CN110120492B

CN110120492B - Heat-equalizing bipolar battery stack

Info

Publication number: CN110120492B
Application number: CN201810123633.XA
Authority: CN
Inventors: 张晓虎; 陈永翀; 朱峰; 张彬; 李尚昆; 张艳萍
Original assignee: Beijing Hawaga Power Storage Technology Co ltd
Current assignee: Haofengguang Energy Storage Chengdu Co ltd
Priority date: 2018-02-07
Filing date: 2018-02-07
Publication date: 2021-01-26
Anticipated expiration: 2038-02-07
Also published as: CN110120492A

Abstract

The invention provides a heat balance type bipolar battery stack, wherein a heat balance device is arranged in the heat balance type bipolar battery stack. The heat equalizing device comprises a first guide plate internally provided with a first channel and a second guide plate internally provided with a second channel. The first guide plates are respectively arranged between two adjacent groups of electrode plates in the horizontal direction and are arranged on the upper side and the lower side of the bipolar battery stack, and the second guide plates are respectively arranged along the insulating sealing frames of one group or multiple groups of electrode plates in the vertical direction. The first guide plate and the second guide plate are fixedly connected, so that the first channels and the second channels of the first guide plate and the second guide plate which are connected with each other are in fluid communication, and an integral fluid channel is formed in the first channels of the plurality of first guide plates and the second channels of the plurality of second guide plates. By injecting cooling fluid or heating fluid into the channel, the cooling, heating and thermal equalization of the bipolar battery stack can be realized, thereby improving the safety performance, low-temperature performance and the like of the battery stack.

Description

Heat-equalizing bipolar battery stack

Technical Field

The invention relates to the field of batteries, in particular to a bipolar battery.

Background

The battery stack of the bipolar battery consists of two unipolar electrode plates, a plurality of bipolar electrode plates, an isolation layer and electrolyte. The bipolar electrode plate is an electrode plate with two polarities after a positive electrode material layer and a negative electrode material layer are respectively coated on two sides of the bipolar plate, and the unipolar single electrode plate is an electrode plate with unipolar after a positive electrode material layer or a negative electrode material layer is coated on one side of the unipolar plate. Because the battery units of the bipolar battery stack are composed of the electrode plate, the positive electrode material layer, the isolating layer, the negative electrode material layer and the other electrode plate, and each battery unit is of an independent electrochemical structure, the number of the battery units can be increased by increasing the number of the bipolar electrode plates, and the overall voltage of the battery is further improved. The bipolar battery has the advantages of small energy consumption of resistance among battery units, uniform distribution of surface current and potential of the electrode, high charging and discharging speed of the battery and the like, so that the bipolar battery is suitable for the fields of electric vehicles, electric power energy storage and the like.

In order to meet the application requirements of the bipolar battery stack, a plurality of electrode plates need to be stacked to increase the working voltage of the battery stack. However, the more the number of electrode sheet stacks is, the more heat of the battery unit in the middle area of the battery stack cannot be dissipated as soon as possible, so that thermal runaway of the battery stack is easily caused, and safety accidents are caused; in addition, temperature gradients exist between the battery units in the middle area and the battery units in the side area of the battery stack, particularly, in the process of high-rate charge and discharge, the phenomenon of temperature imbalance among the battery units in the battery stack is more serious, so that the problem of inconsistency among the battery units is more prominent, the battery stack works in an environment with uneven temperature for a long time, the performance of the battery stack is reduced, and the service life of the battery stack is shortened.

Disclosure of Invention

In order to solve the problems, the invention provides a heat balance type bipolar battery stack, wherein a heat balance device is arranged in the heat balance type bipolar battery stack, the heat balance device comprises a first guide plate made of an electronic conducting material and a second guide plate made of an electronic insulating material, the first guide plate is arranged along the surface of an electrode plate, and the second guide plate is arranged along the side face of an insulating sealing frame of the electrode plate. The first guide plate and the second guide plate are internally provided with channels, and cooling, heating and heat equalization of the bipolar battery stack can be realized by injecting cooling fluid or heating fluid into the channels.

