Battery module and energy storage device

Abstract

The utility model discloses a battery module and an energy storage device, the battery module comprises a box body, a box cover and a circuit board, and the box body is provided with an opening; the battery cell is accommodated in the box body; the box cover is connected with the box body, and the box cover blocks the opening; one end of the circuit board is connected to the box cover, and the other end of the circuit board extends into the box body. According to the battery module provided by the embodiment of the invention, one end of the circuit board is connected to the box cover, and the other end of the circuit board extends into the box body, namely, the circuit board is mounted on the box cover; and when the box cover is opened, the circuit board can be taken out from the box body, so that the circuit board is convenient to overhaul.

Description

Technical Field

[0001] The present application relates to the technical field of energy storage devices, and in particular to a battery module and an energy storage device. Background Art

[0002] Energy storage devices include household energy storage batteries, power batteries and industrial batteries. The core of energy storage devices is rechargeable batteries, usually based on lithium-ion or lead-acid batteries, which are controlled by computers and have intelligent software to handle charging and discharging cycles. The battery box is the most common energy storage device. The battery box is equipped with battery cells and BMS (Battery Management System) circuit boards. The BMS circuit board is used to monitor battery status, evaluate battery performance, manage battery charging and discharging, and protect the battery.

[0003] In the prior art, when a BMS circuit board in a battery box fails, it is inconvenient to repair. Utility Model Content

[0004] The purpose of this application is to provide a battery module and an energy storage device to solve the problem that the circuit board is inconvenient to repair.

[0005] To achieve the purpose of this application, this application provides the following technical solutions:

[0006] In a first aspect, the present application provides a battery module, comprising:

[0007] A box body, wherein the box body has an opening;

[0008] A box cover, connected to the box body, and the box cover blocks the opening;

[0009] A circuit board, one end of which is connected to the box cover, and the other end of which extends into the box body.

[0010] In one embodiment, the circuit board is perpendicular to the box cover.

[0011] In one embodiment, the battery module further includes a connector, and the connector connects the box cover and the circuit board.

[0012] In one embodiment, the connecting member includes a first support plate and a second support plate connected to each other, the first support plate is arranged parallel to the box cover, the second support plate is arranged parallel to the circuit board, the first support plate is connected to the box cover, and the circuit board is fixed to the second support plate.

[0013] In one embodiment, the battery module further includes a battery cell, which is accommodated in the box body and is electrically connected to the circuit board.

[0014] In one embodiment, a plug is conductively connected to one of the battery cell and the circuit board, and a socket having a slot is conductively connected to the other of the battery cell and the circuit board, and the plug is inserted into the slot.

[0015] In one embodiment, the box body includes a bottom plate and side plates circumferentially arranged around the bottom plate, the socket is arranged on the bottom plate, the plug is arranged on the circuit board, the box cover is connected to the side plates, and the circuit board and the socket are arranged between the battery cell and the side plates.

[0016] In one embodiment, the plug includes a plug housing and an electrical connection portion at least partially extending out of the plug housing, and the electrical connection portion is arranged opposite to the slot.

[0017] In one embodiment, the battery module further includes a first connector, a first mounting portion is provided on the box cover, the first mounting portion is located outside the box body, the first connection is mounted on the first mounting portion, and the first connector is electrically connected to the circuit board.

[0018] In one embodiment, the battery module further includes a second connector, a second mounting portion is provided on the bottom plate, the second mounting portion is located in the box body, the second connector is mounted on the second mounting portion, and the second connector is electrically connected to the battery cell.

[0019] In one embodiment, the battery module further includes a first wire, a second wire and a third wire, a first through hole is provided on the first mounting portion, one end of the first wire passes through the first through hole and is connected to the first connector, the other end of the first wire is connected to the circuit board, one end of the second wire is connected to the second connector, the other end of the second wire is connected to the battery cell, one end of the third wire is connected to the socket, and the other end of the third wire is connected to the battery cell.

