CN220934301U

CN220934301U - Battery pack and energy storage device

Info

Publication number: CN220934301U
Application number: CN202322053675.XU
Authority: CN
Inventors: 陶洪彬; 张欢; 吴建; 罗明; 罗文�
Original assignee: Huawei Digital Power Technologies Co Ltd
Current assignee: Huawei Digital Power Technologies Co Ltd
Priority date: 2023-07-31
Filing date: 2023-07-31
Publication date: 2024-05-10
Anticipated expiration: 2033-07-31

Abstract

The embodiment of the application provides a battery pack and an energy storage device. The battery pack comprises a first shell, a second shell, a battery module and a power module, wherein the first shell is used for accommodating the power module, the second shell is used for accommodating the battery module, the first shell is positioned outside the second shell, and the first shell and the second shell are arranged in parallel and fixedly connected; the power module is electrically connected with the battery module through a power connection row and is used for carrying out power conversion on the battery module. In the application, the power module is accommodated in the first shell, and the battery module is accommodated in the second shell, namely, the power module and the battery module are arranged in the component cavities, so that the mutual influence of the battery module and the power module due to factors such as ambient temperature and the like is reduced, the possibility of condensation formed on the power module is reduced in areas with large ambient temperature difference and high air humidity, the possibility of faults such as short circuit and failure of devices in the power module is reduced, and the safety and reliability of the battery pack are improved.

Description

Battery pack and energy storage device

Technical Field

The application relates to the technical field of energy storage, in particular to a battery pack and an energy storage device.

Background

The battery pack generally includes a battery module and a power module. The battery module and the power module are usually placed in a common structural cavity, i.e., the battery module and the power module are arranged in the same housing. However, compared with a power module, the battery module has large mass and specific heat, and in areas with large environmental temperature difference and high air humidity, condensation is generated on the battery module and the power module nearby, so that the electric insulation performance of the power module is reduced, and the safety and the reliability of the battery pack are affected. For example, condensation may cause short-circuit, failure, etc. of devices in the power module, and further, may cause serious accidents such as fire.

Disclosure of utility model

The embodiment of the application provides a battery pack and an energy storage device, which can be beneficial to improving the safety and reliability.

In a first aspect, an embodiment of the present application provides a battery pack, where the battery pack includes a first housing, a second housing, a battery module, and a power module, the first housing is configured to accommodate the power module, the second housing is configured to accommodate the battery module, the first housing is located outside the second housing, and the first housing and the second housing are arranged in parallel and are fixedly connected; the power module is electrically connected with the battery module through a power connection row and is used for carrying out power conversion on the battery module.

In the application, the power module is accommodated in the first shell, and the battery module is accommodated in the second shell, namely, the power module and the battery module are arranged in the component cavities, so that the mutual influence of the battery module and the power module due to factors such as ambient temperature and the like is reduced, the possibility of condensation formed on the power module is reduced in areas with large ambient temperature difference and high air humidity, the possibility of faults such as short circuit and failure of devices in the power module is reduced, and the safety and reliability of the battery pack are improved.

In a possible implementation manner of the present application, the power connection row extends along an arrangement direction of the first housing and the second housing, and the power connection row includes two ends along the extension direction of the power connection row, wherein one end is electrically connected to the power module, and the other end is electrically connected to the battery module.

In this possible implementation manner, the power module and the battery module are connected through the power connection row extending along the arrangement direction of the first housing and the second housing, which is advantageous in improving the convenience of the electrical connection between the power module and the battery module.

In a possible implementation of the application according to the first aspect, the power connection rows comprise telescopic bending structures, which are arranged along the extension direction of the power connection rows.

In this possible implementation, the telescopic bending structure enables the power connection rows to have tensile and compressive properties, and in the process of assembly, the telescopic power connection rows can reduce the possibility of structural damage to the power connection rows due to stress problems.

According to a first aspect, in one possible implementation manner of the present application, a battery module includes a plurality of electric cells and a bracket, and poles of the plurality of electric cells are fixed on the bracket; the support is including the extension that stretches out battery module, and the extension is followed the second casing with the range direction of first casing extends, and the extension is equipped with the recess, and the recess is used for holding the kink structure of power connection row.

In this possible implementation manner, the bending structure is accommodated in the groove, so that when the power connection row is stretched or compressed, the power connection row can deform along the groove, that is, the groove limits the deformation direction of the power connection row, which is beneficial to reducing the possibility of changing the relative position between the power connection row and the battery module, and improving the electrical connection stability between the power connection row and the battery module.

In a possible implementation manner of the present application, according to the first aspect, the plurality of electric cells are electrically connected through conductive connection pieces, the poles of the plurality of electric cells are all located on the same plane, and a part of the conductive connection pieces is electrically connected with the other end of the power connection row.

In this possible implementation, the conductive tabs are used to electrically connect a plurality of cells.

In a possible implementation manner of the present application, according to the first aspect, the power module includes a power terminal, the power terminal is electrically connected to one end of the power connection row, and an arrangement direction of the power terminal, the power connection row, and a portion of the conductive connection piece is parallel to an arrangement direction of the first housing and the second housing.

In this possible implementation, the number of components of the battery pack is simplified, since the power terminals are directly connected to the power connection rows.

In a possible implementation manner of the present application, according to the first aspect, the power module includes a switching row and a power terminal, the power terminal is electrically connected to one end of the switching row, and the other end of the switching row is connected to one end of the power connection row.

In the possible implementation manner, the connection between the power terminal and the power connection row is realized through the switching row, so that the limitation of the position of the power terminal on the battery pack can be reduced, the position flexibility of the power terminal arranged on the power module is improved, and the layout flexibility of the battery pack is improved. For example, in the height direction of the battery pack, the power terminal may be disposed at one end of the battery pack near the bottom, the power connection row is disposed at the top of the battery pack, and the switching row can span the internal space of the battery pack, so as to realize electrical connection between the power terminal and the power connection row.

In a possible implementation manner of the present application, according to the first aspect, the arrangement direction of the other end of the transfer row, the power connection row and a part of the conductive connection pieces is parallel to the arrangement direction of the first housing and the second housing.

In this possible implementation manner, the arrangement direction of the other end of the transfer line, the power connection line and a part of the conductive connecting pieces is parallel to the arrangement direction of the first shell and the second shell, which is favorable for reducing the pulling of the transfer line on the power connection line and improving the electrical connection stability between the power connection line and the battery module and between the transfer line and the power connection line.

According to a first aspect, in a possible implementation manner of the present application, the battery pack further includes a partition, a side of the first housing facing the second housing is provided with a first opening, the partition is fixedly and hermetically connected with the first housing, the partition is located between the power module and the battery module, and the partition covers the first opening.

