WO2023169395A1

WO2023169395A1 - High-capacity battery pack

Info

Publication number: WO2023169395A1
Application number: PCT/CN2023/080007
Authority: WO
Inventors: 雷政军; 张三学; 韩晓宇; 强健; 翟腾飞; 李鹏
Original assignee: 陕西奥林波斯电力能源有限责任公司
Priority date: 2022-03-09
Filing date: 2023-03-07
Publication date: 2023-09-14

Abstract

The present application provides a high-capacity battery pack, comprising at least two high-capacity batteries. Each high-capacity battery comprises a shell, a battery cell group arranged in the shell, and lid plates located on two opposite sides of the shell. The lid plates comprise a first lid plate and a second lid plate, wherein the first lid plate is a positive terminal of the high-capacity battery, and the second cover plate is a negative terminal of the high-capacity battery; a positive electrode of the battery cell group is electrically connected to the first lid plate, and a negative electrode of the battery cell group is electrically connected to the second lid plate; and adjacent high-capacity batteries are electrically connected to each other by means of the first lid plate and the second lid plate. Adjacent high-capacity batteries in the high-capacity battery pack are electrically connected to each other by means of the first lid plate and the second lid plate, and by means of such a manner of connection, the high-capacity battery pack has a simple structure, a good overcurrent performance and a high heat-dissipation or heating efficiency.

Description

A large-capacity battery pack

Technical field

This application belongs to the field of batteries, and specifically relates to a large-capacity battery pack.

Background technique

Lithium-ion batteries have a wide range of applications. In recent years, with the further development of lithium-ion batteries, multiple lithium-ion batteries are connected in series and parallel, making them used in energy storage, power batteries and other fields. When multiple lithium-ion batteries are connected in series and parallel, how to achieve reliable electrical connection is a critical part.

Chinese patent application CN113629359A provides a large battery connection structure. The structure includes at least one metal grid connector. Both ends of the metal grid connector are connected to poles respectively, so that adjacent batteries can be connected in series through the metal grid connector. , at the same time, the metal grille connector is provided with a groove, and a metal material is embedded in the groove. The melting point of the metal material is lower than that of the metal grille.

Chinese patent application CN113991258A provides a connection structure in which large-capacity single cells are connected in series. Positive current collecting posts and negative current collecting posts are set on both sides of the single cell. The positive current collecting post of one single cell is connected to the adjacent single cell. The negative electrode current collecting posts of the battery are connected in series through connecting components and tightened by setting clamps on two corresponding grooves on adjacent batteries. Several large-capacity batteries can be connected in series with each other through several clamps and grooves. This series connection method is not only It eliminates the need for connecting wires between large-capacity single cells, saving costs. On the other hand, it also increases the contact area of the positive and negative current collectors between the two batteries, reducing the heat generated by the connections between the batteries.

It can be seen from the above structure that lithium batteries are used in energy storage applications to connect multiple batteries in series and parallel. There are many connecting parts, the connection steps are complex and cumbersome, the battery management system, wires, and battery boxes are used in large amounts, and the production cost is high. At the same time, due to the large charging and discharging current and large volume of lithium-ion batteries, heat is more likely to be generated and accumulated. Excessive temperature will affect the service life of the battery.

Contents of the invention

In view of the shortcomings of the existing technology, this application provides a large-capacity battery pack. The large-capacity batteries in the large-capacity battery pack are electrically connected through the first cover plate and the second cover plate. This connection method has a simple structure and excellent over-current performance. Better, with higher heat dissipation or heating efficiency.

The technical solution of this application is as follows:

A large-capacity battery pack includes at least two large-capacity batteries. The large-capacity battery includes a casing, a battery pack placed in the casing, and cover plates located on opposite sides of the casing. The cover plate includes a first Cover plate and second cover plate, the first cover plate is the positive pole of the large-capacity battery, and the second cover plate is the positive pole of the large-capacity battery. The negative pole of the capacity battery, the positive pole of the battery pack is electrically connected to the first cover, the negative pole of the battery pack is electrically connected to the second cover, and the adjacent large-capacity battery passes through the first cover. The board and the second cover are electrically connected.

Further, it also includes a temperature control device. The temperature control device includes a temperature control unit, an input pipe, an output pipe and a heat transfer pipe. The input pipe and the output pipe are connected to the temperature control unit, and the heat transfer pipe is arranged in the corresponding position. Between the connecting surfaces of poles of two adjacent large-capacity batteries, there is a heat transfer medium in the heat transfer pipe to exchange heat with the poles.

Further, the heat transfer pipe is in contact with the connection surface of the pole, and a groove is provided on the connection surface of the pole to accommodate the heat transfer pipe. The cross section of the heat transfer pipe is circular, and the width of the groove is not less than The diameter of the heat transfer pipe, the height of the groove is smaller than the radius of the heat transfer pipe, the cross-sectional area of the groove is not less than half of the cross-sectional area of the heat transfer pipe, and the cross-section of the groove is semi-elliptical.

Further, the heat transfer pipe is a metal pipe, the input pipe and the output pipe are provided with an insulating part, and the heat transfer medium is an insulating medium.

Further, the heat transfer pipe is made of insulating material.

Further, it also includes a conductive component, which is disposed between poles connecting two large-capacity batteries, and is in electrical contact with the poles.

Furthermore, a fastening device is provided on the housing to bring the conductive component into close contact with the pole, and a groove is provided on the pole to fix the conductive component.

Further, the conductive component is a metal tube, the metal tube is a hollow tube, the cross-section of the metal tube is circular, the width of the groove is not less than the diameter of the metal tube, the height of the groove is less than the radius of the metal tube, and the groove is The cross-sectional area of the groove is greater than half of the cross-sectional area of the metal pipe, and the groove cross-section is semi-elliptical.

Further, it also includes a conductive device; the conductive device includes at least one conductive tube; the pole of the large-capacity battery is provided with at least one groove that matches the shape of the conductive tube, and adjacent large-capacity batteries are stacked so that The two grooves form an installation cavity, and the conductive tube is arranged in the installation cavity and is in surface contact with the installation cavity; at least one closed cavity is provided in the conductive pipe, and a phase change sensor is provided in the closed cavity. Materials used to achieve temperature regulation.

Further, the phase change material has a first state and a second state, the first state is a solid state, the second state is a liquid state, and the phase change material can support the side wall of the conductive tube.

Further, the phase change point temperature at which the phase change material changes from the first state to the second state is 30°C to 52°C.

Further, the conductive tube is an elliptical tube or a flat tube, and the phase change material is polyol or grease. One or more of fatty acids, crystalline hydrated salts, polyvalent alloys, and alkanes. The polyhydric alcohols include one or more of tetradecanol, neopentyl glycol, and pentaerythritol; the fatty acids include lauric acid. , myristic acid, palmitic acid, one or more, the crystalline hydrated salts include alkali metal hydrated salts, alkaline earth metal hydrated salts, nitrates, sulfates, phosphates, carbonates, acetates, thiolates, etc. One or more sulfates.

Further, the conductive tube is one or more of copper tubes, aluminum tubes and stainless steel tubes, and conductive glue is also provided between the conductive tube and the installation cavity.

Further, it also includes a conductive connection device; one end of the positive pole and the negative pole of the adjacent large-capacity battery extends to the outside of the casing, the conductive connection device includes at least one conductive connecting piece, and the two ends of the conductive connecting piece are respectively It is electrically connected to the positive pole and negative pole of the adjacent battery extending to the outside of the casing to realize the series connection of adjacent large-capacity batteries.

Furthermore, a plurality of grooves arranged at intervals are provided on the end surface of the conductive connecting piece close to the positive pole or the negative pole. The adjacent plane of the grooves is the first conductive surface, and the positive pole and the negative pole are close to each other. A plurality of spaced-apart grooves are provided on the end face of the conductive connecting piece, and the adjacent planes of the grooves are second conductive surfaces; the first conductive surfaces and the second conductive surfaces correspond to each other and are arranged oppositely. , forming multiple groups of conductive surfaces, and at least one conductive tooth is provided on the first conductive surface or the second conductive surface of each group of conductive surfaces, and the conductive teeth press the second conductive surface or the first conductive surface to produce plastic deformation, to achieve stable series connection.

Further, the conductive teeth are arranged continuously or at intervals along the width direction of the conductive connecting piece. The size of the end of the conductive teeth close to the conductive surface is larger than the size of the end far away from the conductive surface. The end of the conductive teeth close to the conductive surface is an arc. Surface structure, or the conductive teeth have a trapezoidal platform structure, which facilitates plastic deformation caused by extrusion.

Further, the conductive connection device includes a conductive connecting piece and two sets of conductive cables. One end of the two sets of conductive cables is electrically connected to the positive pole or the negative pole of the adjacent battery, and the other end of the two sets of conductive cables They are all electrically connected to the conductive connecting piece. The conductive connecting piece is provided with a mounting hole. The conductive cable is electrically connected to the conductive connecting piece in the mounting hole through at least one of a wiring lug, a welding, and a bolt.

Further, one end of the positive pole and the negative pole extends to the outside of the housing, the conductive connection device is a conductive cable, and the two ends of the conductive cable are respectively connected to the positive pole and the negative pole through a connecting nose, At least one of welding, bolts, and fixing clips realizes electrical connection.

Further, it also includes a conductive connection device, the conductive connection device is arranged on the side-by-side between large-capacity batteries to achieve electrical connection between large-capacity batteries; the conductive connection device includes N conductive connecting pieces, N is an integer greater than or equal to 2; the N conductive connecting pieces are along the battery core group in the large-capacity battery The stacking directions are spaced apart; the two ends of the N conductive connecting pieces are electrically connected to the poles of the large-capacity batteries placed side by side.

Further, the N conductive connecting pieces are insulated from each other, and the conductive connecting pieces are provided with an insulating sleeve or an insulating layer.

Furthermore, the N conductive connecting pieces have the same area for electrical connection with the large-capacity battery poles, and the N conductive connecting pieces have the same thickness and width, thereby achieving conductive balance among the N conductive connecting pieces.

Further, each conductive connection piece includes two conductive connection portions arranged in mirror images; the conductive connection portion includes a first conductive connection area, a second conductive connection area, a third conductive connection area and a fourth conductive connection area that are connected in sequence after being bent. Conductive connection area; the first conductive connection area is used to be fixedly attached to the pole of the large-capacity battery, and the fourth conductive connection area of the two conductive connection parts cooperates with each other to achieve electrical connection between the large-capacity batteries.

Furthermore, the first conductive connection area and the pole side of the large-capacity battery are electrically connected through welding, and the fourth conductive connection areas of the two conductive connection parts are embedded in each other and then electrically connected through bolt connection.

Further, adjacent large-capacity batteries are connected in series through two sets of conductive connection devices, one set of conductive connection devices is provided at one end of the large-capacity battery, and the other set of conductive connection devices is provided at the other end of the large-capacity battery.

Further, a functional component is also included between adjacent large-capacity batteries. The functional component includes a functional part and a fixing part. The functional part includes at least one pipe, and the pipe can conduct electricity and/or heat; the fixing part It is not conductive; the fixing part is set in a frame shape, and at least two ends of the pipe are clamped and fixed by the fixing part along its axial direction; the first cover plate and the second cover plate are both provided with grooves to accommodate For the functional part of the functional component, supporting parts are provided at both ends of the housing along the circumferential direction to seal and install the fixed part of the functional component.

Further, a cavity is provided inside the pipeline, and a heat-conducting medium is provided in the cavity.

Furthermore, a temperature control device is provided on the fixed part to control the temperature of the pipeline, and the temperature control device is a liquid cooler or a semiconductor refrigerator.

Further, the functional part includes electrically conductive pipes and thermally conductive pipes, and the electrically conductive pipes and thermally conductive pipes are laid alternately.

Further, the fixing part has elasticity, so that the first cover plate and the second cover plate can be sealed and installed Install the fixing part.

