Battery cell and battery pack

Abstract

The utility model discloses a battery cell and a battery pack, the battery cell comprises a battery cell main body, at least one pole and a battery cell information acquisition module, and the at least one pole is connected with the battery cell main body; the cell information acquisition module is connected with at least one pole; the pole comprises a first connecting part connected to the battery cell main body and a second connecting part located on the side surface of the first connecting part and connected with the first connecting part, the first connecting part is used for connecting an external component, and the second connecting part is used for connecting a battery cell information acquisition module; signal acquisition of the battery cell information acquisition module and strong current connection between the battery cell main body and external components can be separated, power supply and information acquisition of the battery cell information acquisition module are guaranteed, and connection of the external components during system integration is guaranteed. And the welding flatness of the external component and the pole cannot be influenced after the cell information acquisition module is welded with the pole, so that the explosion welding condition is avoided, and the product stability and the process welding quality are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to power battery technical field, especially a kind of electric core and battery pack. BACKGROUND

[0002] Power battery generally includes box and the multiple electric cores of being set in box. In order to realize the monitoring (for example temperature sampling, voltage sampling, overcurrent fuse etc.) of battery, technical personnel designs BMS (Battery Management System, battery management system). With the development of technology, wireless BMS technology has become mature, wireless BMS mainly transmits battery information by wireless communication technology, not only can improve communication convenience, but also can significantly reduce the use cost of wiring harness.

[0003] In the relevant wireless BMS technology, the positive and negative poles of electric core information acquisition module and busbar are welded on the same side of the electric core pole. Because the side area of electric core pole is limited, when welding electric core information acquisition module and busbar in sequence, the surface of electric core pole is prone to be uneven, which leads to the occurrence of explosive welding, and has great safety risk. UTILITARIAN CONTENT

[0004] The main purpose of the utility model is to provide a kind of electric core and battery pack, to solve the technical problem that existing electric core is prone to explosive welding when welding electric core information acquisition module and busbar.

[0005] To achieve the above-mentioned purpose, the utility model provides a kind of electric core, comprising:

[0006] Electric core main body;

[0007] At least one pole, connected with the electric core main body;

[0008] Electric core information acquisition module, connected with the at least one pole;

[0009] Wherein, the pole includes the first connecting part connected to the electric core main body and the second connecting part located on the side of the first connecting part and connected with the first connecting part, the first connecting part is used to connect external components, and the second connecting part is used to connect the electric core information acquisition module.

[0010] In some embodiments, the height of the first connecting part and the second connecting part is consistent.

[0011] In some embodiments, the second connecting part is arranged around the circumferential side of the first connecting part.

[0012] In some embodiments, two pole posts are provided and are spaced apart on the surface of the battery cell body, the first connecting portion of each of the two pole posts is connected with the external component, and the battery cell information acquisition module is located between the two pole posts and is connected with the second connecting portion of each of the two pole posts.

[0013] In some embodiments, the battery cell further comprises an explosion-proof valve, which is provided on the side of the battery cell body on which the battery cell information acquisition module is not mounted.

[0014] In some embodiments, the battery cell information acquisition module comprises a flexible circuit board temperature acquisition module, a voltage acquisition module and an antenna module, the flexible circuit board is provided on the surface of the battery cell body, the temperature acquisition module, the voltage acquisition module and the antenna module are integrated on the side of the flexible circuit board which is opposite to the battery cell body, the antenna module is in communication connection with the temperature acquisition module and the voltage acquisition module and is used for transmitting the acquisition signal.

[0015] In some embodiments, the battery cell information acquisition module further comprises a reinforcing plate, which is provided on the side of the flexible circuit board which faces the battery cell body.

[0016] In some embodiments, the battery cell further comprises a top cover, which is connected to the top of the battery cell body, the top cover is provided with a first through hole and a second through hole in the axial direction, the pole post passes through the first through hole and is connected with the battery cell body, the battery cell information acquisition module is provided between the top cover and the battery cell body and at least partially protrudes from the second through hole.

