Cover plate assembly and single battery

Abstract

The utility model belongs to the technical field of batteries, and discloses a cover plate assembly and a single battery. The cover plate assembly comprises a cover plate body and a plurality of liquid storage bins, the cover plate body is used for sealing a battery shell of a single battery, the cover plate body is provided with a control unit, and the control unit is used for detecting SOH of the single battery; the multiple liquid storage bins are arranged at the bottom of the cover plate body at intervals and located in the battery shell, the liquid storage bins are filled with electrolyte, valves are arranged on the outer walls of the liquid storage bins, and the interiors of the liquid storage bins and the interior of the battery shell can be communicated when the valves are opened; wherein the plurality of valves are respectively in communication connection with the control unit, and the control unit is used for gradually opening at least one of the plurality of valves. According to the cover plate assembly, the electrolyte can be supplemented into the single battery under the condition of ensuring the air tightness in the single battery, and the electrolyte can be supplemented in stages, so that the charge-discharge performance and the cycle life of the single battery are effectively improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field especially relates to a cover plate subassembly and single battery. BACKGROUND

[0002] In the whole life cycle charging and discharging use process of the battery, electrolyte solvent, electrolyte and active lithium ion, VC (Vinylene Carbonate, carbonic acid ethylene glycol vinyl ester) and other substances will be consumed along with the charging and discharging reaction, leading to the continuous decrease of electrolyte total amount and activity. When the SOH (State of Health, health state) of the battery is used to 80% SOH and below, the internal active substance of the battery has been basically consumed, and the total amount of free electrolyte is significantly reduced. At this time, it will cause the internal lithium ion transmission of the battery to be blocked, the lithium on the negative electrode surface to be precipitated, the charging and discharging efficiency to be reduced and other adverse effects. At this time, it can not be applied to traditional energy vehicles, but can only be used for energy storage system after recovery. When the SOH of the battery is reduced to 60% SOH and below, the service life will also be greatly reduced in the energy storage application scenario.

[0003] Currently, there are mainly two methods for the above problems: one is to appropriately increase the electrolyte injection amount in the battery manufacturing process, and to add enough active substances in the electrolyte. However, due to the limited internal space of the battery and the excessive injection amount, the capacity will be too large, which may increase other chemical reactions in the battery, cause the oxidation of the electrode surface, shorten the service life of the battery, and increase the manufacturing cost. The second method is to pry open the battery injection hole by artificial or machine when the battery is used to 80% SOH, and then manually inject electrolyte. However, this method is only applicable to battery monomers, and cannot be used for liquid supplementing operation when the battery is assembled into a battery module, a battery pack or a battery cluster. The injection operation of each battery monomer is low in efficiency and high in cost, and cannot guarantee the internal airtightness of the battery.

[0004] Therefore, it is urgent to provide a new cover plate subassembly and single battery to solve the above technical problems in the prior art. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a cover plate subassembly which can supplement electrolyte into the single battery under the condition of guaranteeing the internal airtightness of the single battery, and can supplement electrolyte in stages, effectively improving the charging and discharging performance and cycle life of the single battery.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] The cover plate assembly comprises a cover plate body and a plurality of liquid storage bins, the cover plate body is used for sealing a battery case of a single battery, the cover plate body is provided with a control unit, the control unit is used for detecting SOH of the single battery, the plurality of liquid storage bins are arranged at intervals at the bottom of the cover plate body and are located inside the battery case, the liquid storage bins are filled with electrolyte, the outer wall of the liquid storage bin is provided with a valve, and the valve can communicate the inside of the liquid storage bin with the inside of the battery case when the valve is opened; wherein, the valves are all connected in communication with the control unit, and the control unit is used for sequentially opening at least one of the plurality of valves.

[0008] Optionally, the control unit is arranged at the bottom of the cover plate body and is located inside the battery case.

[0009] Optionally, the control unit is electrically connected to the positive pole and the negative pole of the cover plate body.

[0010] Optionally, the control unit, the positive pole, the plurality of valves and the negative pole are sequentially connected in series.

[0011] Optionally, the SOH of the single battery comprises a first state, a second state and a third state, and the liquid storage bins are provided with three corresponding to the SOH of the single battery.

[0012] Optionally, the first state is 90% SOH, the second state is 80% SOH, and the third state is 70% SOH.

[0013] Optionally, the valve is arranged at the bottom of the liquid storage bin.

