CN111554837B - Laminate polymer battery module - Google Patents

Laminate polymer battery module Download PDF

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Publication number
CN111554837B
CN111554837B CN202010487958.3A CN202010487958A CN111554837B CN 111554837 B CN111554837 B CN 111554837B CN 202010487958 A CN202010487958 A CN 202010487958A CN 111554837 B CN111554837 B CN 111554837B
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China
Prior art keywords
channel
end plate
plate
pressure relief
battery module
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CN202010487958.3A
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CN111554837A (en
Inventor
吴洋
王永
潘乐平
吴定国
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Hefei Gotion High Tech Power Energy Co Ltd
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Hefei Guoxuan High Tech Power Energy Co Ltd
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Publication of CN111554837A publication Critical patent/CN111554837A/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/62—Heating or cooling; Temperature control specially adapted for specific applications
    • H01M10/625—Vehicles
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/116—Primary casings; Jackets or wrappings characterised by the material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/147—Lids or covers
    • H01M50/148—Lids or covers characterised by their shape
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Sealing Battery Cases Or Jackets (AREA)
  • Battery Mounting, Suspending (AREA)

Abstract

The application can provide a laminate polymer battery module with good protection reliability, good flame retardant efficiency characteristics. Wherein, a laminate polymer battery module includes: a soft package battery assembly; a housing for accommodating the pouch cell assembly; the positive electrode and the negative electrode of the soft package battery assembly are led out of the shell; the shell comprises two end plates and a middle shell connected between the two end plates; the end plate and the middle shell form a cavity for accommodating the soft-package battery assembly; the end plate is internally provided with a pressure relief circuitous channel; the pressure relief circuitous channel is provided with an inlet communicated with the cavity and an outlet communicated with the outside of the shell; the pressure relief circuitous channel at least comprises a first channel and a second channel which are parallel; the fluid flow directions of the first channel and the second channel are opposite; one end of the first channel is communicated with one end of the second channel.

Description

Laminate polymer battery module
Technical Field
The invention belongs to the technical field of power batteries, and particularly relates to a soft package battery module with a safety protection structure.
Background
At present ternary laminate polymer battery module is along with energy density is higher and higher, and the phenomenon of starting a fire that battery module thermal runaway causes is more and more violent to be difficult to effective control and putting out, simultaneously because other module thermal runaway extensions around a large amount of thermal production can cause fast, outside condition of a fire can appear in the battery system short time, has compressed the passenger time of fleing, seriously threatens passenger life safety. The safety protection of the soft package battery module is limited to the situation that the battery system extinguishes the fire after the fire happens, but the effect is very little, and the escape time of passengers cannot be effectively guaranteed.
Disclosure of Invention
In view of the above insufficiency, an object of this application is to provide a laminate polymer battery module that has that protection reliability is good, fire-retardant effectual characteristics.
In order to achieve the effect, the following technical scheme is adopted in the application:
a pouch battery module, includes:
a soft package battery assembly;
a housing for accommodating the pouch cell assembly; the positive electrode and the negative electrode of the soft package battery assembly are led out of the shell; the shell comprises two end plates and a middle shell connected between the two end plates; the end plate and the middle shell form a cavity for accommodating the soft-package battery assembly; the end plate is internally provided with a pressure relief circuitous channel; the pressure relief circuitous channel is provided with an inlet communicated with the cavity and an outlet communicated with the outside of the shell; the pressure relief circuitous channel at least comprises a first channel and a second channel which are parallel; the fluid flow directions of the first channel and the second channel are opposite; one end of the first channel is communicated with one end of the second channel.
As a preferred embodiment, the end plate includes: an end plate top wall, and an end plate bottom wall opposite the end plate top wall; the extending direction of the first channel and the second channel is parallel to the direction from the end plate bottom wall to the end plate top wall.
As a preferred embodiment, the pressure relief detour channel further comprises a third channel and a fourth channel parallel to the first channel; one end of the first channel is communicated with the inlet; the first channel, the second channel, the third channel and the fourth channel are sequentially connected end to end, and the other end of the fourth channel is communicated with the outlet.
