CN219144456U

CN219144456U - Battery pack

Info

Publication number: CN219144456U
Application number: CN202223024933.3U
Authority: CN
Inventors: 刘毅; 陈孟奇
Original assignee: Shaanxi Olympus Power Energy Co Ltd
Current assignee: Shaanxi Olympus Power Energy Co Ltd
Priority date: 2022-11-15
Filing date: 2022-11-15
Publication date: 2023-06-06
Anticipated expiration: 2032-11-15

Abstract

The utility model discloses a battery pack, which comprises a fixed component, a shared electrolyte component, a heat transfer component and a plurality of square batteries, wherein the square batteries are connected in parallel; the fixing assembly is used for fixedly connecting the square batteries side by side to form a battery pack; the shared pipeline assembly is used for completely penetrating the inner cavities of the square batteries so that all the square batteries in the battery pack are in an electrolyte system; and the heat transfer component is fixedly connected with the pole column on the same side of the square batteries so as to realize heat exchange between all the square batteries in the battery pack and the outside. The utility model can strengthen the uniformity of the electrolyte of each square battery in the battery pack, improve the cycle life, and can supplement the electrolyte for the battery pack through the shared pipeline assembly, thereby prolonging the service life of the battery pack; and meanwhile, the use safety of the battery pack is improved.

Description

Battery pack

Technical Field

The utility model relates to the technical field of batteries, in particular to a battery pack.

Background

At present, cylindrical batteries, square batteries and soft package batteries are connected in parallel or in series in the market to form a battery pack.

The utility model discloses a battery cell subassembly and group battery as in CN208078069U, the battery cell subassembly includes a plurality of electric cores, electrically conductive area, first utmost point ear and second ear, and is a plurality of the electric core sets up side by side, electrically conductive area with a plurality of the electric core is connected, with interval setting or adjacent two the electric core is established ties, first utmost point ear and second ear sets up in the same side of a plurality of electric cores that set up side by side, first utmost point ear passes through electrically conductive area with one the electric core is connected, second ear passes through electrically conductive area with another the electric core is connected.

The battery pack described above still has the following drawbacks:

after the battery pack is used for a period of time, electrolyte of each single battery has a certain degree of difference, the single battery with the least electrolyte amount or the least effective components becomes a short plate in a barrel effect, the whole service life of the battery pack is influenced, the problem of poor electrolyte uniformity can lead the internal resistance of each single battery to be inconsistent, and then the condition of inconsistent heating value of each single battery is caused, so that potential safety hazards exist. In order to solve the problem of inconsistent heat productivity of the battery pack, the existing heat dissipation mode of the battery pack is as follows: radiating the heat of the battery pack by arranging a liquid cooling circulation pipeline; but found through practical use: because the heat productivity of each single battery is not uniform, the heat dissipation effect needs to be ensured by increasing the flow path or the flow area of the liquid cooling medium in the liquid cooling circulation pipeline if the conventional heat dissipation mode is adopted, but the heat dissipation mode can cause the problems of large volume of the battery pack, complex manufacturing and assembling, multiple matched equipment, high cost and the like.

Therefore, how to weaken the adverse effect caused by the barrel effect to ensure the consistency of the single batteries in the existing battery pack, and solve the problems that the volume of the battery pack is large, the structure is complex, the manufacturing cost and the like are urgent to be solved at present in the existing liquid cooling heat dissipation mode.

Disclosure of Invention

In order to weaken adverse effects caused by the barrel effect to ensure consistency of single batteries in the existing battery pack and solve the problems of large battery pack volume, complex structure, manufacturing cost and the like caused by the existing liquid cooling heat dissipation mode at the same time, the utility model adopts a technical scheme that the battery pack comprises a fixed component, a shared pipeline component, a heat transfer component and a plurality of square batteries, wherein the square batteries are connected in parallel; the fixing assembly is used for fixedly connecting the square batteries side by side to form a battery pack; the shared pipeline assembly is used for completely penetrating the inner cavities of the square batteries so that all the square batteries in the battery pack are in an electrolyte system; and the heat transfer component is fixedly connected with the pole column on the same side of the square batteries so as to realize heat exchange between all the square batteries in the battery pack and the outside.

According to the utility model, the square batteries in the battery pack are connected in parallel and fixed through the fixing assembly to form the battery pack, and meanwhile, the shared pipeline assembly is arranged, so that all square batteries in the battery pack are in the same electrolyte system, adverse effects caused by a wooden barrel effect are weakened, the uniformity of electrolyte of each square battery in the battery pack is ensured, and the cycle life is prolonged;

meanwhile, the uniformity is improved, the difference of the heating values of the single batteries is reduced, so that the single batteries can basically maintain balanced heating, and the probability of thermal runaway caused by overlarge heating value of the individual batteries is reduced.

In addition, the shared pipeline component can also supplement electrolyte for the battery pack, so that the service life of the battery pack is further prolonged.