Further, it also includes an integrated mounting bracket, which includes a bracket body and a heat exchange device; the integrated mounting bracket is arranged between the first cover plate and the second cover plate of the adjacent large-capacity battery, And the installation groove of the integrated mounting bracket is provided with at least one heat pipe, or at least one heat pipe and a conductive pipe; the bracket body is an insulating piece, and a mounting groove is provided on the inside thereof, and the installation groove is used for installation Heat pipes and/or conductive pipes; the heat exchange device is arranged at one or both ends of the bracket body to realize heat exchange between the heat pipe and the temperature control device.

Further, the bracket body includes a first bracket, a second bracket and a bracket side plate. The first bracket and the second bracket are connected through at least one bracket side plate. The mounting groove is located between the first bracket and the second bracket. superior.

Furthermore, an insulating layer or an insulating pad is provided on the first bracket and the second bracket to achieve insulation between the heat pipe and the casing.

Further, a temperature measuring hole and a pressure measuring hole are provided at both ends or one end of the bracket body. The temperature measuring hole is used to install a temperature probe, and the pressure measuring hole is used to install a voltage probe.

Further, the heat exchange device includes a support pressure plate and an insulating heat exchange plate. The support pressure plate is integrally provided with the first bracket and the second bracket. A heat transfer plate is also provided between the support pressure plate and the insulating heat exchange plate.

Further, it also includes an upper pressure plate and a lower pressure plate; N large-capacity batteries are stacked sequentially from top to bottom. The upper pressure plate is arranged above the first cover of the top large-capacity battery and is connected with the shell of the top large-capacity battery. Fixed connection, used to reliably lock the top large-capacity battery; the lower pressure plate is arranged below the second cover plate of the bottom large-capacity battery, and is fixedly connected to the shell of the bottom large-capacity battery, used to lock the bottom Large-capacity battery at the end for reliable locking.

Further, the upper pressure plate and the lower pressure plate are both provided with fixed components, the fixed components include a locking frame and a locking bracket, the locking frame is fixedly connected to the upper pressure plate and the lower pressure plate, and the locking bracket is provided with At both ends of the locking frame, it is used to connect with the container. The lower pressure plate is also provided with a mounting plate, and the bottom of the mounting plate is provided with a universal wheel.

Furthermore, a connection hole is provided on the housing of the large-capacity battery, and a fastener is provided in the connection hole, so that the housings of adjacent large-capacity batteries are connected through the fastener.

Furthermore, an insulating plate is provided between the upper pressure plate and the first cover plate of the high-capacity battery at the top, and an insulating plate is provided between the lower pressure plate and the second cover plate of the large-capacity battery at the bottom end.

Further, the first cover plate and the second cover plate of the large-capacity battery are provided with conductive protrusions, The first cover plate and the second cover plate of adjacent large-capacity batteries are electrically connected by extrusion of conductive protrusions. At the same time, the upper and lower pressure plates are provided with conductive protrusions that match The upper pressure plate and the first cover plate, and the lower pressure plate and the second cover plate are firmly installed through the cooperation of the conductive protrusions and the installation groove.

The beneficial effects of this application are:

1. In this application, a heat transfer pipe is provided on the pole connection surface of the large-capacity battery pack. A circulating heat transfer medium is provided in the heat transfer pipe. The heat generated by the large-capacity battery during the charging and discharging process is transferred from the pole connection surface. To the heat transfer pipe, the heat is dissipated through the heat transfer medium in the heat transfer pipe, or the heat in the heat transfer medium is transferred to the large-capacity battery through the pole connection surface. This design improves the heat conduction efficiency and plays a role in rapid heat conduction. The effect is to improve the service life of large-capacity batteries, and it has a simple structure and strong applicability.

2. In this application, a conductive component is installed between the positive and negative poles of the large-capacity battery pack. The conductive component can increase the stability of the connection between the large-capacity battery poles, and can make the positive and negative poles between the large-capacity batteries fully contact. The conductive overcurrent performance of the pole is improved, and the conductive device has a simple structure and strong applicability.

3. In this application, a conductive tube is set between the positive and negative poles of the large-capacity battery pack. The conductive tube can increase the conductive contact area between the positive and negative poles of the large-capacity battery, so that the positive and negative poles of the large-capacity battery are in full electrical contact. , which improves the conductive overcurrent performance of the positive and negative poles. The conductive tube has a simple structure and strong applicability. At the same time, this application sets a phase change material in the conductive tube. The phase change material can not only effectively support the side walls of the conductive tube, but also make the conductive tube fully contact with the positive and negative electrode columns, prevent the conductive area from being reduced due to excessive deformation of the conductive tube, and improve The over-current performance between the two can also regulate the temperature so that large-capacity batteries can operate at the optimal operating temperature.

4. In the large-capacity battery pack of this application, the first cover plate and the second cover plate of the large-capacity battery are positive poles and negative poles, which are realized by electrically connecting the positive poles and negative poles of adjacent large-capacity batteries through a conductive connecting device. In series connection, large-capacity batteries can be placed in series horizontally to improve space utilization, with simple structure, easy assembly, and more stable electrical connection.

5. In the large-capacity battery pack of this application, a first conductive surface is provided on the conductive connecting piece, and a second conductive surface is provided on the positive pole and the negative pole. The first conductive surface and the second conductive surface correspond to each other and are arranged oppositely, forming a There are multiple groups of conductive surfaces. The first conductive surface or the second conductive surface of each group of conductive surfaces is provided with at least one conductive tooth. The conductive teeth press the second conductive surface or the first conductive surface to produce plastic deformation, which can make the electrical connection more stable. ; The resistance at the conductive surface contact is small, which can reduce the energy loss of the battery and reduce the heat generated.

6. In the large-capacity battery pack of this application, the size of the end of the conductive teeth close to the conductive surface is larger than that of the end far away from the conductive surface. According to the size of one end of the surface, the end of the conductive teeth close to the conductive surface has an arc surface structure, or the conductive teeth have a trapezoidal platform structure. Such structures are more prone to plastic deformation.

7. In the large-capacity battery pack of this application, there are two sets of conductive connecting sheets. One set of conductive connecting sheets are electrically connected to the first end faces of the positive and negative poles respectively, and the other set of conductive connecting strips are respectively connected to the first ends of the positive and negative poles. The second end face is electrically connected to increase the conductive area, improve the conductive efficiency and the stability of the electrical connection.

8. In the large-capacity battery pack of this application, the conductive connection device includes N conductive connecting pieces. The large-capacity batteries placed side by side are electrically connected through the N conductive connecting pieces, so that the current between the large-capacity batteries placed side by side passes through multiple groups. The channel realizes circulation, thereby achieving an electrical connection without aggregation and balanced current density. This electrical connection method can reduce the internal resistance during the power transmission process, thereby improving the efficiency of electrical transmission and energy storage. At the same time, this electrical connection method has a simple structure and only needs to be provided with conductive connecting pieces to achieve series or parallel connection between large-capacity batteries. In addition, the conductive connection device has a part extending to the outside of the large-capacity battery, and this part is the connection area of the two conductive connection parts in the conductive connection piece. This method is convenient for operators to install and disassemble.

9. This application adds functional components between adjacent large-capacity batteries. The functional components include pipes and frame-like structures. The functional pipes are fixed through the frame-like structure, and the functional pipes are integrated to improve the performance of the large-capacity battery pack. Assembly efficiency improves the electrical and/or thermal conductivity between large-capacity battery packs, extending battery life and reducing system costs. At the same time, the fixed part can also integrate battery management systems, liquid coolers, semiconductor refrigeration fins, radiators, etc. It is small in size and simple to install. It can seal and insulate the poles. At the same time, the TEC controller can convert the semiconductor refrigeration fins according to BMS instructions. The positive and negative poles are opposite, which plays a role in cooling and heating the battery.

10. This application adds an integrated mounting bracket to the adjacent large-capacity battery. The integrated mounting bracket can integrate conductive components, thermal conductive components, and liquid cooling pipes. Install each component according to the set position, and then The whole unit is installed between the poles of the large-capacity battery. During on-site installation, the whole unit can be installed in one go, saving time and effort. At the same time, after the conductive components, thermal components, and liquid cooling pipes are installed through the integrated mounting bracket, the installation of each component can be accurately positioned to avoid problems such as performance degradation of large-capacity batteries.

11. In the large-capacity battery pack of this application, by setting upper pressure plates and lower pressure plates at the top and low ends of the large-capacity battery pack respectively, the top large-capacity battery and the low-end large-capacity battery improve the ability to suppress the internal pressure of the battery, so that It has a higher pressure-bearing capacity, thereby improving the safety and service life of the large-capacity battery pack. At the same time, this method has a simple structure and is easy to install.

Description of the drawings

Figure 1 is a schematic structural diagram of a large-capacity battery pack in Embodiment 1 of the present application;

Figure 2 is a schematic diagram of the temperature control device in Embodiment 1 of the present application;

Figure 3 is a schematic structural diagram of a large-capacity battery and conductive components in Embodiment 1 of the present application;

Figure 4 is a schematic cross-sectional view of the groove and heat transfer pipe on the pole connection surface in Embodiment 1 of the present application;

Figure 5 is a schematic structural diagram of the large-capacity battery pack in Embodiment 2 of the present application;

Figure 6 is a schematic diagram 2 of the structure of the large-capacity battery pack in Embodiment 2 of the present application;

Figure 7 is a schematic cross-sectional view of the oval groove and heat conduction pipe on the pole in Embodiment 2 of the present application;

Figure 8 is a partial enlarged view of Figure 7;

Figure 9 is a schematic structural diagram of the conductive device in Embodiment 3 of the present application;

Figure 10 is a schematic cross-sectional view of the conductive device in Embodiment 3 of the present application;

Figure 11 is a schematic diagram of the conductive device before being squeezed in Embodiment 3 of the present application;

Figure 12 is a schematic structural diagram of the large-capacity battery pack in Embodiment 3 of the present application;

Figure 13 is a schematic structural diagram of the conductive connection device in Embodiment 4 of the present application;

Figure 14 is a schematic diagram 2 of the structure of the conductive connection device in Embodiment 4 of the present application;

Figure 15 is a partial structural diagram of Figure 14;

Figure 16 is a partial structural diagram of the large-capacity battery pack in Embodiment 4 of the present application;

Figure 17 is a schematic diagram 2 of the partial structure of the large-capacity battery pack in Embodiment 4 of the present application;

Figure 18 is a schematic structural diagram of the large-capacity battery pack in Embodiment 5 of the present application;

Figure 19 is a schematic structural diagram of a large-capacity battery in Embodiment 6 of the present application;

Figure 20 is a schematic diagram of the integral arrangement of the conductive connecting piece in Embodiment 6 of the present application;

Figure 21 is a schematic diagram of the cooperation between the large-capacity battery and the conductive connection device in Embodiment 7 of the present application;

Figure 22 is a schematic diagram of the cooperation between the pole and the conductive connection device in Embodiment 7 of the present application;

Figure 23 is a schematic structural diagram of the conductive connection device in Embodiment 7 of the present application;

Figure 24 is a schematic diagram of two sets of conductive connection devices in Embodiment 7 of the present application;

Figure 25 is a schematic diagram of multiple large-capacity battery packs connected in series in Embodiment 7 of the present application;

Figure 26 is a schematic structural diagram of functional components in Embodiment 8 of the present application;

Figure 27 is a schematic structural diagram 2 of the functional components in Embodiment 8 of the present application;

Figure 28 is a schematic structural diagram three of the functional components in Embodiment 8 of the present application;

Figure 29 is a schematic structural diagram 4 of the functional components in Embodiment 8 of the present application;

Figure 30 is a schematic structural diagram of the large-capacity battery pack in Embodiment 8 of the present application;

Figure 31 is a schematic structural diagram of the integrated mounting bracket in Embodiment 9 of the present application;

Figure 32 is a schematic second structural diagram of the integrated mounting bracket in Embodiment 9 of the present application;

Figure 33 is a schematic structural diagram of the heat exchange device in Embodiment 9 of the present application;

Figure 34 is a structural schematic diagram three of the integrated mounting bracket in Embodiment 9 of the present application;

Figure 35 is a partial enlarged view of the integrated mounting bracket in Embodiment 9 of the present application;

Figure 36 is a schematic structural diagram 2 of the heat exchange device in Embodiment 9 of the present application;

Figure 37 is a schematic diagram of the installation of the integrated mounting bracket in Embodiment 9 of the present application;

Figure 38 is a schematic diagram of the installation and use of the integrated mounting bracket in Embodiment 9 of the present application.