In a preferred embodiment, the end plate has a plurality of partition plates inside; the plurality of partition plates form the pressure relief circuitous channel in the end plate; the partition plate comprises a narrow plate part and a wide end part positioned at one end of the narrow plate part; the width of the wide end portion is larger than the width of the narrow plate portion.
As a preferred embodiment, the plurality of partition plates include a middle partition plate, and side partition plates located at both sides of the middle partition plate; the wide end part of the middle partition plate is vertical to the narrow plate part; the wide end portion of the side partition plate is the same as the extending direction of the narrow plate portion.
In a preferred embodiment, the total channel cross-sectional area of the pressure relief detour channel between the inlet and the outlet is more than 800mm2。
In a preferred embodiment, the soft package battery assembly has positive and negative electrodes and a plug terminal for external communication; ceramic sheaths arranged on the end plates are arranged outside the positive electrode, the negative electrode and the plug-in terminals; the communicating area of the cavity communicated with the outside of the shell through the gap of the ceramic sheath is less than 5mm2。
In a preferred embodiment, the pressure relief detour channel has a symmetrical structure.
As a preferred embodiment, the end plate comprises an end plate outer shell and an end plate inner shell; the end plate inner shell is covered and fixed on the inner side of the end plate outer shell and is in sealing fit with the partition plate; the inlet and the outlet are disposed adjacent an end plate top wall of the end plate opposite the end plate bottom wall of the end plate.
In a preferred embodiment, a pouring sealant is injected outside the soft package battery assembly in the cavity; the pouring sealant is injected into the cell tab of the soft package battery assembly and is highly soaked in the cell tab, and the height of the pouring sealant is lower than that of the inlet.
In a preferred embodiment, the height of the pouring sealant is 3mm to 8mm lower than the height of the inlet.
As a preferred embodiment, a heat conducting glue is arranged between the bottom wall of the cavity and the soft package battery assembly; and mica sheets with fireproof paint covered on the surfaces are arranged on the other inner walls of the cavity.
Has the advantages that:
the utility model provides a laminate polymer battery module is through being equipped with the circuitous passageway of pressure release on the end plate, and then utilize the circuitous tortuous characteristics of passageway route of the circuitous passageway of pressure release when thermal runaway appears in the battery, avoid the combustible substance to leak to the outside, make laminate polymer battery module's outside can't continuously appear naked light because of the combustible substance is not enough, thereby slow down the thermal expansion influence of the module of thermal runaway to other modules in the battery system, improve battery system's security, can see out, the laminate polymer battery module that this application provided has the characteristics that protection reliability is good and flame retardant efficiency is good.
Specific embodiments of the present invention are disclosed in detail with reference to the following description and drawings, indicating the manner in which the principles of the invention may be employed. It should be understood that the embodiments of the invention are not so limited in scope.
Features that are described and/or illustrated with respect to one embodiment may be used in the same way or in a similar way in one or more other embodiments, in combination with or instead of the features of the other embodiments.
It should be emphasized that the term "comprises/comprising" when used herein, is taken to specify the presence of stated features, integers, steps or components but does not preclude the presence or addition of one or more other features, integers, steps or components.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of a pouch battery module according to an embodiment of the present invention.
Fig. 2 is an exploded schematic view of fig. 1.
Fig. 3 is a schematic structural diagram of the pouch battery assembly of fig. 1.
Fig. 4 is a schematic diagram of the protection of the inner wall of the module enclosed cavity of fig. 1.
Fig. 5 is a schematic view of the pressure relief bypass channel structure of the end plate of fig. 1.
Fig. 6 is a schematic view of the pressure relief fluid flow path of fig. 5.
Fig. 7 is a schematic diagram of the high voltage protection of the pouch cell assembly of fig. 1.
Fig. 8 is a schematic view of the low voltage protection of the pouch cell assembly of fig. 1.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, shall fall within the scope of protection of the present invention.
