CN218215552U - Power battery and new energy electric car thereof - Google Patents

Abstract

The utility model discloses a power battery and new forms of energy trolley-bus thereof, power battery include electric core and casing assembly, and casing assembly is including the cavity that is used for holding electric core, and electric core setting is equipped with capillary structure in order to have phase transition characteristic in the cavity, casing assembly as soaking plate contact electric core in the casing assembly. Directly replacing battery plastic-aluminum shell through the casing subassembly, can effectively reducing the thermal resistance of solid fixed contact surface, make the more direct casing subassembly transmission as the soaking board of passing through of heat go out, the local high temperature of efficient reduction battery more to through form sealed space and can fill the liquid phase in the casing subassembly, capillary structure sets up inside sealed space, thereby make the gas-liquid circulation can go on repeatedly, maintain the continuation of heat transfer.

Description

Power battery and new forms of energy trolley-bus thereof

Technical Field

The utility model relates to a power battery technical field, in particular to power battery and new forms of energy trolley-bus thereof.

Background

The battery self thermal conductivity is low, the condition that the heat in the battery cannot be conducted out in time exists, and when the battery is thermally out of control, the battery is locally heated seriously, so that the battery can react out of control until burning and firing. Therefore, the safety of the existing power battery cannot be met, and the battery of the electric vehicle frequently generates smoke, fire and even explosion accidents.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve one of the technical problem that exists among the prior art at least. Therefore, the utility model provides a power battery can carry out the heat management all regionally through the technique of phase transition heat transfer to the battery.

The utility model discloses still provide a new forms of energy trolley-bus including above-mentioned power battery.

According to the utility model discloses power battery of first aspect embodiment includes:

an electric core;

the shell assembly comprises a cavity for accommodating the battery cell, the battery cell is arranged in the cavity, a capillary structure is arranged in the shell assembly so as to have phase change characteristics, and the shell assembly is contacted with the battery cell as a soaking plate.

According to the utility model discloses a power battery of first aspect embodiment has following beneficial effect at least: directly replacing battery plastic-aluminum shell through the casing subassembly, can effectively reducing the thermal resistance of solid fixed contact surface, make the more direct casing subassembly transmission as the soaking board of passing through of heat go out, the local high temperature of efficient reduction battery more to through form sealed space and can fill the liquid phase in the casing subassembly, capillary structure sets up inside sealed space, thereby make the gas-liquid circulation can go on repeatedly, maintain the continuation of heat transfer.

According to the power battery provided by the embodiment of the first aspect of the present invention, the casing assembly includes an inner casing member and an outer casing member, the inner casing member has the cavity for accommodating the battery cell, the outer casing member is wrapped and disposed on the periphery of the inner casing member, a sealing space is defined between the outer casing member and the inner casing member, and a plurality of grooves are disposed on the inner casing member to form an air passage structure in the sealing space; the capillary structure is a liquid absorption core which is arranged on the shell component so as to directly radiate and equalize the temperature of the battery core in the sealed space.

According to the utility model discloses a power battery of first aspect embodiment, the slot includes vertical slot and multidirectional slot, each vertical slot is arranged each lateral wall of inner shell part, each multidirectional slot sets up the bottom of inner shell part, multidirectional slot as working medium pond with each vertical slot intercommunication.

According to the power battery of the first aspect embodiment of the utility model, each longitudinal groove follows the length direction interval of inner shell part sets up, and some multidirectional slot follows the width direction of inner shell part sets up, and some multidirectional slot follows the thickness direction of inner shell part, each multidirectional slot communicates each other.

According to the utility model discloses a power battery of first aspect embodiment, vertical slot or at least one of multidirectional slot adopts the mode machine-shaping of punching press, extrusion or multiaspect sculpture.

According to the utility model discloses a power battery of first aspect embodiment, the top of inner shell part is equipped with the flange structure, the inner shell part passes through the flange structure with shell part welded connection, the bottom of inner shell part with the bottom of shell part passes through welded connection.

According to the power battery of the embodiment of the first aspect of the present invention, the material of the inner shell component and the outer shell component is copper or aluminum, and the thickness is 0.1-1 mm.

According to the utility model discloses a power battery of first aspect embodiment, power battery's lateral wall thickness size is 0.2 ~ 2mm, and overall thermal conductivity > 1000W/(K m).

According to the utility model discloses a power battery of first aspect embodiment, the imbibition core is silk screen or braided bag, the imbibition core with the surface of shell part closely laminates.

According to the utility model discloses new forms of energy trolley-bus of second aspect embodiment includes: the power battery according to the embodiment of the first aspect of the present invention.

It is easy to understand, the new energy electric car in the embodiment of the second aspect of the present invention has the technical effects of the power battery in the embodiment of the first aspect as described above, and therefore is not described in detail.

