One-way valve group, cover plate assembly and battery

Abstract

The utility model discloses a one-way valve bank, cover plate subassembly and battery, the one-way valve bank is used for the battery, the one-way valve bank includes a plurality of one-way valves, the plurality of one-way valves are distributed in sequence, the previous one-way valve is connected with the latter one-way valve, each one-way valve is provided with a fluid channel, and the fluid channel is communicated with the fluid channel. The fluid flowing directions of the one-way valves are the same, the first one of the multiple one-way valves is communicated with the interior of the battery, and the pressure resistance value of the previous one-way valve is larger than that of the next one-way valve. According to the one-way valve set, one-way exhaust can be achieved, and meanwhile external air or moisture is prevented from entering the battery through opening and closing of the valves with different pressure-resistant gradients.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and more specifically, to a one-way valve group, a cover plate assembly and a battery. Background Art

[0002] With the increasingly wide range of applications of batteries, the safety requirements for batteries are also getting higher and higher. To ensure the safety of batteries during use, an explosion-proof valve device is usually provided on the top cover. When the internal pressure of the battery exceeds the pressure resistance limit of the explosion-proof valve, the explosion-proof valve breaks open, and the internal gas is discharged from the explosion-proof valve, reducing the internal pressure of the battery, thereby avoiding the explosion of the battery. However, there is currently no solution to the problem of gas generation during the cyclic charge and discharge of batteries during use.

[0003] For example, secondary batteries (lithium / sodium ion batteries) are widely used in various fields due to their good charge and discharge performance, wide operating temperature range and long service life. During the use of lithium / sodium secondary batteries, with continuous charge and discharge cycles, the electrolyte will be continuously consumed during the ion reaction process. Along with the change of the voltage of the positive and negative electrode plates, the electrolyte tends to be oxidized / reduced on the surface of the highly de-lithiated positive electrode / fully lithiated negative electrode, resulting in gas generation. The generation of gas inside the battery may cause the battery to expand and deform, affecting the performance and safety of the battery.

[0004] The currently common safety measures are to seal the injection port with a sealing nail or a steel ball, and use the explosion-proof valve as a pressure relief structure to ensure safe use. However, the explosion-proof valve can only take effect under a large pressure. When gas is generated in the battery during use but the pressure is small, it cannot be recognized and processed in time, resulting in pressure accumulation and having an adverse effect on the battery. On the one hand, the generated gas will cause an increase in the internal air pressure of the battery, thereby increasing the internal pressure of the battery. When the pressure is too high, it will cause the battery to expand and deform, resulting in damage or even explosion of the battery. On the other hand, if the gas cannot be discharged in time after generation, it will cause blockage inside the battery, affecting the normal operation of the battery and even resulting in a decline in battery performance. Summary of the Utility Model

[0005] An object of the utility model is to provide a one-way valve group, which can at least solve the technical problem of gas generation inside the battery in the prior art.

[0006] Another object of the utility model is to provide a cover plate assembly including the above-mentioned one-way valve group.

[0007] A further object of the utility model is to provide a battery including the above-mentioned one-way valve group or cover plate assembly.

[0008] To achieve the above objects, the utility model provides the following technical solutions.

[0009] According to the check valve group of the first aspect embodiment of the present utility model, the check valve group is used for a battery. The check valve group includes a plurality of check valves, and the plurality of check valves are distributed in sequence. The previous check valve is connected to the next check valve. Each check valve has a fluid passage, and the fluid flow directions of each check valve are the same. The first one of the plurality of check valves is communicated with the inside of the battery, and the pressure resistance value of the previous check valve is greater than that of the next check valve.

[0010] Optionally, two adjacent check valves are directly connected as a whole or connected as a whole through a connecting pipe.

[0011] Optionally, the last one of the plurality of check valves is communicated with the outside.

[0012] Optionally, the check valve includes: a housing; a valve, the valve is installed in the housing; a spring, the spring is located in the housing and connected to the valve, and the spring drives the valve to open when being squeezed and contracted.

[0013] Optionally, the check valve group further includes: a connecting member, the connecting member has a communicating passage, one end of the connecting member is connected to the first check valve, and the other end of the connecting member can be connected to the outer shell of the battery so that the gas inside the battery flows into the fluid passage of the first check valve through the communicating passage.