It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1 to 8, an embodiment of the present application provides a pouch battery module, including: a pouch battery assembly 300; a housing for accommodating the pouch cell assembly 300; the positive electrode 401 and the negative electrode 401 of the soft package battery assembly 300 are led out of the shell; the case includes two end plates 200, and a middle case 100 connected between the two end plates 200; the end plate 200 and the middle shell 100 form a cavity for accommodating the pouch battery assembly 300. Wherein, the end plate 200 has a pressure relief detour channel 208 inside; the pressure relief detour channel 208 has an inlet 2081 communicating with the cavity and an outlet 2082 communicating with the outside of the housing. The pressure relief detour channel 208 at least comprises a first channel 210 and a second channel 211 which are parallel; the fluid flow directions of the first channel 210 and the second channel 211 are opposite; one end of the first passage 210 communicates with one end of the second passage 211.
When the battery is in thermal runaway and a large amount of smoke and sparks need to be ejected outwards from the inside of the case, the smoke and sparks can only be exhausted to the outside of the pouch battery module through the pressure relief bypass channel 208 of the end plate 200, wherein a large amount of combustible materials in the smoke can be accumulated in the pressure relief bypass channel 208 and cannot be exhausted to the outside of the case to be filtered due to the long path and the tortuous path of the pressure relief bypass channel 208 in the process of passing through the pressure relief bypass channel 208, and further, open fire cannot be continuously generated outside the pouch battery module due to insufficient combustible materials exhausted to the outside, and air is difficult to enter the pressure relief bypass channel 208 or enter the cavity through the pressure relief bypass channel 208 due to the large internal pressure of the case, so that the inside of the pouch battery module can not be continuously combusted due to insufficient air, and therefore, the pouch battery module provided by this embodiment can alleviate the thermal expansion influence of the thermal runaway module on other modules in the battery system, the safety of the battery system is improved.
The soft package battery assembly 300 has a positive electrode 401 and a negative electrode 401, and a plug terminal 411 for external communication. Specifically, the pouch battery assembly 300 is composed of a plurality of pouch cells 301 and two integrated cover plate assemblies (400, 410). A fireproof compressible spacer is arranged between the soft-package battery cores 301. Two integrated apron assembly includes a plurality of busbar 400 and signal acquisition assembly 410, a plurality of busbar 400 carries out the connection in series-parallel with soft-packaged electrical core 301 to there is anodal 401a negative pole 401b, signal acquisition assembly 410 is used for gathering connection in series-parallel voltage and electric core temperature, and has one and external communication connect to connect and connect terminal 411.
Wherein the two end plates 200 may include a front end plate 201 and a rear end plate 202. The front end plate 201 and the rear end plate 202 have similar overall structures and both have the pressure relief detour channel 208, and the same parts are not described again in this embodiment, and the pressure relief detour channel 208 described below is all described based on the internal channel of the rear end plate 202. The difference between the two is that the front plate 201 is compared with the rear plate 202, the positive and negative electrodes 401 and the plug terminal 411 are led out from the front plate 201, and the plug terminal 411 is located approximately at the middle position between the positive electrode 401a and the negative electrode 401 b. The lead-out holes 220 of the front end plate 201 for leading out the positive and negative electrodes 401 do not communicate with the inside of the end plate 200. The outlet hole 220 of the rear end plate forms a closed hoisting hole. The front plate 201 is additionally provided with the outlet holes of the plug terminals 411, similar to the outlet holes 220 of the positive and negative electrodes 401, and the outlet holes of the plug terminals 411 are located at the central position and are not communicated with the pressure relief detour channel 208.