The technical scheme provided by the invention is as follows:

the invention provides a heat balance type bipolar battery stack which comprises n groups of electrode plates, wherein n is more than or equal to 2, and the number of each group of electrode plates is more than or equal to 2. Each group of electrode plates can comprise a single or a plurality of bipolar electrode plates, and a unipolar positive plate and a unipolar negative plate which are respectively arranged on the upper side and the lower side of the single or the plurality of bipolar electrode plates. Each group of electrode plates can also only comprise two unipolar electrode plates, in this case, the first guide plate can function as a bipolar plate, and the first guide plate, the unipolar positive plate and the unipolar negative plate which are positioned on two sides of the first guide plate jointly form a structure similar to the bipolar electrode plates. The electrode plates are stacked up and down in series according to the order that electrode material layers with different polarities are oppositely arranged, an isolation layer is arranged between the adjacent electrode plates, and an insulating sealing frame is arranged on the peripheral edge of the electrode plate. The heat balance type bipolar battery stack is provided with a heat balance device, the heat balance device comprises a first guide plate and a second guide plate, the first guide plate is internally provided with a first channel, the second guide plate is internally provided with a second channel, the first channel forms a first channel injection port and a first channel discharge port on the side surface of the first guide plate, and the second channel forms a second channel injection port and a second channel discharge port on the side surface of the second guide plate. A plurality of (i.e., n + 1) first flow-guide plates are respectively disposed between the adjacent two sets of electrode sheets in the horizontal direction and on the outside of the uppermost electrode sheet among the first set of electrode sheets located at the top (i.e., above the upper unipolar electrode sheet among the first set of electrode sheets) and the outside of the lowermost electrode sheet among the nth set of electrode sheets located at the bottom (i.e., below the lower unipolar electrode sheet among the nth set of electrode sheets), that is, a plurality of first flow-guide plates are respectively disposed between the two sets of electrode sheets among the n sets of electrode sheets and on the upper and lower sides of the entirety of the n sets of electrode sheets. And the second guide plates are respectively arranged along the side surfaces of the insulating sealing frames of one or more groups of electrode plates in the vertical direction. The first baffle and the second baffle can be fixedly connected with each other so that the first channel of the first baffle is in fluid communication with the second channel of the second baffle, thereby forming an integral fluid channel in the first channels of the plurality of first baffles and the second channels of the plurality of second baffles. The conventional bipolar battery stack comprises a plurality of bipolar electrode plates and two unipolar electrode plates positioned on the upper side and the lower side of the plurality of bipolar electrode plates, and different from the conventional bipolar battery stack, the thermal equilibrium type bipolar battery stack comprises a plurality of groups of electrode plates, and each group of electrode plates comprises two unipolar electrode plates and zero or more bipolar electrode plates. A first guide plate is arranged between the two adjacent groups of electrode plates, and the first guide plate can conduct electrons, so that the function of transferring the electrons between the two adjacent groups of electrode plates is achieved; the first channel in the first baffle can transmit fluid, so that the temperature of each group of electrode plates can be controlled by controlling the temperature of the fluid. The second guide plate arranged on the side face of the bipolar battery stack along the vertical surface of the insulating sealing frame is electronically insulated, so that electrons of a plurality of first guide plates connected with the same second guide plate can be prevented from being conducted, and internal short circuit of the bipolar battery stack can be prevented; the second channels in the second flow guide plate can transmit fluid, and the cooling, heating and heat equalization of the bipolar battery stack can be realized by communicating with the first channels in the first flow guide plate in various ways to form serial, parallel and serial-parallel series fluid channels. The fluid in the fluid channel is one or a mixture of air, nitrogen, helium, inert gas, water, ethylene glycol, a mixed solution of water and ethylene glycol, a lithium salt-free electrolyte (i.e., an electrolyte solvent such as Ethylene Carbonate (EC), diethyl carbonate (DEC), dimethyl carbonate (DMC), Ethyl Methyl Carbonate (EMC), etc.), an electrolyte, hydrocarbon-based heat transfer oil, silicon-based heat transfer oil, dibenzyltoluene heat transfer oil, etc.

The extending path of the first channel in the first guide plate and the second channel in the second guide plate can be one or more of a straight line, a curve, a broken line, a branch line and the like. In addition, the inner diameters of the first and second passages may be a uniform-sized inner diameter or a non-uniform-sized inner diameter. The cross section of the first channel and the cross section of the second channel can be one or more of a circle, an ellipse, a triangle, a polygon, an irregular shape and the like.

The first channel injection opening and the first channel discharge opening may be located on the same side, on opposite sides, or on adjacent sides of the first baffle, which may be accomplished by varying the extension path of the first channel. At the same time, a plurality of second flow deflectors can be arranged on the same side, on the opposite side or on adjacent sides of the bipolar battery stack.

