CN106654113B

CN106654113B - Battery case with exhaust port and battery

Info

Publication number: CN106654113B
Application number: CN201611183093.1A
Authority: CN
Inventors: 许文
Original assignee: Senke Chuangneng Tianjin New Energy Technology Co ltd
Current assignee: Senke Chuangneng Tianjin New Energy Technology Co ltd
Priority date: 2016-12-20
Filing date: 2016-12-20
Publication date: 2023-04-18
Anticipated expiration: 2036-12-20
Also published as: CN106654113A

Abstract

The application discloses battery case includes: the shell forms a cavity for arranging the pole piece and the electrolyte, and is provided with an exhaust port communicated with the cavity; and a sealing member provided on the housing and configured to open the exhaust port by a pressure of the gas in the chamber and to seal the exhaust port after the exhaust is completed. Because in this application, can be with the gas escape in the cavity, consequently can solve effectively and lead to the great even problem that produces the deformation of casing atress because of the gaseous continuous accumulation in the cavity. The application also discloses a battery.

Description

Battery case with exhaust port and battery

Technical Field

The application relates to the technical field of batteries, in particular to a battery shell with an exhaust port and a battery comprising the battery shell.

Background

A battery refers to a device provided with an electrolyte and metal electrodes to generate electric current. There are various kinds of batteries, for example, zinc-nickel batteries, lead-acid batteries, lithium batteries, and the like.

Batteries typically include a battery case and a pole piece and electrolyte disposed in the battery case. Taking a zinc-nickel battery as an example, the zinc-nickel battery is generally mainly composed of zinc, nickel oxide, a potassium hydroxide solution with a mass concentration of 25% -30%, a diaphragm and the like. When the zinc-nickel battery works, chemical energy is converted into electric energy through chemical reaction among zinc, nickel oxide and potassium hydroxide. However, hydrogen gas is generated while chemical energy is converted into electric energy through a chemical reaction. After a long period of use, the gas pressure accumulated in the battery case gradually becomes large, possibly causing the battery case to swell.

Therefore, how to effectively solve the technical problem that the battery case is easy to swell during use is a technical problem to be solved by those skilled in the art.

Disclosure of Invention

The embodiment of the application provides a battery case, which is used for solving the problem that the battery case is easy to expand in the using process in the prior art.

The embodiment of the application also provides a battery, which is used for solving the problem that the battery shell is easy to expand in the using process in the prior art.

The embodiment of the application adopts the following technical scheme:

the battery case of the present application includes: the shell forms a cavity for arranging the pole piece and the electrolyte, and is provided with an exhaust port communicated with the cavity; a sealing member provided on the housing, configured to open the exhaust port by a pressure of the gas in the cavity, and to seal the exhaust port after the exhaust is completed.

Optionally, a fixing column with the exhaust port is arranged on the shell; the sealing element comprises a sealing cap sleeved on the outer side of the fixed column, wherein the side wall of the sealing cap moves towards the direction far away from the fixed column after being subjected to gas pressure so as to open the exhaust port, and moves towards the direction close to the fixed column after the exhaust is completed so as to seal the exhaust port.

Optionally, the sealing cap is an elastic sealing cap.

Optionally, an opening penetrating along the radial direction of the fixing column is formed in the side wall of the fixing column, and a pressing plate connected with the shell is arranged at the top of the sealing cap in a pressing mode.

Optionally, the pressing plate is disposed in the recessed area of the housing, and the pressing plate is disposed on the housing in a drawing manner.

Optionally, the fixing column is recessed, the lower surface of the pressing plate is attached to the upper surface of the shell, and an air passage for communicating the air outlet with the outside is formed in the shell.

Optionally, the air passage includes a first air passage portion connected to the air outlet and defined by a sidewall of the sealing cap and the fixing post, a second air passage portion connected to the first air passage portion and defined by a sidewall of the sealing cap and the housing, and a third air passage portion connected to the second air passage portion and defined by the housing and the pressure plate.

Optionally, a plurality of sub-cavities are arranged in the housing, and exhaust ports are arranged at positions of the housing corresponding to the sub-cavities, wherein the exhaust ports are partially communicated through the third air passage.