In this possible implementation manner, the partition piece is fixed and sealing connection with first casing, the battery compartment is enclosed jointly to second casing, the first casing, the partition piece encloses into the electric storehouse jointly, battery module and power module have realized physical isolation in the space through the partition piece, the air current circulation and the heat transmission between battery compartment and the electric storehouse have been reduced, in this way, when the battery module appears the condensation because of factors such as environment, the possibility that the power module produced the condensation has further been reduced, thereby the device short circuit in the power module, the possibility of trouble such as inefficacy has been reduced, be favorable to improving the fail safe nature of battery package. In addition, when the valve is opened and the thermal runaway occurs in the battery module, due to the blocking effect of the separating piece, the gas circulation between the battery compartment and the electric compartment is reduced, and the possibility of insulation failure and electric arc discharge of the power module caused by smoke and the like of the battery module is reduced.

In addition, the heat generated by partial devices of the power module during operation is large, the heat transfer between the battery compartment and the electric compartment is reduced due to the blocking effect of the separating piece, the influence of the heat generated by the power module on the battery module is reduced, the possibility of valve opening and thermal runaway faults of the battery module is also reduced, and the service life of the battery module is prolonged.

In addition, when the power module has faults such as arc discharge, ignition or carbonization, the faults of the power module can not directly affect the battery module due to the blocking effect of the separating piece, so that the safety level of the battery pack can be improved.

Furthermore, among a plurality of battery packs, because the battery module of each battery pack is located in an independent battery compartment, when the battery module of one battery pack has faults such as thermal runaway, electrolyte, smoke and the like of the failed battery module are blocked in the battery compartment, the possibility that the electrolyte and the smoke of the failed battery module diffuse to other battery packs is reduced, and the safety and the reliability of the energy storage device are improved.

When the battery pack is assembled, the power module can be assembled in the inner cavity of the first shell, and then the partition piece and the first shell are assembled together. I.e. the power module, the first housing, the partition may form one electrical module. In the actual production process, after the assembly test of the electric module and the battery module on the corresponding production line is completed, the electric module and the battery module are transported to the final assembly production line for assembly, so that the assembly time of the electric module and the battery module can be reduced, and the assembly efficiency is improved. In addition, because the battery module and the electric module adopt modularized design, the reduction of connecting pieces among the modules is realized through high integration in the module, the failure probability of parts among the modules can be effectively reduced, and the reliability of the battery pack is improved. In addition, if one of the battery modules or the electric modules in the battery pack fails or needs to be replaced due to other reasons, the battery modules or the electric modules can be directly and quickly replaced, and the manufacturing and the maintenance of the battery pack are facilitated.

According to a first aspect, in one possible implementation of the application, the first housing is provided with a first step surface and a second step surface around the periphery of the first opening, the first step surface and the second step surface being provided around the periphery of the first opening, the first step surface being closer to the second housing than the second step surface; the first step surface is connected with the second shell, and the second step surface is connected with the partition piece.

In this possible implementation manner, the first step surface and the second step surface are arranged on the first shell around the first opening, so that the separator can be hidden in the cavity formed by the first shell and the second shell, which is beneficial to protecting the separator and reducing the influence of the environment where the battery pack is located on the separator.

In one possible implementation manner of the present application, according to the first aspect, the battery pack further includes a first sealing member, and a first groove is disposed on the first step surface around the periphery of the first opening, and the first sealing member is embedded in the first groove.

In this possible implementation manner, the first sealing member is used for realizing sealing connection between the first casing and the second casing, prevents dust and steam from entering the inside of the battery pack from between the terminal surface of the first casing and the terminal surface of the second casing, has improved the sealing performance of battery pack. In addition, the first groove limits the first sealing element, so that the possibility of movement of the first sealing element relative to the first shell is reduced. Also, due to the presence of the first groove, the first groove is able to locate the first seal when assembled, facilitating the assembly of the first seal between the second housing and the first housing.

In one possible implementation manner of the present application, according to the first aspect, the battery pack further includes a second sealing member, and a second groove is disposed on the second step surface around the first opening, and the second sealing member is embedded in the second groove.

In this possible implementation manner, the second sealing member is used for realizing sealing connection between the first shell and the partition member, so that dust and water vapor are prevented from entering the interior of the electrical bin enclosed by the first shell and the partition member from between the end face of the first shell and the end face of the partition member. In addition, the second groove limits the second sealing element, so that the possibility of movement of the second sealing element relative to the first shell is reduced. Also, due to the presence of the second groove, the second groove is able to locate the second seal when assembled, facilitating the assembly of the second seal between the first housing and the partition.

According to a first aspect of the application, in a possible implementation manner of the application, the second housing is provided with a second opening, a flange protruding towards the inside of the second housing is arranged at the periphery of the second opening, the flange is arranged opposite to and fixedly connected with the first step surface, and the first sealing element is arranged between the first step surface and the flange.

In this possible implementation, the flange can reduce the ingress of moisture and the like into the interior cavity of the second housing. Through flange and first casing fixed connection, can increase the area of contact of second casing and first casing, improve the connection stability between second casing and the first casing.

According to a first aspect, in one possible implementation manner of the present application, the power module includes a circuit board and a power terminal disposed on the circuit board, a first through hole is disposed on the partition member, the power terminal is electrically connected with the battery module through the first through hole, the battery pack further includes a third sealing member sleeved on the periphery of the power terminal, and the third sealing member is fixed between the partition member and the circuit board and disposed around the first through hole.

In this possible implementation manner, the third sealing member is fixed between the power module and the partition member and surrounds the first through hole, so that the third sealing member, the power module and the partition member enclose a channel which is spatially isolated from the electrical bin, that is, the third sealing member seals the first through hole, and therefore, after the power terminal is electrically connected with the battery module, air flow and heat are difficult to circulate between the battery module and the power module through the first through hole, and the safety and reliability of the battery pack are further improved.

According to a first aspect, in one possible implementation manner of the present application, the power terminal includes a soldering leg and a connection end that are fixedly connected, the soldering leg is fixedly arranged on a surface of the circuit board and exposes the circuit board away from the second housing, and the connection end is located on a surface of the circuit board facing the second housing and is electrically connected with the battery module; the power module further comprises a protective colloid, wherein the protective colloid is arranged on one surface of the circuit board, which is away from the second shell, and the protective colloid covers the welding leg.

In this possible implementation manner, the protective colloid is disposed on a surface of the circuit board opposite to the battery module, and the protective colloid covers the solder fillets and a surface of the circuit board opposite to the battery module. The protective colloid is used for protecting the welding leg so as to reduce the possibility that the welding leg is melted at high temperature under the thermal runaway or other extreme conditions of the battery module.

According to a first aspect, in a possible implementation manner of the present application, the battery pack further includes a fourth sealing member, the power module further includes a signal terminal, the partition member is further provided with a second through hole, the fourth sealing member is sleeved on the periphery of the signal terminal, and the fourth sealing member is fixed between the partition member and the circuit board and is disposed around the second through hole.

In this possible implementation manner, the fourth sealing member is fixed between the power module and the partition member and surrounds the second through hole, so that the fourth sealing member, the power module and the partition member enclose a channel which is spatially isolated from the electrical bin, that is, the fourth sealing member seals the second through hole, and therefore, after the signal terminal is electrically connected with the battery module, air flow and heat are difficult to circulate between the battery module and the power module through the second through hole, and the safety and reliability of the battery pack are further improved.