The first channel injection port can be located on one or more sides of the first baffle and the first channel exhaust port can also be located on one or more sides of the first baffle. In other words, by interacting sets of second flow deflectors (a plurality of second flow deflectors in each set) with the first flow deflectors, sets of fluid passages having different fluid inlet ports and/or different fluid outlet ports can be formed.

In the structure of the fluid channel formed by the first channel of the first guide plate and the second channel of the second guide plate in series, the second guide plate comprises two end part second guide plates and n middle part second guide plates, the end part second guide plates are provided with fluid injection and discharge channels, and the fluid injection and discharge channels are in fluid communication with the second channels in the end part second guide plates, so that the injected fluid is sent to the second channels of the end part second guide plates or the fluid in the second channels of the end part second guide plates is discharged. The ports of the fluid injection and discharge channels may be interfaced with an external circulation system such that heated or cooled fluid within the storage device is injected into the fluid injection and discharge fluid from the fluid injection and discharge channels into the storage device, and the number of ports of the fluid injection and discharge channels may be one or more. The second channel discharge port of the one end portion second flow guide plate is butted against the first channel injection port of the first flow guide plate located on the upper side of the first group of electrode tabs from the top of the bipolar battery stack, and the second channel injection port of the other end portion second flow guide plate is butted against the first channel discharge port of the first flow guide plate located on the lower side of the nth group of electrode tabs (i.e., the last group of electrode tabs) from the top of the bipolar battery stack, the second channel injection port of the nth middle portion second flow guide plate is butted against the first channel discharge port of the first flow guide plate located on the upper side of the nth group of electrode tabs and the second channel discharge port of the nth middle portion second flow guide plate is butted against the first channel injection port of the first flow guide plate located on the lower side of the nth group of electrode tabs, thereby forming a. As described above, according to the arrangement form of the first channel in the first guide plate and the arrangement form of the first channel injection port and the first channel discharge port, the two end second guide plates and the n middle second guide plates may be provided on one side, the opposite side, or the adjacent side of the bipolar battery stack, and in addition, a plurality of sets of second guide plates respectively including the two end second guide plates and the n middle second guide plates may be provided.

In the structure that the first channel of the first guide plate and the second channel of the second guide plate form a parallel fluid channel, the second guide plate is provided with a fluid injection and discharge channel, and the fluid injection and discharge channel is in fluid communication with the second channel in the second guide plate, so that the injected fluid is delivered into the second channel of the second guide plate or the fluid in the second channel of the second guide plate is discharged. And the second channel discharge port of one second guide plate is in butt joint with the first channel injection ports of all n +1 first guide plates, and the second channel injection port of the other second guide plate is in butt joint with the first channel discharge ports of all n +1 first guide plates, so that parallel fluid channels are formed among n groups of electrode plates. In this case, the second channel in the second baffle may be a plurality of tubular channels or an integral cavity disposed in the second baffle. As described above, the first channel in the first flow guide plate may be arranged in a direction perpendicular to the flow direction of the fuel, and the second channel may be arranged in a direction perpendicular to the flow direction of the fuel.

In the structure that the first channel of the first guide plate and the second channel of the second guide plate form a serial-parallel fluid channel, the second guide plate comprises two end part second guide plates and one or more middle part second guide plates, the end part second guide plates are provided with fluid injection and discharge channels, and the fluid injection and discharge channels are in fluid communication with the second channels in the end part second guide plates, so that the injected fluid is sent to the second channels of the end part second guide plates or the fluid in the second channels of the end part second guide plates is discharged. The first channel injection ports of all the first flow guide plates at the upper side, the lower side and the middle of m groups of electrode plates from the top of the bipolar battery stack are butted with the second channel discharge port of the second flow guide plate at one end, and the first channel discharge ports of all the first flow guide plates at the upper side, the lower side and the middle of m groups of electrode plates from the bottommost of the bipolar battery stack are butted with the second channel injection ports of the second flow guide plate at the other end. Each middle second guide plate corresponds to 2m +1 groups of electrode plates, wherein a second channel injection port of each middle second guide plate is in butt joint with first channel discharge ports of all the first guide plates on the upper side, the lower side and the middle of the m groups of electrode plates above, a second channel discharge port of each middle second guide plate is in butt joint with first channel injection ports of all the first guide plates on the upper side, the lower side and the middle of the m groups of electrode plates below, a plurality of middle second guide plates are arranged on the side surface of the bipolar battery stack in a staggered mode from the top of the heat equalizing bipolar battery stack to form a fluid channel in series-parallel hybrid connection, and n is greater than or equal to 1. That is, the end second baffles serve to connect the first flow channels of the plurality of first baffles in parallel, while the middle second baffle divides the first flow channels of the plurality of first baffles into several parallel parts and connects the first flow channels of the respective parallel parts in series as a whole. As described above, according to the arrangement form of the first channel in the first guide plate and the arrangement form of the first channel injection port and the first channel discharge port, the two end portion second guide plates and the plurality of middle portion second guide plates may be provided on one side surface, the opposite side surface, or the adjacent side surface of the bipolar battery stack, and in addition, a plurality of sets of second guide plates respectively including the two end portion second guide plates and the plurality of middle portion second guide plates may be provided.

