CN203166035U

CN203166035U - Battery pack system

Info

Publication number: CN203166035U
Application number: CN2013200258550U
Authority: CN
Inventors: 杨从明
Original assignee: Microvast Power Systems Huzhou Co Ltd
Current assignee: Microvast Power Systems Huzhou Co Ltd
Priority date: 2013-01-17
Filing date: 2013-01-17
Publication date: 2013-08-28
Anticipated expiration: 2023-01-17

Abstract

The utility model relates to a battery pack system which a plurality of cells, a sealing fluid and a battery case for containing the sealing fluid, wherein the cells are soaked in the sealing fluid; the battery case is composed of a case body and a cover plate; the case body is provided with a sealing fluid outlet and a sealing fluid inlet; the outlet is connected with the inlet through a circulating pump and a buffer tank to form a circulating path; a detecting unit is arranged in the buffer tank; and when leakage occurs to the cells, the electrolyte mixed in the sealing fluid can be detected by the detecting unit when the sealing fluid flows through the buffer tank, and the detecting unit sends out a feedback signal. By adopting the scheme provided by the utility model, the leaking electrolyte is sealed in the flame-retardant sealing fluid, thereby avoiding the danger of combustion when the electrolyte contacts air; and the utility model can immediately detect a rupture of the cells in the battery case and set out a warning, thereby enhancing the safety of the battery case body.

Description

Battery pack system

Technical field

The utility model relates to a kind of battery pack system, especially a kind of battery pack system that can detect battery leakage.

Background technology

The electric automobile that current battery drives, electronic big bus be progressively traditional automobile and the bus of replacement.Battery cell is the main energy storage device on the electric automobile, and battery case is the critical component of electric automobile as the device that loads battery cell, thereby the performance that directly influences battery cell influences the performance of electric automobile.Lithium-ion-power cell is because of advantages such as its excellent power out-put characteristic and life-span length, and lithium-ion-power cell obtains good application in electric automobile at present.

Battery cell is as energy storage device main on the electric automobile, generally form by a plurality of battery strings are in parallel, lithium ion battery is in charging process, aprotic solvent in the electrolyte can react at electrode and electrolyte interface, these reactions form the passivation film that covers on the electrode surface on the one hand, can produce hydrogen simultaneously, hydro carbons, carbon monoxide, gases such as carbon dioxide, these gases can cause inner pressure of battery to raise, the inflatable problem appears, have a strong impact on the performance (cycle performance of battery and the security performance of battery) of battery, after the gas in the cell body is accumulated to a certain degree, the packaging material of battery cell break, the imflammable gas that leaks can be full of the entire cell case, if it is long-time that this process continued, the sealing that the gas in the battery case can break through battery case finally destroys Battery case, thereby makes air enter in the battery case, the imflammable gas that runs in the battery case is very easily caused danger, even blasts.

The utility model content

The purpose of this utility model provides a kind of perfect heat-dissipating, battery pack system that level of security is high.

For reaching above-mentioned purpose, the utility model provides a kind of battery pack system, comprise battery cell, confining liquid and comprise the battery case of confining liquid, battery cell is immersed in the confining liquid, battery case comprises casing and cover plate, battery cell is connected with external circuit by relay, confining liquid outlet and confining liquid entrance are set on the casing, the confining liquid outlet is joined together to form path by circulation canal and confining liquid entrance, surge tank and circulating pump also are set on the circulation canal, detection part is set in the surge tank.

Surge tank is a kind of device that gas can be separated from confining liquid, and surge tank separates gas and collects from confining liquid.

As preferably, on the described surge tank one-way exhaust valve is set;

When the gas in the surge tank is collected to a certain degree, open one-way exhaust valve, the air scavenge of collecting is gone out.

As preferably, described confining liquid is selected from one or both among silicone oil and the transformer oil;

More stable fire resistance and insulation property make these two kinds of materials become preferred material, between casing and cover plate seal gasket are set, and are conducive to increase the seal of casing.

As preferably, described detection part is selected from a kind of among pressure sensor, hydrogen gas sensor, hydrocarbon sensor, the carbon dioxide sensor or several;

The gas of collecting in the surge tank can cause certain interior pressure, and the pressure sensor interior gas of perception surge tank is exactly built up situation; Hydrogen gas sensor, hydrocarbon sensor and carbon dioxide sensor can detect the gas componant in the surge tank exactly, feed back reliable testing result.

As preferably, described battery cell is that electrode tip is towards the bottom surface upside down; Can effectively save the consumption of confining liquid, also can satisfy the demand of heat radiation and sealing electric component simultaneously.

As preferably, described battery case bottom arranges bracing frame, built on stilts battery cell; Make the lug of battery cell not contact battery case bottom surface and not supported and be pressed onto, make battery pack be inverted when arranging fixing more reliable.

As preferably, described battery cell comprises several sheet battery cells, and between per two sheet battery cells an isolated part is arranged; Isolated part is set is conducive to separate the circulation that battery cell increases confining liquid, make that the gas that leaks is easier of circulation line circulates away.