Figure 39 is a schematic structural diagram of the large-capacity battery pack in Embodiment 10 of the present application;

Figure 40 is a schematic structural diagram of the upper pressure plate and the fixing assembly in Embodiment 10 of the present application;

Figure 41 is a schematic structural diagram of the lower pressure plate and the fixing assembly in Embodiment 10 of the present application;

Figure 42 is a schematic structural diagram of the superposition of large-capacity batteries in Embodiment 10 of the present application;

Figure 43 is a cross-sectional view of the large-capacity battery in Embodiment 10 of the present application;

Figure 44 is a schematic diagram of the energy storage device in Embodiment 10 of the present application;

Figure 45 is a schematic diagram of large-capacity batteries connected through conductive connection rows in Embodiment 10 of the present application;

Figure 46 is a schematic diagram of the cooperation between the conductive connection row and the second cover plate in Embodiment 10 of the present application;

Figure 47 is a schematic diagram of the large-capacity battery pack connected through conductive cables in Embodiment 10 of the present application.

Description of the drawings: 11-heat transfer pipe, 12-input pipe, 13-output pipe, 14-temperature control unit, 15-insulation part, 16-large capacity battery, 17-pole connection surface, 18-groove, 19 - Groove section, 110 - heat transfer pipe section, 21 - conductive component, 22 - positive pole, 23 - negative pole, 24 - groove, 25 - conductive tube section, 26 - large capacity battery, 27 - groove section, 31-conductive tube, 32-phase change material, 33-large-capacity battery, 34-negative pole, 35-positive pole, 36-groove, 37-installation cavity, 41-conductive connection device, 42-large-capacity battery, 43-conductive teeth, 44-conductive cable, 411-first conductive surface, 421-positive pole, 422-negative pole, 425-second conductive surface, 51-large-capacity battery, 52-conductive connection device, 511-shell Body, 512-first cover plate, 513-second cover plate, 514-single battery core, 521-conductive connection piece, 522-bolt, 5211-first conductive connection area, 5212-second conductive connection area, 5213 - The third conductive connection area, 5214 - the fourth conductive connection area, 63 - semiconductor liquid cooling unit, 611 - pipe, 612 - box, 6111 - overflow part, 6112 - conductive pipe, 6113 - thermal conductive pipe, 6114 - thermal and electrical conductivity Pipe, 621-first cover plate, 622-second cover plate, 623-casing, 624-groove, 625-supporting part, 71-bracket body, 72-heat exchange device, 73-heat pipe, 74-conducting Tube, 75-annular sealing groove, 76-large capacity battery, 77-first cover plate, 78-second cover plate, 79-temperature control tube, 711-first bracket, 712-second bracket, 713-bracket side Plate, 714-mounting groove, 715-connection pin, 716-positioning hole, 717-insulating layer or insulating pad, 718-Temperature measurement hole, 719-Pressure measurement hole, 721-Support pressure plate, 722-Insulation heat exchange plate, 723-Heat transfer plate, 81-Large capacity battery, 82-Upper pressure plate, 83-Lower pressure plate, 84-Fixed components , 85-universal wheel, 86-conductive connection row, 87-conductive cable, 841-locking frame, 842-locking bracket, 843-mounting plate, 811-single battery core, 812-casing, 813- First cover plate, 814 - second cover plate, 815 - connection hole, 816 - fastener, 817 - conductive protrusion, 821 - second conductive tooth, 861 - first conductive tooth.

Detailed ways

The above solution will be further described below with reference to specific examples. It should be understood that these examples are used to illustrate the present application and are not limited to limiting the scope of the present application. For example, certain words are used in the description and claims to refer to specific components.

This application provides a large-capacity battery pack. The large-capacity battery pack includes at least two large-capacity batteries. A single large-capacity battery includes a casing, a battery pack placed in the casing, and covers located on opposite sides of the casing. The core set includes at least one single cell, and the cover plate includes a first cover plate and a second cover plate. The first cover plate is the positive pole of the large-capacity battery, and the second cover plate is the negative pole of the large-capacity battery. The battery core set The positive electrode is electrically connected to the first cover, the negative pole of the battery pack is electrically connected to the second cover, the adjacent large-capacity batteries are electrically connected through the first cover and the second cover, and the adjacent large-capacity batteries are stacked Or set side by side.

Example 1

As shown in FIGS. 1 to 4 , the large-capacity battery pack in this embodiment includes a temperature control unit 14 , a heat transfer pipe 11 , an input pipe 12 , an output pipe 13 and at least two large-capacity batteries 16 . There is a circulation pump and a heating and cooling system in the temperature control unit 14. The first port of the input pipe 12 is connected to the output end of the circulation pump. The first port of the output pipe 13 is connected to the input end of the circulation pump. The two ends of the heat transfer pipe 11 are connected to the first port of the input pipe 12 respectively. The second port is connected to the second port of the output pipe 13. The heat transfer pipe 11 is placed between the pole connecting surfaces 17 of the positive pole and the negative pole of two adjacent large-capacity battery packs. There is a circulating fluid in the heat transfer pipe 11. Heat transfer medium, this structural design is more conducive to heat conduction, and the heat transfer pipes can be insulated plastic pipes or aluminum pipes.

During the charging and discharging process of the large-capacity battery 16, the poles accumulate a large amount of heat. The heat transfer medium flowing in the heat transfer pipe 11 absorbs and transports the excess heat in the large-capacity battery. When it is necessary to provide heat to the large-capacity battery, the heat transfer medium flows in the heat transfer pipe 11. The heated heat transfer medium in the heat pipe transfers heat to the large-capacity battery through the poles, so that the large-capacity battery pack can operate normally. This large-capacity battery pack can dissipate or heat heat more quickly and effectively through the temperature control device, and has high heat transfer efficiency, which improves the service life and working effect of the large-capacity battery. During operation, the large-capacity battery 16 has a temperature sensing element connected to the battery management system BMS. When the BMS detects that the operating temperature of the large-capacity battery is outside the optimal range, it starts the temperature control unit 14 for heating or cooling, and the pump body heats the battery. /cold water circulation to heat or cool large-capacity batteries.

As shown in Figure 2, the heat transfer pipe 11 is an aluminum pipe, and there is a heat transfer medium ethylene glycol that can circulate in the heat transfer pipe 11. In actual use, when the heat transfer pipe 11 is a metal pipe, in order to prevent short circuit, Insulation parts 15 are provided at the connections between the heat transfer pipe 11 and the input pipe 12 and the output pipe 13 . The poles of the large-capacity battery 16 accumulate a large amount of heat during the charging and discharging process. The heat transfer medium flowing in the heat transfer pipe 11 absorbs and transports the excess heat. When it is necessary to provide heat to the large-capacity battery, the heat transfer pipe 11 The medium-heated heat transfer medium transfers heat to the large-capacity battery through the pole, so that the large-capacity battery can operate normally. The large-capacity battery pack can dissipate or heat heat more quickly and effectively through the temperature control device 4, and has high heat transfer efficiency, thereby improving the service life and working effect of the large-capacity battery.

As shown in Figure 3, the pole connection surface 17 of the large-capacity battery pack is provided with a strip groove 18, and the heat transfer pipe 11 is placed in the groove 18, so that the heat transfer pipe 11 matches the groove 18 and is embedded in it. The outer surface of the heat transfer pipe 11 is in contact with the inner surface of the groove 18. This structure increases the contact surface between the heat transfer pipe 11 and the pole, which is more conducive to heat transfer and improves heat transfer efficiency and battery life. . When the heat transfer pipe 11 is a metal pipe, the metal pipe placed in the groove 18 also plays a conductive role, increasing the conductive area of the pole, reducing the battery's calorific value, and extending the battery's service life.

As shown in Figure 4, in this embodiment, the groove section 19 on the pole connection surface is semi-elliptical, the heat transfer pipe section 110 is circular, the width of the groove is greater than the diameter of the heat transfer pipe, and the heat transfer pipe 11 It can be accommodated in the groove, and the height of the groove is less than the radius of the heat transfer pipe. When the cross-sectional area of the groove is greater than half of the cross-sectional area of the heat transfer pipe, the positive and negative poles can squeeze and deform the circular tube placed in the groove so that The outer surface of the heat transfer pipe 11 is in full contact with the inner surface of the groove, thereby increasing the contact area between the heat transfer pipe and the pole, and improving the heat transfer efficiency of the heat transfer pipe. It should be noted that the shape of the groove on the pole can be straight, spiral, wavy, S-shaped, circular, etc., which can accommodate or fix the heat transfer pipe, and is not limited to the shapes listed above. .

Example 2

As shown in Figure 5, the large-capacity battery pack provided by this embodiment includes a conductive component 21 and at least two large-capacity batteries 26. The first cover plate and the second cover plate of the large-capacity battery 26 are the positive pole 22 and the negative pole respectively. twenty three. The conductive component 21 is disposed between the positive pole 22 and the negative pole 23 of the large-capacity battery. The conductive component 21 is a conductive plate. In practical applications, since the first cover plate and the second cover plate are poles of the large-capacity battery, The area is relatively large. When multiple large-capacity batteries are connected, relying only on the external fixation method of the battery, the connecting surfaces of the positive and negative poles will have parts that cannot be fully contacted, which will lead to poor overcurrent performance of the poles. In this embodiment, the upper and lower sides of the conductive component 21 of the large-capacity battery are in electrical contact with the positive pole 22 and the negative pole 23, so that the positive pole 22 and the negative pole 23 are electrically connected, so that the positive pole 22 and the negative pole 23 are electrically connected. The negative pole 23 can be fully contacted, thereby improving the overcurrent performance of the pole.

As shown in Figure 6, the above-mentioned conductive component 21 can also be a metal tube. The positive pole 22 and the negative pole 23 are provided with a groove 24, and the metal tube is fixed in the groove 24. In practical applications, when the positive pole 22 and the negative pole When the posts 23 are in contact, the metal tube placed between the positive and negative electrodes is in electrical contact with the positive post 22 and the negative post 23. This structural design of the metal tube can increase the contact area between the positive post 22 and the negative post 23 with the help of the metal tube. , improve flow capacity.

As shown in Figures 7 and 8, in this embodiment, the metal tube is a conductive tube, and the conductive tube is arranged between the positive pole 22 and the negative pole 23. The conductive tube cross-section 25 is circular, and the groove cross-section 27 has a width D It is larger than the diameter D' of the conductive tube cross section 25, and the cross-sectional area S of the groove is smaller than the cross-sectional area S' of the conductive metal tube. The cross-section of the groove is semi-elliptical, and the conductive tube is fixed in the groove. In actual use, when the positive and negative poles are in contact, the hollow aluminum tube deforms under the extrusion of the positive and negative poles, filling the contact surface between the positive and negative poles, improving the overcurrent performance and increasing the Stability of pole connection.

When the conductive tube is a hollow tube, there can also be a heat transfer medium in the hollow tube, and the conductive component can also play a role in transferring heat between the electrode poles. It should be noted that the shape of the groove on the pole can be straight, spiral, wavy, S-shaped, circular, etc., which can accommodate or fix the heat transfer pipe, and is not limited to the shapes listed above. .