The material of the first baffle can be an electronic conductive material, preferably an electronic conductive material with good heat conductivity, such as one or more of copper, aluminum, stainless steel, and the like. The material of the second fluidic plate can be an electrically insulating material.

The invention has the advantages that:

1) the first guide plate is arranged between each group of electrode plates in the bipolar battery stack, the first guide plate is made of a material which is electronically conductive and has good heat conductivity, the temperature of each group of electrode plates in the bipolar battery stack can be well controlled by controlling the temperature of fluid in the first channel in the first guide plate, the problems of cooling, heating and the like of each group of electrode plates in the battery stack are effectively solved, and the safety performance, the low-temperature performance and the like of the battery stack are improved.

2) The second guide plates are arranged to form fluid channels which are communicated in series, in parallel or in series-parallel, and through fluid flowing in the fluid channels, the temperature consistency among each group of electrode plates can be effectively kept, the battery performance is improved, and the service life of the battery is prolonged.

3) The heat balance device composed of the first guide plate and the second guide plate can help to complete the cooling, heating and heat balance of the cell stack, and the heat balance device is simple and flexible in structure and low in cost.

Drawings

FIG. 1 is a schematic cross-sectional view of a thermally balanced bipolar battery stack according to a first embodiment of the present invention;

fig. 2 is a schematic perspective view of a thermally balanced bipolar battery stack according to a first embodiment of the present invention, in which fig. 2(a) shows an exploded state of a second guide plate, and fig. 2(b) shows an assembled state of the second guide plate;

FIG. 3 is a schematic cross-sectional view of a thermally balanced bipolar battery stack according to a second embodiment of the present invention;

fig. 4 is a schematic perspective view of a thermally balanced bipolar battery stack according to a second embodiment of the present invention, in which fig. 4(a) shows an exploded state of a second guide plate, and fig. 4(b) shows an assembled state of the second guide plate;

FIG. 5 is a schematic cross-sectional view of a thermally balanced bipolar battery stack according to a third embodiment of the present invention;

fig. 6 is a schematic perspective view of a thermally balanced bipolar battery stack according to a third embodiment of the present invention, in which fig. 6(a) shows an exploded state of a second guide plate, and fig. 6(b) shows an assembled state of the second guide plate;

fig. 7 is a schematic cross-sectional view of a first baffle according to the present invention, wherein fig. 7(a) - (c) show different cross-sectional shapes of the first channel, respectively;

fig. 8 is a schematic plan view of a first baffle according to the present invention, wherein fig. 8(a) - (f) show different arrangements of the first channel, respectively.

List of reference numerals

101. 102, 103, 104, 105-first, second, third, fourth, fifth groups of electrode plates

2-first baffle

201-first channel

202-first channel injection Port

203-first channel exhaust

3-second baffle

301-second channel

302-second channel injection port

303-second channel discharge

3 a-end second baffle

3 b-middle second baffle

4-fluid injection and discharge channel

5-insulating sealing frame

Detailed Description

The invention will be further explained by embodiments in conjunction with the drawings.

Fig. 1 is a schematic cross-sectional view of a thermally balanced bipolar battery stack according to a first embodiment of the present invention. The thermally balanced bipolar battery stack shown in fig. 1 includes four sets of

