Protection plate, lithium battery module and lithium battery

Abstract

The utility model discloses a protection plate, a lithium battery module and a lithium battery, and belongs to the technical field of lithium batteries, a circuit on the protection plate comprises a main loop, the main loop comprises a main section connected with a plurality of battery cells in series, and the main loop is provided with a positive electrode port and a negative electrode port; a branch circuit configured as a parallel circuit of the main section; the first MOS tube is arranged on the main section; the second MOS tube is arranged on the branch loop; and the control module is connected to the first MOS tube and the second MOS tube, and is configured to realize the on-off and switching of the main loop and the branch loop by controlling the actions of the first MOS tube and the second MOS tube. By arranging the control module in the circuit in the protection board, the on-off control of the main loop and the branch loop and the switching between the main loop and the branch loop can be realized by controlling the actions of the first MOS tube and the second MOS tube, and the embedding and separation of the battery cell in the whole electric loop are realized, so that the purposes of stepless series connection and differential combination between modules are achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of lithium batteries, and particularly relates to a protection board, a lithium battery module and a lithium battery. Background Technique

[0002] However, in existing battery systems using lithium batteries, multiple numbers cannot be connected in series, or an integrated PACK solution is adopted. Although this solution brings convenience to the OEM and customers in terms of appearance, quantity, etc., it requires corresponding changes to the battery assembly scheme, which hinders the popularization of lithium batteries. Summary of the Utility Model

[0003] The purpose of the utility model is to provide a name to solve the problem that existing lithium batteries are difficult to apply in light vehicles as mentioned in the above background technique.

[0004] To achieve the above purpose, the utility model provides the following technical solution: A protection board, on which a circuit is arranged, and the circuit includes:

[0005] A main circuit, which includes a main section in which multiple battery cells are connected in series, and has a positive terminal port and a negative terminal port;

[0006] A branch circuit, which is configured as a parallel circuit of the main section;

[0007] A first MOS transistor, arranged on the main section;

[0008] A second MOS transistor, arranged on the branch circuit;

[0009] A control module, connected to the first MOS transistor and the second MOS transistor, and configured to control the actions of the first MOS transistor and the second MOS transistor to realize the on-off and switching of the main circuit and the branch circuit.

[0010] By arranging a control module in the circuit of the protection board, the on-off control of the main circuit and the branch circuit and the switching between the main circuit and the branch circuit can be realized by controlling the actions of the first MOS transistor and the second MOS transistor, so as to realize the insertion and extraction of the battery cells in the entire electrical circuit, thereby achieving the purpose of stepless series connection and differential combination between modules.

[0011] Preferably, an AFE chip is connected to the multiple chips and the control module, and is configured to collect voltage and temperature data of the battery cells, and the control module is configured to automatically control the actions of the first MOS transistor and the second MOS transistor based on the collected data of the AFE chip to realize the automatic on-off and switching of the main circuit and the branch circuit.

[0012] Preferably, a fuse is arranged on the main section.

[0013] Preferably, a current detection module is provided on the main circuit, and the current detection module is connected to the AFE chip.

[0014] Through the arrangement of the AFE chip, the fuse and the current detection module, when the current in the circuit exceeds the preset value, or the temperature or voltage of the battery cell exceeds the set threshold, the control module can automatically control the actions of the first MOS transistor and the second MOS transistor to realize the switching between the main circuit and the branch circuit, thus protecting the battery cell.

[0015] Preferably, the first MOS transistor is an NMOS transistor and the second MOS transistor is a PMOS transistor.

[0016] On the other hand, the present application discloses a lithium battery module, which is characterized in that it includes a housing, an integrated cover plate, a protection board, a top cover and a plurality of battery cells. A plurality of grooves for accommodating the battery cells are provided in the housing. The integrated cover plate, the protection board and the top cover are assembled at the open end of the housing. A circuit is provided on the protection board, and the circuit includes:

[0017] A main circuit, including a main section, on which the plurality of battery cells are connected in series, and the main circuit has a positive terminal and a negative terminal;

[0018] A branch circuit, which is configured as a parallel circuit of the main section;

[0019] A first MOS transistor, provided on the main section;

[0020] A second MOS transistor, provided on the branch circuit;

[0021] A control module, connected to the first MOS transistor and the second MOS transistor, and configured to control the actions of the first MOS transistor and the second MOS transistor to realize the on / off and switching of the main circuit and the branch circuit.