Example 3

As shown in FIGS. 9 to 12 , the large-capacity battery pack provided by this embodiment includes multiple large-capacity batteries 33 and conductive devices. The above-mentioned conductive device is arranged between the first cover plate and the second cover plate of two adjacent large-capacity batteries 33. The first cover plate and the second cover plate are the positive pole 35 and the negative pole 34 of the large-capacity battery 33. , connected to the tabs or positive and negative terminals of the battery pack in the housing to achieve current transmission.

In this embodiment, the conductive device includes at least one conductive tube 31 . During installation, the conductive tube 31 is arranged between the positive pole 35 and the negative pole 34 of adjacent large-capacity batteries, so that the positive pole 35 or the negative pole 34 between the large-capacity batteries 33 is fully contacted, and the positive pole 35 or the negative pole 34 is added. The stability of the electrical connection is improved while the conductive overcurrent performance of the positive pole 35 or the negative pole 34 is improved. This embodiment does not impose any requirements on the shape of the conductive tube 31 , as long as the conductive tube 31 can be in surface contact with the positive pole 35 and the negative pole 34 . At this time, the two opposing side surfaces of the conductive tube 31 are both outwardly convex arcuate surfaces, and the two arcuate surfaces are used to make surface contact with the positive pole 35 and the negative pole 34 of the large-capacity battery 33 . At this time, the two arc surfaces can be connected through a smooth and excessive curved surface, so that the conductive tube 31 is an elliptical tube or a flat tube, or the two arc surfaces can be connected through a flat surface, so that the shape of the conductive tube 31 is similar to a drum-shaped structure or inward. A sunken lantern-like structure.

In the preferred solution of this embodiment, the negative pole 34 and the positive pole 35 of the large-capacity battery 33 are provided with There is at least one groove 36 matching the shape of the conductive tube 31. Adjacent large-capacity batteries 33 are stacked so that the two grooves 36 form an installation cavity 37. The conductive tube 31 is arranged in the installation cavity 37 and is connected with the installation cavity. Body 37 is in surface contact. In order to make the conductivity between the negative pole 34 and the positive pole 35 more reliable, conductive glue may be further provided between the conductive tube 31 and the installation cavity 37 . In actual use, the conductive tube 31 is arranged in the groove 36 of the negative pole 34 and the positive pole 35 of the two large-capacity batteries 33. When the adjacent large-capacity batteries 33 are fixed in series, the conductive tube 31 is extruded and deformed, so that It is closely connected with the negative pole 34 and the positive pole 35, increasing the conductive area and reducing the resistance.

In this embodiment, the shape and structure of the conductive tube 31 can be realized by extrusion. The conductive tube 31 is arranged between the positive pole 35 and the negative pole 34. When not extruded, the conductive tube 31 has a circular cross-section and a grooved cross-section. The width is greater than the diameter of the cross-section of the conductive tube 31, and the cross-sectional area of the groove is smaller than the cross-sectional area of the conductive tube 31. The cross-section of the groove is semi-elliptical. When the negative pole 34 and the positive pole 35 are in contact, the conductive tube 31 (i.e., the hollow aluminum tube) is deformed under the extrusion of the negative pole 34 and the positive pole 35, and is extruded into an oval shape, filling the negative pole 34 and the positive pole. The contact surface of 35mm not only improves the over-current performance, but also increases the stability of the pole connection.

The above-mentioned conductive tube 31 is made of conductive material, specifically a copper tube, an aluminum tube, a stainless steel tube, etc., and has relatively excellent electrical conductivity. At the same time, the above-mentioned conductive tube 31 is provided with a phase change material 32 . The phase change material 32 is provided in the conductive tube 31 . The phase change material 32 has two states: solid state and liquid state. The phase change material 32 can not only affect the side of the conductive tube 31 The wall supports the conductive tube 31 to prevent the conductive area from being reduced due to excessive deformation, so that the conductive tube 31 is fully in contact with the positive pole 35 and the negative pole 34 . At the same time, the phase change material 32 can also adjust the temperature inside the conductive tube 31 . The poles of the large-capacity battery accumulate a large amount of heat during the charging and discharging process, and the phase change material 32 absorbs and transports the excess heat out of the large-capacity battery pack.

One or more sealed cavities may be provided inside the above-mentioned conductive tube 31, and the phase change material 32 is packaged in the sealed cavity. After the phase change material 32 is filled, both ends of the conductive tube 31 are sealed by welding or blocking plates. The phase change material 32 absorbs the heat released by the large-capacity battery during use, effectively preventing thermal runaway of the large-capacity battery. The above-mentioned phase change material 32 has a first state and a second state. The first state is a solid state and the second state is a liquid state. The phase change point from the first state to the second state is preferably at a temperature of 30 to 52°C, more preferably , the temperature is 35~42℃. Specifically, the phase change material 32 can be polyols (tetradecanol, neopentyl glycol, pentaerythritol, etc.), fatty acids (lauric acid, myristic acid, palmitic acid, etc. and their mixtures, etc.), alkane substances (paraffin, etc.) ), crystalline hydrated salts (alkali and alkaline earth metal halides containing crystal water, nitrates, sulfates, phosphates, carbonates and acetates, thiosulfates, etc.), multi-component alloys (such as tin alloys, aluminum alloy, etc.). The phase change material 32 absorbs or releases heat during the phase change process, and exchanges the heat generated by the large-capacity battery with the outside to compensate for the It eliminates the shortcomings of sensible heat storage that cannot store heat for a long time, and no chemical reaction occurs, which will not cause harm to the ecological environment.

When multiple sealed cavities are provided in the conductive tube 31 , the multiple sealed cavities may be filled with the same phase change material 32 or different phase change materials 32 . The phase change material 32 is a multi-component alloy and an alkane substance, and the two are mixed in a certain proportion. The advantage of this type of composite phase change material 32 is that the operation steps are simple, and its phase change temperature can be changed by changing the proportion. The multi-component alloy is tin alloy, One or more of the aluminum alloys, the alkane substance is paraffin. The phase change material 32 absorbs or releases heat during the phase change process, thereby performing heat exchange.

Example 4

As shown in FIGS. 13 to 17 , the large-capacity battery pack provided by this embodiment includes a plurality of large-capacity batteries 42 and a conductive connection device 41 . The large-capacity battery 42 includes a first cover plate, a second cover plate, a casing and a battery pack. The first cover plate, the second cover plate and the casing are enclosed to form a battery casing. The battery pack is disposed in the casing. The positive electrode lug of the core pack is welded to the first cover plate, and the negative electrode lug of the battery pack is welded to the second cover plate. The first cover plate and the second cover plate are the positive electrode posts 421 and the negative electrode posts 422 of the large-capacity battery 42; they are conductively connected. The device 41 is electrically connected to the positive pole 421 and the negative pole 422 of the adjacent large-capacity batteries 42 to realize the series connection of the adjacent large-capacity batteries 42.

As shown in Figure 16, one end of the positive pole 421 and the negative pole 422 of the adjacent large-capacity battery 42 both extend to the outside of the case. The conductive connection device 41 is a conductive connecting piece, and the two ends of the conductive connecting piece extend to the case respectively. The positive pole 421 and the negative pole 422 of the adjacent large-capacity battery 42 on the outside are electrically connected. It should be noted that the positive pole 421 and the negative pole 422 may themselves extend to the outside of the case, or may extend to the outside of the case through the electrode lead-out plate. At this time, the two large-capacity batteries 42 connected in series have the following two connection methods:

In the first type, the upper cover plate of one large-capacity battery 42 is the first cover plate, the lower cover plate of another large-capacity battery 42 is the second cover plate, and the first cover plate and the second cover plate of the adjacent large-capacity battery 42 are The boards are connected through soft conductive connecting pieces placed at an angle. This method requires a longer length of conductive connecting pieces and is more difficult to connect;

In the second type, the upper cover of one large-capacity battery 42 is the first cover, the upper cover of the other large-capacity battery 42 is the second cover, and the first cover and the second cover of the adjacent large-capacity battery 42 are The boards are connected through horizontally placed conductive connecting pieces; in this method, the length of the conductive connecting pieces is shorter and the connection is more convenient;

The positive poles and negative poles of adjacent large-capacity batteries 42 are electrically connected through the conductive connection device to achieve series connection. The large-capacity batteries 42 can be placed in horizontal series, improving space utilization and having a simple structure. It is easy to assemble and the electrical connection is more stable. As shown in Figures 13 to 15, in some embodiments, a plurality of spaced grooves are provided on the end surface of the conductive connecting piece close to the positive pole 421 or the negative pole 422, and the adjacent planes of the grooves are the first conductive Surface 411, the end surfaces of the positive pole 421 and the negative pole 422 close to the conductive connecting piece are provided with a plurality of grooves arranged at intervals, and the plane adjacent to the grooves is the second conductive surface 425; the first conductive surface 411 and the second conductive surface The surfaces 425 correspond one to one and are arranged relatively to form multiple groups of conductive surfaces, which not only improves the stability of electrical connection, but also improves space utilization, has a simple structure, is easy to assemble, and saves costs.

In some embodiments, at least one conductive tooth 43 is provided on the first conductive surface 411 or the second conductive surface 425 of each group of conductive surfaces. The conductive teeth 43 press the second conductive surface 425 or the first conductive surface 411 to produce plastic deformation. , which can enable large-capacity batteries to achieve stable series connection. At the same time, the resistance at the conductive surface contact is small, which can reduce the energy loss of large-capacity batteries and reduce the heat generated. In some embodiments, the conductive teeth 43 are arranged continuously or at intervals along the width direction of the conductive connecting piece. The size of the end of the conductive teeth 43 close to the conductive surface is larger than the size of the end far away from the conductive surface. The end of the conductive teeth 43 close to the conductive surface has an arc surface structure to facilitate plastic deformation due to extrusion. It should be noted that the conductive teeth 43 can also have a trapezoidal platform structure, which can also achieve the effect of easy plastic deformation.

In some embodiments, there are two sets of conductive connecting pieces, wherein one set of conductive connecting pieces is electrically connected to the first end surfaces of the positive pole 421 and the negative pole 422 (ie, the upper end surfaces of the positive pole 421 and the negative pole 422) respectively, and in addition A set of conductive connecting pieces are electrically connected to the second end surfaces of the positive pole 421 and the negative pole 422 (i.e., the lower end faces of the positive pole 421 and the negative pole 422) respectively, which increases the contact area of the conductive surface and improves the conductive efficiency and electrical connection. stability.

In other embodiments, the conductive connection device further includes a conductive connecting piece and two sets of conductive cables. One end of the two sets of conductive cables is electrically connected to the positive pole or the negative pole of the adjacent battery respectively, and the other end of the two sets of conductive cables All are electrically connected to the conductive connecting piece. The conductive connecting piece is provided with a mounting hole. The conductive cable is welded in the mounting hole to achieve electrical connection with the conductive connecting piece. In addition, the electrical connection to the conductive connecting piece can also be achieved through wiring lugs or bolts. connect. As shown in Figure 17, in other embodiments, one end of the positive pole 421 and the negative pole 422 both extend to the outside of the casing, the conductive connection device 41 is a conductive cable 44, and the two ends of the conductive cable 44 are connected to the positive pole 421 respectively. The negative electrode post 422 is fixedly electrically connected through the wiring lug. In addition, the electrical connection can also be achieved through welding, bolts, and fixing clips.

Example 5

As shown in FIG. 18 , the large-capacity battery pack provided in this embodiment can also be used in an energy storage device. The energy storage device includes 8 sets of large-capacity battery packs and conductive connection devices 41 . The large-capacity battery 42 includes a first cover plate, a second cover plate, a casing and a battery pack. The first cover plate, the second cover plate and the casing are enclosed to form a battery casing. The battery pack is arranged in the casing. The positive electrode lug of the battery pack is welded to the first cover plate, and the negative electrode lug of the battery pack is welded to the second cover plate. The first cover plate and the second cover plate are the positive electrode posts of the large-capacity battery. 421. Negative pole 422; the conductive connection device 41 is electrically connected to the positive pole 421 and negative pole 422 of adjacent large-capacity batteries to realize series connection of adjacent batteries.