electrode sheets

101, 102, 103, 104 and a series type thermal balancing device. Each group of electrode plates comprises a plurality of bipolar electrode plates and unipolar electrode plates arranged on the upper side and the lower side of the whole bipolar electrode plates. The heat equalizing device comprises a first flow deflector 2 and a second flow deflector 3, a first passage 201 being provided in the first flow deflector 2 and a second passage 301 being provided in the second flow deflector 3. Five first guide plates 2 are respectively arranged on the upper side of the first group of electrode plates 101 from the top of the bipolar battery stack, between the two adjacent groups of electrode plates and on the lower side of the fourth group of electrode plates 104 from the top of the bipolar battery stack, and each first guide plate is adjacent to and fixedly and conductively connected with the unipolar plate of the unipolar electrode plate in the adjacent electrode plate group. Four second flow deflectors 3 are arranged on the side faces of the bipolar battery stack along the insulating seal frames 5 of the electrode plates, and each second flow deflector 3 corresponds to one group of electrode plates. The first baffle 2 and the second baffle 3 are fixedly connected to each other such that the first channel 201 of the first baffle 2 is in fluid communication with the second channel 301 of the second baffle 3. As shown by the arrows in fig. 1, the fluid enters the first channel from one end of the first channel of the first guide plate located at the uppermost side, then flows through the second channel of the second guide plate located on the side surface of the first group of electrode plates 101, then flows through the first channel of the first guide plate located between the first group of electrode plates 101 and the second group of electrode plates 102, then flows through the second channel of the second guide plate located on the side surface of the second group of electrode plates 102, and so on, and finally flows out from one end of the first channel of the first guide plate located at the bottommost layer, thereby completing the series flow of the fluid in the bipolar battery stack.

Fig. 2 is a schematic perspective view of a thermally balanced bipolar battery stack according to a first embodiment of the present invention, in which fig. 2(a) shows an exploded state of a second guide plate, and fig. 2(b) shows an assembled state of the second guide plate. Fig. 2 shows an example of a series type heat equalizing apparatus. The number of the first guide plates 2 is five, and a first channel injection port and a first channel discharge port corresponding to each first channel are arranged on two opposite sides of each first guide plate. The second baffle 3 comprises two end second baffles 3a and four middle second baffles 3 b. The end part second guide plate 3a is provided with a fluid injection and discharge channel 4, the fluid injection and discharge channel 4 is in fluid communication with the second channel in the end part second guide plate 3a, and the side surface of the end part second guide plate 3a is provided with a second channel discharge port or a second channel injection port corresponding to each second channel. And a second channel injection port and a second channel discharge port corresponding to each second channel are respectively arranged on the side surface of each middle second guide plate 3 b. The number, position and size of the second channel injection ports 302 on the first and second baffles, which are correspondingly connected to each other, correspond to the number, position and size of the first channel exhaust ports 203, and the number, position and size of the second channel exhaust ports 303 correspond to the number, position and size of the first channel injection ports 202. By connecting the second baffle 3 to the first baffle 2, an integrated series flow channel is formed.

FIG. 3 is a schematic cross-sectional view of a thermally balanced bipolar battery stack according to a second embodiment of the present invention. The thermally balanced bipolar battery stack shown in fig. 3 includes four sets of

electrode tabs

101, 102, 103, 104 and a parallel type thermal balancing device. Each group of electrode plates comprises a plurality of bipolar electrode plates and unipolar electrode plates arranged on the upper side and the lower side of the whole bipolar electrode plates. The heat equalizing device comprises a first flow deflector 2 and a second flow deflector 3, a first passage 201 being provided in the first flow deflector 2 and a second passage 301 being provided in the second flow deflector 3. Five first guide plates 2 are respectively arranged on the upper side of the first group of electrode plates 101 from the top of the bipolar battery stack, between the two adjacent groups of electrode plates and on the lower side of the fourth group of electrode plates 104 from the top of the bipolar battery stack, and each first guide plate is adjacent to and fixedly and conductively connected with the unipolar plate of the unipolar electrode plate in the adjacent electrode plate group. Two second guide plates 3 are arranged on the side faces of the bipolar battery stack along the insulating seal frames 5 of the electrode plates, and each second guide plate corresponds to four groups of electrode plates. The first baffle 2 and the second baffle 3 are fixedly connected to each other such that the first channel 201 of the first baffle 2 is in fluid communication with the second channel 301 of the second baffle 3. As shown by the arrows in fig. 3, the fluid enters the second channel 301 from one end of the second channel of one second baffle 3, then enters the first channels 201 of five first baffles 2 in parallel, and finally flows out of the second channel 301 of another second baffle 3, thereby completing the parallel flow of the fluid in the bipolar cell stack.