[0017] In some embodiments, the battery cell further comprises a glue layer, one side of the glue layer is connected with the flexible circuit board, and the other side of the glue layer is connected with the top cover; and / or,

[0018] The surface of the top cover which is away from the battery cell body is provided with a clamping groove for fixing an external antenna.

[0019] The utility model further provides a battery pack, including box body and a plurality of battery cells, the battery cell is contained in the box body.

[0020] The pole provided by the application comprises a first connecting part and a second connecting part located on the side of the first connecting part and connected with the first connecting part; the first connecting part is used for connecting external components, and the second connecting part is used for connecting a battery cell information acquisition module; this design can separate the signal acquisition of the battery cell information acquisition module and the strong electric connection between the battery cell main body and the external components, can ensure the power supply and information acquisition of the battery cell information acquisition module, and can ensure the connection of the external components during system integration, and will not affect the welding flatness of the external components and the pole after the battery cell information acquisition module is connected and welded with the pole, so that the explosion welding condition is avoided, and the product stability and process welding quality are improved. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a structural schematic view of one embodiment of the battery cell of the utility model;

[0022] Figure 2 It is a disassembled schematic view of one embodiment of the battery cell of the utility model;

[0023] Figure 3 It is a disassembled schematic view of one embodiment of the battery cell of the utility model.

[0024] BRIEF DESCRIPTION OF DRAWINGS:

[0025] Reference Name Reference Name 100 Battery cell 10 Battery cell body 20 Pole 30 Battery cell information acquisition module 21 First connecting part 22 Second connecting part 40 Explosion-proof valve 31 Flexible circuit board 32 Temperature acquisition module 33 Voltage acquisition module 50 Top cover 51 Clamping groove 52 First through hole 53 Second through hole 34 Reinforcing plate

[0026] The implementation, functional features and advantages of the utility model will be further described with reference to the drawings in combination with embodiments. DETAILED DESCRIPTION

[0027] The scheme in the embodiments of the utility model will be clearly and completely described in combination with the drawings in the embodiments of the utility model, and obviously, the described embodiments are only a part of the embodiments in the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the utility model.

[0028] It should be noted that all directionality indications (such as up, down, left, right, front, back, etc.) in the embodiments of the utility model are only used for explaining the relative position relationship, movement condition, etc. between components in a certain specific posture (as shown in the drawings), and if the specific posture changes, the directionality indications also change accordingly.

[0029] It should also be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or can have a middle element simultaneously. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or can have a middle element simultaneously.

[0030] In addition, the description of "first", "second" and the like in the present application is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the technical features or implying the number of the indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor in the protection scope required by the present application.

[0031] Please refer to Figure 1 and Figure 2 , an embodiment of the present application proposes a kind of electric core 100, including electric core main body 10, at least one pole 20 and electric core information acquisition module 30;At least one pole 20 is connected with electric core main body 10;Electric core information acquisition module 30 is connected with at least one pole 20;

[0032] Wherein, pole 20 includes the first connecting portion 21 connected to electric core main body 10 and the second connecting portion 22 located at the side of the first connecting portion 21 and connected with the first connecting portion 21, the first connecting portion 21 is used to connect external components, and the second connecting portion 22 is used to connect electric core information acquisition module 30.

[0033] Electric core main body 10 as the core part of electric core 100, undertakes the main function of storing and releasing electric energy;Pole 20 plays the role of bridge connecting electric core main body 10 and external circuit and other components, so that electric core 100 can carry out electric energy transmission and interaction with external equipment;Electric core information acquisition module 30 can acquire various state information of electric core 100 in working process, voltage, current, temperature and other data by being connected with pole 20, so as to monitor and evaluate the performance, health condition and the like of electric core 100.

[0034] It should be noted that pole 20 (the first connecting portion 21, the second connecting portion 22) and electric core main body 10, electric core information acquisition module 30 and pole 20, the second connecting portion 22 and the first connecting portion 21 can be electrically connected to realize electric energy conduction.