The large-capacity battery pack provided by this embodiment includes 8 large-capacity battery packs. Each large-capacity battery pack is composed of 8 large-capacity batteries connected in series longitudinally. The eighth large-capacity battery 42 of the first large-capacity battery pack is connected to the The eighth large-capacity battery 42 of the second group of large-capacity battery groups is electrically connected laterally through the conductive connection device 41, and the first large-capacity battery 42 of the second group of large-capacity battery groups is connected to the first large-capacity battery 42 of the third group of large-capacity battery groups. The large-capacity batteries 42 are electrically connected laterally through the conductive connection device 41, and by analogy, the large-capacity battery packs are connected in series until the eighth large-capacity battery pack, forming an 8x8 large-capacity battery pack that is combined vertically and horizontally, which improves space. Utilization rate, simple structure, easy assembly, and more stable electrical connection.

Example 6

As shown in Figures 19 and 20, the large-capacity battery pack of this embodiment includes multiple large-capacity batteries 51. A single large-capacity battery 51 includes a housing 511, a first cover 512, a second cover 513 and a battery pack. The battery core group includes at least one single battery core 514; the single battery core 514 is disposed in the battery case formed by the casing 511, the first cover plate 512 and the second cover plate 513, and the first cover plate 512 and the second cover plate 513. The two cover plates 513 are respectively the positive electrode column and the negative electrode column of the large-capacity battery 51. The positive electrode lug of the single cell 514 is electrically connected to the first cover plate 512 (i.e., the positive electrode column) through a conductive connector, and the negative electrode lug is electrically connected to the first cover plate 512 (i.e., the positive electrode column) through a conductive connector. It is electrically connected to the second cover plate 513 (negative pole), so that the current of the plurality of single cells 514 is drawn out through the first cover plate 512 and the second cover plate 513 . When designing the electrical connection of the large-capacity battery pack, multiple large-capacity batteries 51 are connected in series to achieve a "no aggregation, balanced current density" electrical connection structure at every level and link of the large-capacity battery pack. No aggregation means that a current source has its own shortest dedicated channel during transmission and does not share channels with other current sources; balanced current density means that the current density of the conductive structures at multiple electrical connection points is basically the same, with very little difference.

Based on this, this embodiment provides a conductive connection device 52 with no aggregation and balanced current density. The conductive connection device 52 is disposed between large-capacity batteries 51 placed side by side to achieve electrical connection between the large-capacity batteries 51 . The conductive connection device 52 includes N conductive connection pieces 521, where N is an integer greater than or equal to 2; the N conductive connection pieces 521 are used to realize electrical connections between large-capacity batteries 51 placed side by side; the N conductive connection pieces 521 are arranged along the The two ends of the N conductive connecting pieces 521 are respectively used for electrical connection with the poles of the large-capacity batteries 51 placed side by side. When adjacent large-capacity batteries 51 need to be electrically connected, they can be electrically connected through multiple conductive connecting pieces 521. The conductive connecting pieces 521 provide undifferentiated electrical connection channels between adjacent large-capacity batteries 51. Due to the undifferentiated multiple balanced connections between adjacent poles, the current flow direction of each conductive connecting piece 521 will not be diverted closer to each other. Other conductive connecting pieces 521. Therefore, adjacent poles are electrically connected through a plurality of conductive connecting pieces 521, but there will be no aggregation and steering that increases the current density, thereby achieving higher balance, smaller internal resistance, and smaller heat generation. It can be seen from this that adjacent large-capacity batteries 51 are electrically connected through a plurality of conductive connecting pieces 521, so that the current between the large-capacity batteries 51 flows through multiple channels, thereby achieving an electrical connection without aggregation and balanced current density. Connection can reduce the internal resistance during the transmission of electrical energy, thereby improving the efficiency of electrical transmission and energy storage.

As shown in Figure 20, multiple single large-capacity batteries 51 are provided with five conductive connecting pieces 521 along the length direction of the poles and are spaced apart along the stacking direction of the single cells 514 in the large-capacity batteries 51. Since each conductive connection is The sheets 521 are distributed at intervals, so there is a spacing distance between each conductive connecting sheet 521, which is at least greater than the thickness of the conductive connecting sheet 521; wherein, the two ends of the five conductive connecting sheets 521 are respectively used to connect to large-capacity batteries placed side by side. The poles of the battery 51 are electrically connected; the above-mentioned conductive connecting piece 521 is an integrated structure, and the integrated structure can increase the reliability of the electrical connection. One end of the conductive connecting piece 521 is electrically connected to the pole of the large-capacity battery 51, and the other end is electrically connected to another large-capacity battery 51. The poles of the capacity batteries 51 are electrically connected, so that adjacent large-capacity batteries 51 are electrically connected through a plurality of conductive connecting pieces 521 . Normally, the conductive connecting piece 521 is linear or U-shaped. In order to increase the contact surface with the poles of the large-capacity battery 51, in this embodiment, the conductive connecting piece 521 is a U-shaped conductive connecting piece 521 formed by a bending process. . Of course, the conductive connecting piece 521 can also be configured as a non-bending structure, that is, an arc-shaped conductive connecting piece 521.

In order to make the multi-channel flow of current more reliable and avoid current aggregation, the N conductive connecting pieces 521 can be insulated from each other. Specifically, the conductive connecting pieces 521 can be covered with an insulating sleeve or provided with an insulating layer, so as to achieve mutual insulation between the conductive connecting pieces 521, thereby achieving a more reliable electrical connection without aggregation and balanced current density.

The above-mentioned conductive connecting piece 521 can be electrically connected to the pole through various methods, such as welding, bolt 522 connection, etc. At the same time, the conductive connecting piece 521 can adopt different structures, as long as multi-channel current transmission can be achieved. In order to further increase the conductive balance of the plurality of conductive connecting pieces 521 and achieve a more excellent electrical connection without aggregation and balanced current density, the thickness and width of the N conductive connecting pieces 521 can be set to the same, and the N conductive connecting pieces 521 can also be set to the same thickness. The area of the conductive connecting piece 521 that is electrically connected to the poles of the large-capacity battery 51 is the same. The conductive connecting piece 521 is preferably an aluminum piece. The aluminum piece is a conductor with good electrical conductivity and can better realize electrical connection. Furthermore, the conductive connecting piece 521 is preferably made of 1 series soft aluminum, and its thickness is preferably not greater than 4 mm, which takes into account good conductivity and easy bending, making the conductive The connecting pieces 521 are both good in conductivity and easy to bend, which facilitates the connection between the conductive connecting pieces 521 and reduces the internal locking stress between the conductive connecting pieces 521 .

Example 7

As shown in Figures 21 to 25, the large-capacity battery pack provided by this embodiment includes two large-capacity batteries 51 and two sets of conductive connection devices 52; one set of conductive connection devices 52 is provided at one end of the large-capacity battery 51, and the other A set of conductive connection devices 52 is provided at the other end of the large-capacity battery 51 . The two sets of conductive connection devices 52 make the electrical connection between adjacent large-capacity batteries 51 more reliable.

Each set of conductive connection devices 52 includes six conductive connection pieces 521 that are spaced apart along the stacking direction of the single cells 514 in the large-capacity battery 51 . The conductive connection pieces 521 are of a split structure and specifically include two The conductive connection parts are symmetrically arranged, one end of the conductive connection part is electrically connected to the pole of the large-capacity battery 51, the other end is electrically connected to one end of another conductive connection part, and the other end of the other conductive connection part is electrically connected to other large-capacity batteries 51 The poles are electrically connected, so that the large-capacity batteries 51 placed side by side are electrically connected through two sets of conductive connection devices 52. In order to make the multi-channel flow of current more reliable and avoid current aggregation, the conductive connecting pieces 521 are covered with an insulating sleeve or provided with an insulating layer, so as to achieve mutual insulation between the conductive connecting pieces 521 and achieve a more reliable non-aggregation. , electrical connections that balance current density.

The conductive connecting piece 521 in this embodiment has a split structure, and the split structure can be easily installed and disassembled. In the split structure, each conductive connection piece 521 includes two conductive connection portions arranged symmetrically (i.e., mirror image arrangement). Each conductive connection portion includes a first conductive connection area 5211 and a second conductive connection that are connected in sequence after being bent. area 5212, the third conductive connection area 5213 and the fourth conductive connection area 5214. The first conductive connection areas 5211 of the plurality of conductive connection parts are evenly arranged along the stacking direction of the single cells 514 in the large-capacity battery 51, and are evenly arranged. The second conductive connection area 5212 is perpendicular to the first conductive connection area 5211, the third conductive connection area 5213 is parallel to the first conductive connection area 5211, and the fourth conductive connection area 5214 is electrically connected to the pole side of the large-capacity battery 51. Perpendicular to the third conductive connection area 5213; one end of the second conductive connection area 5212 is connected to the first conductive connection area 5211, the other end is connected to one end of the third conductive connection area 5213, and the other end of the third conductive connection area 5213 is connected to the fourth conductive connection area 5213. The connection area 5214 is connected; the two conductive connection parts are electrically connected through the fourth conductive connection area 5214. For specific electrical connection, the first conductive connection area 5211 and the pole side of the large-capacity battery 51 are electrically connected through welding, and the fourth conductive connection areas 5214 of adjacent conductive connection pieces 521 are embedded in each other and connected through bolts 522 to achieve electrical connection. The bolt 522 can be an insulating bolt or a conductive bolt. When an insulating bolt is used, multi-channel one-to-one current flow can be achieved. When using conductive bolts, the transmitted currents of multiple conductive connections can be temporarily converged to the fourth conductive connection. Connection area 5214, and then the accumulated current is again transmitted to other large-capacity batteries 51 through a plurality of conductive connections. The fourth conductive connection area 5214 is arranged on the outside of the pole, that is, extends to the outside of the pole. In this way, the connection point of the electrically connected conductive connection piece 521 is located on the outside of the large-capacity battery 51, making it convenient for the operator to install and disassemble. The electrically connected conductive connecting piece 521 does not interfere with the large-capacity battery 51 when connected and detached.

In this embodiment, the thickness and width of the plurality of conductive connecting pieces 521 can be set to be the same, and the area where the first conductive connecting areas 5211 of the N conductive connecting pieces 521 are electrically connected to the poles of the large-capacity battery 51 can also be set. are the same, thereby achieving a more excellent electrical connection without aggregation and balanced current density. In this embodiment, the conductive connecting piece 521 is an aluminum piece, and the thickness of the conductive connecting piece 521 is preferably less than 4 mm.

As shown in Figure 25, the large-capacity battery pack provided in this embodiment can also be used in an energy storage device. The energy storage device includes multiple groups of large-capacity battery packs. Each large-capacity battery pack includes eight large-capacity batteries 51 stacked in sequence in the vertical direction. In each large-capacity battery pack, the upper large-capacity battery 51 has a second cover 513 and a lower large-capacity battery 51 The first cover plates 512 are in contact to realize the series connection of the upper and lower large-capacity batteries 51 . Multiple large-capacity battery packs arranged side by side are connected in series through conductive connection devices 52 . For example, the first cover 512 of the large-capacity battery 51 at the top of the i-1th large-capacity battery pack is the negative pole, the second cover 513 of the large-capacity battery 51 at the bottom is the positive pole, and the top of the i-th large-capacity battery pack is The first cover 512 of the large-capacity battery 51 is the positive pole, the second cover 513 of the bottom large-capacity battery 51 is the negative pole, and the first cover 512 of the top large-capacity battery 51 of the (i+1)th large-capacity battery pack is is the negative pole, the second cover 513 of the large-capacity battery 51 at the bottom is the positive pole, the large-capacity battery 51 at the top of the i-1 large-capacity battery pack and the large-capacity battery 51 at the top of the i-th large-capacity battery pack pass through The conductive connection device 52 realizes electrical connection, and the large-capacity battery 51 at the bottom of the i-th large-capacity battery pack and the large-capacity battery 51 at the bottom of the i+1-th large-capacity battery pack are electrically connected through the conductive connection device 52.

