquid injection hole in some embodiments of the present application;

Figure 12 is a schematic diagram of an outer insulating film of a battery in some embodiments of the present application.

Reference signs: 100-battery, 101-casing, 102-explosion-proof valve, 103-end cover assembly, 104-pole post, 201-bare battery core, 202-pole lug, 203-exhaust channel parts, 204-inner Insulating film, 205-mounting hole, 206-air hole, 207-accommodating cavity, 208-exhaust port, 209-exhaust channel, 210-exhaust surface, 301-main part, 302-convex part, 303-No. One escape groove, 304-positioning hole, 401-second escape groove, 402-corner, 403-evacuation channel, 501-resistance surface, 502-positioning body, 503-cover plate, 504-plastic parts, 801-second Avoidance hole, 901-opening, 1001-seal, 1002-liquid injection hole, 1101-outer insulation film, 1102-first insulation part, 1103-second insulation part, 1104-third insulation part, 1105-third avoidance Hole, 1106 - first escape hole, 1107 - fourth insulating part.

Detailed ways

The embodiments of the present application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present application and cannot be understood as limiting the present application.

In the description of this application, it should be understood that the orientation descriptions involved, such as the orientation or positional relationship indicated by up, down, front, back, left, right, etc. are based on the orientation or positional relationship shown in the drawings, and are only In order to facilitate the description of the present application and simplify the description, it is not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation of the present application.

In the description of this application, several means one or more, plural means two or more, greater than, less than, exceeding, etc. are understood to exclude the original number, and above, below, within, etc. are understood to include the original number. If there is a description of first and second, it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the order of indicated technical features. relation.

In the description of this application, unless otherwise explicitly limited, words such as setting, installation, and connection should be understood in a broad sense. Those skilled in the art can reasonably determine the specific meaning of the above words in this application in conjunction with the specific content of the technical solution.

In the description of this application, reference to the description of the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" is intended to be in conjunction with the description of the embodiment. or examples describe specific features, structures, materials, or characteristics that are included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The present application provides a battery 100. Referring to Figures 1 and 2, the battery 100 includes a bare cell 201, a casing 101, an end cover assembly 103, an explosion-proof valve 102 and an exhaust channel member 203.

Referring to FIG. 2 , the housing 101 is hollow. The housing 101 has an accommodating cavity 207 inside, and the bare battery core 201 is disposed in the accommodating cavity 207 . The bare battery core 201 may be a wound battery core or a laminated battery core. The battery 100 also includes an electrolyte (not shown). The electrolyte is also disposed in the accommodation cavity 207 , and the bare battery core 201 is in contact with the electrolyte.

At least one end cover assembly 103 is provided. The end cover assembly 103 is connected to the end of the housing 101 to close the accommodation cavity 207 . At least one end cover assembly 103 is electrically connected to the bare battery core 201 . For example, referring to Figure 10, the end of the housing 101 is provided with an opening 901 that communicates with the accommodating cavity 207, so that the bare battery core 201 can be installed into the accommodating cavity 207; the end cover assembly 103 is connected to the end of the housing 101, The cover assembly 103 can cover the opening 901 to close the receiving cavity 207 .

In some embodiments, the end cap assembly 103 may include a cover plate 503, a plastic part 504 and a pole 104. As shown in FIGS. 6 and 7 , the plastic part 504 is connected to a portion of the cover plate 503 close to the bare cell 201 . Side; with reference to FIG. 2 and FIG. 6 , a part of the pole 104 protrudes in a direction away from the bare battery core 201 relative to the cover plate 503 . Referring to FIG. 2 , the end of the bare battery core 201 has tabs 202 , and the tabs 202 are electrically connected to the pole posts 104 , thereby realizing the electrical connection between the bare battery core 201 and the end cap assembly 103 . Specifically, the pole tab 202 can be directly welded to the pole post 104, or the pole post 104 and the pole tab 202 can also be welded to the same metal plate, etc.