[0022] Preferably, the circuit further includes:

[0023] An AFE chip, connected to the plurality of chips and the control module, and configured to collect the voltage and temperature data of the battery cells. The control module is configured to automatically control the actions of the first MOS transistor and the second MOS transistor based on the collected data of the AFE chip to realize the automatic on / off and switching of the main circuit and the branch circuit.

[0024] Preferably, the integrated cover plate is provided with electrode plates in contact with the battery cells, the protection board is integrated with electrode posts, and the top cover is provided with an opening at the corresponding position of the electrode posts.

[0025] Preferably, the number of the battery cells is a positive integer multiple of 4.

[0026] On the other hand, the present application discloses a lithium battery, which is formed by connecting a plurality of the above-mentioned lithium battery modules in series. Description of the Drawings

[0027] Figure 1 It is an assembly drawing of a lithium battery module;

[0028] Figure 2 It is a schematic diagram of the disassembly of the lithium battery module;

[0029] Figure 3 It is a circuit diagram of the protection board;

[0030] Figure 4 It is a schematic diagram of the assembly of the lithium battery.

[0031] In the figure:

[0032] 100, housing; 101, battery cell; 102, integrated cover plate; 103, protection board; 104, top cover;

[0033] 200, main circuit; 200a, main section; 201, branch circuit; 203, first MOS transistor; 204, second MOS transistor; 205, control module; 206, AFE chip; 207, current detection module;

[0034] 300, vehicle frame; 301, battery compartment; 302, installation pressing strip; 303, wiring harness. Detailed Implementation Manner

[0035] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0036] A lithium battery module, referring to Figure 1 and 2 , the main body is composed of a housing 100, an integrated cover plate 102, a protection board 103, a top cover 104 and a plurality of battery cells 101. Among them, the number of battery cells 101 is 4 or a multiple of 4, and they are configured as lithium iron phosphate battery cells 101. Further, a groove for accommodating the battery cells 101 is formed in the housing 100, and the integrated cover plate 102, the protection board 103 and the top cover 104 are assembled at the open end of the housing 100 to close the open end of the housing 100 to form a closed lithium battery module structure. In some embodiments, the above-mentioned integrated cover plate 102 has a pole piece in contact with the battery cell 101, the protection board 103 is integrated with a pole column, and the above-mentioned top cover 104 is provided with an opening at the corresponding position of the pole column and serves as the output and connection port of the lithium battery module.

[0037] Referring to Figure 3, A circuit is also provided on the above protection board 103. The circuit has a main circuit 200 and a branch circuit 201. The main circuit 200 includes a main section 200a in which a plurality of battery cells 101 are connected in series, and has a positive port and a negative port. The branch circuit 201 is configured as a parallel circuit of the main section 200a in the main circuit 200, that is, the branch circuit 201 and the main circuit 200 share the same positive port and negative port.

[0038] Referring to Figure 3 , the above circuit also has a first MOS transistor 203 arranged on the main section 200a in the main circuit 200 and a second MOS transistor 204 arranged on the branch circuit 201. In some examples, the first MOS transistor 203 is an NMOS transistor and the second MOS transistor 204 is a PMOS transistor. Correspondingly, the above circuit also includes an AFE (Analog Front End) chip and a control module 205. The AFE chip 206 is electrically connected to a plurality of series-connected battery cells 101 and is configured to collect the temperature and voltage data of the battery cells 101. The control module 205 is electrically connected to the AFE chip 206, the first MOS transistor 203 and the second MOS transistor 204, and is configured to control the on-off switching of the first MOS transistor 203 and the second MOS transistor 204 based on the collected data of the AFE chip 206, thereby realizing the circuit switching between the main circuit 200 and the branch circuit 201, so as to realize the embedding and extraction of the battery cells 101 in the entire electrical circuit, and achieve the purpose of stepless series connection and differential combination between subsequent modules. Specifically, during the operation of the circuit, the AFE chip 206 constantly monitors the voltage and temperature of the single battery cell 101. When it exceeds the set threshold, the control module 205 will close the first MOS transistor 203 on the main circuit 200 based on the data fed back by the AFE chip 206, and turn on the second MOS transistor 204 on the branch circuit 201, so that the battery cell 101 directly detaches from the system (in the application of a single module, the external output is 0V, and the positive port and the negative port are in a short-circuit conduction state), so as to realize the protection of the lithium battery module of the module.

