Battery pack and battery system

Abstract

The present application relates to the technical field of batteries. Provided are a battery pack and a battery system, which are used for increasing the energy density of the battery pack. The battery pack comprises a housing, a battery management system, and at least one battery module. The housing has an accommodating cavity therein, and the housing comprises an interface panel having interface ports. The battery module is located in the accommodating cavity. The battery management system comprises a battery management module and a sensing harness; the battery management module is located between the battery module and the interface panel, the battery management module is electrically connected to the battery module, the sensing harness is electrically connected to the battery management module, and the sensing harness is led out to the interface ports. By arranging the battery management module between the interface panel of the housing and the battery module, the space inside the housing is rationally utilized. The interface ports are provided on the interface panel, such that the sensing harness electrically connected to the battery management module can be easily led out to the interface ports, thereby reducing the length of the sensing harness and preventing the sensing harness from affecting the arrangement of the battery module.

Description

Battery pack and battery system

[0001] The present application claims priority to the Chinese patent application No. 202422324153.3, filed on September 20, 2024, and entitled "Battery pack and battery system", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] The present application relates to the technical field of battery, in particular to a battery pack and a battery system. BACKGROUND

[0003] The battery system is a power supply device for electric vehicles, electric trains, new energy heavy trucks and other equipment. Generally, the battery system is composed of one or more battery packs. The battery pack includes a shell, a battery management system and a battery module installed in the shell. The battery module supplies power to the battery pack, and the battery management system is electrically connected to the battery module to detect the state of the battery pack.

[0004] However, the energy density of the battery pack is limited.

[0005] UTILITY MODEL CONTENT

[0006] The present application provides a battery pack and a battery system for maximizing the use of space in the shell and improving the energy density of the battery pack.

[0007] To achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0008] One aspect of the present application provides a battery pack, which includes a shell, a battery management system and at least one battery module.

[0009] The shell has a receiving cavity, and one side of the shell has a terminal block with a terminal port.

[0010] The battery module is located in the receiving cavity.

[0011] The battery management system includes a battery management module and a collection harness. The battery management module is located between the battery module and the terminal block, and the battery management module is electrically connected to the battery module. The collection harness is electrically connected to the battery management module, and the collection harness is led out to the terminal port.

[0012] In one possible implementation, the battery pack includes at least two battery modules. Each battery module is arranged along the length direction of the shell, and any two adjacent battery modules are electrically connected.

[0013] In a possible implementation, the battery pack further includes at least two groups of flexible circuit boards, each group of the flexible circuit boards is arranged at the bottom of a corresponding battery module, any two adjacent groups of the flexible circuit boards are electrically connected through a connector, and the flexible circuit board close to the connector board is electrically connected with the battery management module.

[0014] In a possible implementation, the shell includes a box body and a box cover, and the box body and the box cover are covered with each other to define the accommodating cavity.

[0015] In a possible implementation, the box body includes a bottom plate and first and second side plates oppositely arranged along a first direction, and the box cover includes a top cover plate and third and fourth side plates oppositely arranged along a second direction.

[0016] The bottom plate has first and second long-strip-shaped convex edges oppositely arranged along the second direction, and the third and fourth side plates are connected with the first and second long-strip-shaped convex edges respectively.

[0017] The first side plate has a first annular convex edge extending towards the second side plate, the second side plate has a second annular convex edge extending towards the first side plate, and the two ends of the top cover plate are connected with the first and second annular convex edges respectively.

[0018] In a possible implementation, the angle between the extension direction of the connecting surface of the third side plate and the first long-strip-shaped convex edge and the extension direction of the bottom plate is less than 90 degrees, and the angle between the extension direction of the connecting surface of the fourth side plate and the second long-strip-shaped convex edge and the extension direction of the bottom plate is less than 90 degrees.

[0019] In a possible implementation, the outer surface of the box cover is provided with a plurality of polygonal protrusions.

[0020] In a possible implementation, the battery module is mounted on the bottom plate of the shell.