According to a first aspect, in a possible implementation manner of the present application, the partition is a circuit board, a periphery of the partition is fixedly and hermetically connected with an inner wall of the first housing, and the power module includes a power device, and the power device is disposed on a side of the partition facing the first housing.

In this possible implementation, the compartments are directly formed by the circuit board, so that the number of components of the battery pack is reduced, and the occupied space of the battery pack is reduced.

In a second aspect, an embodiment of the present application further provides an energy storage device, where the energy storage device includes a plurality of the battery packs according to the first aspect, and a plurality of the battery packs are stacked.

Drawings

FIG. 1 shows a schematic frame structure of a photovoltaic system;

Fig. 2 is a schematic structural diagram of an energy storage device according to some embodiments of the present application;

Fig. 3 is a schematic view of a battery pack of an energy storage device according to some embodiments of the present application;

Fig. 4a is an exploded perspective view of the battery pack of fig. 3 according to some embodiments of the present application;

FIG. 4b is a further exploded perspective view of the battery pack of FIG. 3 according to some embodiments of the present application;

FIG. 5 is a cross-sectional view taken along line I-I of FIG. 3, provided in accordance with some embodiments of the present application;

FIG. 6 is a schematic perspective view of a first housing according to some embodiments of the present application;

Fig. 7 is a schematic view illustrating a battery pack according to some embodiments of the present application, in which a second case and a battery module are assembled together;

fig. 8 is a schematic perspective view of a second housing according to some embodiments of the present application;

Fig. 9 is a schematic perspective assembly view of a battery pack according to some embodiments of the present application with a second housing omitted;

Fig. 10 is an exploded perspective view of a first housing, a power module, and a divider according to some embodiments of the present application;

FIG. 11 is an exploded perspective view of a first housing, a power module, and a divider according to some embodiments of the present application;

FIG. 12 is a schematic diagram of a circuit board, power terminals, spacers, and protective gel according to some embodiments of the present application;

fig. 13a is an exploded perspective view of a battery pack according to an embodiment of the present application;

Fig. 13b is an exploded perspective view of the battery pack of fig. 13a from another perspective;

FIG. 14a is a partially exploded view of a battery pack according to one embodiment of the present application;

FIG. 14b is a schematic view of the battery pack of FIG. 14a from another perspective;

FIG. 15 is a schematic perspective view of a power connection bank according to some embodiments of the present application;

Fig. 16 is a perspective view illustrating a power connection and a battery module assembled together according to some embodiments of the present application;

FIG. 17 is a schematic perspective view of a first housing, divider, according to some embodiments of the present application;

FIG. 18 is an enlarged schematic view of the partial region II of FIG. 5;

FIG. 19 is a schematic perspective view of a first housing according to some embodiments of the present application;

FIG. 20 is a schematic view illustrating assembly of a first housing, a power module, and a divider according to some embodiments of the present application;

FIG. 21 is a schematic view of a separator provided in some embodiments of the present application;

FIG. 22 is a schematic cross-sectional view of a circuit board, a third seal, and a separator according to some embodiments of the present application;

Fig. 23 is a partially exploded perspective view of a battery pack according to some embodiments of the present application;

fig. 24 is a cross-sectional view of a battery pack provided in some embodiments of the present application;

fig. 25 is a cross-sectional view of a battery pack provided in some embodiments of the present application;

Fig. 26 is an exploded perspective view of a battery pack according to some embodiments of the present application;

fig. 27 is an exploded perspective view of a battery pack according to some embodiments of the present application.

Detailed Description

Fig. 1 shows a schematic frame of a photovoltaic system, as shown in fig. 1, comprising a photovoltaic array 110, a power converter 120, an energy storage device 150, and an electrical grid 130/external load 140. The power converter 120 may integrate a DC/DC conversion circuit and a DC/AC conversion circuit, the energy storage device 150 may be located between the DC/DC conversion circuit and the DC/AC conversion circuit, and the energy storage device 150 may be charged after the electric energy generated by the photovoltaic array 110 is subjected to voltage boosting or voltage reducing conversion by the DC/DC conversion circuit. When the electrical energy generated by the photovoltaic array 110 is insufficient to power the grid 130/external load 140, the electrical energy stored in the energy storage device 150 may be transferred to the grid 130/external load 140 via the DC/AC conversion circuit within the power converter 120. On the other hand, the energy storage device 150 may also receive power from the power grid 130, where the AC power output by the power grid 130 is converted into DC power by the DC/AC conversion circuit and then transferred to the energy storage device 150, so as to charge the energy storage device 150. Alternatively, the power converter 120 includes only a DC/AC conversion circuit, and the energy storage device 150 has a DC/DC conversion circuit built therein, and the energy storage device 150 directly receives the direct current power generated by the photovoltaic array 110. It can be appreciated that the energy storage device 150 may also be used in application scenarios such as wind power systems, and the application scenarios of the energy storage device 150 are not limited in the present application.

Referring to fig. 2, fig. 2 is a schematic structural diagram of an energy storage device according to some embodiments of the present application. The energy storage device 150 includes a plurality of battery packs 100, and the plurality of battery packs 100 are stacked and arranged, so that the number of battery packs 100 can be arbitrarily increased or decreased to adaptively adjust the capacity of the energy storage device 150. The battery packs 100 are electrically connected to each other through the opposite terminals.

The battery pack generally includes a battery module and a power module. The power module is used for boosting the voltage output by the battery module so as to meet larger power requirements. In the conventional technology, the battery module and the power module are usually placed in a common structural cavity. However, the same case design of the battery module and the power module causes various problems in the subsequent use of the battery pack. First, compared with a power module, the battery module has large mass and specific heat, and in areas with large environmental temperature difference and high air humidity, the capacity of the battery module and the power module nearby the battery module is condensed, so that the electric insulation performance of the power module is reduced, and the safety and the reliability of the battery pack are affected. For example, condensation may cause short-circuit, failure, etc. of devices in the power module, and further, may cause serious accidents such as fire.

Secondly, the power module can generate heat seriously when working, and the battery core of the battery module close to the power module is baked at high temperature and runs for a long time, so that the service life of the battery module is reduced, and the service life of the whole battery module is further influenced.

Thirdly, when the valve of the battery module is opened and the battery module is out of control, high temperature can be generated, for example, the high-temperature smoke at about 300 ℃ can cause insulation failure of the power module, and electric arc discharge occurs. Otherwise, the failure of the power module at high temperature may cause the battery module to open valve and cause thermal runaway failure, thereby causing the safety failure to spread to the whole battery pack.

Fourth, the battery packs are connected through the opposite plug terminals, if one or more battery packs are out of control, high-temperature smoke and electrolyte generated by the failed battery pack are easy to diffuse to other battery packs, and fault diffusion of the battery packs is easy to occur.