Referring to FIG. 1 , the explosion-proof valve 102 is installed on the side of the housing 101 . For example, referring to FIG. 2 , the housing 101 may be provided with a mounting hole 205 (the mounting hole 205 is connected to the accommodation cavity 207 ), and the explosion-proof valve 102 is embedded in the mounting hole 205 . After the air pressure in the accommodation chamber 207 reaches the preset pressure, the explosion-proof valve 102 opens and connects the accommodation chamber 207 to the environment outside the housing 101 . Then part of the gas in the accommodation chamber 207 can be discharged to the outside of the housing 101 through the explosion-proof valve 102 .

The specific arrangement of the explosion-proof valve 102 may take different forms. For example, the explosion-proof valve 102 has a diaphragm, and a score is provided on the diaphragm. When the air pressure in the accommodation chamber 207 reaches a preset pressure, the score on the diaphragm cracks, forming a gap or a hole for gas discharge. Alternatively, the explosion-proof valve 102 includes a valve body, a valve core and an elastic member. The valve core is arranged inside the valve body and blocks the exhaust passage of the valve body. The valve core is connected to the valve body through the elastic member; when the air pressure in the accommodation chamber 207 reaches When the pressure is preset, the gas in the accommodation chamber 207 overcomes the elastic force of the elastic member to push the valve core, releasing the sealing of the exhaust channel by the valve core so that the gas can be discharged; when the air pressure in the accommodation chamber 207 drops below the preset pressure, The elastic member drives the valve core to reset, and the valve core blocks the exhaust passage of the valve body again to prevent gas discharge.

1 and 2 , the exhaust channel member 203 is also disposed in the accommodation cavity 207 , and the exhaust channel member 203 is disposed between the bare battery core 201 and the explosion-proof valve 102 . The exhaust channel member 203 has an exhaust surface 210, and the exhaust surface 210 is provided with an exhaust port 208. The exhaust port 208 communicates the explosion-proof valve 102 with the accommodation cavity. The area of the exhaust port 208 on the exhaust surface 210 accounts for more than half of the total area of the exhaust surface. Taking FIG. 2 and FIG. 3 as an example, the exhaust surface 210 can be disposed on the side of the exhaust channel member 203 facing the explosion-proof valve 102 , that is, the exhaust surface 210 is the top surface of the exhaust channel member 203 . It should be noted that, taking Figure 2 as an example, since the exhaust channel member 203 is in a frame shape, the area of the exhaust surface 210 mentioned above specifically refers to the area of the shape enclosed by the outer edges of the exhaust surface 210. ; The area of the exhaust port 208 specifically refers to the area of the shape enclosed by the inner edges of the exhaust surface 210 . The area of the exhaust port 208 is part of the area of the exhaust surface 210 of the exhaust channel member 203 .

When the air pressure inside the casing 101 is too high, the gas generated after the reaction between the electrolyte and the bare cell 201 can pass through the exhaust port 208 and be discharged to the outside of the casing 101 through the explosion-proof valve 102 . Since the exhaust channel member 203 is provided between the side of the bare battery core 201 close to the explosion-proof valve 102 and the side of the housing 101 provided with the explosion-proof valve 102, the exhaust channel member 203 is equivalent to being clamped between the bare battery core 201 and the explosion-proof valve 102. Between the cases 101, when the bare cell 201 expands or the battery 100 as a whole is shaken, the exhaust channel member 203 can resist the bare cell 201 or the case 101, preventing the bare cell 201 and the case 101 from approaching each other. , thereby ensuring that there is sufficient space between the side of the bare battery core 201 facing the explosion-proof valve 102 and the side of the housing 101 with the explosion-proof valve 102 installed, thereby ensuring that gas can smoothly flow to the explosion-proof valve 102 and be discharged from the explosion-proof valve 102 . Moreover, since the area of the exhaust port 208 on the exhaust surface 210 accounts for more than half of the total area of the exhaust surface 210, the exhaust port 208 is larger, which is beneficial to reducing the exhaust resistance and facilitating the discharge of gas inside the battery 100. .