Example 8

As shown in FIGS. 26 to 30 , the large-capacity battery pack provided by this embodiment includes at least two large-capacity batteries and functional components arranged between the large-capacity batteries. The large-capacity battery includes a first cover 621 and a second cover 621 . 622. Case 623 and battery pack. The first cover 621, the second cover 622 and the case 623 are enclosed to form a battery case. The first cover 621 is the positive pole of the battery, and the second cover 622 is the battery. the negative pole.

The above functional component includes a functional part and a fixed part, where the functional part includes at least one pipe 611 for electrical and/or thermal conduction, the fixed part is a box 612, and the fixed part is insulated. In this embodiment, multiple pipes 611 may be included, and both ends of each independent pipe 611 are fixed by a frame 612 along its axial direction. Clamping and fixing; it can also be a pipe 611, which is clamped and fixed by the frame 612 after being laid in an S shape. The length, laying quantity, laying density, and laying shape of the pipes 611 can be adjusted according to the actual electrical and thermal conductivity requirements. After the pipe 611 is clamped and fixed by the square frame 612, it is very convenient to be fixedly installed with the casing. The integrated design can save installation time and installation difficulty. You only need to place the functional components at the corresponding positions of the large-capacity battery and use the upper and lower battery clamps. Just tighten it, which avoids the trouble of aligning the unfixed pipes 611 with the large-capacity battery cover and fixing them one by one.

The above-mentioned pipe 611 can pass through the box 612, and the box 612 can be integrally poured with designed rubber, or the box 612 can be divided into upper and lower parts to clamp the pipe 611, and the overflow part 6111 of the part overflowing the box 612 can play a certain role. For heat dissipation, especially when the pipe 611 is a metal pipe that has both electrical and thermal conductivity, the overflow portion 6111 can allow the battery case at high temperature to dissipate heat through the overflow portion 6111.

When the above-mentioned functional parts include conductive pipes 6112 and heat-conducting pipes 6113, the conductive pipes 6112 and heat-conducting pipes 6113 are laid alternately to achieve the effect of uniform conduction and heat conduction. The heat-conducting pipe can be a pipe laid in an S shape, or it can be laid separately. of straight pipe. The overflow part 6111 of the straight pipe is convenient for connecting control devices or liquid cooling systems. When the functional part is a thermally conductive and electrically conductive pipe 6114, it can be laid in an S shape. The frame 612 of the fixing part can also be in other shapes that adapt to the shape of the battery, such as circular, rectangular, etc.

In this embodiment, a cavity may also be provided inside the pipe 611, and a heat-conducting medium may be placed in the cavity to reduce the temperature of the large-capacity battery. For example, the pipe 611 can be a heat pipe, and a semiconductor refrigerator is installed on the fixed part to automatically balance the temperature of the battery case; circulating water can also be placed in the pipe 611, and a liquid cooler installed on the fixed part can be used to form a large-capacity battery. Cool down. A semiconductor liquid cooling unit 63 is provided on the fixed part to control the temperature of the functional part.

The above-mentioned fixed part may also be provided with a temperature control device to control the temperature of the pipeline 611. A battery management system is also fixedly mounted on the housing 62 . The battery management system is installed on the fixed part to control the temperature control device and monitor the battery status. The temperature control device is a liquid cooling machine or a semiconductor refrigeration unit. The functional pipes are fixed through a frame-like structure and the integrated design of the functional pipes improves the assembly efficiency of large-capacity battery packs, improves the electrical and/or thermal conductivity between large-capacity battery packs, extends battery life, and reduces system costs. . At the same time, the fixed part can also integrate battery management systems, liquid coolers, semiconductor refrigeration fins, radiators, etc. It is small in size and easy to install. It can seal and insulate the poles. At the same time, the semiconductor refrigeration unit (TEC controller) can be adjusted according to the battery The command of the management system (BMS) reverses the positive and negative poles of the semiconductor refrigeration chip to cool and heat the battery.

In other embodiments, after the battery pack is installed in the battery case, the positive pole and the negative pole are electrically connected. A large-capacity battery pack is formed in series; the first cover plate 621 and the second cover plate 622 are both provided with grooves 624, which can accommodate and install the functional parts of the functional components, that is, the pipes 611; both ends of the housing 623 are provided with grooves 624 along the circumferential direction. The supporting part 625 can seal and install the fixing part for electrically conductive and/or thermally conductive functional components. In this embodiment, the fixing part can be a square frame made of rubber or other high-temperature and high-pressure resistant material with a certain elasticity, which can serve as a seal when fixedly installed with the first cover plate and the second cover plate of two adjacent batteries. effect.

In order to increase the conductivity and/or area between the covers of the large-capacity battery, the pipe 611 is a circular pipe with a certain deformation space, and its cross-section is circular or elliptical. The cross-section of the groove 624 is semi-elliptical, the groove width _a1 is not less than the pipe diameter _a2 , the groove height _h1 is less than the pipe radius _h2 , and the groove cross-sectional area _R1 is greater than half of the pipe cross-sectional area _R2 , so that the first The first cover plate and the second cover plate are in full contact with the pipe.

Example 9

As shown in Figures 31 to 38, this embodiment provides a large-capacity battery pack, including a plurality of large-capacity batteries 76 with an integrated mounting bracket; the first cover 77 and the second cover 78 of the large-capacity batteries 76 are respectively The large-capacity battery 76 has a positive pole and a negative pole. Multiple large-capacity batteries 76 are stacked. The integrated mounting bracket is arranged between the first cover 77 and the second cover 78 of the adjacent large-capacity batteries 76 . When using the battery cover as a battery pole, conductive parts and heat conductive parts need to be installed between the battery poles, and liquid cooling pipes need to be installed outside the battery. Scattered installation is time-consuming and laborious, and if the installation position is not positioned properly, battery performance will decrease. etc., so this embodiment provides a mounting bracket that can install electrically conductive, thermally conductive components, and liquid cooling pipe installation components together. First, install each component according to the prescribed position, and then install the whole body between the battery poles. During on-site installation, the entire system can be installed in one go, saving time and effort.

The integrated mounting bracket provided in this embodiment includes a bracket body 71 and a heat exchange device 72; a mounting groove 714 is provided on the inside of the bracket body 71, and a heat pipe 73 and a conductive pipe 74 are installed in the mounting groove 714; the heat exchange device 72 is provided One or both ends of the bracket body 71 are used to realize heat exchange between the heat pipe 73 and the temperature control device. When multiple heat pipes 73 are provided in the same installation groove 714 of the integrated mounting bracket, the multiple heat pipes 73 are connected through connecting sleeves. This integrated mounting bracket can integrate electrically conductive components, thermally conductive components, and liquid cooling pipe installation components. Each component can be installed according to the set position, and then installed as a whole between the battery poles. During on-site installation, the entire assembly can be It can be installed instantly, saving time and effort, and solving the problem of split installation. At the same time, after the conductive components, thermal components, and liquid cooling pipes are installed through the integrated mounting bracket, the installation of each component can be accurately positioned, thereby avoiding problems such as battery performance degradation.

The bracket body 71 of this embodiment specifically includes a first bracket 711, a second bracket 712 and a bracket side plate. 713, the first bracket 711 and the second bracket 712 are connected through at least one bracket side plate 713, and the mounting groove 714 is located on the opposite inner side of the first bracket 711 and the second bracket 712. The above-mentioned first bracket 711, second bracket 712 and the bracket side plate 713 can be connected through the connecting pin 715. The connecting pin 715 is a pluggable connection method for convenient detachable installation. Of course, it can also be connected by other means, such as welding or bolting. The bracket body 71 is provided with at least one positioning hole 716 for cooperating with the positioning post of the battery cover, thereby realizing the positioning and installation of the bracket body 71 and the casing, so that the integrated mounting bracket and the casing can be installed quickly and accurately. At the same time, an insulating layer or insulating pad 717 is also provided on the first bracket 711 and the second bracket 712 to achieve insulation between the heat pipe 73 and the housing. In addition, a temperature measuring hole 718 and a pressure measuring hole 719 are provided at both ends or one end of the bracket body 71 . The temperature measuring hole 718 is used to install a temperature probe, and the pressure measuring hole 719 is used to install a voltage probe. The temperature measuring hole 718 and the pressure measuring hole 719 are used to install a voltage probe. The pressure hole 719 realizes installation cooperation with the battery BMS, making the integrated mounting bracket more versatile. In order to achieve sealing between adjacent battery covers, the bracket body 71 is also provided with an annular sealing groove 75, and a sealing strip is provided in the annular sealing groove 75.

The heat exchange device 72 in this embodiment can be a device of different structural forms, as long as it can realize heat exchange between the heat pipe 73 and the temperature control device. At the same time, if the heat pipe 73 is a conductive component, insulation between the heat pipe 73 and the temperature control device needs to be achieved. In this embodiment, the heat exchange device 72 includes a support pressure plate 721 and an insulating heat exchange plate 722. The heat pipe 73 is provided on the support pressure plate 721, and the temperature control tube 79 of the temperature control device is also provided on the support pressure plate 721. An insulating heat exchange plate 722 is arranged between the two supporting pressure plates 721. At this time, the heat pipe 73 is arranged on the first side of the insulating heat exchange plate 722, and the temperature control tube 79 is arranged on the second side of the insulating heat exchange plate 722. That is to say , the heat pipe 73 and the temperature control pipe 79 are arranged on both sides of the insulating heat exchange plate 722.

In this embodiment, the above-mentioned supporting pressure plate 721 is an integrated structure with the first bracket 711 and the second bracket 712. At this time, an insulating heat exchange plate 722 and two heat transfer plates 723 are provided between the two supporting pressure plates 721. The heat plate 722 realizes the insulation between the temperature control tube 79 and the heat pipe 73. The heat transfer plate 723 is used to install the temperature control tube 79 and the heat pipe 73. During installation, one end of the heat pipe 73 is embedded in the support plate 721 and the heat transfer plate. In the groove between 723, the other end passes through the support pressure plate 721 and is set on the bracket body 71. In addition, support ribs can be provided on the first bracket 711, the second bracket 712 and the support pressure plate 721, so that the installation of the support pressure plate 721 is easier. Stable, the support ribs are integrated with the first bracket 711, the second bracket 712 and the support plate 721 during processing.

Preferably, the insulating heat exchange plate 722 is a thermally conductive ceramic plate. Specifically, the thermally conductive ceramic plate can be an alumina ceramic plate, a silicon nitride ceramic plate, a zirconia ceramic plate, a silicon carbide ceramic plate, a magnesium oxide ceramic plate, or a boron nitride ceramic plate. One of ceramic plates, aluminum nitride ceramic plates, and beryllium oxide ceramic plates. This embodiment uses thermally conductive ceramic The ceramic plate realizes heat transfer. The thermally conductive ceramic plate has excellent heat conduction efficiency and good insulation performance at the same time, so that the heat exchange device 72 has good heat conduction performance and insulation performance while also having a simple structure, volume and quality. Minor advantages.

