Battery cell assembly and battery pack

Abstract

The utility model discloses a battery cell assembly and a battery pack. The battery cell assembly comprises a battery cell body, the battery cell comprises a battery cell body and a data acquisition module, the data acquisition module is installed on the battery cell body and electrically connected with the battery cell body, the data acquisition module is used for monitoring parameters of the battery cell body, the data acquisition module is provided with an optical communication module, and the data acquisition module transmits the monitored parameters outwards through the optical communication module. Due to the fact that the optical communication module is adopted to transmit data, the structure is simple, the response speed is high, signals are stable, stability and accuracy in the data transmission process can be improved, and potential safety hazards are reduced.

Description

Technical Field

[0001] This utility model relates to the technical field of batteries, and in particular to a cell assembly and a battery pack. Background Technology

[0002] Battery packs typically consist of multiple cells connected in series or parallel to increase the power of the battery pack.

[0003] Because battery cells are prone to thermal runaway, which can lead to fire, combustion, or even explosion, it is necessary to monitor the parameters of the battery cell itself and transmit the monitored parameters in order to determine the health status of the battery cell itself.

[0004] Therefore, how to provide a battery cell assembly that improves the stability of data transmission and thus reduces safety hazards is a technical problem that our technical personnel urgently need to solve. Utility Model Content

[0005] In view of this, the present invention provides a battery cell assembly that improves the stability of data transmission, thereby reducing safety hazards. Furthermore, the present invention also provides a battery pack having the above-mentioned battery cell assembly.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A battery cell assembly, comprising:

[0008] Battery cell body;

[0009] A data acquisition module is installed on and electrically connected to the battery cell body, and is used to monitor the parameters of the battery cell body. The data acquisition module has an optical communication module, through which the monitored parameters are transmitted to the outside.

[0010] Preferably, in the above-mentioned battery cell assembly, the optical communication module is at least two sets, and is distributed on different sides of the data acquisition module.

[0011] Preferably, in the above-mentioned battery cell assembly, the optical communication module includes a transmitting end and a receiving end, and the transmitting end and the receiving end are arranged on different sides of the data acquisition module.

[0012] Preferably, in the above-mentioned battery cell assembly, the data acquisition module is provided with a transmitting end and a receiving end on two sides along the first direction, respectively;

[0013] The first direction intersects with the thickness direction of the data acquisition module, and the thickness direction of the data acquisition module is the arrangement direction of the battery cell body and the data acquisition module.

[0014] Preferably, in the above-mentioned battery cell assembly, the data acquisition module is provided with a transmitting end and a receiving end on two sides along the second direction, respectively;

[0015] Furthermore, the second direction intersects with the first direction and also with the thickness direction.

[0016] Preferably, in the above-mentioned battery cell assembly, the data acquisition module integrates an equalization circuit, and the first side of the equalization circuit is connected in parallel with the battery cell body;

[0017] The data acquisition modules of adjacent battery cell assemblies are plugged in and connected, so that the second side of the equalization circuit of the adjacent data acquisition modules is electrically connected.

[0018] Preferably, in the above-mentioned battery cell assembly, a set of opposite sides of the data acquisition module are respectively provided with a first connector and a second connector;

[0019] The first connector can be plugged into and electrically connected to the second connector of the adjacent cell assembly, thereby electrically connecting the second side of the equalization circuit of the adjacent data acquisition module.

[0020] Preferably, in the above-mentioned battery cell assembly, the first connector is a straight plug;

[0021] The second connector is a resilient snap-fit ​​component capable of clamping the straight plug.

[0022] A battery pack comprising a plurality of electrically connected cell assemblies, wherein the cell assemblies are any of the cell assemblies described above.

[0023] Preferably, in the above-mentioned battery pack, the optical communication module includes a transmitting end and a receiving end arranged along a first direction, and in the battery cell assemblies arranged along the first direction, adjacent battery cell assemblies are communicatively connected through the transmitting end and the receiving end arranged along the first direction.

[0024] The first direction intersects with the thickness direction of the data acquisition module of the battery cell assembly, and the thickness direction of the data acquisition module is the arrangement direction of the battery cell body and the data acquisition module.

[0025] Preferably, in the above-mentioned battery pack, the optical communication module includes a transmitting end and a receiving end arranged along the second direction, and in the battery cell assemblies arranged along the second direction, adjacent battery cell assemblies are communicatively connected through the transmitting end and the receiving end arranged along the second direction.

[0026] The second direction intersects the first direction and the thickness direction.