[0035] In this embodiment, the first connecting part 21 is connected to the cell body 10 and is a key part for realizing the conduction of electric energy between the pole 20 and the cell body 10. The first connecting part 21 is directly connected to the electrode material (such as the positive or negative material in a lithium ion battery) inside the cell body 10, thereby ensuring that the electric energy can be smoothly transmitted from the cell body 10 to the pole 20. The first connecting part 21 is mainly used for connecting external components, such as connecting other circuit elements in a battery pack, load devices (such as mobile phones, tablet computers, and other electrical devices), and the like. The first connecting part 21 can output the electric energy stored in the cell 100 to external devices to realize the power supply function. At the same time, the first connecting part 21 can also receive the charging current from the external devices to realize the charging process.

[0036] The second connecting part 22 is located on the side of the first connecting part 21 and is connected to the first connecting part 21. This side connection manner enables the second connecting part 22 to cooperate with the first connecting part 21 in spatial layout, while not affecting the connection function of the first connecting part 21 and the external components. The cell information acquisition module 30 can accurately acquire the voltage, current, and other data conducted by the pole 20 during the working process of the cell 100, thereby realizing effective monitoring of the state of the cell 100.

[0037] In this embodiment, the first connecting part 21 and the second connecting part 22 of the pole 20 clearly divide different functional areas. Specifically, the first connecting part 21 focuses on the transmission of electric energy with external components, thereby guaranteeing the normal power supply and charging functions of the cell 100. The second connecting part 22 is dedicated to the cell information acquisition module 30, thereby ensuring the smooth progress of information acquisition. This clear functional division is conducive to simplifying the overall design and wiring of the cell 100, reducing the possibility of mutual interference between different functions, and improving the stability and reliability of the cell 100. Moreover, this design can separate the signal acquisition of the cell information acquisition module 30 and the strong electric connection between the cell body 10 and the external components. The design can guarantee the power supply and information acquisition of the cell information acquisition module 30 and can guarantee the connection of the external components during system integration. The design does not affect the flatness of the welding between the external components and the pole 20 after the cell information acquisition module 30 is connected and welded to the pole 20, thereby avoiding the occurrence of explosive welding and improving the product stability and process welding quality.

[0038] In some embodiments, the height of the first connecting part 21 is consistent with the height of the second connecting part 22.

[0039] When the heights of the first connecting part 21 and the second connecting part 22 are consistent, the stress of the pole 20 is more uniform from the overall structure. In the process of connecting the battery cell 100 with external components and the battery cell information acquisition module 30, whether it is subjected to vertical pressure or stress in other directions, due to the same height, the force distribution is more balanced, and the additional stress concentration phenomenon caused by the height difference can be reduced. This helps to improve the connection stability between the pole 20 and the battery cell body 10, reduces the risk of the pole 20 loosening, falling off or being damaged due to uneven stress at the connection site, and thus ensures the electrical connection reliability of the battery cell 100 during use.

[0040] It should be noted that the heights of the first connecting part 21 and the second connecting part 22 can also be substantially consistent, for example, there is a difference of ±1mm between the height of the first connecting part 21 and the height of the second connecting part 22.

[0041] In some embodiments, the second connecting part 22 is arranged around the periphery of the first connecting part 21.

[0042] The second connecting part 22 is arranged around the periphery of the first connecting part 21, and in the process of assembling, transporting and using the battery cell 100, when subjected to external force impact, vibration and the like, this structure can jointly bear external force, enhance the overall mechanical strength of the pole 20, and reduce the possibility of damage to the pole 20 due to external force, thereby ensuring the stable connection of the battery cell 100 with external components and the normal performance of information acquisition work.

[0043] In some embodiments, two poles 20 are provided, which are spaced apart on the surface of the battery cell body 10, and the first connecting part 21 of each of the two poles 20 is connected with an external component, and the battery cell information acquisition module 30 is located between the two poles 20 and is connected with the second connecting part 22 of each of the two poles 20.