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

Drawings

The present invention will be further described with reference to the accompanying drawings and examples;

fig. 1 is a schematic structural diagram of an embodiment of the present invention;

fig. 2 is an exploded view of an embodiment of the present invention.

Reference numerals:

the shell component 1, the inner shell component 2, the liquid absorption core 3 and the groove 4.

Detailed Description

Reference will now be made in detail to the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary only for explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it should be understood that the orientation or positional relationship indicated with respect to the orientation description, such as up, down, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, a plurality of means are one or more, a plurality of means are at least two, and the terms greater than, less than, more than, etc. are understood as excluding the number, and the terms above, below, within, etc. are understood as including the number. If there is a description of first and second for the purpose of distinguishing technical features only, this is not to be understood as indicating or implying a relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of technical features indicated.

In the description of the present invention, unless there is an explicit limitation, the terms such as setting, installing, connecting, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meaning of the terms in the present invention by combining the specific contents of the technical solution.

Referring to fig. 1 to 2, the power battery according to the embodiment of the first aspect of the present invention is applied to a power battery, and the power battery includes an electrical core and a housing assembly.

The shell assembly comprises a cavity for accommodating the battery cell, the battery cell is arranged in the cavity, a capillary structure is arranged in the shell assembly so as to have phase change characteristics, and the shell assembly is in contact with the battery cell as a soaking plate. Directly replacing battery plastic-aluminum shell through casing assembly, can effectively reducing the thermal resistance of solid fixed contact surface, make the more direct casing assembly who passes through as the soaking plate of heat transfer away, the local high temperature of more efficient reduction battery to through form confined space and can fill the liquid phase in casing assembly, capillary structure sets up inside confined space, thereby makes the gas-liquid circulation can repeat, maintains the continuation of conducting heat.

In some embodiments of the present invention, the housing assembly includes an inner housing part 2 and an outer housing part 1, wherein the inner housing part 2 has a cavity for accommodating the battery cell, the outer housing part 1 is wrapped around the inner housing part 2, and a sealed space is defined between the outer housing part 1 and the inner housing part 2; it can be understood that the inner wall of the inner shell 2 encloses a cavity for wrapping the battery cell, the outer wall of the inner shell 2 encloses a side wall of the sealed space with the inner wall of the outer shell 1, and the bottom and the top of the inner shell 2 and the top of the outer shell 1 are respectively tightly connected to form two ends of the matched sealed space. Wherein each groove 4 is arranged on the inner shell part 2 to be used as an air channel structure in the sealed space; wherein the wick 3 is provided on the housing member 1 to directly dissipate heat and equalize temperature of the cell in the sealed space. Through inner shell part 2 and the direct battery plastic-aluminum shell that replaces of housing part 1, can effectively reduce the thermal resistance of solid fixed contact surface, make more direct inner shell part 2 and the transmission of housing part 1 of passing through as the soaking pit of heat, the local high temperature of more efficient reduction battery, and through form confined space and can fill the liquid phase between outer shell part 1 and inner shell part 2, imbibition core 3 sets up inside confined space, slot 4 is as the air flue structure, take away the heat through liquid evaporation and condensation, and realize the liquid backward flow through imbibition core 3, thereby make the gas-liquid circulation can repeat, the continuation of heat transfer is maintained.

It can be understood that when the battery is overcharged and overdischarged, even when more dangerous conditions such as extrusion occur, the technology of phase change heat transfer to conduct heat management on all regions of the battery is a reliable solution for solving the extreme thermal runaway of the battery. Phase change heat transfer component is like the soaking plate, carries out efficient heat transfer through liquid vapour phase transition latent heat in the vacuum cavity, takes away the heat through liquid evaporation and condensation, and realize the liquid backward flow through capillary wick, thereby make the gas-liquid circulation can go on repeatedly, maintain the continuation of heat transfer, but the application of soaking plate technique in the battery field, mainly concentrate on for the soaking cooling on battery surface, common generally pastes the soaking plate on the battery surface, avoid the battery local high temperature to appear and lead to the thermal runaway situation. However, the latex of the battery can reduce the quality and energy density of the battery module, and the soaking plate cannot directly contact the battery core, so that the thermal control efficiency is reduced, and the thermal management requirement may not be met in the case of extreme conditions.

Therefore in some embodiments of the utility model, inner shell part 2 and shell part 1 are the soaking cooling on battery surface as the soaking board, and the phase transition heat transfer casing adopts and strengthens through capillary property, has phase transition characteristic's shell formula soaking board, utilizes ultra-thin soaking board technique to replace the aluminum-plastic shell of battery electricity core into ultra-thin soaking board shell, makes battery and soaking board direct contact, directly to inside electricity core structure heat dissipation and samming, realizes power battery's high-efficient heat management.