[0014] According to the cover plate assembly of the second aspect embodiment of the present utility model, the cover plate assembly is used for a battery. The cover plate assembly includes: a cover plate, and a first through hole is provided on the cover plate; a check valve group, the check valve group is arranged on the cover plate, and the fluid passage of the first check valve is communicated with the first through hole, and the check valve group is the check valve group according to any one of the above.

[0015] Optionally, the first through hole is a liquid injection port.

[0016] Optionally, a second through hole is further provided on the cover plate, and the cover plate assembly further includes: an explosion-proof valve, and the explosion-proof valve is arranged in the second through hole.

[0017] Optionally, the pressure resistance value of the explosion-proof valve is greater than that of the first check valve.

[0018] According to the battery of the third aspect embodiment of the present utility model, it includes the cover plate assembly according to any one of the above, or the check valve group according to any one of the above.

[0019] According to the embodiments of the present utility model, the one-way valve group is combined with multiple one-way valves, which can achieve one-way exhaust and avoid the entry of external air or moisture into the battery by opening and closing valves with different pressure resistance gradients. Moreover, when a certain pressure is generated inside the battery, the valve opens, thereby achieving the effect of pressure relief and exhaust, and reducing the accumulation of internal pressure. In addition, the gas generated during the cycle is discharged through the one-way valve, reducing the risk that the accumulation of internal gas causes the battery to expand and deform, and even affects its performance.

[0020] Other features and advantages of the present utility model will become clear from the following detailed description of the exemplary embodiments of the present utility model with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings incorporated in and forming a part of this specification illustrate embodiments of the present utility model and, together with the description, are used to explain the principles of the present utility model.

[0022] Figure 1 is a top view of a cover plate assembly according to an embodiment of the present utility model;

[0023] Figure 2 is a side view of a cover plate assembly at an angle according to an embodiment of the present utility model;

[0024] Figure 3 is a side view of a cover plate assembly at another angle according to an embodiment of the present utility model;

[0025] Figure 4 is a partial sectional view of a cover plate assembly according to an embodiment of the present utility model.

[0026] REFERENCE NUMERALS IN THE DRAWINGS

[0027] Cover plate assembly 100;

[0028] One-way valve group 1;

[0029] First one-way valve 11; First channel 111;

[0030] Second one-way valve 12; Second channel 121;

[0031] Shell 131; Spring 132;

[0032] Connector 14;

[0033] Cover plate 2; First through hole 21;

[0034] Explosion-proof valve 3;

[0035] Terminal post 200. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0036] Various exemplary embodiments of the present utility model will now be described in detail with reference to the accompanying drawings. It should be noted that: unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present utility model.

[0037] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way a limitation on the present utility model or its application or use.

[0038] Techniques, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be regarded as part of the specification.

[0039] In all the examples shown and discussed herein, any specific values should be construed as merely exemplary and not as limitations. Thus, other examples of the exemplary embodiments may have different values.

[0040] It should be noted that: like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, further discussion thereof in subsequent drawings is not required.

[0041] The one-way valve group 1 according to an embodiment of the present utility model will be specifically described below with reference to the accompanying drawings.

[0042] As Figures 1 to 4 shown, the one-way valve group 1 according to an embodiment of the present utility model is used for a battery, and the one-way valve group 1 includes a plurality of one-way valves.

[0043] Specifically, the plurality of one-way valves are distributed in sequence, the previous one-way valve is connected to the subsequent one-way valve, each one-way valve has a fluid passage, and the fluid flow directions of each one-way valve are the same. The first one of the plurality of one-way valves is in communication with the inside of the battery, and the pressure resistance value of the previous one-way valve is greater than that of the subsequent one-way valve.

[0044] In other words, the one-way valve group 1 according to an embodiment of the present utility model can be used for a battery and can be, for example, a part of the battery. The battery can be a single-cell battery, a secondary battery, etc. For example, the battery is a square aluminum-shell secondary battery, and the one-way valve group 1 is installed on the cover plate 2 of the battery.

[0045] Among them, the plurality of one-way valves are distributed in sequence, and the previous one-way valve is connected to the subsequent one-way valve. This connection can be a direct connection or an indirect connection. In this embodiment, the one-way valve group 1 can include two or more one-way valves and can be formed by combining a plurality of one-way valves.