[0044] Among them, the two poles 20 correspond to the positive and negative poles of the battery cell 100 respectively, and the two poles 20 are spaced apart on the surface of the battery cell body 10, which can reasonably arrange the connection with external components in space, and avoid problems such as wiring difficulty or mutual interference caused by too concentrated connection lines.

[0045] In this embodiment, through the connection of the battery cell information acquisition module 30 and the second connecting part 22 of the two poles 20, comprehensive information about the battery cell 100 at the two poles 20 can be obtained. Compared with the case of connecting only one pole 20, this arrangement can more accurately reflect the overall working state of the battery cell 100, including the voltage difference between the two ends of the battery cell 100, the current balance condition, etc., providing a richer data basis for battery management.

[0046] In addition, the two pole columns 20 are respectively connected with external components and the information acquisition function of the battery cell information acquisition module 30, so that the battery cell 100 can be better integrated into the whole battery management system. The battery cell 100 can not only effectively realize the transmission and exchange of electric energy, but also can provide real-time state information of itself, so that the system can take corresponding management measures, realizes the cooperative work of the battery cell 100 and the external system, and improves the stability and reliability of the whole system.

[0047] In the normal use process of the battery cell 100, a series of chemical reactions will occur inside (for example, the reaction between the electrode material and the electrolyte in the charging and discharging process of the lithium ion battery). If due to some abnormal conditions, such as internal short circuit, overheating, etc., a large amount of gas may be generated inside the battery cell 100, causing the internal pressure to rise sharply.

[0048] In order to solve the above problems, please refer to Figure 3 In some embodiments, the battery cell 100 further comprises an explosion-proof valve 40, which is arranged on the side of the battery cell main body 10 which is not installed with the battery cell information acquisition module 30. The explosion-proof valve 40 is designed to automatically open when the internal pressure reaches a certain threshold, so as to rapidly release the high-pressure gas accumulated inside the battery cell 100 to the external environment, avoiding the explosion or other serious safety accidents of the battery cell 100 caused by the excessive internal pressure.

[0049] In this embodiment, the explosion-proof valve 40 is arranged on the side which is not installed with the battery cell information acquisition module 30, realizing the clear division of different functional areas of the battery cell 100. The area where the battery cell information acquisition module 30 is located is mainly responsible for information acquisition and monitoring of the working state of the battery cell 100, so as to effectively manage the battery cell 100; and the area where the explosion-proof valve 40 is located focuses on dealing with possible safety risks, ensuring the safe operation of the battery cell 100. Such clear functional division helps to simplify the overall design and maintenance idea of the battery cell 100, and can quickly locate whether the problem is in the information acquisition or the safety protection when the problem occurs.

[0050] Since the battery cell information acquisition module 30 usually needs to perform relatively precise electrical signal acquisition and transmission work, if the explosion-proof valve 40 is arranged too close to the battery cell information acquisition module 30, the explosion-proof valve 40 may interfere with the normal work of the battery cell information acquisition module 30 during the opening and closing process (such as the slight vibration caused by the pressure change), affecting the accuracy of information acquisition. By arranging the explosion-proof valve 40 on a relatively independent side, the embodiment can effectively avoid such mutual interference, ensure that the battery cell information acquisition module 30 can stably and accurately acquire various state information of the battery cell 100, and also ensure that the explosion-proof valve 40 can normally play its pressure release function when needed.

[0051] The present embodiment arranges the position of the explosion-proof valve 40 in combination with the layout of the cell information acquisition module 30, realizes clear functional division and avoids mutual interference, is beneficial to the daily maintenance and troubleshooting of the cell 100, is helpful to improve the rationality and compactness of the overall design of the cell 100, makes the cell 100 better adapt to the needs of different products, and realizes efficient electric energy storage and transmission function on the basis of ensuring safety.