Referring to fig. 3, 4a, 4b and 5, fig. 2 is a schematic structural view of an energy storage device according to some embodiments of the present application, fig. 3 is a schematic view of a battery pack of the energy storage device according to some embodiments of the present application, fig. 4a is an exploded perspective view of the battery pack of fig. 3 according to some embodiments of the present application, fig. 4b is a further exploded perspective view of the battery pack of fig. 3 according to some embodiments of the present application, and fig. 5 is a cross-sectional view along line I-I shown in fig. 3 according to some embodiments of the present application, wherein the battery pack 100 includes a first housing 10, a second housing 20, a battery module 30, a power module 40, a power connection row 50 and a separator 60. The first housing 10 is used for accommodating the power module 40, the second housing 20 is used for accommodating the battery module 30, the first housing 10 is positioned outside the second housing 20, and the first housing 10 and the second housing 20 are arranged in parallel and fixedly connected. The power module 40 is electrically connected to the battery module 30 through the power connection row 50. The power module 40 is used for performing power conversion on the battery module 30. The separator 60 is fixedly coupled to the first housing 10 for separating the power module 40 from the battery module 30.

The power module 40 is accommodated in the first housing 10, and the battery module 30 is accommodated in the second housing 20, that is, the power module 40 and the battery module 30 are arranged in separate cavities, so that the influence of factors such as ambient temperature and the like on the battery module 30 and the power module 40 before being reduced is facilitated, the possibility of condensation formed on the power module 40 is reduced in areas with large ambient temperature difference and high air humidity, the possibility of faults such as short circuit and failure of devices in the power module 40 is reduced, and the safety and reliability of the battery pack 100 are improved.

In some embodiments of the present application, the partition 60 is fixed to and hermetically connected with the first housing 10, the second housing 20 and the partition 60 together enclose the battery compartment 101, the first housing 10 and the partition 60 together enclose the electrical compartment 103, that is, the battery module 30 and the power module 40 are physically separated in space by the partition 60, so that air flow and heat transmission between the battery compartment 101 and the electrical compartment 103 are reduced, and in this way, when the battery module 30 is exposed due to factors such as environment, the possibility of the power module 40 generating condensation is further reduced, thereby reducing the possibility of device short circuit, failure and other faults in the power module 40, and being beneficial to improving the safety and reliability of the battery pack 100. In addition, when the valve opening and thermal runaway of the battery module 30 occur, due to the blocking effect of the partition member 60, the gas circulation between the battery compartment 101 and the electric compartment 103 is reduced, and the possibility of insulation failure and electric arc discharge of the power module 40 caused by smoke and the like of the battery module 30 is reduced.

In addition, the heat generated by part of the devices of the power module 40 during operation is larger, and due to the blocking effect of the separating piece 60, the heat transfer between the battery compartment 101 and the electric compartment 103 is reduced, so that the influence of the heat generated by the power module 40 on the battery module 30 is reduced, the possibility of valve opening and thermal runaway faults of the battery module 30 is also reduced, and the service life of the battery module 30 is prolonged.

In addition, when the power module 40 has the faults of arc discharge, ignition or carbonization, the faults of the power module 40 can not directly affect the battery module 30 due to the action of the partition member 60, so that the safety level of the battery pack 100 can be improved.

Furthermore, among the plurality of battery packs 100, since the battery modules 30 of each battery pack 100 are located in the independent battery compartment 101, when a thermal runaway or other faults occur in the battery module 30 of one battery pack 100, the electrolyte, the smoke and the like of the failed battery module 30 are blocked in the battery compartment 101, so that the possibility that the electrolyte and the smoke of the failed battery module 30 diffuse into other battery packs 100 is reduced, and the safety and the reliability of the energy storage device 150 are improved.

When the battery pack 100 is assembled, the power module 40 may be assembled in the inner cavity of the first housing 10, and then the separator 60 is assembled with the first housing 10. I.e. the power module 40, the first housing 10, the partition 60 may form one electrical module. In the actual production process, after the assembly test of the electric module and the battery module 30 can be completed on the corresponding production line, the electric module and the battery module 30 can be assembled on the final assembly production line by transporting the final assembly production line, so that the assembly time of the electric module and the battery module 30 can be reduced, and the assembly efficiency can be improved. In addition, since the battery module 30 and the electric module are in a modularized design, the number of connecting pieces among the modules is reduced through high integration in the modules, so that the failure probability of parts among the modules can be effectively reduced, and the reliability of the battery pack 100 is improved. In addition, if one of the battery modules 30 or the electric modules in the battery pack 100 malfunctions or needs to be replaced for other reasons, the replacement can be directly and quickly performed, thereby facilitating the manufacture and maintenance of the battery pack 100.

Referring to fig. 6 in combination, fig. 6 is a schematic perspective view of a first housing according to some embodiments of the present application, where an end of the first housing 10 facing the second housing 20 is provided with a first opening 135. The first housing 10 is formed with a first step surface 1351 and a second step surface 1353 around the periphery of the first opening 135. The first step surface 1351 is provided closer to the outside of the first housing 10 than the second step surface 1353. The first step surface 1351 is disposed opposite to and fixedly coupled with the second housing 20. The second step surface 1353 is fixedly coupled to the separator 60. The first step surface 1351 and the second step surface 1353 are disposed on the first casing 10 around the first opening 135, so that the separator 60 can be hidden in the cavity formed by the first casing 10 and the second casing 20, which is beneficial to protecting the separator 60 and reducing the influence of the environment where the battery pack 100 is located on the separator 60.

In the present embodiment, the distance between the first step surface 1351 and the battery module 30 is smaller in the arrangement direction of the first case 10 and the second case 20 than the second step surface 1353, and thus, the space occupied by the separator 60 in the inner cavity of the second case 20 can be prevented or reduced.

Referring to fig. 7 and fig. 8 in combination, fig. 7 is a schematic diagram illustrating a second housing of a battery pack assembled with a battery module according to some embodiments of the present application, and fig. 8 is a schematic perspective view illustrating a second housing of a battery pack according to some embodiments of the present application, wherein an inner cavity of the second housing 20 is configured to accommodate the battery module 30. The end of the second housing 20 facing the first housing 10 is provided with a second opening 21. The second housing 20 is formed with a flange 211 along the periphery of the second opening 21, the flange 211 is protruding towards the inner cavity of the second housing 20, and the flange 211 is used for being fixedly connected with one end of the first housing 10 where the first opening 135 is located. The flange 211 is provided with a plurality of fixing holes 2115 for fixing connection with the first housing 10. A plurality of fixing holes 2115 are provided around the second opening 21. The flange 211 can reduce moisture and the like from entering the inner cavity of the second housing 20. The flange 211 is fixedly connected with the first housing 10, so that the contact area between the second housing 20 and the first housing 10 can be increased, and the connection stability between the second housing 20 and the first housing 10 can be improved. A plurality of fixing members may be protruded on the first step surface 1351, and each fixing member is fixedly inserted into one fixing hole 2115 formed in the second housing 20, thereby fixedly connecting the first housing 10 and the second housing 20. The fixing member may be a stud, and the fixing hole 2115 may be a screw hole. It is understood that a plurality of fixing members may be provided at least one of the first and second cases 10 and 20, and the first and second cases 10 and 20 are fixedly connected by the fixing members. It should be understood that the present application is not limited to the connection manner between the first housing 10 and the second housing 20, for example, the first housing 10 and the second housing 20 may be connected by a snap connection or the like, and the first housing 10 and the second housing 20 may be connected.