[0021] In a possible implementation, the battery module is adhered to the bottom plate through a heat-conducting structural adhesive.

[0022] In a possible implementation, the battery module includes a first end plate, a second end plate, a cell assembly, a first pull rod assembly and a second pull rod assembly.

[0023] The cell assembly is clamped between the first end plate and the second end plate.

[0024] The first pull rod assembly is arranged through one end of the first end plate and the second end plate close to the connector board.

[0025] The second pull rod assembly is arranged through one end of the first end plate and the second end plate away from the connector plate.

[0026] Another aspect of the present application provides a battery system, the battery system comprising the battery pack in any of the above aspects;

[0027] The number of the battery packs is one.

[0028] Alternatively, the number of the battery packs is multiple, and the multiple battery packs are combined in series and / or parallel.

[0029] The battery pack and the battery system provided by the present application have the following beneficial effects:

[0030] The battery pack comprises a shell, a battery management system and at least one battery module. The battery module can be installed in the accommodating cavity in the shell. The battery management system comprises a battery management module and an acquisition wire harness. Compared with the related art, the battery pack and the battery system provided by the present application set the battery management module between the connector plate of the shell and the battery module, so that the battery management module utilizes the gap between the connector plate and the battery module and reasonably utilizes the space in the shell. The connector plate has a connector port, so that the acquisition wire harness electrically connected to the battery management module is conveniently led out to the connector port, thereby reducing the length of the acquisition wire harness and avoiding the influence of the acquisition wire harness on the arrangement of the battery module. BRIEF DESCRIPTION OF DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0032] FIG. 1 is a structural schematic diagram of a battery pack provided by an embodiment of the present application;

[0033] FIG. 2 is a structural schematic diagram of a battery pack omitting a box cover provided by an embodiment of the present application;

[0034] FIG. 3 is a structural schematic diagram of a battery module provided by an embodiment of the present application;

[0035] FIG. 4 is a partial cross-sectional schematic diagram of a battery pack provided by an embodiment of the present application.

[0036] Explanation of reference signs: 10 - housing; 11 - connector board; 12 - box body; 121 - bottom plate; 1211 - first long strip-shaped flange; 122 - first side plate; 1221 - first annular flange; 123 - second side plate; 1231 - second annular flange; 13 - box cover; 131 - top cover plate; 132 - third side plate; 133 - fourth side plate; 134 - polygonal protrusion; 20 - battery management system; 30, 30a, 30b - battery module; 31 - first end plate; 32 - second end plate; 33 - battery cell assembly. DETAILED DESCRIPTION

[0037] The battery pack has a technical problem of limited energy density. The reason for this problem is that part of the space in the battery pack housing is occupied by the battery management system and the connecting wires of the battery management system, so that the space for arranging the battery module is limited, thereby causing the energy density of the battery pack to be limited.

[0038] To solve the above technical problem, the application provides a battery pack and a battery system. By arranging the battery management module between the connector board of the housing and the battery module, the battery management module utilizes the gap between the connector board and the battery module, and reasonably utilizes the space in the housing. By having the connector port on the connector board, the collection harness electrically connected to the battery management module is conveniently led out to the connector port, thereby reducing the length of the collection harness and avoiding the influence of the collection harness on the arrangement of the battery module. Thus, part of the space in the housing is not occupied by the battery management system and the connecting wires of the battery management system, thereby improving the energy density of the battery pack.

[0039] In order to make the above-mentioned purposes, features and advantages of the embodiments of the application more obvious and easy to understand, the technical solutions in the embodiments of the application will be clearly and completely described below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, not all the embodiments. Based on the embodiments in the application, all other embodiments obtained by those of ordinary skill in the art without creative labor are within the scope of protection of the application.

[0040] As shown in FIGS. 1 and 2, the application provides a battery pack, which includes a housing 10, a battery management system 20 and at least one battery module 30. The battery management system 20 and the battery module 30 are both installed in the housing 10.

