CN221176548U - Battery pack and energy storage system - Google Patents

Abstract

The utility model provides a battery pack and an energy storage system, relates to the technical field of energy, and aims to solve the problem of poor pressure release effect of the battery pack. The battery pack provided by the utility model comprises a circuit board assembly, a cover plate and a plurality of battery cells; one surface of each cell comprises an explosion-proof valve, a plurality of cells are arranged in parallel, and the directions of one surfaces of the cells are the same; the circuit board assembly is arranged on one side, close to one side, of the plurality of battery cores and comprises a plurality of first through holes, and the plurality of first through holes are in one-to-one correspondence and are in sealing connection with the plurality of explosion-proof valves; the apron sets up in the circuit board assembly one side that deviates from the electric core, and the apron includes a plurality of explosion-proof windows, a plurality of explosion-proof windows and a plurality of first through-hole one-to-one and sealing connection. In the battery pack provided by the utility model, the first through hole and the explosion-proof window can form the pressure release channel, and the eruption in the battery core can flow through the first through hole and be discharged outwards through the explosion-proof window, so that the eruption can be prevented from spreading in the battery pack, and the safety of the battery pack is improved.

Description

Battery pack and energy storage system

Technical Field

The utility model relates to the technical field of energy sources, in particular to a battery pack and an energy storage system.

Background

With the continuous development and wide application of clean energy sources, the battery cells are widely applied to various energy storage devices with different types. In practical applications, a plurality of battery cells may form a battery pack for use. In the battery pack, a plurality of battery cells are electrically connected in series and/or parallel, so that the battery pack has required output current or output voltage. In a single cell, an explosion-proof valve is arranged on the shell of the cell in order to improve the safety of the cell. When the battery core has the defects of thermal runaway and the like, the explosion-proof valve can be broken through by high pressure generated in the battery core, and electrolyte and other eruption substances in the battery core can be discharged outwards from the explosion-proof valve, so that the damage of the battery core caused by the thermal runaway is reduced. However, in the current battery cell, the explosion-proof valve and the tab are usually located on the same side of the battery cell, and when the battery cell is out of control, the explosion-proof valve and the tab are easily sprayed to the vicinity of the tab or the conductive circuit, and the battery pack is easily subjected to defects such as short circuit. In addition, because the battery pack is not provided with a reasonable pressure relief channel, the eruption is easy to spread in the battery pack, so that other normal electric cores are damaged, and the safety of the battery pack is reduced.

Disclosure of utility model

The utility model provides a battery pack and an energy storage system which are good in pressure relief effect and high in safety.

In a first aspect, the present utility model provides a battery pack comprising a circuit board assembly, a cover plate, and a plurality of electrical cells. One side of each electric core comprises an explosion-proof valve, a plurality of electric cores are arranged in parallel, and the directions of one side of each electric core are the same. The circuit board assembly is arranged on one side, close to one side, of the plurality of battery cores, and comprises a plurality of first through holes, wherein the plurality of first through holes and the plurality of explosion-proof valves are in one-to-one correspondence and are in sealing connection. The apron sets up in the circuit board assembly one side that deviates from the electric core, and the apron includes a plurality of explosion-proof windows, a plurality of explosion-proof windows and a plurality of first through-hole one-to-one and sealing connection. The first through hole and the explosion proof window may constitute a pressure relief channel. When the battery core has the defects of thermal runaway and the like, the pressure in the battery core can be increased, and when the pressure in the battery core is larger than the bursting pressure of the explosion-proof valve, the explosion-proof valve can be burst, and the eruption in the battery core can be ejected from the explosion-proof valve and flows into the pressure release channel. In addition, after the explosion-proof valve is sprayed out, the explosion-proof window can be impacted, and under the impact of the explosion-proof valve, the explosion-proof window can be broken, so that the explosion-proof valve can spray out, the explosion-proof valve can prevent the explosion-proof material from spreading in the battery pack, and the safety of the battery pack is improved.