[0027] Preferably, the battery pack further includes a signal control module, wherein the data acquisition module of the battery cell assembly is connected to the signal control module via optical communication.

[0028] Preferably, in the battery pack described above, among the battery cell assemblies arranged along the first direction, the data acquisition modules of adjacent battery cell assemblies are plugged in and connected; the battery cell assembly at the middle end of the battery cell assembly arranged along the first direction is connected to the battery cell assembly adjacent to it along the second direction via a wiring harness.

[0029] This utility model discloses a battery cell assembly. The battery cell body integrates a data acquisition module, which collects parameters of the battery cell body. The data acquisition module transmits the monitored parameters externally using an optical communication module. Because the optical communication module is used to transmit data, the structure is simple, the response speed is fast, and the signal is stable, which helps to improve the stability and accuracy of data transmission, thereby reducing safety hazards. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of the battery cell assembly in the first direction disclosed in the embodiments of this utility model;

[0032] Figure 2 This is a schematic diagram of the optical signal transmission method of the battery pack disclosed in the embodiments of this utility model;

[0033] Figure 3 This is a schematic diagram of the balancing principle of the battery pack disclosed in the embodiments of this utility model;

[0034] Figure 4 This is a connection diagram of the battery pack disclosed in the embodiments of this utility model;

[0035] Figure 5 for Figure 4 A magnified view of part A in the image;

[0036] Figure 6 This is a schematic diagram of the second direction of the battery cell assembly disclosed in the embodiments of this utility model;

[0037] Figure 7 This is a schematic diagram of the data acquisition unit of the battery cell assembly disclosed in the embodiments of this utility model. Detailed Implementation

[0038] This utility model discloses a battery cell assembly that improves the stability of data transmission, thereby reducing safety hazards. Furthermore, this utility model also discloses a battery pack incorporating the aforementioned battery cell assembly.

[0039] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0040] Hereinafter, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

[0041] The primary function of a battery pack is to store and release electrical energy. Its built-in battery cells can store electrical energy to provide power for devices.

[0042] Battery packs typically consist of multiple cells connected in series or parallel to increase the pack's functionality.

[0043] Because battery cells are prone to thermal runaway, which can lead to fires or even explosions, it is necessary to monitor the parameters of the battery cell itself to determine its health status.

[0044] Based on this, this application discloses a battery cell assembly that monitors the health status of the battery cell body and transmits the monitored parameters of the battery cell body to a signal control module, so as to determine the health status of the battery cell body through the signal control module, thereby reducing safety hazards.

[0045] like Figure 1 As shown, the battery cell assembly 100 includes: a battery cell body 1 and a data acquisition module 2.

[0046] Among them, the battery cell body 1 is the core component of energy storage, used to realize the storage of electrical energy.

[0047] Data acquisition module 2 is installed on and electrically connected to the battery cell body 1, enabling it to draw power from the battery cell body 1. For example, the battery cell body 1 has a positive electrode and a negative electrode. Data acquisition module 2 is connected to both the positive and negative electrodes, thus achieving electrical connection with the battery cell body 1. Data acquisition module 2 is used to monitor parameters of the battery cell body 1. For example, the parameters of the battery cell body 1 include, but are not limited to, one or more of the following: voltage, current, temperature, resistance, and thermal runaway state.

[0048] The data acquisition module 2 has an optical communication module 21, and the data acquisition module 2 transmits the monitored parameters to external devices (including but not limited to signal control modules) through the optical communication module 21.

[0049] It is understood that the battery cell body 1 in this application integrates a data acquisition module 2 and uses the data acquisition module 2 to collect parameters of the battery cell body 1. The data acquisition module 2 uses the optical communication module 21 to transmit the monitored parameters to the outside. The external signal control module can determine the health status of the battery based on the parameters collected by the data acquisition module 2, thereby determining whether there is any abnormality in the battery cell body 1, that is, it can detect problems with the battery cell body in a timely manner, thereby reducing safety hazards.

[0050] Using optical communication module 21 to transmit data has a simple structure, fast response speed, and stable signal, which helps to improve the stability and accuracy of data transmission, thereby reducing security risks.

[0051] Specifically, the battery cell body 1, which integrates the data acquisition module 2, can monitor and record the data changes inside the battery cell body 1 in real time after the battery cell assembly is off the production line. This truly realizes the monitoring of the health status of the battery cell throughout its entire life cycle. As long as the data from the data acquisition module 2 is imported and analyzed in conjunction with the corresponding signal control module, problems with the battery cell body can be detected in a timely manner.