In order to further increase the heat exchange performance of the insulating heat exchange plate 722 and facilitate its disassembly and installation, heat transfer plates 723 can also be provided on both sides of the insulating heat exchange plate 722. The heat transfer plate 723 and the supporting pressure plate 721 are provided with The heat pipe 73 and the temperature control tube 79 are arranged in the groove. The heat transfer plate 723 may be a plate-shaped structure with good thermal conductivity, such as an aluminum plate, etc. At this time, a groove can be provided on the heat transfer plate 723 for installing the temperature control tube 79 and the heat pipe 73 . The addition of the heat transfer plate 723 can allow grooves to be provided on the heat transfer plate 723. At this time, the insulating heat exchange plate 722 does not need to be provided with temperature control grooves, and the insulating heat exchange plate 722 can be optimized into a flat plate structure, so that the insulating heat exchange plate 722 The structure is simpler and the production cost is greatly reduced. The shape of the above-mentioned groove can be various, as long as the temperature control tube 79 and the heat pipe 73 can be in close contact with the supporting plate 721 and the heat transfer plate 723 respectively. Preferably, the above-mentioned groove is a semicircular groove or an arcuate groove, and the heat pipe 73 and the temperature control tube 79 are extruded and deformed in the groove so that they are in close contact with the supporting pressure plate 721 and the heat transfer plate 723 to achieve good For heat exchange and stable installation, the above-mentioned supporting pressure plate 721 can be made of insulating materials, such as plastic pressure plates.

In this embodiment, the integrated mounting bracket is provided with four mounting holes, which are respectively installed on the four positioning pillars of the housing. There are 9 grooves inside the battery bracket for installing the conductive pipe 74 and the heat pipe 73. The spacing between the grooves is respectively Corresponding to the spacing between the battery cover installation grooves, heat exchange devices 72 are installed at both ends of the battery bracket. On-site installation can be done by directly installing the liquid cooling pipe in the guide groove of the heat exchange device 72.

Example 10

As shown in Figures 39 to 47, the large-capacity battery pack provided by this embodiment includes an upper pressure plate 82, a lower pressure plate 83 and a plurality of large-capacity batteries 81. The large-capacity battery 81 includes a battery pack, a casing 812, and a first cover. plate 813 and the second cover 814; the battery core group includes a plurality of single cells 811, and the plurality of single cells 811 are arranged in a battery formed by the casing 812, the first cover 813 and the second cover 814. inside the casing, and the first cover 813 and the second cover 814 are respectively the positive pole and the negative pole of the large-capacity battery 81; multiple large-capacity batteries 81 are stacked sequentially from top to bottom, and the third of adjacent large-capacity batteries 81 A cover plate 813 and a second cover plate 814 are electrically connected to realize the series connection of adjacent large-capacity batteries 81 .

In this embodiment, the large-capacity battery packs are stacked in the height direction, and the positive electrode of the lower large-capacity battery 81 and the negative electrode of the previous large-capacity battery 81 are reliably electrically connected in the following manner: placed between the two poles to be squeezed and deformed. The conductive tube realizes the electrical connection between adjacent large-capacity batteries; or, the first cover 813 and the second cover 814 of the large-capacity battery 81 are provided with conductive protrusions 817, and the adjacent large-capacity battery 81 is provided with conductive protrusions 817. The conductive protrusions 817 are pressed between the first cover 813 and the second cover 814 of the battery 81 to achieve electrical connection between adjacent large capacities. In addition, a heat pipe is provided between the first cover plate 813 and the second cover plate 814 of the adjacent large-capacity battery 81 , and the heat pipe is used to control the temperature of the large-capacity battery 81 .

In this embodiment, in order to improve the rigidity of the top and bottom large-capacity batteries 81 in the series-connected large-capacity battery pack against internal pressure, top and bottom batteries are respectively added to the top of the top large-capacity battery 81 and the bottom of the bottom large-capacity battery 81 The upper pressure plate 82 and the lower pressure plate 83. During specific installation, the upper pressure plate 82 is disposed above the first cover 813 of the top large-capacity battery 81 and is fixedly connected to the shell 812 of the top large-capacity battery 81 through bolts for reliably locking the top large-capacity battery 81 . ; The lower pressure plate 83 is provided below the second cover 814 of the bottom large-capacity battery 81, and is fixedly connected with the shell 812 of the bottom large-capacity battery 81 through bolts, for reliably locking the bottom large-capacity battery 81. .

The above-mentioned upper pressing plate 82 and lower pressing plate 83 can be made of non-metallic materials, as long as they have a certain rigidity, or they can also be made of metallic materials. At this time, an insulating plate is also provided between the upper pressure plate 82 and the first cover 813 of the top large-capacity battery 81, and an insulating plate is also provided between the lower pressure plate 83 and the second cover 814 of the bottom large-capacity battery 81. The insulating plate prevents the upper pressure plate 82 and the lower pressure plate 83 from being charged and causing danger. The above-mentioned upper pressure plate 82 and lower pressure plate 83 mainly have two functions: firstly, they can undertake and offset the outward expansion pressure when the top and bottom surfaces of the large-capacity battery pack are thermally runaway; secondly, they can also provide an electrical connection substrate between the large-capacity battery packs. , realizing series connection between adjacent large-capacity battery packs.

The housing 812 of the large-capacity battery 81 is provided with a connection hole 815, and a fastener 816 is provided in the connection hole 815, so that the housings 812 of adjacent large-capacity batteries 81 are connected through the fastener 816. The two large-capacity batteries 81 are locked by fasteners 816 (such as bolt assemblies), causing the upper and lower poles to squeeze each other. In this way, due to the locking force of the outer shell 812, the two poles squeeze each other. Pressure becomes the internal force of the system. When the pole expands outward due to rising internal temperature of the battery or thermal runaway, another pole will effectively suppress or offset the expansion of the pole. That is to say, after the two large-capacity batteries 81 are locked by the end-face bolt assembly, they will become one body, that is, the end face of one large-capacity battery 81 and the end face of the other large-capacity battery 81 are locked into one body, so that the two batteries The end face system and pole system will be reinforced by each other. Compared with an independent single large-capacity battery 81, the stiffness of the surrounding sides of the reinforced large-capacity battery will be greatly improved, thereby improving the ability of the battery's surrounding sides to resist internal pressure deformation.

In order to improve the rigidity of the top large-capacity battery 81 and the bottom large-capacity battery 81 in the large-capacity battery pack against internal pressure, an upper pressure plate 82 and a lower pressure plate are respectively added to the top of the top large-capacity battery 81 and the bottom of the bottom large-capacity battery 81 83, the connection between the upper pressure plate 82, the lower pressure plate 83 and the housing 812 is similar to the middle large The locking method of the capacity battery 81 is that the upper pressure plate 82 is reliably locked with the top large-capacity battery 81, and the lower pressure plate 83 is reliably locked with the bottom large-capacity battery 81. In this way, just like the middle large-capacity battery 81, the top and bottom large-capacity batteries Battery 81 is also effectively improved in its ability to suppress battery internal pressure.

In this embodiment, the large-capacity battery packs are stacked in the height direction, and the positive electrode of the next large-capacity battery 81 and the negative electrode of the previous large-capacity battery 81 are reliably electrically connected in the following two ways: 1). Between the two poles The extruded and deformed conductive tube is placed in between; 2), the contact surface of the two poles is reliably connected through the extrusion plastic deformation of the "bulge" and the "flat surface". Specifically, the first cover 813 and the second cover 814 of the large-capacity battery 81 are provided with conductive protrusions 817, and the first cover 813 and the second cover 814 of adjacent large-capacity batteries 81 are connected by conductive protrusions. 817 is pressed to realize the electrical connection of adjacent large-capacity batteries 81 . At this time, the surface of the upper pressure plate 82 that is in contact with the first cover plate 813 is provided with a mounting groove matching the conductive protrusion 817 , and the surface of the lower pressure plate 83 that is in contact with the second cover plate 814 is also provided with a conductive protrusion 817 With matching installation grooves, the upper pressure plate 82 and the first cover plate 813, and the lower pressure plate 83 and the second cover plate 814 achieve stable installation through the conductive protrusions 817 and the installation grooves. In addition, a heat pipe may be provided between the first cover plate 813 and the second cover plate 814 of the adjacent large-capacity battery 81 , and the heat pipe can control the temperature of the large-capacity battery 81 .

In this embodiment, locking structures are designed at the bottom and top of the large-capacity battery pack to reliably lock the large-capacity battery pack and its surrounding containers. Specifically, in this embodiment, the upper pressure plate 82 and the lower pressure plate 83 are both provided with a fixing assembly 84. The fixing assembly 84 includes a locking frame 841 and a locking bracket 842. The locking frame 841 is fixedly connected to the upper pressure plate 82 or the lower pressure plate 83. Locking brackets 842 are provided at both ends of the locking frame 841 and are used to connect with the container, thereby firmly connecting the large-capacity battery pack to the container. In addition, the lower pressure plate 83 is also provided with a mounting plate 843, and the bottom of the mounting plate 843 is provided with a universal wheel 85 for installation, transportation and maintenance of the large-capacity battery pack.

As shown in Figures 44 to 47, this embodiment can also apply large-capacity battery packs to energy storage devices. The energy storage device includes a container and M sets of large-capacity battery packs arranged in the container. The M sets of large-capacity battery packs are Encapsulation is achieved through the container body. In the energy storage device, the top and bottom ends of the large-capacity battery pack have electrical connection structures to connect with other large-capacity battery packs.

Adjacent large-capacity battery packs are connected in series in the following manner. At this time, the first cover 813 of the large-capacity battery 81 at the top of the i-1th large-capacity battery pack is the negative pole, and the second cover 814 of the large-capacity battery 81 at the bottom is the positive pole. The i-th large-capacity battery pack The first cover 813 of the top large-capacity battery 81 is the positive pole, the second cover 814 of the bottom large-capacity battery 81 is the negative pole, and the first cover 813 of the top large-capacity battery 81 of the i+1th large-capacity battery pack is 813 is the negative pole, the second cover 814 of the bottom large-capacity battery 81 is the positive pole, the i-1th large-capacity battery group, the i-1th large-capacity battery group and the i+1th large-capacity battery group The groups are connected in series through conductive connectors, which may specifically be conductive connection rows 86 or conductive cables 87 . First conductive teeth 861 are respectively provided at both ends of the conductive connection row 86. Second conductive teeth 821 are provided on the positive and negative poles of the adjacent large-capacity battery 81 extending to the outside of the housing 812. The first conductive teeth 861 and the The two conductive teeth 821 are disposed in an offset position and are plastically deformed by extrusion, thereby realizing series connection between adjacent large-capacity battery packs. Alternatively, the i-th large-capacity battery pack and the i+1-th large-capacity battery pack are electrically connected through a conductive cable 87. Both ends of the conductive cable 87 extend from the adjacent large-capacity battery 81 to the housing 812. The positive and negative poles on the outside are connected to achieve series connection between adjacent large-capacity battery packs.