In one example, the battery pack further includes a sealing plate. The sealing plate is connected between the circuit board assembly and the plurality of electric cores, and comprises a plurality of second through holes, and the plurality of first through holes and the plurality of second through holes are in one-to-one correspondence and are in sealing connection. The sealing connection between the circuit board assembly and the battery cell can be realized through the sealing plate. In addition, a second through hole in the sealing plate may connect the first through hole in the circuit board assembly and the explosion-proof valve of the battery cell. The eruption material sprayed from the explosion-proof valve can flow to the first through hole through the second through hole, and finally is sprayed outwards from the explosion-proof window. The explosion-proof valve, the second through hole, the first through hole and the explosion-proof valve are in sealing connection, and a sealed channel can be formed, so that the eruption is prevented from overflowing to an area outside the channel, and the explosion-proof valve has good safety.

In one example, the circuit board assembly includes a recess within which the seal plate is secured. The recess can realize effectual location to the closing plate to guarantee the position accuracy between closing plate and the circuit board subassembly, can promote the effect of sealing connection between closing plate to circuit board subassembly and the electric core.

In one example, the material of the upper cover is any one of modified polyphenylene ether, polyoxymethylene, polyamide and polycarbonate. By adopting the materials, the cover plate has good insulation property and heat insulation property, and the safety of the battery pack can be effectively improved. In addition, in practical application, the cover plate can also be manufactured by adopting a foaming process through the materials, so that the cover plate has lower weight, and the lightweight design of the battery pack is convenient to realize.

In one example, each cell further includes a positive tab and a negative tab, with the circuit board assembly being electrically connected to the positive tab and the negative tab. The circuit board assembly can realize series and/or parallel conductive connection among a plurality of battery cells so as to enable the battery pack to have higher output power.

In one example, the circuit board assembly includes an insulating support and a conductive trace fixedly connected to the insulating support, the first through holes being disposed in the insulating support. The insulating support can promote the integration of circuit board subassembly to have better structural strength. The first through holes are formed in the insulating support, so that convenience in manufacturing the first through holes can be improved.

In one example, the burst pressure of the burst window is less than the burst pressure of the burst valve. The explosion-proof window can be effectively burst by the explosion-proof object after the burst pressure of the explosion-proof window is set to be smaller than the burst pressure of the explosion-proof valve.

In one example, the circuit board assembly and the cover plate are sealingly engaged. Namely, the circuit board assembly is directly sealed and attached to the cover plate, so that sealing connection between the first through hole and the explosion-proof valve is realized, additional sealing elements can be prevented from being arranged between the circuit board assembly and the cover plate, the use quantity of parts is reduced, and convenience of the battery pack in assembly can be improved.

In one example, the battery pack further includes a housing, the cover plate is fixedly connected to the housing, and the housing and the cover plate enclose a receiving cavity for receiving the plurality of battery cells. The shell and the cover plate can play an effective protective role on the battery cell, can prevent the battery cell from being impacted by external force, can also prevent external dust, water vapor and other impurities from eroding the battery cell, and can effectively improve the safety and reliability of the battery pack.

In a second aspect, the present utility model further provides an energy storage system, including a power conversion device and the battery pack, where the power conversion device is electrically connected with a battery cell in the battery pack, and is configured to convert an ac power into a dc power and provide the dc power to the battery cell, or convert the dc power output by the battery cell into an ac power and output the ac power to the outside. By applying the battery pack, the safety of the energy storage system can be effectively improved. When the battery in the battery pack has the adverse conditions such as thermal runaway, the eruption in the battery core can be effectively discharged outwards, so that the eruption is prevented from spreading in the battery pack, and the safety of the battery pack and the energy storage system can be improved.

Drawings

Fig. 1 is a schematic structural diagram of a battery cell according to the present utility model;

Fig. 2 is a schematic perspective view of a battery pack according to an embodiment of the present utility model;

Fig. 3 is an exploded view of a battery pack according to an embodiment of the present utility model;

fig. 4 is a block diagram of an energy storage system according to an embodiment of the present utility model.