[0041] The shell 10 is used to protect and support the battery management system 20 and the battery module 30 in the shell 10. The material of the shell 10 includes but is not limited to steel, aluminum and other metal materials. The shell 10 has a receiving cavity, which is a receiving space for the battery management system 20 and the battery module 30. One side of the shell 10 has a connector plate 11. Referring to FIGS. 1 and 2, the connector plate 11 can be the left side plate of the shell 10, and the connector plate 11 can be a structural member for connecting the battery pack with the outside. The connector plate 11 has a connector port, which is an interface for connecting the inside and outside of the shell in the battery pack.

[0042] The battery module 30 is a part for power supply in the battery pack. The battery module 30 can include a plurality of battery cells, which can be combined in series, parallel or series-parallel hybrid. The number of battery modules 30 can be one or more. The battery module 30 is located in the receiving cavity, for example, the battery module 30 is installed at the bottom of the shell 10.

[0043] The battery management system 20 is a monitoring and management unit in the battery pack, which includes a battery management module and a collection harness. The battery management module 20 is electrically connected with the battery module 30, so that the battery management module can monitor the voltage, temperature and other signals of the battery module 30. The collection harness is electrically connected with the battery management module, and is led out to the connector port on the connector plate 11, so that the controller or sensor and other devices outside the battery pack can be electrically connected with the battery management system 20 through the collection harness.

[0044] The battery pack provided by the present application sets the battery management module between the connector plate 11 and the battery module 30 of the shell 10, so that the battery management module utilizes the gap between the connector plate 11 and the battery module 30, and reasonably utilizes the space in the shell 10. The connector plate 11 has a connector port, so that the collection harness electrically connected with the battery management module is easily led out to the connector port, thereby reducing the length of the collection harness and avoiding the influence of the collection harness on the arrangement of the battery module. Thus, part of the space in the shell 10 is avoided to be occupied by the battery management system 20 and the collection harness, thereby improving the energy density of the battery pack.

[0045] In some embodiments, the battery pack includes at least two battery modules 30, and the number of battery modules 30 can be two, three or more. For example, referring to FIG. 2, the number of battery modules 30 is two, and the two battery modules 30 are battery module 30a and battery module 30b. The battery module 30a is closer to the connector plate 11 than the battery module 30b, and is spaced apart along the length direction of the shell 10. The length direction of the shell 10 can be perpendicular to the connector plate 11. The battery module 30a and the battery module 30b are electrically connected, for example, two adjacent battery modules 30 are connected in series by wires or connectors.

[0046] In some embodiments, the battery pack further comprises at least two groups of circuit boards, for example, the battery pack comprises two groups, three groups or more groups of circuit boards, each group of circuit boards can comprise at least one circuit board, and the circuit board can be a flexible circuit board.

[0047] The number of groups of circuit boards can match the number of battery modules 30. Referring to FIG. 2, for example, the battery pack comprises battery module 30a and battery module 30b, and the battery pack comprises two groups of circuit boards. The battery module 30a is closer to the terminal block 11 than the battery module 30b. The two groups of circuit boards are respectively arranged at the bottom of the battery module 30a and the battery module 30b to detect the state information of the battery module 30a and the battery module 30b. The state information can be voltage data, temperature data or voltage data and temperature data.

[0048] The circuit board at the bottom of the battery module 30a and the circuit board at the bottom of the battery module 30b are electrically connected through the connector, and the circuit board at the bottom of the battery module 30a is electrically connected with the battery management module. So that the state information of the battery module 30b can be transmitted to the battery management module through the circuit board at the bottom of the battery module 30a, so that the battery management module can detect the state information of the battery module 30. By such arrangement, the space in the shell 10 can be reasonably utilized, so that the components for collecting the state information of the battery module 30 do not affect the arrangement of the battery module.