Referring to fig. 9, the battery module 30 includes a bracket 31, a plurality of battery cells 33 and conductive connecting pieces 35. The poles of the plurality of cells 33 are fixed to the holder 31. In some embodiments of the present application, the plurality of electric cells 33 are electrically connected by the conductive connection piece 35, the poles of the plurality of electric cells 33 are all located on the same plane, and a part of the conductive connection piece 35 is electrically connected with the other end of the power connection row 50. In some embodiments of the present application, a portion of the conductive connection sheet 35 serves as a positive electrode and a negative electrode of the battery module 30, the positive electrode of the battery module 30 is electrically connected to the power module 40 through the power connection row 50, and the negative electrode of the battery module 30 is electrically connected to the power module 40 through the power connection row 50. It is understood that the conductive connecting piece 35 in the battery module 30 may be omitted, and the positive and negative electrodes of the battery module 30 are electrically connected with the power module 40 through the bus bars.

Referring to fig. 10 and 11 in combination, fig. 10 is an exploded perspective view of a first housing, a power module, and a separator according to some embodiments of the present application, and fig. 11 is an exploded perspective view of the first housing, the power module, and the separator according to some embodiments of the present application, wherein the power module 40 includes a circuit board 41, a power terminal 43, a signal terminal 45, a power conversion module (not shown), and a battery management module BMU (Battery Management Unit) (not shown). The circuit board 41 is accommodated in the electrical bin 103 and fixedly connected to the first housing 10. The power terminal 43, the signal terminal 45, the power conversion module, and the battery management module are all disposed on the circuit board 41. The power terminal 43 is electrically connected to the power conversion module, and the power terminal 43 is electrically connected to the battery module 30 through the power connection row 50. The signal terminal 45 is electrically connected to the battery management module, and the signal terminal 45 is electrically connected to the battery module 30 through the power connection row 50. The power conversion module is used for performing power conversion on the voltage output by the battery module 30, and/or the power conversion module is used for performing power conversion on the voltage output by the external power supply and outputting the power conversion to the battery module 30, the bmu can monitor the operation state of the battery module 30, ensure safe and reliable operation of the battery module 30, intelligently manage and maintain each battery cell 33, monitor and collect the state parameters (including but not limited to the voltage, temperature, current, SOC, SOH, etc. of the battery module 30) of the battery module 30 in real time, perform necessary analysis and calculation on the parameters of the relevant state, obtain more system state evaluation parameters, and realize effective management and control on the battery module 30 according to a specific protection control strategy, thereby ensuring safe and reliable operation of the battery module 30. The power conversion module may be a DC/DC conversion circuit, where the DC/DC conversion circuit is configured to boost a voltage output by the battery module 30 and output the boosted voltage to an external device, and/or the DC/DC conversion circuit is configured to buck a voltage output by an external DC power supply and output the stepped voltage to the battery module 30, so as to charge the battery module 30. Integrating the BMU and the power conversion module within the electrical module effectively reduces the number of wires inside the battery pack 100. Or the power conversion module may be a DC/AC conversion circuit for converting a direct current voltage output from the battery module 30 into an alternating current voltage to be output to an external load or an alternating current power grid, and/or the DC/AC conversion circuit for converting a voltage output from an external alternating current power source into a direct current voltage to be output to the battery module 30, thereby charging the battery module 30.

In some embodiments of the present application, the circuit board 41 includes a first surface 411 (as shown in fig. 11) and a second surface 413 (as shown in fig. 10) disposed opposite to each other in the arrangement direction of the first casing 10 and the second casing 20. The first surface 411 is disposed toward the battery module 30. The power terminals 43 and the signal terminals 45 are protruded from the first surface 411. The circuit board 41 is fixed in the first housing 10, and the partition 60 is fixedly connected with the circuit board 41, so that the partition 60 is fixed with the first housing 10. It is to be understood that the present application is not limited to the connection manner between the partition 60 and the first housing 10, for example, the partition 60 is not connected to the circuit board 41, but the partition 60 may be directly fixed to the second step surface 1353 by means of a screw or the like, or the like.

Referring to fig. 12, fig. 12 is a schematic diagram illustrating an assembly of a circuit board, a power terminal, a spacer and a protective colloid according to some embodiments of the application, in which the power terminal 43 includes a solder leg 431 and a connecting end 433 fixedly connected, and the solder leg 431 is fixedly disposed through the circuit board 41 and exposes the second surface 413 of the circuit board 41. The solder legs 431 of the power terminals 43 are fixed to the circuit board 41 by soldering. The connection end 433 is located at a side of the first surface 411. The connection terminal 433 is used for electrically connecting with the battery module 30, so as to realize power connection between the battery module 30 and the power module 40. The power module 40 further includes a protective colloid 47, where the protective colloid 47 is disposed on the second surface 413, that is, the protective colloid 47 is disposed on a surface of the circuit board 41 facing away from the battery compartment 101, and the protective colloid 47 covers the solder fillets 431 and the second surface 413 of the circuit board 41. The protective colloid 47 serves to protect the fillets 431 to reduce the possibility that the fillets 431 are melted at high temperature in the event of thermal runaway or other extreme conditions of the battery module 30. The protective colloid 47 may be a room temperature vulcanizing (Room Temperature Vulcanizing, RTV) silicone gel. RTV organic silica gel has good electric insulation and arc resistance, ageing resistance, moisture resistance, good bonding performance and good high temperature resistance. It is understood that the material of the protective colloid 47 is not limited in the present application.

If the battery module 30 is thermally out of control, a large amount of heat generated inside the battery module 30 may cause the temperatures of the battery module 30 and the battery compartment 101 to rise above the melting point of the solder. The power connection row 50 is connected between the battery module 30 and the power terminal 43, and the power connection row 50 continuously conducts a part of heat of the battery compartment 101 to the power terminal 43. Since the protective colloid 47 covers the solder fillets 431 and the second surface 413, heat transmitted from the power connection row 50 reaches the protective colloid 47 and the circuit board 41 through the solder fillets 431, so that the heat dissipation area is increased, and the possibility that the solder fillets 431 are melted at high temperature is reduced.

Referring to fig. 13a and 13b, fig. 13a is an exploded perspective view of a battery pack according to an embodiment of the application, and fig. 13b is an exploded perspective view of another view of the battery pack shown in fig. 13a, in some embodiments of the application, the power module 40 further includes a switching row 46, a first end 461 of the switching row 46 is fixed to and electrically connected to the power terminal 43, and a second end 463 of the switching row 46 is connected to an end of the power connection row 50 remote from the battery module 30. The connection between the power terminals 43 and the power connection rows 50 is realized through the switching rows 46, which is beneficial to improving the flexibility of the positions of the power terminals 43 arranged on the power module 40 and improving the flexibility of the layout of the internal devices of the battery pack 100.