[0052] like Figure 1 As shown, the battery cell assembly 100 in this application has at least two sets of optical communication modules 21, which are arranged on different sides of the data acquisition module 2. By increasing the number of optical communication modules 21 and placing them on different sides of the data acquisition module 2, data transmission in different directions can be achieved, reducing signal interference.

[0053] For example, the optical communication module 21 includes a transmitter 211 and a receiver 212.

[0054] The transmitting end 211 and the receiving end 212 are arranged on different sides of the data acquisition module 2. In some embodiments, the transmitting end 211 and the receiving end 212 are arranged on opposite sides of the data acquisition module 2 to enable data transmission in that direction. Optionally, the transmitting end 211 and the receiving end 212 are arranged facing each other to reduce the size of the optical fiber arrangement.

[0055] In this application, by arranging the transmitting end 211 and the receiving end 212 on different sides of the data acquisition module 2, the position and direction of signal transmission of the data acquisition module 2 can be changed as needed to adapt to different requirements.

[0056] It should be noted that the working process of the optical communication module 21 in this application is as follows:

[0057] Signal modulation: At the transmitting end 211, the electrical signal is converted into an optical signal by a modulator. This is usually achieved by adjusting the intensity, phase, or frequency of the light.

[0058] Fiber optic transmission: The modulated optical signal is transmitted to the receiving end 212 through optical fiber. Fiber optics have high bandwidth and low loss characteristics, enabling them to support large-capacity data transmission.

[0059] Signal detection: At the receiver 212, the photodetector converts the optical signal back into an electrical signal. This process typically involves the photoelectric effect, converting the optical signal into an electrical signal, followed by demodulation and decoding.

[0060] In some embodiments, the data acquisition module 2 in the battery cell assembly 100 of this application is provided with a transmitting end 211 and a receiving end 212 on two sides along a first direction. The data acquisition module 2 is provided with a transmitting end 211 and a receiving end 212 on two sides along a second direction.

[0061] The above configuration enables the data acquisition module 2 to transmit data in the first and second directions, so as to facilitate signal transmission between the battery cell assemblies 100 arranged in different directions.

[0062] It should be noted that the first direction in this paper intersects the thickness direction of the data acquisition module 2, and the second direction intersects both the thickness direction and the first direction. The thickness direction of the data acquisition module 2 is the relative arrangement direction between the data acquisition module 2 and the battery cell body 1. For example, the data acquisition module 2 has a rectangular structure, and the first direction is perpendicular to the thickness direction, while the second direction is perpendicular to both the first and thickness directions. In this paper, one side of the data acquisition module 2 along the thickness direction is attached to and detachably connected to the battery cell body 1. Figure 1 For example, the first direction is the width direction of the data acquisition module 2, and the second direction is the length direction of the data acquisition module 2.

[0063] In some embodiments, the positions of the transmitting end 211 and the receiving end 212 of the data acquisition module 2 arranged along the first direction can be interchanged. Similarly, the positions of the transmitting end 211 and the receiving end 212 of the data acquisition module 2 arranged along the second direction can be interchanged.

[0064] In other alternative embodiments, the optical communication module 21 involved in this application embodiment may only include a transmitter 211 for transmitting data to the outside world. It can be understood that the battery cell bodies 1 disclosed in this application embodiment may not transmit signals to each other through the optical communication module 21, and the data collected by the data acquisition module 2 may be transmitted to the external controller or host computer through the optical communication module 21.

[0065] Combination Figure 2 As shown, the battery pack 1000 includes a plurality of electrically connected cell assemblies 100, and the cell assembly 100 is the cell assembly 100 disclosed in the above embodiments. Therefore, the battery pack 1000 having the cell assembly 100 also has all the above-mentioned technical effects, which will not be described in detail here.

[0066] Figure 2 As shown, multiple battery cell assemblies 100 are arranged along the second direction, and multiple rows of battery cell assemblies 100 are arranged along the first direction.

[0067] In the battery cell assembly 100 arranged along the second direction, the data acquisition module 2 of adjacent battery cell assemblies 100 transmits signals sequentially through a transmitting end 211 and a receiving end 212 arranged along the second direction. Specifically, in the three battery cell assemblies 100 arranged sequentially along the second direction, the middle battery cell assembly 100 receives the signal from the transmitting end 211 of the battery cell assembly 100 on one side along the second direction at its receiving end 212, and the middle battery cell assembly 100 receives the signal from the receiving end 212 of the battery cell assembly 100 on the other side along the second direction at its transmitting end 211.