[0049] In some embodiments, as shown in FIG. 1, the shell 10 comprises a box body 12 and a box cover 13. As shown in FIG. 2, the box body 12 can comprise a bottom plate 121 and first and second side plates 122 and 123 oppositely arranged along a first direction, which can be the length direction of the box body 12. The first side plate 122 can be the same component as the side plate 11, and one of the first and second side plates 122 and 123 is the left side plate of the box body 12, and the other is the right side plate of the box body 12. The first and second side plates 122 and 123 are arranged on the bottom plate 121. For example, as shown in FIG. 2, the right side of the first side plate 122 has a first annular raised edge 1221 protruding to the right, and the left side of the second side plate 123 has a second annular raised edge 1231 protruding to the left.

[0050] The bottom plate 121 has a first and a second long strip-shaped raised edge 1211 oppositely arranged along a second direction, which can be the width direction of the box body 12. For example, as shown in FIG. 2, the front end and the rear end of the bottom plate 121 have a first and a second long strip-shaped raised edge 1211 protruding upward.

[0051] As shown in FIG. 1, the box cover 13 can include a top cover plate 131, a third side plate 132, and a fourth side plate 133. The top cover plate 131 is located between the third side plate 132 and the fourth side plate 133. The third side plate 132 and the fourth side plate 133 are oppositely arranged along the second direction. One of the third side plate 132 and the fourth side plate 133 can be a front cover plate of the box cover 13, and the other can be a rear cover plate of the box cover 13.

[0052] The top cover plate 131 is crimped on the first annular flange 1221 and the second annular flange 1231, for example, the top cover plate 131 is connected to the first annular flange 1221 by screwing, welding, bonding, etc., and the top cover plate 131 is connected to the second annular flange 1231 by screwing, welding, bonding, etc. The third side plate 132 is crimped on the first long strip-shaped flange 1211, for example, the third side plate 132 is connected to the first long strip-shaped flange 1211 by screwing, welding, bonding, etc. The fourth side plate 133 is crimped on the second long strip-shaped flange, for example, the fourth side plate 133 is connected to the second long strip-shaped flange by screwing, welding, bonding, etc. Thus, the box cover 13 and the box body 12 are covered with each other, and a containing cavity is formed in the shell 10. In this way, the box cover 13 and the box body 12 are easy to assemble, and the connection between the box cover 13 and the box body 12 does not limit the arrangement of the battery module 30.

[0053] In some embodiments, as shown in FIG. 4, the angle between the extension direction of the connecting surface of the third side plate 132 and the first long strip-shaped flange 1211 and the extension direction of the bottom plate 121 can be less than 90 degrees, and the angle between the extension direction of the connecting surface of the fourth side plate 133 and the second long strip-shaped flange and the extension direction of the bottom plate 121 can be less than 90 degrees.

[0054] Among them, the angle between the extension direction of the inner side of the connecting surface of the third side plate 132 and the first long strip-shaped flange 1211 and the extension direction of the bottom plate 121 is less than 90 degrees, and the angle between the extension direction of the inner side of the connecting surface of the fourth side plate 133 and the second long strip-shaped flange and the extension direction of the bottom plate 121 is less than 90 degrees.

[0055] It should be noted that the use of acute angles can make the overall structure of the battery pack more compact. Since the acute angle design may allow a tighter fit, it helps to improve the sealing performance of the battery pack, prevent liquid or gas leakage, and protect internal components from environmental influences.

[0056] In some embodiments, as shown in FIG. 1, the outer surface of the box cover 13 is provided with a plurality of polygonal protrusions 134. The polygonal protrusions 134 can be triangular protrusions, rectangular protrusions, pentagonal protrusions, etc. For example, as shown in FIG. 1, the polygonal protrusions 134 include pentagonal protrusions. In this way, the appearance of the battery pack is improved.

[0057] In some embodiments, the battery module 30 is mounted on the bottom plate 121 of the housing 10. For example, the battery module 30 is bonded to the bottom plate 121 so that the battery module 30 is fixed in the housing 10.