Reference numerals:

100-cell; 100 a-top surface; 100 b-bottom side; 100c, 100d, 100e, 100 f-side; 101-positive electrode lugs; 102-negative electrode ear; 103 an explosion-proof valve; 10-battery pack; 11-a housing; 111-a bottom plate; 1111. 1112-interface; 112. 113, 114, 115-side panels; 116-reinforcing ribs; 12-a circuit board assembly; 120-a first through hole; 121-an insulating support; 13-cover plate; 130-explosion-proof window; 14-sealing plate; 140-second through holes.

Detailed Description

In order to make the objects, technical solutions and advantages of the present utility model more apparent, the present utility model will be further described in detail with reference to the accompanying drawings.

In order to facilitate understanding of the battery pack provided by the embodiment of the present utility model, an application scenario thereof will be described below.

The battery pack provided by the embodiment of the utility model can be applied to the scenes of household energy storage, industrial energy storage, data centers, vehicles and the like and is used for storing and releasing electric energy.

In practice, a plurality of cells may be typically included in a battery pack in order to enable the battery pack to store a sufficient amount of electrical energy. The placement of the plurality of cells can be compact, which can improve the internal space utilization and volumetric specific energy density of the battery pack.

As shown in fig. 1, a single cell 100 is taken as an example. In the battery pack, each cell 100 includes a positive tab 101 and a negative tab 102, and the positive tabs 101 and the negative tabs 102 of the multiple cells 100 may be connected in series and/or parallel to provide the battery pack with a desired output current or output voltage. In the single cell 100, in order to improve the safety of the cell 100, the casing of the cell 100 is provided with an explosion-proof valve 103. When the battery cell 100 has the defects of thermal runaway and the like, the explosion-proof valve 103 is broken through by high pressure generated in the battery cell 100, and the electrolyte and other erupted matters in the battery cell 100 can be discharged outwards from the explosion-proof valve 103, so that the adverse effect of the battery cell 100 caused by the thermal runaway is reduced. However, in the conventional battery cell 100, the explosion-proof valve 103, the positive electrode tab 101 and the negative electrode tab 102 are usually located on the same side of the battery cell 100, and when the battery cell 100 is thermally out of control, the explosion is easily emitted to the vicinity of the positive electrode tab 101, the negative electrode tab 102 or the conductive line, and the battery pack is easily short-circuited. In addition, because no reasonable pressure release channel is arranged in the current battery pack, the eruption is easy to spread in the battery pack, so that other normal battery cells 100 are damaged, and the safety of the battery pack is reduced.

Therefore, the battery pack with good pressure relief effect and high safety is provided.

In order to make the objects, technical solutions and advantages of the present utility model more apparent, the present utility model will be described in further detail with reference to the accompanying drawings and specific embodiments.