Furthermore, as the single batteries basically maintain the state of balanced heating, the utility model adopts the mode that the heat transfer component is connected with the single battery poles to transfer the heat of the poles with the most concentrated heat on the single batteries to the outside for heat dissipation, and the heat dissipation mode not only realizes balanced heat dissipation of the single batteries in the battery pack and improves the use safety of the battery pack, but also has simple structure, easy manufacture and assembly and low manufacture cost.

Preferably, the shared pipeline assembly comprises a liquid injection pipeline, the square battery comprises a liquid injection channel, and the liquid injection channel is provided with a sealing mechanism; each square battery is communicated with the liquid injection pipeline through a liquid injection channel; one end of the liquid injection pipeline is used as a total liquid injection port, and the other end is closed; the sealing mechanism is used for sealing the liquid injection channel, and the sealing mechanism is dissolved when meeting electrolyte or forms an opening under the action of external force, so that the liquid injection channel is communicated, and the liquid injection pipeline is communicated with the electrolyte cavity of the square battery. The arrangement of the liquid injection pipeline and the sealing mechanism ensures that the electrode assembly in each square battery is kept not to contact with air before the battery pack forms a shared electrolyte system, and each square battery can be firstly divided into volumes before the battery pack is formed, and the square batteries with good consistency are used for forming the battery pack. When the battery pack is formed, the sealing mechanism is removed when the electrolyte is required to be injected, and then the electrolyte is injected uniformly, so that the performance of the battery pack is better.

Preferably, the liquid injection pipeline comprises a plurality of collecting pipes and a plurality of connecting pipes; the collection pipes are respectively arranged on each square battery shell, and each collection pipe is paved along the thickness direction or the width direction of each square battery shell; and the collecting pipes on the two adjacent square batteries are connected through a connecting pipe. The collection pipe and the shell are integrally designed and are connected through the connecting pipe, so that the square battery shell and the battery pack formed by the square battery shell are simple and convenient to process, economical and practical, and good in sealing effect.

Preferably, the two ends of the connecting pipe comprise connecting nozzles, the two ends of the collecting pipe are provided with connecting ports, and the connecting nozzles are embedded in the connecting ports for sealing connection; or the two ends of the connecting pipe comprise connecting ports, the two ends of the collecting pipe are provided with connecting nozzles, and the connecting nozzles are embedded in the connecting ports for sealing connection. The arrangement of the connecting nozzle and the connecting port enables the splicing of the collecting pipe and the connecting pipe to be simpler and more convenient, and the square batteries can be tightly arranged, so that the volume of the battery pack is reduced.

Preferably, the connecting nozzle is a conical nozzle, and the connecting nozzle is in interference fit with the connecting port; or the connecting nozzle is in threaded connection with the connecting port. The conical mouth can be better spliced with the connecting port, the air tightness of the shared pipeline assembly can be improved through interference fit, the threaded connection is convenient to install, the cost is low, and the air tightness is good.

Preferably, a detachable explosion venting mechanism is arranged on the total liquid injection port of the liquid injection pipeline, and the closed end of the liquid injection pipeline is sealed by a plugging piece. The arrangement of the explosion venting mechanism can enable the shared pipeline assembly to be used as an explosion venting channel at the same time, and when any square battery is subject to thermal runaway, the shared electrolyte channel is used as the explosion venting channel, and the thermal runaway flue gas is discharged through the explosion venting mechanism.

Preferably, the sealing mechanism is a sealing sheet provided with a traction ring, and the traction ring tears the sealing sheet to form an opening under the traction of external force; or the sealing mechanism is a sealing film with a protective film, the sealing film is dissolved in electrolyte, the protective film is insoluble in electrolyte, the protective film is attached to one side of the sealing film facing the inner cavity of the square battery, and the protective film falls off along with the sealing film after the sealing film is dissolved in the electrolyte. The sealing mechanism can be opened by external force or dissolved by electrolyte, both modes can meet the requirements of steps such as assembly, formation, capacity division and the like when a single square battery is manufactured, and the sealing mechanism is convenient and simple to open when a battery pack is formed.

Preferably, the battery pack is further provided with a heat transfer tube, the pole is provided with a through groove, and the heat transfer tube is fixed in the through groove. The pole is the place where square battery generates heat most obviously, the through groove is arranged on the pole, and the heat transfer pipe is arranged in the through groove, so that the heat of the pole can be effectively reduced through temperature control equipment, the battery pack can be heated when the temperature of the battery pack is low, and the safety and the operation stability of the battery pack are improved.

Preferably, the cross section of the through groove is C-shaped or U-shaped; the ratio of the diameter of the heat transfer tube to the widest part of the through groove is 1:1.05-1:1.1; the ratio of the length of the through groove to the width of the upper cover plate of the square battery is 0.7:1-0.9:1. The radian formed at the two ends of the C-shaped through groove has natural tension, which is beneficial to tightly clamping the heat transfer tube in the through groove; the opening width of the U-shaped through groove is relatively close to the widest part of the through groove, so that the heat transfer pipe can be conveniently placed, and enough operation space can be provided to enable the special tool to level the heat transfer pipe or attach the heat transfer pipe to the through groove more tightly.