[0058] In some embodiments, the battery module 30 is bonded to the bottom plate 121 by a heat-conducting structural adhesive. The heat-conducting structural adhesive has adhesive and heat-conducting properties, which can fix the battery module 30 on the bottom plate 121 and enable the battery module 30 to dissipate heat in a timely manner.

[0059] In some embodiments, as shown in FIG. 3, the battery module 30 includes a first end plate 31, a second end plate 32, a cell assembly 33, a first pull rod assembly, and a second pull rod assembly. The first end plate 31 and the second end plate 32 can be the upper plate and the lower plate of the battery module 30, respectively. The cell assembly 33 can include a plurality of single cells, which can be combined in series or in parallel.

[0060] The cell assembly 33 is clamped between the first end plate 31 and the second end plate 32, so that the first end plate 31 and the second end plate 32 protect the cell assembly 33. The first pull rod assembly is inserted through one end of the first end plate 31 and the second end plate 32 close to the patch panel 11. For example, as shown in FIG. 2, the first pull rod assembly is inserted through the left end. The second pull rod assembly is inserted through one end of the first end plate 31 and the second end plate 32 away from the patch panel 11. For example, as shown in FIG. 2, the second pull rod assembly is inserted through the right end. In this way, the battery module 30 has good mechanical strength.

[0061] The application also provides a battery system, which can be applied in a power consumption device. The power consumption device can include, but is not limited to, a mobile device, an electric vehicle, an electric train, a ship and a satellite, an energy storage system, etc. Specifically, the mobile device can be a mobile charging device, etc.; the electric vehicle can be a pure electric vehicle, a hybrid electric vehicle, a plug-in hybrid electric vehicle, an electric bicycle, an electric scooter, an electric golf cart, an electric truck, an electric heavy truck, or an electric bus, etc., without being limited thereto.

[0062] The battery system includes at least one battery pack. The specific structure of the battery pack and the related effects can refer to the related description of the above embodiments. Since the battery system provided by the application adopts all the technical solutions of any one of the above embodiments, it at least has all the beneficial effects brought by any one of the above embodiments, which will not be repeated here.

[0063] In some embodiments, the battery system includes a plurality of battery packs, and the number of battery packs can be two, three, or more. The battery packs can be combined in series, in parallel, or in a series-parallel hybrid manner. In this way, the battery system can meet the demand for multiple power.

[0064] The embodiments or examples in the specification are described in a progressive manner, and each embodiment focuses on the difference from other embodiments. The same or similar parts between the embodiments can be understood by referring to each other.

[0065] It should be noted that the terms "in some embodiments", "in a specific embodiment", "in this embodiment", "exemplarily" and the like in the specification mean that the described embodiments can include a specific feature, structure or property, but not necessarily every embodiment includes the specific feature, structure or property. In addition, such phrases do not necessarily refer to the same embodiment. In addition, when a specific feature, structure or property is described in combination with an embodiment, it is within the knowledge of those skilled in the art to realize such feature, structure or property in combination with other embodiments that are explicitly or implicitly described.

[0066] Generally, the terms should be understood at least partially by the usage in the context. For example, at least partially according to the context, the term "one or more" used in the specification can be used to describe any feature, structure or property in the singular sense, or can be used to describe a combination of features, structures or properties in the plural sense. Similarly, at least partially according to the context, terms such as "a" or "said" can be understood to convey singular usage or to convey plural usage.

[0067] In addition, the terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features.

[0068] In this application, unless otherwise clearly specified and limited, the terms "mounting", "connection", "connecting", "fixing" and the like should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integral; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0069] It should be easily understood that "on", "above" and "over" in the disclosure should be interpreted in the broadest way, so that "on" not only means "directly on", but also includes the meaning of "on" with intermediate features or layers therebetween, and "above" or "over" not only includes the meaning of "above" or "over", but also can include the meaning of "above" or "over" without intermediate features or layers therebetween (i.e. directly on).