Optionally, the housing includes a box body forming the cavity and a cover body disposed on the box body, wherein the exhaust port is disposed on the cover body.

The battery comprises a battery shell, and a pole piece and an electrolyte which are arranged in the battery shell, wherein the battery shell is any one of the battery shells.

The embodiment of the application adopts at least one technical scheme which can achieve the following beneficial effects:

in the scheme that this application embodiment adopted, the battery case includes the casing that is equipped with the gas vent and sets up the sealing member on the casing. The exhaust port is communicated with a cavity for arranging the pole piece and the electrolyte, and the sealing element is used for sealing the exhaust port. When the gas pressure in the chamber becomes high, the sealing member opens the exhaust port under the gas pressure in the chamber, thereby allowing the gas in the chamber to be exhausted. When the exhaust is completed, the sealing element seals the exhaust port, thereby achieving sealing of the cavity. Because in this application, can be with the gas escape in the cavity, consequently can solve effectively and lead to the great even problem that produces the deformation of casing atress because of the gaseous continuous accumulation in the cavity.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:

fig. 1 is an exploded view of a housing provided in accordance with an embodiment of the present application;

fig. 2 is a schematic structural diagram of a pole piece arranged in a box body according to an embodiment of the present application;

fig. 3 is a schematic structural view of a sealing cap provided on a cover body according to an embodiment of the present disclosure;

fig. 4 is a schematic structural diagram of an outer surface of a cover according to an embodiment of the present disclosure;

FIG. 5 isbase:Sub>A cross-sectional view A-A of FIG. 4;

fig. 6 is a schematic internal side perspective structure view of a cover body according to an embodiment of the present application;

fig. 7 is a schematic view of an inner side plane structure of a cover body according to an embodiment of the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail and completely with reference to the following specific embodiments of the present application and the accompanying drawings. It should be apparent that the described embodiments are only a few embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

As shown in fig. 1 to 3, the battery case 100 of the present application includes a case 1 for forming a cavity 11 and a sealing member 15 disposed on the case 1. Wherein, the cavity 11 is provided with electrolyte and a pole piece 200. The case 1 is provided with a gas outlet 101 communicating with the cavity 11 to allow gas generated during the use of the battery to be discharged through the gas outlet 101, thereby reducing the possibility of the battery case 100 expanding by the pressure of the gas in the cavity 11.

The sealing member 15 is disposed at the position of the exhaust port 101 to seal the exhaust port 101 when exhaust is not required, thereby ensuring the sealing property of the chamber 11. When venting is required, the seal 15 opens the vent 101. To ensure that the gas in the chamber 11 can be effectively exhausted, the sealing member 15 may be configured to conduct the exhaust port 101 under the pressure of the gas in the chamber 11. Thus, not only can the gas in the cavity 11 be effectively discharged, but also the opening timing of the exhaust port 101 can be substantially matched with the gas pressure in the cavity 11, so as to reduce the possibility of expansion of the housing 1 caused by untimely opening of the exhaust port 101.

There are various arrangements of the exhaust port 101 and the sealing member 15, and the arrangement of the exhaust port 101 and the sealing member 15 will be described in detail below as an example.

As shown in fig. 1 and 4, the housing 1 may include a case 12 forming the cavity 11 and a cover 13 disposed on the case 12, and the exhaust port 101 may be disposed on the cover 13 to facilitate processing.

As shown in fig. 5 (wherein fig. 5 is a schematic illustration of the arrangement of the sealing cap 151, the cover 13 is only used for showing the position relationship with the sealing cap 151, and the outer shape of the cover 13 does not completely correspond to the outer shape of the cover 13 in fig. 4), the sealing member 15 may be a sealing cap 151 having a substantially barrel shape. The sealing cap 151 includes a substantially cylindrical side wall and a top wall provided at one end of the side wall. The sealing cap 151 may be an elastic sealing cap 151, and the material may be rubber or the like. So set up, sealing member 15's simple structure, with low costs, manufacturing is convenient.