[0014] Optionally, the control unit is connected in communication with a BMS system, and the BMS system is used for detecting the SOH of the single battery.

[0015] Optionally, the electrolyte concentration in the liquid storage bin is greater than the electrolyte concentration in the single battery.

[0016] Another purpose of the utility model is to provide a single battery, which comprises the cover plate assembly of any one of the above-mentioned schemes.

[0017] Advantages:

[0018] The utility model discloses a cover plate assembly uses the battery shell of cover plate body sealed single battery, be provided with a plurality of interval arrangement's liquid storage bin at the bottom of cover plate body, and the liquid storage bin stores electrolyte, and the outer wall of liquid storage bin is provided with valve, is used for controlling the communication of liquid storage bin inside and battery shell inside, and the cover plate body still is equipped with control unit, and control unit is used for detecting the SOH of single battery, when the SOH of single battery reduces, and control unit detects the degree of reduction, thereby corresponding gradually opens at least one in above -mentioned valve, realizes the gradual, gradual supplement of a plurality of liquid storage bins to single battery inside electrolyte, and will not influence the original airtightness of single battery. The cover plate assembly can supplement electrolyte to single battery inside under the condition of guaranteeing single battery inside airtightness, and can supplement electrolyte in stages, effectively improves the charge-discharge performance and cycle life of single battery. BRIEF DESCRIPTION OF DRAWINGS

[0019] Fig. 1 It is the top view of the cover plate assembly provided by the utility model embodiment;

[0020] Fig. 2 It is the longitudinal section view of the cover plate assembly provided by the utility model embodiment;

[0021] Fig. 3 It is the bottom view of the cover plate assembly provided by the utility model embodiment.

[0022] In the drawing:

[0023] 100, cover plate body; 101, explosion-proof valve; 102, liquid injection hole; 103, positive pole; 104, negative pole; 105, code carving area; 110, control unit; 200, liquid storage bin; 210, valve. DETAILED DESCRIPTION

[0024] The utility model will be further explained in detail in combination with the drawings and examples. It can be understood that the specific examples described here are only used to explain the utility model, and not limited to the utility model. In addition, it should be noted that, in order to facilitate the description, only the part related to the utility model is shown in the drawing, not all the structures.

[0025] In the description of the utility model, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanical connection, or it can be electrical connection; it can be directly connected, or it can be indirectly connected through the intermediate medium, it can be the communication of two elements or the interaction relationship of two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0026] In the utility model, unless another definite provision and limitation, first feature is in second feature "on" or "under" can include that first and second features are in direct contact, also can include that first and second features are not in direct contact but contact through other feature between them. Moreover, first feature is on, above and on of second feature includes that first feature is directly above and obliquely above of second feature, or only indicates that the horizontal height of first feature is higher than second feature. First feature is under, below and under of second feature includes that first feature is directly below and obliquely below of second feature, or only indicates that the horizontal height of first feature is less than second feature.

[0027] In the description of the embodiment, the terms "upper", "lower", "right", "left", "horizontal", "vertical", and "radial" refer to the orientation or position of the device or element shown in the drawings, and are only used for convenience of description and simplification of operation, and do not indicate or imply that the device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0028] It should be noted that in the embodiment, SOH=(C-CEoL) / (CBoL-CEoL)*100%, wherein CEoL is the capacity value of the end-of-life time of the single battery, CBoL is the capacity value of the new single battery at the time of factory shipment, and C is the actual single battery capacity value at the current time.

[0029] Please refer to Figs. 1 to 3 The cover plate assembly includes a cover plate body 100 and a plurality of liquid storage bins 200. The cover plate body 100 is used to seal the battery shell of the single battery. The cover plate body 100 is provided with a control unit 110 for detecting the SOH of the single battery. The plurality of liquid storage bins 200 are arranged at the bottom of the cover plate body 100 and inside the battery shell. The liquid storage bins 200 are filled with electrolyte. The outer wall of the liquid storage bin 200 is provided with a valve 210. When the valve 210 is opened, the inside of the liquid storage bin 200 and the inside of the battery shell can be communicated. The plurality of valves 210 are respectively connected to the control unit 110. The control unit 110 is used to open at least one of the plurality of valves 210.

