CN220604932U

CN220604932U - Battery connection structure and battery module

Info

Publication number: CN220604932U
Application number: CN202322054344.8U
Authority: CN
Inventors: 王长凤; 贾晨晓; 李伟; 张健
Original assignee: Eve Energy Co Ltd
Current assignee: Eve Energy Co Ltd
Priority date: 2023-08-01
Filing date: 2023-08-01
Publication date: 2024-03-15
Anticipated expiration: 2033-08-01

Abstract

The utility model relates to a battery connecting structure and a battery module, wherein the battery connecting structure comprises a connecting sheet, one end of the connecting sheet is used for connecting a pole column of a battery cell, the end face of the battery cell, which is provided with the pole column, is a first end face, the other end of the connecting sheet extends out of the first end face, a test position for exposing part of the first end face is arranged on the connecting sheet, and the test position is used for fixed-point test of the axial expansion of the battery cell. According to the battery connecting structure, the test position is formed on the connecting sheet, so that external measuring equipment can test the axial expansion of the battery core through the test position, and the measurement is convenient at any time; and can realize that different operators or same operator still have the pointed fixed point measurement of different time, effectively promote the measurement accuracy of cell core expansion volume.

Description

Battery connection structure and battery module

Technical Field

The present utility model relates to the field of battery technologies, and in particular, to a battery connection structure and a battery module.

Background

With the development of electronic technology, battery modules are widely used. Generally, the battery module is composed of a plurality of single batteries, and the plurality of single batteries are connected by adopting a mode of welding a current collector after the positions of the single batteries are preset by the fixture. In order to ensure the product quality, an operator performs charge and discharge detection on the single battery or the battery module through the external detection equipment connecting current collector, and meanwhile, the expansion amount of the single battery needs to be measured, for example, the axial expansion amount of the cylindrical battery needs to be measured, so that the battery module reserves an expansion space with enough height for the expansion avoidance of the battery cell. The prior art has the following defects: the busbar is connected with the electric core and then completely covers the end face of the electric core, on which the polar posts are arranged, and an operator cannot measure the axial expansion of the electric core at any time.

Disclosure of Invention

One object of an embodiment of the utility model is to: the battery connecting structure is simple in structure and convenient to measure the expansion amount of the battery cells.

Another object of an embodiment of the utility model is to: the battery module is simple in structure and high in safety.

To achieve the purpose, the embodiment of the utility model adopts the following technical scheme:

the utility model provides a battery connection structure, including the connection piece, the one end of connection piece is used for connecting the utmost point post of electric core, the electric core is provided with the terminal surface of utmost point post is first terminal surface, the other end of connection piece extends first terminal surface, be provided with on the connection piece and be used for exposing some the test position of first terminal surface, the test position is used for the axial expansion volume fixed point test of electric core.

As a preferred scheme of the battery connecting structure, the length of the connecting sheet extends along a first direction, and at least two testing positions are arranged on the connecting sheet at intervals along the first direction.

As a preferable scheme of the battery connecting structure, the test position is a first hole, the distance between the hole wall of the first hole and the outer side face of the connecting sheet along the second direction is W, W is less than or equal to I/(T.A.B), wherein I is rated current of the battery cell, T is thickness of the connecting sheet, A is overcurrent capacity of unit area of the connecting sheet, B is redundancy coefficient, and 1.2 is more than or equal to B is more than or equal to 1.05.

As a preferable scheme of the battery connecting structure, the test position is an avoidance notch, the distance between the avoidance notch and the connecting piece along the second direction is W, W is less than or equal to I/(T is A is B), wherein I is the rated current of the battery cell, T is the thickness of the connecting piece, A is the overcurrent capacity of the unit area of the connecting piece, B is a redundancy coefficient, and 1.2 is more than or equal to B and is more than or equal to 1.05.

As a preferred embodiment of the battery connecting structure, the connecting piece is detachably connected to the pole.