The cover body 13 is provided with a fixing column 16, the fixing column 16 is provided with a through hole, and the through hole penetrates through the cover body 13 and is communicated with the cavity 11 so as to form an exhaust port 101 through the through hole in the fixing column 16. Like this, be convenient for establish the outside at fixed column 16 with sealing cap 151 cover to realize the sealed of gas vent 101, simple to operate, it is laborsaving to save trouble, and be convenient for realize moreover that gas vent 101 is opened to sealing cap 151 behind receiving gas pressure, sealed gas vent 101 after the exhaust.

In an example where the sealing cap 151 is pressurized by gas to open the exhaust port 101, and the exhaust port 101 is sealed after exhausting, an opening 161 (as shown in fig. 5) may be formed on a sidewall of the fixing post 16 to penetrate along a radial direction of the fixing post 16. Specifically, a notch may be formed at the upper end of the side wall of the fixing post 16 to facilitate processing. The pressing plate 121 is pressed on the top of the sealing cap 151.

When the gas pressure in the chamber 11 is greater than the sum of the deformation force of the sealing cap 151 and the atmospheric pressure, the sidewall of the sealing cap 151 moves away from the sidewall of the stationary post 16, so that a gap is formed between the sidewall of the sealing cap 151 and the sidewall of the stationary post 16, and the gas is discharged through the gap. After the exhaust is completed, the gas pressure in the cavity 11 is less than or equal to the sum of the deformation force of the sealing cap 151 and the atmospheric pressure, and the side wall of the sealing cap 151 moves towards the fixed column 16 until the side wall is attached to the fixed column 16, so as to seal the exhaust port 101. Through the above mode setting, the simple structure of fixed column 16 and sealing cap 151, convenient to use, it is small, be convenient for realize the exhaust and the sealed of cavity 11.

In the above example, the pressing plate 121 may be connected to the cover 13, and the pressing plate 121 may be disposed on the cover 13 in a drawing manner, so as to further simplify the structure. The pressing plate 121 is fixed by providing protrusions on both sides of the pressing plate 121 and providing a groove in the cover 13, and providing the protrusions in the groove in a push-pull manner.

The fixing post 16 may be recessed in the cover 13, and an upper end of the fixing post 16 is lower than an upper surface of the cover 13. Thus, after the pressing plate 121 is arranged, the lower surface of the pressing plate 121 can be attached to the upper surface of the cover 13, so that the pressing plate 121 is supported by the cover 13, and the service life of the pressing plate 121 is prolonged.

Further, the pressing plate 121 may be disposed in a recessed area 122 of the cover 13, that is, the portion of the cover 13 for disposing the pressing plate 121 is the recessed area 122. When the pressing plate 121 is provided on the lid body 13 in this way, the upper surface of the other region of the lid body 13 can be made flush with the upper surface of the pressing plate 121, so that the appearance of the lid body 13 can be improved, and the possibility that the pressing plate 121 is easily damaged due to the pressing plate 121 protruding from the lid body 13 can be reduced.

When the fixing post 16 is recessed in the cover 13 and the pressing plate 121 is attached to the cover 13, an air duct 17 (shown in fig. 4) needs to be provided on the cover 13 so that the air discharged from the air outlet 101 can flow out. In one example, as shown in fig. 1, 4 and 5, the air path 17 includes a first air path portion 171 defined by the sidewall of the sealing cap 151 and the fixing post 16, a second air path portion 172 defined by the sidewall of the sealing cap 151 and the cover body 13, and a third air path portion 173 defined by the cover body 13 and the pressing plate 121. The first air path portion 171 is connected to the exhaust port 101, the second air path portion 172 is connected to the first air path portion 171, and the third air path portion 173 is connected to the second air path portion 172 and the outside.

Here, in order to facilitate the formation of the first and second

air path portions

171 and 172, a distance between the sidewall of the fixing post 16 and the cover body 13 may be approximately twice a thickness of the sidewall of the sealing cap 151. In addition, the sidewall of the sealing cap 151 may not be provided with a hole, and a gap may be left between the bottom end of the sealing cap 151 and the cover body 13 to facilitate the processing of the sealing cap 151.