Fig. 4 is a schematic perspective view of a thermally balanced bipolar battery stack according to a second embodiment of the present invention, in which fig. 4(a) shows an exploded state of a second guide plate, and fig. 4(b) shows an assembled state of the second guide plate. Fig. 4 shows an example of a parallel type heat equalizing apparatus. The number of the first guide plates 2 is five, and a first channel injection port and a first channel discharge port corresponding to each first channel are arranged on two opposite sides of each first guide plate. The number of the second baffles 3 is two, all the second passages in one second baffle are of an integral cavity structure and have second passage discharge ports on the side of the second baffle, and all the second passages in the other second baffle are of an integral cavity structure and have second passage injection ports on the side of the second baffle. And a fluid injection and discharge channel 4 is also arranged on the second guide plate 3 and is in fluid communication with a second channel in the second guide plate. The number, position and size of the second channel injection ports 302 on the first and second baffles, which are correspondingly connected to each other, correspond to the number, position and size of the first channel exhaust ports 203, and the number, position and size of the second channel exhaust ports 303 correspond to the number, position and size of the first channel injection ports 202. By connecting the second flow guide plate 3 to the first flow guide plate 2, an integrated parallel flow channel is formed.

Fig. 5 is a schematic cross-sectional view of a thermally balanced bipolar battery stack according to a third embodiment of the present invention. The thermally balanced bipolar battery stack shown in fig. 5 includes five sets of

electrode tabs

101, 102, 103, 104, 105 and a series-parallel type thermal balancing device. Each group of electrode plates comprises a plurality of bipolar electrode plates and unipolar electrode plates arranged on the upper side and the lower side of the whole bipolar electrode plates. The heat equalizing device comprises a first baffle in which a first channel 201 is arranged and a second baffle in which a second channel 301 is arranged. The six first guide plates 2 are respectively arranged on the upper side of the first group of electrode plates 101 from the top of the bipolar battery stack, between the two adjacent groups of electrode plates and on the lower side of the fifth group of electrode plates 105 from the top of the bipolar battery stack, and each first guide plate is adjacent to and fixedly and conductively connected with the unipolar plate of the unipolar electrode plate in the adjacent electrode plate group. The four second flow deflectors are arranged on the side face of the bipolar battery stack along the insulating sealing frames 5 of the electrode plates, wherein the two end second flow deflectors 3a correspond to the first group of electrode plates 101 and the fifth group of electrode plates 105 respectively, the middle second flow deflector on the upper side of the two middle second flow deflectors 3b corresponds to the first to third groups of electrode plates, and the middle second flow deflector on the lower side of the two middle second flow deflectors corresponds to the third to fifth groups of electrode plates. The first baffle and the second baffle are secured to each other such that the first channel 201 of the first baffle is in fluid communication with the second channel 301 of the second baffle. As shown by arrows in fig. 5, the fluid enters the second channel 301 from one end of the second channel of the end second flow guide plate 3a located on the side of the first group of electrode plates 101, then flows through the first channels 201 of the first flow guide plates 2 located on the upper and lower sides of the first group of electrode plates 101 in parallel to enter the second channel 301 of the middle second flow guide plate 3b located on the upper side, the fluid flows through the first channels 201 of the first flow guide plates 2 located on the upper and lower sides of the third group of electrode plates 103 in parallel after converging and descending the parts corresponding to the second group of electrode plates 102 in the second channel, then flows through the first channels of the first flow guide plates located on the upper and lower sides of the fifth group of electrode plates 105 in parallel after converging and descending the parts corresponding to the fourth group of electrode plates 104 in the second channel to enter the second channels of the end second flow guide plates 3a located on the side of the fifth group of electrode plates 105 and then is discharged, thereby completing the series-parallel flow of fluid in the bipolar cell stack.

Fig. 6 is a schematic perspective view of a thermally balanced bipolar battery stack according to a third embodiment of the present invention, in which fig. 6(a) shows an exploded state of the second guide plate, and fig. 6(b) shows an assembled state of the second guide plate. Fig. 6 shows an example of a series-parallel type heat equalizing apparatus. The number of the first guide plates 2 is eight, and a first channel injection port and a first channel discharge port corresponding to each first channel are arranged on two adjacent sides of each first guide plate. The second baffle comprises two end second baffles 3a and three middle second baffles 3 b. The end part second guide plate is provided with a fluid injection and discharge channel 4, a plurality of second channels which vertically extend are arranged in the end part second guide plate, the fluid injection and discharge channel is in fluid communication with all the second channels, and the side surface of the end part second guide plate is provided with a second channel discharge port or a second channel injection port corresponding to each second channel. A plurality of second channels which vertically extend are arranged in each middle second guide plate, and a plurality of second channel injection ports and a plurality of second channel discharge ports which are arranged along each second channel are respectively arranged on the side surface of each middle second guide plate. The number, position and size of the second channel injection ports on the first guide plate and the second guide plate which are correspondingly connected with each other correspond to the number, position and size of the first channel discharge ports, and the number, position and size of the second channel discharge ports correspond to the number, position and size of the first channel injection ports. The second guide plate is connected with the first guide plate to form an integral series-parallel connection fluid channel.