In some embodiments, the end of the exhaust channel member 203 is connected to the end cover assembly 103. Referring to Figures 3 and 4, the end of the exhaust channel member 203 has a first relief groove 303, and the first relief groove 303 is disposed on The exhaust channel member 203 is close to the side of the explosion-proof valve 102. Referring to FIG. 5, when viewed in the projection direction perpendicular to the end cover assembly 103, the explosion-proof valve 102 is spaced apart from the first escape groove 303 to form an escape channel 403. The projection direction perpendicular to the end cover assembly 103 specifically corresponds to from front to back or from back to front. In FIG. 2 , it may also correspond to the length direction of the housing 101 . Referring to Figure 7 or Figure 8, the first escape groove 303 can be connected with the exhaust port 208; combined with Figures 2 and 5, along the left and right direction, the width of the top of the first escape groove 303 is greater than the width of the explosion-proof valve 102.

During the process of assembling the battery 100, in order to facilitate the installation of the explosion-proof valve 102, the explosion-proof valve 102 is usually installed on the casing 101 first, and then the exhaust channel member 203, the bare battery core 201 and other components are installed into the accommodation cavity 207. middle. The first avoidance groove 303 is mainly provided to prevent the exhaust channel member 203 from scratching the explosion-proof valve 102 when it is installed in the housing 101, thereby reducing the risk of damage to the explosion-proof valve 102 when the battery 100 is assembled.

Specifically, taking FIG. 2 as an example, since the exhaust channel member 203 is relatively long, if the first escape groove 303 is not provided, then during the process of inserting the exhaust channel member 203 into the interior of the housing 101 from front to back, the exhaust gas will The surface of the channel member 203 on the side facing the explosion-proof valve 102 may contact the explosion-proof valve 102 for a long time and scratch the side of the explosion-proof valve 102 facing the bare battery core 201 , which may easily cause damage to the explosion-proof valve 102 . In the case where the first escape groove 303 is provided, when the exhaust channel member 203 passes under the explosion-proof valve 102, a certain space is left between the wall of the first escape groove 303 and the explosion-proof valve 102. The exhaust channel member 203 It is not easy to scratch the explosion-proof valve 102.

Referring to Figure 4, in some embodiments, the exhaust channel member 203 also has a second escape groove 401. The second escape groove 401 is used to avoid the corner 402 inside the housing 101 to facilitate the installation of the exhaust channel member 203. Specifically, the exhaust channel member 203 includes a main body part 301 and a raised part 302. With reference to Figure 3, the main body part 301 is frame-shaped. The main body part 301 has an exhaust channel 209. The raised part 302 and the main body part 301 are close to the explosion-proof valve. 102 is connected on one side, and the end of the protruding portion 302 away from the main body portion 301 has an exhaust surface 210 and an exhaust port 208 . Combining Figure 3, Figure 7 and Figure 8, the lower end of the exhaust channel 209 is covered by the bare battery core 201, the exhaust port 208 is connected to the upper end of the exhaust channel 209, and the gas flows from the bare battery core 201 into the exhaust channel 209, and It flows from the exhaust port 208 located at the upper end of the exhaust passage 209 to the explosion-proof valve 102 . 3 and 4 , the side edges of the protruding portion 302 are retracted toward the exhaust port 208 relative to the side edges of the main body portion 301 to form the second escape groove 401 . Referring to FIG. 5 , the second escape groove 401 faces the corner 402 of the housing 101 . Referring to FIG. 5 , the corner 402 of the housing 101 refers to the fillet or chamfer at the connection between adjacent two side walls of the accommodation cavity 207 .

Referring to Figure 6, in some embodiments, the end cap assembly 103 has a resisting surface 501 at one end close to the explosion-proof valve 102 (for example, the resisting surface 501 is provided on the plastic part 504); combined with Figures 6 and 7, the resisting surface 501 resists the side of the exhaust channel member 203 facing the bare battery core 201 to prevent the exhaust channel member 203 from moving in a direction close to the bare battery core 201 .