[0039] In some embodiments, the above circuit also includes a fuse arranged on the main section 200a of the main circuit 200 and a current detection module 207 arranged on the main circuit 200. The fuse can be passively blown when the instantaneous or continuous current exceeds the current detection range, to avoid continuous short circuit of the battery. The current detection module 207 can detect the circuit current. When it detects that the current exceeds a predetermined threshold, the AFE chip 206 will perform the same actions as over-temperature and over-voltage protection, and control the switching between the main circuit 200 and the branch circuit 201 through the control module 205 to protect the module from damage.

[0040] On the other hand, the present application discloses a lithium battery, which is formed by connecting a plurality of lithium battery modules in series. Exemplarily, referring toFigure 4 , taking the installation of lithium batteries in light vehicles as an example, at this time, multiple lithium battery modules are assembled in the battery compartment 301 within the vehicle frame 300 and fixed by the installation pressing strip 302, and the multiple lithium battery modules are connected in series through the wire harness 303. At this time, based on the switching control of the main circuit 200 and the branch circuit 201 in the lithium battery module, the insertion and extraction of the battery cells 101 in a single module can be realized, thereby achieving the purpose of stepless series connection and differential combination between the modules.

[0041] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A protection board, characterized in that, On which a circuit is arranged, the circuit comprising: A main circuit, which includes a main section in which a plurality of battery cells are connected in series, and has a positive terminal port and a negative terminal port; A branch circuit, which is configured as a parallel circuit of the main section; A first MOS transistor, arranged on the main section; A second MOS transistor, arranged on the branch circuit; A control module, connected to the first MOS transistor and the second MOS transistor, and configured to control the operations of the first MOS transistor and the second MOS transistor to achieve the on / off and switching of the main circuit and the branch circuit.

2. The protection board according to claim 1, characterized in that: The circuit further includes: An AFE chip, connected to the plurality of chips and the control module, and configured to collect voltage and temperature data of the battery cells, and the control module is configured to automatically control the operations of the first MOS transistor and the second MOS transistor based on the collected data of the AFE chip to achieve the automatic on / off and switching of the main circuit and the branch circuit.

3. The protection board according to claim 1 or 2, characterized in that: A fuse is arranged on the main section.

4. The protection board according to claim 2, characterized in that: A current detection module is arranged on the main circuit, and the current detection module is connected to the AFE chip.

5. The protection board according to claim 1, characterized in that: The first MOS transistor is an NMOS transistor, and the second MOS transistor is a PMOS transistor.

6. A lithium battery module, characterized in that: Including a housing, an integrated cover plate, a protection plate, a top cover and a plurality of battery cells. A plurality of grooves for accommodating the battery cells are provided in the housing. The integrated cover plate, the protection plate and the top cover are assembled at the opening end of the housing. A circuit is provided on the protection plate, and the circuit includes: A main circuit, including a main section, the plurality of battery cells are connected in series on the main section, and the main circuit has a positive terminal port and a negative terminal port; A branch circuit, which is configured as a parallel circuit of the main section; A first MOS transistor, arranged on the main section; A second MOS transistor, arranged on the branch circuit; A control module, connected to the first MOS transistor and the second MOS transistor, and configured to control the operations of the first MOS transistor and the second MOS transistor to achieve the on / off and switching of the main circuit and the branch circuit.

7. A lithium battery module according to claim 6, characterized in that: The circuit further includes: An AFE chip, connected to the plurality of chips and the control module, and configured to collect voltage and temperature data of the battery cells, and the control module is configured to automatically control the operations of the first MOS transistor and the second MOS transistor based on the collected data of the AFE chip to achieve the automatic on / off and switching of the main circuit and the branch circuit.

8. A lithium battery module according to claim 6, characterized in that: Pole pieces in contact with the battery cells are provided on the integrated cover plate. A pole post is integrated on the protection plate, and an opening is provided at the corresponding position of the top cover for the pole post.

9. A lithium battery module according to claim 6, characterized in that: The number of the battery cells is a positive integer multiple of 4.

10. A lithium battery, characterized in that: Formed by connecting in series a plurality of lithium battery modules according to any one of claims 6-9.

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