Lithium battery voltage-sharing jig

Abstract

The utility model relates to the technical field of lithium batteries, and particularly discloses a lithium battery voltage-sharing jig. The device comprises a base, the base is provided with a cavity for placing a plurality of battery cells, the cavity comprises a fixed plate and a movable top plate, the fixed plate is fixedly arranged on the base, and the movable top plate is movably arranged on the base; the clamping piece enables the movable top plate to abut against one side of the battery cell, so that the battery cell is clamped between the fixed plate and the movable top plate; an anode nickel strap and a cathode nickel strap are arranged on the inner wall of the cavity, the anodes of the plurality of battery cells are communicated through the anode nickel strap, and the cathodes of the plurality of battery cells are communicated through the cathode nickel strap. According to the utility model, the jig can be used for equalizing the voltage before the battery cells are assembled, and the voltage and the capacity of the whole group of single battery cells can reach a self-equalization state through the conduction of the nickel strap, so that the performance consistency and the cycle life of the battery cells can be improved and prolonged under the condition of no original factory data or need of echelon utilization, and meanwhile, the supplied material utilization rate of the battery cells is increased.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium batteries, and specifically discloses a lithium battery voltage equalizing fixture. Background Art

[0002] In modern power systems and energy storage devices, the consistency of battery cells is a key factor in ensuring the stable operation of the entire battery system. The consistency of battery cells mainly involves the consistency of parameters such as voltage, internal resistance, and tolerance. Differences in these parameters will directly affect the charge and discharge efficiency, cycle life, and overall performance of the battery. Therefore, achieving balanced control of battery cells is an important prerequisite for improving the comprehensive performance of the battery system, extending its service life, and ensuring safe operation.

[0003] To solve the problem of battery cell consistency, existing battery management system (BMS) technologies have been widely applied to the management of battery packs. Taking the patent 201680000651.8 as an example, this technology uses a dynamic equalizing circuit and method to equalize the voltage of an assembled battery pack, achieving voltage consistency among battery monomers. The BMS monitors the voltage of each monomer in the battery pack in real time and takes control measures to adjust the voltage difference, ensuring the stability and reliability of the battery pack performance.

[0004] However, existing BMS technologies mainly focus on the equalizing management after battery cells are grouped. This post-group self-equalizing method has certain limitations. First, equalizing is carried out only after the battery cells are assembled into a battery pack, which may not fully utilize the initial consistency of the battery cells, resulting in the battery cells not operating at their best state. Second, for battery cells without original factory data support or those that need to be utilized in a cascaded manner, it is difficult for existing technologies to achieve effective consistency management. In addition, post-group equalization may also lead to insufficient utilization rate of the incoming battery cells, affecting cost-effectiveness. Therefore, existing technologies have not provided an effective means to achieve self-equalization among monomers before battery cells are grouped, so as to optimize the initial consistency of battery cells and improve the efficiency and performance of the overall battery system. Summary of the Utility Model

[0005] The purpose of the utility model is to overcome the deficiencies of the existing technology and provide a lithium battery voltage equalizing fixture.

[0006] The utility model discloses a lithium battery voltage equalizing fixture, adopting the following technical solution:

[0007] A lithium battery voltage equalization fixture, comprising a base, on which a cavity for placing multiple battery cells is provided. The cavity includes a fixed plate and a movable top plate. The fixed plate is fixedly arranged on the base, and the movable top plate is movably arranged on the base. It further includes a clamping member that presses the movable top plate against one side of the battery cell, clamping the battery cell between the fixed plate and the movable top plate. The inner wall of the cavity is provided with a positive nickel strip and a negative nickel strip, and the positive electrodes of multiple battery cells are connected through the positive nickel strip, and the negative electrodes of multiple battery cells are connected through the negative nickel strip.

[0008] Preferably, the positive nickel strip and / or the negative nickel strip are detachably mounted on the inner wall of the cavity.

[0009] Preferably, the inner wall of the cavity is provided with nickel strip grooves, and magnets are arranged in the nickel strip grooves. The positive nickel strip and / or the negative nickel strip are mounted in the corresponding nickel strip grooves by magnetic attraction.

[0010] Preferably, the nickel strip grooves are arranged in multiple rows in the vertical direction.

[0011] Preferably, the clamping member is a quick clamp arranged on the base.