[0070] In addition, spatially relative terms, such as "beneath", "below", "lower", "above", "upper" and the like, can be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. The spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientations depicted in the figures. The devices can be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

[0071] Finally, it should be noted that the above-described embodiments are merely intended for describing and illustrating, not limiting, the technical solutions of the present application; even though the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still make modifications to the technical solutions recorded in the foregoing embodiments, or make equivalent replacements to some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery pack, characterized by, The battery pack comprises a shell (10), a battery management system (20) and at least one battery module (30); The shell (10) has a receiving cavity, and one side of the shell (10) is provided with a connector board (11) having connector ports; The battery module (30) is arranged in the receiving cavity; The battery management system (20) comprises a battery management module and a collection harness, the battery management module is arranged between the battery module (30) and the connector board (11), the battery management module is electrically connected with the battery module (30), and the collection harness is electrically connected with the battery management module and led out to the connector ports.

2. The battery pack of claim 1, wherein, The battery pack comprises at least two battery modules (30), each of which is arranged along the length direction of the shell (10), and any two adjacent battery modules (30) are electrically connected.

3. The battery pack of claim 2, wherein, The battery pack further comprises at least two groups of circuit boards, each group of circuit boards is arranged at the bottom of the corresponding battery module (30), any two adjacent groups of circuit boards are electrically connected through connectors, and the circuit boards close to the connector board (11) are electrically connected with the battery management module.

4. The battery pack of claim 1, wherein, The shell (10) comprises a box body (12) and a box cover (13), and the box body (12) and the box cover (13) are covered with each other to define the receiving cavity.

5. The battery pack of claim 4, wherein, The box body (12) comprises a bottom plate (121), a first side plate (122) and a second side plate (123) oppositely arranged along a first direction, and the box cover (13) comprises a top cover plate (131) and a third side plate (132) and a fourth side plate (133) oppositely arranged along a second direction. The bottom plate (121) is provided with a first long strip-shaped convex edge (1211) and a second long strip-shaped convex edge oppositely arranged along the second direction, and the third side plate (132) and the fourth side plate (133) are connected with the first long strip-shaped convex edge (1211) and the second long strip-shaped convex edge respectively. The first side plate (122) is provided with a first annular convex edge (1221) extending towards the second side plate (123), the second side plate (123) is provided with a second annular convex edge extending towards the first side plate (122), and two ends of the top cover plate (131) are connected with the first annular convex edge (1221) and the second annular convex edge respectively.

6. The battery pack of claim 5, wherein, The angle between the extension direction of the connecting surface of the third side plate (132) and the first long strip-shaped convex edge (1211) and the extension direction of the bottom plate (121) is less than 90 degrees, and the angle between the extension direction of the connecting surface of the fourth side plate (133) and the second long strip-shaped convex edge and the extension direction of the bottom plate (121) is less than 90 degrees.

7. The battery pack of claim 4, wherein, The outer surface of the box cover (13) is provided with a plurality of polygonal protrusions (134).

8. The battery pack of any one of claims 1-7, wherein, The battery module (30) is mounted on the bottom plate of the shell (10).

9. The battery pack of claim 8, wherein, The battery module (30) is adhered to the bottom plate by a heat-conducting structural adhesive.

10. The battery pack of any one of claims 1-7, wherein, The battery module (30) comprises a first end plate (31), a second end plate (32), a cell assembly (33), a first pull rod assembly and a second pull rod assembly; The cell assembly (33) is clamped between the first end plate (31) and the second end plate (32); The first pull rod assembly is arranged through one end of the first end plate (31) and the second end plate (32) close to the junction plate (11); The second pull rod assembly is arranged through one end of the first end plate (31) and the second end plate (32) away from the junction plate (11).

11. A battery system characterized by, The battery pack comprises the battery module as claimed in any one of claims 1-10; The number of the battery pack is one; Alternatively, the number of the battery pack is multiple, and the multiple battery packs are combined in series and / or parallel.

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