[0030] The cover plate assembly in the embodiment uses the cover plate body 100 to seal the battery shell of the single battery, a plurality of spaced liquid storage bins 200 are arranged at the bottom of the cover plate body 100, the liquid storage bins 200 store electrolyte, the outer wall of the liquid storage bin 200 is provided with a valve 210 for controlling the communication between the inside of the liquid storage bin 200 and the inside of the battery shell, and the cover plate body 100 is also provided with a control unit 110 for detecting the SOH of the single battery. When the SOH of the single battery decreases, the control unit 110 detects the degree of decrease, thereby sequentially opening at least one of the above-mentioned valves 210, realizing the sequential and phased supplement of the plurality of liquid storage bins 200 to the electrolyte inside the single battery, and without affecting the original airtightness of the single battery. The cover plate assembly can supplement the electrolyte in the single battery under the condition of ensuring the airtightness of the single battery, and can supplement the electrolyte in stages, effectively improving the charge-discharge performance and cycle life of the single battery.

[0031] Optionally, the SOH of the single battery includes a first state, a second state and a third state, and the liquid storage bin 200 is provided with three corresponding to the SOH of the single battery. The first liquid storage bin 200 is opened when the single battery reaches the first state, the second liquid storage bin 200 is opened when the single battery reaches the second state, and the third liquid storage bin 200 is opened when the single battery reaches the third state. It should be noted that the SOH of the single battery can be provided with more, such as the fourth state, the fifth state, etc., and each SOH is provided with a liquid storage bin 200. When the SOH of the battery decreases to a certain state, the control unit 110 detects and opens the valve 210 of the liquid storage bin 200, realizes the phased addition of electrolyte, and improves the service life and use reliability of the single battery.

[0032] Specifically, the first state in the embodiment is 90% SOH, the second state is 80% SOH, and the third state is 70% SOH. The above-mentioned state can realize the phased addition of electrolyte, and the above-mentioned three states are exemplary states in the embodiment. The skilled in the art can change the SOH value according to the use demand and use environment of the single battery, which will not be repeated here.

[0033] Further, the top wall surface of the cover plate body 100 is provided with a code carving area 105 for pasting, carving or etching a two-dimensional code. In the embodiment, two code carving areas 105 are arranged on the outer periphery of the explosion-proof valve 101 for traceability in automated production, facilitating management.

[0034] As Fig. 2As shown, the valve 210 is located at the bottom of the liquid storage tank 200. This valve 210 allows electrolyte to be added through the bottom of the liquid storage tank 200, and the electrolyte flows naturally into the individual battery cell using only gravity, eliminating the need for an additional drive mechanism and thus reducing the manufacturing cost of the cover assembly.

[0035] In this embodiment, the control unit 110 is communicatively connected to the BMS system (i.e., the Battery Management System of the battery pack), which is used to detect the State of Health (SOH) of the individual cells. Therefore, the SOH data of the individual cells detected by the battery pack's BMS system is transmitted to the control unit 110 without the need to add a detection mechanism to the control unit 110. This simplifies the structure of the control unit 110, reduces manufacturing costs, and further integrates the individual cells with the battery pack.

[0036] like Fig. 3 As shown, the control unit 110 is further disposed at the bottom of the cover body 100 and located inside the battery casing. This arrangement of the control unit 110 does not occupy the space of the original cover body 100, ensuring that the control unit 110 is located inside the individual battery cell and does not affect the installation and use of the individual battery cell using the cover assembly.

[0037] Specifically, the control unit 110 and multiple liquid storage tanks 200 are arranged around the outer periphery of the explosion-proof valve 101 on the cover body 100 and avoid the injection hole 102, so as to avoid affecting the original normal liquid injection and explosion-proof pressure relief functions of the single battery and improve the reliability of the single battery.

[0038] In this embodiment, multiple liquid storage tanks 200 are made of corrosion-resistant metal plates and are welded to the bottom wall of the aluminum cover plate body 100, which will not be described in detail here.

[0039] Optionally, the control unit 110 is electrically connected to the positive terminal 103 and the negative terminal 104 of the cover plate body 100. By electrically connecting the control unit 110 to the positive terminal 103 and the negative terminal 104, the control unit 110 can be powered without the need for additional external leads or power supply devices, thus simplifying its structure and further reducing costs.

[0040] Further, the control unit 110, the positive pole 103, the plurality of valves 210 and the negative pole 104 are connected in series. Thus, the control unit 110 and the plurality of valves 210 are powered by the single battery, which simplifies the structure of the cover assembly and reduces the production cost. It should be noted that when the control unit 110 is connected in series with the valves 210, only current passes through, and the control unit 110 is connected to the plurality of valves 210 by wireless transmission or data line for communication, so as to sequentially open the plurality of valves 210. Details are not described herein.