[0020] In one embodiment, the battery module further comprises a sealing member, a mounting groove is provided on an end surface of the side plate away from the bottom plate along its circumference, the sealing member is arranged in the mounting groove, and the box cover is in contact with the sealing member.

[0021] In a second aspect, the present application also provides an energy storage device, comprising at least one battery module as described in the first aspect.

[0022] In one embodiment, the energy storage device includes a plurality of the battery modules, each of the battery modules includes a first connector and a second connector, the first connector is provided on the box cover, and the first connector is located outside the box;

[0023] The second connector is arranged in the box body, and a second through hole is arranged at the bottom of each box body, wherein the first connector of one battery module passes through the second through hole of another battery module and is plugged into the second connector.

[0024] The battery module provided in the embodiment of the present application is configured such that one end of the circuit board is connected to the box cover, and the other end of the circuit board extends into the box body, that is, the circuit board is installed on the box cover; when the box cover is opened, the circuit board can be taken out of the box body to facilitate the inspection and maintenance of the circuit board. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0026] Figure 1 A three-dimensional diagram of an energy storage device provided in one embodiment of the present application;

[0027] Figure 2 An exploded diagram of the structure of a battery module provided in one embodiment of the present application;

[0028] Figure 3 A cross-sectional view of a battery module provided in one embodiment of the present application;

[0029] Figure 4 A schematic diagram of a partial structure of a battery module provided in one embodiment of the present application;

[0030] Figure 5 for Figure 4 Exploded diagram of

[0031] Figure 6 A schematic diagram of the structure of a box and a battery cell provided in one embodiment of the present application.

[0032] Description of reference numerals:

[0033] 100, battery module; 110, box body; 111, bottom plate; 111a, second through hole; 111b, second mounting portion; 112, side plate; 112a, mounting groove; 113, fixing seat; 120, battery cell; 121, explosion-proof valve; 130, box cover; 131, first mounting portion; 132, first through hole; 140, circuit board; 151, plug; 151a, plug housing; 151b, electrical connection portion; 152, socket; 152a, slot; 160, connector; 161, first support plate; 162, second support plate; 171, first connector; 172, second connector; 181, first wire; 182, second wire; 183, third wire. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0035] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there can be a central component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there can be a central component at the same time.

[0036] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in this application and in the specification are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in this application includes any and all combinations of one or more of the related listed items.

[0037] In conjunction with the accompanying drawings, some embodiments of the present application are described in detail below. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0038] Energy storage devices include household energy storage batteries, power batteries and industrial batteries. Household energy storage batteries are mainly used in the field of household energy storage. They are energy storage devices that can store electrical energy and regulate electricity consumption. Household energy storage systems can be combined with distributed photovoltaics to power households and store excess electricity and then transmit it to the power grid; household energy storage batteries can be charged when electricity prices are low and discharged when electricity prices are high, reducing electricity costs. At the same time, they can also provide power guarantees during power outages, improving the reliability and economy of household electricity use. Power batteries are mainly used in new energy vehicles and other fields, and are the main energy source for vehicles such as electric vehicles and electric bicycles. Industrial energy storage batteries are mainly used in the industrial field to balance power systems, store renewable energy, and provide backup power.

[0039] The core of energy storage devices is rechargeable batteries, usually based on lithium-ion or lead-acid batteries, which are controlled by computers and have intelligent software to handle the charge and discharge cycles. The battery box is the most common energy storage device. The battery box contains battery cells and BMS (Battery Management System) circuit boards. The battery cells are the core part of the battery box. They are composed of chemical substances and are responsible for storing and releasing energy; the BMS circuit board is the core component of the battery management system, which is responsible for monitoring the battery status, evaluating the battery performance, managing the battery charging and discharging process, and ensuring the safe use of the battery.

[0040] In the prior art, when a BMS circuit board in a battery box fails, it is inconvenient to repair.