[0052] In some embodiments, the cell information acquisition module 30 includes a flexible circuit board 31, a temperature acquisition module 32, a voltage acquisition module 33, and an antenna module. The flexible circuit board 31 is arranged on the surface of the cell body 10. The temperature acquisition module 32, the voltage acquisition module 33, and the antenna module are integrated on the side of the flexible circuit board 31 opposite to the cell body 10. The wire module is in communication connection with the temperature acquisition module 32 and the voltage acquisition module 33, and is used for transmitting the collected signals.

[0053] The temperature acquisition module 32 is used for acquiring the temperature information of the cell 100, and the voltage acquisition module 33 is used for measuring the voltage of the cell 100. The collected temperature and voltage signals are transmitted to the antenna module through the internal circuit. The antenna module can transmit the collected temperature and voltage signals in real time, so that the battery management system can obtain the state information of the cell 100 in time. For example, during the charging and discharging process of the battery, if the temperature of a certain cell 100 is too high or the voltage is abnormal, the battery management system can quickly receive the signal and take corresponding measures, such as adjusting the charging current or starting the cooling system, so as to avoid the safety hazards such as overheat and overcharge of the battery, and prolong the service life of the battery.

[0054] In the present embodiment, the temperature acquisition module 32, the voltage acquisition module 33, and the antenna module are integrated on the flexible circuit board 31, which not only reduces the number of external wires, simplifies the circuit structure, and reduces the probability of failure caused by too many wire connections, but also makes the whole module more compact.

[0055] In some embodiments, the cell information acquisition module 30 further includes a reinforcing plate 34 arranged on the side of the flexible circuit board 31 facing the cell body 10.

[0056] Due to the presence of the reinforcing plate 34, the service life of the flexible circuit board 31 is significantly extended. In complex and variable working environments, it can better resist mechanical damage and reduce maintenance and replacement costs caused by circuit board damage. At the same time, the reinforcing plate 34 provides a more convenient installation and fixation plane for the flexible circuit board 31. When assembling the battery module, the flexible circuit board 31 can be more firmly installed on the cell 100 or the frame of the battery module through the reinforcing plate 34. For example, the reinforcing plate 34 is fixed by using screws or glue, etc. In this way, it can ensure that the flexible circuit board 31 is in the correct position for temperature and voltage collection, and it is also more convenient to operate the flexible circuit board 31 during the subsequent maintenance or repair of the battery system.

[0057] Please continue to refer to Figure 1 and Figure 2 In some embodiments, the cell 100 further comprises a top cover 50 connected to the top of the cell body 10, the top cover 50 is provided with a first through hole 52 and a second through hole 53 in the axial direction, the pole 20 passes through the first through hole 52 and is connected with the cell body 10, the cell information collection module 30 is arranged between the top cover 50 and the cell body 10, and at least part of it is exposed to the second through hole 53.

[0058] The size and shape of the first through hole 52 match the pole 20, which helps to accurately position and fix the pole 20 to a certain extent. When the pole 20 passes through the first through hole 52, the inner wall of the first through hole 52 can constrain the pole 20 to keep it in the correct position in the axial direction, preventing the pole 20 from moving or shaking too much during the operation of the cell 100, thereby ensuring the stability of the electrical connection.

[0059] The presence of the second through hole 53 ensures that the cell information collection module 30 can accurately dock with the cell body 10. After passing through the second through hole 53, the cell information collection module 30 can be attached to the corresponding part of the surface of the cell 100, thereby realizing accurate collection of the true state of the cell 100. For example, the temperature collection module 32 can be close to the surface of the cell 100 to accurately measure the actual working temperature of the cell 100, and the voltage collection module 33 can also be accurately connected to the electrode position of the cell 100 to obtain accurate voltage values.

[0060] In some embodiments, the cell 100 further comprises an adhesive layer, one side of the adhesive layer is connected with the flexible circuit board 31, and the other side of the adhesive layer is connected with the top cover 50; and / or,

[0061] The surface of the top cover 50 away from the cell body 10 is provided with a clamping groove 51 for fixing an external antenna.