As shown in fig. 2 and 3, in one example provided by the present utility model, the battery pack 10 may include a housing 11, a circuit board assembly 12, a cover 13, a sealing plate 14, and a plurality of battery cells 100 (5 are shown in fig. 3). The number of the battery cells 100 included in the battery pack 10 may be any number of two or more, and the number of the battery cells 100 is not limited in the present utility model. One face of each cell 100 includes an explosion-proof valve 103, and a plurality of cells 100 are arranged in parallel, and the faces of each cell 100 including the explosion-proof valve 103 are the same. The circuit board assembly 12 is disposed on a side of the plurality of cells 100 adjacent to the one face. Conductive traces in the circuit board assembly 12 are used for conductive connection with the battery cells 100. In addition, the circuit board assembly 12 includes a plurality of first through holes 120, and the plurality of first through holes 120 and the plurality of explosion-proof valves 103 are in one-to-one correspondence and are hermetically connected through second through holes 140 in the sealing plate 14. The cover plate 13 is disposed on a side of the circuit board assembly 12 facing away from the battery cell 100, and the cover plate 13 includes a plurality of explosion-proof windows 130, where the plurality of explosion-proof windows 130 and the plurality of first through holes 120 are in one-to-one correspondence and are in sealing connection. In summary, in the example provided by the present utility model, the second through-hole 140, the first through-hole 120, and the explosion-proof window 130 together constitute a pressure relief channel. When the battery cell 100 has the defects of thermal runaway and the like, the pressure in the battery cell 100 can be increased, and when the pressure in the battery cell 100 is larger than the bursting pressure of the explosion-proof valve 103, the explosion-proof valve 103 can be burst, and the eruption in the battery cell 100 can be ejected from the explosion-proof valve 103 and flow into the pressure release channel. In addition, when the explosion-proof valve 103 ejects the explosion-proof material, the explosion-proof window 130 is impacted, and under the impact of the explosion-proof material, the explosion-proof window 130 is broken, so that the explosion-proof material is ejected outwards from the explosion-proof window 130, and the explosion-proof material is prevented from spreading in the battery pack 10, so that the safety of the battery pack 10 is improved.

In order to facilitate understanding of the technical solution of the present utility model, the structure of the battery cell 100 will be specifically described below.

As shown in fig. 1, in one example provided by the present utility model, the cell 100 has a rectangular block structure in shape, and has a top surface 100a, a bottom surface 100b, a side surface 100c, a side surface 100d, a side surface 100e, and a side surface 100f. The distance between the top surface 100a and the bottom surface 100b is relatively large, and the connection direction of the top surface 100a and the bottom surface 100b may be considered as the height direction of the battery cell 100. The side of the cell 100 that includes the explosion-proof valve 103 may also be referred to as the top side 100a. The top surface 100a has a positive electrode post 101, a negative electrode post 102, and an explosion-proof valve 103. The areas of the side surfaces 100c and 100d are smaller, and the areas of the side surfaces 100e and 100f are larger. The connection direction of the side 100c and the side 100d may be referred to as the longitudinal direction of the battery cell 100. The connection direction of the side 100e and the side 100f can be regarded as the width direction of the cell 100.

The explosion-proof valve 103 may be a metal or nonmetal membrane, or may be other structural members with pressure relief function. In practical applications, the explosion-proof valve 103 may be of a type that is commonly used at present, and the present utility model is not limited to the specific type of the explosion-proof valve 103. In addition, the positive electrode column 101 and the negative electrode column 102 may be of a type commonly used at present, and will not be described herein.

Alternatively, it is understood that in practical applications, the cell 100 may have a rectangular block structure as shown in fig. 1, or may have a cylindrical structure. In practical applications, the battery pack 10 may select an appropriate battery cell 100 according to practical requirements, and the present utility model is not limited to the specific type and shape of the battery cell 100.

In order to facilitate understanding of the technical solution of the present utility model, in the following examples, the battery cell 100 shown in fig. 1 will be exemplified.

As shown in fig. 3, when the battery cells 100 in the battery pack 10 are specifically laid out, the plurality of battery cells 100 may be sequentially arranged in the width direction of the battery cells 100. The sides (such as the side 100e or the side 100 f) with larger areas between the two adjacent cells 100 are attached to each other, so that the two adjacent cells 100 have larger contact areas. When extrusion acting force exists between two adjacent battery cells 100, the deformation of the two adjacent battery cells 100 can be effectively prevented, and the structural strength and the safety of the battery cells are guaranteed.

When the battery cells 100 are set, two adjacent battery cells 100 may be abutted, or a smaller gap may be reserved. Or a heat insulating plate or other structure may be disposed between two adjacent cells 100. During practical application, the relative relation between two adjacent battery cells 100 can be reasonably adjusted according to practical requirements.