[0041] refer to Figure 1 , the present application provides an energy storage device, comprising at least one battery module 100. That is, the energy storage device may include only one battery module 100, or include multiple battery modules 100, without specific limitation. When the energy storage device includes multiple battery modules 100, the connection mode between the battery modules 100 can be selected in series or in parallel. Series connection is to connect the positive electrodes and negative electrodes of multiple battery modules 100 to form a battery string. The series connection can increase the total voltage and energy density of the battery pack, and is suitable for application scenarios with higher voltage requirements. Parallel connection is to connect the positive electrodes and positive electrodes of multiple battery modules 100, and the negative electrodes and negative electrodes to form a battery pack; parallel connection can increase the total capacity and discharge current capacity of the battery pack, and is suitable for application scenarios with higher capacity and power requirements.

[0042] refer to Figure 2 , Figure 3 and Figure 4The present application provides a battery module 100, including a box body 110, a battery cell 120, a box cover 130 and a circuit board 140. The box body 110 has an opening, and the opening of the box body 110 allows the battery cell 120 to be placed in the box body 110; the box cover 130 is connected to the box body 110, and the box cover 130 blocks the opening of the box body 110 to protect the battery cell 120; one end of the circuit board 140 is connected to the box cover 130, and the other end of the circuit board 140 extends into the box body 110, and the circuit board 140 is electrically connected to the battery cell 120. The box body 110 and the box cover 130 can protect the battery cell 120 and the circuit board 140 from damage by the external environment, such as preventing water, dust, vibration, etc. from affecting the battery cell 120 and the circuit board 140; at the same time, the box body 110 and the box cover 130 serve as installation carriers for the battery cell 120 and the circuit board 140, providing stable support for the battery cell 120 and the circuit board 140.

[0043] During the operation of the battery module 100, if the battery cell 120 is over-discharged, short-circuited, or subjected to high temperature, or is subjected to mechanical shock, vibration, electromagnetic interference, etc., the circuit board 140 may be damaged. The battery module 100 provided in the embodiment of the present application cross-connects the circuit board 140 to the box cover 130, so that the circuit board 140 can be taken out of the box body 110 when the box cover 130 is opened, so as to facilitate the inspection and maintenance of the circuit board 140.

[0044] It should be explained that both the box cover 130 and the circuit board 140 are plate-like structures. In the extension direction of the circuit board 140, one end of the circuit board 140 is connected to the box cover 130, and the other end of the circuit board 140 extends into the box body 110. When the box cover 130 is installed on the box body 110, the circuit board 140 is accommodated in the box body 110. The circuit board 140 is connected to the box cover 130 through one end, and there is an angle greater than zero between the circuit board 140 and the box cover 130. The angle between the circuit board 140 and the box cover 130 can range from 80 degrees to 100 degrees. When the box cover 130 is opened, it is convenient to inspect the front and back sides of the circuit board 140. Among them, the circuit board 140 is directly installed on the box cover 130, and the circuit board 140 does not need to be screwed on the box body 110 to fix it, which will not damage the structure of the box body 110 and improve the sealing performance.

[0045] Optionally, the circuit board 140 is perpendicular to the box cover 130, that is, the angle between the circuit board 140 and the box cover 130 is 90 degrees. When the box cover 130 is arranged in the horizontal direction, the circuit board 140 is arranged in the vertical direction, so that the box cover 130 can be separated from the box cover 130 in the vertical direction; and the circuit board 140 arranged in the vertical direction is convenient to be taken out from the box body 110, so as to reduce the space occupied in the box body 110.