Preferably, the square battery shell comprises an upper cover plate, a lower cover plate and a cylinder body, wherein the pole is arranged on the upper cover plate in an insulating manner, and the lower cover plate and the collecting pipe are integrally formed aluminum extrusion parts; the cylinder body is an aluminum extrusion piece; the lower cover plate is fixed with the cylinder body through laser welding. The extrusion process has low cost and good sealing effect of the welding and fixing process.

Preferably, the fixing component is a fixing shell, and the square batteries are fixedly arranged in the fixing shell side by side; or the fixing component comprises an assembling strip and an assembling base, wherein the assembling strip is fixedly connected with the side wall of the cylinder of the square battery and is used for fixing a plurality of square batteries placed side by side into a whole; the assembly base is located below a plurality of square batteries placed side by side and fixedly connected with a lower cover plate of the square batteries.

Additional advantages, objects, and features of the utility model will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the utility model.

Drawings

In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic view of a battery pack according to an embodiment;

fig. 2 is a schematic view of a battery pack according to an embodiment.

FIG. 3 is a schematic view of the structure of a battery case in one embodiment;

fig. 4 is a schematic view of the structure of a battery case in one embodiment;

FIG. 5a is a schematic cross-sectional view of a lower cover plate of a battery case according to one embodiment;

FIG. 5b is a schematic cross-sectional view of a lower cover plate of a battery case according to one embodiment;

FIG. 6 is a schematic view of a battery housing and a connector according to one embodiment;

fig. 7a is a schematic view of a battery case and a sealing film according to an embodiment

FIG. 7b is a schematic cross-sectional view of a battery housing and a sealing membrane according to one embodiment;

FIG. 7c is a schematic cross-sectional view of a lower cover plate and a sealing film according to one embodiment;

FIG. 7d is a schematic cross-sectional view of the lower cover plate and the sealing film according to one embodiment;

fig. 8a is a schematic view of the structure of a battery case and a sealing plate in one embodiment;

FIG. 8b is a schematic cross-sectional view of a battery housing and a sealing plate according to one embodiment;

FIG. 9 is a schematic view of a pole in one embodiment;

FIG. 10 is a schematic view of an embodiment of an upper cover plate and post assembly;

FIG. 11 is a schematic diagram of a structure of a plurality of poles and a conductive connecting base after fixing in an embodiment;

FIG. 12 is a schematic illustration of a dimension definition of a pole in one embodiment;

FIG. 13 is a schematic illustration of the dimensional definition of the upper cover plate and pole in one embodiment;

reference numerals:

100-square battery

200-fixation assembly

201-Assembly strip

202-assembled base

300-shared pipeline assembly

400-heat transfer assembly

1-upper cover plate

12-first insulating member

13-second insulator

2-lower cover plate

21-first through hole

3-barrel

31-first battery mount

32-second battery mount

33-radiating groove

34-reinforcing rib

4-manifold

41-connection port

42-second through hole

43-explosion venting assembly

5-pole

50-through groove

51-first end face

511-first region

512-second region

52-second end face

53-sidewall

54-conductive connecting seat

6-heat transfer tube

7-connecting pipe

71-connecting nozzle

81-sealing film

82-sealing sheet

821-traction ring

9-electrical connector

Detailed Description

Although embodiments of the utility model have been disclosed above, they are not limited to the use listed in the specification and embodiments. It can be applied to various fields suitable for the present utility model. Additional modifications will readily occur to those skilled in the art. Therefore, the utility model is not to be limited to the specific details and illustrations shown and described herein, without departing from the general concepts defined in the claims and their equivalents.

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.

Hereinafter, a battery pack of the present application is specifically disclosed with reference to the accompanying drawings as appropriate. However, unnecessary detailed description may be omitted. For example, detailed descriptions of well-known matters and repeated descriptions of the actual same structure may be omitted. This is to avoid that the following description becomes unnecessarily lengthy, facilitating the understanding of those skilled in the art. Furthermore, the drawings and the following description are provided for a full understanding of the present application by those skilled in the art, and are not intended to limit the subject matter recited in the claims.

All embodiments and alternative embodiments of the present application may be combined with each other to form new solutions, unless specifically stated otherwise. All technical features and optional technical features of the present application may be combined with each other to form new technical solutions, unless specified otherwise.

Reference herein to "comprising" and "including" means open ended, as well as closed ended, unless otherwise noted. For example, "comprising" and "including" may mean that other components not listed may also be included or included, or that only listed components may be included or included.

It is further understood that the terms "first," "second," and the like, are merely used to distinguish one entity or action from another entity or action and do not necessarily require or imply any actual relationship or order between such entities or actions.