Of course, in other examples, the plurality of battery cells 100 may be arranged in sequence along the length direction of the battery cells 100. In addition, in the above example, only one row of the battery cells 100 is shown. However, in practice, two, three or more rows of cells 100 may be included in the battery pack. In practical application, the number and specific arrangement direction of the battery cells 100 can be reasonably set according to practical requirements, which is not described herein.

In practical use, the constituent elements of the battery pack 10 and the structural shape and type of each constituent element may be varied.

For example, as shown in fig. 2 and 3, in the example provided by the present utility model, the housing 11 includes a bottom plate 111, a side plate 112, a side plate 113, a side plate 114, and a side plate 115. The side plate 112, the side plate 113, the side plate 114 and the side plate 115 are connected in order, and the bottom plate 111 is fixed to one ends of the side plate 112, the side plate 113, the side plate 114 and the side plate 115. Namely, the bottom plate 111, the side plate 112, the side plate 113, the side plate 114 and the side plate 115 together enclose a containing space for containing the plurality of battery cells 100, so that the plurality of battery cells 100 can be effectively fixed and protected. When the battery pack 10 is subjected to external force, the bottom plate 111, the side plates 112, the side plates 113, the side plates 114 and the side plates 115 can effectively protect the battery cells 100. In addition, the bottom plate 111, the side plate 112, the side plate 113, the side plate 114 and the side plate 115 can also form effective isolation for external moisture, dust and other impurities, and the safety and the service life of the battery cell 100 can be ensured. Of course, the upper cover can also play the role of the protection of the battery cell 100, and the upper cover will be specifically described below, which is not repeated here.

In practice, the bottom plate 111 may be a structural member having a relatively high rigidity, such as a metal plate. Alternatively, the bottom plate 111 may be a structural member having a temperature control function.

For example, as shown in fig. 2 and 3, in the example provided by the present utility model, the bottom plate 111 is embodied as a cold plate. Specifically, the bottom plate 111 has a passage for the cooling medium to flow through, and the outer surface of the bottom plate 111 has two ports, i.e., a port 1111 and a port 1112. The ports 1111 and 1112 are connected to an external pipe, and a cooling medium in the pipe may flow from the port 1111 into the bottom plate 111 and be discharged from the port 1112. It will be appreciated that in practice, the port 1111 may be an inlet for the flow of cooling medium into the base plate 111 and the port 1112 may be an outlet for the discharge of cooling medium. Alternatively, the port 1111 may be an outlet for the cooling medium to flow into the bottom plate 111, and the port 1112 may be an inlet for the cooling medium to drain, as the utility model is not limited in this respect.

The bottom surface of each cell 100 may be in contact with the bottom plate 111 such that the cold plate can cool or heat each cell 100, thereby allowing each cell 100 to operate within a reasonable temperature range. Namely, the working performance and the safety of the battery cell 100 can be effectively ensured through the cold plate.

The side plates 112, 113, 114, and 115 may be metal plates having superior rigidity. Two adjacent side plates can be fixedly connected through connecting pieces such as screws, rivets and the like. Or two adjacent side plates can be fixedly connected by welding, bonding and the like. The specific connection manner between the side plates is not limited in the present utility model.

In addition, in the example provided by the present utility model, the housing 11 also has a plurality of reinforcing ribs 116. One end of each stiffener 116 may be fixedly coupled to side plate 112 and the other end may be fixedly coupled to side plate 114. The strength of the connection between the side plates 112 and 114 can be effectively enhanced by the reinforcing ribs 116. When the battery pack 10 is subjected to a large external force, the case 11 is prevented from being deformed or broken. In addition, when the battery cell 100 is deformed in an expansive manner due to thermal runaway, the reinforcing ribs can also prevent the battery cell 100 from being obviously swelled, and the structural safety of the battery pack 10 can be improved.

In practical application, the side plates 112, 113, 114, and 115 may be structural members such as metal plates, or structural members such as cold plates having a temperature control function, and will not be described here.

The specific type of construction of the circuit board assembly 12 may also vary in practice.