As a preferred scheme of the battery connecting structure, at least one end, close to the pole, of the connecting sheet is provided with a clamping part, the periphery of the pole is provided with a clamping groove, and the clamping part is clamped in the clamping groove.

As a preferred scheme of the battery connecting structure, one of the clamping part and the pole is provided with a bolt, the other of the clamping part and the pole is provided with a positioning hole, and the bolt is inserted into the positioning hole.

As a preferred scheme of the battery connecting structure, the connecting piece is provided with a second hole at least close to one end of the pole, a first thread structure is arranged in the second hole, a second thread structure is arranged on the periphery of the pole, and the first thread structure is in threaded fit with the second thread structure.

As a preferred scheme of the battery connecting structure, one end of the connecting sheet, which is far away from the pole, is provided with a third hole, and the third hole is used for connecting external testing equipment.

In a second aspect, a battery module is provided, which includes at least two battery cells and the battery connection structure, where the battery cells are connected in series or in parallel through the battery connection structure.

The embodiment of the utility model has the beneficial effects that: the test position is arranged on the connecting sheet, so that external measurement equipment can test the axial expansion of the battery cell through the test position, and the measurement is convenient at any time; and can realize that different operators or same operator still have the pointed fixed point measurement of different time, effectively promote the measurement accuracy of cell core expansion volume.

Drawings

The utility model is described in further detail below with reference to the drawings and examples.

Fig. 1 is a schematic diagram illustrating a battery connection structure and a battery cell according to an embodiment of the present utility model.

Fig. 2 is a schematic structural diagram of a battery cell according to an embodiment of the utility model.

Fig. 3 is a schematic structural view of a battery connection structure according to an embodiment of the present utility model.

Fig. 4 is a schematic structural view of a battery connection structure according to another embodiment of the present utility model.

Fig. 5 is a schematic structural view of a battery connection structure according to still another embodiment of the present utility model.

In the figure:

1. a connecting sheet; 11. a test site; 12. a clamping part; 121. a fourth hole; 122. a mounting notch; 13. a plug pin; 14. a third hole; 2. a battery cell; 21. a pole; 211. a clamping groove; 212. positioning holes; 22. a first end face.

Detailed Description

In order to make the technical problems solved by the present utility model, the technical solutions adopted and the technical effects achieved more clear, the technical solutions of the embodiments of the present utility model will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to fall within the scope of the utility model.

In the description of the present utility model, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

As shown in fig. 1, the battery connection structure according to the embodiment of the utility model includes a connection piece 1, one end of the connection piece 1 is used for connecting a terminal post 21 of a battery core 2, the end surface of the battery core 2 provided with the terminal post 21 is a first end surface 22, the other end of the connection piece 1 extends out of the first end surface 22, a test site 11 for exposing a part of the first end surface 22 is provided on the connection piece 1, and the test site 11 is used for fixed-point testing of the axial expansion amount of the battery core 2. In this embodiment, the battery cell 2 is a cylindrical battery cell 2, and by providing the test site 11 on the connection piece 1, the external measurement device can test the axial expansion amount of the battery cell 2 through the test site 11, so that the measurement is convenient at any time, for example, the battery cell 2 is axially placed on the test platform, the external measurement device is connected with the battery cell 2 through the connection piece 1 to perform a charge and discharge test, and in the test process, an operator uses a measurement tool to pass through the test site 11 to measure the distance between the expanded first end face 22 and the test platform, so as to realize the measurement of the axial expansion of the battery cell 2 at any time, and the measurement is convenient; and can realize that different operators or same operator still have the pointed fixed point measurement of different time, effectively promote the measurement accuracy of electric core 2 axial expansion.

Optionally, as shown in fig. 1, the length of the connecting piece 1 extends along a first direction (the first direction is the X direction in fig. 1), and at least two test sites 11 are arranged on the connecting piece 1 at intervals along the X direction. In this embodiment, the radial direction of the cell 2 is the X direction, at least two test sites 11 are disposed on the connection piece 1, all the test sites 11 can be projected onto the first end surface 22 along the vertical direction (the vertical direction is the Z direction in fig. 1), and the arrangement of the test sites 11 can provide a plurality of test sites 11 on the radial direction of the cell 2, so as to accurately detect the expansion amounts at the positions of different radial dimensions.