The utility model provides a battery pack, the basic structure of which is shown in figure 1, the battery pack comprises a plurality of square batteries 100, a fixing assembly 200, a shared pipeline assembly 300 and a heat transfer assembly 400, wherein the square batteries 100 are connected in parallel; the fixing assembly 200 is used for fixedly connecting a plurality of square batteries 10 side by side to form a battery pack; the shared pipeline assembly 300 is used for completely penetrating the inner cavities of the square batteries 10 so that all the square batteries 100 in the battery pack are in one electrolyte system; the heat transfer assembly 400 is fixedly connected with the poles on the same side of the plurality of prismatic batteries 100, so as to realize heat exchange between all the prismatic batteries 100 in the battery pack and the outside.

According to the utility model, the plurality of square batteries in the battery pack are connected in parallel and fixed through the fixing assembly to form the battery pack, and meanwhile, the sharing pipeline is arranged, so that all square batteries in the battery pack are in the same electrolyte system, the uniformity of electrolyte of each square battery in the battery pack can be enhanced, the cycle life is prolonged, and the electrolyte can be replaced or supplemented for the battery pack through the sharing pipeline assembly, so that the service life of the battery pack is prolonged; the heat transfer assembly can control the temperature of the battery pack by connecting with the temperature control device, so that the use safety of the battery pack is improved.

As shown in fig. 1 and 2, the specific structure of the fixing assembly 200 in this embodiment is as follows: the assembly comprises an assembly strip 201 and an assembly base 202, wherein the assembly strip 201 is fixedly connected with the side wall of a cylinder of the square battery 100 and is used for fixing a plurality of square batteries 100 which are arranged side by side into a whole; the assembly base 202 is located below a plurality of prismatic batteries 100 placed side by side and fixedly connected with the lower cover plate 2 of the prismatic batteries 100. In some embodiments, the fixing component may also be a fixing housing, and the plurality of square batteries are fixedly arranged in the fixing housing side by side.

As shown in fig. 2, specifically, the structure of the shared piping assembly 300 in this embodiment is as follows: comprises a liquid injection pipeline. Each square battery 100 is communicated with the liquid injection pipeline through one liquid injection channel of the square battery; one end of the liquid injection pipeline is used as a total liquid injection port, and the other end is closed; the square battery comprises a sealing mechanism, wherein the sealing mechanism is arranged at the liquid injection channel of the square battery 100 and is used for sealing the square battery 100, and the sealing mechanism is dissolved when encountering electrolyte or forms an opening under the action of external force, so that the liquid injection channel is communicated, and the liquid injection pipeline is communicated with the electrolyte cavity of the square battery. The arrangement of the liquid injection pipeline and the sealing mechanism ensures that the inner cavity of each square battery is kept sealed before the battery pack forms a shared electrolyte system, the electrode assembly, the electrolyte and the like are not contacted with air, and the sealing mechanism is removed and then the electrolyte is injected uniformly when the liquid injection sharing is needed.

Referring to fig. 1, the heat transfer assembly 400 in this embodiment may take the following two forms:

the heat transfer component is a heat transfer pipe, the heat transfer pipe can be a heat pipe, a copper pipe, an aluminum pipe, a ceramic pipe and the like, and the heat transfer pipe is connected with the pole column positioned on the same side in the battery pack, so that heat concentrated on each square shell battery pole column is conducted out for heat exchange, and the heat transfer pipe is insulated from the pole column or an external heat exchange device when insulation is needed, so that the normal operation of the battery pack is ensured.

The heat transfer component can also directly adopt a water cooling pipe as the heat transfer component, the water cooling pipe is insulated with the polar columns, and the water cooling pipe is connected with the polar columns positioned at the same side in the battery pack, so that the heat concentrated on the polar columns of each square-shell battery is conducted out for heat exchange.

For a more detailed description of the shared conduit assembly and the heat transfer assembly, the following description will be made based on prismatic cells that make up the battery pack:

1. shared pipeline assembly

As shown in fig. 3 and 4, the square battery of the present embodiment is formed by enclosing an upper cover plate 1, a lower cover plate 2 and a cylinder 3, wherein a pole 5 is provided on the upper cover plate 1, and a collecting pipe 4 is provided on the lower cover plate 2.

As shown in fig. 5a and 5b, the lower cover plate 2 is provided with a first through hole 21, and a manifold 4 covering the first through hole 21 and extending in the width direction of the lower cover plate is further provided, and the manifold 4 is provided with a second through hole 42, the first through hole 21 penetrating the second through hole 42. As shown in fig. 5a, the first through hole 21 and the second through hole 42 may be circular holes, or may be elongated through holes as shown in fig. 5 b. In some embodiments, the manifold 4 is integrally designed with the lower cover plate 2, and the first through hole and the second through hole form a liquid injection channel.

In some embodiments, the manifold is disposed on the can of the prismatic cell and extends along the length or width of the lower cover plate.

In some embodiments, the manifold is disposed on the lower cover plate of the prismatic cell and extends along the length of the lower cover plate.