[0041] As a preferred embodiment, the electrolyte concentration in the liquid storage bin 200 is greater than the electrolyte concentration in the single battery. The electrolyte concentration in the liquid storage bin 200 is greater than the electrolyte concentration in the single battery, which can make the liquid storage bin 200 supplement more active lithium ions, VC and other active substances, so that the consumed electrolyte of the single battery is replenished to the original state as much as possible. Details are not described herein.

[0042] Further, the valves 210 of the plurality of liquid storage bins 200 are sequentially opened, and the electrolyte concentration in the liquid storage bin 200 can be sequentially increased, or the electrolyte capacity is sequentially increased, so as to supplement more electrolyte active substances at a lower single battery SOH, and further improve the use reliability and cycle life of the single battery.

[0043] The embodiment also provides a single battery including the cover assembly according to any one of the above-mentioned embodiments. The single battery can be a nickel-hydrogen battery, a nickel-cadmium battery, a lead-acid (or lead-acid) battery, a lithium-ion battery, a polymer lithium-ion battery, etc. The single battery can also be a lithium-ion primary battery, a lithium-sulfur battery, a sodium lithium-ion battery or a sodium-ion battery, or a magnesium-ion battery, etc. Details are not described herein. The single battery has the beneficial effects of the cover assembly according to any one of the above-mentioned embodiments. Details are not described herein.

[0044] Specifically, the single battery uses the cover assembly described above, which can supplement electrolyte into the single battery under the condition of ensuring the airtightness of the single battery, and can supplement electrolyte in stages, effectively improving the charge-discharge performance and cycle life of the single battery.

[0045] The embodiment also provides an electric device including the single battery according to the above-mentioned embodiments. The electric device can be an electric bicycle, an electric vehicle, a hybrid vehicle, a ship, an energy storage device, etc., as long as it uses electric energy as an energy source. Details are not described herein.

[0046] Obviously, the above embodiments of the present application are merely examples for clearly illustrating the present application, and are not intended to limit the implementation modes of the present application. For those skilled in the art, various obvious changes, re-adjustments and replacements can be made without departing from the protection scope of the present application. Here, it is not necessary and also impossible to enumerate all the implementation modes. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application claim.

Claims

1. A cover assembly, characterized by The application relates to a cover plate assembly for a single battery, which comprises: a cover plate body (100) for sealing a battery shell of a single battery, wherein the cover plate body (100) is provided with a control unit (110) for detecting the SOH of the single battery; a plurality of liquid storage compartments (200) which are arranged at the bottom of the cover plate body (100) and inside the battery shell, wherein the liquid storage compartments (200) are filled with electrolyte, and the outer wall of the liquid storage compartments (200) is provided with a valve (210) which can communicate the inside of the liquid storage compartments (200) with the inside of the battery shell when opened; wherein the valves (210) are all connected to the control unit (110), and the control unit (110) is used for sequentially opening at least one of the valves (210).

2. The cover plate assembly of claim 1, wherein, The control unit (110) is arranged at the bottom of the cover plate body (100) and inside the battery shell.

3. The cover plate assembly of claim 2, wherein, The control unit (110) is electrically connected to the positive pole column (103) and the negative pole column (104) of the cover plate body (100).

4. The cover plate assembly of claim 3, wherein, The control unit (110), the positive pole column (103), the plurality of valves (210) and the negative pole column (104) are sequentially connected in series.

5. The cover plate assembly of claim 1, wherein, The SOH of the single battery comprises a first state, a second state and a third state, and the liquid storage compartments (200) are one-to-one corresponding to the SOH of the single battery and are provided with three states.

6. The cover plate assembly of claim 5, wherein, The first state is 90% SOH, the second state is 80% SOH, and the third state is 70% SOH.

7. The cover plate assembly of any one of claims 1-6, wherein, The valve (210) is arranged at the bottom of the liquid storage compartment (200).

8. The cover plate assembly of any one of claims 1-6, wherein, The control unit (110) is connected to a BMS system, and the BMS system is used for detecting the SOH of the single battery.

9. The cover plate assembly of any one of claims 1-6, wherein, The electrolyte concentration in the liquid storage compartment (200) is greater than the electrolyte concentration in the single battery.

10. A single cell characterized by The application further relates to a cover plate assembly comprising any one of the cover plate assemblies according to claims 1-9.

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