In some usage scenarios of the battery 100, the explosion-proof valve 102 is set upward. Correspondingly, the exhaust channel member 203 has a tendency to move downward under its own gravity and approach the bare battery core 201; or, in some cases, When the battery 100 is hit, the casing 101 resists the exhaust channel member 203 and the exhaust channel member 203 tends to be close to the bare battery core 201 . In the case where the end cover assembly 103 is provided with a resisting surface 501, the resisting surface 501 can resist the exhaust channel member 203 and prevent the exhaust channel member 203 from moving in a direction closer to the bare battery core 201; this is beneficial to improving the exhaust gas. The positional stability of the channel member 203 ensures the stability of the exhaust, and can prevent the exhaust channel member 203 from excessively pressing the bare battery core 201, thereby reducing the risk of damage to the bare battery core 201.

Referring to Figure 6, in some embodiments, the end cap assembly 103 further includes a positioning body 502, which is disposed on the resisting surface 501 and protrudes relative to the resisting surface 501; combined with Figure 3, the exhaust channel member 203 The end has a positioning hole 304, and the positioning body 502 is inserted into the positioning hole 304 (the inserted state is shown in FIG. 7), thereby realizing the connection between the end cover assembly 103 and the exhaust channel member 203.

In the case where the positioning body 502 and the positioning hole 304 are provided, the exhaust channel member 203 can be stably and reliably fixed between the explosion-proof valve 102 and the bare battery core 201. The exhaust channel member 203 will not be displaced, and the explosion-proof valve 102 and the bare battery core 201 will not be displaced. The exhaust space between the bare cells 201 has higher stability and reliability, so the exhaust stability of the battery 100 is better. Moreover, compared with methods such as screwing and gluing, the arrangement of the positioning body 502 and the positioning hole 304 is conducive to improving the convenience of connecting the end cover assembly 103 and the exhaust channel member 203. Similarly, the positions of the positioning hole 304 and the positioning body 502 can be interchanged; in other embodiments, a portion of the resisting surface 501 can be recessed to form the positioning hole 304, and a portion of the end of the exhaust channel member 203 can be convex. Thus, the positioning body 502 is formed, and the positioning body 502 is inserted into the positioning hole 304 .

Referring to FIG. 11 , the end cap assembly 103 also has a liquid injection hole 1002 connected with the accommodation cavity 207 , and the liquid injection hole 1002 injects electrolyte into the accommodation cavity 207 . The battery 100 also includes a sealing member 1001, which is connected to the end cover assembly 103 (for example, the sealing member 1001 is welded to the cover plate 503), and the sealing member 1001 blocks the liquid injection hole 1002. After the electrolyte injection is completed, the seal 1001 can be used to seal the injection hole 1002 to prevent leakage of the electrolyte and prevent water, dust and other debris from entering the interior of the housing 101 through the injection hole 1002. If the explosion-proof valve 102 of the battery 100 needs to be upward when in use, then, as shown in FIG. 11 , the liquid injection hole 1002 can be provided at an end of the end cover assembly 103 close to the explosion-proof valve 102 to ensure that the liquid injection hole 1002 is in the Higher height, thereby reducing the risk of electrolyte leakage.

When the casing 101 is a conductor (for example, the casing 101 is made of metal), in order to prevent the bare battery core 201 from directly contacting the casing 101, which may cause performance degradation of the battery 100 and cause safety hazards, the battery 100 may also include internal insulation. Film 204, the inner insulating film 204 wraps the outer surface of the bare battery core 201. The inner insulating film 204 can be wrapped on the side of the bare battery core 201. For example, taking FIG. 2 as an example, the inner insulating film 204 wraps the left, right, upper and lower surfaces of the bare battery core 201; The front and rear ends may not be wrapped by the inner insulating film 204 so that the tabs 202 and the pole posts 104 are electrically connected and the electrolyte and the bare cell 201 are in contact with each other when the electrolyte is injected. Referring to Figure 2 or Figure 5, when the battery 100 includes multiple bare battery cells 201, the multiple bare battery cores 201 can be wrapped simultaneously by an inner insulating film 204 to save materials and improve the convenience of battery 100 production. In the case where the inner insulating film 204 is provided, the inner insulating film 204 separates the side of the bare cell 201 close to the explosion-proof valve 102 from the exhaust channel member 203 .