In some embodiments, when the square battery forms a battery pack without sharing electrolyte, the collecting pipe 4 is spliced to form a through liquid injection pipeline which can be used as an explosion venting channel of the battery pack, one end of the explosion venting channel is provided with a blocking piece, and the other end of the explosion venting channel is used as an outlet of flue gas. When thermal runaway happens to any square battery, the thermal runaway flue gas in the square battery is discharged to the explosion venting channel through the liquid injection channel and is discharged through a flue gas outlet of the explosion venting channel, and the thermal runaway flue gas can be cooled and adsorbed or ignited by the flue gas outlet to the flue gas treatment device.

In some embodiments, the connecting pipe 4 is spliced to form a through liquid injection pipeline which can be used as an electrolyte sharing channel of the battery pack, one end of the connecting pipe is provided with a sealing piece to seal the electrolyte sharing channel, the other end of the connecting pipe is provided with a detachable liquid injection mechanism to replace a detachable explosion venting component, electrolyte injected through the liquid injection mechanism enters the battery shell through the liquid injection channel, so that all square batteries in the battery pack are in a unified electrolyte environment, and the uniformity of electrolyte in the battery pack can be effectively improved. When electrolyte sharing is completed, the liquid injection mechanism is replaced by the explosion venting assembly, and in the battery operation process, when thermal runaway occurs in any square battery, the liquid injection pipeline can still be used as an explosion venting channel.

In addition, in the use, this sharing pipeline subassembly can also be used for giving group battery fluid replacement, trades liquid, when the group battery uses more than certain age limit, when electrolyte will take place to lose, draws out and renew new electrolyte or directly supply new electrolyte and all help prolonging the life of group battery. After the liquid injection is completed, the explosion venting assembly is reinstalled to be used for discharging the thermal runaway flue gas.

As shown in fig. 6, in some embodiments, the filler pipe comprises several collecting pipes 4 and several connecting pipes 7; the plurality of collecting pipes 4 are respectively arranged on the shell of each square battery 10, and each collecting pipe is paved along the thickness direction or the width direction of the shell of the square battery 100; the collecting pipes 4 on two adjacent square batteries 100 are connected through a connecting pipe 7. The manifold is designed with the square battery 10 shell integrally and is connected with the square battery 10 shell through the connecting pipe, so that the square battery shell is simple and convenient to process, economical and practical, and good in sealing effect.

The collecting pipes 4 are fixedly connected through connecting pipes 7 to form an explosion venting channel and/or an electrolyte sharing channel. The external dimensions of the connecting pipe 7 are comparable to those of the manifolds 4, which contributes to the stability of the connection between the manifolds 4. Preferably, the connecting pipe 7 comprises two connecting nozzles 71, two ends of the collecting pipe 4 are provided with connecting ports 41, and the connecting nozzles 71 are embedded in the connecting ports 41 for sealing connection; or the connecting pipe comprises two connecting ports, connecting nozzles are arranged at two ends of the collecting pipe, and the connecting nozzles are embedded in the connecting ports for sealing connection. The connecting nozzle is preferably slightly conical in shape, is convenient to insert into the connecting port, is in interference fit with the connecting port, is riveted with the connecting port, and can be further added with adhesives such as epoxy glue and the like on the riveting surface during riveting, so that the sealing and fixing effects are better, or the connecting nozzle is in threaded connection with the connecting port.

As shown in fig. 7a to 7d, a sealing film 81 is provided on the pouring channel. The sealing film 81 has two use conditions, and is used as an explosion venting film, and when the square battery is in thermal runaway, the thermal runaway smoke enters an explosion venting channel formed by the collecting pipe 4 after bursting or melting the sealing film 81.

When the electrolyte is used as a liquid injection sealing film, the sealing film 81 can be dissolved when meeting electrolyte, the inner cavity of the square-shell battery can be kept isolated from the outside air before the square-shell battery forms a shared electrolyte system, and a layer of protective film is attached to one side of the sealing film 81 facing the inside of the shell, so that the electrolyte in the battery is prevented from dissolving the sealing film 81 in advance. When electrolyte is required to be injected, the electrolyte enters the electrolyte sharing channel formed by the collecting pipe 4, and after the sealing film 81 is dissolved by the electrolyte, the protective film attached to the sealing film is also fallen off, so that the electrolyte can enter the battery shell, and the effect that the electrolytes of all square batteries in the battery pack are mutually communicated is achieved. The mode avoids using other tools, has low requirements on the operation environment, and can ensure that the electrolyte and the electrode assembly are not exposed to the air by only timely sealing the electrolyte sharing channel after the electrolyte is injected.

As shown in fig. 8a and 8b, a sealing plate 82 is disposed on the liquid injection channel, and a traction ring 821 is disposed on the sealing plate 82, when the battery pack is assembled, the traction ring 821 is threaded by a traction wire, before liquid injection, the sealing plate 82 of each square battery is torn by pulling the traction wire threaded by all the traction rings 821, so that all the square batteries form openings, and the electrolyte is injected into all the square batteries uniformly, thereby achieving the effect of mutual communication of the electrolytes of all the square batteries in the battery pack. This operation should be accomplished in a vacuum environment to avoid exposing the battery assembly to air.