[0046] refer to Figure 2 , Figure 4 and Figure 5In the embodiment of the present application, the battery module 100 further includes a connector 160, which includes a first support plate 161 and a second support plate 162 connected to each other. The first support plate 161 is arranged in parallel with the box cover 130, and the second support plate 162 is arranged in parallel with the circuit board 140. The first support plate 161 is connected to the box cover 130, and the circuit board 140 is fixed on the second support plate 162. Specifically, the connector 160 is an integrally arranged sheet metal part, which is easy to manufacture; the angle between the first support plate 161 and the second support plate 162 corresponds to the angle between the box cover 130 and the circuit board 140. The circuit board 140 is connected to the box cover 130 through the connector 160 to realize the longitudinal arrangement of the circuit board 140 and improve the installation stability of the circuit board 140. Among them, rivet studs are set on the second support plate 162, and the circuit board 140 is fixed to the second support plate 162 by cooperating with the rivet studs through screws, bolts, etc.; the first support plate 161 is connected to the box cover 130 through riveting and glue dispensing technology to improve the waterproof performance of the box cover 130.

[0047] Optionally, a thermal pad is provided between the circuit board 140 and the second support plate 162 to fill the gap between the heating element on the circuit board 140 and the second support plate 162, thereby improving the heat dissipation efficiency of the circuit board 140 and providing insulation, shock absorption, and tolerance absorption. The thermal pad may be silica gel, thermally conductive gel, graphite sheet, etc.

[0048] In the embodiment of the present application, a plug 151 is conductively connected to one of the battery cell 120 and the circuit board 140, and a socket 152 having a slot 152a is conductively connected to the other of the battery cell 120 and the circuit board 140, and the plug 151 is plugged into the slot 152a of the socket 152. In practical applications, the plug 151 can be set on the circuit board 140, and the socket 152 can be set on the inner wall of the box 110; or the socket 152 can be set on the circuit board 140, and the plug 151 can be set on the inner wall of the box 110, and there is no specific limitation. The present application connects the circuit board 140 and the battery cell 120 by directly plugging the plug 151 into the slot 152a, so as to facilitate the disassembly and assembly of the circuit board 140.

[0049] In one embodiment, the box body 110 includes a bottom plate 111 and a side plate 112 arranged circumferentially around the bottom plate 111, the socket 152 is arranged on the bottom plate 111, the plug 151 is arranged on the circuit board 140, the box cover 130 is connected to the side plate 112, and the circuit board 140 and the socket 152 are arranged between the battery cell 120 and the side plate 112. In this embodiment, the socket 152 is arranged on the bottom plate 111, and the plug 151 is arranged on the circuit board 140, that is, the circuit board 140 can directly support the plug 151, and the bottom plate 111 can directly support the socket 152, which reduces the number of parts. When the box cover 130 and the circuit board 140 are installed with the box body 110, it is convenient to insert the plug 151 into the slot 152a of the socket 152 to realize the electrical connection between the circuit board 140 and the battery cell 120. And the circuit board 140 and the socket 152 are arranged between the battery cell 120 and the side plate 112 to make full use of the space in the box body 110.

[0050] The battery cell 120 is provided with an explosion-proof valve 121 , which faces the box cover 130 , so that the battery cell 120 can be easily inspected when the box cover 130 is opened.

[0051] Specifically, a fixing seat 113 is provided on the bottom plate 111, and the socket 152 is installed on the fixing seat 113 by bolts, screws, etc., so as to improve the installation stability of the socket 152; and by adjusting the height of the fixing seat 113, the plug 151 of different heights can be adapted to ensure that the plug 151 and the socket 152 are firmly plugged. The plug 151 and the slot 152a are plugged to realize the electrical connection between the circuit board 140 and the battery cell 120. When the battery module 100 is assembled and disassembled, the electrical circuit connection and disconnection are completed only when the box cover 130 is installed or disassembled, so that the safety is high during actual production and rework.

[0052] The box cover 130 is connected to one end of the side plate 112 away from the bottom plate 111 by screws, rivets, etc., and a mounting groove 112a is provided along its circumference on one end surface of the side plate 112 away from the bottom plate 111, and a sealing member is provided in the mounting groove 112a. The box cover 130 is in contact with the sealing member to improve the overall waterproof and dustproof performance of the battery module 100; wherein the sealing member is arranged in an annular shape, and the material of the sealing member can be rubber, silicone, PVC (polyvinyl chloride), etc.