In some embodiments of the present application, the adapter row 46 may have a bent structure, for example, the first end 461 and the second end 463 of the adapter row 46 are located on different planes. In one possible implementation, the second end 463 of the adapter row 46, the power connection row 50 and a portion of the conductive connecting pieces 35 are aligned in a direction substantially parallel to the alignment direction of the first housing 10 and the second housing 20, which is advantageous for reducing the pulling of the adapter row 46 on the power connection row 50 and for improving the stability of the electrical connection between the power connection row 50 and the battery module 30 and between the adapter row 46 and the power connection row 50. For example, in the height direction of the battery pack 100 perpendicular to the arrangement direction of the first case 10 and the second case 20, the power terminal 43 may be disposed at one end of the battery pack 100 near the bottom, the conductive connection piece 35 may be disposed at the top of the battery pack 100, the first end 461 of the switching row 46 is connected to the power terminal 43, the second end 463 of the switching row 46 is connected to the power connection row 50, and the switching row 46 can realize a larger span in space, so that electrical connection between the power terminal 43 and the power connection row 50 is realized.

The number of switch rows 46 may be set as desired, and one, or two, or more switch rows 46 may be connected between one power terminal 43 and one power connection row 50. Taking two examples, the first end 461 of the first switch row 46 is fixedly and electrically connected to the power terminal 43, the second end 463 of the first switch row 46 is fixedly and electrically connected to the first end 461 of the second switch row 46, the second end 463 of the second switch row 46 is fixedly and electrically connected to the power connection row 50,

It is understood that the power terminals 43 of the power module 40 may be electrically connected to the battery module 30 through the power connection row 50 without using the adapter row 46, for example, the power terminals 43 are electrically connected to one end of the power connection row 50, and the alignment direction of the power terminals 43, the power connection row 50 and a portion of the conductive connecting pieces 35 is substantially parallel to the alignment direction of the first and second housings 10 and 20, i.e., the positions of the power terminals 43 correspond to the positions of the power connection row 50 away from the end of the battery module 30 and can be directly connected, so that the number of components of the battery pack 100 is simplified because the power terminals 43 are directly connected to the power connection row 50.

Referring to fig. 14a and 14b in combination, fig. 14a is a partially exploded view of a battery pack according to an embodiment of the present application, fig. 14b is a view of another view of the battery pack shown in fig. 14a, a power connection row 50 extends along the arrangement direction of the first housing 10 and the second housing 20, the power connection row 50 includes two ends along the extension direction of the power connection row 50, one end of which is electrically connected to the power terminal 43 of the power module 40, and the other end of which is electrically connected to the conductive connection piece 35 of the battery module 30. By the power connection rows 50 extending in the arrangement direction of the first and second cases 10 and 20, it is advantageous to improve the convenience of the electrical connection between the power module 40 and the battery module 30. The power connection row 50 and the power terminals 43 can be switched by the switching row 46.

Referring to fig. 15, fig. 15 is a schematic perspective view of a power connection row according to some embodiments of the present application, wherein the power connection row 50 includes a flexible bending structure 51, and the bending structure 51 is arranged along an extending direction of the power connection row 50. Referring to fig. 16, fig. 16 is a schematic perspective view illustrating a power connection and a battery module assembled together according to some embodiments of the present application, in which the bracket 31 includes an extension portion 311 extending out of the battery module 30, the extension portion 311 extends along the arrangement direction of the second housing 20 and the first housing 10, the extension portion 311 is provided with a groove 3111, and the groove 3111 is used for accommodating the power connection row 50. Since the bending structure 51 is accommodated in the groove 3111, when the power connection row 50 is stretched or compressed, the power connection row 50 can be deformed along the groove 3111, i.e. the groove 3111 defines the deformation direction of the power connection row 50, which is beneficial to reducing the possibility of changing the relative positions of the power connection row 50 and the conductive connection piece 35, and improving the stability of electrical connection between the power connection row 50 and the battery module 30.

Compared with the traditional non-telescopic plug-in type mounting structure, the power connection row 50 is lower in cost and higher in reliability, and the terminal structure is not easy to damage due to the problems of precision and stress in the assembly process because the power connection row 50 can stretch and deform. The power connection row 50 is provided with a plurality of bending structures 511, the power connection row 50 is made of aluminum, the aluminum has good metal ductility, reliable stretching and compression of the aluminum row can be achieved, and transverse assembly between the battery module 30 and the electric module is achieved. Screw holes may be provided in the power connection bar 50, and the screw holes are matched with screws to fix the power connection bar 50 on the power terminal 43, so as to realize electrical connection between the power connection bar 50 and the power module 40. Specifically, one end of the power connection row 50 may be connected to the adapter row 46 by a bolt, and the other end may be welded to the conductive connection piece 35. The connection using the power connection bank 50 is more reliable than the direct plug connection while supporting a higher power connection. It should be understood that the power connection row 50 may not be an aluminum telescopic structure, for example, the power connection row 50 may be a spiral conductive telescopic structure, the structure of the power connection row 50 is not limited in the present application, and the power connection row 50 may be fixed and electrically connected to the power terminal 43 by plugging or clamping.

Referring to fig. 17, fig. 17 is a schematic perspective assembly diagram of a first housing and a partition according to some embodiments of the present application, wherein the partition 60 is connected to the first housing 10, and the partition 60 covers the first opening 135. In some embodiments of the present application, the partition 60 may be fixedly coupled to the circuit board 41 by a fixing member such as a screw, and the circuit board 41 is fixed to the inner cavity of the first housing 10, thereby fixing the partition 60 to the first housing 10. It is understood that the divider 60 may be integrated on the power module 40, or the divider 60 may be part of the first housing 10.

In the present embodiment, the partition 60 is made of an insulating plastic material, and the electric compartment 103 and the battery compartment 101 are insulated from each other. The separator 60 has a high temperature resistance ranging from 250 to 300 c so that the separator 60 is not melted even in a high temperature environment of 250 to 300 c. The thermal conductivity of the separator 60 is less than 1.0W/mk to provide the separator 60 with a high heat blocking capability, thereby enabling a reduction in heat transfer between the electrical compartment 103 and the battery compartment 101. The bending strength of the partition 60 is more than or equal to 150MPa, so that the partition 60 has higher strength, the partition 60 is not easy to damage when being impacted by external force, and the service life of the partition 60 is prolonged. It should be understood that the material of the separator 60 is not limited to plastics, the separator 60 may be made of other materials, the high temperature resistant range of the separator 60, the thermal conductivity of the separator 60, the bending strength of the separator 60, etc. the separator 60 and the first housing 10 can together form the electrical compartment 103, and the separator 60 and the second housing 20 can form the battery compartment 101.

Referring to fig. 18, fig. 18 is an enlarged schematic view of a partial area II of fig. 5, and the battery pack 100 further includes a first seal 71 and a second seal 73. Referring to fig. 19 in combination, fig. 19 is a schematic perspective view of a first housing according to some embodiments of the present application, and a first groove 1355 disposed around the first opening 135 is formed on the first step surface 1351. The first seal 71 is embedded in the first groove 1355 and is connected to an end of the second housing 20 facing the first housing 10. The first seal 71 is used to achieve a sealed connection between the first case 10 and the second case 20, preventing dust and moisture from entering the inside of the battery pack 100 from between the end face of the first case 10 and the end face of the second case 20. In addition, because the first groove 1355 retains the first seal 71, the likelihood of movement of the first seal 71 relative to the first housing 10 is reduced. Also, due to the presence of the first groove 1355, the first groove 1355 is able to locate the first seal 71 when assembled, facilitating assembly of the first seal 71 between the second housing 20 and the first housing 10.