2. Heat transfer assembly

Referring to fig. 1, in the present embodiment, the heat transfer assembly 400 adopts a heat transfer tube, and the post of the square-shell battery is provided with a through groove, and the heat transfer tube is clamped in the groove of the post, so that the heat concentrated on the post of each square-shell battery is conducted out for heat exchange.

In order to make the heat transfer effect better, the embodiment also specifically designs the structure of the through groove formed on the pole: as shown in fig. 9 and 10, the pole 5 in this embodiment is a cylindrical body, and the cylindrical body includes a first end face 51, a second end face 52 and a side wall 53, and at least one through groove 50 is disposed on the first end face 51 or the side wall 53 to mount the heat transfer tube, i.e. an opening of the through groove 50 is located on the first end face 51 or the side wall 53. The first end face 51 is provided with an electrical connection region, and the second end face 52 is provided with a conductive connection holder 54 to be electrically connected with the electrode assembly in the square-case battery case.

As shown in fig. 10, in this embodiment, the pole 5 is fixed on the upper cover 1 of the square battery, and in order to insulate the pole from the upper cover 1, a first insulating member 12 and a second insulating member 13 are further provided, the first insulating member 12 is disposed on the upper cover 1, the second insulating member 13 is disposed under the upper cover 1, and the pole 5 sequentially passes through the second insulating member 13, the upper cover 1 and the first insulating member 12 and then is fixed on the upper cover 1.

As shown in fig. 10, the conductive connecting seat 54 is specifically a conductive connecting sheet in this embodiment, and has a thickness of 2-3mm and a rectangular shape, and may be configured in different shapes according to different requirements. The conductive connection seats of the positive pole and the negative pole are made of different materials, for example, the positive pole is made of aluminum sheet, the negative pole is made of copper sheet, the conductive connection seat 54 and the positive pole can be integrally formed, and the conductive connection seat and the negative pole are welded or clamped and fixed, and the specific fixing mode is different according to the different materials selected by the pole or the conductive connection sheet. And a layer of copper sheet is added on the integrally formed pole post and conductive connecting sheet which are made of aluminum material to serve as the conductive connecting sheet of the negative pole post.

Fig. 11 and 12 are schematic structural views of the connection between the posts and the conductive connection base in various structures in this embodiment. As shown in the schematic structural diagram of the pole a and the pole b in fig. 12, the height of the pole is h1, the distance from the lowest position of the through slot to the second end face 52 is h2, the widest position of the through slot is h3, and the depth of the through slot is h4. In various embodiments, the through slots 50 have a C-shaped or U-shaped cross-section. As shown in fig. 11, the structural schematic diagrams of the pole a, the pole b, the pole C, the pole d, the pole n, the pole p, the pole q and the pole r are through grooves with C-shaped cross sections, the opening width of each through groove is smaller than the widest h3 of each through groove, the interference clamping of the heat transfer tube in the through groove 50 is facilitated, and the radian formed at two ends of each through groove with C-shaped cross groove has natural tension, so that the heat transfer tube is tightly clamped in the through groove. The schematic structural diagrams of the pole e, the pole f, the pole g and the pole m shown in fig. 11 are through grooves with U-shaped cross sections, the width of the opening of each through groove is slightly smaller than the widest h3 of each through groove, so that the heat transfer pipe can be conveniently placed, and enough operation space can be provided for a special tool to level the heat transfer pipe or attach the heat transfer pipe to the through groove more tightly.

As shown in the schematic structural diagrams of the pole b, the pole d, the pole e, the pole g and the pole q in fig. 11, the through groove 50 may be disposed on the first end surface 51 of the pole, where part or all of the first end surface 51 except for the opening of the through groove is used as an electrical connection area for connecting the pole plates. As shown in fig. 11, the structures of the poles a, c, f, m, n and p are schematic, and the through grooves 50 can be disposed on the side walls 53 of the poles, where the first end faces 51 are all used as electrical connection areas for connecting the pole plates. As shown in the schematic structure of the pole n and the pole p in fig. 11, when the opening of the through slot 50 is located on the side wall 53, two through slots may be simultaneously disposed on the side wall of the pole, so as to increase the number of the heat transfer tubes and improve the heat transfer efficiency of the pole.

The area of the electrical connection region is too small such that the current carrying area of the post becomes small, which may raise the temperature of the post, and in some embodiments, the first end portion acts as an electrical connection region, with the through slot 50 being eccentrically positioned in order to increase the area of the electrical connection region. As shown in the schematic structure of the pole r in fig. 11, the through groove 50 divides the first end face into a first region 511 and a second region 512, the first region 511 is an electrical connection region, and the area ratio of the first region 511 to the first end face is not less than 50%. The design can facilitate electric connection, effectively increase the area of an electric connection area and improve the current carrying area. The area of the first end face includes a part of the area missing due to the through-slot opening, that is, the area of the first end face is equal to the area of the second end face.