The middle shell 100 comprises an upper shell 101 and a lower shell 102, wherein the upper shell 101, the lower shell 102, a front end plate 201 and a rear end plate 202 are welded to form an approximately closed cavity, and the soft-package battery assembly 300 is accommodated. In order to prevent substances such as combustible substances from flowing out of other parts of the end plate 200, insulating high-temperature-resistant sheaths installed on the end plate 200 are arranged outside the positive electrode 401, the negative electrode 401 and the plug terminal 411, specifically, the insulating high-temperature-resistant sheaths are ceramic sheaths, and the ceramic sheaths can be made of materials such as alumina and zirconia. As shown in fig. 7, the positive and negative electrodes 401 are respectively covered with ceramic sheaths 401 and mounted inside the end plate 200, and the ceramic sheaths 401 not only resist high temperature, but also seal the gap between the positive and negative electrodes 401 and the end plate 200 to form high-voltage protection of the soft-package battery assembly 300. As shown in fig. 8, the plug terminal 411 is externally sleeved with a ceramic sheath 460 and is mounted on the inner side of the end plate 200, and the ceramic sheath 460 is not only resistant to high temperature, but also seals the gap between the positive and negative electrodes 401 and the end plate 200 to form a low-voltage protection of the pouch battery assembly 300. To make the cavity and the outside release pressure as much as possibleThe circuitous channel 208 is communicated to improve the safety protection effect, and the communication area of the cavity communicated with the outside of the shell through the gap of the ceramic sheath is less than 5mm2。
In this embodiment, a potting adhesive is injected outside the pouch battery assembly 300 in the cavity. The pouring sealant is injected to a height which is higher than that of the battery core tab of the soft package battery assembly 300, and the height of the pouring sealant is lower than that of the inlet 2081. The height of the pouring sealant is 3mm-8mm lower than that of the inlet 2081. Preferably, the pouring height of the pouring sealant is about 5mm lower than that of the inlet 2081.
The lower case 102 has left and right cavity side walls (with an orientation facing the front end plate 201 as a reference) 1022, 1023, and a cavity bottom wall 1021, and the upper case 101 is fixedly welded to the upper side of the lower case 102 to form a cavity top wall. The two end plates 200 form front and rear cavity side walls. And heat-conducting glue is arranged between the bottom wall 1021 of the cavity and the soft-package battery assembly 300. Through this heat-conducting adhesive, dispel the heat to the laminate polymer battery core, avoid the inside high temperature of laminate polymer battery module to arouse the thermal runaway, simultaneously, for promoting the safety protection performance, other inner walls (non-cavity diapire 1021) of cavity are equipped with fire prevention temperature resistant material, and are concrete, other inner walls of cavity are equipped with the mica sheet that the surface covered has fire retardant coating. So, this laminate polymer battery module both can have good radiating effect, has good safety protection performance simultaneously concurrently.
In the present embodiment, the end plate 200 includes: an end plate top wall 2061, and an end plate bottom wall 2062 opposite the end plate top wall 2061. The first and second passages 210, 211 extend in a direction parallel to the direction from the end plate bottom wall 2062 to the end plate top wall 2061. The pressure relief detour channel 208 further comprises a third channel 212 and a fourth channel 213 which are parallel to the first channel 210. One end of the first passage 210 is communicated with the inlet 2081; the first passage 210, the second passage 211, the third passage 212 and the fourth passage 213 are sequentially connected end to end, and the other end of the fourth passage 213 is communicated with the outlet 2082.
To increase the length of the pressure relief detour channel 208Forming a tortuous and circuitous structure, the end plate 200 has a plurality of spacer plates 207 on the inside. The plurality of partition plates 207 form the pressure relief detour channel 208 inside the end plate 200. In order to have better protection effect, the total channel cross-sectional area of the pressure relief circuitous channel 208 between the inlet 2081 and the outlet 2082 is more than 800mm2. Wherein the total cross-sectional area of the channels may be the cross-sectional area of the channels in the state shown in fig. 6.
The end plate 200 comprises an end plate outer shell 206 and an end plate inner shell 205; the end plate inner shell 205 is fixed to the inner side of the end plate outer shell 206 in a covering manner and is in sealing fit with the partition plate 207. The inlet 2081 and the outlet 2082 are disposed adjacent to an end plate top wall 2061 of the end plate 200, opposite to the end plate bottom wall 2062 of the end plate 200. The end plate inner shell 205 is welded and fixed on the inner side of the end plate outer shell 206 and is in sealing fit with the spacing plate 207. The end plate inner shell 205 is a flat plate structure, the end plate outer shell 206 has a front side wall and a peripheral side wall, and an inner side opening, the end plate inner shell 205 is welded and fixed on the end plate outer shell 206 to cover and seal the inner side opening, and under the spacing action of the spacing plate 207, a pressure relief detour channel 208 similar to a "serpentine channel" is formed. Outlet 2082 is located on the outside wall of the end plate outer shell 206 and inlet 2081 is located on the end plate inner shell 205. The end plate inner shell 205 has a groove 2052 at its upper end, the groove 2052 and the end plate top wall 2061 enclosing an inlet 2081 of the pressure relief bypass passage 208.