[0053] Optionally, the plug 151 includes a plug housing 151a and an electrical connection portion 151b at least partially extending out of the plug housing 151a, and the electrical connection portion 151b is arranged opposite to the slot 152a. In practical applications, the axis of the electrical connection portion 151b is in the same straight line as the axis of the slot 152a, and when the box cover 130 is connected to the box body 110, the plug 151 and the socket 152 are quickly plugged in. Specifically, the box cover 130, the plug 151, the socket 152 and the bottom plate 111 are arranged in sequence from top to bottom, which is convenient for the overall disassembly and assembly of the battery module 100. Among them, one end of the circuit board 140 is connected to the box cover 130, and the plug 151 is arranged on the end of the circuit board 140 away from the box cover 130. Through the connection between the plug 151 and the socket 152, the circuit board 140 is supported, the seismic resistance of the circuit board 140 is improved, and the reliability is higher.

[0054] In the embodiment of the present application, the battery module 100 also includes a first connector 171 and a second connector 172. A first mounting portion 131 is provided on the box cover 130, and the first mounting portion 131 is located outside the box body 110. The first connector 171 is installed on the first mounting portion 131, and the first connector 171 is electrically connected to the circuit board 140; a second mounting portion 111b is provided on the bottom plate 111, and the second mounting portion 111b is located inside the box body 110. The second connector 172 is installed on the second mounting portion 111b, and the second connector 172 is electrically connected to the battery cell 120. Specifically, the first mounting portion 131 is protruded from the side of the box cover 130 away from the box body 110, and the first connector 171 is installed on the first mounting portion 131, so that the first connector 171 is located outside the box body 110; the second mounting portion 111b is protruded from the side of the bottom plate 111 close to the box cover 130, and the second connector 172 is installed on the second mounting portion 111b, so that the second connector 172 is located inside the box body 110.

[0055] When the energy storage device includes only one battery module 100, the first connector 171 is used to connect to an external circuit. When the energy storage device includes multiple battery modules 100, the first connector 171 in one battery module 100 is used to connect to an external circuit, and the second connector 172 in one battery module 100 is used to connect to the first connector 171 in another battery module 100. Specifically, a first through hole 132 is provided on the first mounting portion 131, and the first connector 171 is connected to the circuit board 140 through a first wire 181. The first through hole 132 is provided for one end of the first wire 181 to pass through to connect to the first connector 171; a second through hole 111a is provided on the bottom plate 111, and the second through hole 111a is provided for the first connector 171 of a battery module 100 to penetrate into the box body 110 and connect to the second connector 172 of another battery module 100, so as to realize the electrical connection between the battery cells 120 in multiple battery modules 100.

[0056] In practical applications, the first connector 171 and the second connector 172 can use quick-plug connectors such as aviation plugs to improve high temperature resistance and wear resistance, and enhance the safety and reliability of the battery module 100. The circuit board 140 and the battery cell 120, the battery module 100 and the external circuit, and multiple battery modules 100 are connected by quick-plug connectors to facilitate the overall assembly of the energy storage device.

[0057] refer to Figure 2 , Figure 3 and Figure 6 , the battery module 100 further includes a second wire 182 and a third wire 183, one end of the second wire 182 is connected to the second connector 172, the other end of the second wire 182 is connected to the battery cell 120, one end of the third wire 183 is connected to the socket 152, and the other end of the third wire 183 is connected to the battery cell 120. In the embodiment of the present application, a first through hole is provided on the box cover 130, so that the first wire 181 passes through the box cover 130 and connects to the second connector 172; the second wire 182 is used to realize the electrical connection between the second connector 172 and the battery cell 120; the third wire 183 is used to realize the electrical connection between the socket 152 and the battery cell 120, so as to form a conductive loop between the battery cell 120 and the circuit board 140. Specifically, the first wire 181 is integrated with the box cover 130 and the circuit board 140, and the second wire 182 and the third wire 183 are both located in the box body 110. When the box cover 130 is disassembled, it is not necessary to install and remove each wire, and the disassembly and assembly are convenient.