Referring to FIG. 8 , in order to facilitate the discharge of gas from the explosion-proof valve 102 , the inner insulating film 204 has an air hole 206 on the side close to the explosion-proof valve 102 . The air hole 206 communicates with the exhaust port 208. For example, with reference to FIGS. 3 and 8 , the air hole 206 communicates with the lower end of the exhaust channel 209 and thereby communicates with the exhaust port 208 located at the upper end of the exhaust channel 209. The gas generated from the bare battery core 201 can pass through the air hole 206 and the exhaust port 208 in sequence, and then flow to the explosion-proof valve 102 . Providing the air holes 206 is helpful to shorten the exhaust path of the gas and reduce the exhaust resistance to ensure that the gas is smoothly discharged through the explosion-proof valve 102 .

Similarly, referring to FIG. 11 , in order to meet the insulation requirements of the battery 100 , the battery 100 may further include an outer insulating film 1101 , and the outer insulating film 1101 is wrapped around the outer surface of the case 101 . The outer insulating film 1101 has a first escape hole 1106 through which the explosion-proof valve 102 is exposed and the gas discharged from the explosion-proof valve 102 can pass through the first escape hole 1106. A first escape hole 1106 is provided in the outer insulating film 1101 to prevent the outer insulating film 1101 from blocking the discharge of gas inside the housing 101 .

In addition, when the cover plate 503 of the end cover assembly 103 is a conductor (for example, the cover plate 503 is made of metal), the outer insulating film 1101 can also cover the appearance of the cover plate 503 of the end cover assembly 103 .

The general assembly process of the battery 100 will be introduced below. The inner insulating film 204 can be wrapped around the outside of the bare cell 201 first, and then the tabs 202 of the bare cell 201 are connected to the poles 104 of the end cap assembly 103 . After the connection between the tab 202 and the end cover assembly 103 is completed, place the exhaust channel piece 203 on the side of the bare battery core 201 that will face the explosion-proof valve 102; more specifically, the end of the exhaust channel piece 203 can be connected to the explosion-proof valve 102. The end cover assembly 103 is connected, for example, through the cooperation of the positioning body 502 and the positioning hole 304 mentioned above to realize the connection between the exhaust channel member 203 and the end cover assembly 103 . Next, the housing 101 with the explosion-proof valve 102 pre-installed is placed outside the bare battery core 201 and the exhaust channel member 203, and the end cover assembly 103 is connected to the housing 101; the end cover assembly 103 is connected to the housing 101 After completion, the electrolyte is injected into the interior of the housing 101 through the liquid injection hole 1002. After the liquid injection is completed, the liquid injection hole 1002 is blocked by the seal 1001. Finally, the outer insulating film 1101 covers the outer surfaces of the housing 101 and the cover 503 .

In the case where both ends of the housing 101 have openings 901 , the two end cover assemblies 103 are respectively disposed at two different openings 901 , and the two end cover assemblies 103 are electrically connected to both ends of the bare battery core 201 respectively. . The edge of the cover plate 503 of the end cover assembly 103 and the housing 101 may be connected by welding.

9 and 10 , in order to improve the assembly efficiency of the battery 100, in other embodiments, the two end cover assemblies 103 are electrically connected to both ends of the bare cell 201, but the housing 101 only has an opening 901 on one end. , and the other end of the housing 101 has a second escape hole 801 . Referring to Figures 9 and 10, both the opening 901 and the second escape hole 801 are connected to the accommodation cavity 207. The opening 901 is larger, and the opening 901 allows the bare battery core 201 and the exhaust channel member 203 to enter the accommodation cavity 207. One of the end caps The assembly 103 covers the opening 901 to close one end of the receiving cavity 207 . The second escape hole 801 is smaller, and the other end cover assembly 103 is penetrated with the second escape hole 801. More specifically, the pole 104 of the end cover assembly 103 is penetrated with the second escape hole 801, and the end cover assembly 103 is sealed. Block the second escape hole 801 to close the other end of the accommodation cavity 207 .