[0046] Moreover, each check valve has a fluid passage, and the fluid flow direction of each check valve is the same. The first one of the multiple check valves is in communication with the interior of the battery. Through the cooperation of the multiple check valves, the gas inside the battery can be led out to the outside of the battery. In addition, the pressure resistance value of the previous check valve is greater than that of the subsequent check valve. For example, the pressure resistance value of the first check valve 11 is greater than that of the second check valve 12, and the second check valve 12 is greater than the third pressure resistance value, and so on. The pressure resistance value of the (N - 1)th check valve is greater than that of the Nth check valve. The check valve group 1 of this embodiment can not only achieve unidirectional exhaust, but also avoid the entry of external air or moisture into the battery by the opening and closing of valves with different pressure gradients.

[0047] For example, the first check valve 11 has a first passage 111. One end of the first passage 111 is in communication with the interior of the battery. The second check valve 12 has a second passage 121. The second check valve 12 is connected to the first check valve 11, and the pressure resistance value of the first check valve 11 is greater than that of the second check valve 12. Among them, when the first check valve 11 is opened, the gas inside the battery can flow into the first passage 111. When the second check valve 12 is opened, the gas in the first passage 111 flows into the second passage 121.

[0048] That is to say, a first passage 111 is defined inside the first check valve 11. When the first check valve 11 is opened, the first check valve 11 can allow fluid to flow in one direction. Similarly, a second passage 121 is defined inside the second check valve 12. When the second check valve 12 is opened, the second check valve 12 can allow fluid to flow in one direction. Moreover, the fluid flow directions inside the first check valve 11 and the second check valve 12 are the same.

[0049] It can be understood that the second check valve 12 is connected to the first check valve 11, which can be either directly connected or indirectly connected, and is not limited here. Among them, when the first check valve 11 is opened, the gas inside the battery can flow into the first passage 111; when the second check valve 12 is opened, the gas in the first passage 111 flows into the second passage 121. Also, since the first check valve 11 is in communication with the interior of the battery, the gas inside the battery pushes open the first check valve 11 and then enters the first passage 111, and then pushes open the second check valve 12 and enters the second passage 121. In addition, the pressure resistance value of the first check valve 11 is greater than that of the second check valve 12. Among them, the second check valve 12 is in communication with the outside world and has a slightly lower pressure resistance value, which is convenient for exhausting gas to the outside world. For example, the pressure resistance value of the second check valve 12 is set to 0.15 Mpa - 0.3 Mpa, and the first check valve 11 can be set to 0.3 Mpa - 0.5 Mpa.

[0050] In addition, it should be noted that since the pressure resistance value of the valve of the rear one-way valve is smaller, lower than the pressure resistance value of the front one-way valve, usually when the valve of the rear one-way valve is opened, the valve of the front one-way valve is in a closed state, so external gas will not enter the battery through the one-way valve group 1.

[0051] Therefore, the one-way valve group 1 according to the embodiment of the utility model can achieve one-way exhaust by cooperating with multiple one-way valves, and at the same time, prevent external air or moisture from entering the battery by opening and closing valves with different pressure resistance gradients. Moreover, when a certain pressure is generated inside the battery, the valve opens, thereby achieving the effect of pressure relief and exhaust, reducing internal pressure accumulation. In addition, the one-way valve is used to remove the gas generated during the cycle, reducing the risk of internal gas accumulation causing battery expansion and deformation, and even affecting performance.

[0052] According to one embodiment of the utility model, two adjacent one-way valves are directly connected as a whole, or are connected as a whole through a connecting pipe. For example, the first one-way valve 11 and the second one-way valve 12 are directly connected as a whole, or are connected as a whole through a connecting pipe. In other words, the first one-way valve 11 and the second one-way valve 12 can be directly connected, or indirectly connected through a connecting pipe, and the connection methods are various. Optionally, the connecting pipe can be made of rubber or corrosion-resistant plastic hose, etc., which is easy to connect and bend. Optionally, the connecting pipe can be 5mm-50mm, which can be suitable for batteries of various sizes.

[0053] In some specific embodiments of the present invention, the last one of the plurality of one-way valves is connected to the outside world. For example, the second one-way valve 12 is connected to the outside world, that is, after the gas pushes open the second one-way valve 12, the gas in the second channel 121 can flow out to the outside world.