As preferably, described isolated part is not at grade the mesh grid of warp and parallel; Space between the battery cell that mesh grid separates is bigger, the easier liquid communication that makes, and warp is line vertical on the isolated part, parallel is line horizontal on the isolated part.

As preferably, between described battery case casing and the cover plate seal gasket is set; Secluding air reduces air to the influence of all parts in the battery case.

After the scheme that employing the utility model provides, the electrolyte that spills can be enclosed in the right confining liquid of resistance, prevent that electrolyte from contacting with air, avoids taking place danger of combustion, the imflammable gas that leaks out separates from circulation line and discharges, and presses excessive in avoiding and bursts battery case; Battery is upside down in the battery case, and the confining liquid demand is few, strengthens cooling effect, saves cost, alleviates the weight of power brick; Detect in the very first time whether battery cell has leakage in the battery case, and give a warning, improve the fail safe of Battery case.

Description of drawings

Fig. 1 is the battery pack schematic diagram.

Fig. 2 is the battery case explosive view.

Fig. 3 is that battery cell is in conjunction with the structural representation of bracing frame.

Fig. 4 is the battery case end view that loads battery cell.

Fig. 5 is that battery cell is in conjunction with the isolated part schematic diagram.

Wherein, 1, battery cell, 11, electrode, 2, confining liquid, 3, battery case, 31, cover plate, 32, casing, 33, seal gasket, 34, the confining liquid outlet, 35, confining liquid entrance, 4, surge tank, 5, detection part, 6, isolated part, 7, circulating pump, 8, circulation canal, 9, bracing frame, 91, the strong point.

Embodiment

Below in conjunction with accompanying drawing, embodiment of the present utility model is elaborated.

As Fig. 1-shown in Figure 5, battery case 3 is made up of casing 32 and cover plate 31, uses seal gasket 33 to act as gap between seal case 32 and the cover plate 31 between casing 32 and the cover plate 31, can be effectively with the parts secluding air in the casing 32.Be placed with the sheet battery in the casing 32, several sheet batteries are stacked mutually and form a battery cell 1, isolated part 6 of clamping between adjacent per two battery cells 1, isolated part 6 uses a mesh grid in this programme, be a kind of adopt graticule not in the plastics knitmesh on a plane as isolated part 6, it can well separate battery cell 1, and can accelerate the circulation of confining liquid 2, making that electrolyte is easier is passed in the confining liquid 2, gauze fabric also can be used as isolated part 6, but can influence the insulating capacity of whole system, and easily corroded by electrolyte, effect is also bad, uses the mesh grid of other excellent insulation performance also passable, the relay that connects external circuit is placed in the confining liquid 2, and confining liquid 2 is for possessing the silicone oil of stable fire resistance and insulation property.

11 covers of electrode upper support frame 9 at battery cell 1, on four angles on the bracing frame 9 strong point 91 is set, back-off is gone in the battery case 3 then, this moment, the electrode 11 of battery cell 1 was placed down, bracing frame 9 supports entire cell monomer 1, the strong point 91 directly contacts the bottom of battery case 3, and the silicone oil in the case can pass from the space of bracing frame 9.

Two sides of battery case 3 have two holes, confining liquid outlet 34 and confining liquid entrance 35, use circulation canal 8 that two mouths are connected into a path, be provided with surge tank 4 on the path, be provided with hydrogen gas sensor in the surge tank 4, battery case 3, surge tank 4 and circulation canal 8 are total systems of a sealing, confining liquid 2 circulates in this path, hydrogen in the battery pack is brought in the surge tank 4, surge tank 4 collects the hydrogen of sneaking in the circulation canal 8, and detect by hydrogen gas sensor, this system can detect battery cell 1 leakage hydrogen gas when helping the battery pack heat radiation.

Claims

1. battery pack system, comprise battery cell, confining liquid and comprise the battery case of confining liquid, battery cell is immersed in the confining liquid, battery case comprises casing and cover plate, battery cell is connected with external circuit by relay, it is characterized in that: confining liquid outlet and confining liquid entrance are set on the casing, and the confining liquid outlet is joined together to form path by circulation canal and confining liquid entrance, surge tank and circulating pump also are set on the circulation canal, detection part is set in the surge tank.

2. battery pack system according to claim 1 is characterized in that: on the described surge tank one-way exhaust valve is set.

3. battery pack system according to claim 1 is characterized in that: described confining liquid is selected from one or both among silicone oil and the transformer oil.

4. battery pack system according to claim 1 is characterized in that: described detection part is selected from a kind of among pressure sensor, hydrogen gas sensor, hydrocarbon sensor, the carbon dioxide sensor or several.

5. battery pack system according to claim 1, it is characterized in that: described battery cell is upside down.

6. battery pack system according to claim 1 or 5, it is characterized in that: described battery case bottom arranges bracing frame, built on stilts battery cell.

7. battery pack system according to claim 1 or 5, it is characterized in that: described battery cell comprises several sheet battery cells, and between per two sheet battery cells an isolated part is arranged.

8. battery pack system according to claim 7 is characterized in that: described isolated part is not at grade the mesh grid of warp and parallel.

9. battery pack system according to claim 1 is characterized in that: between described battery case casing and the cover plate seal gasket is set.