[0058] In the description of the embodiments of the present application, it should be noted that the orientation or positional relationship of terms such as "center", "up", "down", "left", "right", "vertical", "horizontal", "inside" and "outside" are based on the orientation or positional relationship described in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0059] What is disclosed above is only a preferred embodiment of the present application, and it certainly cannot be used to limit the scope of rights of the present application. Ordinary technicians in this field can understand that all or part of the processes of implementing the above embodiment and equivalent changes made according to the claims of the present application are still within the scope covered by the present application.

Claims

1. A battery module, characterized in that: include: A box body, wherein the box body has an opening; A box cover, connected to the box body, and the box cover blocks the opening; A circuit board, one end of which is connected to the box cover, and the other end of which extends into the box body.

2. The battery module according to claim 1, characterized in that: The circuit board is perpendicular to the box cover.

3. The battery module according to claim 1, characterized in that: The battery module also includes a connector, which connects the box cover and the circuit board.

4. The battery module according to claim 3, characterized in that: The connecting member includes a first supporting plate and a second supporting plate connected to each other, wherein the first supporting plate is arranged parallel to the box cover, the second supporting plate is arranged parallel to the circuit board, the first supporting plate is connected to the box cover, and the circuit board is fixed to the second supporting plate.

5. The battery module according to claim 1, characterized in that: The battery module further includes a battery cell, which is accommodated in the box and electrically connected to the circuit board.

6. The battery module according to claim 5, characterized in that: A plug is conductively connected to one of the battery core and the circuit board, and a socket with a slot is conductively connected to the other of the battery core and the circuit board, and the plug is inserted into the slot.

7. The battery module according to claim 6, characterized in that: The box body includes a bottom plate and side plates circumferentially arranged around the bottom plate, the socket is arranged on the bottom plate, the plug is arranged on the circuit board, the box cover is connected to the side plates, and the circuit board and the socket are arranged between the battery cell and the side plates.

8. The battery module according to claim 6, characterized in that: The plug comprises a plug housing and an electrical connection portion at least partially extending out of the plug housing, wherein the electrical connection portion is arranged opposite to the slot.

9. The battery module according to claim 7, characterized in that: The battery module also includes a first connector. The box cover is provided with a first mounting portion, the first mounting portion is located outside the box body, the first connector is mounted on the first mounting portion, and the first connector is electrically connected to the circuit board.

10. The battery module according to claim 9, characterized in that: The battery module also includes a second connector. A second mounting portion is provided on the bottom plate. The second mounting portion is located in the box body. The second connector is mounted on the second mounting portion. The second connector is electrically connected to the battery cell.

11. The battery module according to claim 10, characterized in that: The battery module also includes a first wire, a second wire and a third wire. The first mounting portion is provided with a first through hole, one end of the first wire passes through the first through hole and is connected to the first connector, the other end of the first wire is connected to the circuit board, one end of the second wire is connected to the second connector, the other end of the second wire is connected to the battery cell, one end of the third wire is connected to the socket, and the other end of the third wire is connected to the battery cell.

12. The battery module according to claim 7, characterized in that: The battery module further comprises a sealing member. An installation groove is provided on an end surface of the side plate away from the bottom plate along its circumference. The sealing member is arranged in the installation groove, and the box cover contacts the sealing member.

13. An energy storage device, characterized in that: Comprising at least one battery module according to any one of claims 1 to 12.

14. The energy storage device according to claim 13, characterized in that: The energy storage device comprises a plurality of battery modules, each of which comprises a first connector and a second connector, wherein the first connector is disposed on the box cover and the first connector is located outside the box; The second connector is arranged in the box body, and a second through hole is arranged at the bottom of each box body, wherein the first connector of one battery module passes through the second through hole of another battery module and is plugged into the second connector.

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