[0054] According to one embodiment of the utility model, the one-way valve includes a housing 131, a valve and a spring 132. The valve is installed in the housing 131. The spring 132 is located in the housing 131 and is connected to the valve. The spring 132 drives the valve to open when squeezed and contracted. That is to say, when in use, the one-way valve can be opened or closed by pushing the spring 132 with gas. For example, the spring 132 can be used to control the pressure of the valve opening. When the internal pressure of the battery exceeds the pressure of the spring 132 on the valve, the spring 132 contracts after being squeezed, the valve opens, the gas is discharged, the internal pressure of the battery gradually decreases, the spring 132 recovers, and the valve closes.

[0055] In this embodiment, the opening of the one-way valve can be controlled by the spring 132. During the cycling of the battery, gas generation causes the internal pressure to continuously increase. When the pressure value is greater than the pressure resistance of the first one-way valve, the spring is squeezed and contracts, thereby opening the valve. The gas inside the battery enters the fluid passage of the first one-way valve or the connecting pipe connecting the first one-way valve and the next one-way valve. As the gas pressure gradually accumulates, when it reaches the pressure resistance value, the spring is also compressed, thereby opening the valve of the next one-way valve, and so on, until the gas is finally discharged. In addition, the pressure resistance value of the one-way valve can be controlled by different spring elastic coefficients of the spring 132.

[0056] Optionally, the housing can be an aluminum tube with a pile cap-like structure, and the valve can include a pressing piece. By using pure aluminum or aluminum alloy materials, it has advantages such as corrosion resistance.

[0057] In some specific embodiments of the present invention, the one-way valve group 1 further includes: a connector 14. The connector 14 has a communication channel. One end of the connector 14 is connected to the first one-way valve. That is to say, one end of the connector 14 is connected to the first one-way valve 11. The other end of the connector 14 can be connected to the outer shell of the battery, so that the gas inside the battery flows into the fluid passage of the first one-way valve through the communication channel, for example, into the first channel 111. That is to say, the first one-way valve 11 can be connected to the outer shell of the battery through the connector 14, improving the assembly convenience. Optionally, the connector 14 can be independent of the first one-way valve or can form an integral structure with the one-way valve, and can be set according to requirements, with strong flexibility. Optionally, the connector 14 can be a threaded structure or a pipe structure, etc. For example, the first one-way valve 11 is screwed tightly with the liquid injection port or riveted and fixed to the cover plate 2 through a pipe.

[0058] The present invention also provides a cover plate assembly 100 for a battery. The cover plate assembly 100 includes: a cover plate 2 and a one-way valve group 1. The cover plate 2 is provided with a first through hole 21. The one-way valve group 1 is arranged on the cover plate 2. The fluid passage of the first one-way valve is communicated with the first through hole 21. For example, the first channel 111 is communicated with the first through hole 21. The one-way valve group 1 is the one-way valve group 1 according to any of the above embodiments. Since the one-way valve group 1 has advantages such as high safety performance, the cover plate 2 of the embodiment of the present invention also has the same advantages, which will not be elaborated here.

[0059] According to an embodiment of the present utility model, the first through hole 21 is a liquid injection port. That is to say, a liquid injection port can be provided on the cover plate 2, and the first one-way valve 11 can be directly or indirectly installed at the position of the liquid injection port. During installation, after the battery is filled with electrolyte, a one-way valve group 1 can be added at the position of the liquid injection port. In this embodiment, by adding the one-way valve group 1 at the liquid injection port, the gas inside the battery can be discharged unidirectionally under a certain pressure, and at the same time, the combination of valves with different pressure resistance gradients can prevent external moisture or air from entering the battery due to untimely closing of the valves or loosening and air leakage of a single valve during the exhaust process, thereby having an adverse impact on the battery.

[0060] In some specific embodiments of the present utility model, the cover plate 2 is further provided with a second through hole, and the cover plate assembly 100 further includes: an explosion-proof valve 3, and the explosion-proof valve 3 is arranged in the second through hole. That is to say, not only the one-way valve group 1 is provided on the cover plate 2, but also the explosion-proof valve 3 is provided. For example, the cover plate 2 is strip-shaped, and the one-way valve group 1 and the explosion-proof valve 3 are spaced apart along the length direction of the cover plate 2. In this embodiment, the use of the explosion-proof valve 3 can improve the safety performance.