As shown in the schematic structural diagrams of the pole a, the pole c, the pole q, and the pole r in fig. 11, the horizontal section of the pole may be circular, rectangular, or racetrack, and different shapes may be selected according to different battery types, or other different shapes, which is not exhaustive in this embodiment.

As shown in fig. 12, which is a schematic illustration of the dimension definition of the electrode post in this embodiment, the second end face 52 of the electrode post is close to the electrode assembly, so that the second end face 52 is closer to the electrode assembly inside the battery, and the heat transfer tube should be disposed as close to the second end face 52 as possible. In order to adapt to most of the commonly used square-shell batteries in the market, the height h1 of the pole in the embodiment is 20mm-25mm, and the distance h2 between the lowest part of the through groove and the second end surface 52 of the pole is 7-12 mm. The heat transfer tube is not tightly contacted when the diameter of the heat transfer tube is smaller than that of the through groove, and the heat transfer tube is difficult to install when the diameter of the heat transfer tube is larger than that of the through groove, so that the ratio of the diameter of the heat transfer tube to the widest part h3 of the through groove is 1:1.05-1:1.1. For example, the diameter of the heat transfer pipe is phi 10, the diameter of the heat transfer pipe is 10mm, and the widest part h3 of the through groove is 10.5-11 mm, so that the heat transfer pipe is convenient to be placed in the barrel groove, and then the heat transfer pipe is tightly pressed and tightly attached to the through groove, thereby improving the heat transfer efficiency.

In some embodiments, as shown in the schematic structure of the post b in fig. 12, the depth h4 of the through groove is smaller than the diameter of the heat transfer tube, so that the heat transfer tube protrudes slightly from the surface of the post, which is advantageous for compacting and leveling the heat transfer tube to be in close contact with the through groove.

In some embodiments, an insulating layer is arranged on the surface of the through groove, and an insulating material, a silica gel layer, a rubber layer and the like can be coated, or an insulating layer can be arranged on the heat transfer tube, so that the heat transfer tube made of metal material and the pole are installed in an insulating manner.

According to the utility model, the through grooves are formed in the pole, so that the heat transfer pipe is arranged in the through grooves, the temperature inside the pole and the battery can be effectively controlled, the electric connection area is further arranged on the first end face of the pole, and the pole plates can be arranged on the electric connection area to realize series connection or parallel connection of a plurality of square batteries.

The following structure of the groove and the heat transfer tube is formed on the post of the battery with the opposite shell, and after the heat tube and the TEC refrigerator are cooled in the battery charging and discharging process at 20+/-5 ℃, various performance parameters of the battery are summarized and analyzed:

as shown in table 1, in connection with fig. 12, the part marked with h2 is the distance between the deepest part of the groove and the second end face, and after the heat transfer tube is placed, the temperature of the battery and the temperature of the pole are tested by using the thermometer, so that the temperature of the pole and the temperature of the shell of the battery are changed correspondingly along with the change of the value of h 2. When h2 is less than 7mm, the space for installing the heat transfer pipe is insufficient after the assembly of the pole and the upper cover assembly is completed, and when h2 is greater than or equal to 13mm, the temperature of the pole is reduced compared with that of the pole without using the embodiment, but the temperature of the battery is not reduced continuously. Along with the increase of the value of h2, the temperature of the pole is not higher than 34 ℃ in the interval of 7-12mm, the temperature measured on the surface of the battery shell is also about 36 ℃, the temperature of the pole is reduced by 19.2% at least compared with the temperature of the battery of the conventional square battery pole in the market, the temperature of the surface of the battery shell is reduced by 4.7% at least, the temperature of the whole battery is effectively reduced, the temperature of the pole is obviously reduced, and the safety performance is greatly improved.

TABLE 1 cell post and cell case surface temperatures under different sized through slots

As shown in table 2, with reference to fig. 13, the ratio of the length h5 of the through groove to the width h6 of the cover plate has a large influence on the temperature of the battery post, and when h2 is fixed to 7mm, the larger the bonding area of the heat transfer pipe and the post is, the better the heat transfer and heat dissipation effects are, but the longest cannot exceed the width of the cover plate. After testing the temperature of the pole when the through grooves with different lengths are charged and discharged in the battery 1C, compared with the pole of a conventional square battery in the market, the temperature of the surface of the pole is reduced by 20.2%, the temperature of the pole is obviously reduced, the safety performance is greatly improved, the ratio of the length h5 of the through groove to the width h6 of the cover plate is preferably 0.7:1 to 0.9:1, and the cooling effect is good, energy conservation and environmental protection.

h5：h6	Comparative example	0.5:1	0.6:1	0.7:1	0.8:1	0.9:1
							Post temperature (DEG C)	42	33.5	32.6	31.1	30.4	29.8

TABLE 2 surface temperatures of battery post under different sized through slots

The square-shell battery of this embodiment also has the following optimization design:

as shown in fig. 3 and 4, in order to ensure that the square battery is conveniently connected with the fixing assembly, the lower cover plate 2 is further provided with a first battery mounting seat 31 along the width direction thereof for connection with the assembly base 202; the barrel sidewall is also provided with a second battery mount 32 along its height for connection with the assembly bar 201.