In some embodiments of the present invention, the grooves 4 include longitudinal grooves and multidirectional grooves, each longitudinal groove is disposed on each side wall of the inner housing member 2, each multidirectional groove is disposed on the bottom of the inner housing member 2, and the multidirectional grooves communicate with each longitudinal groove as a working medium pool. It can be understood that the top of the inner shell 2 is used to connect tightly with the outer shell 1, and then the longitudinal grooves are uniformly distributed on each side of the inner shell 2, and the multi-directional grooves are distributed on the bottom of the inner shell 2, and the multi-directional grooves penetrate through each side of the inner shell 2 along the multi-direction, so that the longitudinal grooves are communicated with the multi-directional grooves, and the liquid phase filled in the sealed space can flow, thereby ensuring the uniformity and rapidness of the liquid backflow.

Preferably, the longitudinal grooves are arranged at intervals along the length direction of the inner housing part 2, part of the multi-directional grooves are arranged along the width direction of the inner housing part 2, part of the multi-directional grooves are arranged along the thickness direction of the inner housing part 2, and the multi-directional grooves are communicated with each other. The multi-directional grooves are arranged at the bottom of the shell to be bidirectional grooves which face to the front and back and the left and right, are communicated with the longitudinal grooves of the side wall and serve as working medium pools to provide working medium transmission for the side wall.

In some embodiments of the present invention, the longitudinal groove is a rectangular groove, the width is 6mm, the top width is 5mm, and the depth is 0.2mm. At least one of the longitudinal grooves or the multi-directional grooves is processed and formed by stamping, extruding or multi-surface etching.

In some embodiments of the present invention, the top end of the inner shell 2 is provided with a flange structure, the inner shell 2 is welded to the outer shell 1 through the flange structure, and the bottom of the inner shell 2 is welded to the bottom of the outer shell 1. Wherein the welded connection of the inner shell part 2 to the outer shell part 1 can be realized by a soldered connection. Specifically, the top of the groove 4 of the four side walls in the inner shell part 2 is provided with a flange structure which is used as a support structure to be tightly connected with the four side walls of the outer shell part 1, one end of a silk screen is clamped and fixed in the middle, the rest part of the silk screen is tightly attached to the outer shell part 1, and the bottom of the inner shell part 2 is connected with the bottom of the outer shell part 1 through welding. The top flange of the inner shell part 2 is parallel to the bottom of the inner shell part 2, the width dimension of the outer edge of the flange is consistent with that of the outer shell part 1, and the flange is connected with the top of the outer shell part 1 through welding through the lower surface.

In some embodiments of the present invention, the wick 3 is a micro-structure having super-hydrophilic characteristics such as a wire mesh or woven bag, in some embodiments, the wick 3 is formed by sintering a wire mesh having a thickness of 0.1mm as a single layer, and after the wick 3 is tightly attached to the surface of the housing member 1, the wire mesh is fixed to the inner housing member 2 and the housing member 1 while being connected by welding.

In some embodiments of the present invention, the material of the inner shell member 2 and the outer shell member 1 is copper or aluminum, the thickness is 0.1-1 mm, that is, the thickness of the outer shell member 1 is 0.1mm, the thickness of the inner shell member 2 is 0.1mm, and the shell shape is formed by stamping. In some embodiments, the power cell has a sidewall thickness dimension of 0.2 to 2mm and an overall thermal conductivity > 1000W/(K · m). Specifically, the overall size of the power battery is 90X 150X 15mm, and the thickness of the side wall of the shell is 0.5mm.

Referring to fig. 1-2, the utility model discloses power battery's manufacturing approach of second aspect embodiment can be used to make the utility model discloses power battery of first aspect embodiment realizes the combination of ultra-thin soaking plate and battery plastic-aluminum shell, makes battery and soaking plate direct contact, realizes power battery's high-efficient heat management.

The manufacturing method of the power battery comprises the following steps:

pressing two thin aluminum plates into an outer shell component 1 and an inner shell component 2 respectively by utilizing punch forming;

extruding the groove 4 on the outer wall of the inner shell part 2 in an extruding way;

cutting the shape and size of the bottom and the four side walls of the shell part 1 from the silk screen by using a laser marking machine, bending the shell part into the shape of the shell part 1, and then closely attaching the shell part 1;

automatically spraying solder on the lower surface of the top flange of the inner shell part 2 by using a dispenser, manually spraying the solder on the bottom of the inner shell part 2, connecting the inner shell part with the shell part 1 attached with the silk screen, and sintering the inner shell part in a high-temperature furnace at 550 ℃;

the working medium deionized water is poured into the soaking plate by using an injector, then the inside of the soaking plate is vacuumized by using a vacuum machine, and then the opening is nipped off. Specifically, when the vacuum degree in the cavity is below 7Pa, the seal is immediately cut off.