The chamber 11 may be divided into a plurality of sub-chambers 111 by the partition board 14, and each sub-chamber 111 may be correspondingly provided with one exhaust port 101, that is, the cover 13 is provided with an exhaust port 101 at a position corresponding to each sub-chamber 111. Each of the exhaust ports 101 may be provided in the above-described manner, and the exhaust ports 101 may communicate through the third air path portion 173. Thus, a third air channel part 173 communicated with the outside can be arranged between the pressing plate 121 and the cover body 13, so that the processing is convenient, and the trouble and the labor are saved.

Of course, the above-described embodiments are merely exemplary. In other embodiments of the present application, the exhaust port may not be disposed on the cover, or the housing may be disposed in other manners. In other embodiments of the application, the sealing element can also be a plug with a spring, when the gas pressure of the cavity borne by the plug is greater than the pressure of the spring, the plug opens the exhaust port, and when the gas pressure of the cavity borne by the plug is less than the pressure of the spring, the plug blocks the exhaust port. In other embodiments of the present application, the fixing column may also protrude from the housing.

The battery of the present application includes a battery case 100 and a pole piece 200, an electrolyte, disposed in the battery case 100. Wherein the battery case 100 may be the battery case 100 described above. In the battery of the present application, when the gas pressure in the chamber 11 becomes high, the sealing member 15 opens the gas discharge port 101 under the gas pressure in the chamber 11, thereby allowing the gas in the chamber 11 to be discharged. When the evacuation is completed, the sealing member 15 seals the evacuation port 101, thereby achieving sealing of the chamber 11. In the battery, the gas in the cavity 11 can be exhausted, so that the problem that the stress of the shell 1 is large and even the shell is deformed due to continuous accumulation of the gas in the cavity 11 can be effectively solved.

The battery can be a zinc-nickel battery, a lead-acid battery, a lithium battery and the like. The structure of the zinc-nickel battery provided with the battery case 100 will be described in detail below, taking a zinc-nickel battery as an example.

As shown in fig. 1 and 2, the zinc-nickel battery includes a battery case 100, and a pole piece 200 and an electrolyte disposed in the battery case 100. The tab 200 includes a positive tab with a positive tab 21 and a negative tab with a negative tab 22. The battery case 100 has a rectangular parallelepiped shape and includes a case 12 defining a cavity 11 and a lid 13 fastened to the case 12. The case 12 is provided with a plurality of partitions 14 for partitioning the chamber 11 into a plurality of sub-chambers 111 having a substantially rectangular parallelepiped shape.

A plurality of positive electrode tabs and a plurality of negative electrode tabs may be provided in each sub-cavity 111. The positive plate and the negative plate are unfolded in a planar state, and are arranged at intervals in the same sub-cavity 111. So set up, simple structure, compact structure, zinc-nickel battery's volume is less.

The positive tab 21 and the negative tab 22 in the same sub-cavity 111 are welded to the positive tab 21 and the negative tab 22 respectively, so that the connection is convenient and a certain voltage can be formed. The material of the positive tab 21 and the material of the negative tab 22 may both be nickel, so as to reduce the damage to the

tabs

21 and 22 caused by welding. The lengths of positive tab 21 and negative tab 22 may be selected as desired, and may be, for example, 10-15 cm.

The positive tab 21 and the negative tab 22 in different sub-cavities 111 are welded for convenient connection, and the pole pieces 200 in different sub-cavities 111 can be connected in series, and the total voltage of the zinc-nickel battery is the sum of the voltages of the sub-cavities 111 at the moment, so as to increase the voltage of the zinc-nickel battery, and the zinc-nickel battery can be applied to an electric vehicle and the like.

In one example, eight sub-cavities 111 are provided in the case 12, and eleven negative electrodes and ten positive electrodes are provided in each sub-cavity 111. The voltage developed in each sub-chamber 111 was 1.65V, and the total voltage of the zinc-nickel battery was 13.2V. The voltage of 13.2V is closer to the voltage of 12V required by the electric vehicle, and the electric vehicle can be well powered.