[0061] Optionally, the cover plate 2 can also be provided with a pole column 200. For example, pole columns 200, a one-way valve group 1, an explosion-proof valve 3, pole columns 200, etc. are sequentially distributed along the length direction of the cover plate 2. Optionally, along the thickness direction of the cover plate 2, the height of the one-way valve group 1 can be adjusted according to the actual situation. When it does not exceed the height of the pole column 200, it can avoid affecting the height dimension of the battery and the battery packaging. For example, the one-way valve group 1 is located above the cover plate 2, and the pipe diameter h of the one-way valve can be adjusted according to the actual situation, for example, 1 cm - 5 cm is adopted.

[0062] According to an embodiment of the present utility model, the pressure resistance value of the explosion-proof valve 3 is greater than that of the first one-way valve, that is to say, greater than the pressure resistance value of the first one-way valve 11. That is to say, the pressure resistance value of the explosion-proof valve 3 is greater than that of the first one-way valve 11, and the pressure resistance value of the first one-way valve 11 is greater than that of the second one-way valve 12. In this embodiment, by using the pressure resistance value of the explosion-proof valve 3 being greater than that of the first one-way valve, when the gas blows open the first one-way valve, it does not affect the explosion-proof valve 3, and the battery can still operate to a certain extent.

[0063] In summary, the cover plate assembly 100 according to the embodiment of the present utility model includes the one-way valve group 1 in any of the above embodiments. Since the one-way valve group 1 has the function of unidirectionally discharging the gas inside the battery and preventing external moisture and air from entering the battery, the cover plate assembly 100 according to the embodiment of the present utility model also has the same advantages. For example, adding the one-way valve group 1 at the liquid injection port can avoid the internal gas production of the battery and the influence of external moisture on the battery performance.

[0064] The present utility model also provides a battery, which includes the cover plate assembly 100 of any one of the above embodiments, or the one-way valve group 1 of any one of the above embodiments. The battery of the embodiment of the present utility model has advantages such as high safety performance, which will not be elaborated here.

[0065] Although some specific embodiments of the present utility model have been described in detail by way of examples, those skilled in the art should understand that the above examples are only for illustration and not for limiting the scope of the present utility model. Those skilled in the art should understand that the above embodiments can be modified without departing from the scope and spirit of the present utility model. The scope of the present utility model is defined by the appended claims.

Claims

1. A one-way valve group (1), characterized in that, The one-way valve group (1) is used for a battery. The one-way valve group (1) includes a plurality of one-way valves which are distributed in sequence. The previous one-way valve is connected to the next one-way valve. Each one-way valve has a fluid passage, and the fluid flow directions of each one-way valve are the same. The first one of the plurality of one-way valves is communicated with the inside of the battery, and the pressure resistance value of the previous one-way valve is greater than that of the next one-way valve.

2. The one-way valve group (1) according to claim 1, characterized in that, Two adjacent one-way valves are directly connected as a whole or connected as a whole through a connecting pipe.

3. The one-way valve group (1) according to claim 1, characterized in that, The last one of the plurality of one-way valves is communicated with the outside.

4. The one-way valve group (1) according to claim 1, characterized in that, The one-way valve includes: A housing (131); A valve which is installed in the housing (131); A spring (132) which is located in the housing (131) and connected to the valve. When the spring (132) is squeezed and contracted, it drives the valve to open.

5. The one-way valve group (1) according to claim 1, characterized in that, It further includes: A connector (14) which has a communication passage. One end of the connector (14) is connected to the first one-way valve, and the other end of the connector (14) can be connected to the outer shell of the battery so that the gas inside the battery flows into the fluid passage of the first one-way valve through the communication passage.

6. A cover plate assembly (100), characterized in that, The cover plate assembly (100) is used for a battery. The cover plate assembly (100) includes: A cover plate (2) which is provided with a first through hole (21); A one-way valve group (1) which is arranged on the cover plate (2). The fluid passage of the first one-way valve is communicated with the first through hole (21). The one-way valve group (1) is the one-way valve group (1) according to any one of claims 1-5.

7. The cover plate assembly (100) according to claim 6, wherein, The first through hole (21) is a liquid injection port.

8. The cover plate assembly (100) according to claim 6, characterized in that, The cover plate (2) is further provided with a second through hole. The cover plate assembly (100) further includes: An explosion-proof valve (3) which is arranged in the second through hole.

9. The cover plate assembly (100) according to claim 8, characterized in that, The pressure resistance value of the explosion-proof valve (3) is greater than that of the first one-way valve.

10. A battery, characterized in that, It includes the cover plate assembly (100) according to any one of claims 6-9, or the one-way valve group (1) according to any one of claims 1-5.

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