In other embodiments, the wire mesh is formed by sintering a double-layer wire mesh with the thickness of 0.06mm, meanwhile, the shell part 1 is formed by punching an aluminum plate with the thickness of 0.08mm, a layer of 200-mesh dendritic copper powder is uniformly paved in the groove 4 on the side wall of the inner shell part 2, and the wire mesh is sintered at high temperature of 960 ℃. In other embodiments, the air passage structure of the inner shell member 2 may also adopt an array point column structure.

It can be understood that the utility model discloses a phase transition heat transfer technique is different from traditional forced air cooling and direct water-cooling inefficiency, and phase transition heat transfer soaking plate has good heat transfer performance and samming performance. The utility model discloses an ultra-thin vapor chamber technique is as supporting, under the prerequisite of guaranteeing the vapor chamber basic performance, has effectively avoided the increase by a wide margin of battery module volume and weight, and material cost and manufacturing cost also reduce by a wide margin simultaneously. The utility model discloses directly replace battery plastic-aluminum shell with ultra-thin soaking plate, can effectively reduce the thermal resistance of solid rigid coupling contact face, make the more direct soaking plate that passes through of heat transmit away, the local high temperature of efficient reduction battery more. The utility model discloses power battery heat conduction shell material, in the actual production and processing, can directly regard as basic container or the mould in the manufacturing process of battery, realized the step-by-step and the substitutability that the battery made, realized that the battery manufacturing process is more high-efficient convenient.

Referring to fig. 1-2, the utility model discloses new forms of energy trolley-bus of third aspect embodiment, the new forms of energy trolley-bus includes the utility model discloses the power battery of first aspect embodiment replaces ultra-thin soaking plate shell with the aluminum-plastic shell of ultra-thin soaking plate technique with battery electricity core, directly dispels the heat and the samming to inside electric core structure, realizes power battery's high-efficient heat management to can satisfy the heat management requirement when facing extreme condition.

The technical features of the embodiments described above can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The embodiments of the present invention have been described in detail with reference to the drawings, but the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.

Claims (10)

1. A power cell, comprising:

an electric core;

the shell assembly comprises a cavity for accommodating the battery cell, the battery cell is arranged in the cavity, a capillary structure is arranged in the shell assembly so as to have phase change characteristics, and the shell assembly is contacted with the battery cell as a soaking plate.

2. The power cell of claim 1, wherein: the shell assembly comprises an inner shell part and an outer shell part, the inner shell part is provided with a cavity for accommodating a battery cell, the outer shell part is arranged on the periphery of the inner shell part in a covering mode, a sealed space is formed between the outer shell part and the inner shell part in a surrounding mode, and a plurality of grooves are formed in the inner shell part to serve as an air flue structure in the sealed space; the capillary structure is a wick which is arranged on the shell component so as to directly radiate and equalize the temperature of the battery cell in the sealed space.

3. The power cell of claim 2, wherein: the grooves comprise longitudinal grooves and multi-directional grooves, each longitudinal groove is arranged on each side wall of the inner shell, each multi-directional groove is arranged at the bottom of the inner shell, and the multi-directional grooves serve as working medium pools and are communicated with the longitudinal grooves.

4. The power cell of claim 3, wherein: each longitudinal groove is arranged at intervals along the length direction of the inner shell component, part of the multi-directional grooves are arranged along the width direction of the inner shell component, part of the multi-directional grooves are arranged along the thickness direction of the inner shell component, and all the multi-directional grooves are communicated with each other.

5. The power cell of claim 3 or 4, wherein: at least one of the longitudinal grooves or the multidirectional grooves is processed and formed in a stamping, extruding or multi-surface etching mode.

6. The power cell of claim 2, wherein: the top end of the inner shell component is provided with a flange structure, the inner shell component is connected with the outer shell component in a welding mode through the flange structure, and the bottom of the inner shell component is connected with the bottom of the outer shell component in a welding mode.

7. The power cell of claim 2, wherein: the inner shell part and the outer shell part are made of copper or aluminum, and the thickness of the inner shell part and the outer shell part is 0.1-1 mm.

8. The power cell of claim 2, wherein: the side wall thickness of the power battery is 0.2-2 mm, and the overall thermal conductivity is more than 1000W/(K.m).

9. The power cell of claim 2, wherein: the liquid absorption core is a silk screen or a woven bag, and the liquid absorption core is tightly attached to the surface of the shell component.

10. A new energy electric car, characterized by comprising: the power cell of any one of claims 1 to 9.

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