[0068] In some embodiments, the data acquisition module 2 of the battery cell assembly 100 arranged adjacent to each other along the first direction realizes the sequential transmission of signals through the transmitting end 211 and the receiving end 212 arranged along the first direction.

[0069] For example, in a cell assembly 100 arranged along the second direction, the data acquisition module 2 located at the end and the data acquisition module 2 of the cell assembly 100 adjacent along the first direction transmit signals sequentially through a transmitting end 211 and a receiving end 212 arranged along the first direction.

[0070] like Figure 2 As shown, in some embodiments, the battery pack 1000 further includes a signal control module 200, wherein the signal control module 200 is connected to the data acquisition module 2 of the cell assembly 100 via optical communication.

[0071] For example, the signal control module 200 has an optical communication module 21, and the receiving end of the signal control module 200 receives the signal from the transmitting end 211 of the data acquisition module 2 of the cell assembly 100; the transmitting end of the signal control module 200 sends a signal to the receiving end 212 of the data acquisition module 2 of the cell assembly 100.

[0072] The above describes the data transmission method between the data acquisition modules 2 of adjacent cell assemblies 100 in the battery pack 1000, and the data transmission method between the data acquisition module 2 of the cell assembly 100 and the signal control module 200. The following uses the transmission of power data as an example to describe in detail the optical communication process of the battery pack 1000 in this application.

[0073] In some embodiments, the data acquisition module 2 can be used to transmit power information and pass the power information to the signal control module 200. The signal control module 200 determines whether the power of the cell assembly 100 in the battery pack 1000 is consistent based on the acquired power information.

[0074] When the charge levels of the cell assemblies 100 in the battery pack 1000 are different, the charge levels of the cell assemblies 100 can be balanced to ensure that the charge levels of all cell bodies 1 in the battery pack 1000 are consistent, thereby improving the charging and discharging efficiency of the battery pack 1000.

[0075] In order to balance the power of the battery cell assembly 100, in some embodiments, an equalization circuit 3 is integrated into the data acquisition module 2 of the battery cell assembly 100.

[0076] like Figure 3 As shown, the first side 31 of the equalization circuit 3 is connected in parallel with the cell body 1; the data acquisition module 2 of the adjacent cell assembly 100 is plugged in and connected, so that the second side 32 of the equalization circuit 3 of the adjacent data acquisition module 2 is electrically connected.

[0077] The data acquisition module 2 of the battery cell assembly 100 in this application integrates an equalization circuit 3 to achieve equalization of the charge of the battery cells 1 connected in series in the battery pack 1000. For example, the equalization circuit 3 may include, but is not limited to, a DC / DC module.

[0078] like Figure 4 As shown, adjacent data acquisition modules 2 in the battery cell assemblies 100 arranged along the second direction are sequentially plugged in and electrically connected, thereby electrically connecting the second side 32 of the equalization circuit 3 of the adjacent data acquisition modules 2 along the second direction. The data acquisition module 2 at the end of the battery cell assembly 100 in the second direction is connected to the data acquisition module 2 of another row of battery cell assemblies 100 via a wiring harness 300, thereby electrically connecting the second side 32 of the equalization circuit 3 of the adjacent data acquisition modules 2 along the first direction.

[0079] The following combination Figures 5 to 7 The connection method of data acquisition module 2 is explained.

[0080] like Figure 6 and Figure 7 As shown, a first connector 22 is provided on one side of the data acquisition module 2, and a second connector 23 is provided on the other side. For example, the first connector 22 and the second connector 23 are distributed on two sides of the data acquisition module 2 along the second direction.

[0081] After the battery cell body 1 is connected in series, the first connector 22 of the data acquisition module 2 of the battery cell assembly 100 is plugged into the second connector 23 of the data acquisition module 2 of the adjacent battery cell assembly 100; the second connector 23 of the data acquisition module 2 of the battery cell assembly 100 is plugged into the first connector 22 of the data acquisition module 2 of the adjacent battery cell assembly 100 on the other side, thereby realizing the electrical connection between the equalization circuits 3 of the adjacent battery cell assemblies 100.

[0082] Using the above connection method, when the signal control module 200 detects that the charge of all the battery cells 1 is different, the charge can be transferred through the connection of the first connector 22, the second connector 23 and the wire harness 300, so as to achieve the balance (identity) of the charge of all the battery cells 1.

[0083] In some embodiments, the first connector 22 is a straight plug, and the second connector 23 is a resilient snap-fit ​​connector capable of clamping the straight plug. For example, the second connector 23 is a metal U-shaped card with a small gap at the opening, and the first connector 22 is a metal strip. During the insertion of the first connector 22 and the second connector 23, the metal strip presses against the opening of the U-shaped card, enlarging the opening and clamping the metal strip until it is inserted into the U-shaped card, thus completing the insertion of the first connector 22 and the second connector 23.