The second step surface 1353 is provided with a second groove 1357 disposed around the first opening 135. The second sealing member 73 is embedded in the second groove 1357 and is connected to the partition 60. The second seal 73 is used to achieve a sealed connection between the first housing 10 and the partition 60, preventing dust, moisture, etc. from entering the electrical compartment 103 between the second step surface 1353 and the partition 60. Because the second groove 1357 retains the second seal 73, the likelihood of movement of the second seal 73 relative to the first housing 10 is reduced. Due to the presence of the second groove 1357, the second groove 1357 is able to locate the second seal 73 when assembled, facilitating assembly of the second seal 73 between the second housing 20 and the first housing 10.

When assembled, a portion of the first seal 71 is received in the first groove 1355, a portion of the first seal 71 protrudes outside the first groove 1355, a portion of the second seal 73 is received in the second groove 1357, and a portion of the second seal 73 protrudes outside the second groove 1357. When the second housing 20 is fixed to the first step surface 1351, the first seal 71 is pressed by the second housing 20 and the first step surface 1351, the first seal 71 is tightly attached to the first step surface 1351, and the first seal 71 is tightly attached to the first housing 10, so that the first housing 10 is in sealing connection with the second housing 20. When the partition 60 is fixed to the second step surface 1353, the second sealing member 73 is pressed by the partition 60, the second sealing member 73 is tightly fitted to the partition 60, and the second sealing member 73 is tightly fitted to the second step surface 1353, so that the first housing 10 is in sealing connection with the partition 60.

The design of the flange 211 for waterproofing the end face of the second housing 20 facing the electric cabinet 103, the design for waterproofing the first sealing member 71 at the outer edge of the first housing 10 facing the end of the second housing 20, and the screws for matching the outer edge of the first housing 10 facing the end of the second housing 20 realize the mechanical connection of the first housing 10 and the second housing 20 and the sealing and waterproofing of the contact surface.

In some embodiments of the present application, please refer to fig. 20 and 21 in combination, fig. 20 is an assembly schematic diagram of a first housing, a power module, and a separator according to some embodiments of the present application, and fig. 21 is a schematic diagram of a separator according to some embodiments of the present application, wherein the separator 60 includes a first through hole 613 and a second through hole 615 penetrating the separator 60 along an arrangement direction of the electrical bin 103 and the battery bin 101. The first through-hole 613 is provided to pass through the power terminal 43 so that the power terminal 43 can be electrically connected with the battery module 30. The second through-hole 615 is used to pass through the signal terminal 45 so that the signal terminal 45 can be electrically connected with the battery module 30.

The battery pack 100 further includes a third seal 75 and a fourth seal 77. The third seal 75 and the fourth seal 77 may be sealing rings, and the third seal 75 and the fourth seal 77 may be sealing rubber strips or other structures capable of realizing sealing, and the structure and the material of the third seal 75 and the fourth seal 77 are not limited in the present application.

The third seal 75 is similar in arrangement to the fourth seal 77, and fig. 22 of the present application only illustrates how the third seal 75 is disposed between the circuit board 41 and the spacer 60. Referring to fig. 22, fig. 22 is a schematic cross-sectional view of a circuit board, a third sealing member, and a spacer according to some embodiments of the present application, wherein the third sealing member 75 is fixed between the first surface 411 and the spacer 61 of the spacer 60, and the third sealing member 75 is disposed around the first through hole 613. The third seal 75 is fitted around the outer periphery of the power terminal 43.

The third sealing member 75 is fixed between the first surface 411 and the partition 61 of the partition 60 and surrounds the first through hole 613, so that the third sealing member 75, the circuit board 41 and the partition 60 enclose a channel which is spatially isolated from the electrical compartment 103, that is, the third sealing member 75 seals the first through hole 613, so that after the power terminal 43 is electrically connected with the battery module 30, air flow and heat are difficult to circulate between the battery compartment 101 and the electrical compartment 103 through the first through hole 613, and the safety and reliability of the battery pack 100 are further improved.

The fourth seal 77 is secured between the first surface 411 and the partition 60, the fourth seal 77 being disposed around the second through hole 615. The fourth seal 77 is fitted around the outer periphery of the signal terminal 45. The fourth sealing member 77 is fixed between the first surface 411 and the partition member 60 and surrounds the second through hole 615, so that the fourth sealing member 77, the circuit board 41 and the partition member 60 enclose a channel which is spatially separated from the electrical compartment 103, that is, the second through hole 615 is sealed by the fourth sealing member 77, and thus, after the signal terminal 45 is electrically connected with the battery module 30, air flow and heat are difficult to circulate between the battery compartment 101 and the electrical compartment 103 through the second through hole 615, and the safety and reliability of the battery pack 100 are further improved.

In assembly, the third seal 75 and the fourth seal 77 are fixed to the first surface 411 by means of glue bonding or the like, the power terminal 43 is accommodated in the third seal 75, the signal terminal 45 is accommodated in the fourth seal 77, and when the separator 60 and the first housing 10 are fixed together, the third seal 75 is disposed around the first through hole 613, the fourth seal 77 is disposed around the second through hole 615, and both the third seal 75 and the fourth seal 77 are in close contact with the separator 60.

It is to be understood that the power terminal 43 may not be disposed through the first through hole 613, for example, the power connection row 50 may be disposed through the first through hole 613 and/or the third sealing member 75, and the power terminal 43 may be electrically connected to the power connection row 50 through the first through hole 613.

In some embodiments of the present application, referring to fig. 23, fig. 23 is a partially exploded perspective view of a battery pack according to some embodiments of the present application, and the battery pack 100 further includes a sampling line 81. The sampling line 81 is electrically connected to the battery module 30, and the sampling line 81 is electrically connected to the signal terminal 45. It is understood that the signal terminal 45 may not be disposed through the second through hole 615, for example, the sampling line 81 may be disposed through the second through hole 615 and/or the fourth sealing member 77, and the signal terminal 45 may be electrically connected to the sampling line 81 through the second through hole 615.

In some embodiments of the present application, as shown in fig. 24, fig. 24 is a cross-sectional view of a battery pack according to some embodiments of the present application, a separator 60 is a circuit board, a periphery of the separator 60 is fixedly and hermetically connected to an inner wall of the first housing 10, and the power module 40 includes a power device disposed on a side of the separator 60 facing the first housing 10. In the present embodiment, the periphery of the separator 60 is fixed to the first casing 10 by the sealing compound 90 and is hermetically connected to the first casing 10, the separator 60 and the first casing 10 enclose an electrical compartment 103, and the separator 60 and the second casing 20 enclose a battery compartment 101. In other words, the circuit board directly divides the cavity enclosed by the first housing 10 and the second housing 20 into the battery compartment 101 and the electrical compartment 103. The power devices in the power module 40 can be electrically connected with the battery module 30 by threading or the like. The compartment is directly formed by the circuit board, so that the number of components of the battery pack 100 is reduced, and the occupied space of the battery pack 100 is reduced.