A gap is left between separator 14 and the top wall of cover 13 to allow positive tab 21 and negative tab 22 located in different sub-cavities 111 to contact and be welded together. As shown in fig. 6 and 7, in order to improve the connection firmness of the tabs between the sub-cavities 111, the cover body 13 may be provided with a receiving groove 123 for receiving the tab, so as to play a certain clamping role for the tab through the receiving groove 123, thereby reducing the possibility of reducing the connection firmness of the tab due to the welding or the large number of sub-cavities 111.

The cover 13 may protrude outward to form the receiving groove 123, or a protruding edge 124 extending toward the partition 14 may be disposed on the cover 13, so that the receiving groove 123 is formed by the protruding edge 124. Preferably, the receiving groove 123 is formed by the protruding edge 124, so that the upper surface of the cover 13 is substantially planar, and the appearance of the housing 1 is improved. The structure of the protruding edge 124 will be described in detail below by taking the case that the protruding edge 124 forms the receiving groove 123.

The protruding edge 124 partially overlaps the partition 14 in the upper-to-lower direction of the chamber 11. Thus, when the tab is disposed in the accommodation groove 123, the tab may be supported by the separator 14, so that the stability of the tab may be further improved. The overlapping length of the protruding edge 124 and the partition 14 along the upper to lower direction of the cavity 11 can be specifically set as required. In one example, the overlapping length of the protruding edge 124 and the separator 14 is between 2 mm and 5mm, so that the tab can be supported by the separator 14 and the space of the receiving groove 123 can be secured.

The protruding edge 124 may be disposed in various ways, for example, the protruding edge 124 may be a rectangular parallelepiped shape surrounding the side wall of the receiving groove 123, and the partition 14 is provided with a gap. When the cover 13 is fastened to the box 12, the protruding edge 124 passes through the notch. For another example, the protruding edge 124 may also be an annular protruding edge 124 surrounding along the sidewall of the sub-cavity 111, and two annular protruding edges 124 located at two sides of the partition 14 form the receiving groove 123.

Preferably, the receiving groove 123 is formed by an annular convex edge 124 surrounding the sidewall of the sub-cavity 111. Thus, the annular ledge 124 may be equally long at each location along the upper to lower direction of the cavity 11. When the cover 13 is fastened to the case 12, the annular protruding edge 124 and the partition 14 are partially overlapped, so that the possibility of noise generation or unstable voltage caused by the electrolyte flowing between the sub-chambers 111 can be effectively reduced.

The annular convex edge portion constituting the receiving groove 123 may be bent in a direction away from the partition plate 14. While other annular ledge portions may be closer to the separator 14 to engage the separator 14 to effectively reduce the likelihood of electrolyte flow between the sub-chambers 111.

Typically, positive tab 21 and negative tab 22 in one sub-cavity 111 are not connected to positive tab 21 and negative tab 22 in the same sub-cavity 111 at the same time. In other words, in pole piece 200 of middle sub-cavity 111, positive tab 21 is connected to negative tab 22 in the previous sub-cavity 111, and negative tab 22 is connected to positive tab 21 in the next sub-cavity 111. Therefore, one receiving groove 123 may be disposed between two adjacent annular rims 124.

Either the positive tab 21 or the negative tab 22 may be located approximately at the edge of the tab 200 to reduce the effect of the positive tab 21 and the negative tab 22 on each other. At this time, the exhaust port 101 may be located approximately at the middle of each sub-chamber 111, and the accommodation groove 123 is located approximately at the end of the sub-chamber 111.

In addition, as shown in fig. 2 and 3, a connection terminal 19 may be further provided on the cover 13 to facilitate connection of the zinc-nickel battery to other devices. The connection terminal 19 includes a fixing portion 191 connected to the connection post 18 and a connection portion 192 for connecting to an external device, and a connection hole may be formed in the connection portion 192 to facilitate connection of the external device to the connection terminal 19. The connecting portion 192 may protrude from the upper surface of the cover 13 and be substantially parallel to the cover 13 to reduce the possibility of deformation of the connecting portion 192.