[0012] Preferably, the base is provided with a guide groove, the clamping member is provided with a moving seat, and the moving seat moves in the guide groove and is fixed to the base by a locking member.

[0013] Preferably, a plurality of springs are arranged at intervals on both the positive nickel strip and the negative nickel strip.

[0014] Preferably, the positive nickel strip and the negative nickel strip are arranged on the same side or opposite sides in the cavity.

[0015] Preferably, the fixed plate includes a rear fixed plate, a left fixed plate, and a right fixed plate, and the movable top plate is arranged opposite to the rear fixed plate.

[0016] Compared with the prior art, the present utility model has at least the following beneficial effects:

[0017] By setting a fixture with a fixed plate, a movable top plate, a clamping member, a positive nickel strip, and a negative nickel strip, the present utility model places multiple single battery cells side by side inside the fixed plate, and then moves and fixes the movable top plate to press against one side of the battery cell, so that the positive and negative electrodes of the battery cell are conducted through the positive nickel strip and the negative nickel strip. This voltage equalization using the fixture can be carried out before the battery cell assembly. Through the conduction of the nickel strip, the voltage and capacity of the whole group of single battery cells reach a self-balanced state, so that the performance consistency and cycle life of the battery cells can be improved without original factory data or when ladder utilization is required, and at the same time, the utilization rate of the incoming battery cells is increased. In addition, the design of the movable top plate and the clamping member not only facilitates the operator to take and place the battery cells, but also can adjust the width of the cavity according to the width of the battery cell, making the device suitable for voltage equalization of different sizes of battery cells. Description of the Drawings

[0018] Figure 1 This is a schematic diagram showing the placement of battery cells in the voltage equalizing fixture for lithium batteries of the present utility model;

[0019] Figure 2 This is a schematic structural diagram of the voltage equalizing fixture for lithium batteries of the present utility model.

[0020] Description of the Reference Numerals in the Drawings:

[0021] 1. Base; 2. Fixed plate; 21. Rear fixed plate; 22. Left fixed plate; 23. Right fixed plate; 3. Movable top plate; 4. Positive nickel strip; 5. Negative nickel strip; 6. Spring; 7. Nickel strip groove; 8. Magnet; 9. Clamping member; 10. Battery cell. Detailed Description of the Embodiment

[0022] In order to make the above objects, features, and advantages of the present utility model more obvious and understandable, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0023] This embodiment discloses a voltage equalizing fixture for lithium batteries. Referring to Figure 1-2 , it includes a base 1, a fixed plate 2 disposed on the base 1, and a movable top plate 3. The fixed plate 2 and the movable top plate 3 form a cavity for placing a plurality of battery cells 10. Among them, the fixed plate 2 is fixedly disposed on the base 1, and the movable top plate 3 is movably disposed on the base 1. A clamping member 9 is also provided on the base 1, and the movable top plate 3 is fixed to the base 1 through the clamping member 9. The inner wall of the cavity is provided with a positive nickel strip 4 and a negative nickel strip 5. The positive electrodes of the plurality of battery cells 10 are connected through the positive nickel strip 4, and the negative electrodes of the plurality of battery cells 10 are connected through the negative nickel strip 5.

[0024] By placing a plurality of single battery cells 10 side by side inside the fixed plate 2, and then moving the movable top plate 3 to abut against one side of the battery cells 10 and fixing it, the positive and negative electrodes of the plurality of battery cells 10 are respectively conducted through the positive nickel strip 4 and the negative nickel strip 5. In this way, before the battery cells are grouped, the voltage and capacity of the whole group of single battery cells reach a self-balanced state through the conduction of the nickel strip, and then the battery cells are assembled in groups. Especially in the case of no original data of the battery cells or in the aspect of secondary utilization, the consistency of the battery cell performance and the cycle life are effectively improved, and at the same time, the utilization rate of the incoming battery cells is also improved.

[0025] Specifically, the fixed plate 2 includes a rear fixed plate 21, a left fixed plate 22 and a right fixed plate 23, and the movable top plate 3 is arranged opposite to the rear fixed plate 21. The positive nickel strip 4 and the negative nickel strip 5 are arranged at intervals on the rear fixed plate 21 in the cavity. Of course, in other embodiments, the positive nickel strip 4 and the negative nickel strip 5 can also be arranged on the opposite side in the cavity. For example, one is arranged on the rear fixed plate 21 and the other is arranged on the movable top plate 3. A number of springs 6 are arranged at intervals on the positive nickel strip 4 and the negative nickel strip 5. The springs 6 serve as the contact points between the nickel strip and the battery. Each spring 6 corresponds to an electrode tab on the battery cell 10 respectively. The springs 6 can provide a certain pressure for the battery to ensure that the positive and negative electrodes of the battery are tightly connected to the contact points of the nickel strip, thereby ensuring the smooth flow of current.