Fig. 7 is a schematic cross-sectional view of a first baffle according to the present invention, wherein fig. 7(a) - (c) show different cross-sectional shapes of the first channel, respectively. In fig. 7(a), the cross-sectional shape of the first passage 201 is square; in fig. 7(b), the cross-sectional shape of the first passage 201 is circular; in fig. 7(c), the cross-sectional shape of the first passage 201 is a diamond shape.

Fig. 8 is a schematic plan view of a first baffle according to the present invention, wherein fig. 8(a) - (f) show different arrangements of the first channel, respectively. In fig. 8(a) and 8(b), the first channel inlet 202 and the first channel outlet 203 of the first channel 201 are located on opposite sides of the first baffle 2, respectively, wherein in fig. 8(a), the first channel 201 extends along a straight line, and in fig. 8(b), the first channel 201 extends along a broken line. In fig. 8(c), the first channel injection port 202 of the first channel 201 is located at one side of the first baffle 2, the first channel discharge port 203 of the first channel 201 is located at the opposite sides of the first baffle 2, and the first channel 201 extends along a curve. In fig. 8(d) and 8(e), the first channel injection port 202 of the first channel 201 is located on two adjacent sides of the first baffle 2, and the first channel discharge port 203 of the first channel 201 is located on two other adjacent sides of the first baffle 2, wherein the first channel 201 extends along oblique lines in fig. 8(d), and the first channel 201 extends crosswise in a grid pattern in fig. 8 (e). In fig. 8(f), the first channel inlet 202 and the first channel outlet 203 of the first channel 201 are located on the same side of the first baffle 2, and the first channel 201 extends along a curve.

The specific embodiments of the present invention are not intended to be limiting of the invention. Those skilled in the art can make numerous possible variations and modifications to the present invention, or modify equivalent embodiments, using the methods and techniques disclosed above, without departing from the scope of the present invention. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention are still within the scope of the protection of the technical solution of the present invention, unless the contents of the technical solution of the present invention are departed.

Claims

1. A heat-equalizing bipolar battery stack is characterized by comprising n groups of electrode plates, wherein n is more than or equal to 2, the number of the electrode plates in each group of electrode plates is more than or equal to 2, the electrode plates are stacked in series up and down according to the order that electrode material layers with different polarities are oppositely arranged, an isolation layer is arranged between the adjacent electrode plates, an insulation sealing frame is arranged at the peripheral edge of each electrode plate, the heat-equalizing bipolar battery stack is provided with a heat equalizing device, the heat equalizing device comprises a first guide plate which is internally provided with a plurality of first channels and is made of an electronic conducting material and a second guide plate which is internally provided with a plurality of second channels and is made of an electronic insulating material, the first channels form a first channel injection port and a first channel discharge port on the side surface of the first guide plate, the second channels form a second channel injection port and a second channel discharge port on the side surface of the second guide plate, the n +1 first guide plates are respectively arranged between two adjacent groups of electrode plates in the n groups of electrode plates in the horizontal direction and are arranged on the upper side and the lower side of the whole n groups of electrode plates, the plurality of second guide plates are respectively arranged along the insulating sealing frames of one group or a plurality of groups of electrode plates in the vertical direction, the first guide plates and the second guide plates are mutually and fixedly connected to enable the plurality of first channels of the first guide plates and the plurality of second channels of the second guide plates to be respectively in fluid communication, so that the whole fluid channels are formed in the first channels of the plurality of first guide plates and the second channels of the plurality of second guide plates, and the fluid channels which are communicated in series, in parallel or in series and parallel can be formed through the arrangement of the second guide plates.