The connection terminal 19 can be fixed to the cover 13 via a connection post 18 and can be electrically connected to the tab via the connection post 18. In one example, the tab is welded to the connection post 18, the connection post 18 is threaded, and the cover 13 is provided with a through hole 125 (shown in fig. 4) for receiving the connection post 18. When the connection terminal 19 is required to be arranged, the connection post 18 is inspected from the through hole 125, the fixing portion 191 of the connection terminal 19 is sleeved on the connection post 18, and the connection terminal 19 is pressed by a nut.

The fixing portion 191 may be partially disposed in the groove 126 of the cover 13 (as shown in fig. 4) to reduce the possibility that the nut protrudes from the groove 126 and is easily loosened. In this case, the through hole 125 may be disposed at an end of the groove 126 close to the exhaust port 101, or may be disposed at an end of the groove 126 far from the exhaust port 101.

Since the positive electrode and the negative electrode need to be drawn out of the zinc-nickel battery, the lid 13 needs to be provided with a positive electrode connection terminal and a negative electrode connection terminal. The positive connecting terminal and the negative connecting terminal can be connected with the positive lug and the negative lug through corresponding connecting columns. The positive connection terminal and the negative connection terminal may be provided at opposite ends of the cover 13.

The above are merely examples of the present application and are not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. A battery case, comprising:

the shell forms a cavity for arranging the pole piece and the electrolyte, and an exhaust port communicated with the cavity is formed in the shell;

a sealing member provided on the housing, configured to open the exhaust port by a pressure of the gas in the cavity, and seal the exhaust port after the exhaust is completed;

the shell comprises a box body forming a cavity and a cover body arranged on the box body, and the exhaust port is arranged on the cover body;

the sealing element is a sealing cap which is approximately barrel-shaped, the sealing cap comprises an approximately cylindrical side wall and a top wall arranged at one end of the side wall, and a gap is reserved between the bottom end of the sealing cap and the cover body;

a fixed column is arranged on the cover body, a through hole is formed in the fixed column, the through hole penetrates through the cover body and is communicated with the cavity, so that an exhaust port can be formed by the through hole in the fixed column, and a sealing cap is sleeved on the outer side of the fixed column, so that the exhaust port is sealed;

when the gas pressure in the cavity is greater than the sum of the deformation force of the sealing cap and the atmospheric pressure, the side wall of the sealing cap moves towards the direction far away from the side wall of the fixed column, so that a gap is formed between the side wall of the sealing cap and the side wall of the fixed column, and the gas is discharged from the gap; after the exhaust is finished, the gas pressure in the cavity is smaller than or equal to the sum of the deformation force of the sealing cap and the atmospheric pressure, the side wall of the sealing cap moves towards the fixed column until the side wall is attached to the fixed column, and the exhaust port is sealed;

the fixed columns are arranged in the cover body in a concave mode, the pressing plate is attached to the cover body, the air channel comprises a first air channel part defined by the side wall of the sealing cap and the fixed columns, a second air channel part defined by the side wall of the sealing cap and the cover body, and a third air channel part defined by the cover body and the pressing plate; the first air passage part is connected with the exhaust port, the second air passage part is connected with the first air passage part, and the third air passage part is connected with the second air passage part and the outside.

2. The battery case of claim 1, wherein the sealing cap is an elastomeric sealing cap.

3. The battery shell according to claim 1, wherein the side wall of the fixing post is provided with an opening penetrating along the radial direction of the fixing post, and the top of the sealing cap is pressed on a pressing plate connected with the shell.

4. The battery case of claim 3, wherein the pressure plate is disposed in a recessed area of the case, and the pressure plate is disposed on the case in a drawn manner.

5. The battery case according to claim 1, wherein a plurality of sub-cavities are provided in the case, and a gas exhaust port is provided at a position of the case corresponding to each sub-cavity, wherein each gas exhaust port is communicated with the third gas duct portion.

6. A battery comprising a battery case and a pole piece, electrolyte disposed in the battery case, wherein the battery case is the battery case of any one of claims 1 to 5.