For example, as shown in FIG. 3, in one example provided by the present utility model, the circuit board assembly 12 is embodied as an integrated busbar (cells contact system, CCS). The integrated busbar is mainly formed by connecting a conductive circuit and an insulating bracket 121 into a whole through a hot pressing or riveting process and the like. The conductive line may include a signal acquisition component, a copper bar, or an aluminum bar. The copper or aluminum bars may be connected with the positive and negative electrode posts 101 and 102 of the plurality of cells 100 in the battery pack 10, enabling a series connection and/or a series connection between the plurality of cells 100. The signal acquisition assembly can effectively detect parameters such as temperature and voltage of each cell 100. The insulating support 121 is used for fixedly connecting the signal acquisition assembly, the copper bar or the aluminum bar and other assemblies, so that the integrated busbar forms an integral structure.

In practical application, the first through holes 120 in the circuit board assembly 12 may be disposed in the insulating support 121, and the first through holes 120 penetrate through the thickness of the insulating support 121. In a specific arrangement, the number of the first through holes 120 is the same as the number of the battery cells 100, and the first through holes 120 and the explosion-proof valves 103 of the battery cells 100 are arranged in one-to-one correspondence.

It should be noted that, in the implementation, the circuit board assembly 12 may be of other types of structures other than an integrated busbar. In application, the number and types of components included in the circuit board assembly 12 may be reasonably selected and set according to actual requirements, which are not described herein.

With respect to the seal plate 14, in the example provided by the present utility model, the seal plate 14 primarily functions to sealingly connect the first through-hole 120 and the explosion-proof valve 103, preventing leakage of the spray between the electrical core 100 and the circuit board assembly 12.

In particular, in the example provided by the present utility model, the seal plate 14 may be made of a material that is resistant to high temperatures, chemical corrosion and electrical insulation. The seal plate 14 is positioned between the circuit board assembly 12 and the battery cell 100 and is capable of sealingly connecting the circuit board assembly 12 and the battery cell 100. In addition, the sealing plate 14 includes a plurality of second through holes 140. Wherein the number of the first through holes 120, the second through holes 140 and the explosion proof valves 103 is the same, and the first through holes 120, the second through holes 140 and the explosion proof valves 103 are in one-to-one correspondence. The second through-hole 140 can function to connect the first through-hole 120 and the explosion-proof valve 103. The spray ejected from the explosion proof valve 103 may be discharged from the second through hole 140 toward the first through hole 120.

In the example provided by the present utility model, the sealing plate 14 is an elongated plate body, and a groove (not shown) is formed on a side of the insulating support 121 in the circuit board assembly 12 facing the battery cell 100. Wherein the thickness of the sealing plate 14 and the depth of the groove may be substantially the same. The sealing plate 14 is located in the groove, so that sealing connection between the insulating support 121 and each cell 100 can be realized, connection between the plurality of first through holes 120 and the explosion-proof valve 103 can be realized simultaneously, good manufacturing convenience is achieved, and convenience in assembly can be improved.

It will be appreciated that in other examples, the seal plate 14 may be constructed of multiple components. For example, each component of the seal plate 14 may include a second through hole 140. Or in other examples, the sealing plate 14 may be omitted, and the circuit board assembly 12 and the battery cell 100 may be connected in a sealing manner by using structural members such as glue or a sealing ring, which will not be described herein.