[0084] During the operation of the battery pack 1000, the data acquisition module 2 will collect data such as pressure, voltage, internal resistance, temperature and power of the battery cell body 1 in real time or intermittently, and then send the data to the signal control module 200 of the battery pack 1000 through the optical communication module 21.

[0085] When the signal control module 200 determines that the charge of a certain cell body 1 is too high, the signal control module 200 controls the charge of that cell body 1 to be transferred to the cell body 1 with a lower charge, so that the charge of the cell body 1 in the battery pack 1000 is kept consistent, thereby improving the charging and discharging efficiency of the battery pack.

[0086] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0087] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An electrochemical cell assembly, comprising: The application relates to an electric core assembly (100) comprising: an electric core body (1); a data acquisition module (2) installed on the electric core body (1) and electrically connected with the electric core body (1), wherein the data acquisition module (2) is used for monitoring parameters of the electric core body (1), the data acquisition module (2) has an optical communication module (21), and the data acquisition module (2) transmits the monitored parameters to the outside through the optical communication module (21). The optical communication module (21) is at least two groups and is distributed on different sides of the data acquisition module (2).

2. The cell assembly of claim 1, wherein, The optical communication module (21) comprises a sending end (211) and a receiving end (212), and the sending end (211) and the receiving end (212) are arranged on different sides of the data acquisition module (2).

3. The cell assembly of claim 2, wherein, The sending end (211) and the receiving end (212) are respectively arranged on two side surfaces of the data acquisition module (2) along a first direction. The first direction intersects with a thickness direction of the data acquisition module (2), and the thickness direction is an arrangement direction of the electric core body (1) and the data acquisition module (2).

4. The cell assembly of claim 3, wherein, The sending end (211) and the receiving end (212) are respectively arranged on two side surfaces of the data acquisition module (2) along a second direction. The second direction intersects with the first direction and the thickness direction.

5. The cell assembly of any one of claims 1 to 4, wherein, An equalization circuit (3) is integrated in the data acquisition module (2), and a first side (31) of the equalization circuit (3) is connected in parallel with the electric core body (1). The data acquisition modules (2) of adjacent electric core assemblies (100) are connected in plug-in mode, so that a second side (32) of the equalization circuit (3) of the adjacent data acquisition modules (2) is electrically connected.

6. The cell assembly of claim 5, wherein, First connectors (22) and second connectors (23) are respectively arranged on opposite sides of the data acquisition module (2). The first connectors (22) can be plugged into and electrically connected with the second connectors (23) of adjacent electric core assemblies, so that the second side (32) of the equalization circuit (3) of the adjacent data acquisition modules (2) is electrically connected.

7. The cell assembly of claim 6, wherein, The first connectors (22) are straight plugs. The second connectors (23) are elastic clamping members capable of clamping the straight plugs.

8. A battery pack, characterized by, The application further relates to a plurality of electric core assemblies (100) electrically connected, wherein the electric core assemblies (100) are the electric core assembly (100) as claimed in any one of claims 1 to 7.

9. The battery pack of claim 8, wherein, The optical communication module (21) comprises a sending end (211) and a receiving end (212) arranged along a first direction, and adjacent electric core assemblies (100) are connected in communication through the sending end (211) and the receiving end (212) arranged along the first direction. The first direction intersects with a thickness direction of a data acquisition module (2) of the electric core assembly (100), and the thickness direction is an arrangement direction of the electric core body (1) and the data acquisition module (2).

10. The battery pack of claim 9, wherein, The optical communication module (21) comprises a sending end (211) and a receiving end (212) arranged along a second direction, and among the electric core assemblies (100) arranged along the second direction, adjacent electric core assemblies (100) are connected in communication through the sending end (211) and the receiving end (212) arranged along the second direction. The second direction intersects the first direction and intersects the thickness direction.

11. The battery pack of claim 9 or 10, wherein, Further comprising: A signal control module (200), and the data acquisition module (2) of the electric core assembly (100) is connected with the signal control module (200) in an optical communication mode.

12. The battery pack of claim 11, wherein, Among the electric core assemblies (100) arranged along the first direction, the data acquisition modules (2) of adjacent electric core assemblies (100) are connected in plug-in connection; the electric core assembly (100) at the end of the electric core assemblies (100) arranged along the first direction is connected with the electric core assembly (100) adjacent along the second direction through a wire harness (300).

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