For example, with reference to FIGS. 2 , 9 and 10 , the rear end of the housing 101 has a second escape hole 801 , and the front end of the housing 101 has an opening 901 . If the whole combination of the bare battery core 201, the inner insulating film 204, the exhaust channel member 203 and the two end cover assemblies 103 is called an assembly, then the shell 101 is placed on the outside of the assembly, and the rear one is An end cap assembly 103 is basically accommodated in the accommodation cavity 207 of the housing 101 , with only its pole post 104 passing through the second escape hole 801 to the outside of the housing 101 . The front end cover assembly 103 covers the opening 901 , and the edge portion of the cover plate 503 of the end cover assembly 103 can be connected and fixed with the housing 101 . The rear end cap assembly 103 is resisted by the bare battery core 201 and the housing 101 from different sides to fix its position.

Therefore, when the two ends of the housing 101 have the opening 901 and the second escape hole 801 respectively, only the end cap assembly 103 for covering the opening 901 needs to be welded to the housing 101, and there is no need to weld the two The end cover components 103 are all welded to the casing 101; this can reduce one welding step, thereby helping to reduce the time required to assemble the battery 100 and improve the assembly efficiency of the battery 100.

It should be noted that if the two ends of the housing 101 have an opening 901 and a second escape hole 801 respectively, the liquid injection hole 1002 is required on the end cover assembly 103 used to cover the opening 901, and the other end cover assembly 103 needs There is no need to provide a liquid injection hole 1002.

As mentioned above, after the connection between the housing 101 and the end cover assembly 103 is completed, the outer insulating film 1101 needs to be covered. Referring to FIG. 12 , in order to improve the production efficiency of the battery 100 , the outer insulating film 1101 may include a plurality of separately arranged insulating parts, wherein at least one insulating part covers a plurality of adjacent outer surfaces of the case 101 .

For example, referring to FIG. 12 , in one embodiment, a total of four insulating parts are provided, namely a first insulating part 1102 , a second insulating part 1103 , a third insulating part 1104 and a fourth insulating part 1107 . The first insulating part 1102 can cover the left, lower and right surfaces of the casing 101 of the battery 100 , and the second insulating part 1103 is used to cover the upper surface of the casing 101 of the battery 100 . If both ends of the housing 101 have openings 901 , then the third insulating part 1104 and the fourth insulating part 1107 respectively cover the outer surfaces of the two cover plates 503 . If the two ends of the housing 101 have openings 901 and second escape holes 801 respectively, then the third insulating part 1104 can cover the appearance of the cover plate 503 of one of the end cover assemblies 103, and the fourth insulating part 1107 can cover the inside of the housing 101. One end surface (with reference to Figure 9, it covers the rear end surface of the housing 101).

Relative to each insulating part covering only one surface of the housing 101, the setting of "at least one insulating part can cover multiple surfaces of the housing 101" can reduce the total number of insulating parts; since the total number of insulating parts is reduced, "take The number of times of "film-film application" is reduced, which is beneficial to reducing the time required to cover the outer insulating film 1101 and improving the production efficiency of the battery 100.

In other embodiments, the outer insulating film 1101 may only include two insulating parts, one of which is the first insulating part 1102 shown in FIG. 12 , and the other insulating part is equivalent to the second insulating part 1103 in FIG. 12 , the third insulating part 1104 and the fourth insulating part 1107 are integrally formed. This can further reduce the total number of insulating parts, thereby improving the coating efficiency of the outer insulating film 1101 . The combination modes of the insulating portions of the outer insulating film 1101 are not listed here.

In addition, since the pole 104 needs to be electrically connected to conductive components (cables, conductive bars, etc.), the outer insulating film 1101 does not cover the pole 104. Correspondingly, the outer insulating film 1101 has a third avoidance for avoiding the outer insulating film 1101. hole 1105 (for example, the third insulating part 1104 and the fourth insulating part 1107 both have a third escape hole 1105), and the pole post 104 is inserted through the third escape hole 1105.