As for the cover plate 13, as shown in fig. 2 and 3, in one example provided by the present utility model. The cover plate 13 has a rectangular plate-like structure, and the cover plate 13 includes a plurality of explosion-proof windows 130. Wherein the number of the explosion proof windows 130, the first through holes 120, the second through holes 140, and the explosion proof valves 103 is the same, and the explosion proof windows 130, the first through holes 120, the second through holes 140, and the explosion proof valves 103 are in one-to-one correspondence. The side of the cover plate 13 facing the circuit board assembly 12 is in sealing fit with the insulating support 121, so that sealing connection between the explosion-proof window 130 and the first through hole 120 is realized. In practical application, the cover plate 13 may be made of modified polyphenylene oxide, polyoxymethylene, polyamide, polycarbonate and other materials through a foaming process, so that the cover plate 13 has the characteristic of light weight. In addition, the cover plate 13 has certain flexibility or elasticity, so that the cover plate 13 can be in sealing fit with the insulating support 121 through the flexibility or elasticity of the cover plate. Of course, in other examples, the cover 13 and the insulating support 121 may be connected in a sealing manner by a structural member such as glue or a sealing ring, which is not described herein.

The explosion-proof window 130 has a similar function to the explosion-proof valve 103 in the cell 100. Namely, the explosion-proof window 130 and the explosion-proof valve 103 are in a closed state in a normal state, and when the explosion-proof window 130 and the explosion-proof valve 103 are subjected to a large impact force, the explosion-proof window 130 and the explosion-proof valve 103 can be broken, so that the aim of pressure relief is fulfilled.

In the example provided by the present utility model, the burst pressure of the explosion proof window 130 is smaller than the burst pressure of the explosion proof valve 103, i.e., the explosion proof window 130 is more easily burst than the explosion proof valve 103, thereby improving the safety of the battery pack 10. Specifically, when the burst in the battery cell 100 breaks the explosion-proof valve 103 and is ejected outward, the pressure of the burst may be reduced, and thus, when the breaking pressure of the explosion-proof window 130 is smaller than the breaking pressure of the explosion-proof valve 103, the burst ejected from the explosion-proof valve 103 breaks the explosion-proof window 130 more easily and is ejected outward. In the specific setting, the specific burst pressure of the explosion-proof window 130 and the explosion-proof valve 103 may be set reasonably according to the actual situation, which is not described herein.

The type of structure of the explosion proof window 130 may be various in setting the explosion proof window 130.

For example, as shown in fig. 2 and 3, in one example provided by the present utility model, the explosion proof window 130 is specifically a region of relatively small thickness in the cover plate 13. The structural strength of the region of smaller thickness is lower in the entire cover plate 13, and thus, is more likely to be broken in the region of smaller thickness. By this structural arrangement, the cover plate 13 is made to have a good integrity. When the cover plate 13 is manufactured, the cover plate 13 can be molded by adopting a foaming process, and the explosion-proof window 130 structure is molded at the same time, so that the manufacturing convenience is good. In addition, the explosion-proof window 130 is a closed structure, so that the whole cover plate 13 has better tightness, and the performances of water resistance, dust resistance and the like of the whole battery pack 10 can be ensured.

It will be appreciated that in other examples, the vent 130 in the cover 13 may be a separate diaphragm or the like. In practical application, the specific structure type of the explosion-proof window 130 may be set reasonably according to practical situations, which is not described herein.

In addition, the cover plate 13, the circuit board assembly 12 and the sealing plate 14 may be integrally provided in a specific arrangement. For example, bonding or the like may be used to achieve a secure connection between the cover plate 13, the circuit board assembly 12 and the sealing plate 14. Or the cover plate 13, the circuit board assembly 12 and the sealing plate 14 can be fixedly connected through connecting pieces such as screws, rivets and buckles, so that the integration level of the battery pack 10 is improved, and the convenience in assembling the battery pack 10 is improved.

In the battery pack 10, the case 11 and the lid 13 may be fixedly connected to each other by means of adhesion or the like, or the lid 13 and the case 11 may be fixedly connected to each other by means of a connector such as a screw rivet or a snap. The housing 11 and the cover 13 may enclose a receiving cavity for receiving the battery cell 100, the circuit board assembly 12 and the sealing plate 14, so that the entire battery pack 10 has good sealability.

In practical applications, the cover 13 and the housing 11 can be fixedly connected in a reasonable manner, which is not limited by the present utility model.