In some embodiments of the present application, as shown in fig. 25, fig. 25 is a cross-sectional view of a battery pack according to some embodiments of the present application, the first case 10 and the second case 20 may be arranged in the direction in which the separator 60 is located between the first case 10 and the second case 20, the separator 60 is fixed to and hermetically connected with the first case 10, and the separator 60 is fixed to and hermetically connected with the second case 20.

In some examples, as shown in fig. 26 and 27, fig. 26 is an exploded perspective view of a battery pack according to some embodiments of the present application, and fig. 27 is an exploded perspective view of a battery pack according to some embodiments of the present application, in the arrangement direction of the second housing 20 and the first housing 10, a decorative cover 91 is disposed on one side of the second housing 20 facing away from the first housing 10, and on one side of the first housing 10 facing away from the second housing 20. The decorative cover 91 may be a plastic member, which is advantageous in improving the insulation and aesthetic properties of the battery pack 100.

The battery pack 100 further includes an external connector 83, the external connector 83 being electrically connected with the power conversion module, the external connector 83 being for connection with an external device to input or output electric power.

It is to be understood that the terms such as "comprises" and "comprising," which may be used in this application, indicate the presence of the disclosed functions, operations or elements, and are not limited to one or more additional functions, operations or elements. In the present application, terms such as "comprising" and/or "having" may be construed to mean a particular feature, number, operation, constituent element, component, or combination thereof, but may not be construed to exclude the presence or addition of one or more other features, numbers, operations, constituent elements, components, or combination thereof.

Furthermore, in the present application, the expression "and/or" includes any and all combinations of the words listed in association. For example, the expression "a and/or B" may include a, may include B, or may include both a and B.

In the present application, expressions including ordinal numbers such as "first" and "second" and the like may modify each element. However, such elements are not limited by the above expression. For example, the above description does not limit the order and/or importance of the elements. The above description is only intended to distinguish one element from another element. For example, the first user device and the second user device indicate different user devices, although both the first user device and the second user device are user devices. Similarly, a first element could be termed a second element, and, similarly, a second element could be termed a first element, without departing from the scope of the present application.

When a component is referred to as being "connected" or "connected" to another component, it should be understood that: the component is not only directly connected or connected to other components, but there can also be another component between the component and the other components. On the other hand, where components are referred to as being "directly connected" or "directly accessed" to other components, it should be understood that there are no components between them.

The foregoing is merely illustrative of the present application, and the present application is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. The battery pack is characterized by comprising a first shell, a second shell, a battery module and a power module, wherein the first shell is used for accommodating the power module, the second shell is used for accommodating the battery module, the first shell is positioned outside the second shell, and the first shell and the second shell are arranged in parallel and fixedly connected;

the power module is electrically connected with the battery module through a power connection row, and the power module is used for carrying out power conversion on the battery module.

2. The battery pack according to claim 1, wherein the power connection row extends in an arrangement direction of the first and second cases, the power connection row including both ends in the extension direction of the power connection row, one end of which is electrically connected to the power module and the other end of which is electrically connected to the battery module.

3. The battery pack of claim 2, wherein the power connection rows include telescoping bent structures aligned along the direction of extension of the power connection rows.

4. The battery pack according to claim 3, wherein the battery module comprises a plurality of cells and a bracket, and the poles of the plurality of cells are fixed on the bracket;

The support comprises an extension part which extends out of the battery module, the extension part extends along the arrangement direction of the second shell and the first shell, the extension part is provided with a groove, and the groove is used for accommodating the bending structure of the power connection row.

5. The battery pack of claim 4, wherein the plurality of cells are electrically connected by conductive tabs, the poles of the plurality of cells are all in the same plane, and a portion of the conductive tabs are electrically connected to the other end of the power connection bank.

6. The battery pack according to claim 5, wherein the power module includes a power terminal electrically connected to one end of the power connection row, and an arrangement direction of the power terminal, the power connection row, and a portion of the conductive connecting piece is parallel to an arrangement direction of the first case and the second case.

7. The battery pack of claim 5, wherein the power module comprises a transfer row and a power terminal, the power terminal electrically connected to one end of the transfer row, the other end of the transfer row connected to one end of the power connection row.

8. The battery pack according to claim 7, wherein an arrangement direction of the other end of the transfer row, the power connection row, and a part of the conductive connecting pieces is parallel to an arrangement direction of the first case and the second case.

9. The battery pack according to any one of claims 1 to 8, further comprising a partition member, wherein a first opening is provided in a side of the first housing facing the second housing, the partition member is fixedly and sealingly connected to the first housing, the partition member is located between the power module and the battery module, and the partition member covers the first opening.

10. The battery pack according to claim 9, wherein the first case is provided with a first step surface and a second step surface around the periphery of the first opening, the first step surface and the second step surface being provided around the periphery of the first opening, the first step surface being closer to the second case than the second step surface;

The first step surface is connected with the second housing, and the second step surface is connected with the partition.

11. The battery pack of claim 10, further comprising a first seal, wherein a first groove is formed in the first step surface around the periphery of the first opening, and wherein the first seal is embedded in the first groove.

12. The battery pack of claim 10 or 11, further comprising a second seal, wherein a second groove is provided around the first opening on the second step surface, and wherein the second seal is embedded in the second groove.

13. The battery pack according to claim 11, wherein the second housing is provided with a second opening, a flange protruding toward the inside of the second housing is provided at a periphery of the second opening, the flange is disposed opposite to and fixedly connected with the first step surface, and the first sealing member is disposed between the first step surface and the flange.

14. The battery pack of claim 9, wherein the power module comprises a circuit board and a power terminal provided on the circuit board, the separator is provided with a first through hole, the power terminal is electrically connected with the battery module through the first through hole,

The battery pack further comprises a third sealing member, the third sealing member is sleeved on the periphery of the power terminal, and the third sealing member is fixed between the partition member and the circuit board and surrounds the first through hole.

15. The battery pack of claim 14, wherein the power terminal comprises a soldering leg and a connecting end which are fixedly connected, the soldering leg is fixedly arranged on one surface of the circuit board, which faces away from the second shell, and is exposed out of the circuit board, and the connecting end is positioned on one surface of the circuit board, which faces towards the second shell, and is electrically connected with the battery module;

The power module further comprises a protective colloid, wherein the protective colloid is arranged on one surface, away from the second shell, of the circuit board, and the protective colloid covers the welding leg.

16. The battery pack according to claim 14 or 15, further comprising a fourth sealing member, wherein the power module further comprises a signal terminal, a second through hole is further formed in the partition member, the fourth sealing member is sleeved on the periphery of the signal terminal, and the fourth sealing member is fixed between the partition member and the circuit board and surrounds the second through hole.

17. The battery pack according to claim 9, wherein the partition is a circuit board, a periphery of the partition is fixedly and hermetically connected to the inner wall of the first housing, and the power module includes a power device provided on a side of the partition facing the first housing.

18. An energy storage device comprising a plurality of battery packs according to any one of claims 1-17, a plurality of said battery packs being stacked.