This application also provides a battery 100 module. The battery 100 module includes a module shell and a plurality of batteries 100 as described in any of the above embodiments. The batteries 100 are installed in the module shell. Multiple batteries 100 in the battery 100 module are arranged side by side. Taking FIG. 1 as an example, the multiple batteries 100 can be arranged in the left and right directions. The direction of the side of the battery 100 where the explosion-proof valve 102 is installed can be the same, so that the position where the gas is discharged from each battery 100 is located on the same side of the battery 100 module, which facilitates the collection of gas discharged from the battery 100 .

The embodiments of the present application have been described in detail above in conjunction with the accompanying drawings. However, the present application is not limited to the above-mentioned embodiments. Within the scope of knowledge possessed by those of ordinary skill in the art, various embodiments can be made without departing from the purpose of the present application. Variety. In addition, the embodiments of the present application and the features in the embodiments may be combined with each other without conflict.

Claims

Battery, characterized by including:

Bare cells;

A housing with an accommodation cavity inside, and the bare battery core is arranged in the accommodation cavity;

At least one end cover assembly, the end portion connected to the housing seals the accommodation cavity, and at least one end cover assembly is electrically connected to the bare cell;

An explosion-proof valve, installed on the side of the housing, the explosion-proof valve can be opened at a preset pressure to discharge the gas in the accommodation cavity;

An exhaust channel member is provided in the accommodation cavity and between the bare battery core and the explosion-proof valve. The exhaust channel member has an exhaust surface, and the exhaust surface is provided with an exhaust port. , the area of the exhaust port on the exhaust surface accounts for more than half of the area of the exhaust surface, and the exhaust port communicates with the explosion-proof valve and the accommodation cavity.
The battery according to claim 1, wherein the end cap assembly is connected to an end of the exhaust channel member, and the end of the exhaust channel member has a first escape groove, and the first escape groove is The groove is provided on the side of the exhaust channel member close to the explosion-proof valve. In the projection direction perpendicular to the end cover assembly, the explosion-proof valve is spaced apart from the first escape groove to form an escape channel.
The battery according to claim 1, wherein the exhaust channel member includes a main body and a raised portion, the main body has an exhaust channel, and the raised portion is connected to the main body and is close to the On one side of the explosion-proof valve, the end of the raised portion away from the main body has the exhaust surface and the exhaust port. The exhaust port is connected with the exhaust channel, and the raised portion faces the exhaust surface. A second relief groove is formed inwardly on the main body portion, and the second relief groove faces the corner of the housing.
The battery according to claim 1, wherein the end cover assembly has a resisting surface at one end close to the explosion-proof valve, and the resisting surface and the exhaust channel member face an end of the bare battery core. The side resists to prevent the exhaust channel member from moving in a direction close to the bare battery core.
The battery according to claim 4, wherein the end cover assembly includes a positioning body disposed on the resisting surface, an end of the exhaust channel member has a positioning hole, and the positioning body is inserted into in the positioning hole;

Alternatively, the resisting surface is recessed to form a positioning hole, and an end of the exhaust channel member is protruding to form a positioning body, and the positioning body is inserted into the positioning hole.
The battery according to claim 1, further comprising an inner insulating film wrapped around the outer surface of the bare battery core, the inner insulating film having air holes, and the air holes are connected to the The exhaust port is connected.
The battery according to claim 1, further comprising an outer insulating film wrapped around the outer surface of the housing, the outer insulating film having a first escape hole, the first escape hole Expose the explosion-proof valve.
The battery according to claim 7, wherein the outer insulating film includes a plurality of insulating parts, wherein at least one of the insulating parts covers a plurality of adjacent outer surfaces of the housing.
The battery according to claim 1, wherein one end of the housing has an opening, and the other end of the housing has a second escape hole, and the opening and the second escape hole are respectively connected with the accommodation hole. The cavity is connected, and the opening allows the bare battery core to enter the accommodation cavity. The number of the end cover assemblies is two. One end cover component is electrically connected to one end of the bare battery core and covers all the ends. The other end cover component is electrically connected to the other end of the bare battery core and passes through the second escape hole.
The battery module is characterized by including:

The battery according to any one of claims 1 to 9, wherein multiple batteries are provided;

Module shell, the battery is installed in the module shell.