Claims

A large-capacity battery pack, including at least two large-capacity batteries, characterized in that the large-capacity battery includes a casing, a battery pack placed in the casing, and covers located on opposite sides of the casing. The cover The plate includes a first cover plate and a second cover plate. The first cover plate is the positive pole of the large-capacity battery. The second cover plate is the negative pole of the large-capacity battery. The positive pole of the battery pack is connected to the positive pole of the battery pack. The first cover plate is electrically connected, the negative pole of the battery cell group is electrically connected to the second cover plate, and adjacent large-capacity batteries are electrically connected through the first cover plate and the second cover plate.
The large-capacity battery pack according to claim 1, further comprising a temperature control device, the temperature control device including a temperature control unit, an input pipeline, an output pipeline and a heat transfer pipeline, the input pipeline, the output pipeline and The temperature control unit is connected, and the heat transfer pipe is arranged between the pole connection surfaces of two adjacent large-capacity batteries. There is a heat transfer medium in the heat transfer pipe to exchange heat with the poles.
The large-capacity battery pack according to claim 2, wherein the heat transfer pipe is in contact with the connection surface of the pole, and a groove is provided on the connection surface of the pole to accommodate the heat transfer pipe, and the heat transfer pipe is in contact with the connection surface of the pole. The cross-section of the pipe is circular, the width of the groove is not less than the diameter of the heat transfer pipe, the height of the groove is less than the radius of the heat transfer pipe, the cross-sectional area of the groove is not less than half of the cross-sectional area of the heat transfer pipe, and the cross-section of the groove is half Oval.
The large-capacity battery pack according to claim 2, wherein the heat transfer pipe is a metal pipe, the input pipe and the output pipe are provided with an insulating portion, and the heat transfer medium is an insulating medium.
The large-capacity battery pack according to claim 2, wherein the heat transfer pipe is made of insulating material.
The large-capacity battery pack according to claim 1, further comprising a conductive component disposed between poles connecting two large-capacity batteries, and the conductive component is in electrical contact with the poles.
The large-capacity battery pack according to claim 6, wherein a fastening device is provided on the housing to make the conductive component closely contact the pole, and a groove is provided on the pole to Secure conductive components.
The large-capacity battery pack according to claim 7, wherein the conductive component is a metal tube, the metal tube is a hollow tube, the metal tube has a circular cross-section, and the groove width is not less than that of the metal tube. diameter, the height of the groove is less than the radius of the metal pipe, the cross-sectional area of the groove is greater than half of the cross-sectional area of the metal pipe, and the cross-section of the groove is semi-elliptical.
The large-capacity battery pack according to claim 1, further comprising a conductive device; the conductive device includes at least one conductive tube; and the poles of the large-capacity battery are provided with at least one conductive tube that matches the shape of the conductive tube. Grooves, adjacent large-capacity batteries are superimposed, so that the two grooves form an installation cavity. The conductive tube is arranged in the installation cavity and is in surface contact with the installation cavity; at least one airtight seal is provided in the conductive tube. Cavity, a phase change material is provided in the sealed cavity for realizing temperature regulation.
The large-capacity battery pack according to claim 9, wherein the phase change material has a first state and a second state, the first state is a solid state, the second state is a liquid state, and the phase change material The material can support the side walls of the conductive tube.
The large-capacity battery pack according to claim 10, wherein the phase change point temperature at which the phase change material transitions from the first state to the second state is 30°C to 52°C.
The large-capacity battery pack according to claim 10, characterized in that the conductive tube is an elliptical tube or a flat tube, and the phase change material is polyol, fatty acid, crystalline hydrated salt, multi-component alloy, or alkanes. One or more, the polyhydric alcohol includes one or more of tetradecanol, neopentyl glycol, and pentaerythritol; the fatty acid includes one or more of lauric acid, myristic acid, and palmitic acid, The crystalline hydrated salt includes one or more of alkali metal hydrated salts, alkaline earth metal hydrated salts, nitrates, sulfates, phosphates, carbonates, acetates, and thiosulfates.
The large-capacity battery pack according to claim 10, wherein the conductive tube is one or more of copper tubes, aluminum tubes and stainless steel tubes, and a conductive tube is further provided between the conductive tube and the installation cavity. Conductive plastic.
The large-capacity battery pack according to claim 1, further comprising a conductive connection device; one end of the positive pole and the negative pole of the adjacent large-capacity battery extends to the outside of the casing, and the conductive connection device includes at least one Conductive connection piece, the two ends of the conductive connection piece are electrically connected to the positive pole and negative pole of the adjacent battery extending to the outside of the housing, so as to realize the series connection of adjacent large-capacity batteries.
The large-capacity battery pack according to claim 14, wherein the conductive connecting piece is provided with a plurality of spaced-apart grooves on its end surface close to the positive pole or the negative pole, and the grooves are adjacent to each other. The flat surface is the first conductive surface, and a plurality of grooves arranged at intervals are provided on the end surfaces of the positive pole and the negative pole close to the conductive connecting piece, and the flat surface adjacent to the grooves is the second conductive surface; the first conductive surface The second conductive surfaces correspond to each other and are arranged oppositely to form multiple groups of conductive surfaces. At least one conductive tooth is provided on the first conductive surface or the second conductive surface of each group of conductive surfaces. The conductive teeth press The second conductive surface or the first conductive surface produces plastic deformation to achieve stable series connection.
The large-capacity battery pack according to claim 15, wherein the conductive teeth are arranged continuously or at intervals along the width direction of the conductive connecting piece, and the size of the end of the conductive teeth close to the conductive surface is larger than the size of the end far away from the conductive surface. Size, the end of the conductive teeth close to the conductive surface has an arc surface structure, or the conductive teeth have a trapezoidal platform structure, which facilitates plastic deformation due to extrusion.
The large-capacity battery pack according to claim 13, characterized in that the conductive connection device includes a conductive connecting piece and two sets of conductive cables, one end of the two sets of conductive cables is connected to the positive pole or the positive pole of the adjacent battery respectively. The negative pole is electrically connected, and the other ends of the two sets of conductive cables are electrically connected to the conductive connecting piece. The conductive connecting piece is provided with a mounting hole, and the conductive cable is installed through at least one of wiring lugs, welding, and bolts. The hole realizes electrical connection with the conductive connecting piece.
The large-capacity battery pack according to claim 13, wherein one end of the positive pole and the negative pole extends to the outside of the housing, and the conductive connection device is a conductive cable, and the conductive cable The two ends are electrically connected to the positive pole and the negative pole respectively through at least one of connecting noses, welding, bolts, and fixing clips.
The large-capacity battery pack according to claim 1, further comprising a conductive connection device disposed between large-capacity batteries placed side by side to achieve electrical connection between the large-capacity batteries; The conductive connection device includes N conductive connection pieces, N is an integer greater than or equal to 2; the N conductive connection pieces are spaced apart along the stacking direction of the battery pack in the large-capacity battery; the two ends of the N conductive connection pieces are arranged side by side. Place the high-capacity battery's poles electrically connected.
The large-capacity battery pack according to claim 19, characterized in that: the N conductive connecting pieces are insulated from each other, and the conductive connecting pieces are provided with an insulating sleeve or an insulating layer.
The large-capacity battery pack according to claim 19, characterized in that: the area of the N conductive connecting pieces electrically connected to the large-capacity battery poles is the same, and the N conductive connecting pieces have the same thickness and width, realizing the N conductive connecting pieces. conductive balance.
The large-capacity battery pack according to claim 19, wherein each conductive connection piece includes two conductive connection parts arranged in mirror images; the conductive connection parts include a first conductive connection area, a first conductive connection area, and a third conductive connection area that are connected in sequence after being bent. two conductive connection areas, a third conductive connection area and a fourth conductive connection area; the first conductive connection area is used to be fixedly attached to the pole of the large-capacity battery, and the fourth conductive connection areas of the two conductive connection parts are mutually Cooperate to achieve electrical connection between large capacity batteries.
The large-capacity battery pack according to claim 22, wherein the first conductive connection area and the pole side of the large-capacity battery are electrically connected by welding, and the fourth conductive connection areas of the two conductive connection parts are embedded in each other. Finally, the electrical connection is realized through bolt connection.
The large-capacity battery pack according to claim 19, characterized in that adjacent large-capacity batteries are connected in series through two sets of conductive connection devices, wherein one set of conductive connection devices is provided at one end of the large-capacity battery, and the other set of conductive connection devices is The connection device is provided at the other end of the large-capacity battery.
The large-capacity battery pack according to claim 1, wherein a functional component is further included between adjacent large-capacity batteries, the functional component includes a functional part and a fixing part, and the functional part includes at least one pipe, so The pipeline can conduct electricity and/or heat; the fixing part cannot conduct electricity; the fixing part is set in a frame shape, and at least two ends of the pipe are clamped and fixed by the fixing part along its axial direction; the first cover plate The second cover plate is provided with a groove to accommodate the functional part of the functional component, and the two ends of the housing are provided with supporting parts along the circumferential direction to seal and install the fixed part of the functional component.
The large-capacity battery pack according to claim 25, wherein a cavity is provided inside the pipe, and a heat-conducting medium is provided in the cavity.
The large-capacity battery pack according to claim 26, wherein the fixed part is further provided with a temperature control device to control the temperature of the pipeline, and the temperature control device is a liquid cooler or a semiconductor refrigerator.
The large-capacity battery pack according to claim 25, wherein the functional part includes electrically conductive pipes and thermally conductive pipes, and the electrically conductive pipes and thermally conductive pipes are laid alternately.
The large-capacity battery pack according to claim 25, wherein the fixing part has elasticity, so that the first cover plate and the second cover plate are sealed and mounted on the fixing part.
The large-capacity battery pack according to claim 1, further comprising an integrated mounting bracket, the integrated mounting bracket includes a bracket body and a heat exchange device; the integrated mounting bracket is arranged on an adjacent large-capacity battery between the first cover plate and the second cover plate, and at least one heat pipe is provided in the installation groove of the integrated mounting bracket, or at least one heat pipe and a conductive pipe are provided; the bracket body is an insulating piece, and is provided on the inside There is a mounting groove, which is used to install heat pipes and/or conductive pipes; the heat exchange device is arranged at one or both ends of the bracket body and is used to realize heat exchange between the heat pipe and the temperature control device.
The large-capacity battery pack according to claim 30, wherein the bracket body includes a first bracket, a second bracket and a bracket side plate, and the first bracket and the second bracket are connected through at least one bracket side plate, The mounting groove is located on the first bracket and the second bracket.
The large-capacity battery pack according to claim 31, wherein the first bracket and the second bracket are further provided with an insulating layer or an insulating pad to achieve insulation between the heat pipe and the casing.
The large-capacity battery pack according to claim 30, characterized in that: the bracket body A temperature measuring hole and a pressure measuring hole are provided at both ends or one end. The temperature measuring hole is used to install a temperature probe, and the pressure measuring hole is used to install a voltage probe.
The large-capacity battery pack according to claim 31, wherein the heat exchange device includes a support pressure plate and an insulating heat exchange plate, the support pressure plate is integrally provided with the first bracket and the second bracket, and the support pressure plate and Heat transfer plates are also provided between the insulating heat exchange plates.
The large-capacity battery pack according to claim 1, further comprising an upper pressure plate and a lower pressure plate; N large-capacity batteries are stacked sequentially from top to bottom, and the upper pressure plate is arranged on the first side of the top large-capacity battery. above the cover, and is fixedly connected to the shell of the top large-capacity battery, for reliably locking the top large-capacity battery; the lower pressure plate is arranged below the second cover of the bottom large-capacity battery, and is connected to the bottom The shell of the large-capacity battery is fixedly connected, which is used to reliably lock the large-capacity battery at the bottom.
The large-capacity battery pack according to claim 35, wherein the upper pressure plate and the lower pressure plate are each provided with a fixing assembly, the fixing assembly includes a locking frame and a locking bracket, and the locking frame is connected to the upper pressure plate. The pressure plate and the lower pressure plate are fixedly connected, and the locking brackets are provided at both ends of the locking frame for connection with the container. The lower pressure plate is also provided with a mounting plate, and the bottom of the installation plate is provided with a universal wheel.
The large-capacity battery pack according to claim 35, characterized in that the housing of the large-capacity battery is provided with a connection hole, and a fastener is provided in the connection hole so that the housing of the adjacent large-capacity battery The connection is achieved through fasteners.
The large-capacity battery pack according to claim 35, characterized in that an insulating plate is provided between the upper pressure plate and the first cover plate of the top large-capacity battery, and the lower pressure plate and the third cover plate of the bottom large-capacity battery An insulating plate is also provided between the two cover plates.
The large-capacity battery pack according to claim 35, wherein the first cover plate and the second cover plate of the large-capacity battery are provided with conductive protrusions, and the first cover plate and the second cover plate of the adjacent large-capacity battery are provided with conductive protrusions. The electrical connection between adjacent large-capacity batteries is realized by extrusion of conductive protrusions between the two cover plates. At the same time, the upper pressure plate and the lower pressure plate are provided with installation grooves matching the conductive protrusions. The upper pressure plate is connected to the first The cover plate, the lower pressure plate and the second cover plate are firmly installed through the cooperation of the conductive protrusions and the installation grooves.