Further, as shown in fig. 3, when the current abnormally input by the external test device is far greater than the bearing value of the battery core 2 in the process of the battery charge-discharge test, the battery core 2 and the external test device should be disconnected in time to protect the safety of the battery core 2, or the battery core 2 has internal short circuit or thermal runaway and other phenomena, and can generate the current far greater than the bearing value of the external test device, so as to avoid the damage of the external test device caused by the high current, and the connection between the battery core 2 and the external test should be disconnected in time. In this embodiment, the connection pad 1 can also serve as a fuse, i.e. the test site 11 is a first hole, the first hole is a through hole, the distance between the hole wall of the first hole and the outer side surface of the connection pad 1 along the second direction is W (the second direction is the Y direction in FIG. 1, FIG. 3 and FIG. 4), W is less than or equal to I/(T. Times. A. Times. B), wherein I is the rated current of the battery core 2, T is the thickness of the connection pad 1, A is the overcurrent capacity of the unit area of the connection pad 1, B is a redundancy factor, and 1.2 is more than or equal to B is more than or equal to 1.05 _。 Because the production and manufacture of the connecting sheet 1 have certain tolerance, and certain precision deviation of external test equipment generally causes current to fluctuate within a range of +/-2% of a set value, redundancy coefficients are 1.05, 1.06, 1.08, 1.10, 1.12, 1.14, 1.16, 1.18, 1.2 and the like, and excessive redundancy coefficients can cause abnormal current to cause the narrow side to be unable to be fused normally, so that the connecting sheet 1 cannot play a protective role, and excessive redundancy coefficients can cause insufficient overcurrent capacity of the connecting sheet 1, so that the external test equipment cannot test normally. For example, the rated current I of the battery cell 2 is 100A, and the thickness T of the connecting sheet 1 isThe overcurrent capacity of the unit area of the connecting sheet 1 is 5A/mm2, the redundancy coefficient B is 1.05, W is less than or equal to 100/(1 x 5 x 1.05) =19 mm, namely, the distance between the hole wall of the first hole of the connecting sheet 1 along the Y direction and the outer side surface is 19mm, and the distance is a safety size capable of allowing current to flow. When the current input by external test equipment exceeds the safety threshold, the connecting sheet 1 is fused at the hole wall of the first hole along the Y direction and the outer side surface of the connecting sheet 1, so that the external test equipment and the battery cell 2 are powered off, the test safety of the battery cell 2 is ensured, the connecting sheet 1 can serve as a fuse while the current-conducting sheet meets the required overcurrent capacity of the battery cell 2, and the safety is high.

Preferably, the external measuring device is typically an adjustable length clamp which, when the test site 11 is a first hole, is required to provide a projection towards the first end face 22 to be able to pass through the first hole to abut against the first end face 22. As shown in fig. 4, the test position 11 is an avoidance gap, through the arrangement of the avoidance gap, the fixture can test the axial expansion of the battery core 2 at the avoidance gap at a fixed point, and can directly pass through the avoidance gap to be abutted against the first end face 22, so that the abutment is stable, and the measurement stability is high. The distance between the avoidance gap and the connecting sheet 1 along the Y direction is W which is less than or equal to I/(T.A.B), wherein I is the rated current of the battery cell 2, T is the thickness of the connecting sheet 1, A is the overcurrent capacity of the unit area of the connecting sheet 1, B is the redundancy coefficient, and 1.2 is more than or equal to B is more than or equal to 1.05 _。 Because the production and manufacture of the connecting sheet 1 have certain tolerance, and certain precision deviation of external test equipment generally causes current to fluctuate within a range of +/-2% of a set value, redundancy coefficients are 1.05, 1.06, 1.08, 1.10, 1.12, 1.14, 1.16, 1.18, 1.2 and the like, and excessive redundancy coefficients can cause abnormal current to cause the narrow side to be unable to be fused normally, so that the connecting sheet 1 cannot play a protective role, and excessive redundancy coefficients can cause insufficient overcurrent capacity of the connecting sheet 1, so that the external test equipment cannot test normally.