[0026] In addition, the positive nickel strip 4 and the negative nickel strip 5 are preferably detachably installed on the inner wall of the cavity. In this embodiment, a nickel strip groove 7 is provided on the inner wall of the cavity, and a magnet 8 is arranged in the nickel strip groove 7. The positive nickel strip 4 and the negative nickel strip 5 are installed in the corresponding nickel strip grooves 7 by magnetic attraction. In this way, when the positions of the electrode tabs of different types of battery cells are different, the positive and negative nickel strips can be replaced so that the contact points on the positive and negative nickel strips match the electrode positions of the battery cell. As an alternative solution (not shown in the drawings), multiple rows of nickel strip grooves 7 are provided in the vertical direction, and a magnet 8 is correspondingly arranged in each nickel strip groove 7. In this way, according to the different height positions of the electrode tabs of the battery, the positive and negative nickel strips can be installed in the nickel strip grooves 7 at the corresponding heights, thereby further improving the adaptability and flexibility of the jig.

[0027] In this embodiment, the clamping member 9 can adopt a quick clamp. By pulling the wrench on the quick clamp, the ejector rod on the quick clamp can be abutted against the surface of the movable top plate, so as to realize the quick clamping function. In addition, as an alternative solution (not shown in the drawings), a guide groove is provided on the base 1, and the guide groove extends perpendicular to the surface of the rear fixed plate 21. The bottom of the quick clamp is provided with a moving seat, and the moving seat moves in the guide groove and is fixed to the base by a locking member. In this way, the quick clamp can move along the width direction of the battery cell, and can be clamped to match the battery cell models with larger widths, expanding the application range of the jig.

[0028] The technical solutions provided by the present invention have been introduced in detail above. Specific examples are used in this article to elaborate on the principles and implementation manners of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manners and application scopes. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. A lithium battery voltage equalizing fixture, comprising a base, characterized in that, The base is provided with a cavity for placing a plurality of battery cells. The cavity includes a fixed plate and a movable top plate. The fixed plate is fixedly arranged on the base, and the movable top plate is movably arranged on the base. It further includes a clamping member which abuts the movable top plate against one side of the battery cell, so that the battery cell is clamped between the fixed plate and the movable top plate. The inner wall of the cavity is provided with a positive nickel strip and a negative nickel strip. The positive electrodes of the plurality of battery cells are connected through the positive nickel strip, and the negative electrodes of the plurality of battery cells are connected through the negative nickel strip.

2. The lithium battery voltage equalization fixture according to claim 1, wherein The positive nickel strip and / or the negative nickel strip are detachably mounted on the inner wall of the cavity.

3. The lithium battery voltage equalization fixture according to claim 2, wherein, The inner wall of the cavity is provided with nickel strip grooves, and magnets are arranged in the nickel strip grooves. The positive nickel strip and / or the negative nickel strip are mounted into the corresponding nickel strip grooves by magnetic attraction.

4. The lithium battery voltage equalization fixture according to claim 3, characterized in that, The nickel strip grooves are arranged in multiple rows in the vertical direction.

5. The lithium battery voltage equalizing fixture according to claim 1, characterized in that, The clamping member is a quick clamp arranged on the base.

6. The lithium battery voltage equalization fixture according to claim 5, wherein The base is provided with a guide groove, and the clamping member is provided with a moving seat. The moving seat moves in the guide groove and is provided with a locking member to be fixed to the base.

7. The lithium battery voltage equalizing fixture according to any one of claims 1-6, characterized in that, A plurality of springs are arranged at intervals on both the positive nickel strip and the negative nickel strip.

8. The lithium battery voltage equalizing fixture according to any one of claims 1-6, characterized in that, The positive nickel strip and the negative nickel strip are arranged on the same side or opposite sides in the cavity.

9. The lithium battery voltage equalizing fixture according to any one of claims 1-6, characterized in that, The fixed plate includes a rear fixed plate, a left fixed plate and a right fixed plate, and the movable top plate is arranged opposite to the rear fixed plate.

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