2. The thermally balanced bipolar battery stack of claim 1, wherein the second baffles comprise two end second baffles on which fluid injection and drainage channels are provided in fluid communication with the second channels in the end second baffles to deliver injected fluid to or drain fluid from the second channels of the end second baffles, the second channel drain of one of the end second baffles is in communication with the first channel injection port of the first baffle on the upper side of the first group of electrode tabs from the top of the thermally balanced bipolar battery stack, and the second channel injection port of the other of the end second baffles is in communication with the first channel drain of the first baffle on the lower side of the n-th group of electrode tabs, the second channel injection port of the nth middle second flow guide plate is in butt joint with the first channel discharge port of the first flow guide plate positioned on the upper side of the nth group of electrode plates from the top of the thermally balanced bipolar battery stack, and the second channel discharge port of the nth middle second flow guide plate is in butt joint with the first channel injection port of the first flow guide plate positioned on the lower side of the nth group of electrode plates, so that a serial fluid channel is formed among the n groups of electrode plates.

3. The thermally balanced bipolar battery stack of claim 1, wherein a fluid injection channel is provided in the second baffle, the fluid injection channel being in fluid communication with a second channel in the second baffle to deliver injected fluid to or exhaust fluid from the second channel of the second baffle, a second channel exhaust port of one of the second baffles being in abutment with the first channel input ports of all n +1 of the first baffles, and a second channel input port of another one of the second baffles being in abutment with the first channel exhaust ports of all n +1 of the first baffles, thereby forming parallel fluid channels between the n sets of electrode sheets.

4. The thermally balanced bipolar battery stack of claim 1, wherein the second baffles comprise two end second baffles and one or more middle second baffles, wherein a fluid injection channel is disposed on the end second baffles and is in fluid communication with the second channels in the end second baffles to deliver or exhaust injected fluid into the second channels of the end second baffles, wherein all of the first channel injection ports of the first baffles from the top, the bottom, and the middle of the m groups of electrode sheets of the thermally balanced bipolar battery stack are in butt joint with the second channel exhaust ports of one of the end second baffles, and wherein all of the first channel injection ports of the first baffles from the bottom of the thermally balanced bipolar battery stack are in butt joint with the second channel exhaust ports of the end second baffles, and wherein all of the first channel injection ports of the m groups of electrode sheets from the bottom of the thermally balanced bipolar battery stack are in butt joint with the upper side, the lower side, and the one or more middle second baffles from the bottom of the thermally balanced bipolar battery stack, The first channel outlets of all the first guide plates at the lower side and the middle part are in butt joint with the second channel inlets of the second guide plates at the other end part, each second guide plate at the middle part corresponds to 2m +1 groups of electrode plates, the second channel inlet of each second guide plate at the middle part is in butt joint with the first channel outlets of all the first guide plates at the upper side, the lower side and the middle part of m groups of electrode plates at the upper side, the second channel outlet of each second guide plate at the middle part is in butt joint with the first channel inlets of all the first guide plates at the upper side, the lower side and the middle part of m groups of electrode plates at the lower side, a plurality of second guide plates at the middle part are arranged on the side surface of the heat balance type bipolar battery stack in a staggered mode from the top of the heat balance type bipolar battery stack so as to form a fluid channel which is in series-parallel connection, and n >.

5. The thermally balanced bipolar battery stack of any one of claims 1 to 4, wherein a heat transfer fluid is injected into the fluid channel, such that the temperature of each set of electrode plates is kept uniform and each set of electrode plates can be cooled or heated, and the heat transfer fluid is one or a mixture of air, nitrogen, inert gas, water, ethylene glycol, a water and ethylene glycol mixed solution, an electrolyte, hydrocarbon heat transfer oil and silicon-based heat transfer oil.

6. The thermally balanced bipolar battery stack of any one of claims 1 to 4, wherein the extension path of the first channel is one or more of a straight line, a curved line, a broken line and a branch line, and the extension path of the second channel is one or more of a straight line, a curved line, a broken line and a branch line.

7. The thermally balanced bipolar battery stack of any of claims 1-4, wherein the first channel injection port and the first channel exhaust port are located on the same side, on opposite sides, or on adjacent sides of the first flow guide plate.

8. The thermally balanced bipolar battery stack of any of claims 1-4, wherein the first channel injection inlet can be located on one or more sides of the first flow guide plate and the first channel exhaust outlet can be located on one or more sides of the first flow guide plate.

9. The thermally balanced bipolar battery stack of any of claims 1-4, wherein the cross-sectional shape of the first channel is one or more of circular, elliptical, and polygonal, and the cross-sectional shape of the second channel is one or more of circular, elliptical, and polygonal.

10. The thermally balanced bipolar battery stack of any of claims 1-4, wherein the inner diameter of the first channel is a non-uniform sized inner diameter and the inner diameter of the second channel is a non-uniform sized inner diameter.