To facilitate fixing the welded end plate inner shell 205, the structural strength is improved, and the partition 207 includes a narrow plate 2071 and a wide end 2072 located at one end of the narrow plate 2071. The wide end part 2072 has a width greater than that of the narrow plate part 2071. The wide end 2072 provides a welding point, and a welding position mark 2051 corresponding to the wide end 2072 may be marked on the end plate inner shell 205. When the end plate inner casing 205 is mounted, the welding position indicator 2051 is aligned with the corresponding wide end 2072 and then welded and fixed. The width broad of wide tip 2072 not only makes things convenient for the welding, can provide the welding area of preferred, promotes the stable in structure of hookup location, and simultaneously, wide tip 2072 can also participate in forming the circuitous passageway 208 of pressure release, promotes channel length, improves module safety protection performance.
The plurality of partition plates 207 includes a middle partition plate 2075, and side partition plates 2076 at both sides of the middle partition plate 2075; the wide end 2072 of the middle spacer 2075 is perpendicular to the narrow plate 2071; the wide end 2072 of the side spacer 2076 and the narrow end 2071 extend in the same direction. In this embodiment, the pressure relief detour channel 208 has a symmetrical structure. The side spacers 2076 are symmetrically disposed on both sides of the middle spacer 2075, and accordingly, symmetrical pressure relief detour channels 208 are formed on both sides of the middle spacer 2075. Wherein the intermediate partition 2075 has a first passage 210, a second passage 211, a third passage 212, and a fourth passage 213 at both sides thereof. Correspondingly, outlets 2082 are also provided on both sides of the intermediate spacer 2075.
The first channel 210 is located at a middle position of the end plate 200, and the first channel 210, the second channel 211, the third channel 212, and the fourth channel 213 are sequentially arranged in parallel toward the end plate left sidewall 2063 (or the end plate right sidewall 2064) of the end plate 200. A communication passage 214 is formed between the side partition plate 2076 and the end plate bottom wall 2062, the communication passage 214 communicating the lower ends of the first passage 210 and the second passage 211, and the upper end of the first passage 210 communicating with the inlet 2081. The second passage 211 communicates with the upper end of the third passage 212, the lower end of the third passage 212 communicates with the lower end of the fourth passage 213 through another communicating passage 214, and the upper end of the fourth passage 213 communicates with the outlet 2082.
Any numerical value recited herein includes all values from the lower value to the upper value, in increments of one unit, provided that there is a separation of at least two units between any lower value and any higher value. For example, if it is stated that the number of a component or a value of a process variable (e.g., temperature, pressure, time, etc.) is from 1 to 90, preferably from 20 to 80, and more preferably from 30 to 70, it is intended that equivalents such as 15 to 85, 22 to 68, 43 to 51, 30 to 32 are also expressly enumerated in this specification. For values less than 1, one unit is suitably considered to be 0.0001, 0.001, 0.01, 0.1. These are only examples of what is intended to be explicitly recited and all possible combinations of numerical values between the lowest value and the highest value enumerated are to be considered to be explicitly recited in this specification in a similar manner.
Unless otherwise indicated, all ranges include the endpoints and all numbers between the endpoints. The use of "about" or "approximately" with a range applies to both endpoints of the range. Thus, "about 20 to about 30" is intended to cover "about 20 to about 30", including at least the endpoints specified.
All articles and references disclosed, including patent applications and publications, are hereby incorporated by reference for all purposes. The term "consisting essentially of …" describing a combination shall include the identified element, ingredient, component or step as well as other elements, ingredients, components or steps that do not materially affect the basic novel characteristics of the combination. The use of the terms "comprising" or "including" to describe combinations of elements, components, or steps herein also contemplates embodiments that consist essentially of such elements, components, or steps. By using the term "may" herein, it is intended to indicate that any of the described attributes that "may" include are optional.