Further, the connecting piece is made of one material or a composite material composed of at least two materials of nickel, aluminum and copper. The connecting piece has the advantages of simple structure, easy processing of parts, high material utilization rate and large heat dissipation area, and is suitable for high-current charge and discharge; and its heat conduction efficiency is higher, can guarantee battery steady operation to guarantee battery module's security.

In other embodiments, the terminal post 21 at least partially protrudes out of the end face of the axial arrangement of the shell of the battery core 2, the connecting sheet 1 is detachably connected with the terminal post 21, the connecting sheet 1 is connected with the terminal post 21 in a detachable mode, the installation and the detachment are convenient, the time and the labor are saved, the recycling rate of the connecting sheet 1 is improved, the investment of welding tools and welding equipment can be reduced, the cost is saved, and the operation efficiency is high.

Alternatively, as shown in fig. 1, 2 and 3, at least one end of the connecting piece 1, which is close to the pole 21, is provided with a clamping portion 12, and the periphery of the pole 21 is provided with a clamping groove 211, where the clamping portion 12 is clamped in the clamping groove 211. The specific structure of joint portion 12 is along Y direction interval and two arc structures that set up relatively, set up on the joint portion 12 promptly and set up the fourth hole 121 that runs through, the terminal surface that joint portion 12 is adjacent to utmost point post 21 is provided with the installation breach 122, installation breach 122 and fourth hole 121 intercommunication, the size of installation breach 122 along Y direction equals with the tank bottom diameter of joint groove 211, connection piece 1 is connected with utmost point post 21 through the form of joint, it is convenient to connect, it is convenient to dismantle, be favorable to the maintenance of connection piece 1 to change.

Further, as shown in fig. 2 and 3, the latch 13 is provided on the clamping portion 12, the positioning hole 212 is provided on the pole 21, and the latch 13 is inserted into the positioning hole 212. Through bolt 13 and locating hole 212 grafting, the joint portion 12 of being convenient for leads when being connected with utmost point post 21 on the one hand, on the other hand can effectively avoid connecting piece 1 and utmost point post 21 to take place the position deviation after being connected, guarantees the position accuracy of connection piece 1 to guarantee the position accuracy of test position 11, and then guarantee the position accuracy of electric core 2 axial expansion test position 11, effectively guarantee the test accuracy of electric core 2 axial expansion volume. Of course, instead of providing the plug 13 on the engaging portion 12, providing the positioning hole 212 on the pole 21, the plug 13 may be provided on the pole 21, and the positioning hole 212 may be provided on the plug 13.

Optionally, the connecting piece 1 is provided with the second hole near the one end of utmost point post 21 at least, is provided with first screw thread structure in the second hole, and the periphery of utmost point post 21 is provided with second screw thread structure, first screw thread structure and second screw thread structure screw-fit. The connecting piece 1 is connected with the pole column 21 in a threaded connection mode, and the connection is convenient and stable. In other embodiments, the terminal 21 completely covers the axial end face of the housing of the battery cell 2, i.e. the terminal 21 completely covers the first end face 22, the connecting piece 1 can be welded directly to the first end face 22, and the connecting piece 1 is attached to the first end face 22, so that the operator can measure the expansion of the exposed first end face 22 by the test site 11 on the connecting piece 1.

In this embodiment, as shown in fig. 1 and 3, the end of the connection piece 1 remote from the pole 21 is provided with a third hole 14, and the third hole 14 is used for connecting with external test equipment. The third hole 14 is a threaded hole, and a wire of the external test equipment penetrates through the third hole 14, and is screwed through the threaded hole through a bolt, so that the wire of the external test equipment is fixed with the connecting sheet 1, and the wire is firmly connected in a bolt connection mode, and the assembly and the disassembly are convenient.