Of course, in other examples, components such as a battery management system may also be included in the battery pack 10. The battery management system can be in signal connection with the circuit board assembly 12, and can effectively detect parameters such as the temperature, the state of charge and the health state of the battery cell 100, and can effectively regulate and control the charge and discharge functions of the battery cell 100, so that the normal operation of the battery pack 10 is ensured.

In practical applications, the battery pack 10 may be used in home energy storage, industrial energy storage, data center, vehicles, etc. for storing and releasing electrical energy.

For example, as shown in fig. 4, an embodiment of the present utility model further provides an energy storage system, which may include a power conversion device and a battery pack. The power conversion equipment is electrically connected with the electric core in the battery pack and is used for converting alternating current into direct current and providing the direct current for the electric core, or converting the direct current output by the electric core into alternating current and outputting the alternating current outwards.

In various embodiments of the utility model, where no special description or logic conflict exists, terms and/or descriptions between the various embodiments are consistent and may reference each other, and features of the various embodiments may be combined to form new embodiments based on their inherent logic.

In the present utility model, "a plurality of" means two or more. "and/or", describes an association relationship of an association object, and indicates that there may be three relationships, for example, a and/or B, and may indicate: a alone, a and B together, and B alone, wherein a, B may be singular or plural.

It will be appreciated that the various numerical numbers referred to in the embodiments of the present utility model are merely for ease of description and are not intended to limit the scope of the embodiments of the present utility model. The sequence number of each process does not mean the sequence of the execution sequence, and the execution sequence of each process should be determined according to the function and the internal logic.

Claims (10)

1. The battery pack is characterized by comprising a circuit board assembly, a cover plate and a plurality of electric cores;

One surface of each electric core comprises an explosion-proof valve, a plurality of electric cores are arranged in parallel, and the directions of the surfaces of the electric cores are the same;

The circuit board assembly is arranged on one side, close to one face, of the plurality of electric cores and comprises a plurality of first through holes, and the plurality of first through holes are in one-to-one correspondence with the plurality of explosion-proof valves and are in sealing connection;

the cover plate is arranged on one side, deviating from the battery cell, of the circuit board assembly and comprises a plurality of explosion-proof windows, and the explosion-proof windows and the first through holes are in one-to-one correspondence and are in sealing connection.

2. The battery pack of claim 1, wherein the battery pack further comprises a sealing plate;

The sealing plate is connected between the circuit board assembly and the battery cells, and comprises a plurality of second through holes, and the first through holes and the second through holes are in one-to-one correspondence and are in sealing connection.

3. The battery pack of claim 2, wherein the circuit board assembly includes a recess, the sealing plate being secured within the recess.

4. The battery pack according to any one of claims 1 to 3, wherein the cover plate is made of any one of modified polyphenylene ether, polyoxymethylene, polyamide, and polycarbonate.

5. The battery pack of any one of claims 1 to 4, wherein each cell further comprises a positive tab and a negative tab, the circuit board assembly being electrically connected to the positive tab and the negative tab.

6. The battery pack of any one of claims 1 to 5, wherein the circuit board assembly comprises an insulating bracket and a conductive trace fixedly connected to the insulating bracket;

The first through holes are all arranged in the insulating support.

7. The battery pack of any one of claims 1 to 6, wherein the burst pressure of the burst window is less than the burst pressure of the burst valve.

8. The battery pack of any one of claims 1 to 7, wherein the circuit board assembly and the cover plate are in sealing engagement.

9. The battery pack of any one of claims 1 to 8, further comprising a housing, the cover plate being fixedly connected to the housing, the housing and the cover plate enclosing a receiving cavity for receiving a plurality of the cells.

10. An energy storage system comprising a power conversion device and a battery pack according to any one of claims 1 to 9, wherein the power conversion device is electrically connected to a cell in the battery pack and is used for converting alternating current into direct current and then providing the direct current to the cell, or converting direct current output by the cell into alternating current.