[0062] In the embodiment, the adhesive layer provides a reliable connection mode, which can tightly combine the flexible circuit board 31 and the top cover 50 together, and reduce the possibility of loosening or separating between the two during use of the battery cell 100 (such as under the condition of vibration, impact, etc.).

[0063] In the embodiment, the existence of the clamping groove 51 makes the installation process of the external antenna more convenient and accurate. When assembling the battery cell information acquisition module 30 and related components on the battery cell main body 10, the operator only needs to accurately insert the external antenna into the clamping groove 51 of the top cover 50 to complete the fixation of the external antenna. Compared with other possible fixation modes such as complex positioning, pasting or binding, this fixation mode greatly improves the accuracy and efficiency of assembly.

[0064] The utility model also provides a battery pack, including box body and a plurality of electric core, electric core is contained in the box body. Since the battery pack adopts all the technical schemes of the above-mentioned electric core all embodiments, therefore the battery pack of the utility model also has all the beneficial effects brought by the technical scheme of the above-mentioned embodiment at least, here will not repeat one by one.

[0065] The above embodiments of the utility model are only examples for clearly illustrating the utility model, and are not the limitation of the embodiments of the utility model. For ordinary skilled in the art, on the basis of the above description, other different forms of changes or variations can be made. Here cannot be exhausted to all the embodiments. Any change or variation derived from the technical scheme of the utility model still falls within the protection scope of the utility model.

Claims

1. An electric cell, characterized by, The battery cell comprises: a cell body; at least one pole post connected to the cell body; a cell information acquisition module connected to the at least one pole post; wherein the pole post comprises a first connecting portion connected to the cell body and a second connecting portion located on the side of the first connecting portion and connected to the first connecting portion, the first connecting portion is used for connecting external components, and the second connecting portion is used for connecting the cell information acquisition module.

2. The electric cell of claim 1, wherein, The first connecting portion and the second connecting portion have the same height.

3. The electric cell of claim 1, wherein, The second connecting portion is arranged around the circumferential side of the first connecting portion.

4. The electric cell of claim 1, wherein, The pole post is provided with two pole posts, which are arranged on the surface of the cell body, the first connecting portion of the two pole posts is connected with the external components, and the cell information acquisition module is located between the two pole posts and connected to the second connecting portion of the two pole posts.

5. The electric cell of any one of claims 1 to 4, wherein, The battery cell further comprises an explosion-proof valve, which is arranged on the side of the cell body where the cell information acquisition module is not installed.

6. The electric cell of any one of claims 1 to 4, wherein, The cell information acquisition module comprises a flexible circuit board, a temperature acquisition module, a voltage acquisition module, and an antenna module, the flexible circuit board is arranged on the surface of the cell body, the temperature acquisition module, the voltage acquisition module, and the antenna module are integrated on the side of the flexible circuit board away from the cell body, the antenna module is in communication connection with the temperature acquisition module and the voltage acquisition module, and is used for transmitting the collected signals.

7. The electric cell of claim 6, wherein, The cell information acquisition module further comprises a reinforcing plate, which is arranged on the side of the flexible circuit board facing the cell body.

8. The electric cell of claim 7, wherein, The battery cell further comprises a top cover, which is connected to the top of the cell body, the top cover is provided with a first through hole and a second through hole in the axial direction, the pole post passes through the first through hole and is connected to the cell body, the cell information acquisition module is arranged between the top cover and the cell body, and at least part of the cell information acquisition module is exposed to the second through hole.

9. The electric cell of claim 8, wherein, The battery cell further comprises an adhesive layer, one side of the adhesive layer is connected to the flexible circuit board, and the other side of the adhesive layer is connected to the top cover; and / or The surface of the top cover away from the cell body is provided with a clamping groove for fixing an external antenna.

10. A battery pack, characterized by, The battery cell comprises a box body and a plurality of battery cells as claimed in any one of claims 1 to 9, and the battery cells are accommodated in the box body.

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