The outer surface of the cylinder 3 is provided with a plurality of heat dissipation grooves 33 extending in the height direction thereof so as to facilitate heat dissipation for the battery case.

The cylinder 3 is further provided with a plurality of reinforcing ribs 34 extending in the height direction thereof to improve the compressive strength of the cylinder. The lower cover plate 2 and the collecting pipe 4 are integrally formed aluminum extrusion parts. The cylinder body 3 is also an aluminum extrusion piece, the upper cover plate 1, the lower cover plate 2 and the cylinder body 3 are fixed by laser welding, and the fixing mode is economical, convenient and good in effect.

In this embodiment, as shown in fig. 1 and 2, the battery packs are further provided with electrical connectors 9 that connect adjacent two battery packs in series.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the embodiments, and are intended to be included within the scope of the claims and description. In particular, the technical features mentioned in the respective embodiments may be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.

Claims

1. A battery pack is characterized by comprising a fixed component, a shared pipeline component, a heat transfer component and a plurality of square batteries,

the square batteries are connected in parallel;

the fixing assembly is used for fixedly connecting the square batteries side by side to form a battery pack;

the shared pipeline assembly is used for completely penetrating the inner cavities of the square batteries so that all the square batteries in the battery pack are in an electrolyte system;

and the heat transfer component is fixedly connected with the pole column on the same side of the square batteries so as to realize heat exchange between all the square batteries in the battery pack and the outside.

2. The battery of claim 1, wherein the shared line assembly comprises a fill line, the prismatic cell comprising a fill channel, the fill channel being provided with a sealing mechanism;

each square battery is communicated with the liquid injection pipeline through a liquid injection channel; one end of the liquid injection pipeline is used as a total liquid injection port, and the other end is closed; the sealing mechanism is used for sealing the liquid injection channel, and the sealing mechanism is dissolved when meeting electrolyte or forms an opening under the action of external force, so that the liquid injection channel is communicated, and the liquid injection pipeline is communicated with the electrolyte cavity of the square battery.

3. The battery of claim 2, wherein the fill line comprises a plurality of manifolds and a plurality of connecting tubes;

the collection pipes are respectively arranged on each square battery shell, and each collection pipe is paved along the thickness direction or the width direction of each square battery shell;

and the collecting pipes on the two adjacent square batteries are connected through a connecting pipe.

4. The battery pack according to claim 3, wherein the two ends of the connecting pipe comprise connecting nozzles, the two ends of the collecting pipe are provided with connecting ports, and the connecting nozzles are embedded in the connecting ports for sealing connection; or (b)

The connecting pipe both ends include the connector, the collecting pipe both ends set up the connecting nozzle, the connecting nozzle inlay in sealing connection in the connector.

5. The battery pack of claim 4, wherein the connection nozzle is a tapered nozzle, the connection nozzle being in interference fit with the connection port; or (b)

The connecting nozzle is in threaded connection with the connecting port.

6. The battery pack according to any one of claims 2-5, wherein a detachable explosion venting mechanism is arranged on a total liquid injection port of the liquid injection pipeline, and a sealing piece is used for sealing a closed end of the liquid injection pipeline.

7. The battery pack according to claim 2, wherein the sealing mechanism is a sealing sheet provided with a traction ring, and the traction ring tears the sealing sheet to form an opening under traction of an external force;

or (b)

The sealing mechanism is a sealing film with a protective film, the sealing film is dissolved in electrolyte, the protective film is insoluble in electrolyte, the protective film is attached to one side of the sealing film facing the inner cavity of the square battery, and the protective film falls off along with the sealing film after the sealing film is dissolved in the electrolyte.

8. The battery of claim 1, wherein the battery is further provided with a heat transfer tube, the post is provided with a through slot, and the heat transfer tube is secured within the through slot.

9. The battery pack according to claim 8, wherein the cross section of the through groove is C-shaped or U-shaped; the ratio of the diameter of the heat transfer tube to the widest part of the through groove is 1:1.05-1:1.1; the ratio of the length of the through groove to the width of the upper cover plate of the square battery is 0.7:1-0.9:1.

10. The battery pack of claim 3, wherein the prismatic battery housing comprises an upper cover plate, a lower cover plate and a cylinder, the pole is arranged on the upper cover plate in an insulating manner, and the lower cover plate and the collecting pipe are integrally formed aluminum extrusion parts; the cylinder body is an aluminum extrusion piece; the lower cover plate is fixed with the cylinder body through laser welding.

11. The battery pack according to claim 1, wherein the fixing component is a fixing housing, and a plurality of square batteries are fixedly arranged in the fixing housing side by side; or (b)

The fixing component comprises an assembling strip and an assembling base, wherein the assembling strip is fixedly connected with the side wall of the cylinder of the square battery and is used for fixing a plurality of square batteries placed side by side into a whole;

the assembly base is located below a plurality of square batteries placed side by side and fixedly connected with a lower cover plate of the square batteries.