A plurality of elements, components, parts or steps can be provided by a single integrated element, component, part or step. Alternatively, a single integrated element, component, part or step may be divided into separate plural elements, components, parts or steps. The disclosure of "a" or "an" to describe an element, ingredient, component or step is not intended to foreclose other elements, ingredients, components or steps.
It is to be understood that the above description is intended to be illustrative, and not restrictive. Many embodiments and many applications other than the examples provided will be apparent to those of skill in the art upon reading the above description. The scope of the present teachings should, therefore, be determined not with reference to the above description, but should instead be determined with reference to the appended claims, along with the full scope of equivalents to which such claims are entitled. The disclosures of all articles and references, including patent applications and publications, are hereby incorporated by reference for all purposes. The omission in the foregoing claims of any aspect of subject matter that is disclosed herein is not intended to forego such subject matter, nor should the inventors be construed as having contemplated such subject matter as being part of the disclosed subject matter.

Claims (8)

1. The utility model provides a laminate polymer battery module which characterized in that includes:
a soft package battery assembly;
a housing for accommodating the pouch cell assembly; the positive electrode and the negative electrode of the soft package battery assembly are led out of the shell; the shell comprises two end plates and a middle shell connected between the two end plates; the end plate and the middle shell form a cavity for accommodating the soft-package battery assembly; the end plate is internally provided with a pressure relief circuitous channel; the pressure relief circuitous channel is provided with an inlet communicated with the cavity and an outlet communicated with the outside of the shell; the pressure relief circuitous channel at least comprises a first channel and a second channel which are parallel; the fluid flow directions of the first channel and the second channel are opposite; one end of the first channel is communicated with one end of the second channel;
the end plate is internally provided with a plurality of partition plates; the plurality of partition plates form the pressure relief circuitous channel in the end plate; the partition plate comprises a narrow plate part and a wide end part positioned at one end of the narrow plate part; the width of the wide end portion is larger than the width of the narrow plate portion; the wide end part is convenient to weld and participates in forming the pressure relief circuitous channel;
the plurality of spacing plates comprise a middle spacing plate and side spacing plates positioned on two sides of the middle spacing plate; the two sides of the middle partition plate form the symmetrical pressure relief circuitous channels, and the wide end part of the middle partition plate is vertical to the narrow plate part of the middle partition plate; the wide end portion of the side partition plate extends in the same direction as the narrow plate portion thereof.
2. The pouch battery module as defined in claim 1 wherein the end plate comprises: an end plate top wall, and an end plate bottom wall opposite the end plate top wall; the extending direction of the first channel and the second channel is parallel to the direction from the end plate bottom wall to the end plate top wall.
3. The laminate battery module as claimed in claim 1, wherein the pressure relief detour channel further comprises a third channel and a fourth channel parallel to the first channel; one end of the first channel is communicated with the inlet; the first channel, the second channel, the third channel and the fourth channel are sequentially connected end to end, and the other end of the fourth channel is communicated with the outlet.
4. The pouch cell module according to claim 1, wherein the total channel cross-sectional area of the pressure relief detour channel between the inlet and the outlet is > 800mm2。
5. The pouch battery module as defined in claim 1, wherein the circuitous channel is a symmetrical structure.
6. The pouch battery module of claim 1, wherein a potting compound is injected outside the pouch battery assembly within the cavity; the pouring sealant is injected to a height which is higher than that of a battery core tab of the soft package battery assembly, and the height of the pouring sealant is lower than that of the inlet.
7. The pouch battery module as defined in claim 6, wherein the height of the pouring sealant lower than the height of the inlet is 3mm-8 mm.
8. The laminate battery module as recited in claim 1, wherein a thermally conductive adhesive is disposed between the bottom wall of the cavity and the laminate battery assembly; and mica sheets with fireproof paint covered on the surfaces are arranged on the other inner walls of the cavity.
CN202010487958.3A 2020-06-02 2020-06-02 Laminate polymer battery module Active CN111554837B (en)

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CN111554837A CN111554837A (en) 2020-08-18
CN111554837B true CN111554837B (en) 2022-06-07

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