The embodiment of the utility model also provides a battery module, as shown in fig. 5, which comprises at least two battery cells 2 and the battery connection structure of any embodiment, wherein the battery cells 2 are connected in series or in parallel through the battery connection structure. That is, the two ends of the battery connection structure are respectively connected with the lugs of the two battery cores 2, the test position 11 is arranged through the battery connection structure, the operation personnel can test the axial expansion of each battery core 2 of the battery module in real time, and meanwhile, the battery connection structure can act as a fuse, so that when the input current of external test equipment is overlarge, the external test equipment can be powered off in time, and the test safety of the battery module is effectively ensured.

In the description herein, it should be understood that the terms "upper," "lower," and the like are used for convenience in description and simplicity of operation only, and are not necessarily indicative or implying any particular orientation, configuration or operation of such apparatus or elements herein, and therefore should not be construed as limiting the present utility model.

In the description of the present specification, reference to the term "an embodiment" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment is included in at least one embodiment or example of the utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment.

Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in the foregoing embodiments, and that the embodiments described in the foregoing embodiments may be combined appropriately to form other embodiments that will be understood by those skilled in the art.

The technical principle of the present utility model is described above in connection with the specific embodiments. The description is made for the purpose of illustrating the general principles of the utility model and should not be taken in any way as limiting the scope of the utility model. Other embodiments of the utility model will be apparent to those skilled in the art from consideration of this specification without undue burden.

Claims

1. The battery connection structure is characterized by comprising a connection sheet, wherein one end of the connection sheet is used for being connected with a pole column of a battery cell, the battery cell is provided with a first end face on the end face of the pole column, the other end of the connection sheet extends out of the first end face, a test position for exposing part of the first end face is arranged on the connection sheet, and the test position is used for fixed-point test of axial expansion of the battery cell.

2. The battery connecting structure according to claim 1, wherein the length of the connecting piece extends in a first direction, and at least two of the test sites are provided on the connecting piece at intervals in the first direction.

3. The battery connection structure according to claim 2, wherein the test site is a first hole, a distance between a hole wall of the first hole and an outer side surface of the connection piece along a second direction is W, W is less than or equal to I/(t×a×b), wherein I is a rated current of the battery cell, T is a thickness of the connection piece, a is an overcurrent capacity per unit area of the connection piece, B is a redundancy factor, and 1.2 is greater than or equal to B is greater than or equal to 1.05.

4. The battery connection structure according to claim 2, wherein the test site is an avoidance notch, the distance between the avoidance notch and the connection piece along the second direction is W, W is less than or equal to I/(T is a is B), wherein I is the rated current of the battery cell, T is the thickness of the connection piece, a is the overcurrent capacity of the connection piece per unit area, and B is a redundancy factor, and 1.2 is greater than or equal to B is greater than or equal to 1.05.

5. The battery connecting structure according to any one of claims 1 to 4, wherein the connecting piece is detachably connected to the post.

6. The battery connecting structure according to claim 5, wherein the connecting piece is provided with a clamping portion at least adjacent to one end of the pole, a clamping groove is formed in the periphery of the pole, and the clamping portion is clamped in the clamping groove.

7. The battery connecting structure according to claim 6, wherein one of the clamping portion and the pole is provided with a plug, the other of the clamping portion and the pole is provided with a positioning hole, and the plug is inserted into the positioning hole.

8. The battery connecting structure according to claim 5, wherein the connecting piece is provided with a second hole at least near one end of the pole, a first screw structure is provided in the second hole, a second screw structure is provided at the outer periphery of the pole, and the first screw structure is screw-engaged with the second screw structure.

9. The battery connection structure according to any one of claims 1 to 4, wherein an end of the connection piece remote from the post is provided with a third hole for connection to an external test device.

10. A battery module comprising at least two cells and the battery connection structure according to any one of claims 1 to 9, the cells being connected in series or in parallel by the battery connection structure.